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-rw-r--r--layout/painting/nsDisplayList.cpp8708
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diff --git a/layout/painting/nsDisplayList.cpp b/layout/painting/nsDisplayList.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * structures that represent things to be painted (ordered in z-order),
+ * used during painting and hit testing
+ */
+
+#include "nsDisplayList.h"
+
+#include <stdint.h>
+#include <algorithm>
+#include <limits>
+
+#include "gfxContext.h"
+#include "gfxUtils.h"
+#include "mozilla/DisplayPortUtils.h"
+#include "mozilla/Likely.h"
+#include "mozilla/dom/BrowserChild.h"
+#include "mozilla/dom/HTMLCanvasElement.h"
+#include "mozilla/dom/RemoteBrowser.h"
+#include "mozilla/dom/Selection.h"
+#include "mozilla/dom/ServiceWorkerRegistrar.h"
+#include "mozilla/dom/ServiceWorkerRegistration.h"
+#include "mozilla/dom/SVGElement.h"
+#include "mozilla/dom/TouchEvent.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/ShapeUtils.h"
+#include "mozilla/StaticPrefs_apz.h"
+#include "mozilla/StaticPrefs_gfx.h"
+#include "mozilla/StaticPrefs_layers.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_print.h"
+#include "mozilla/SVGIntegrationUtils.h"
+#include "mozilla/SVGUtils.h"
+#include "mozilla/ViewportUtils.h"
+#include "nsCSSRendering.h"
+#include "nsCSSRenderingGradients.h"
+#include "nsRefreshDriver.h"
+#include "nsRegion.h"
+#include "nsStyleStructInlines.h"
+#include "nsStyleTransformMatrix.h"
+#include "nsTransitionManager.h"
+#include "gfxMatrix.h"
+#include "nsLayoutUtils.h"
+#include "nsIScrollableFrame.h"
+#include "nsIFrameInlines.h"
+#include "nsStyleConsts.h"
+#include "BorderConsts.h"
+#include "mozilla/MathAlgorithms.h"
+
+#include "imgIContainer.h"
+#include "nsImageFrame.h"
+#include "nsSubDocumentFrame.h"
+#include "nsViewManager.h"
+#include "ImageContainer.h"
+#include "nsCanvasFrame.h"
+#include "nsSubDocumentFrame.h"
+#include "StickyScrollContainer.h"
+#include "mozilla/AnimationPerformanceWarning.h"
+#include "mozilla/AnimationUtils.h"
+#include "mozilla/AutoRestore.h"
+#include "mozilla/EffectCompositor.h"
+#include "mozilla/EffectSet.h"
+#include "mozilla/HashTable.h"
+#include "mozilla/LookAndFeel.h"
+#include "mozilla/OperatorNewExtensions.h"
+#include "mozilla/PendingAnimationTracker.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/ProfilerMarkers.h"
+#include "mozilla/StyleAnimationValue.h"
+#include "mozilla/ServoBindings.h"
+#include "mozilla/SVGClipPathFrame.h"
+#include "mozilla/SVGMaskFrame.h"
+#include "mozilla/SVGObserverUtils.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "mozilla/ViewportFrame.h"
+#include "mozilla/gfx/gfxVars.h"
+#include "ActiveLayerTracker.h"
+#include "nsEscape.h"
+#include "nsPrintfCString.h"
+#include "UnitTransforms.h"
+#include "LayerAnimationInfo.h"
+#include "mozilla/EventStateManager.h"
+#include "nsCaret.h"
+#include "nsDOMTokenList.h"
+#include "nsCSSProps.h"
+#include "nsTableCellFrame.h"
+#include "nsTableColFrame.h"
+#include "nsTextFrame.h"
+#include "nsTextPaintStyle.h"
+#include "nsSliderFrame.h"
+#include "nsFocusManager.h"
+#include "TextDrawTarget.h"
+#include "mozilla/layers/AnimationHelper.h"
+#include "mozilla/layers/CompositorThread.h"
+#include "mozilla/layers/InputAPZContext.h"
+#include "mozilla/layers/RenderRootStateManager.h"
+#include "mozilla/layers/StackingContextHelper.h"
+#include "mozilla/layers/TreeTraversal.h"
+#include "mozilla/layers/WebRenderBridgeChild.h"
+#include "mozilla/layers/WebRenderLayerManager.h"
+#include "mozilla/layers/WebRenderMessages.h"
+#include "mozilla/layers/WebRenderScrollData.h"
+
+namespace mozilla {
+
+using namespace dom;
+using namespace gfx;
+using namespace layout;
+using namespace layers;
+using namespace image;
+
+LazyLogModule sContentDisplayListLog("dl.content");
+LazyLogModule sParentDisplayListLog("dl.parent");
+
+LazyLogModule& GetLoggerByProcess() {
+ return XRE_IsContentProcess() ? sContentDisplayListLog
+ : sParentDisplayListLog;
+}
+
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+void AssertUniqueItem(nsDisplayItem* aItem) {
+ for (nsDisplayItem* i : aItem->Frame()->DisplayItems()) {
+ if (i != aItem && !i->HasDeletedFrame() && i->Frame() == aItem->Frame() &&
+ i->GetPerFrameKey() == aItem->GetPerFrameKey()) {
+ if (i->IsPreProcessedItem() || i->IsPreProcessed()) {
+ continue;
+ }
+ MOZ_DIAGNOSTIC_ASSERT(false, "Duplicate display item!");
+ }
+ }
+}
+#endif
+
+bool ShouldBuildItemForEvents(const DisplayItemType aType) {
+ return aType == DisplayItemType::TYPE_COMPOSITOR_HITTEST_INFO ||
+ (GetDisplayItemFlagsForType(aType) & TYPE_IS_CONTAINER);
+}
+
+static bool ItemTypeSupportsHitTesting(const DisplayItemType aType) {
+ switch (aType) {
+ case DisplayItemType::TYPE_BACKGROUND:
+ case DisplayItemType::TYPE_BACKGROUND_COLOR:
+ case DisplayItemType::TYPE_THEMED_BACKGROUND:
+ return true;
+ default:
+ return false;
+ }
+}
+
+void InitializeHitTestInfo(nsDisplayListBuilder* aBuilder,
+ nsPaintedDisplayItem* aItem,
+ const DisplayItemType aType) {
+ if (ItemTypeSupportsHitTesting(aType)) {
+ aItem->InitializeHitTestInfo(aBuilder);
+ }
+}
+
+/* static */
+already_AddRefed<ActiveScrolledRoot> ActiveScrolledRoot::CreateASRForFrame(
+ const ActiveScrolledRoot* aParent, nsIScrollableFrame* aScrollableFrame,
+ bool aIsRetained) {
+ nsIFrame* f = do_QueryFrame(aScrollableFrame);
+
+ RefPtr<ActiveScrolledRoot> asr;
+ if (aIsRetained) {
+ asr = f->GetProperty(ActiveScrolledRootCache());
+ }
+
+ if (!asr) {
+ asr = new ActiveScrolledRoot();
+
+ if (aIsRetained) {
+ RefPtr<ActiveScrolledRoot> ref = asr;
+ f->SetProperty(ActiveScrolledRootCache(), ref.forget().take());
+ }
+ }
+ asr->mParent = aParent;
+ asr->mScrollableFrame = aScrollableFrame;
+ asr->mViewId = Nothing();
+ asr->mDepth = aParent ? aParent->mDepth + 1 : 1;
+ asr->mRetained = aIsRetained;
+
+ return asr.forget();
+}
+
+/* static */
+bool ActiveScrolledRoot::IsAncestor(const ActiveScrolledRoot* aAncestor,
+ const ActiveScrolledRoot* aDescendant) {
+ if (!aAncestor) {
+ // nullptr is the root
+ return true;
+ }
+ if (Depth(aAncestor) > Depth(aDescendant)) {
+ return false;
+ }
+ const ActiveScrolledRoot* asr = aDescendant;
+ while (asr) {
+ if (asr == aAncestor) {
+ return true;
+ }
+ asr = asr->mParent;
+ }
+ return false;
+}
+
+/* static */
+bool ActiveScrolledRoot::IsProperAncestor(
+ const ActiveScrolledRoot* aAncestor,
+ const ActiveScrolledRoot* aDescendant) {
+ return aAncestor != aDescendant && IsAncestor(aAncestor, aDescendant);
+}
+
+/* static */
+nsCString ActiveScrolledRoot::ToString(
+ const ActiveScrolledRoot* aActiveScrolledRoot) {
+ nsAutoCString str;
+ for (const auto* asr = aActiveScrolledRoot; asr; asr = asr->mParent) {
+ str.AppendPrintf("<0x%p>", asr->mScrollableFrame);
+ if (asr->mParent) {
+ str.AppendLiteral(", ");
+ }
+ }
+ return std::move(str);
+}
+
+ScrollableLayerGuid::ViewID ActiveScrolledRoot::ComputeViewId() const {
+ nsIContent* content = mScrollableFrame->GetScrolledFrame()->GetContent();
+ return nsLayoutUtils::FindOrCreateIDFor(content);
+}
+
+ActiveScrolledRoot::~ActiveScrolledRoot() {
+ if (mScrollableFrame && mRetained) {
+ nsIFrame* f = do_QueryFrame(mScrollableFrame);
+ f->RemoveProperty(ActiveScrolledRootCache());
+ }
+}
+
+static uint64_t AddAnimationsForWebRender(
+ nsDisplayItem* aItem, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder,
+ const Maybe<LayoutDevicePoint>& aPosition = Nothing()) {
+ auto* effects = EffectSet::GetForFrame(aItem->Frame(), aItem->GetType());
+ if (!effects || effects->IsEmpty()) {
+ // If there is no animation on the nsIFrame, that means
+ // 1) we've never created any animations on this frame or
+ // 2) the frame was reconstruced or
+ // 3) all animations on the frame have finished
+ // in such cases we don't need do anything here.
+ //
+ // Even if there is a WebRenderAnimationData for the display item type on
+ // this frame, it's going to be discarded since it's not marked as being
+ // used.
+ return 0;
+ }
+
+ RefPtr<WebRenderAnimationData> animationData =
+ aManager->CommandBuilder()
+ .CreateOrRecycleWebRenderUserData<WebRenderAnimationData>(aItem);
+ AnimationInfo& animationInfo = animationData->GetAnimationInfo();
+ animationInfo.AddAnimationsForDisplayItem(
+ aItem->Frame(), aDisplayListBuilder, aItem, aItem->GetType(),
+ aManager->LayerManager(), aPosition);
+ animationInfo.StartPendingAnimations(
+ aManager->LayerManager()->GetAnimationReadyTime());
+
+ // Note that animationsId can be 0 (uninitialized in AnimationInfo) if there
+ // are no active animations.
+ uint64_t animationsId = animationInfo.GetCompositorAnimationsId();
+ if (!animationInfo.GetAnimations().IsEmpty()) {
+ OpAddCompositorAnimations anim(
+ CompositorAnimations(animationInfo.GetAnimations(), animationsId));
+ aManager->WrBridge()->AddWebRenderParentCommand(anim);
+ aManager->AddActiveCompositorAnimationId(animationsId);
+ } else if (animationsId) {
+ aManager->AddCompositorAnimationsIdForDiscard(animationsId);
+ animationsId = 0;
+ }
+
+ return animationsId;
+}
+
+static bool GenerateAndPushTextMask(nsIFrame* aFrame, gfxContext* aContext,
+ const nsRect& aFillRect,
+ nsDisplayListBuilder* aBuilder) {
+ if (aBuilder->IsForGenerateGlyphMask()) {
+ return false;
+ }
+
+ SVGObserverUtils::GetAndObserveBackgroundClip(aFrame);
+
+ // The main function of enabling background-clip:text property value.
+ // When a nsDisplayBackgroundImage detects "text" bg-clip style, it will call
+ // this function to
+ // 1. Generate a mask by all descendant text frames
+ // 2. Push the generated mask into aContext.
+
+ gfxContext* sourceCtx = aContext;
+ LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
+ aFillRect, aFrame->PresContext()->AppUnitsPerDevPixel());
+
+ // Create a mask surface.
+ RefPtr<DrawTarget> sourceTarget = sourceCtx->GetDrawTarget();
+ RefPtr<DrawTarget> maskDT = sourceTarget->CreateClippedDrawTarget(
+ bounds.ToUnknownRect(), SurfaceFormat::A8);
+ if (!maskDT || !maskDT->IsValid()) {
+ return false;
+ }
+ gfxContext maskCtx(maskDT, /* aPreserveTransform */ true);
+ maskCtx.Multiply(Matrix::Translation(bounds.TopLeft().ToUnknownPoint()));
+
+ // Shade text shape into mask A8 surface.
+ nsLayoutUtils::PaintFrame(
+ &maskCtx, aFrame, nsRect(nsPoint(0, 0), aFrame->GetSize()),
+ NS_RGB(255, 255, 255), nsDisplayListBuilderMode::GenerateGlyph);
+
+ // Push the generated mask into aContext, so that the caller can pop and
+ // blend with it.
+
+ Matrix currentMatrix = sourceCtx->CurrentMatrix();
+ Matrix invCurrentMatrix = currentMatrix;
+ invCurrentMatrix.Invert();
+
+ RefPtr<SourceSurface> maskSurface = maskDT->Snapshot();
+ sourceCtx->PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, 1.0,
+ maskSurface, invCurrentMatrix);
+
+ return true;
+}
+
+nsDisplayWrapper* nsDisplayWrapList::CreateShallowCopy(
+ nsDisplayListBuilder* aBuilder) {
+ const nsDisplayWrapList* wrappedItem = AsDisplayWrapList();
+ MOZ_ASSERT(wrappedItem);
+
+ // Create a new nsDisplayWrapList using a copy-constructor. This is done
+ // to preserve the information about bounds.
+ nsDisplayWrapper* wrapper =
+ new (aBuilder) nsDisplayWrapper(aBuilder, *wrappedItem);
+ wrapper->SetType(nsDisplayWrapper::ItemType());
+ MOZ_ASSERT(wrapper);
+
+ // Set the display list pointer of the new wrapper item to the display list
+ // of the wrapped item.
+ wrapper->mListPtr = wrappedItem->mListPtr;
+ return wrapper;
+}
+
+nsDisplayWrapList* nsDisplayListBuilder::MergeItems(
+ nsTArray<nsDisplayItem*>& aItems) {
+ // For merging, we create a temporary item by cloning the last item of the
+ // mergeable items list. This ensures that the temporary item will have the
+ // correct frame and bounds.
+ nsDisplayWrapList* last = aItems.PopLastElement()->AsDisplayWrapList();
+ MOZ_ASSERT(last);
+ nsDisplayWrapList* merged = last->Clone(this);
+ MOZ_ASSERT(merged);
+ AddTemporaryItem(merged);
+
+ // Create nsDisplayWrappers that point to the internal display lists of the
+ // items we are merging. These nsDisplayWrappers are added to the display list
+ // of the temporary item.
+ for (nsDisplayItem* item : aItems) {
+ MOZ_ASSERT(item);
+ MOZ_ASSERT(merged->CanMerge(item));
+ merged->Merge(item);
+ MOZ_ASSERT(item->AsDisplayWrapList());
+ merged->GetChildren()->AppendToTop(
+ static_cast<nsDisplayWrapList*>(item)->CreateShallowCopy(this));
+ }
+
+ merged->GetChildren()->AppendToTop(last->CreateShallowCopy(this));
+
+ return merged;
+}
+
+void nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter::
+ SetCurrentActiveScrolledRoot(
+ const ActiveScrolledRoot* aActiveScrolledRoot) {
+ MOZ_ASSERT(!mUsed);
+
+ // Set the builder's mCurrentActiveScrolledRoot.
+ mBuilder->mCurrentActiveScrolledRoot = aActiveScrolledRoot;
+
+ // We also need to adjust the builder's mCurrentContainerASR.
+ // mCurrentContainerASR needs to be an ASR that all the container's
+ // contents have finite bounds with respect to. If aActiveScrolledRoot
+ // is an ancestor ASR of mCurrentContainerASR, that means we need to
+ // set mCurrentContainerASR to aActiveScrolledRoot, because otherwise
+ // the items that will be created with aActiveScrolledRoot wouldn't
+ // have finite bounds with respect to mCurrentContainerASR. There's one
+ // exception, in the case where there's a content clip on the builder
+ // that is scrolled by a descendant ASR of aActiveScrolledRoot. This
+ // content clip will clip all items that are created while this
+ // AutoCurrentActiveScrolledRootSetter exists. This means that the items
+ // created during our lifetime will have finite bounds with respect to
+ // the content clip's ASR, even if the items' actual ASR is an ancestor
+ // of that. And it also means that mCurrentContainerASR only needs to be
+ // set to the content clip's ASR and not all the way to aActiveScrolledRoot.
+ // This case is tested by fixed-pos-scrolled-clip-opacity-layerize.html
+ // and fixed-pos-scrolled-clip-opacity-inside-layerize.html.
+
+ // finiteBoundsASR is the leafmost ASR that all items created during
+ // object's lifetime have finite bounds with respect to.
+ const ActiveScrolledRoot* finiteBoundsASR =
+ ActiveScrolledRoot::PickDescendant(mContentClipASR, aActiveScrolledRoot);
+
+ // mCurrentContainerASR is adjusted so that it's still an ancestor of
+ // finiteBoundsASR.
+ mBuilder->mCurrentContainerASR = ActiveScrolledRoot::PickAncestor(
+ mBuilder->mCurrentContainerASR, finiteBoundsASR);
+
+ // If we are entering out-of-flow content inside a CSS filter, mark
+ // scroll frames wrt. which the content is fixed as containing such content.
+ if (mBuilder->mFilterASR && ActiveScrolledRoot::IsAncestor(
+ aActiveScrolledRoot, mBuilder->mFilterASR)) {
+ for (const ActiveScrolledRoot* asr = mBuilder->mFilterASR;
+ asr && asr != aActiveScrolledRoot; asr = asr->mParent) {
+ asr->mScrollableFrame->SetHasOutOfFlowContentInsideFilter();
+ }
+ }
+
+ mUsed = true;
+}
+
+void nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter::
+ InsertScrollFrame(nsIScrollableFrame* aScrollableFrame) {
+ MOZ_ASSERT(!mUsed);
+ size_t descendantsEndIndex = mBuilder->mActiveScrolledRoots.Length();
+ const ActiveScrolledRoot* parentASR = mBuilder->mCurrentActiveScrolledRoot;
+ const ActiveScrolledRoot* asr =
+ mBuilder->AllocateActiveScrolledRoot(parentASR, aScrollableFrame);
+ mBuilder->mCurrentActiveScrolledRoot = asr;
+
+ // All child ASRs of parentASR that were created while this
+ // AutoCurrentActiveScrolledRootSetter object was on the stack belong to us
+ // now. Reparent them to asr.
+ for (size_t i = mDescendantsStartIndex; i < descendantsEndIndex; i++) {
+ ActiveScrolledRoot* descendantASR = mBuilder->mActiveScrolledRoots[i];
+ if (ActiveScrolledRoot::IsAncestor(parentASR, descendantASR)) {
+ descendantASR->IncrementDepth();
+ if (descendantASR->mParent == parentASR) {
+ descendantASR->mParent = asr;
+ }
+ }
+ }
+
+ mUsed = true;
+}
+
+nsDisplayListBuilder::AutoContainerASRTracker::AutoContainerASRTracker(
+ nsDisplayListBuilder* aBuilder)
+ : mBuilder(aBuilder), mSavedContainerASR(aBuilder->mCurrentContainerASR) {
+ mBuilder->mCurrentContainerASR = mBuilder->mCurrentActiveScrolledRoot;
+}
+
+nsPresContext* nsDisplayListBuilder::CurrentPresContext() {
+ return CurrentPresShellState()->mPresShell->GetPresContext();
+}
+
+/* static */
+nsRect nsDisplayListBuilder::OutOfFlowDisplayData::ComputeVisibleRectForFrame(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ const nsRect& aVisibleRect, const nsRect& aDirtyRect,
+ nsRect* aOutDirtyRect) {
+ nsRect visible = aVisibleRect;
+ nsRect dirtyRectRelativeToDirtyFrame = aDirtyRect;
+
+ bool inPartialUpdate =
+ aBuilder->IsRetainingDisplayList() && aBuilder->IsPartialUpdate();
+ if (StaticPrefs::apz_allow_zooming() &&
+ DisplayPortUtils::IsFixedPosFrameInDisplayPort(aFrame) &&
+ aBuilder->IsPaintingToWindow() && !inPartialUpdate) {
+ dirtyRectRelativeToDirtyFrame =
+ nsRect(nsPoint(0, 0), aFrame->GetParent()->GetSize());
+
+ // If there's a visual viewport size set, restrict the amount of the
+ // fixed-position element we paint to the visual viewport. (In general
+ // the fixed-position element can be as large as the layout viewport,
+ // which at a high zoom level can cause us to paint too large of an
+ // area.)
+ PresShell* presShell = aFrame->PresShell();
+ if (presShell->IsVisualViewportSizeSet()) {
+ dirtyRectRelativeToDirtyFrame =
+ nsRect(presShell->GetVisualViewportOffsetRelativeToLayoutViewport(),
+ presShell->GetVisualViewportSize());
+ // But if we have a displayport, expand it to the displayport, so
+ // that async-scrolling the visual viewport within the layout viewport
+ // will not checkerboard.
+ if (nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame()) {
+ nsRect displayport;
+ // Note that the displayport here is already in the right coordinate
+ // space: it's relative to the scroll port (= layout viewport), but
+ // covers the visual viewport with some margins around it, which is
+ // exactly what we want.
+ if (DisplayPortUtils::GetDisplayPort(
+ rootScrollFrame->GetContent(), &displayport,
+ DisplayPortOptions().With(ContentGeometryType::Fixed))) {
+ dirtyRectRelativeToDirtyFrame = displayport;
+ }
+ }
+ }
+ visible = dirtyRectRelativeToDirtyFrame;
+ if (StaticPrefs::apz_test_logging_enabled() &&
+ presShell->GetDocument()->IsContentDocument()) {
+ nsLayoutUtils::LogAdditionalTestData(
+ aBuilder, "fixedPosDisplayport",
+ ToString(CSSSize::FromAppUnits(visible)));
+ }
+ }
+
+ *aOutDirtyRect = dirtyRectRelativeToDirtyFrame - aFrame->GetPosition();
+ visible -= aFrame->GetPosition();
+
+ nsRect overflowRect = aFrame->InkOverflowRect();
+
+ if (aFrame->IsTransformed() && EffectCompositor::HasAnimationsForCompositor(
+ aFrame, DisplayItemType::TYPE_TRANSFORM)) {
+ /**
+ * Add a fuzz factor to the overflow rectangle so that elements only
+ * just out of view are pulled into the display list, so they can be
+ * prerendered if necessary.
+ */
+ overflowRect.Inflate(nsPresContext::CSSPixelsToAppUnits(32));
+ }
+
+ visible.IntersectRect(visible, overflowRect);
+ aOutDirtyRect->IntersectRect(*aOutDirtyRect, overflowRect);
+
+ return visible;
+}
+
+nsDisplayListBuilder::Linkifier::Linkifier(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame,
+ nsDisplayList* aList)
+ : mList(aList) {
+ // Find the element that we need to check for link-ness, bailing out if
+ // we can't find one.
+ Element* elem = Element::FromNodeOrNull(aFrame->GetContent());
+ if (!elem) {
+ return;
+ }
+
+ // If the element has an id and/or name attribute, generate a destination
+ // for possible internal linking.
+ auto maybeGenerateDest = [&](const nsAtom* aAttr) {
+ nsAutoString attrValue;
+ elem->GetAttr(aAttr, attrValue);
+ if (!attrValue.IsEmpty()) {
+ NS_ConvertUTF16toUTF8 dest(attrValue);
+ // Ensure that we only emit a given destination once, although there may
+ // be multiple frames associated with a given element; we'll simply use
+ // the first of them as the target of any links to it.
+ // XXX(jfkthame) This prevents emitting duplicate destinations *on the
+ // same page*, but does not prevent duplicates on subsequent pages, as
+ // each new page is handled by a new temporary DisplayListBuilder. This
+ // seems to be harmless in practice, though a bit wasteful of space. To
+ // fix, we need to maintain the set of already-seen destinations globally
+ // for the print job, rather than attached to the (per-page) builder.
+ if (aBuilder->mDestinations.EnsureInserted(dest)) {
+ auto* destination = MakeDisplayItem<nsDisplayDestination>(
+ aBuilder, aFrame, dest.get(), aFrame->GetRect().TopLeft());
+ mList->AppendToTop(destination);
+ }
+ }
+ };
+
+ if (StaticPrefs::print_save_as_pdf_internal_destinations_enabled()) {
+ if (elem->HasID()) {
+ maybeGenerateDest(nsGkAtoms::id);
+ }
+ if (elem->HasName()) {
+ maybeGenerateDest(nsGkAtoms::name);
+ }
+ }
+
+ // Links don't nest, so if the builder already has a destination, no need to
+ // check for a link element here.
+ if (!aBuilder->mLinkSpec.IsEmpty()) {
+ return;
+ }
+
+ // Check if we have actually found a link.
+ if (!elem->IsLink()) {
+ return;
+ }
+
+ nsCOMPtr<nsIURI> uri = elem->GetHrefURI();
+ if (!uri) {
+ return;
+ }
+
+ // Is it a local (in-page) destination?
+ bool hasRef, eqExRef;
+ nsIURI* docURI;
+ if (StaticPrefs::print_save_as_pdf_internal_destinations_enabled() &&
+ NS_SUCCEEDED(uri->GetHasRef(&hasRef)) && hasRef &&
+ (docURI = aFrame->PresContext()->Document()->GetDocumentURI()) &&
+ NS_SUCCEEDED(uri->EqualsExceptRef(docURI, &eqExRef)) && eqExRef) {
+ if (NS_FAILED(uri->GetRef(aBuilder->mLinkSpec)) ||
+ aBuilder->mLinkSpec.IsEmpty()) {
+ return;
+ }
+ // The destination name is simply a string; we don't want URL-escaping
+ // applied to it.
+ NS_UnescapeURL(aBuilder->mLinkSpec);
+ // Mark the link spec as being an internal destination
+ aBuilder->mLinkSpec.Insert('#', 0);
+ } else {
+ if (NS_FAILED(uri->GetSpec(aBuilder->mLinkSpec)) ||
+ aBuilder->mLinkSpec.IsEmpty()) {
+ return;
+ }
+ }
+
+ // Record that we need to reset the builder's state on destruction.
+ mBuilderToReset = aBuilder;
+}
+
+void nsDisplayListBuilder::Linkifier::MaybeAppendLink(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) {
+ // Note that we may generate a link here even if the constructor bailed out
+ // without updating aBuilder->LinkSpec(), because it may have been set by
+ // an ancestor that was associated with a link element.
+ if (!aBuilder->mLinkSpec.IsEmpty()) {
+ auto* link = MakeDisplayItem<nsDisplayLink>(
+ aBuilder, aFrame, aBuilder->mLinkSpec.get(), aFrame->GetRect());
+ mList->AppendToTop(link);
+ }
+}
+
+uint32_t nsDisplayListBuilder::sPaintSequenceNumber(1);
+
+nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame,
+ nsDisplayListBuilderMode aMode,
+ bool aBuildCaret,
+ bool aRetainingDisplayList)
+ : mReferenceFrame(aReferenceFrame),
+ mIgnoreScrollFrame(nullptr),
+ mCurrentActiveScrolledRoot(nullptr),
+ mCurrentContainerASR(nullptr),
+ mCurrentFrame(aReferenceFrame),
+ mCurrentReferenceFrame(aReferenceFrame),
+ mGlassDisplayItem(nullptr),
+ mCaretFrame(nullptr),
+ mScrollInfoItemsForHoisting(nullptr),
+ mFirstClipChainToDestroy(nullptr),
+ mTableBackgroundSet(nullptr),
+ mCurrentScrollParentId(ScrollableLayerGuid::NULL_SCROLL_ID),
+ mCurrentScrollbarTarget(ScrollableLayerGuid::NULL_SCROLL_ID),
+ mFilterASR(nullptr),
+ mDirtyRect(-1, -1, -1, -1),
+ mBuildingExtraPagesForPageNum(0),
+ mHasGlassItemDuringPartial(false),
+ mMode(aMode),
+ mContainsBlendMode(false),
+ mIsBuildingScrollbar(false),
+ mCurrentScrollbarWillHaveLayer(false),
+ mBuildCaret(aBuildCaret),
+ mRetainingDisplayList(aRetainingDisplayList),
+ mPartialUpdate(false),
+ mIgnoreSuppression(false),
+ mIncludeAllOutOfFlows(false),
+ mDescendIntoSubdocuments(true),
+ mSelectedFramesOnly(false),
+ mAllowMergingAndFlattening(true),
+ mInTransform(false),
+ mInEventsOnly(false),
+ mInFilter(false),
+ mInPageSequence(false),
+ mIsInChromePresContext(false),
+ mSyncDecodeImages(false),
+ mIsPaintingToWindow(false),
+ mUseHighQualityScaling(false),
+ mIsPaintingForWebRender(false),
+ mIsCompositingCheap(false),
+ mAncestorHasApzAwareEventHandler(false),
+ mHaveScrollableDisplayPort(false),
+ mWindowDraggingAllowed(false),
+ mIsBuildingForPopup(nsLayoutUtils::IsPopup(aReferenceFrame)),
+ mForceLayerForScrollParent(false),
+ mContainsNonMinimalDisplayPort(false),
+ mAsyncPanZoomEnabled(nsLayoutUtils::AsyncPanZoomEnabled(aReferenceFrame)),
+ mBuildingInvisibleItems(false),
+ mIsBuilding(false),
+ mInInvalidSubtree(false),
+ mDisablePartialUpdates(false),
+ mPartialBuildFailed(false),
+ mIsInActiveDocShell(false),
+ mBuildAsyncZoomContainer(false),
+ mIsRelativeToLayoutViewport(false),
+ mUseOverlayScrollbars(false),
+ mAlwaysLayerizeScrollbars(false) {
+ MOZ_COUNT_CTOR(nsDisplayListBuilder);
+
+ mBuildCompositorHitTestInfo = mAsyncPanZoomEnabled && IsForPainting();
+
+ ShouldRebuildDisplayListDueToPrefChange();
+
+ mUseOverlayScrollbars =
+ !!LookAndFeel::GetInt(LookAndFeel::IntID::UseOverlayScrollbars);
+
+ mAlwaysLayerizeScrollbars =
+ StaticPrefs::layout_scrollbars_always_layerize_track();
+
+ static_assert(
+ static_cast<uint32_t>(DisplayItemType::TYPE_MAX) < (1 << TYPE_BITS),
+ "Check TYPE_MAX should not overflow");
+
+ mIsReusingStackingContextItems =
+ mRetainingDisplayList && StaticPrefs::layout_display_list_retain_sc();
+}
+
+static PresShell* GetFocusedPresShell() {
+ nsPIDOMWindowOuter* focusedWnd =
+ nsFocusManager::GetFocusManager()->GetFocusedWindow();
+ if (!focusedWnd) {
+ return nullptr;
+ }
+
+ nsCOMPtr<nsIDocShell> focusedDocShell = focusedWnd->GetDocShell();
+ if (!focusedDocShell) {
+ return nullptr;
+ }
+
+ return focusedDocShell->GetPresShell();
+}
+
+void nsDisplayListBuilder::BeginFrame() {
+ nsCSSRendering::BeginFrameTreesLocked();
+
+ mIsPaintingToWindow = false;
+ mUseHighQualityScaling = false;
+ mIgnoreSuppression = false;
+ mInTransform = false;
+ mInFilter = false;
+ mSyncDecodeImages = false;
+
+ if (!mBuildCaret) {
+ return;
+ }
+
+ RefPtr<PresShell> presShell = GetFocusedPresShell();
+ if (presShell) {
+ RefPtr<nsCaret> caret = presShell->GetCaret();
+ mCaretFrame = caret->GetPaintGeometry(&mCaretRect);
+
+ // The focused pres shell may not be in the document that we're
+ // painting, or be in a popup. Check if the display root for
+ // the caret matches the display root that we're painting, and
+ // only use it if it matches.
+ if (mCaretFrame &&
+ nsLayoutUtils::GetDisplayRootFrame(mCaretFrame) !=
+ nsLayoutUtils::GetDisplayRootFrame(mReferenceFrame)) {
+ mCaretFrame = nullptr;
+ }
+ }
+}
+
+void nsDisplayListBuilder::AddEffectUpdate(dom::RemoteBrowser* aBrowser,
+ const dom::EffectsInfo& aUpdate) {
+ dom::EffectsInfo update = aUpdate;
+ // For printing we create one display item for each page that an iframe
+ // appears on, the proper visible rect is the union of all the visible rects
+ // we get from each display item.
+ nsPresContext* pc =
+ mReferenceFrame ? mReferenceFrame->PresContext() : nullptr;
+ if (pc && (pc->Type() != nsPresContext::eContext_Galley)) {
+ Maybe<dom::EffectsInfo> existing = mEffectsUpdates.MaybeGet(aBrowser);
+ if (existing.isSome()) {
+ // Only the visible rect should differ, the scales should match.
+ MOZ_ASSERT(existing->mRasterScale == aUpdate.mRasterScale &&
+ existing->mTransformToAncestorScale ==
+ aUpdate.mTransformToAncestorScale);
+ update.mVisibleRect = update.mVisibleRect.Union(existing->mVisibleRect);
+ }
+ }
+ mEffectsUpdates.InsertOrUpdate(aBrowser, update);
+}
+
+void nsDisplayListBuilder::EndFrame() {
+ NS_ASSERTION(!mInInvalidSubtree,
+ "Someone forgot to cleanup mInInvalidSubtree!");
+ mCurrentContainerASR = nullptr;
+ mActiveScrolledRoots.Clear();
+ mEffectsUpdates.Clear();
+ FreeClipChains();
+ FreeTemporaryItems();
+ nsCSSRendering::EndFrameTreesLocked();
+ mCaretFrame = nullptr;
+}
+
+void nsDisplayListBuilder::MarkFrameForDisplay(nsIFrame* aFrame,
+ const nsIFrame* aStopAtFrame) {
+ mFramesMarkedForDisplay.AppendElement(aFrame);
+ for (nsIFrame* f = aFrame; f;
+ f = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(f)) {
+ if (f->HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) {
+ return;
+ }
+ f->AddStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO);
+ if (f == aStopAtFrame) {
+ // we've reached a frame that we know will be painted, so we can stop.
+ break;
+ }
+ }
+}
+
+void nsDisplayListBuilder::AddFrameMarkedForDisplayIfVisible(nsIFrame* aFrame) {
+ mFramesMarkedForDisplayIfVisible.AppendElement(aFrame);
+}
+
+static void MarkFrameForDisplayIfVisibleInternal(nsIFrame* aFrame,
+ const nsIFrame* aStopAtFrame) {
+ for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetDisplayListParent(f)) {
+ if (f->ForceDescendIntoIfVisible()) {
+ return;
+ }
+ f->SetForceDescendIntoIfVisible(true);
+
+ // This condition must match the condition in
+ // nsLayoutUtils::GetParentOrPlaceholderFor which is used by
+ // nsLayoutUtils::GetDisplayListParent
+ if (f->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) && !f->GetPrevInFlow()) {
+ nsIFrame* parent = f->GetParent();
+ if (parent && !parent->ForceDescendIntoIfVisible()) {
+ // If the GetDisplayListParent call is going to walk to a placeholder,
+ // in rare cases the placeholder might be contained in a different
+ // continuation from the oof. So we have to make sure to mark the oofs
+ // parent. In the common case this doesn't make us do any extra work,
+ // just changes the order in which we visit the frames since walking
+ // through placeholders will walk through the parent, and we stop when
+ // we find a ForceDescendIntoIfVisible bit set.
+ MarkFrameForDisplayIfVisibleInternal(parent, aStopAtFrame);
+ }
+ }
+
+ if (f == aStopAtFrame) {
+ // we've reached a frame that we know will be painted, so we can stop.
+ break;
+ }
+ }
+}
+
+void nsDisplayListBuilder::MarkFrameForDisplayIfVisible(
+ nsIFrame* aFrame, const nsIFrame* aStopAtFrame) {
+ AddFrameMarkedForDisplayIfVisible(aFrame);
+
+ MarkFrameForDisplayIfVisibleInternal(aFrame, aStopAtFrame);
+}
+
+void nsDisplayListBuilder::SetGlassDisplayItem(nsDisplayItem* aItem) {
+ // Web pages or extensions could trigger the "Multiple glass backgrounds
+ // found?" warning by using -moz-appearance:win-borderless-glass etc on their
+ // own elements (as long as they are root frames, which is rare as each doc
+ // only gets one near the root). We only care about the first one, since that
+ // will be the background of the root window.
+
+ if (IsPartialUpdate()) {
+ if (aItem->Frame()->Style()->IsRootElementStyle()) {
+#ifdef DEBUG
+ if (mHasGlassItemDuringPartial) {
+ NS_WARNING("Multiple glass backgrounds found?");
+ } else
+#endif
+ if (!mHasGlassItemDuringPartial) {
+ mHasGlassItemDuringPartial = true;
+ aItem->SetIsGlassItem();
+ }
+ }
+ return;
+ }
+
+ if (aItem->Frame()->Style()->IsRootElementStyle()) {
+#ifdef DEBUG
+ if (mGlassDisplayItem) {
+ NS_WARNING("Multiple glass backgrounds found?");
+ } else
+#endif
+ if (!mGlassDisplayItem) {
+ mGlassDisplayItem = aItem;
+ mGlassDisplayItem->SetIsGlassItem();
+ }
+ }
+}
+
+bool nsDisplayListBuilder::NeedToForceTransparentSurfaceForItem(
+ nsDisplayItem* aItem) {
+ return aItem == mGlassDisplayItem;
+}
+
+void nsDisplayListBuilder::SetIsRelativeToLayoutViewport() {
+ mIsRelativeToLayoutViewport = true;
+ UpdateShouldBuildAsyncZoomContainer();
+}
+
+void nsDisplayListBuilder::UpdateShouldBuildAsyncZoomContainer() {
+ const Document* document = mReferenceFrame->PresContext()->Document();
+ mBuildAsyncZoomContainer = !mIsRelativeToLayoutViewport &&
+ !document->Fullscreen() &&
+ nsLayoutUtils::AllowZoomingForDocument(document);
+}
+
+// Certain prefs may cause display list items to be added or removed when they
+// are toggled. In those cases, we need to fully rebuild the display list.
+bool nsDisplayListBuilder::ShouldRebuildDisplayListDueToPrefChange() {
+ // If we transition between wrapping the RCD-RSF contents into an async
+ // zoom container vs. not, we need to rebuild the display list. This only
+ // happens when the zooming or container scrolling prefs are toggled
+ // (manually by the user, or during test setup).
+ bool didBuildAsyncZoomContainer = mBuildAsyncZoomContainer;
+ UpdateShouldBuildAsyncZoomContainer();
+
+ bool hadOverlayScrollbarsLastTime = mUseOverlayScrollbars;
+ mUseOverlayScrollbars =
+ !!LookAndFeel::GetInt(LookAndFeel::IntID::UseOverlayScrollbars);
+
+ bool alwaysLayerizedScrollbarsLastTime = mAlwaysLayerizeScrollbars;
+ mAlwaysLayerizeScrollbars =
+ StaticPrefs::layout_scrollbars_always_layerize_track();
+
+ if (didBuildAsyncZoomContainer != mBuildAsyncZoomContainer) {
+ return true;
+ }
+
+ if (hadOverlayScrollbarsLastTime != mUseOverlayScrollbars) {
+ return true;
+ }
+
+ if (alwaysLayerizedScrollbarsLastTime != mAlwaysLayerizeScrollbars) {
+ return true;
+ }
+
+ return false;
+}
+
+void nsDisplayListBuilder::AddScrollFrameToNotify(
+ nsIScrollableFrame* aScrollFrame) {
+ mScrollFramesToNotify.insert(aScrollFrame);
+}
+
+void nsDisplayListBuilder::NotifyAndClearScrollFrames() {
+ for (const auto& it : mScrollFramesToNotify) {
+ it->NotifyApzTransaction();
+ }
+ mScrollFramesToNotify.clear();
+}
+
+bool nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay(
+ nsIFrame* aDirtyFrame, nsIFrame* aFrame, const nsRect& aVisibleRect,
+ const nsRect& aDirtyRect) {
+ MOZ_ASSERT(aFrame->GetParent() == aDirtyFrame);
+ nsRect dirty;
+ nsRect visible = OutOfFlowDisplayData::ComputeVisibleRectForFrame(
+ this, aFrame, aVisibleRect, aDirtyRect, &dirty);
+ if (!aFrame->HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO) &&
+ visible.IsEmpty()) {
+ return false;
+ }
+
+ // Only MarkFrameForDisplay if we're dirty. If this is a nested out-of-flow
+ // frame, then it will also mark any outer frames to ensure that building
+ // reaches the dirty feame.
+ if (!dirty.IsEmpty() || aFrame->ForceDescendIntoIfVisible()) {
+ MarkFrameForDisplay(aFrame, aDirtyFrame);
+ }
+
+ return true;
+}
+
+static void UnmarkFrameForDisplay(nsIFrame* aFrame,
+ const nsIFrame* aStopAtFrame) {
+ for (nsIFrame* f = aFrame; f;
+ f = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(f)) {
+ if (!f->HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) {
+ return;
+ }
+ f->RemoveStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO);
+ if (f == aStopAtFrame) {
+ // we've reached a frame that we know will be painted, so we can stop.
+ break;
+ }
+ }
+}
+
+static void UnmarkFrameForDisplayIfVisible(nsIFrame* aFrame) {
+ for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetDisplayListParent(f)) {
+ if (!f->ForceDescendIntoIfVisible()) {
+ return;
+ }
+ f->SetForceDescendIntoIfVisible(false);
+
+ // This condition must match the condition in
+ // nsLayoutUtils::GetParentOrPlaceholderFor which is used by
+ // nsLayoutUtils::GetDisplayListParent
+ if (f->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) && !f->GetPrevInFlow()) {
+ nsIFrame* parent = f->GetParent();
+ if (parent && parent->ForceDescendIntoIfVisible()) {
+ // If the GetDisplayListParent call is going to walk to a placeholder,
+ // in rare cases the placeholder might be contained in a different
+ // continuation from the oof. So we have to make sure to mark the oofs
+ // parent. In the common case this doesn't make us do any extra work,
+ // just changes the order in which we visit the frames since walking
+ // through placeholders will walk through the parent, and we stop when
+ // we find a ForceDescendIntoIfVisible bit set.
+ UnmarkFrameForDisplayIfVisible(f);
+ }
+ }
+ }
+}
+
+nsDisplayListBuilder::~nsDisplayListBuilder() {
+ NS_ASSERTION(mFramesMarkedForDisplay.Length() == 0,
+ "All frames should have been unmarked");
+ NS_ASSERTION(mFramesWithOOFData.Length() == 0,
+ "All OOF data should have been removed");
+ NS_ASSERTION(mPresShellStates.Length() == 0,
+ "All presshells should have been exited");
+
+ DisplayItemClipChain* c = mFirstClipChainToDestroy;
+ while (c) {
+ DisplayItemClipChain* next = c->mNextClipChainToDestroy;
+ c->DisplayItemClipChain::~DisplayItemClipChain();
+ c = next;
+ }
+
+ MOZ_COUNT_DTOR(nsDisplayListBuilder);
+}
+
+uint32_t nsDisplayListBuilder::GetBackgroundPaintFlags() {
+ uint32_t flags = 0;
+ if (mSyncDecodeImages) {
+ flags |= nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES;
+ }
+ if (mIsPaintingToWindow) {
+ flags |= nsCSSRendering::PAINTBG_TO_WINDOW;
+ }
+ if (mUseHighQualityScaling) {
+ flags |= nsCSSRendering::PAINTBG_HIGH_QUALITY_SCALING;
+ }
+ return flags;
+}
+
+// TODO(emilio): Maybe unify BackgroundPaintFlags and IamgeRendererFlags.
+uint32_t nsDisplayListBuilder::GetImageRendererFlags() const {
+ uint32_t flags = 0;
+ if (mSyncDecodeImages) {
+ flags |= nsImageRenderer::FLAG_SYNC_DECODE_IMAGES;
+ }
+ if (mIsPaintingToWindow) {
+ flags |= nsImageRenderer::FLAG_PAINTING_TO_WINDOW;
+ }
+ if (mUseHighQualityScaling) {
+ flags |= nsImageRenderer::FLAG_HIGH_QUALITY_SCALING;
+ }
+ return flags;
+}
+
+uint32_t nsDisplayListBuilder::GetImageDecodeFlags() const {
+ uint32_t flags = imgIContainer::FLAG_ASYNC_NOTIFY;
+ if (mSyncDecodeImages) {
+ flags |= imgIContainer::FLAG_SYNC_DECODE;
+ } else {
+ flags |= imgIContainer::FLAG_SYNC_DECODE_IF_FAST;
+ }
+ if (mIsPaintingToWindow || mUseHighQualityScaling) {
+ flags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
+ }
+ return flags;
+}
+
+void nsDisplayListBuilder::SubtractFromVisibleRegion(nsRegion* aVisibleRegion,
+ const nsRegion& aRegion) {
+ if (aRegion.IsEmpty()) {
+ return;
+ }
+
+ nsRegion tmp;
+ tmp.Sub(*aVisibleRegion, aRegion);
+ // Don't let *aVisibleRegion get too complex, but don't let it fluff out
+ // to its bounds either, which can be very bad (see bug 516740).
+ // Do let aVisibleRegion get more complex if by doing so we reduce its
+ // area by at least half.
+ if (tmp.GetNumRects() <= 15 || tmp.Area() <= aVisibleRegion->Area() / 2) {
+ *aVisibleRegion = tmp;
+ }
+}
+
+nsCaret* nsDisplayListBuilder::GetCaret() {
+ RefPtr<nsCaret> caret = CurrentPresShellState()->mPresShell->GetCaret();
+ return caret;
+}
+
+void nsDisplayListBuilder::IncrementPresShellPaintCount(PresShell* aPresShell) {
+ if (mIsPaintingToWindow) {
+ aPresShell->IncrementPaintCount();
+ }
+}
+
+void nsDisplayListBuilder::EnterPresShell(const nsIFrame* aReferenceFrame,
+ bool aPointerEventsNoneDoc) {
+ PresShellState* state = mPresShellStates.AppendElement();
+ state->mPresShell = aReferenceFrame->PresShell();
+ state->mFirstFrameMarkedForDisplay = mFramesMarkedForDisplay.Length();
+ state->mFirstFrameWithOOFData = mFramesWithOOFData.Length();
+
+ nsIScrollableFrame* sf = state->mPresShell->GetRootScrollFrameAsScrollable();
+ if (sf && IsInSubdocument()) {
+ // We are forcing a rebuild of nsDisplayCanvasBackgroundColor to make sure
+ // that the canvas background color will be set correctly, and that only one
+ // unscrollable item will be created.
+ // This is done to avoid, for example, a case where only scrollbar frames
+ // are invalidated - we would skip creating nsDisplayCanvasBackgroundColor
+ // and possibly end up with an extra nsDisplaySolidColor item.
+ // We skip this for the root document, since we don't want to use
+ // MarkFrameForDisplayIfVisible before ComputeRebuildRegion. We'll
+ // do it manually there.
+ nsCanvasFrame* canvasFrame = do_QueryFrame(sf->GetScrolledFrame());
+ if (canvasFrame) {
+ MarkFrameForDisplayIfVisible(canvasFrame, aReferenceFrame);
+ }
+ }
+
+#ifdef DEBUG
+ state->mAutoLayoutPhase.emplace(aReferenceFrame->PresContext(),
+ nsLayoutPhase::DisplayListBuilding);
+#endif
+
+ state->mPresShell->UpdateCanvasBackground();
+
+ bool buildCaret = mBuildCaret;
+ if (mIgnoreSuppression || !state->mPresShell->IsPaintingSuppressed()) {
+ state->mIsBackgroundOnly = false;
+ } else {
+ state->mIsBackgroundOnly = true;
+ buildCaret = false;
+ }
+
+ bool pointerEventsNone = aPointerEventsNoneDoc;
+ if (IsInSubdocument()) {
+ pointerEventsNone |= mPresShellStates[mPresShellStates.Length() - 2]
+ .mInsidePointerEventsNoneDoc;
+ }
+ state->mInsidePointerEventsNoneDoc = pointerEventsNone;
+
+ state->mPresShellIgnoreScrollFrame =
+ state->mPresShell->IgnoringViewportScrolling()
+ ? state->mPresShell->GetRootScrollFrame()
+ : nullptr;
+
+ nsPresContext* pc = aReferenceFrame->PresContext();
+ mIsInChromePresContext = pc->IsChrome();
+ nsIDocShell* docShell = pc->GetDocShell();
+
+ if (docShell) {
+ docShell->GetWindowDraggingAllowed(&mWindowDraggingAllowed);
+ }
+
+ state->mTouchEventPrefEnabledDoc = dom::TouchEvent::PrefEnabled(docShell);
+
+ if (!buildCaret) {
+ return;
+ }
+
+ // Caret frames add visual area to their frame, but we don't update the
+ // overflow area. Use flags to make sure we build display items for that frame
+ // instead.
+ if (mCaretFrame && mCaretFrame->PresShell() == state->mPresShell) {
+ MarkFrameForDisplay(mCaretFrame, aReferenceFrame);
+ }
+}
+
+// A non-blank paint is a paint that does not just contain the canvas
+// background.
+static bool DisplayListIsNonBlank(nsDisplayList* aList) {
+ for (nsDisplayItem* i : *aList) {
+ switch (i->GetType()) {
+ case DisplayItemType::TYPE_COMPOSITOR_HITTEST_INFO:
+ case DisplayItemType::TYPE_CANVAS_BACKGROUND_COLOR:
+ case DisplayItemType::TYPE_CANVAS_BACKGROUND_IMAGE:
+ continue;
+ case DisplayItemType::TYPE_SOLID_COLOR:
+ case DisplayItemType::TYPE_BACKGROUND:
+ case DisplayItemType::TYPE_BACKGROUND_COLOR:
+ if (i->Frame()->IsCanvasFrame()) {
+ continue;
+ }
+ return true;
+ default:
+ return true;
+ }
+ }
+ return false;
+}
+
+// A contentful paint is a paint that does contains DOM content (text,
+// images, non-blank canvases, SVG): "First Contentful Paint entry
+// contains a DOMHighResTimeStamp reporting the time when the browser
+// first rendered any text, image (including background images),
+// non-white canvas or SVG. This excludes any content of iframes, but
+// includes text with pending webfonts. This is the first time users
+// could start consuming page content."
+static bool DisplayListIsContentful(nsDisplayListBuilder* aBuilder,
+ nsDisplayList* aList) {
+ for (nsDisplayItem* i : *aList) {
+ DisplayItemType type = i->GetType();
+ nsDisplayList* children = i->GetChildren();
+
+ switch (type) {
+ case DisplayItemType::TYPE_SUBDOCUMENT: // iframes are ignored
+ break;
+ // CANVASes check if they may have been modified (as a stand-in
+ // actually tracking all modifications)
+ default:
+ if (i->IsContentful()) {
+ bool dummy;
+ nsRect bound = i->GetBounds(aBuilder, &dummy);
+ if (!bound.IsEmpty()) {
+ return true;
+ }
+ }
+ if (children) {
+ if (DisplayListIsContentful(aBuilder, children)) {
+ return true;
+ }
+ }
+ break;
+ }
+ }
+ return false;
+}
+
+void nsDisplayListBuilder::LeavePresShell(const nsIFrame* aReferenceFrame,
+ nsDisplayList* aPaintedContents) {
+ NS_ASSERTION(
+ CurrentPresShellState()->mPresShell == aReferenceFrame->PresShell(),
+ "Presshell mismatch");
+
+ if (mIsPaintingToWindow && aPaintedContents) {
+ nsPresContext* pc = aReferenceFrame->PresContext();
+ if (!pc->HadNonBlankPaint()) {
+ if (!CurrentPresShellState()->mIsBackgroundOnly &&
+ DisplayListIsNonBlank(aPaintedContents)) {
+ pc->NotifyNonBlankPaint();
+ }
+ }
+ nsRootPresContext* rootPresContext = pc->GetRootPresContext();
+ if (!pc->HadFirstContentfulPaint() && rootPresContext) {
+ if (!CurrentPresShellState()->mIsBackgroundOnly) {
+ if (pc->HasEverBuiltInvisibleText() ||
+ DisplayListIsContentful(this, aPaintedContents)) {
+ pc->NotifyContentfulPaint();
+ }
+ }
+ }
+ }
+
+ ResetMarkedFramesForDisplayList(aReferenceFrame);
+ mPresShellStates.RemoveLastElement();
+
+ if (!mPresShellStates.IsEmpty()) {
+ nsPresContext* pc = CurrentPresContext();
+ nsIDocShell* docShell = pc->GetDocShell();
+ if (docShell) {
+ docShell->GetWindowDraggingAllowed(&mWindowDraggingAllowed);
+ }
+ mIsInChromePresContext = pc->IsChrome();
+ } else {
+ for (uint32_t i = 0; i < mFramesMarkedForDisplayIfVisible.Length(); ++i) {
+ UnmarkFrameForDisplayIfVisible(mFramesMarkedForDisplayIfVisible[i]);
+ }
+ mFramesMarkedForDisplayIfVisible.SetLength(0);
+ }
+}
+
+void nsDisplayListBuilder::FreeClipChains() {
+ // Iterate the clip chains from newest to oldest (forward
+ // iteration), so that we destroy descendants first which
+ // will drop the ref count on their ancestors.
+ DisplayItemClipChain** indirect = &mFirstClipChainToDestroy;
+
+ while (*indirect) {
+ if (!(*indirect)->mRefCount) {
+ DisplayItemClipChain* next = (*indirect)->mNextClipChainToDestroy;
+
+ mClipDeduplicator.erase(*indirect);
+ (*indirect)->DisplayItemClipChain::~DisplayItemClipChain();
+ Destroy(DisplayListArenaObjectId::CLIPCHAIN, *indirect);
+
+ *indirect = next;
+ } else {
+ indirect = &(*indirect)->mNextClipChainToDestroy;
+ }
+ }
+}
+
+void nsDisplayListBuilder::FreeTemporaryItems() {
+ for (nsDisplayItem* i : mTemporaryItems) {
+ // Temporary display items are not added to the frames.
+ MOZ_ASSERT(i->Frame());
+ i->RemoveFrame(i->Frame());
+ i->Destroy(this);
+ }
+
+ mTemporaryItems.Clear();
+}
+
+void nsDisplayListBuilder::ResetMarkedFramesForDisplayList(
+ const nsIFrame* aReferenceFrame) {
+ // Unmark and pop off the frames marked for display in this pres shell.
+ uint32_t firstFrameForShell =
+ CurrentPresShellState()->mFirstFrameMarkedForDisplay;
+ for (uint32_t i = firstFrameForShell; i < mFramesMarkedForDisplay.Length();
+ ++i) {
+ UnmarkFrameForDisplay(mFramesMarkedForDisplay[i], aReferenceFrame);
+ }
+ mFramesMarkedForDisplay.SetLength(firstFrameForShell);
+
+ firstFrameForShell = CurrentPresShellState()->mFirstFrameWithOOFData;
+ for (uint32_t i = firstFrameForShell; i < mFramesWithOOFData.Length(); ++i) {
+ mFramesWithOOFData[i]->RemoveProperty(OutOfFlowDisplayDataProperty());
+ }
+ mFramesWithOOFData.SetLength(firstFrameForShell);
+}
+
+void nsDisplayListBuilder::ClearFixedBackgroundDisplayData() {
+ CurrentPresShellState()->mFixedBackgroundDisplayData = Nothing();
+}
+
+void nsDisplayListBuilder::MarkFramesForDisplayList(
+ nsIFrame* aDirtyFrame, const nsFrameList& aFrames) {
+ nsRect visibleRect = GetVisibleRect();
+ nsRect dirtyRect = GetDirtyRect();
+
+ // If we are entering content that is fixed to the RCD-RSF, we are
+ // crossing the async zoom container boundary, and need to convert from
+ // visual to layout coordinates.
+ if (ViewportFrame* viewportFrame = do_QueryFrame(aDirtyFrame)) {
+ if (IsForEventDelivery() && ShouldBuildAsyncZoomContainer() &&
+ viewportFrame->PresContext()->IsRootContentDocumentCrossProcess()) {
+ if (viewportFrame->PresShell()->GetRootScrollFrame()) {
+#ifdef DEBUG
+ for (nsIFrame* f : aFrames) {
+ MOZ_ASSERT(ViewportUtils::IsZoomedContentRoot(f));
+ }
+#endif
+ visibleRect = ViewportUtils::VisualToLayout(visibleRect,
+ viewportFrame->PresShell());
+ dirtyRect = ViewportUtils::VisualToLayout(dirtyRect,
+ viewportFrame->PresShell());
+ }
+#ifdef DEBUG
+ else {
+ // This is an edge case that should only happen if we are in a
+ // document with a XUL root element so that it does not have a root
+ // scroll frame but it has fixed pos content and all of the frames in
+ // aFrames are that fixed pos content.
+ for (nsIFrame* f : aFrames) {
+ MOZ_ASSERT(!ViewportUtils::IsZoomedContentRoot(f) &&
+ f->GetParent() == aDirtyFrame &&
+ f->StyleDisplay()->mPosition ==
+ StylePositionProperty::Fixed);
+ }
+ // There's no root scroll frame so there can't be any zooming or async
+ // panning so we don't need to adjust the visible and dirty rects.
+ }
+#endif
+ }
+ }
+
+ bool markedFrames = false;
+ for (nsIFrame* e : aFrames) {
+ // Skip the AccessibleCaret frame when building no caret.
+ if (!IsBuildingCaret()) {
+ nsIContent* content = e->GetContent();
+ if (content && content->IsInNativeAnonymousSubtree() &&
+ content->IsElement()) {
+ auto* classList = content->AsElement()->ClassList();
+ if (classList->Contains(u"moz-accessiblecaret"_ns)) {
+ continue;
+ }
+ }
+ }
+ if (MarkOutOfFlowFrameForDisplay(aDirtyFrame, e, visibleRect, dirtyRect)) {
+ markedFrames = true;
+ }
+ }
+
+ if (markedFrames) {
+ // mClipState.GetClipChainForContainingBlockDescendants can return pointers
+ // to objects on the stack, so we need to clone the chain.
+ const DisplayItemClipChain* clipChain =
+ CopyWholeChain(mClipState.GetClipChainForContainingBlockDescendants());
+ const DisplayItemClipChain* combinedClipChain =
+ mClipState.GetCurrentCombinedClipChain(this);
+ const ActiveScrolledRoot* asr = mCurrentActiveScrolledRoot;
+
+ OutOfFlowDisplayData* data = new OutOfFlowDisplayData(
+ clipChain, combinedClipChain, asr, this->mCurrentScrollParentId,
+ visibleRect, dirtyRect);
+ aDirtyFrame->SetProperty(
+ nsDisplayListBuilder::OutOfFlowDisplayDataProperty(), data);
+ mFramesWithOOFData.AppendElement(aDirtyFrame);
+ }
+
+ if (!aDirtyFrame->GetParent()) {
+ // This is the viewport frame of aDirtyFrame's presshell.
+ // Store the current display data so that it can be used for fixed
+ // background images.
+ NS_ASSERTION(
+ CurrentPresShellState()->mPresShell == aDirtyFrame->PresShell(),
+ "Presshell mismatch");
+ MOZ_ASSERT(!CurrentPresShellState()->mFixedBackgroundDisplayData,
+ "already traversed this presshell's root frame?");
+
+ const DisplayItemClipChain* clipChain =
+ CopyWholeChain(mClipState.GetClipChainForContainingBlockDescendants());
+ const DisplayItemClipChain* combinedClipChain =
+ mClipState.GetCurrentCombinedClipChain(this);
+ const ActiveScrolledRoot* asr = mCurrentActiveScrolledRoot;
+ CurrentPresShellState()->mFixedBackgroundDisplayData.emplace(
+ clipChain, combinedClipChain, asr, this->mCurrentScrollParentId,
+ GetVisibleRect(), GetDirtyRect());
+ }
+}
+
+/**
+ * Mark all preserve-3d children with
+ * NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO to make sure
+ * nsIFrame::BuildDisplayListForChild() would visit them. Also compute
+ * dirty rect for preserve-3d children.
+ *
+ * @param aDirtyFrame is the frame to mark children extending context.
+ */
+void nsDisplayListBuilder::MarkPreserve3DFramesForDisplayList(
+ nsIFrame* aDirtyFrame) {
+ for (const auto& childList : aDirtyFrame->ChildLists()) {
+ for (nsIFrame* child : childList.mList) {
+ if (child->Combines3DTransformWithAncestors()) {
+ MarkFrameForDisplay(child, aDirtyFrame);
+ }
+
+ if (child->IsBlockWrapper()) {
+ // Mark preserve-3d frames inside the block wrapper.
+ MarkPreserve3DFramesForDisplayList(child);
+ }
+ }
+ }
+}
+
+ActiveScrolledRoot* nsDisplayListBuilder::AllocateActiveScrolledRoot(
+ const ActiveScrolledRoot* aParent, nsIScrollableFrame* aScrollableFrame) {
+ RefPtr<ActiveScrolledRoot> asr = ActiveScrolledRoot::CreateASRForFrame(
+ aParent, aScrollableFrame, IsRetainingDisplayList());
+ mActiveScrolledRoots.AppendElement(asr);
+ return asr;
+}
+
+const DisplayItemClipChain* nsDisplayListBuilder::AllocateDisplayItemClipChain(
+ const DisplayItemClip& aClip, const ActiveScrolledRoot* aASR,
+ const DisplayItemClipChain* aParent) {
+ MOZ_ASSERT(!(aParent && aParent->mOnStack));
+ void* p = Allocate(sizeof(DisplayItemClipChain),
+ DisplayListArenaObjectId::CLIPCHAIN);
+ DisplayItemClipChain* c = new (KnownNotNull, p)
+ DisplayItemClipChain(aClip, aASR, aParent, mFirstClipChainToDestroy);
+#ifdef DEBUG
+ c->mOnStack = false;
+#endif
+ auto result = mClipDeduplicator.insert(c);
+ if (!result.second) {
+ // An equivalent clip chain item was already created, so let's return that
+ // instead. Destroy the one we just created.
+ // Note that this can cause clip chains from different coordinate systems to
+ // collapse into the same clip chain object, because clip chains do not keep
+ // track of the reference frame that they were created in.
+ c->DisplayItemClipChain::~DisplayItemClipChain();
+ Destroy(DisplayListArenaObjectId::CLIPCHAIN, c);
+ return *(result.first);
+ }
+ mFirstClipChainToDestroy = c;
+ return c;
+}
+
+struct ClipChainItem {
+ DisplayItemClip clip;
+ const ActiveScrolledRoot* asr;
+};
+
+static const DisplayItemClipChain* FindCommonAncestorClipForIntersection(
+ const DisplayItemClipChain* aOne, const DisplayItemClipChain* aTwo) {
+ for (const ActiveScrolledRoot* asr =
+ ActiveScrolledRoot::PickDescendant(aOne->mASR, aTwo->mASR);
+ asr; asr = asr->mParent) {
+ if (aOne == aTwo) {
+ return aOne;
+ }
+ if (aOne->mASR == asr) {
+ aOne = aOne->mParent;
+ }
+ if (aTwo->mASR == asr) {
+ aTwo = aTwo->mParent;
+ }
+ if (!aOne) {
+ return aTwo;
+ }
+ if (!aTwo) {
+ return aOne;
+ }
+ }
+ return nullptr;
+}
+
+const DisplayItemClipChain* nsDisplayListBuilder::CreateClipChainIntersection(
+ const DisplayItemClipChain* aAncestor,
+ const DisplayItemClipChain* aLeafClip1,
+ const DisplayItemClipChain* aLeafClip2) {
+ AutoTArray<ClipChainItem, 8> intersectedClips;
+
+ const DisplayItemClipChain* clip1 = aLeafClip1;
+ const DisplayItemClipChain* clip2 = aLeafClip2;
+
+ const ActiveScrolledRoot* asr = ActiveScrolledRoot::PickDescendant(
+ clip1 ? clip1->mASR : nullptr, clip2 ? clip2->mASR : nullptr);
+
+ // Build up the intersection from the leaf to the root and put it into
+ // intersectedClips. The loop below will convert intersectedClips into an
+ // actual DisplayItemClipChain.
+ // (We need to do this in two passes because we need the parent clip in order
+ // to create the DisplayItemClipChain object, but the parent clip has not
+ // been created at that point.)
+ while (!aAncestor || asr != aAncestor->mASR) {
+ if (clip1 && clip1->mASR == asr) {
+ if (clip2 && clip2->mASR == asr) {
+ DisplayItemClip intersection = clip1->mClip;
+ intersection.IntersectWith(clip2->mClip);
+ intersectedClips.AppendElement(ClipChainItem{intersection, asr});
+ clip2 = clip2->mParent;
+ } else {
+ intersectedClips.AppendElement(ClipChainItem{clip1->mClip, asr});
+ }
+ clip1 = clip1->mParent;
+ } else if (clip2 && clip2->mASR == asr) {
+ intersectedClips.AppendElement(ClipChainItem{clip2->mClip, asr});
+ clip2 = clip2->mParent;
+ }
+ if (!asr) {
+ MOZ_ASSERT(!aAncestor, "We should have exited this loop earlier");
+ break;
+ }
+ asr = asr->mParent;
+ }
+
+ // Convert intersectedClips into a DisplayItemClipChain.
+ const DisplayItemClipChain* parentSC = aAncestor;
+ for (auto& sc : Reversed(intersectedClips)) {
+ parentSC = AllocateDisplayItemClipChain(sc.clip, sc.asr, parentSC);
+ }
+ return parentSC;
+}
+
+const DisplayItemClipChain* nsDisplayListBuilder::CreateClipChainIntersection(
+ const DisplayItemClipChain* aLeafClip1,
+ const DisplayItemClipChain* aLeafClip2) {
+ // aLeafClip2 might be a reference to a clip on the stack. We need to make
+ // sure that CreateClipChainIntersection will allocate the actual intersected
+ // clip in the builder's arena, so for the aLeafClip1 == nullptr case,
+ // we supply nullptr as the common ancestor so that
+ // CreateClipChainIntersection clones the whole chain.
+ const DisplayItemClipChain* ancestorClip =
+ aLeafClip1 ? FindCommonAncestorClipForIntersection(aLeafClip1, aLeafClip2)
+ : nullptr;
+
+ return CreateClipChainIntersection(ancestorClip, aLeafClip1, aLeafClip2);
+}
+
+const DisplayItemClipChain* nsDisplayListBuilder::CopyWholeChain(
+ const DisplayItemClipChain* aClipChain) {
+ return CreateClipChainIntersection(nullptr, aClipChain, nullptr);
+}
+
+const nsIFrame* nsDisplayListBuilder::FindReferenceFrameFor(
+ const nsIFrame* aFrame, nsPoint* aOffset) const {
+ auto MaybeApplyAdditionalOffset = [&]() {
+ if (auto offset = AdditionalOffset()) {
+ *aOffset += *offset;
+ }
+ };
+
+ if (aFrame == mCurrentFrame) {
+ if (aOffset) {
+ *aOffset = mCurrentOffsetToReferenceFrame;
+ }
+ return mCurrentReferenceFrame;
+ }
+
+ for (const nsIFrame* f = aFrame; f;
+ f = nsLayoutUtils::GetCrossDocParentFrameInProcess(f)) {
+ if (f == mReferenceFrame || f->IsTransformed()) {
+ if (aOffset) {
+ *aOffset = aFrame->GetOffsetToCrossDoc(f);
+ MaybeApplyAdditionalOffset();
+ }
+ return f;
+ }
+ }
+
+ if (aOffset) {
+ *aOffset = aFrame->GetOffsetToCrossDoc(mReferenceFrame);
+ MaybeApplyAdditionalOffset();
+ }
+
+ return mReferenceFrame;
+}
+
+// Sticky frames are active if their nearest scrollable frame is also active.
+static bool IsStickyFrameActive(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame) {
+ MOZ_ASSERT(aFrame->StyleDisplay()->mPosition ==
+ StylePositionProperty::Sticky);
+
+ StickyScrollContainer* stickyScrollContainer =
+ StickyScrollContainer::GetStickyScrollContainerForFrame(aFrame);
+ return stickyScrollContainer &&
+ stickyScrollContainer->ScrollFrame()->IsMaybeAsynchronouslyScrolled();
+}
+
+bool nsDisplayListBuilder::IsAnimatedGeometryRoot(nsIFrame* aFrame,
+ nsIFrame** aParent) {
+ if (aFrame == mReferenceFrame) {
+ return true;
+ }
+
+ if (!IsPaintingToWindow()) {
+ if (aParent) {
+ *aParent = nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
+ }
+ return false;
+ }
+
+ nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
+ if (!parent) {
+ return true;
+ }
+ *aParent = parent;
+
+ if (aFrame->StyleDisplay()->mPosition == StylePositionProperty::Sticky &&
+ IsStickyFrameActive(this, aFrame)) {
+ return true;
+ }
+
+ if (aFrame->IsTransformed()) {
+ if (EffectCompositor::HasAnimationsForCompositor(
+ aFrame, DisplayItemType::TYPE_TRANSFORM)) {
+ return true;
+ }
+ }
+
+ LayoutFrameType parentType = parent->Type();
+ if (parentType == LayoutFrameType::Scroll ||
+ parentType == LayoutFrameType::ListControl) {
+ nsIScrollableFrame* sf = do_QueryFrame(parent);
+ if (sf->GetScrolledFrame() == aFrame) {
+ MOZ_ASSERT(!aFrame->IsTransformed());
+ return sf->IsMaybeAsynchronouslyScrolled();
+ }
+ }
+
+ return false;
+}
+
+nsIFrame* nsDisplayListBuilder::FindAnimatedGeometryRootFrameFor(
+ nsIFrame* aFrame) {
+ MOZ_ASSERT(nsLayoutUtils::IsAncestorFrameCrossDocInProcess(
+ RootReferenceFrame(), aFrame));
+ nsIFrame* cursor = aFrame;
+ while (cursor != RootReferenceFrame()) {
+ nsIFrame* next;
+ if (IsAnimatedGeometryRoot(cursor, &next)) {
+ return cursor;
+ }
+ cursor = next;
+ }
+ return cursor;
+}
+
+static nsRect ApplyAllClipNonRoundedIntersection(
+ const DisplayItemClipChain* aClipChain, const nsRect& aRect) {
+ nsRect result = aRect;
+ while (aClipChain) {
+ result = aClipChain->mClip.ApplyNonRoundedIntersection(result);
+ aClipChain = aClipChain->mParent;
+ }
+ return result;
+}
+
+void nsDisplayListBuilder::AdjustWindowDraggingRegion(nsIFrame* aFrame) {
+ if (!mWindowDraggingAllowed || !IsForPainting()) {
+ return;
+ }
+
+ const nsStyleUIReset* styleUI = aFrame->StyleUIReset();
+ if (styleUI->mWindowDragging == StyleWindowDragging::Default) {
+ // This frame has the default value and doesn't influence the window
+ // dragging region.
+ return;
+ }
+
+ LayoutDeviceToLayoutDeviceMatrix4x4 referenceFrameToRootReferenceFrame;
+
+ // The const_cast is for nsLayoutUtils::GetTransformToAncestor.
+ nsIFrame* referenceFrame =
+ const_cast<nsIFrame*>(FindReferenceFrameFor(aFrame));
+
+ if (IsInTransform()) {
+ // Only support 2d rectilinear transforms. Transform support is needed for
+ // the horizontal flip transform that's applied to the urlbar textbox in
+ // RTL mode - it should be able to exclude itself from the draggable region.
+ referenceFrameToRootReferenceFrame =
+ ViewAs<LayoutDeviceToLayoutDeviceMatrix4x4>(
+ nsLayoutUtils::GetTransformToAncestor(RelativeTo{referenceFrame},
+ RelativeTo{mReferenceFrame})
+ .GetMatrix());
+ Matrix referenceFrameToRootReferenceFrame2d;
+ if (!referenceFrameToRootReferenceFrame.Is2D(
+ &referenceFrameToRootReferenceFrame2d) ||
+ !referenceFrameToRootReferenceFrame2d.IsRectilinear()) {
+ return;
+ }
+ } else {
+ MOZ_ASSERT(referenceFrame == mReferenceFrame,
+ "referenceFrameToRootReferenceFrame needs to be adjusted");
+ }
+
+ // We do some basic visibility checking on the frame's border box here.
+ // We intersect it both with the current dirty rect and with the current
+ // clip. Either one is just a conservative approximation on its own, but
+ // their intersection luckily works well enough for our purposes, so that
+ // we don't have to do full-blown visibility computations.
+ // The most important case we need to handle is the scrolled-off tab:
+ // If the tab bar overflows, tab parts that are clipped by the scrollbox
+ // should not be allowed to interfere with the window dragging region. Using
+ // just the current DisplayItemClip is not enough to cover this case
+ // completely because clips are reset while building stacking context
+ // contents, so for example we'd fail to clip frames that have a clip path
+ // applied to them. But the current dirty rect doesn't get reset in that
+ // case, so we use it to make this case work.
+ nsRect borderBox = aFrame->GetRectRelativeToSelf().Intersect(mVisibleRect);
+ borderBox += ToReferenceFrame(aFrame);
+ const DisplayItemClipChain* clip =
+ ClipState().GetCurrentCombinedClipChain(this);
+ borderBox = ApplyAllClipNonRoundedIntersection(clip, borderBox);
+ if (borderBox.IsEmpty()) {
+ return;
+ }
+
+ LayoutDeviceRect devPixelBorderBox = LayoutDevicePixel::FromAppUnits(
+ borderBox, aFrame->PresContext()->AppUnitsPerDevPixel());
+
+ LayoutDeviceRect transformedDevPixelBorderBox =
+ TransformBy(referenceFrameToRootReferenceFrame, devPixelBorderBox);
+ transformedDevPixelBorderBox.Round();
+ LayoutDeviceIntRect transformedDevPixelBorderBoxInt;
+
+ if (!transformedDevPixelBorderBox.ToIntRect(
+ &transformedDevPixelBorderBoxInt)) {
+ return;
+ }
+
+ LayoutDeviceIntRegion& region =
+ styleUI->mWindowDragging == StyleWindowDragging::Drag
+ ? mWindowDraggingRegion
+ : mWindowNoDraggingRegion;
+
+ if (!IsRetainingDisplayList()) {
+ region.OrWith(transformedDevPixelBorderBoxInt);
+ return;
+ }
+
+ gfx::IntRect rect(transformedDevPixelBorderBoxInt.ToUnknownRect());
+ if (styleUI->mWindowDragging == StyleWindowDragging::Drag) {
+ mRetainedWindowDraggingRegion.Add(aFrame, rect);
+ } else {
+ mRetainedWindowNoDraggingRegion.Add(aFrame, rect);
+ }
+}
+
+LayoutDeviceIntRegion nsDisplayListBuilder::GetWindowDraggingRegion() const {
+ LayoutDeviceIntRegion result;
+ if (!IsRetainingDisplayList()) {
+ result.Sub(mWindowDraggingRegion, mWindowNoDraggingRegion);
+ return result;
+ }
+
+ LayoutDeviceIntRegion dragRegion =
+ mRetainedWindowDraggingRegion.ToLayoutDeviceIntRegion();
+
+ LayoutDeviceIntRegion noDragRegion =
+ mRetainedWindowNoDraggingRegion.ToLayoutDeviceIntRegion();
+
+ result.Sub(dragRegion, noDragRegion);
+ return result;
+}
+
+void nsDisplayTransform::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const {
+ nsPaintedDisplayItem::AddSizeOfExcludingThis(aSizes);
+ aSizes.mLayoutRetainedDisplayListSize +=
+ aSizes.mState.mMallocSizeOf(mTransformPreserves3D.get());
+}
+
+void nsDisplayListBuilder::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const {
+ mPool.AddSizeOfExcludingThis(aSizes, Arena::ArenaKind::DisplayList);
+
+ size_t n = 0;
+ MallocSizeOf mallocSizeOf = aSizes.mState.mMallocSizeOf;
+ n += mDocumentWillChangeBudgets.ShallowSizeOfExcludingThis(mallocSizeOf);
+ n += mFrameWillChangeBudgets.ShallowSizeOfExcludingThis(mallocSizeOf);
+ n += mEffectsUpdates.ShallowSizeOfExcludingThis(mallocSizeOf);
+ n += mWindowExcludeGlassRegion.SizeOfExcludingThis(mallocSizeOf);
+ n += mRetainedWindowDraggingRegion.SizeOfExcludingThis(mallocSizeOf);
+ n += mRetainedWindowNoDraggingRegion.SizeOfExcludingThis(mallocSizeOf);
+ n += mRetainedWindowOpaqueRegion.SizeOfExcludingThis(mallocSizeOf);
+ // XXX can't measure mClipDeduplicator since it uses std::unordered_set.
+
+ aSizes.mLayoutRetainedDisplayListSize += n;
+}
+
+void RetainedDisplayList::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const {
+ for (nsDisplayItem* item : *this) {
+ item->AddSizeOfExcludingThis(aSizes);
+ if (RetainedDisplayList* children = item->GetChildren()) {
+ children->AddSizeOfExcludingThis(aSizes);
+ }
+ }
+
+ size_t n = 0;
+
+ n += mDAG.mDirectPredecessorList.ShallowSizeOfExcludingThis(
+ aSizes.mState.mMallocSizeOf);
+ n += mDAG.mNodesInfo.ShallowSizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
+ n += mOldItems.ShallowSizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
+
+ aSizes.mLayoutRetainedDisplayListSize += n;
+}
+
+size_t nsDisplayListBuilder::WeakFrameRegion::SizeOfExcludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ size_t n = 0;
+ n += mFrames.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ for (const auto& frame : mFrames) {
+ const UniquePtr<WeakFrame>& weakFrame = frame.mWeakFrame;
+ n += aMallocSizeOf(weakFrame.get());
+ }
+ n += mRects.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ return n;
+}
+
+/**
+ * Removes modified frames and rects from this WeakFrameRegion.
+ */
+void nsDisplayListBuilder::WeakFrameRegion::RemoveModifiedFramesAndRects() {
+ MOZ_ASSERT(mFrames.Length() == mRects.Length());
+
+ uint32_t i = 0;
+ uint32_t length = mFrames.Length();
+
+ while (i < length) {
+ auto& wrapper = mFrames[i];
+
+ if (!wrapper.mWeakFrame->IsAlive() ||
+ AnyContentAncestorModified(wrapper.mWeakFrame->GetFrame())) {
+ // To avoid multiple O(n) shifts in the array, move the last element of
+ // the array to the current position and decrease the array length.
+ mFrameSet.Remove(wrapper.mFrame);
+ mFrames[i] = std::move(mFrames[length - 1]);
+ mRects[i] = std::move(mRects[length - 1]);
+ length--;
+ } else {
+ i++;
+ }
+ }
+
+ mFrames.TruncateLength(length);
+ mRects.TruncateLength(length);
+}
+
+void nsDisplayListBuilder::RemoveModifiedWindowRegions() {
+ mRetainedWindowDraggingRegion.RemoveModifiedFramesAndRects();
+ mRetainedWindowNoDraggingRegion.RemoveModifiedFramesAndRects();
+ mWindowExcludeGlassRegion.RemoveModifiedFramesAndRects();
+ mRetainedWindowOpaqueRegion.RemoveModifiedFramesAndRects();
+
+ mHasGlassItemDuringPartial = false;
+}
+
+void nsDisplayListBuilder::ClearRetainedWindowRegions() {
+ mRetainedWindowDraggingRegion.Clear();
+ mRetainedWindowNoDraggingRegion.Clear();
+ mWindowExcludeGlassRegion.Clear();
+ mRetainedWindowOpaqueRegion.Clear();
+
+ mGlassDisplayItem = nullptr;
+}
+
+const uint32_t gWillChangeAreaMultiplier = 3;
+static uint32_t GetLayerizationCost(const nsSize& aSize) {
+ // There's significant overhead for each layer created from Gecko
+ // (IPC+Shared Objects) and from the backend (like an OpenGL texture).
+ // Therefore we set a minimum cost threshold of a 64x64 area.
+ const int minBudgetCost = 64 * 64;
+
+ const uint32_t budgetCost = std::max(
+ minBudgetCost, nsPresContext::AppUnitsToIntCSSPixels(aSize.width) *
+ nsPresContext::AppUnitsToIntCSSPixels(aSize.height));
+
+ return budgetCost;
+}
+
+bool nsDisplayListBuilder::AddToWillChangeBudget(nsIFrame* aFrame,
+ const nsSize& aSize) {
+ MOZ_ASSERT(IsForPainting());
+
+ if (aFrame->MayHaveWillChangeBudget()) {
+ // The frame is already in the will-change budget.
+ return true;
+ }
+
+ const nsPresContext* presContext = aFrame->PresContext();
+ const nsRect area = presContext->GetVisibleArea();
+ const uint32_t budgetLimit =
+ nsPresContext::AppUnitsToIntCSSPixels(area.width) *
+ nsPresContext::AppUnitsToIntCSSPixels(area.height);
+ const uint32_t cost = GetLayerizationCost(aSize);
+
+ DocumentWillChangeBudget& documentBudget =
+ mDocumentWillChangeBudgets.LookupOrInsert(presContext);
+
+ const bool onBudget =
+ (documentBudget + cost) / gWillChangeAreaMultiplier < budgetLimit;
+
+ if (onBudget) {
+ documentBudget += cost;
+ mFrameWillChangeBudgets.InsertOrUpdate(
+ aFrame, FrameWillChangeBudget(presContext, cost));
+ aFrame->SetMayHaveWillChangeBudget(true);
+ }
+
+ return onBudget;
+}
+
+bool nsDisplayListBuilder::IsInWillChangeBudget(nsIFrame* aFrame,
+ const nsSize& aSize) {
+ if (!IsForPainting()) {
+ // If this nsDisplayListBuilder is not for painting, the layerization should
+ // not matter. Do the simple thing and return false.
+ return false;
+ }
+
+ const bool onBudget = AddToWillChangeBudget(aFrame, aSize);
+ if (onBudget) {
+ return true;
+ }
+
+ auto* pc = aFrame->PresContext();
+ auto* doc = pc->Document();
+ if (!doc->HasWarnedAbout(Document::eIgnoringWillChangeOverBudget)) {
+ AutoTArray<nsString, 2> params;
+ params.AppendElement()->AppendInt(gWillChangeAreaMultiplier);
+
+ nsRect area = pc->GetVisibleArea();
+ uint32_t budgetLimit = nsPresContext::AppUnitsToIntCSSPixels(area.width) *
+ nsPresContext::AppUnitsToIntCSSPixels(area.height);
+ params.AppendElement()->AppendInt(budgetLimit);
+
+ doc->WarnOnceAbout(Document::eIgnoringWillChangeOverBudget, false, params);
+ }
+
+ return false;
+}
+
+void nsDisplayListBuilder::ClearWillChangeBudgetStatus(nsIFrame* aFrame) {
+ MOZ_ASSERT(IsForPainting());
+
+ if (!aFrame->MayHaveWillChangeBudget()) {
+ return;
+ }
+
+ aFrame->SetMayHaveWillChangeBudget(false);
+ RemoveFromWillChangeBudgets(aFrame);
+}
+
+void nsDisplayListBuilder::RemoveFromWillChangeBudgets(const nsIFrame* aFrame) {
+ if (auto entry = mFrameWillChangeBudgets.Lookup(aFrame)) {
+ const FrameWillChangeBudget& frameBudget = entry.Data();
+
+ auto documentBudget =
+ mDocumentWillChangeBudgets.Lookup(frameBudget.mPresContext);
+
+ if (documentBudget) {
+ *documentBudget -= frameBudget.mUsage;
+ }
+
+ entry.Remove();
+ }
+}
+
+void nsDisplayListBuilder::ClearWillChangeBudgets() {
+ mFrameWillChangeBudgets.Clear();
+ mDocumentWillChangeBudgets.Clear();
+}
+
+void nsDisplayListBuilder::EnterSVGEffectsContents(
+ nsIFrame* aEffectsFrame, nsDisplayList* aHoistedItemsStorage) {
+ MOZ_ASSERT(aHoistedItemsStorage);
+ if (mSVGEffectsFrames.IsEmpty()) {
+ MOZ_ASSERT(!mScrollInfoItemsForHoisting);
+ mScrollInfoItemsForHoisting = aHoistedItemsStorage;
+ }
+ mSVGEffectsFrames.AppendElement(aEffectsFrame);
+}
+
+void nsDisplayListBuilder::ExitSVGEffectsContents() {
+ MOZ_ASSERT(!mSVGEffectsFrames.IsEmpty());
+ mSVGEffectsFrames.RemoveLastElement();
+ MOZ_ASSERT(mScrollInfoItemsForHoisting);
+ if (mSVGEffectsFrames.IsEmpty()) {
+ mScrollInfoItemsForHoisting = nullptr;
+ }
+}
+
+bool nsDisplayListBuilder::ShouldBuildScrollInfoItemsForHoisting() const {
+ /*
+ * Note: if changing the conditions under which scroll info layers
+ * are created, make a corresponding change to
+ * ScrollFrameWillBuildScrollInfoLayer() in nsSliderFrame.cpp.
+ */
+ for (nsIFrame* frame : mSVGEffectsFrames) {
+ if (SVGIntegrationUtils::UsesSVGEffectsNotSupportedInCompositor(frame)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+void nsDisplayListBuilder::AppendNewScrollInfoItemForHoisting(
+ nsDisplayScrollInfoLayer* aScrollInfoItem) {
+ MOZ_ASSERT(ShouldBuildScrollInfoItemsForHoisting());
+ MOZ_ASSERT(mScrollInfoItemsForHoisting);
+ mScrollInfoItemsForHoisting->AppendToTop(aScrollInfoItem);
+}
+
+void nsDisplayListBuilder::BuildCompositorHitTestInfoIfNeeded(
+ nsIFrame* aFrame, nsDisplayList* aList) {
+ MOZ_ASSERT(aFrame);
+ MOZ_ASSERT(aList);
+
+ if (!BuildCompositorHitTestInfo()) {
+ return;
+ }
+
+ const CompositorHitTestInfo info = aFrame->GetCompositorHitTestInfo(this);
+ if (info != CompositorHitTestInvisibleToHit) {
+ aList->AppendNewToTop<nsDisplayCompositorHitTestInfo>(this, aFrame);
+ }
+}
+
+void nsDisplayListBuilder::AddReusableDisplayItem(nsDisplayItem* aItem) {
+ mReuseableItems.Insert(aItem);
+}
+
+void nsDisplayListBuilder::RemoveReusedDisplayItem(nsDisplayItem* aItem) {
+ MOZ_ASSERT(aItem->IsReusedItem());
+ mReuseableItems.Remove(aItem);
+}
+
+void nsDisplayListBuilder::ClearReuseableDisplayItems() {
+ const size_t total = mReuseableItems.Count();
+
+ size_t reused = 0;
+ for (auto* item : mReuseableItems) {
+ if (item->IsReusedItem()) {
+ reused++;
+ item->SetReusable();
+ } else {
+ item->Destroy(this);
+ }
+ }
+
+ DL_LOGI("RDL - Reused %zu of %zu SC display items", reused, total);
+ mReuseableItems.Clear();
+}
+
+void nsDisplayListBuilder::ReuseDisplayItem(nsDisplayItem* aItem) {
+ const auto* previous = mCurrentContainerASR;
+ const auto* asr = aItem->GetActiveScrolledRoot();
+ mCurrentContainerASR =
+ ActiveScrolledRoot::PickAncestor(asr, mCurrentContainerASR);
+
+ if (previous != mCurrentContainerASR) {
+ DL_LOGV("RDL - Changed mCurrentContainerASR from %p to %p", previous,
+ mCurrentContainerASR);
+ }
+
+ aItem->SetReusedItem();
+}
+
+void nsDisplayListSet::CopyTo(const nsDisplayListSet& aDestination) const {
+ for (size_t i = 0; i < mLists.size(); ++i) {
+ auto* from = mLists[i];
+ auto* to = aDestination.mLists[i];
+
+ from->CopyTo(to);
+ }
+}
+
+void nsDisplayListSet::MoveTo(const nsDisplayListSet& aDestination) const {
+ aDestination.BorderBackground()->AppendToTop(BorderBackground());
+ aDestination.BlockBorderBackgrounds()->AppendToTop(BlockBorderBackgrounds());
+ aDestination.Floats()->AppendToTop(Floats());
+ aDestination.Content()->AppendToTop(Content());
+ aDestination.PositionedDescendants()->AppendToTop(PositionedDescendants());
+ aDestination.Outlines()->AppendToTop(Outlines());
+}
+
+nsRect nsDisplayList::GetClippedBounds(nsDisplayListBuilder* aBuilder) const {
+ nsRect bounds;
+ for (nsDisplayItem* i : *this) {
+ bounds.UnionRect(bounds, i->GetClippedBounds(aBuilder));
+ }
+ return bounds;
+}
+
+nsRect nsDisplayList::GetClippedBoundsWithRespectToASR(
+ nsDisplayListBuilder* aBuilder, const ActiveScrolledRoot* aASR,
+ nsRect* aBuildingRect) const {
+ nsRect bounds;
+ for (nsDisplayItem* i : *this) {
+ nsRect r = i->GetClippedBounds(aBuilder);
+ if (aASR != i->GetActiveScrolledRoot() && !r.IsEmpty()) {
+ if (Maybe<nsRect> clip = i->GetClipWithRespectToASR(aBuilder, aASR)) {
+ r = clip.ref();
+ }
+ }
+ if (aBuildingRect) {
+ aBuildingRect->UnionRect(*aBuildingRect, i->GetBuildingRect());
+ }
+ bounds.UnionRect(bounds, r);
+ }
+ return bounds;
+}
+
+nsRect nsDisplayList::GetBuildingRect() const {
+ nsRect result;
+ for (nsDisplayItem* i : *this) {
+ result.UnionRect(result, i->GetBuildingRect());
+ }
+ return result;
+}
+
+static void TriggerPendingAnimations(Document& aDoc,
+ const TimeStamp& aReadyTime) {
+ MOZ_ASSERT(!aReadyTime.IsNull(),
+ "Animation ready time is not set. Perhaps we're using a layer"
+ " manager that doesn't update it");
+ if (PendingAnimationTracker* tracker = aDoc.GetPendingAnimationTracker()) {
+ PresShell* presShell = aDoc.GetPresShell();
+ // If paint-suppression is in effect then we haven't finished painting
+ // this document yet so we shouldn't start animations
+ if (!presShell || !presShell->IsPaintingSuppressed()) {
+ tracker->TriggerPendingAnimationsOnNextTick(aReadyTime);
+ }
+ }
+ auto recurse = [&aReadyTime](Document& aDoc) {
+ TriggerPendingAnimations(aDoc, aReadyTime);
+ return CallState::Continue;
+ };
+ aDoc.EnumerateSubDocuments(recurse);
+}
+
+WindowRenderer* nsDisplayListBuilder::GetWidgetWindowRenderer(nsView** aView) {
+ if (aView) {
+ *aView = RootReferenceFrame()->GetView();
+ }
+ if (RootReferenceFrame() !=
+ nsLayoutUtils::GetDisplayRootFrame(RootReferenceFrame())) {
+ return nullptr;
+ }
+ nsIWidget* window = RootReferenceFrame()->GetNearestWidget();
+ if (window) {
+ return window->GetWindowRenderer();
+ }
+ return nullptr;
+}
+
+WebRenderLayerManager* nsDisplayListBuilder::GetWidgetLayerManager(
+ nsView** aView) {
+ WindowRenderer* renderer = GetWidgetWindowRenderer();
+ if (renderer) {
+ return renderer->AsWebRender();
+ }
+ return nullptr;
+}
+
+void nsDisplayList::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
+ int32_t aAppUnitsPerDevPixel) {
+ FlattenedDisplayListIterator iter(aBuilder, this);
+ while (iter.HasNext()) {
+ nsPaintedDisplayItem* item = iter.GetNextItem()->AsPaintedDisplayItem();
+ if (!item) {
+ continue;
+ }
+
+ nsRect visible = item->GetClippedBounds(aBuilder);
+ visible = visible.Intersect(item->GetPaintRect(aBuilder, aCtx));
+ if (visible.IsEmpty()) {
+ continue;
+ }
+
+ DisplayItemClip currentClip = item->GetClip();
+ if (currentClip.HasClip()) {
+ aCtx->Save();
+ if (currentClip.IsRectClippedByRoundedCorner(visible)) {
+ currentClip.ApplyTo(aCtx, aAppUnitsPerDevPixel);
+ } else {
+ currentClip.ApplyRectTo(aCtx, aAppUnitsPerDevPixel);
+ }
+ }
+ aCtx->NewPath();
+
+ item->Paint(aBuilder, aCtx);
+
+ if (currentClip.HasClip()) {
+ aCtx->Restore();
+ }
+ }
+}
+
+/**
+ * We paint by executing a layer manager transaction, constructing a
+ * single layer representing the display list, and then making it the
+ * root of the layer manager, drawing into the PaintedLayers.
+ */
+void nsDisplayList::PaintRoot(nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
+ uint32_t aFlags,
+ Maybe<double> aDisplayListBuildTime) {
+ AUTO_PROFILER_LABEL("nsDisplayList::PaintRoot", GRAPHICS);
+
+ RefPtr<WebRenderLayerManager> layerManager;
+ WindowRenderer* renderer = nullptr;
+ bool widgetTransaction = false;
+ bool doBeginTransaction = true;
+ nsView* view = nullptr;
+ if (aFlags & PAINT_USE_WIDGET_LAYERS) {
+ renderer = aBuilder->GetWidgetWindowRenderer(&view);
+ if (renderer) {
+ // The fallback renderer doesn't retain any content, so it's
+ // not meaningful to use it when drawing to an external context.
+ if (aCtx && renderer->AsFallback()) {
+ MOZ_ASSERT(!(aFlags & PAINT_EXISTING_TRANSACTION));
+ renderer = nullptr;
+ } else {
+ layerManager = renderer->AsWebRender();
+ doBeginTransaction = !(aFlags & PAINT_EXISTING_TRANSACTION);
+ widgetTransaction = true;
+ }
+ }
+ }
+
+ nsIFrame* frame = aBuilder->RootReferenceFrame();
+ nsPresContext* presContext = frame->PresContext();
+ PresShell* presShell = presContext->PresShell();
+ Document* document = presShell->GetDocument();
+
+ ScopeExit g([&]() {
+#ifdef DEBUG
+ MOZ_ASSERT(!layerManager || !layerManager->GetTarget());
+#endif
+
+ // For layers-free mode, we check the invalidation state bits in the
+ // EndTransaction. So we clear the invalidation state bits after
+ // EndTransaction.
+ if (widgetTransaction ||
+ // SVG-as-an-image docs don't paint as part of the retained layer tree,
+ // but they still need the invalidation state bits cleared in order for
+ // invalidation for CSS/SMIL animation to work properly.
+ (document && document->IsBeingUsedAsImage())) {
+ DL_LOGD("Clearing invalidation state bits");
+ frame->ClearInvalidationStateBits();
+ }
+ });
+
+ if (!renderer) {
+ if (!aCtx) {
+ NS_WARNING("Nowhere to paint into");
+ return;
+ }
+ bool prevIsCompositingCheap = aBuilder->SetIsCompositingCheap(false);
+ Paint(aBuilder, aCtx, presContext->AppUnitsPerDevPixel());
+
+ aBuilder->SetIsCompositingCheap(prevIsCompositingCheap);
+ return;
+ }
+
+ if (renderer->GetBackendType() == LayersBackend::LAYERS_WR) {
+ MOZ_ASSERT(layerManager);
+ if (doBeginTransaction) {
+ if (aCtx) {
+ if (!layerManager->BeginTransactionWithTarget(aCtx, nsCString())) {
+ return;
+ }
+ } else {
+ if (!layerManager->BeginTransaction(nsCString())) {
+ return;
+ }
+ }
+ }
+
+ bool prevIsCompositingCheap = aBuilder->SetIsCompositingCheap(true);
+ layerManager->SetTransactionIdAllocator(presContext->RefreshDriver());
+
+ bool sent = false;
+ if (aFlags & PAINT_IDENTICAL_DISPLAY_LIST) {
+ MOZ_ASSERT(!aCtx);
+ sent = layerManager->EndEmptyTransaction();
+ }
+
+ if (!sent) {
+ auto* wrManager = static_cast<WebRenderLayerManager*>(layerManager.get());
+
+ nsIDocShell* docShell = presContext->GetDocShell();
+ WrFiltersHolder wrFilters;
+ gfx::Matrix5x4* colorMatrix =
+ nsDocShell::Cast(docShell)->GetColorMatrix();
+ if (colorMatrix) {
+ wrFilters.filters.AppendElement(
+ wr::FilterOp::ColorMatrix(colorMatrix->components));
+ }
+
+ wrManager->EndTransactionWithoutLayer(this, aBuilder,
+ std::move(wrFilters), nullptr,
+ aDisplayListBuildTime.valueOr(0.0));
+ }
+
+ aBuilder->SetIsCompositingCheap(prevIsCompositingCheap);
+ if (document && widgetTransaction) {
+ TriggerPendingAnimations(*document,
+ layerManager->GetAnimationReadyTime());
+ }
+
+ if (presContext->RefreshDriver()->HasScheduleFlush()) {
+ presContext->NotifyInvalidation(layerManager->GetLastTransactionId(),
+ frame->GetRect());
+ }
+
+ return;
+ }
+
+ FallbackRenderer* fallback = renderer->AsFallback();
+ MOZ_ASSERT(fallback);
+
+ if (doBeginTransaction) {
+ MOZ_ASSERT(!aCtx);
+ if (!fallback->BeginTransaction()) {
+ return;
+ }
+ }
+
+ bool temp = aBuilder->SetIsCompositingCheap(renderer->IsCompositingCheap());
+ fallback->EndTransactionWithList(aBuilder, this,
+ presContext->AppUnitsPerDevPixel(),
+ WindowRenderer::END_DEFAULT);
+
+ aBuilder->SetIsCompositingCheap(temp);
+
+ if (document && widgetTransaction) {
+ TriggerPendingAnimations(*document, renderer->GetAnimationReadyTime());
+ }
+}
+
+void nsDisplayList::DeleteAll(nsDisplayListBuilder* aBuilder) {
+ for (auto* item : TakeItems()) {
+ item->Destroy(aBuilder);
+ }
+}
+
+static bool IsFrameReceivingPointerEvents(nsIFrame* aFrame) {
+ return aFrame->Style()->PointerEvents() != StylePointerEvents::None;
+}
+
+// A list of frames, and their z depth. Used for sorting
+// the results of hit testing.
+struct FramesWithDepth {
+ explicit FramesWithDepth(float aDepth) : mDepth(aDepth) {}
+
+ bool operator<(const FramesWithDepth& aOther) const {
+ if (!FuzzyEqual(mDepth, aOther.mDepth, 0.1f)) {
+ // We want to sort so that the shallowest item (highest depth value) is
+ // first
+ return mDepth > aOther.mDepth;
+ }
+ return this < &aOther;
+ }
+ bool operator==(const FramesWithDepth& aOther) const {
+ return this == &aOther;
+ }
+
+ float mDepth;
+ nsTArray<nsIFrame*> mFrames;
+};
+
+// Sort the frames by depth and then moves all the contained frames to the
+// destination
+static void FlushFramesArray(nsTArray<FramesWithDepth>& aSource,
+ nsTArray<nsIFrame*>* aDest) {
+ if (aSource.IsEmpty()) {
+ return;
+ }
+ aSource.Sort();
+ uint32_t length = aSource.Length();
+ for (uint32_t i = 0; i < length; i++) {
+ aDest->AppendElements(std::move(aSource[i].mFrames));
+ }
+ aSource.Clear();
+}
+
+void nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
+ nsDisplayItem::HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) const {
+ nsDisplayItem* item;
+
+ if (aState->mInPreserves3D) {
+ // Collect leaves of the current 3D rendering context.
+ for (nsDisplayItem* item : *this) {
+ auto itemType = item->GetType();
+ if (itemType != DisplayItemType::TYPE_TRANSFORM ||
+ !static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext()) {
+ item->HitTest(aBuilder, aRect, aState, aOutFrames);
+ } else {
+ // One of leaves in the current 3D rendering context.
+ aState->mItemBuffer.AppendElement(item);
+ }
+ }
+ return;
+ }
+
+ int32_t itemBufferStart = aState->mItemBuffer.Length();
+ for (nsDisplayItem* item : *this) {
+ aState->mItemBuffer.AppendElement(item);
+ }
+
+ AutoTArray<FramesWithDepth, 16> temp;
+ for (int32_t i = aState->mItemBuffer.Length() - 1; i >= itemBufferStart;
+ --i) {
+ // Pop element off the end of the buffer. We want to shorten the buffer
+ // so that recursive calls to HitTest have more buffer space.
+ item = aState->mItemBuffer[i];
+ aState->mItemBuffer.SetLength(i);
+
+ bool snap;
+ nsRect r = item->GetBounds(aBuilder, &snap).Intersect(aRect);
+ auto itemType = item->GetType();
+ bool same3DContext =
+ (itemType == DisplayItemType::TYPE_TRANSFORM &&
+ static_cast<nsDisplayTransform*>(item)->IsParticipating3DContext()) ||
+ (itemType == DisplayItemType::TYPE_PERSPECTIVE &&
+ item->Frame()->Extend3DContext());
+ if (same3DContext &&
+ (itemType != DisplayItemType::TYPE_TRANSFORM ||
+ !static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext())) {
+ if (!item->GetClip().MayIntersect(aRect)) {
+ continue;
+ }
+ AutoTArray<nsIFrame*, 1> neverUsed;
+ // Start gethering leaves of the 3D rendering context, and
+ // append leaves at the end of mItemBuffer. Leaves are
+ // processed at following iterations.
+ aState->mInPreserves3D = true;
+ item->HitTest(aBuilder, aRect, aState, &neverUsed);
+ aState->mInPreserves3D = false;
+ i = aState->mItemBuffer.Length();
+ continue;
+ }
+ if (same3DContext || item->GetClip().MayIntersect(r)) {
+ AutoTArray<nsIFrame*, 16> outFrames;
+ item->HitTest(aBuilder, aRect, aState, &outFrames);
+
+ // For 3d transforms with preserve-3d we add hit frames into the temp list
+ // so we can sort them later, otherwise we add them directly to the output
+ // list.
+ nsTArray<nsIFrame*>* writeFrames = aOutFrames;
+ if (item->GetType() == DisplayItemType::TYPE_TRANSFORM &&
+ static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext()) {
+ if (outFrames.Length()) {
+ nsDisplayTransform* transform =
+ static_cast<nsDisplayTransform*>(item);
+ nsPoint point = aRect.TopLeft();
+ // A 1x1 rect means a point, otherwise use the center of the rect
+ if (aRect.width != 1 || aRect.height != 1) {
+ point = aRect.Center();
+ }
+ temp.AppendElement(
+ FramesWithDepth(transform->GetHitDepthAtPoint(aBuilder, point)));
+ writeFrames = &temp[temp.Length() - 1].mFrames;
+ }
+ } else {
+ // We may have just finished a run of consecutive preserve-3d
+ // transforms, so flush these into the destination array before
+ // processing our frame list.
+ FlushFramesArray(temp, aOutFrames);
+ }
+
+ for (uint32_t j = 0; j < outFrames.Length(); j++) {
+ nsIFrame* f = outFrames.ElementAt(j);
+ // Filter out some frames depending on the type of hittest
+ // we are doing. For visibility tests, pass through all frames.
+ // For pointer tests, only pass through frames that are styled
+ // to receive pointer events.
+ if (aBuilder->HitTestIsForVisibility() ||
+ IsFrameReceivingPointerEvents(f)) {
+ writeFrames->AppendElement(f);
+ }
+ }
+
+ if (aBuilder->HitTestIsForVisibility()) {
+ aState->mHitOccludingItem = [&] {
+ if (aState->mHitOccludingItem) {
+ // We already hit something before.
+ return true;
+ }
+ if (aState->mCurrentOpacity == 1.0f &&
+ item->GetOpaqueRegion(aBuilder, &snap).Contains(aRect)) {
+ // An opaque item always occludes everything. Note that we need to
+ // check wrapping opacity and such as well.
+ return true;
+ }
+ float threshold = aBuilder->VisibilityThreshold();
+ if (threshold == 1.0f) {
+ return false;
+ }
+ float itemOpacity = [&] {
+ switch (item->GetType()) {
+ case DisplayItemType::TYPE_OPACITY:
+ return static_cast<nsDisplayOpacity*>(item)->GetOpacity();
+ case DisplayItemType::TYPE_BACKGROUND_COLOR:
+ return static_cast<nsDisplayBackgroundColor*>(item)
+ ->GetOpacity();
+ default:
+ // Be conservative and assume it won't occlude other items.
+ return 0.0f;
+ }
+ }();
+ return itemOpacity * aState->mCurrentOpacity >= threshold;
+ }();
+
+ if (aState->mHitOccludingItem) {
+ // We're exiting early, so pop the remaining items off the buffer.
+ aState->mItemBuffer.TruncateLength(itemBufferStart);
+ break;
+ }
+ }
+ }
+ }
+ // Clear any remaining preserve-3d transforms.
+ FlushFramesArray(temp, aOutFrames);
+ NS_ASSERTION(aState->mItemBuffer.Length() == uint32_t(itemBufferStart),
+ "How did we forget to pop some elements?");
+}
+
+static nsIContent* FindContentInDocument(nsDisplayItem* aItem, Document* aDoc) {
+ nsIFrame* f = aItem->Frame();
+ while (f) {
+ nsPresContext* pc = f->PresContext();
+ if (pc->Document() == aDoc) {
+ return f->GetContent();
+ }
+ f = nsLayoutUtils::GetCrossDocParentFrameInProcess(
+ pc->PresShell()->GetRootFrame());
+ }
+ return nullptr;
+}
+
+struct ZSortItem {
+ nsDisplayItem* item;
+ int32_t zIndex;
+
+ explicit ZSortItem(nsDisplayItem* aItem)
+ : item(aItem), zIndex(aItem->ZIndex()) {}
+
+ operator nsDisplayItem*() { return item; }
+};
+
+struct ZOrderComparator {
+ bool operator()(const ZSortItem& aLeft, const ZSortItem& aRight) const {
+ // Note that we can't just take the difference of the two
+ // z-indices here, because that might overflow a 32-bit int.
+ return aLeft.zIndex < aRight.zIndex;
+ }
+};
+
+void nsDisplayList::SortByZOrder() { Sort<ZSortItem>(ZOrderComparator()); }
+
+struct ContentComparator {
+ nsIContent* mCommonAncestor;
+
+ explicit ContentComparator(nsIContent* aCommonAncestor)
+ : mCommonAncestor(aCommonAncestor) {}
+
+ bool operator()(nsDisplayItem* aLeft, nsDisplayItem* aRight) const {
+ // It's possible that the nsIContent for aItem1 or aItem2 is in a
+ // subdocument of commonAncestor, because display items for subdocuments
+ // have been mixed into the same list. Ensure that we're looking at content
+ // in commonAncestor's document.
+ Document* commonAncestorDoc = mCommonAncestor->OwnerDoc();
+ nsIContent* content1 = FindContentInDocument(aLeft, commonAncestorDoc);
+ nsIContent* content2 = FindContentInDocument(aRight, commonAncestorDoc);
+ if (!content1 || !content2) {
+ NS_ERROR("Document trees are mixed up!");
+ // Something weird going on
+ return true;
+ }
+ return nsLayoutUtils::CompareTreePosition(content1, content2,
+ mCommonAncestor) < 0;
+ }
+};
+
+void nsDisplayList::SortByContentOrder(nsIContent* aCommonAncestor) {
+ Sort<nsDisplayItem*>(ContentComparator(aCommonAncestor));
+}
+
+#if !defined(DEBUG) && !defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
+static_assert(sizeof(nsDisplayItem) <= 176, "nsDisplayItem has grown");
+#endif
+
+nsDisplayItem::nsDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
+ : nsDisplayItem(aBuilder, aFrame, aBuilder->CurrentActiveScrolledRoot()) {}
+
+nsDisplayItem::nsDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ const ActiveScrolledRoot* aActiveScrolledRoot)
+ : mFrame(aFrame), mActiveScrolledRoot(aActiveScrolledRoot) {
+ MOZ_COUNT_CTOR(nsDisplayItem);
+ MOZ_ASSERT(mFrame);
+ if (aBuilder->IsRetainingDisplayList()) {
+ mFrame->AddDisplayItem(this);
+ }
+
+ aBuilder->FindReferenceFrameFor(aFrame, &mToReferenceFrame);
+ NS_ASSERTION(
+ aBuilder->GetVisibleRect().width >= 0 || !aBuilder->IsForPainting(),
+ "visible rect not set");
+
+ mClipChain = aBuilder->ClipState().GetCurrentCombinedClipChain(aBuilder);
+
+ // The visible rect is for mCurrentFrame, so we have to use
+ // mCurrentOffsetToReferenceFrame
+ nsRect visible = aBuilder->GetVisibleRect() +
+ aBuilder->GetCurrentFrameOffsetToReferenceFrame();
+ SetBuildingRect(visible);
+
+ const nsStyleDisplay* disp = mFrame->StyleDisplay();
+ if (mFrame->BackfaceIsHidden(disp)) {
+ mItemFlags += ItemFlag::BackfaceHidden;
+ }
+ if (mFrame->Combines3DTransformWithAncestors()) {
+ mItemFlags += ItemFlag::Combines3DTransformWithAncestors;
+ }
+}
+
+void nsDisplayItem::SetDeletedFrame() { mItemFlags += ItemFlag::DeletedFrame; }
+
+bool nsDisplayItem::HasDeletedFrame() const {
+ bool retval = mItemFlags.contains(ItemFlag::DeletedFrame) ||
+ (GetType() == DisplayItemType::TYPE_REMOTE &&
+ !static_cast<const nsDisplayRemote*>(this)->GetFrameLoader());
+ MOZ_ASSERT(retval || mFrame);
+ return retval;
+}
+
+/* static */
+bool nsDisplayItem::ForceActiveLayers() {
+ return StaticPrefs::layers_force_active();
+}
+
+int32_t nsDisplayItem::ZIndex() const { return mFrame->ZIndex().valueOr(0); }
+
+void nsDisplayItem::SetClipChain(const DisplayItemClipChain* aClipChain,
+ bool aStore) {
+ mClipChain = aClipChain;
+}
+
+Maybe<nsRect> nsDisplayItem::GetClipWithRespectToASR(
+ nsDisplayListBuilder* aBuilder, const ActiveScrolledRoot* aASR) const {
+ if (const DisplayItemClip* clip =
+ DisplayItemClipChain::ClipForASR(GetClipChain(), aASR)) {
+ return Some(clip->GetClipRect());
+ }
+#ifdef DEBUG
+ NS_ASSERTION(false, "item should have finite clip with respect to aASR");
+#endif
+ return Nothing();
+}
+
+const DisplayItemClip& nsDisplayItem::GetClip() const {
+ const DisplayItemClip* clip =
+ DisplayItemClipChain::ClipForASR(mClipChain, mActiveScrolledRoot);
+ return clip ? *clip : DisplayItemClip::NoClip();
+}
+
+void nsDisplayItem::IntersectClip(nsDisplayListBuilder* aBuilder,
+ const DisplayItemClipChain* aOther,
+ bool aStore) {
+ if (!aOther || mClipChain == aOther) {
+ return;
+ }
+
+ // aOther might be a reference to a clip on the stack. We need to make sure
+ // that CreateClipChainIntersection will allocate the actual intersected
+ // clip in the builder's arena, so for the mClipChain == nullptr case,
+ // we supply nullptr as the common ancestor so that
+ // CreateClipChainIntersection clones the whole chain.
+ const DisplayItemClipChain* ancestorClip =
+ mClipChain ? FindCommonAncestorClipForIntersection(mClipChain, aOther)
+ : nullptr;
+
+ SetClipChain(
+ aBuilder->CreateClipChainIntersection(ancestorClip, mClipChain, aOther),
+ aStore);
+}
+
+nsRect nsDisplayItem::GetClippedBounds(nsDisplayListBuilder* aBuilder) const {
+ bool snap;
+ nsRect r = GetBounds(aBuilder, &snap);
+ return GetClip().ApplyNonRoundedIntersection(r);
+}
+
+nsDisplayContainer::nsDisplayContainer(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ const ActiveScrolledRoot* aActiveScrolledRoot, nsDisplayList* aList)
+ : nsDisplayItem(aBuilder, aFrame, aActiveScrolledRoot),
+ mChildren(aBuilder) {
+ MOZ_COUNT_CTOR(nsDisplayContainer);
+ mChildren.AppendToTop(aList);
+ UpdateBounds(aBuilder);
+
+ // Clear and store the clip chain set by nsDisplayItem constructor.
+ nsDisplayItem::SetClipChain(nullptr, true);
+}
+
+nsRect nsDisplayItem::GetPaintRect(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ bool dummy;
+ nsRect result = GetBounds(aBuilder, &dummy);
+ if (aCtx) {
+ result.IntersectRect(result,
+ nsLayoutUtils::RoundGfxRectToAppRect(
+ aCtx->GetClipExtents(),
+ mFrame->PresContext()->AppUnitsPerDevPixel()));
+ }
+ return result;
+}
+
+bool nsDisplayContainer::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
+ GetChildren(), this, aDisplayListBuilder, aSc, aBuilder, aResources,
+ false);
+ return true;
+}
+
+nsRect nsDisplayContainer::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ return mBounds;
+}
+
+nsRect nsDisplayContainer::GetComponentAlphaBounds(
+ nsDisplayListBuilder* aBuilder) const {
+ return mChildren.GetComponentAlphaBounds(aBuilder);
+}
+
+static nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ nsDisplayList* aList,
+ const nsRect& aListBounds) {
+ return aList->GetOpaqueRegion(aBuilder);
+}
+
+nsRegion nsDisplayContainer::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ return ::mozilla::GetOpaqueRegion(aBuilder, GetChildren(),
+ GetBounds(aBuilder, aSnap));
+}
+
+Maybe<nsRect> nsDisplayContainer::GetClipWithRespectToASR(
+ nsDisplayListBuilder* aBuilder, const ActiveScrolledRoot* aASR) const {
+ // Our children should have finite bounds with respect to |aASR|.
+ if (aASR == mActiveScrolledRoot) {
+ return Some(mBounds);
+ }
+
+ return Some(mChildren.GetClippedBoundsWithRespectToASR(aBuilder, aASR));
+}
+
+void nsDisplayContainer::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect, HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ mChildren.HitTest(aBuilder, aRect, aState, aOutFrames);
+}
+
+void nsDisplayContainer::UpdateBounds(nsDisplayListBuilder* aBuilder) {
+ // Container item bounds are expected to be clipped.
+ mBounds =
+ mChildren.GetClippedBoundsWithRespectToASR(aBuilder, mActiveScrolledRoot);
+}
+
+nsRect nsDisplaySolidColor::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = true;
+ return mBounds;
+}
+
+void nsDisplaySolidColor::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+ DrawTarget* drawTarget = aCtx->GetDrawTarget();
+ Rect rect = NSRectToSnappedRect(GetPaintRect(aBuilder, aCtx),
+ appUnitsPerDevPixel, *drawTarget);
+ drawTarget->FillRect(rect, ColorPattern(ToDeviceColor(mColor)));
+}
+
+void nsDisplaySolidColor::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << " (rgba " << (int)NS_GET_R(mColor) << "," << (int)NS_GET_G(mColor)
+ << "," << (int)NS_GET_B(mColor) << "," << (int)NS_GET_A(mColor)
+ << ")";
+}
+
+bool nsDisplaySolidColor::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
+ mBounds, mFrame->PresContext()->AppUnitsPerDevPixel());
+ wr::LayoutRect r = wr::ToLayoutRect(bounds);
+ aBuilder.PushRect(r, r, !BackfaceIsHidden(), false, mIsCheckerboardBackground,
+ wr::ToColorF(ToDeviceColor(mColor)));
+
+ return true;
+}
+
+nsRect nsDisplaySolidColorRegion::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = true;
+ return mRegion.GetBounds();
+}
+
+void nsDisplaySolidColorRegion::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+ DrawTarget* drawTarget = aCtx->GetDrawTarget();
+ ColorPattern color(ToDeviceColor(mColor));
+ for (auto iter = mRegion.RectIter(); !iter.Done(); iter.Next()) {
+ Rect rect =
+ NSRectToSnappedRect(iter.Get(), appUnitsPerDevPixel, *drawTarget);
+ drawTarget->FillRect(rect, color);
+ }
+}
+
+void nsDisplaySolidColorRegion::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << " (rgba " << int(mColor.r * 255) << "," << int(mColor.g * 255)
+ << "," << int(mColor.b * 255) << "," << mColor.a << ")";
+}
+
+bool nsDisplaySolidColorRegion::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ for (auto iter = mRegion.RectIter(); !iter.Done(); iter.Next()) {
+ nsRect rect = iter.Get();
+ LayoutDeviceRect layerRects = LayoutDeviceRect::FromAppUnits(
+ rect, mFrame->PresContext()->AppUnitsPerDevPixel());
+ wr::LayoutRect r = wr::ToLayoutRect(layerRects);
+ aBuilder.PushRect(r, r, !BackfaceIsHidden(), false, false,
+ wr::ToColorF(ToDeviceColor(mColor)));
+ }
+
+ return true;
+}
+
+static void RegisterThemeGeometry(nsDisplayListBuilder* aBuilder,
+ nsDisplayItem* aItem, nsIFrame* aFrame,
+ nsITheme::ThemeGeometryType aType) {
+ if (aBuilder->IsInChromeDocumentOrPopup()) {
+ nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(aFrame);
+ bool preservesAxisAlignedRectangles = false;
+ nsRect borderBox = nsLayoutUtils::TransformFrameRectToAncestor(
+ aFrame, aFrame->GetRectRelativeToSelf(), displayRoot,
+ &preservesAxisAlignedRectangles);
+ if (preservesAxisAlignedRectangles) {
+ aBuilder->RegisterThemeGeometry(
+ aType, aItem,
+ LayoutDeviceIntRect::FromUnknownRect(borderBox.ToNearestPixels(
+ aFrame->PresContext()->AppUnitsPerDevPixel())));
+ }
+ }
+}
+
+// Return the bounds of the viewport relative to |aFrame|'s reference frame.
+// Returns Nothing() if transforming into |aFrame|'s coordinate space fails.
+static Maybe<nsRect> GetViewportRectRelativeToReferenceFrame(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) {
+ nsIFrame* rootFrame = aFrame->PresShell()->GetRootFrame();
+ nsRect rootRect = rootFrame->GetRectRelativeToSelf();
+ if (nsLayoutUtils::TransformRect(rootFrame, aFrame, rootRect) ==
+ nsLayoutUtils::TRANSFORM_SUCCEEDED) {
+ return Some(rootRect + aBuilder->ToReferenceFrame(aFrame));
+ }
+ return Nothing();
+}
+
+/* static */ nsDisplayBackgroundImage::InitData
+nsDisplayBackgroundImage::GetInitData(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, uint16_t aLayer,
+ const nsRect& aBackgroundRect,
+ const ComputedStyle* aBackgroundStyle) {
+ nsPresContext* presContext = aFrame->PresContext();
+ uint32_t flags = aBuilder->GetBackgroundPaintFlags();
+ const nsStyleImageLayers::Layer& layer =
+ aBackgroundStyle->StyleBackground()->mImage.mLayers[aLayer];
+
+ bool isTransformedFixed;
+ nsBackgroundLayerState state = nsCSSRendering::PrepareImageLayer(
+ presContext, aFrame, flags, aBackgroundRect, aBackgroundRect, layer,
+ &isTransformedFixed);
+
+ // background-attachment:fixed is treated as background-attachment:scroll
+ // if it's affected by a transform.
+ // See https://www.w3.org/Bugs/Public/show_bug.cgi?id=17521.
+ bool shouldTreatAsFixed =
+ layer.mAttachment == StyleImageLayerAttachment::Fixed &&
+ !isTransformedFixed;
+
+ bool shouldFixToViewport = shouldTreatAsFixed && !layer.mImage.IsNone();
+ bool isRasterImage = state.mImageRenderer.IsRasterImage();
+ nsCOMPtr<imgIContainer> image;
+ if (isRasterImage) {
+ image = state.mImageRenderer.GetImage();
+ }
+ return InitData{aBuilder, aBackgroundStyle, image,
+ aBackgroundRect, state.mFillArea, state.mDestArea,
+ aLayer, isRasterImage, shouldFixToViewport};
+}
+
+nsDisplayBackgroundImage::nsDisplayBackgroundImage(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, const InitData& aInitData,
+ nsIFrame* aFrameForBounds)
+ : nsPaintedDisplayItem(aBuilder, aFrame),
+ mBackgroundStyle(aInitData.backgroundStyle),
+ mImage(aInitData.image),
+ mDependentFrame(nullptr),
+ mBackgroundRect(aInitData.backgroundRect),
+ mFillRect(aInitData.fillArea),
+ mDestRect(aInitData.destArea),
+ mLayer(aInitData.layer),
+ mIsRasterImage(aInitData.isRasterImage),
+ mShouldFixToViewport(aInitData.shouldFixToViewport) {
+ MOZ_COUNT_CTOR(nsDisplayBackgroundImage);
+#ifdef DEBUG
+ if (mBackgroundStyle && mBackgroundStyle != mFrame->Style()) {
+ // If this changes, then you also need to adjust css::ImageLoader to
+ // invalidate mFrame as needed.
+ MOZ_ASSERT(mFrame->IsCanvasFrame() ||
+ mFrame->IsFrameOfType(nsIFrame::eTablePart));
+ }
+#endif
+
+ mBounds = GetBoundsInternal(aInitData.builder, aFrameForBounds);
+ if (mShouldFixToViewport) {
+ // Expand the item's visible rect to cover the entire bounds, limited to the
+ // viewport rect. This is necessary because the background's clip can move
+ // asynchronously.
+ if (Maybe<nsRect> viewportRect = GetViewportRectRelativeToReferenceFrame(
+ aInitData.builder, mFrame)) {
+ SetBuildingRect(mBounds.Intersect(*viewportRect));
+ }
+ }
+}
+
+nsDisplayBackgroundImage::~nsDisplayBackgroundImage() {
+ MOZ_COUNT_DTOR(nsDisplayBackgroundImage);
+ if (mDependentFrame) {
+ mDependentFrame->RemoveDisplayItem(this);
+ }
+}
+
+static void SetBackgroundClipRegion(
+ DisplayListClipState::AutoSaveRestore& aClipState, nsIFrame* aFrame,
+ const nsStyleImageLayers::Layer& aLayer, const nsRect& aBackgroundRect,
+ bool aWillPaintBorder) {
+ nsCSSRendering::ImageLayerClipState clip;
+ nsCSSRendering::GetImageLayerClip(
+ aLayer, aFrame, *aFrame->StyleBorder(), aBackgroundRect, aBackgroundRect,
+ aWillPaintBorder, aFrame->PresContext()->AppUnitsPerDevPixel(), &clip);
+
+ if (clip.mHasAdditionalBGClipArea) {
+ aClipState.ClipContentDescendants(
+ clip.mAdditionalBGClipArea, clip.mBGClipArea,
+ clip.mHasRoundedCorners ? clip.mRadii : nullptr);
+ } else {
+ aClipState.ClipContentDescendants(
+ clip.mBGClipArea, clip.mHasRoundedCorners ? clip.mRadii : nullptr);
+ }
+}
+
+/**
+ * This is used for the find bar highlighter overlay. It's only accessible
+ * through the AnonymousContent API, so it's not exposed to general web pages.
+ */
+static bool SpecialCutoutRegionCase(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame,
+ const nsRect& aBackgroundRect,
+ nsDisplayList* aList, nscolor aColor) {
+ nsIContent* content = aFrame->GetContent();
+ if (!content) {
+ return false;
+ }
+
+ void* cutoutRegion = content->GetProperty(nsGkAtoms::cutoutregion);
+ if (!cutoutRegion) {
+ return false;
+ }
+
+ if (NS_GET_A(aColor) == 0) {
+ return true;
+ }
+
+ nsRegion region;
+ region.Sub(aBackgroundRect, *static_cast<nsRegion*>(cutoutRegion));
+ region.MoveBy(aBuilder->ToReferenceFrame(aFrame));
+ aList->AppendNewToTop<nsDisplaySolidColorRegion>(aBuilder, aFrame, region,
+ aColor);
+
+ return true;
+}
+
+enum class TableType : uint8_t {
+ Table,
+ TableCol,
+ TableColGroup,
+ TableRow,
+ TableRowGroup,
+ TableCell,
+
+ MAX,
+};
+
+enum class TableTypeBits : uint8_t { Count = 3 };
+
+static_assert(static_cast<uint8_t>(TableType::MAX) <
+ (1 << (static_cast<uint8_t>(TableTypeBits::Count) + 1)),
+ "TableType cannot fit with TableTypeBits::Count");
+TableType GetTableTypeFromFrame(nsIFrame* aFrame);
+
+static uint16_t CalculateTablePerFrameKey(const uint16_t aIndex,
+ const TableType aType) {
+ const uint32_t key = (aIndex << static_cast<uint8_t>(TableTypeBits::Count)) |
+ static_cast<uint8_t>(aType);
+
+ return static_cast<uint16_t>(key);
+}
+
+static nsDisplayBackgroundImage* CreateBackgroundImage(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
+ const nsDisplayBackgroundImage::InitData& aBgData) {
+ const auto index = aBgData.layer;
+
+ if (aSecondaryFrame) {
+ const auto tableType = GetTableTypeFromFrame(aFrame);
+ const uint16_t tableItemIndex = CalculateTablePerFrameKey(index, tableType);
+
+ return MakeDisplayItemWithIndex<nsDisplayTableBackgroundImage>(
+ aBuilder, aSecondaryFrame, tableItemIndex, aBgData, aFrame);
+ }
+
+ return MakeDisplayItemWithIndex<nsDisplayBackgroundImage>(aBuilder, aFrame,
+ index, aBgData);
+}
+
+static nsDisplayThemedBackground* CreateThemedBackground(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
+ const nsRect& aBgRect) {
+ if (aSecondaryFrame) {
+ const uint16_t index = static_cast<uint16_t>(GetTableTypeFromFrame(aFrame));
+ return MakeDisplayItemWithIndex<nsDisplayTableThemedBackground>(
+ aBuilder, aSecondaryFrame, index, aBgRect, aFrame);
+ }
+
+ return MakeDisplayItem<nsDisplayThemedBackground>(aBuilder, aFrame, aBgRect);
+}
+
+static nsDisplayBackgroundColor* CreateBackgroundColor(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
+ nsRect& aBgRect, const ComputedStyle* aBgSC, nscolor aColor) {
+ if (aSecondaryFrame) {
+ const uint16_t index = static_cast<uint16_t>(GetTableTypeFromFrame(aFrame));
+ return MakeDisplayItemWithIndex<nsDisplayTableBackgroundColor>(
+ aBuilder, aSecondaryFrame, index, aBgRect, aBgSC, aColor, aFrame);
+ }
+
+ return MakeDisplayItem<nsDisplayBackgroundColor>(aBuilder, aFrame, aBgRect,
+ aBgSC, aColor);
+}
+
+static void DealWithWindowsAppearanceHacks(nsIFrame* aFrame,
+ nsDisplayListBuilder* aBuilder) {
+ const auto& disp = *aFrame->StyleDisplay();
+
+ // We use default appearance rather than effective appearance because we want
+ // to handle when titlebar buttons that have appearance: none.
+ const auto defaultAppearance = disp.mDefaultAppearance;
+ if (MOZ_LIKELY(defaultAppearance == StyleAppearance::None)) {
+ return;
+ }
+
+ if (defaultAppearance == StyleAppearance::MozWinExcludeGlass) {
+ // Check for frames that are marked as a part of the region used in
+ // calculating glass margins on Windows.
+ aBuilder->AddWindowExcludeGlassRegion(
+ aFrame, nsRect(aBuilder->ToReferenceFrame(aFrame), aFrame->GetSize()));
+ }
+
+ if (auto type = disp.GetWindowButtonType()) {
+ if (auto* widget = aFrame->GetNearestWidget()) {
+ auto rect = LayoutDevicePixel::FromAppUnitsToNearest(
+ nsRect(aBuilder->ToReferenceFrame(aFrame), aFrame->GetSize()),
+ aFrame->PresContext()->AppUnitsPerDevPixel());
+ widget->SetWindowButtonRect(*type, rect);
+ }
+ }
+}
+
+/*static*/
+AppendedBackgroundType nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ const nsRect& aBackgroundRect, nsDisplayList* aList,
+ bool aAllowWillPaintBorderOptimization, const nsRect& aBackgroundOriginRect,
+ nsIFrame* aSecondaryReferenceFrame,
+ Maybe<nsDisplayListBuilder::AutoBuildingDisplayList>*
+ aAutoBuildingDisplayList) {
+ MOZ_ASSERT(!aFrame->IsCanvasFrame(),
+ "We don't expect propagated canvas backgrounds here");
+#ifdef DEBUG
+ {
+ nsIFrame* bgFrame = nsCSSRendering::FindBackgroundFrame(aFrame);
+ MOZ_ASSERT(
+ !bgFrame || bgFrame == aFrame,
+ "Should only suppress backgrounds, never propagate to another frame");
+ }
+#endif
+
+ DealWithWindowsAppearanceHacks(aFrame, aBuilder);
+
+ const bool isThemed = aFrame->IsThemed();
+
+ const ComputedStyle* bgSC = aFrame->Style();
+ const nsStyleBackground* bg = bgSC->StyleBackground();
+ const bool needsBackgroundColor =
+ aBuilder->IsForEventDelivery() ||
+ (EffectCompositor::HasAnimationsForCompositor(
+ aFrame, DisplayItemType::TYPE_BACKGROUND_COLOR) &&
+ !isThemed);
+ if (!needsBackgroundColor && !isThemed && bg->IsTransparent(bgSC)) {
+ return AppendedBackgroundType::None;
+ }
+
+ bool drawBackgroundColor = false;
+ bool drawBackgroundImage = false;
+ nscolor color = NS_RGBA(0, 0, 0, 0);
+ // Don't get background color / images if we propagated our background to the
+ // canvas (that is, if FindBackgroundFrame is null). But don't early return
+ // yet, since we might still need a background-color item for hit-testing.
+ if (!isThemed && nsCSSRendering::FindBackgroundFrame(aFrame)) {
+ color = nsCSSRendering::DetermineBackgroundColor(
+ aFrame->PresContext(), bgSC, aFrame, drawBackgroundImage,
+ drawBackgroundColor);
+ }
+
+ if (SpecialCutoutRegionCase(aBuilder, aFrame, aBackgroundRect, aList,
+ color)) {
+ return AppendedBackgroundType::None;
+ }
+
+ const nsStyleBorder& border = *aFrame->StyleBorder();
+ const bool willPaintBorder =
+ aAllowWillPaintBorderOptimization && !isThemed &&
+ !aFrame->StyleEffects()->HasBoxShadowWithInset(true) &&
+ border.HasBorder();
+
+ auto EnsureBuildingDisplayList = [&] {
+ if (!aAutoBuildingDisplayList || *aAutoBuildingDisplayList) {
+ return;
+ }
+ nsPoint offset = aBuilder->GetCurrentFrame()->GetOffsetTo(aFrame);
+ aAutoBuildingDisplayList->emplace(aBuilder, aFrame,
+ aBuilder->GetVisibleRect() + offset,
+ aBuilder->GetDirtyRect() + offset);
+ };
+
+ // An auxiliary list is necessary in case we have background blending; if that
+ // is the case, background items need to be wrapped by a blend container to
+ // isolate blending to the background
+ nsDisplayList bgItemList(aBuilder);
+ // Even if we don't actually have a background color to paint, we may still
+ // need to create an item for hit testing and we still need to create an item
+ // for background-color animations.
+ if ((drawBackgroundColor && color != NS_RGBA(0, 0, 0, 0)) ||
+ needsBackgroundColor) {
+ EnsureBuildingDisplayList();
+ Maybe<DisplayListClipState::AutoSaveRestore> clipState;
+ nsRect bgColorRect = aBackgroundRect;
+ if (!isThemed && !aBuilder->IsForEventDelivery()) {
+ // Disable the will-paint-border optimization for background
+ // colors with no border-radius. Enabling it for background colors
+ // doesn't help much (there are no tiling issues) and clipping the
+ // background breaks detection of the element's border-box being
+ // opaque. For nonzero border-radius we still need it because we
+ // want to inset the background if possible to avoid antialiasing
+ // artifacts along the rounded corners.
+ const bool useWillPaintBorderOptimization =
+ willPaintBorder &&
+ nsLayoutUtils::HasNonZeroCorner(border.mBorderRadius);
+
+ nsCSSRendering::ImageLayerClipState clip;
+ nsCSSRendering::GetImageLayerClip(
+ bg->BottomLayer(), aFrame, border, aBackgroundRect, aBackgroundRect,
+ useWillPaintBorderOptimization,
+ aFrame->PresContext()->AppUnitsPerDevPixel(), &clip);
+
+ bgColorRect = bgColorRect.Intersect(clip.mBGClipArea);
+ if (clip.mHasAdditionalBGClipArea) {
+ bgColorRect = bgColorRect.Intersect(clip.mAdditionalBGClipArea);
+ }
+ if (clip.mHasRoundedCorners) {
+ clipState.emplace(aBuilder);
+ clipState->ClipContentDescendants(clip.mBGClipArea, clip.mRadii);
+ }
+ }
+
+ nsDisplayBackgroundColor* bgItem = CreateBackgroundColor(
+ aBuilder, aFrame, aSecondaryReferenceFrame, bgColorRect, bgSC,
+ drawBackgroundColor ? color : NS_RGBA(0, 0, 0, 0));
+
+ if (bgItem) {
+ bgItemList.AppendToTop(bgItem);
+ }
+ }
+
+ if (isThemed) {
+ nsDisplayThemedBackground* bgItem = CreateThemedBackground(
+ aBuilder, aFrame, aSecondaryReferenceFrame, aBackgroundRect);
+
+ if (bgItem) {
+ bgItem->Init(aBuilder);
+ bgItemList.AppendToTop(bgItem);
+ }
+
+ if (!bgItemList.IsEmpty()) {
+ aList->AppendToTop(&bgItemList);
+ return AppendedBackgroundType::ThemedBackground;
+ }
+
+ return AppendedBackgroundType::None;
+ }
+
+ if (!drawBackgroundImage) {
+ if (!bgItemList.IsEmpty()) {
+ aList->AppendToTop(&bgItemList);
+ return AppendedBackgroundType::Background;
+ }
+
+ return AppendedBackgroundType::None;
+ }
+
+ const ActiveScrolledRoot* asr = aBuilder->CurrentActiveScrolledRoot();
+
+ bool needBlendContainer = false;
+ const nsRect& bgOriginRect =
+ aBackgroundOriginRect.IsEmpty() ? aBackgroundRect : aBackgroundOriginRect;
+
+ // Passing bg == nullptr in this macro will result in one iteration with
+ // i = 0.
+ NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, bg->mImage) {
+ if (bg->mImage.mLayers[i].mImage.IsNone()) {
+ continue;
+ }
+
+ EnsureBuildingDisplayList();
+
+ if (bg->mImage.mLayers[i].mBlendMode != StyleBlend::Normal) {
+ needBlendContainer = true;
+ }
+
+ DisplayListClipState::AutoSaveRestore clipState(aBuilder);
+ if (!aBuilder->IsForEventDelivery()) {
+ const nsStyleImageLayers::Layer& layer = bg->mImage.mLayers[i];
+ SetBackgroundClipRegion(clipState, aFrame, layer, aBackgroundRect,
+ willPaintBorder);
+ }
+
+ nsDisplayList thisItemList(aBuilder);
+ nsDisplayBackgroundImage::InitData bgData =
+ nsDisplayBackgroundImage::GetInitData(aBuilder, aFrame, i, bgOriginRect,
+ bgSC);
+
+ if (bgData.shouldFixToViewport) {
+ auto* displayData = aBuilder->GetCurrentFixedBackgroundDisplayData();
+ nsDisplayListBuilder::AutoBuildingDisplayList buildingDisplayList(
+ aBuilder, aFrame, aBuilder->GetVisibleRect(),
+ aBuilder->GetDirtyRect());
+
+ nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter asrSetter(
+ aBuilder);
+ if (displayData) {
+ asrSetter.SetCurrentActiveScrolledRoot(
+ displayData->mContainingBlockActiveScrolledRoot);
+ asrSetter.SetCurrentScrollParentId(displayData->mScrollParentId);
+ if (nsLayoutUtils::UsesAsyncScrolling(aFrame)) {
+ // Override the dirty rect on the builder to be the dirty rect of
+ // the viewport.
+ // displayData->mDirtyRect is relative to the presshell's viewport
+ // frame (the root frame), and we need it to be relative to aFrame.
+ nsIFrame* rootFrame =
+ aBuilder->CurrentPresShellState()->mPresShell->GetRootFrame();
+ // There cannot be any transforms between aFrame and rootFrame
+ // because then bgData.shouldFixToViewport would have been false.
+ nsRect visibleRect =
+ displayData->mVisibleRect + aFrame->GetOffsetTo(rootFrame);
+ aBuilder->SetVisibleRect(visibleRect);
+ nsRect dirtyRect =
+ displayData->mDirtyRect + aFrame->GetOffsetTo(rootFrame);
+ aBuilder->SetDirtyRect(dirtyRect);
+ }
+ }
+
+ nsDisplayBackgroundImage* bgItem = nullptr;
+ {
+ // The clip is captured by the nsDisplayFixedPosition, so clear the
+ // clip for the nsDisplayBackgroundImage inside.
+ DisplayListClipState::AutoSaveRestore bgImageClip(aBuilder);
+ bgImageClip.Clear();
+ bgItem = CreateBackgroundImage(aBuilder, aFrame,
+ aSecondaryReferenceFrame, bgData);
+ }
+ if (bgItem) {
+ thisItemList.AppendToTop(
+ nsDisplayFixedPosition::CreateForFixedBackground(
+ aBuilder, aFrame, aSecondaryReferenceFrame, bgItem, i, asr));
+ }
+ } else { // bgData.shouldFixToViewport == false
+ nsDisplayBackgroundImage* bgItem = CreateBackgroundImage(
+ aBuilder, aFrame, aSecondaryReferenceFrame, bgData);
+ if (bgItem) {
+ thisItemList.AppendToTop(bgItem);
+ }
+ }
+
+ if (bg->mImage.mLayers[i].mBlendMode != StyleBlend::Normal) {
+ // asr is scrolled. Even if we wrap a fixed background layer, that's
+ // fine, because the item will have a scrolled clip that limits the
+ // item with respect to asr.
+ if (aSecondaryReferenceFrame) {
+ const auto tableType = GetTableTypeFromFrame(aFrame);
+ const uint16_t index = CalculateTablePerFrameKey(i + 1, tableType);
+
+ thisItemList.AppendNewToTopWithIndex<nsDisplayTableBlendMode>(
+ aBuilder, aSecondaryReferenceFrame, index, &thisItemList,
+ bg->mImage.mLayers[i].mBlendMode, asr, aFrame, true);
+ } else {
+ thisItemList.AppendNewToTopWithIndex<nsDisplayBlendMode>(
+ aBuilder, aFrame, i + 1, &thisItemList,
+ bg->mImage.mLayers[i].mBlendMode, asr, true);
+ }
+ }
+ bgItemList.AppendToTop(&thisItemList);
+ }
+
+ if (needBlendContainer) {
+ bgItemList.AppendToTop(
+ nsDisplayBlendContainer::CreateForBackgroundBlendMode(
+ aBuilder, aFrame, aSecondaryReferenceFrame, &bgItemList, asr));
+ }
+
+ if (!bgItemList.IsEmpty()) {
+ aList->AppendToTop(&bgItemList);
+ return AppendedBackgroundType::Background;
+ }
+
+ return AppendedBackgroundType::None;
+}
+
+// Check that the rounded border of aFrame, added to aToReferenceFrame,
+// intersects aRect. Assumes that the unrounded border has already
+// been checked for intersection.
+static bool RoundedBorderIntersectsRect(nsIFrame* aFrame,
+ const nsPoint& aFrameToReferenceFrame,
+ const nsRect& aTestRect) {
+ if (!nsRect(aFrameToReferenceFrame, aFrame->GetSize())
+ .Intersects(aTestRect)) {
+ return false;
+ }
+
+ nscoord radii[8];
+ return !aFrame->GetBorderRadii(radii) ||
+ nsLayoutUtils::RoundedRectIntersectsRect(
+ nsRect(aFrameToReferenceFrame, aFrame->GetSize()), radii,
+ aTestRect);
+}
+
+// Returns TRUE if aContainedRect is guaranteed to be contained in
+// the rounded rect defined by aRoundedRect and aRadii. Complex cases are
+// handled conservatively by returning FALSE in some situations where
+// a more thorough analysis could return TRUE.
+//
+// See also RoundedRectIntersectsRect.
+static bool RoundedRectContainsRect(const nsRect& aRoundedRect,
+ const nscoord aRadii[8],
+ const nsRect& aContainedRect) {
+ nsRegion rgn = nsLayoutUtils::RoundedRectIntersectRect(aRoundedRect, aRadii,
+ aContainedRect);
+ return rgn.Contains(aContainedRect);
+}
+
+bool nsDisplayBackgroundImage::CanApplyOpacity(
+ WebRenderLayerManager* aManager, nsDisplayListBuilder* aBuilder) const {
+ return CanBuildWebRenderDisplayItems(aManager, aBuilder);
+}
+
+bool nsDisplayBackgroundImage::CanBuildWebRenderDisplayItems(
+ WebRenderLayerManager* aManager, nsDisplayListBuilder* aBuilder) const {
+ return mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer].mClip !=
+ StyleGeometryBox::Text &&
+ nsCSSRendering::CanBuildWebRenderDisplayItemsForStyleImageLayer(
+ aManager, *StyleFrame()->PresContext(), StyleFrame(),
+ mBackgroundStyle->StyleBackground(), mLayer,
+ aBuilder->GetBackgroundPaintFlags());
+}
+
+bool nsDisplayBackgroundImage::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ if (!CanBuildWebRenderDisplayItems(aManager->LayerManager(),
+ aDisplayListBuilder)) {
+ return false;
+ }
+
+ uint32_t paintFlags = aDisplayListBuilder->GetBackgroundPaintFlags();
+ bool dummy;
+ nsCSSRendering::PaintBGParams params =
+ nsCSSRendering::PaintBGParams::ForSingleLayer(
+ *StyleFrame()->PresContext(), GetBounds(aDisplayListBuilder, &dummy),
+ mBackgroundRect, StyleFrame(), paintFlags, mLayer,
+ CompositionOp::OP_OVER, aBuilder.GetInheritedOpacity());
+ params.bgClipRect = &mBounds;
+ ImgDrawResult result =
+ nsCSSRendering::BuildWebRenderDisplayItemsForStyleImageLayer(
+ params, aBuilder, aResources, aSc, aManager, this);
+ if (result == ImgDrawResult::NOT_SUPPORTED) {
+ return false;
+ }
+ return true;
+}
+
+void nsDisplayBackgroundImage::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect,
+ HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ if (RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
+ aOutFrames->AppendElement(mFrame);
+ }
+}
+
+static nsRect GetInsideClipRect(const nsDisplayItem* aItem,
+ StyleGeometryBox aClip, const nsRect& aRect,
+ const nsRect& aBackgroundRect) {
+ if (aRect.IsEmpty()) {
+ return {};
+ }
+
+ nsIFrame* frame = aItem->Frame();
+
+ nsRect clipRect = aBackgroundRect;
+ if (frame->IsCanvasFrame()) {
+ nsCanvasFrame* canvasFrame = static_cast<nsCanvasFrame*>(frame);
+ clipRect = canvasFrame->CanvasArea() + aItem->ToReferenceFrame();
+ } else if (aClip == StyleGeometryBox::PaddingBox ||
+ aClip == StyleGeometryBox::ContentBox) {
+ nsMargin border = frame->GetUsedBorder();
+ if (aClip == StyleGeometryBox::ContentBox) {
+ border += frame->GetUsedPadding();
+ }
+ border.ApplySkipSides(frame->GetSkipSides());
+ clipRect.Deflate(border);
+ }
+
+ return clipRect.Intersect(aRect);
+}
+
+nsRegion nsDisplayBackgroundImage::GetOpaqueRegion(
+ nsDisplayListBuilder* aBuilder, bool* aSnap) const {
+ nsRegion result;
+ *aSnap = false;
+
+ if (!mBackgroundStyle) {
+ return result;
+ }
+
+ *aSnap = true;
+
+ // For StyleBoxDecorationBreak::Slice, don't try to optimize here, since
+ // this could easily lead to O(N^2) behavior inside InlineBackgroundData,
+ // which expects frames to be sent to it in content order, not reverse
+ // content order which we'll produce here.
+ // Of course, if there's only one frame in the flow, it doesn't matter.
+ if (mFrame->StyleBorder()->mBoxDecorationBreak ==
+ StyleBoxDecorationBreak::Clone ||
+ (!mFrame->GetPrevContinuation() && !mFrame->GetNextContinuation())) {
+ const nsStyleImageLayers::Layer& layer =
+ mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer];
+ if (layer.mImage.IsOpaque() && layer.mBlendMode == StyleBlend::Normal &&
+ layer.mRepeat.mXRepeat != StyleImageLayerRepeat::Space &&
+ layer.mRepeat.mYRepeat != StyleImageLayerRepeat::Space &&
+ layer.mClip != StyleGeometryBox::Text) {
+ result = GetInsideClipRect(this, layer.mClip, mBounds, mBackgroundRect);
+ }
+ }
+
+ return result;
+}
+
+Maybe<nscolor> nsDisplayBackgroundImage::IsUniform(
+ nsDisplayListBuilder* aBuilder) const {
+ if (!mBackgroundStyle) {
+ return Some(NS_RGBA(0, 0, 0, 0));
+ }
+ return Nothing();
+}
+
+nsRect nsDisplayBackgroundImage::GetPositioningArea() const {
+ if (!mBackgroundStyle) {
+ return nsRect();
+ }
+ nsIFrame* attachedToFrame;
+ bool transformedFixed;
+ return nsCSSRendering::ComputeImageLayerPositioningArea(
+ mFrame->PresContext(), mFrame, mBackgroundRect,
+ mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer],
+ &attachedToFrame, &transformedFixed) +
+ ToReferenceFrame();
+}
+
+bool nsDisplayBackgroundImage::RenderingMightDependOnPositioningAreaSizeChange()
+ const {
+ if (!mBackgroundStyle) {
+ return false;
+ }
+
+ nscoord radii[8];
+ if (mFrame->GetBorderRadii(radii)) {
+ // A change in the size of the positioning area might change the position
+ // of the rounded corners.
+ return true;
+ }
+
+ const nsStyleImageLayers::Layer& layer =
+ mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer];
+ return layer.RenderingMightDependOnPositioningAreaSizeChange();
+}
+
+void nsDisplayBackgroundImage::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ PaintInternal(aBuilder, aCtx, GetPaintRect(aBuilder, aCtx), &mBounds);
+}
+
+void nsDisplayBackgroundImage::PaintInternal(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx,
+ const nsRect& aBounds,
+ nsRect* aClipRect) {
+ gfxContext* ctx = aCtx;
+ StyleGeometryBox clip =
+ mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer].mClip;
+
+ if (clip == StyleGeometryBox::Text) {
+ if (!GenerateAndPushTextMask(StyleFrame(), aCtx, mBackgroundRect,
+ aBuilder)) {
+ return;
+ }
+ }
+
+ nsCSSRendering::PaintBGParams params =
+ nsCSSRendering::PaintBGParams::ForSingleLayer(
+ *StyleFrame()->PresContext(), aBounds, mBackgroundRect, StyleFrame(),
+ aBuilder->GetBackgroundPaintFlags(), mLayer, CompositionOp::OP_OVER,
+ 1.0f);
+ params.bgClipRect = aClipRect;
+ Unused << nsCSSRendering::PaintStyleImageLayer(params, *aCtx);
+
+ if (clip == StyleGeometryBox::Text) {
+ ctx->PopGroupAndBlend();
+ }
+}
+
+void nsDisplayBackgroundImage::ComputeInvalidationRegion(
+ nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
+ nsRegion* aInvalidRegion) const {
+ if (!mBackgroundStyle) {
+ return;
+ }
+
+ const auto* geometry =
+ static_cast<const nsDisplayBackgroundGeometry*>(aGeometry);
+
+ bool snap;
+ nsRect bounds = GetBounds(aBuilder, &snap);
+ nsRect positioningArea = GetPositioningArea();
+ if (positioningArea.TopLeft() != geometry->mPositioningArea.TopLeft() ||
+ (positioningArea.Size() != geometry->mPositioningArea.Size() &&
+ RenderingMightDependOnPositioningAreaSizeChange())) {
+ // Positioning area changed in a way that could cause everything to change,
+ // so invalidate everything (both old and new painting areas).
+ aInvalidRegion->Or(bounds, geometry->mBounds);
+ return;
+ }
+ if (!mDestRect.IsEqualInterior(geometry->mDestRect)) {
+ // Dest area changed in a way that could cause everything to change,
+ // so invalidate everything (both old and new painting areas).
+ aInvalidRegion->Or(bounds, geometry->mBounds);
+ return;
+ }
+ if (!bounds.IsEqualInterior(geometry->mBounds)) {
+ // Positioning area is unchanged, so invalidate just the change in the
+ // painting area.
+ aInvalidRegion->Xor(bounds, geometry->mBounds);
+ }
+}
+
+nsRect nsDisplayBackgroundImage::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = true;
+ return mBounds;
+}
+
+nsRect nsDisplayBackgroundImage::GetBoundsInternal(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrameForBounds) {
+ // This allows nsDisplayTableBackgroundImage to change the frame used for
+ // bounds calculation.
+ nsIFrame* frame = aFrameForBounds ? aFrameForBounds : mFrame;
+
+ nsPresContext* presContext = frame->PresContext();
+
+ if (!mBackgroundStyle) {
+ return nsRect();
+ }
+
+ nsRect clipRect = mBackgroundRect;
+ if (frame->IsCanvasFrame()) {
+ nsCanvasFrame* canvasFrame = static_cast<nsCanvasFrame*>(frame);
+ clipRect = canvasFrame->CanvasArea() + ToReferenceFrame();
+ }
+ const nsStyleImageLayers::Layer& layer =
+ mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer];
+ return nsCSSRendering::GetBackgroundLayerRect(
+ presContext, frame, mBackgroundRect, clipRect, layer,
+ aBuilder->GetBackgroundPaintFlags());
+}
+
+nsDisplayTableBackgroundImage::nsDisplayTableBackgroundImage(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, const InitData& aData,
+ nsIFrame* aCellFrame)
+ : nsDisplayBackgroundImage(aBuilder, aFrame, aData, aCellFrame),
+ mStyleFrame(aCellFrame) {
+ if (aBuilder->IsRetainingDisplayList()) {
+ mStyleFrame->AddDisplayItem(this);
+ }
+}
+
+nsDisplayTableBackgroundImage::~nsDisplayTableBackgroundImage() {
+ if (mStyleFrame) {
+ mStyleFrame->RemoveDisplayItem(this);
+ }
+}
+
+bool nsDisplayTableBackgroundImage::IsInvalid(nsRect& aRect) const {
+ bool result = mStyleFrame ? mStyleFrame->IsInvalid(aRect) : false;
+ aRect += ToReferenceFrame();
+ return result;
+}
+
+nsDisplayThemedBackground::nsDisplayThemedBackground(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ const nsRect& aBackgroundRect)
+ : nsPaintedDisplayItem(aBuilder, aFrame), mBackgroundRect(aBackgroundRect) {
+ MOZ_COUNT_CTOR(nsDisplayThemedBackground);
+}
+
+void nsDisplayThemedBackground::Init(nsDisplayListBuilder* aBuilder) {
+ const nsStyleDisplay* disp = StyleFrame()->StyleDisplay();
+ mAppearance = disp->EffectiveAppearance();
+ StyleFrame()->IsThemed(disp, &mThemeTransparency);
+
+ // Perform necessary RegisterThemeGeometry
+ nsITheme* theme = StyleFrame()->PresContext()->Theme();
+ nsITheme::ThemeGeometryType type =
+ theme->ThemeGeometryTypeForWidget(StyleFrame(), mAppearance);
+ if (type != nsITheme::eThemeGeometryTypeUnknown) {
+ RegisterThemeGeometry(aBuilder, this, StyleFrame(), type);
+ }
+
+ if (mAppearance == StyleAppearance::MozWinBorderlessGlass) {
+ aBuilder->SetGlassDisplayItem(this);
+ }
+
+ mBounds = GetBoundsInternal();
+}
+
+void nsDisplayThemedBackground::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << " (themed, appearance:" << (int)mAppearance << ")";
+}
+
+void nsDisplayThemedBackground::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect,
+ HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ // Assume that any point in our background rect is a hit.
+ if (mBackgroundRect.Intersects(aRect)) {
+ aOutFrames->AppendElement(mFrame);
+ }
+}
+
+nsRegion nsDisplayThemedBackground::GetOpaqueRegion(
+ nsDisplayListBuilder* aBuilder, bool* aSnap) const {
+ nsRegion result;
+ *aSnap = false;
+
+ if (mThemeTransparency == nsITheme::eOpaque) {
+ *aSnap = true;
+ result = mBackgroundRect;
+ }
+ return result;
+}
+
+Maybe<nscolor> nsDisplayThemedBackground::IsUniform(
+ nsDisplayListBuilder* aBuilder) const {
+ if (mAppearance == StyleAppearance::MozWinBorderlessGlass) {
+ return Some(NS_RGBA(0, 0, 0, 0));
+ }
+ return Nothing();
+}
+
+nsRect nsDisplayThemedBackground::GetPositioningArea() const {
+ return mBackgroundRect;
+}
+
+void nsDisplayThemedBackground::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ PaintInternal(aBuilder, aCtx, GetPaintRect(aBuilder, aCtx), nullptr);
+}
+
+void nsDisplayThemedBackground::PaintInternal(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx,
+ const nsRect& aBounds,
+ nsRect* aClipRect) {
+ // XXXzw this ignores aClipRect.
+ nsPresContext* presContext = StyleFrame()->PresContext();
+ nsITheme* theme = presContext->Theme();
+ nsRect drawing(mBackgroundRect);
+ theme->GetWidgetOverflow(presContext->DeviceContext(), StyleFrame(),
+ mAppearance, &drawing);
+ drawing.IntersectRect(drawing, aBounds);
+ theme->DrawWidgetBackground(aCtx, StyleFrame(), mAppearance, mBackgroundRect,
+ drawing);
+}
+
+bool nsDisplayThemedBackground::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ nsITheme* theme = StyleFrame()->PresContext()->Theme();
+ return theme->CreateWebRenderCommandsForWidget(aBuilder, aResources, aSc,
+ aManager, StyleFrame(),
+ mAppearance, mBackgroundRect);
+}
+
+bool nsDisplayThemedBackground::IsWindowActive() const {
+ DocumentState docState = mFrame->GetContent()->OwnerDoc()->GetDocumentState();
+ return !docState.HasState(DocumentState::WINDOW_INACTIVE);
+}
+
+void nsDisplayThemedBackground::ComputeInvalidationRegion(
+ nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
+ nsRegion* aInvalidRegion) const {
+ const auto* geometry =
+ static_cast<const nsDisplayThemedBackgroundGeometry*>(aGeometry);
+
+ bool snap;
+ nsRect bounds = GetBounds(aBuilder, &snap);
+ nsRect positioningArea = GetPositioningArea();
+ if (!positioningArea.IsEqualInterior(geometry->mPositioningArea)) {
+ // Invalidate everything (both old and new painting areas).
+ aInvalidRegion->Or(bounds, geometry->mBounds);
+ return;
+ }
+ if (!bounds.IsEqualInterior(geometry->mBounds)) {
+ // Positioning area is unchanged, so invalidate just the change in the
+ // painting area.
+ aInvalidRegion->Xor(bounds, geometry->mBounds);
+ }
+ nsITheme* theme = StyleFrame()->PresContext()->Theme();
+ if (theme->WidgetAppearanceDependsOnWindowFocus(mAppearance) &&
+ IsWindowActive() != geometry->mWindowIsActive) {
+ aInvalidRegion->Or(*aInvalidRegion, bounds);
+ }
+}
+
+nsRect nsDisplayThemedBackground::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = true;
+ return mBounds;
+}
+
+nsRect nsDisplayThemedBackground::GetBoundsInternal() {
+ nsPresContext* presContext = mFrame->PresContext();
+
+ nsRect r = mBackgroundRect - ToReferenceFrame();
+ presContext->Theme()->GetWidgetOverflow(
+ presContext->DeviceContext(), mFrame,
+ mFrame->StyleDisplay()->EffectiveAppearance(), &r);
+ return r + ToReferenceFrame();
+}
+
+#if defined(MOZ_REFLOW_PERF_DSP) && defined(MOZ_REFLOW_PERF)
+void nsDisplayReflowCount::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ mFrame->PresShell()->PaintCount(mFrameName, aCtx, mFrame->PresContext(),
+ mFrame, ToReferenceFrame(), mColor);
+}
+#endif
+
+bool nsDisplayBackgroundColor::CanApplyOpacity(
+ WebRenderLayerManager* aManager, nsDisplayListBuilder* aBuilder) const {
+ // Don't apply opacity if the background color is animated since the color is
+ // going to be changed on the compositor.
+ return !EffectCompositor::HasAnimationsForCompositor(
+ mFrame, DisplayItemType::TYPE_BACKGROUND_COLOR);
+}
+
+bool nsDisplayBackgroundColor::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ gfx::sRGBColor color = mColor;
+ color.a *= aBuilder.GetInheritedOpacity();
+
+ if (color == sRGBColor() &&
+ !EffectCompositor::HasAnimationsForCompositor(
+ mFrame, DisplayItemType::TYPE_BACKGROUND_COLOR)) {
+ return true;
+ }
+
+ if (HasBackgroundClipText()) {
+ return false;
+ }
+
+ uint64_t animationsId = 0;
+ // We don't support background-color animations on table elements yet.
+ if (GetType() == DisplayItemType::TYPE_BACKGROUND_COLOR) {
+ animationsId =
+ AddAnimationsForWebRender(this, aManager, aDisplayListBuilder);
+ }
+
+ LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
+ mBackgroundRect, mFrame->PresContext()->AppUnitsPerDevPixel());
+ wr::LayoutRect r = wr::ToLayoutRect(bounds);
+
+ if (animationsId) {
+ wr::WrAnimationProperty prop{
+ wr::WrAnimationType::BackgroundColor,
+ animationsId,
+ };
+ aBuilder.PushRectWithAnimation(r, r, !BackfaceIsHidden(),
+ wr::ToColorF(ToDeviceColor(color)), &prop);
+ } else {
+ aBuilder.StartGroup(this);
+ aBuilder.PushRect(r, r, !BackfaceIsHidden(), false, false,
+ wr::ToColorF(ToDeviceColor(color)));
+ aBuilder.FinishGroup();
+ }
+
+ return true;
+}
+
+void nsDisplayBackgroundColor::PaintWithClip(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx,
+ const DisplayItemClip& aClip) {
+ MOZ_ASSERT(!HasBackgroundClipText());
+
+ if (mColor == sRGBColor()) {
+ return;
+ }
+
+ nsRect fillRect = mBackgroundRect;
+ if (aClip.HasClip()) {
+ fillRect.IntersectRect(fillRect, aClip.GetClipRect());
+ }
+
+ DrawTarget* dt = aCtx->GetDrawTarget();
+ int32_t A2D = mFrame->PresContext()->AppUnitsPerDevPixel();
+ Rect bounds = ToRect(nsLayoutUtils::RectToGfxRect(fillRect, A2D));
+ MaybeSnapToDevicePixels(bounds, *dt);
+ ColorPattern fill(ToDeviceColor(mColor));
+
+ if (aClip.GetRoundedRectCount()) {
+ MOZ_ASSERT(aClip.GetRoundedRectCount() == 1);
+
+ AutoTArray<DisplayItemClip::RoundedRect, 1> roundedRect;
+ aClip.AppendRoundedRects(&roundedRect);
+
+ bool pushedClip = false;
+ if (!fillRect.Contains(roundedRect[0].mRect)) {
+ dt->PushClipRect(bounds);
+ pushedClip = true;
+ }
+
+ RectCornerRadii pixelRadii;
+ nsCSSRendering::ComputePixelRadii(roundedRect[0].mRadii, A2D, &pixelRadii);
+ dt->FillRoundedRect(
+ RoundedRect(NSRectToSnappedRect(roundedRect[0].mRect, A2D, *dt),
+ pixelRadii),
+ fill);
+ if (pushedClip) {
+ dt->PopClip();
+ }
+ } else {
+ dt->FillRect(bounds, fill);
+ }
+}
+
+void nsDisplayBackgroundColor::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ if (mColor == sRGBColor()) {
+ return;
+ }
+
+#if 0
+ // See https://bugzilla.mozilla.org/show_bug.cgi?id=1148418#c21 for why this
+ // results in a precision induced rounding issue that makes the rect one
+ // pixel shorter in rare cases. Disabled in favor of the old code for now.
+ // Note that the pref layout.css.devPixelsPerPx needs to be set to 1 to
+ // reproduce the bug.
+ //
+ // TODO:
+ // This new path does not include support for background-clip:text; need to
+ // be fixed if/when we switch to this new code path.
+
+ DrawTarget& aDrawTarget = *aCtx->GetDrawTarget();
+
+ Rect rect = NSRectToSnappedRect(mBackgroundRect,
+ mFrame->PresContext()->AppUnitsPerDevPixel(),
+ aDrawTarget);
+ ColorPattern color(ToDeviceColor(mColor));
+ aDrawTarget.FillRect(rect, color);
+#else
+ gfxContext* ctx = aCtx;
+ gfxRect bounds = nsLayoutUtils::RectToGfxRect(
+ mBackgroundRect, mFrame->PresContext()->AppUnitsPerDevPixel());
+
+ if (HasBackgroundClipText()) {
+ if (!GenerateAndPushTextMask(mFrame, aCtx, mBackgroundRect, aBuilder)) {
+ return;
+ }
+
+ ctx->SetColor(mColor);
+ ctx->NewPath();
+ ctx->SnappedRectangle(bounds);
+ ctx->Fill();
+ ctx->PopGroupAndBlend();
+ return;
+ }
+
+ ctx->SetColor(mColor);
+ ctx->NewPath();
+ ctx->SnappedRectangle(bounds);
+ ctx->Fill();
+#endif
+}
+
+nsRegion nsDisplayBackgroundColor::GetOpaqueRegion(
+ nsDisplayListBuilder* aBuilder, bool* aSnap) const {
+ *aSnap = false;
+
+ if (mColor.a != 1 ||
+ // Even if the current alpha channel is 1, we treat this item as if it's
+ // non-opaque if there is a background-color animation since the animation
+ // might change the alpha channel.
+ EffectCompositor::HasAnimationsForCompositor(
+ mFrame, DisplayItemType::TYPE_BACKGROUND_COLOR)) {
+ return nsRegion();
+ }
+
+ if (!mHasStyle || HasBackgroundClipText()) {
+ return nsRegion();
+ }
+
+ *aSnap = true;
+ return GetInsideClipRect(this, mBottomLayerClip, mBackgroundRect,
+ mBackgroundRect);
+}
+
+Maybe<nscolor> nsDisplayBackgroundColor::IsUniform(
+ nsDisplayListBuilder* aBuilder) const {
+ return Some(mColor.ToABGR());
+}
+
+void nsDisplayBackgroundColor::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect,
+ HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
+ // aRect doesn't intersect our border-radius curve.
+ return;
+ }
+
+ aOutFrames->AppendElement(mFrame);
+}
+
+void nsDisplayBackgroundColor::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << " (rgba " << mColor.r << "," << mColor.g << "," << mColor.b << ","
+ << mColor.a << ")";
+ aStream << " backgroundRect" << mBackgroundRect;
+}
+
+nsRect nsDisplayOutline::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ return mFrame->InkOverflowRectRelativeToSelf() + ToReferenceFrame();
+}
+
+nsRect nsDisplayOutline::GetInnerRect() const {
+ if (nsRect* savedOutlineInnerRect =
+ mFrame->GetProperty(nsIFrame::OutlineInnerRectProperty())) {
+ return *savedOutlineInnerRect;
+ }
+ return mFrame->GetRectRelativeToSelf();
+}
+
+void nsDisplayOutline::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+ // TODO join outlines together
+ MOZ_ASSERT(mFrame->StyleOutline()->ShouldPaintOutline(),
+ "Should have not created a nsDisplayOutline!");
+
+ nsRect rect = GetInnerRect() + ToReferenceFrame();
+ nsPresContext* pc = mFrame->PresContext();
+ if (IsThemedOutline()) {
+ rect.Inflate(mFrame->StyleOutline()->mOutlineOffset.ToAppUnits());
+ pc->Theme()->DrawWidgetBackground(aCtx, mFrame,
+ StyleAppearance::FocusOutline, rect,
+ GetPaintRect(aBuilder, aCtx));
+ return;
+ }
+
+ nsCSSRendering::PaintNonThemedOutline(
+ pc, *aCtx, mFrame, GetPaintRect(aBuilder, aCtx), rect, mFrame->Style());
+}
+
+bool nsDisplayOutline::IsThemedOutline() const {
+#ifdef DEBUG
+ nsPresContext* pc = mFrame->PresContext();
+ MOZ_ASSERT(
+ pc->Theme()->ThemeSupportsWidget(pc, mFrame,
+ StyleAppearance::FocusOutline),
+ "All of our supported platforms have support for themed focus-outlines");
+#endif
+ return mFrame->StyleOutline()->mOutlineStyle.IsAuto();
+}
+
+bool nsDisplayOutline::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ nsPresContext* pc = mFrame->PresContext();
+ nsRect rect = GetInnerRect() + ToReferenceFrame();
+ if (IsThemedOutline()) {
+ rect.Inflate(mFrame->StyleOutline()->mOutlineOffset.ToAppUnits());
+ return pc->Theme()->CreateWebRenderCommandsForWidget(
+ aBuilder, aResources, aSc, aManager, mFrame,
+ StyleAppearance::FocusOutline, rect);
+ }
+
+ bool dummy;
+ Maybe<nsCSSBorderRenderer> borderRenderer =
+ nsCSSRendering::CreateBorderRendererForNonThemedOutline(
+ pc, /* aDrawTarget = */ nullptr, mFrame,
+ GetBounds(aDisplayListBuilder, &dummy), rect, mFrame->Style());
+
+ if (!borderRenderer) {
+ // No border renderer means "there is no outline".
+ // Paint nothing and return success.
+ return true;
+ }
+
+ borderRenderer->CreateWebRenderCommands(this, aBuilder, aResources, aSc);
+ return true;
+}
+
+bool nsDisplayOutline::HasRadius() const {
+ const auto& radius = mFrame->StyleBorder()->mBorderRadius;
+ return !nsLayoutUtils::HasNonZeroCorner(radius);
+}
+
+bool nsDisplayOutline::IsInvisibleInRect(const nsRect& aRect) const {
+ const nsStyleOutline* outline = mFrame->StyleOutline();
+ nsRect borderBox(ToReferenceFrame(), mFrame->GetSize());
+ if (borderBox.Contains(aRect) && !HasRadius() &&
+ outline->mOutlineOffset.ToCSSPixels() >= 0.0f) {
+ // aRect is entirely inside the border-rect, and the outline isn't rendered
+ // inside the border-rect, so the outline is not visible.
+ return true;
+ }
+ return false;
+}
+
+void nsDisplayEventReceiver::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect, HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
+ // aRect doesn't intersect our border-radius curve.
+ return;
+ }
+
+ aOutFrames->AppendElement(mFrame);
+}
+
+bool nsDisplayCompositorHitTestInfo::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ return true;
+}
+
+int32_t nsDisplayCompositorHitTestInfo::ZIndex() const {
+ return mOverrideZIndex ? *mOverrideZIndex : nsDisplayItem::ZIndex();
+}
+
+void nsDisplayCompositorHitTestInfo::SetOverrideZIndex(int32_t aZIndex) {
+ mOverrideZIndex = Some(aZIndex);
+}
+
+nsDisplayCaret::nsDisplayCaret(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aCaretFrame)
+ : nsPaintedDisplayItem(aBuilder, aCaretFrame),
+ mCaret(aBuilder->GetCaret()),
+ mBounds(aBuilder->GetCaretRect() + ToReferenceFrame()) {
+ MOZ_COUNT_CTOR(nsDisplayCaret);
+ // The presence of a caret doesn't change the overflow rect
+ // of the owning frame, so the normal building rect might not
+ // include the caret at all. We use MarkFrameForDisplay to ensure
+ // we build this item, and here we override the building rect
+ // to cover the pixels we're going to draw.
+ SetBuildingRect(mBounds);
+}
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+nsDisplayCaret::~nsDisplayCaret() { MOZ_COUNT_DTOR(nsDisplayCaret); }
+#endif
+
+nsRect nsDisplayCaret::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = true;
+ // The caret returns a rect in the coordinates of mFrame.
+ return mBounds;
+}
+
+void nsDisplayCaret::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+ // Note: Because we exist, we know that the caret is visible, so we don't
+ // need to check for the caret's visibility.
+ mCaret->PaintCaret(*aCtx->GetDrawTarget(), mFrame, ToReferenceFrame());
+}
+
+bool nsDisplayCaret::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ using namespace layers;
+ nsRect caretRect;
+ nsRect hookRect;
+ nscolor caretColor;
+ nsIFrame* frame =
+ mCaret->GetPaintGeometry(&caretRect, &hookRect, &caretColor);
+ MOZ_ASSERT(frame == mFrame, "We're referring different frame");
+ if (!frame) {
+ return true;
+ }
+
+ int32_t appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
+ gfx::DeviceColor color = ToDeviceColor(caretColor);
+ LayoutDeviceRect devCaretRect = LayoutDeviceRect::FromAppUnits(
+ caretRect + ToReferenceFrame(), appUnitsPerDevPixel);
+ LayoutDeviceRect devHookRect = LayoutDeviceRect::FromAppUnits(
+ hookRect + ToReferenceFrame(), appUnitsPerDevPixel);
+
+ wr::LayoutRect caret = wr::ToLayoutRect(devCaretRect);
+ wr::LayoutRect hook = wr::ToLayoutRect(devHookRect);
+
+ // Note, WR will pixel snap anything that is layout aligned.
+ aBuilder.PushRect(caret, caret, !BackfaceIsHidden(), false, false,
+ wr::ToColorF(color));
+
+ if (!devHookRect.IsEmpty()) {
+ aBuilder.PushRect(hook, hook, !BackfaceIsHidden(), false, false,
+ wr::ToColorF(color));
+ }
+ return true;
+}
+
+nsDisplayBorder::nsDisplayBorder(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame)
+ : nsPaintedDisplayItem(aBuilder, aFrame) {
+ MOZ_COUNT_CTOR(nsDisplayBorder);
+
+ mBounds = CalculateBounds<nsRect>(*mFrame->StyleBorder());
+}
+
+bool nsDisplayBorder::IsInvisibleInRect(const nsRect& aRect) const {
+ nsRect paddingRect = GetPaddingRect();
+ const nsStyleBorder* styleBorder;
+ if (paddingRect.Contains(aRect) &&
+ !(styleBorder = mFrame->StyleBorder())->IsBorderImageSizeAvailable() &&
+ !nsLayoutUtils::HasNonZeroCorner(styleBorder->mBorderRadius)) {
+ // aRect is entirely inside the content rect, and no part
+ // of the border is rendered inside the content rect, so we are not
+ // visible
+ // Skip this if there's a border-image (which draws a background
+ // too) or if there is a border-radius (which makes the border draw
+ // further in).
+ return true;
+ }
+
+ return false;
+}
+
+nsDisplayItemGeometry* nsDisplayBorder::AllocateGeometry(
+ nsDisplayListBuilder* aBuilder) {
+ return new nsDisplayBorderGeometry(this, aBuilder);
+}
+
+void nsDisplayBorder::ComputeInvalidationRegion(
+ nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
+ nsRegion* aInvalidRegion) const {
+ const auto* geometry = static_cast<const nsDisplayBorderGeometry*>(aGeometry);
+ bool snap;
+
+ if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap))) {
+ // We can probably get away with only invalidating the difference
+ // between the border and padding rects, but the XUL ui at least
+ // is apparently painting a background with this?
+ aInvalidRegion->Or(GetBounds(aBuilder, &snap), geometry->mBounds);
+ }
+}
+
+bool nsDisplayBorder::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ nsRect rect = nsRect(ToReferenceFrame(), mFrame->GetSize());
+
+ ImgDrawResult drawResult = nsCSSRendering::CreateWebRenderCommandsForBorder(
+ this, mFrame, rect, aBuilder, aResources, aSc, aManager,
+ aDisplayListBuilder);
+
+ if (drawResult == ImgDrawResult::NOT_SUPPORTED) {
+ return false;
+ }
+ return true;
+};
+
+void nsDisplayBorder::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+ nsPoint offset = ToReferenceFrame();
+
+ PaintBorderFlags flags = aBuilder->ShouldSyncDecodeImages()
+ ? PaintBorderFlags::SyncDecodeImages
+ : PaintBorderFlags();
+
+ Unused << nsCSSRendering::PaintBorder(
+ mFrame->PresContext(), *aCtx, mFrame, GetPaintRect(aBuilder, aCtx),
+ nsRect(offset, mFrame->GetSize()), mFrame->Style(), flags,
+ mFrame->GetSkipSides());
+}
+
+nsRect nsDisplayBorder::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = true;
+ return mBounds;
+}
+
+void nsDisplayBoxShadowOuter::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ nsPoint offset = ToReferenceFrame();
+ nsRect borderRect = mFrame->VisualBorderRectRelativeToSelf() + offset;
+ nsPresContext* presContext = mFrame->PresContext();
+
+ AUTO_PROFILER_LABEL("nsDisplayBoxShadowOuter::Paint", GRAPHICS);
+
+ nsCSSRendering::PaintBoxShadowOuter(presContext, *aCtx, mFrame, borderRect,
+ GetPaintRect(aBuilder, aCtx), 1.0f);
+}
+
+nsRect nsDisplayBoxShadowOuter::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ return mBounds;
+}
+
+nsRect nsDisplayBoxShadowOuter::GetBoundsInternal() {
+ return nsLayoutUtils::GetBoxShadowRectForFrame(mFrame, mFrame->GetSize()) +
+ ToReferenceFrame();
+}
+
+bool nsDisplayBoxShadowOuter::IsInvisibleInRect(const nsRect& aRect) const {
+ nsPoint origin = ToReferenceFrame();
+ nsRect frameRect(origin, mFrame->GetSize());
+ if (!frameRect.Contains(aRect)) {
+ return false;
+ }
+
+ // the visible region is entirely inside the border-rect, and box shadows
+ // never render within the border-rect (unless there's a border radius).
+ nscoord twipsRadii[8];
+ bool hasBorderRadii = mFrame->GetBorderRadii(twipsRadii);
+ if (!hasBorderRadii) {
+ return true;
+ }
+
+ return RoundedRectContainsRect(frameRect, twipsRadii, aRect);
+}
+
+bool nsDisplayBoxShadowOuter::CanBuildWebRenderDisplayItems() const {
+ auto shadows = mFrame->StyleEffects()->mBoxShadow.AsSpan();
+ if (shadows.IsEmpty()) {
+ return false;
+ }
+
+ bool hasBorderRadius;
+ // We don't support native themed things yet like box shadows around
+ // input buttons.
+ //
+ // TODO(emilio): The non-native theme could provide the right rect+radius
+ // instead relatively painlessly, if we find this causes performance issues or
+ // what not.
+ return !nsCSSRendering::HasBoxShadowNativeTheme(mFrame, hasBorderRadius);
+}
+
+bool nsDisplayBoxShadowOuter::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ if (!CanBuildWebRenderDisplayItems()) {
+ return false;
+ }
+
+ int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+ nsPoint offset = ToReferenceFrame();
+ nsRect borderRect = mFrame->VisualBorderRectRelativeToSelf() + offset;
+ bool snap;
+ nsRect bounds = GetBounds(aDisplayListBuilder, &snap);
+
+ bool hasBorderRadius;
+ bool nativeTheme =
+ nsCSSRendering::HasBoxShadowNativeTheme(mFrame, hasBorderRadius);
+
+ // Don't need the full size of the shadow rect like we do in
+ // nsCSSRendering since WR takes care of calculations for blur
+ // and spread radius.
+ nsRect frameRect =
+ nsCSSRendering::GetShadowRect(borderRect, nativeTheme, mFrame);
+
+ RectCornerRadii borderRadii;
+ if (hasBorderRadius) {
+ hasBorderRadius = nsCSSRendering::GetBorderRadii(frameRect, borderRect,
+ mFrame, borderRadii);
+ }
+
+ // Everything here is in app units, change to device units.
+ LayoutDeviceRect clipRect =
+ LayoutDeviceRect::FromAppUnits(bounds, appUnitsPerDevPixel);
+ auto shadows = mFrame->StyleEffects()->mBoxShadow.AsSpan();
+ MOZ_ASSERT(!shadows.IsEmpty());
+
+ for (const auto& shadow : Reversed(shadows)) {
+ if (shadow.inset) {
+ continue;
+ }
+
+ float blurRadius =
+ float(shadow.base.blur.ToAppUnits()) / float(appUnitsPerDevPixel);
+ gfx::sRGBColor shadowColor = nsCSSRendering::GetShadowColor(
+ shadow.base, mFrame, aBuilder.GetInheritedOpacity());
+
+ // We don't move the shadow rect here since WR does it for us
+ // Now translate everything to device pixels.
+ const nsRect& shadowRect = frameRect;
+ LayoutDevicePoint shadowOffset = LayoutDevicePoint::FromAppUnits(
+ nsPoint(shadow.base.horizontal.ToAppUnits(),
+ shadow.base.vertical.ToAppUnits()),
+ appUnitsPerDevPixel);
+
+ LayoutDeviceRect deviceBox =
+ LayoutDeviceRect::FromAppUnits(shadowRect, appUnitsPerDevPixel);
+ wr::LayoutRect deviceBoxRect = wr::ToLayoutRect(deviceBox);
+ wr::LayoutRect deviceClipRect = wr::ToLayoutRect(clipRect);
+
+ LayoutDeviceSize zeroSize;
+ wr::BorderRadius borderRadius =
+ wr::ToBorderRadius(zeroSize, zeroSize, zeroSize, zeroSize);
+ if (hasBorderRadius) {
+ borderRadius = wr::ToBorderRadius(
+ LayoutDeviceSize::FromUnknownSize(borderRadii.TopLeft()),
+ LayoutDeviceSize::FromUnknownSize(borderRadii.TopRight()),
+ LayoutDeviceSize::FromUnknownSize(borderRadii.BottomLeft()),
+ LayoutDeviceSize::FromUnknownSize(borderRadii.BottomRight()));
+ }
+
+ float spreadRadius =
+ float(shadow.spread.ToAppUnits()) / float(appUnitsPerDevPixel);
+
+ aBuilder.PushBoxShadow(deviceBoxRect, deviceClipRect, !BackfaceIsHidden(),
+ deviceBoxRect, wr::ToLayoutVector2D(shadowOffset),
+ wr::ToColorF(ToDeviceColor(shadowColor)), blurRadius,
+ spreadRadius, borderRadius,
+ wr::BoxShadowClipMode::Outset);
+ }
+
+ return true;
+}
+
+void nsDisplayBoxShadowOuter::ComputeInvalidationRegion(
+ nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
+ nsRegion* aInvalidRegion) const {
+ const auto* geometry =
+ static_cast<const nsDisplayItemGenericGeometry*>(aGeometry);
+ bool snap;
+ if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap)) ||
+ !geometry->mBorderRect.IsEqualInterior(GetBorderRect())) {
+ nsRegion oldShadow, newShadow;
+ nscoord dontCare[8];
+ bool hasBorderRadius = mFrame->GetBorderRadii(dontCare);
+ if (hasBorderRadius) {
+ // If we have rounded corners then we need to invalidate the frame area
+ // too since we paint into it.
+ oldShadow = geometry->mBounds;
+ newShadow = GetBounds(aBuilder, &snap);
+ } else {
+ oldShadow.Sub(geometry->mBounds, geometry->mBorderRect);
+ newShadow.Sub(GetBounds(aBuilder, &snap), GetBorderRect());
+ }
+ aInvalidRegion->Or(oldShadow, newShadow);
+ }
+}
+
+void nsDisplayBoxShadowInner::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ nsPoint offset = ToReferenceFrame();
+ nsRect borderRect = nsRect(offset, mFrame->GetSize());
+ nsPresContext* presContext = mFrame->PresContext();
+
+ AUTO_PROFILER_LABEL("nsDisplayBoxShadowInner::Paint", GRAPHICS);
+
+ nsCSSRendering::PaintBoxShadowInner(presContext, *aCtx, mFrame, borderRect);
+}
+
+bool nsDisplayBoxShadowInner::CanCreateWebRenderCommands(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ const nsPoint& aReferenceOffset) {
+ auto shadows = aFrame->StyleEffects()->mBoxShadow.AsSpan();
+ if (shadows.IsEmpty()) {
+ // Means we don't have to paint anything
+ return true;
+ }
+
+ bool hasBorderRadius;
+ bool nativeTheme =
+ nsCSSRendering::HasBoxShadowNativeTheme(aFrame, hasBorderRadius);
+
+ // We don't support native themed things yet like box shadows around
+ // input buttons.
+ return !nativeTheme;
+}
+
+/* static */
+void nsDisplayBoxShadowInner::CreateInsetBoxShadowWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, const StackingContextHelper& aSc,
+ nsRect& aVisibleRect, nsIFrame* aFrame, const nsRect& aBorderRect) {
+ if (!nsCSSRendering::ShouldPaintBoxShadowInner(aFrame)) {
+ return;
+ }
+
+ int32_t appUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
+
+ auto shadows = aFrame->StyleEffects()->mBoxShadow.AsSpan();
+
+ LayoutDeviceRect clipRect =
+ LayoutDeviceRect::FromAppUnits(aVisibleRect, appUnitsPerDevPixel);
+
+ for (const auto& shadow : Reversed(shadows)) {
+ if (!shadow.inset) {
+ continue;
+ }
+
+ nsRect shadowRect =
+ nsCSSRendering::GetBoxShadowInnerPaddingRect(aFrame, aBorderRect);
+ RectCornerRadii innerRadii;
+ nsCSSRendering::GetShadowInnerRadii(aFrame, aBorderRect, innerRadii);
+
+ // Now translate everything to device pixels.
+ LayoutDeviceRect deviceBoxRect =
+ LayoutDeviceRect::FromAppUnits(shadowRect, appUnitsPerDevPixel);
+ wr::LayoutRect deviceClipRect = wr::ToLayoutRect(clipRect);
+ sRGBColor shadowColor =
+ nsCSSRendering::GetShadowColor(shadow.base, aFrame, 1.0);
+
+ LayoutDevicePoint shadowOffset = LayoutDevicePoint::FromAppUnits(
+ nsPoint(shadow.base.horizontal.ToAppUnits(),
+ shadow.base.vertical.ToAppUnits()),
+ appUnitsPerDevPixel);
+
+ float blurRadius =
+ float(shadow.base.blur.ToAppUnits()) / float(appUnitsPerDevPixel);
+
+ wr::BorderRadius borderRadius = wr::ToBorderRadius(
+ LayoutDeviceSize::FromUnknownSize(innerRadii.TopLeft()),
+ LayoutDeviceSize::FromUnknownSize(innerRadii.TopRight()),
+ LayoutDeviceSize::FromUnknownSize(innerRadii.BottomLeft()),
+ LayoutDeviceSize::FromUnknownSize(innerRadii.BottomRight()));
+ // NOTE: Any spread radius > 0 will render nothing. WR Bug.
+ float spreadRadius =
+ float(shadow.spread.ToAppUnits()) / float(appUnitsPerDevPixel);
+
+ aBuilder.PushBoxShadow(
+ wr::ToLayoutRect(deviceBoxRect), deviceClipRect,
+ !aFrame->BackfaceIsHidden(), wr::ToLayoutRect(deviceBoxRect),
+ wr::ToLayoutVector2D(shadowOffset),
+ wr::ToColorF(ToDeviceColor(shadowColor)), blurRadius, spreadRadius,
+ borderRadius, wr::BoxShadowClipMode::Inset);
+ }
+}
+
+bool nsDisplayBoxShadowInner::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ if (!CanCreateWebRenderCommands(aDisplayListBuilder, mFrame,
+ ToReferenceFrame())) {
+ return false;
+ }
+
+ bool snap;
+ nsRect visible = GetBounds(aDisplayListBuilder, &snap);
+ nsPoint offset = ToReferenceFrame();
+ nsRect borderRect = nsRect(offset, mFrame->GetSize());
+ nsDisplayBoxShadowInner::CreateInsetBoxShadowWebRenderCommands(
+ aBuilder, aSc, visible, mFrame, borderRect);
+
+ return true;
+}
+
+nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, nsDisplayList* aList)
+ : nsDisplayWrapList(aBuilder, aFrame, aList,
+ aBuilder->CurrentActiveScrolledRoot(), false) {}
+
+nsDisplayWrapList::nsDisplayWrapList(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot, bool aClearClipChain)
+ : nsPaintedDisplayItem(aBuilder, aFrame, aActiveScrolledRoot),
+ mList(aBuilder),
+ mFrameActiveScrolledRoot(aBuilder->CurrentActiveScrolledRoot()),
+ mOverrideZIndex(0),
+ mHasZIndexOverride(false),
+ mClearingClipChain(aClearClipChain) {
+ MOZ_COUNT_CTOR(nsDisplayWrapList);
+
+ mBaseBuildingRect = GetBuildingRect();
+
+ mListPtr = &mList;
+ mListPtr->AppendToTop(aList);
+ mOriginalClipChain = mClipChain;
+ nsDisplayWrapList::UpdateBounds(aBuilder);
+}
+
+nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, nsDisplayItem* aItem)
+ : nsPaintedDisplayItem(aBuilder, aFrame,
+ aBuilder->CurrentActiveScrolledRoot()),
+ mList(aBuilder),
+ mOverrideZIndex(0),
+ mHasZIndexOverride(false) {
+ MOZ_COUNT_CTOR(nsDisplayWrapList);
+
+ mBaseBuildingRect = GetBuildingRect();
+
+ mListPtr = &mList;
+ mListPtr->AppendToTop(aItem);
+ mOriginalClipChain = mClipChain;
+ nsDisplayWrapList::UpdateBounds(aBuilder);
+
+ if (!aFrame || !aFrame->IsTransformed()) {
+ return;
+ }
+
+ // See the previous nsDisplayWrapList constructor
+ if (aItem->Frame() == aFrame) {
+ mToReferenceFrame = aItem->ToReferenceFrame();
+ }
+
+ nsRect visible = aBuilder->GetVisibleRect() +
+ aBuilder->GetCurrentFrameOffsetToReferenceFrame();
+
+ SetBuildingRect(visible);
+}
+
+nsDisplayWrapList::~nsDisplayWrapList() { MOZ_COUNT_DTOR(nsDisplayWrapList); }
+
+void nsDisplayWrapList::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect, HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ mListPtr->HitTest(aBuilder, aRect, aState, aOutFrames);
+}
+
+nsRect nsDisplayWrapList::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ return mBounds;
+}
+
+nsRegion nsDisplayWrapList::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ bool snap;
+ return ::mozilla::GetOpaqueRegion(aBuilder, GetChildren(),
+ GetBounds(aBuilder, &snap));
+}
+
+Maybe<nscolor> nsDisplayWrapList::IsUniform(
+ nsDisplayListBuilder* aBuilder) const {
+ // We could try to do something but let's conservatively just return Nothing.
+ return Nothing();
+}
+
+void nsDisplayWrapper::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+ NS_ERROR("nsDisplayWrapper should have been flattened away for painting");
+}
+
+nsRect nsDisplayWrapList::GetComponentAlphaBounds(
+ nsDisplayListBuilder* aBuilder) const {
+ return mListPtr->GetComponentAlphaBounds(aBuilder);
+}
+
+bool nsDisplayWrapList::CreateWebRenderCommandsNewClipListOption(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder, bool aNewClipList) {
+ aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
+ GetChildren(), this, aDisplayListBuilder, aSc, aBuilder, aResources,
+ aNewClipList);
+ return true;
+}
+
+static nsresult WrapDisplayList(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, nsDisplayList* aList,
+ nsDisplayItemWrapper* aWrapper) {
+ if (!aList->GetTop()) {
+ return NS_OK;
+ }
+ nsDisplayItem* item = aWrapper->WrapList(aBuilder, aFrame, aList);
+ if (!item) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ // aList was emptied
+ aList->AppendToTop(item);
+ return NS_OK;
+}
+
+static nsresult WrapEachDisplayItem(nsDisplayListBuilder* aBuilder,
+ nsDisplayList* aList,
+ nsDisplayItemWrapper* aWrapper) {
+ for (nsDisplayItem* item : aList->TakeItems()) {
+ item = aWrapper->WrapItem(aBuilder, item);
+ if (!item) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ aList->AppendToTop(item);
+ }
+ // aList was emptied
+ return NS_OK;
+}
+
+nsresult nsDisplayItemWrapper::WrapLists(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame,
+ const nsDisplayListSet& aIn,
+ const nsDisplayListSet& aOut) {
+ nsresult rv = WrapListsInPlace(aBuilder, aFrame, aIn);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ if (&aOut == &aIn) {
+ return NS_OK;
+ }
+ aOut.BorderBackground()->AppendToTop(aIn.BorderBackground());
+ aOut.BlockBorderBackgrounds()->AppendToTop(aIn.BlockBorderBackgrounds());
+ aOut.Floats()->AppendToTop(aIn.Floats());
+ aOut.Content()->AppendToTop(aIn.Content());
+ aOut.PositionedDescendants()->AppendToTop(aIn.PositionedDescendants());
+ aOut.Outlines()->AppendToTop(aIn.Outlines());
+ return NS_OK;
+}
+
+nsresult nsDisplayItemWrapper::WrapListsInPlace(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ const nsDisplayListSet& aLists) {
+ nsresult rv;
+ if (WrapBorderBackground()) {
+ // Our border-backgrounds are in-flow
+ rv = WrapDisplayList(aBuilder, aFrame, aLists.BorderBackground(), this);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+ // Our block border-backgrounds are in-flow
+ rv = WrapDisplayList(aBuilder, aFrame, aLists.BlockBorderBackgrounds(), this);
+ NS_ENSURE_SUCCESS(rv, rv);
+ // The floats are not in flow
+ rv = WrapEachDisplayItem(aBuilder, aLists.Floats(), this);
+ NS_ENSURE_SUCCESS(rv, rv);
+ // Our child content is in flow
+ rv = WrapDisplayList(aBuilder, aFrame, aLists.Content(), this);
+ NS_ENSURE_SUCCESS(rv, rv);
+ // The positioned descendants may not be in-flow
+ rv = WrapEachDisplayItem(aBuilder, aLists.PositionedDescendants(), this);
+ NS_ENSURE_SUCCESS(rv, rv);
+ // The outlines may not be in-flow
+ return WrapEachDisplayItem(aBuilder, aLists.Outlines(), this);
+}
+
+nsDisplayOpacity::nsDisplayOpacity(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot, bool aForEventsOnly,
+ bool aNeedsActiveLayer, bool aWrapsBackdropFilter)
+ : nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot, true),
+ mOpacity(aFrame->StyleEffects()->mOpacity),
+ mForEventsOnly(aForEventsOnly),
+ mNeedsActiveLayer(aNeedsActiveLayer),
+ mChildOpacityState(ChildOpacityState::Unknown),
+ mWrapsBackdropFilter(aWrapsBackdropFilter) {
+ MOZ_COUNT_CTOR(nsDisplayOpacity);
+}
+
+void nsDisplayOpacity::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect,
+ nsDisplayItem::HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ AutoRestore<float> opacity(aState->mCurrentOpacity);
+ aState->mCurrentOpacity *= mOpacity;
+
+ // TODO(emilio): special-casing zero is a bit arbitrary... Maybe we should
+ // only consider fully opaque items? Or make this configurable somehow?
+ if (aBuilder->HitTestIsForVisibility() && mOpacity == 0.0f) {
+ return;
+ }
+ nsDisplayWrapList::HitTest(aBuilder, aRect, aState, aOutFrames);
+}
+
+nsRegion nsDisplayOpacity::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ // The only time where mOpacity == 1.0 should be when we have will-change.
+ // We could report this as opaque then but when the will-change value starts
+ // animating the element would become non opaque and could cause repaints.
+ return nsRegion();
+}
+
+void nsDisplayOpacity::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+ if (GetOpacity() == 0.0f) {
+ return;
+ }
+
+ if (GetOpacity() == 1.0f) {
+ GetChildren()->Paint(aBuilder, aCtx,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+ return;
+ }
+
+ // TODO: Compute a bounds rect to pass to PushLayer for a smaller
+ // allocation.
+ aCtx->GetDrawTarget()->PushLayer(false, GetOpacity(), nullptr, gfx::Matrix());
+ GetChildren()->Paint(aBuilder, aCtx,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+ aCtx->GetDrawTarget()->PopLayer();
+}
+
+/* static */
+bool nsDisplayOpacity::NeedsActiveLayer(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame) {
+ return EffectCompositor::HasAnimationsForCompositor(
+ aFrame, DisplayItemType::TYPE_OPACITY) ||
+ (ActiveLayerTracker::IsStyleAnimated(
+ aBuilder, aFrame, nsCSSPropertyIDSet::OpacityProperties()));
+}
+
+bool nsDisplayOpacity::CanApplyOpacity(WebRenderLayerManager* aManager,
+ nsDisplayListBuilder* aBuilder) const {
+ return !EffectCompositor::HasAnimationsForCompositor(
+ mFrame, DisplayItemType::TYPE_OPACITY);
+}
+
+// Only try folding our opacity down if we have at most |kOpacityMaxChildCount|
+// children that don't overlap and can all apply the opacity to themselves.
+static const size_t kOpacityMaxChildCount = 3;
+
+// |kOpacityMaxListSize| defines an early exit condition for opacity items that
+// are likely have more child items than |kOpacityMaxChildCount|.
+static const size_t kOpacityMaxListSize = kOpacityMaxChildCount * 2;
+
+/**
+ * Recursively iterates through |aList| and collects at most
+ * |kOpacityMaxChildCount| display item pointers to items that return true for
+ * CanApplyOpacity(). The item pointers are added to |aArray|.
+ *
+ * LayerEventRegions and WrapList items are ignored.
+ *
+ * We need to do this recursively, because the child display items might contain
+ * nested nsDisplayWrapLists.
+ *
+ * Returns false if there are more than |kOpacityMaxChildCount| items, or if an
+ * item that returns false for CanApplyOpacity() is encountered.
+ * Otherwise returns true.
+ */
+static bool CollectItemsWithOpacity(WebRenderLayerManager* aManager,
+ nsDisplayListBuilder* aBuilder,
+ nsDisplayList* aList,
+ nsTArray<nsPaintedDisplayItem*>& aArray) {
+ if (aList->Length() > kOpacityMaxListSize) {
+ // Exit early, since |aList| will likely contain more than
+ // |kOpacityMaxChildCount| items.
+ return false;
+ }
+
+ for (nsDisplayItem* i : *aList) {
+ const DisplayItemType type = i->GetType();
+
+ if (type == DisplayItemType::TYPE_COMPOSITOR_HITTEST_INFO) {
+ continue;
+ }
+
+ // Descend only into wraplists.
+ if (type == DisplayItemType::TYPE_WRAP_LIST ||
+ type == DisplayItemType::TYPE_CONTAINER) {
+ // The current display item has children, process them first.
+ if (!CollectItemsWithOpacity(aManager, aBuilder, i->GetChildren(),
+ aArray)) {
+ return false;
+ }
+
+ continue;
+ }
+
+ if (aArray.Length() == kOpacityMaxChildCount) {
+ return false;
+ }
+
+ auto* item = i->AsPaintedDisplayItem();
+ if (!item || !item->CanApplyOpacity(aManager, aBuilder)) {
+ return false;
+ }
+
+ aArray.AppendElement(item);
+ }
+
+ return true;
+}
+
+bool nsDisplayOpacity::CanApplyToChildren(WebRenderLayerManager* aManager,
+ nsDisplayListBuilder* aBuilder) {
+ if (mChildOpacityState == ChildOpacityState::Deferred) {
+ return false;
+ }
+
+ // Iterate through the child display list and copy at most
+ // |kOpacityMaxChildCount| child display item pointers to a temporary list.
+ AutoTArray<nsPaintedDisplayItem*, kOpacityMaxChildCount> items;
+ if (!CollectItemsWithOpacity(aManager, aBuilder, &mList, items)) {
+ mChildOpacityState = ChildOpacityState::Deferred;
+ return false;
+ }
+
+ struct {
+ nsPaintedDisplayItem* item{};
+ nsRect bounds;
+ } children[kOpacityMaxChildCount];
+
+ bool snap;
+ size_t childCount = 0;
+ for (nsPaintedDisplayItem* item : items) {
+ children[childCount].item = item;
+ children[childCount].bounds = item->GetBounds(aBuilder, &snap);
+ childCount++;
+ }
+
+ for (size_t i = 0; i < childCount; i++) {
+ for (size_t j = i + 1; j < childCount; j++) {
+ if (children[i].bounds.Intersects(children[j].bounds)) {
+ mChildOpacityState = ChildOpacityState::Deferred;
+ return false;
+ }
+ }
+ }
+
+ mChildOpacityState = ChildOpacityState::Applied;
+ return true;
+}
+
+/**
+ * Returns true if this nsDisplayOpacity contains only a filter or a mask item
+ * that has the same frame as the opacity item, and that supports painting with
+ * opacity. In this case the opacity item can be optimized away.
+ */
+bool nsDisplayOpacity::ApplyToMask() {
+ if (mList.Length() != 1) {
+ return false;
+ }
+
+ nsDisplayItem* item = mList.GetBottom();
+ if (item->Frame() != mFrame) {
+ // The effect item needs to have the same frame as the opacity item.
+ return false;
+ }
+
+ const DisplayItemType type = item->GetType();
+ if (type == DisplayItemType::TYPE_MASK) {
+ return true;
+ }
+
+ return false;
+}
+
+bool nsDisplayOpacity::CanApplyOpacityToChildren(
+ WebRenderLayerManager* aManager, nsDisplayListBuilder* aBuilder,
+ float aInheritedOpacity) {
+ if (mFrame->GetPrevContinuation() || mFrame->GetNextContinuation() ||
+ mFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
+ // If we've been split, then we might need to merge, so
+ // don't flatten us away.
+ return false;
+ }
+
+ if (mNeedsActiveLayer || mOpacity == 0.0) {
+ // If our opacity is zero then we'll discard all descendant display items
+ // except for layer event regions, so there's no point in doing this
+ // optimization (and if we do do it, then invalidations of those descendants
+ // might trigger repainting).
+ return false;
+ }
+
+ if (mList.IsEmpty()) {
+ return false;
+ }
+
+ // We can only flatten opacity items into a mask if we haven't
+ // already flattened an earlier ancestor, since the SVG code pulls the opacity
+ // from style directly, and won't know about the outer opacity value.
+ if (aInheritedOpacity == 1.0f && ApplyToMask()) {
+ MOZ_ASSERT(SVGIntegrationUtils::UsingEffectsForFrame(mFrame));
+ mChildOpacityState = ChildOpacityState::Applied;
+ return true;
+ }
+
+ // Return true if we successfully applied opacity to child items.
+ return CanApplyToChildren(aManager, aBuilder);
+}
+
+void nsDisplayOpacity::ComputeInvalidationRegion(
+ nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
+ nsRegion* aInvalidRegion) const {
+ const auto* geometry =
+ static_cast<const nsDisplayOpacityGeometry*>(aGeometry);
+
+ bool snap;
+ if (mOpacity != geometry->mOpacity) {
+ aInvalidRegion->Or(GetBounds(aBuilder, &snap), geometry->mBounds);
+ }
+}
+
+void nsDisplayOpacity::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << " (opacity " << mOpacity << ", mChildOpacityState: ";
+ switch (mChildOpacityState) {
+ case ChildOpacityState::Unknown:
+ aStream << "Unknown";
+ break;
+ case ChildOpacityState::Applied:
+ aStream << "Applied";
+ break;
+ case ChildOpacityState::Deferred:
+ aStream << "Deferred";
+ break;
+ default:
+ break;
+ }
+
+ aStream << ")";
+}
+
+bool nsDisplayOpacity::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ MOZ_ASSERT(mChildOpacityState != ChildOpacityState::Applied);
+ float oldOpacity = aBuilder.GetInheritedOpacity();
+ const DisplayItemClipChain* oldClipChain = aBuilder.GetInheritedClipChain();
+ aBuilder.SetInheritedOpacity(1.0f);
+ aBuilder.SetInheritedClipChain(nullptr);
+ float opacity = mOpacity * oldOpacity;
+ float* opacityForSC = &opacity;
+
+ uint64_t animationsId =
+ AddAnimationsForWebRender(this, aManager, aDisplayListBuilder);
+ wr::WrAnimationProperty prop{
+ wr::WrAnimationType::Opacity,
+ animationsId,
+ };
+
+ wr::StackingContextParams params;
+ params.animation = animationsId ? &prop : nullptr;
+ params.opacity = opacityForSC;
+ params.clip =
+ wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
+ if (mWrapsBackdropFilter) {
+ params.flags |= wr::StackingContextFlags::WRAPS_BACKDROP_FILTER;
+ }
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
+ params);
+
+ aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
+ &mList, this, aDisplayListBuilder, sc, aBuilder, aResources);
+ aBuilder.SetInheritedOpacity(oldOpacity);
+ aBuilder.SetInheritedClipChain(oldClipChain);
+ return true;
+}
+
+nsDisplayBlendMode::nsDisplayBlendMode(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ StyleBlend aBlendMode, const ActiveScrolledRoot* aActiveScrolledRoot,
+ const bool aIsForBackground)
+ : nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot, true),
+ mBlendMode(aBlendMode),
+ mIsForBackground(aIsForBackground) {
+ MOZ_COUNT_CTOR(nsDisplayBlendMode);
+}
+
+nsRegion nsDisplayBlendMode::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ // We are never considered opaque
+ return nsRegion();
+}
+
+bool nsDisplayBlendMode::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ wr::StackingContextParams params;
+ params.mix_blend_mode =
+ wr::ToMixBlendMode(nsCSSRendering::GetGFXBlendMode(mBlendMode));
+ params.clip =
+ wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
+ params);
+
+ return nsDisplayWrapList::CreateWebRenderCommands(
+ aBuilder, aResources, sc, aManager, aDisplayListBuilder);
+}
+
+void nsDisplayBlendMode::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ // This should be switched to use PushLayerWithBlend, once it's
+ // been implemented for all DrawTarget backends.
+ DrawTarget* dt = aCtx->GetDrawTarget();
+ int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+ Rect rect = NSRectToRect(GetPaintRect(aBuilder, aCtx), appUnitsPerDevPixel);
+ rect.RoundOut();
+
+ // Create a temporary DrawTarget that is clipped to the area that
+ // we're going to draw to. This will include the same transform as
+ // is currently on |dt|.
+ RefPtr<DrawTarget> temp =
+ dt->CreateClippedDrawTarget(rect, SurfaceFormat::B8G8R8A8);
+ if (!temp) {
+ return;
+ }
+
+ gfxContext ctx(temp, /* aPreserveTransform */ true);
+
+ GetChildren()->Paint(aBuilder, &ctx,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+
+ // Draw the temporary DT to the real destination, applying the blend mode, but
+ // no transform.
+ temp->Flush();
+ RefPtr<SourceSurface> surface = temp->Snapshot();
+ gfxContextMatrixAutoSaveRestore saveMatrix(aCtx);
+ dt->SetTransform(Matrix());
+ dt->DrawSurface(
+ surface, Rect(surface->GetRect()), Rect(surface->GetRect()),
+ DrawSurfaceOptions(),
+ DrawOptions(1.0f, nsCSSRendering::GetGFXBlendMode(mBlendMode)));
+}
+
+gfx::CompositionOp nsDisplayBlendMode::BlendMode() {
+ return nsCSSRendering::GetGFXBlendMode(mBlendMode);
+}
+
+bool nsDisplayBlendMode::CanMerge(const nsDisplayItem* aItem) const {
+ // Items for the same content element should be merged into a single
+ // compositing group.
+ if (!HasDifferentFrame(aItem) || !HasSameTypeAndClip(aItem) ||
+ !HasSameContent(aItem)) {
+ return false;
+ }
+
+ const auto* item = static_cast<const nsDisplayBlendMode*>(aItem);
+ if (mIsForBackground || item->mIsForBackground) {
+ // Don't merge background-blend-mode items
+ return false;
+ }
+
+ return true;
+}
+
+/* static */
+nsDisplayBlendContainer* nsDisplayBlendContainer::CreateForMixBlendMode(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot) {
+ return MakeDisplayItem<nsDisplayBlendContainer>(aBuilder, aFrame, aList,
+ aActiveScrolledRoot, false);
+}
+
+/* static */
+nsDisplayBlendContainer* nsDisplayBlendContainer::CreateForBackgroundBlendMode(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
+ nsDisplayList* aList, const ActiveScrolledRoot* aActiveScrolledRoot) {
+ if (aSecondaryFrame) {
+ auto type = GetTableTypeFromFrame(aFrame);
+ auto index = static_cast<uint16_t>(type);
+
+ return MakeDisplayItemWithIndex<nsDisplayTableBlendContainer>(
+ aBuilder, aSecondaryFrame, index, aList, aActiveScrolledRoot, true,
+ aFrame);
+ }
+
+ return MakeDisplayItemWithIndex<nsDisplayBlendContainer>(
+ aBuilder, aFrame, 1, aList, aActiveScrolledRoot, true);
+}
+
+nsDisplayBlendContainer::nsDisplayBlendContainer(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot, bool aIsForBackground)
+ : nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot, true),
+ mIsForBackground(aIsForBackground) {
+ MOZ_COUNT_CTOR(nsDisplayBlendContainer);
+}
+
+void nsDisplayBlendContainer::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ aCtx->GetDrawTarget()->PushLayer(false, 1.0, nullptr, gfx::Matrix());
+ GetChildren()->Paint(aBuilder, aCtx,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+ aCtx->GetDrawTarget()->PopLayer();
+}
+
+bool nsDisplayBlendContainer::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ wr::StackingContextParams params;
+ params.flags |= wr::StackingContextFlags::IS_BLEND_CONTAINER;
+ params.clip =
+ wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
+ params);
+
+ return nsDisplayWrapList::CreateWebRenderCommands(
+ aBuilder, aResources, sc, aManager, aDisplayListBuilder);
+}
+
+nsDisplayOwnLayer::nsDisplayOwnLayer(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot,
+ nsDisplayOwnLayerFlags aFlags, const ScrollbarData& aScrollbarData,
+ bool aForceActive, bool aClearClipChain)
+ : nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot,
+ aClearClipChain),
+ mFlags(aFlags),
+ mScrollbarData(aScrollbarData),
+ mForceActive(aForceActive),
+ mWrAnimationId(0) {
+ MOZ_COUNT_CTOR(nsDisplayOwnLayer);
+}
+
+bool nsDisplayOwnLayer::IsScrollThumbLayer() const {
+ return mScrollbarData.mScrollbarLayerType == ScrollbarLayerType::Thumb;
+}
+
+bool nsDisplayOwnLayer::IsScrollbarContainer() const {
+ return mScrollbarData.mScrollbarLayerType == ScrollbarLayerType::Container;
+}
+
+bool nsDisplayOwnLayer::IsRootScrollbarContainer() const {
+ if (!IsScrollbarContainer()) {
+ return false;
+ }
+
+ return mFrame->PresContext()->IsRootContentDocumentCrossProcess() &&
+ mScrollbarData.mTargetViewId ==
+ nsLayoutUtils::ScrollIdForRootScrollFrame(mFrame->PresContext());
+}
+
+bool nsDisplayOwnLayer::IsZoomingLayer() const {
+ return GetType() == DisplayItemType::TYPE_ASYNC_ZOOM;
+}
+
+bool nsDisplayOwnLayer::IsFixedPositionLayer() const {
+ return GetType() == DisplayItemType::TYPE_FIXED_POSITION;
+}
+
+bool nsDisplayOwnLayer::IsStickyPositionLayer() const {
+ return GetType() == DisplayItemType::TYPE_STICKY_POSITION;
+}
+
+bool nsDisplayOwnLayer::HasDynamicToolbar() const {
+ if (!mFrame->PresContext()->IsRootContentDocumentCrossProcess()) {
+ return false;
+ }
+ return mFrame->PresContext()->HasDynamicToolbar() ||
+ // For tests on Android, this pref is set to simulate the dynamic
+ // toolbar
+ StaticPrefs::apz_fixed_margin_override_enabled();
+}
+
+bool nsDisplayOwnLayer::ShouldFixedAndStickyContentGetAnimationIds() const {
+#if defined(MOZ_WIDGET_ANDROID)
+ return mFrame->PresContext()->IsRootContentDocumentCrossProcess();
+#else
+ return false;
+#endif
+}
+
+bool nsDisplayOwnLayer::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ Maybe<wr::WrAnimationProperty> prop;
+ bool needsProp = aManager->LayerManager()->AsyncPanZoomEnabled() &&
+ (IsScrollThumbLayer() || IsZoomingLayer() ||
+ (IsFixedPositionLayer() &&
+ ShouldFixedAndStickyContentGetAnimationIds()) ||
+ (IsStickyPositionLayer() &&
+ ShouldFixedAndStickyContentGetAnimationIds()) ||
+ (IsRootScrollbarContainer() && HasDynamicToolbar()));
+
+ if (needsProp) {
+ // APZ is enabled and this is a scroll thumb or zooming layer, so we need
+ // to create and set an animation id. That way APZ can adjust the position/
+ // zoom of this content asynchronously as needed.
+ RefPtr<WebRenderAPZAnimationData> animationData =
+ aManager->CommandBuilder()
+ .CreateOrRecycleWebRenderUserData<WebRenderAPZAnimationData>(this);
+ mWrAnimationId = animationData->GetAnimationId();
+
+ prop.emplace();
+ prop->id = mWrAnimationId;
+ prop->key = wr::SpatialKey(uint64_t(mFrame), GetPerFrameKey(),
+ wr::SpatialKeyKind::APZ);
+ prop->effect_type = wr::WrAnimationType::Transform;
+ }
+
+ wr::StackingContextParams params;
+ params.animation = prop.ptrOr(nullptr);
+ params.clip =
+ wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
+ if (IsScrollbarContainer() && IsRootScrollbarContainer()) {
+ params.prim_flags |= wr::PrimitiveFlags::IS_SCROLLBAR_CONTAINER;
+ }
+ if (IsZoomingLayer() ||
+ ((IsFixedPositionLayer() &&
+ ShouldFixedAndStickyContentGetAnimationIds()) ||
+ (IsStickyPositionLayer() &&
+ ShouldFixedAndStickyContentGetAnimationIds()) ||
+ (IsRootScrollbarContainer() && HasDynamicToolbar()))) {
+ params.is_2d_scale_translation = true;
+ params.should_snap = true;
+ }
+
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
+ params);
+
+ nsDisplayWrapList::CreateWebRenderCommands(aBuilder, aResources, sc, aManager,
+ aDisplayListBuilder);
+ return true;
+}
+
+bool nsDisplayOwnLayer::UpdateScrollData(WebRenderScrollData* aData,
+ WebRenderLayerScrollData* aLayerData) {
+ bool isRelevantToApz =
+ (IsScrollThumbLayer() || IsScrollbarContainer() || IsZoomingLayer() ||
+ (IsFixedPositionLayer() &&
+ ShouldFixedAndStickyContentGetAnimationIds()) ||
+ (IsStickyPositionLayer() &&
+ ShouldFixedAndStickyContentGetAnimationIds()));
+
+ if (!isRelevantToApz) {
+ return false;
+ }
+
+ if (!aLayerData) {
+ return true;
+ }
+
+ if (IsZoomingLayer()) {
+ aLayerData->SetZoomAnimationId(mWrAnimationId);
+ return true;
+ }
+
+ if (IsFixedPositionLayer() && ShouldFixedAndStickyContentGetAnimationIds()) {
+ aLayerData->SetFixedPositionAnimationId(mWrAnimationId);
+ return true;
+ }
+
+ if (IsStickyPositionLayer() && ShouldFixedAndStickyContentGetAnimationIds()) {
+ aLayerData->SetStickyPositionAnimationId(mWrAnimationId);
+ return true;
+ }
+
+ MOZ_ASSERT(IsScrollbarContainer() || IsScrollThumbLayer());
+
+ aLayerData->SetScrollbarData(mScrollbarData);
+
+ if (IsRootScrollbarContainer() && HasDynamicToolbar()) {
+ aLayerData->SetScrollbarAnimationId(mWrAnimationId);
+ return true;
+ }
+
+ if (IsScrollThumbLayer()) {
+ aLayerData->SetScrollbarAnimationId(mWrAnimationId);
+ LayoutDeviceRect bounds = LayoutDeviceIntRect::FromAppUnits(
+ mBounds, mFrame->PresContext()->AppUnitsPerDevPixel());
+ // We use a resolution of 1.0 because this is a WebRender codepath which
+ // always uses containerless scrolling, and so resolution doesn't apply to
+ // scrollbars.
+ LayerIntRect layerBounds =
+ RoundedOut(bounds * LayoutDeviceToLayerScale(1.0f));
+ aLayerData->SetVisibleRegion(LayerIntRegion(layerBounds));
+ }
+ return true;
+}
+
+void nsDisplayOwnLayer::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << nsPrintfCString(" (flags 0x%x) (scrolltarget %" PRIu64 ")",
+ (int)mFlags, mScrollbarData.mTargetViewId)
+ .get();
+}
+
+nsDisplaySubDocument::nsDisplaySubDocument(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame,
+ nsSubDocumentFrame* aSubDocFrame,
+ nsDisplayList* aList,
+ nsDisplayOwnLayerFlags aFlags)
+ : nsDisplayOwnLayer(aBuilder, aFrame, aList,
+ aBuilder->CurrentActiveScrolledRoot(), aFlags),
+ mScrollParentId(aBuilder->GetCurrentScrollParentId()),
+ mShouldFlatten(false),
+ mSubDocFrame(aSubDocFrame) {
+ MOZ_COUNT_CTOR(nsDisplaySubDocument);
+
+ if (mSubDocFrame && mSubDocFrame != mFrame) {
+ mSubDocFrame->AddDisplayItem(this);
+ }
+}
+
+nsDisplaySubDocument::~nsDisplaySubDocument() {
+ MOZ_COUNT_DTOR(nsDisplaySubDocument);
+ if (mSubDocFrame) {
+ mSubDocFrame->RemoveDisplayItem(this);
+ }
+}
+
+nsIFrame* nsDisplaySubDocument::FrameForInvalidation() const {
+ return mSubDocFrame ? mSubDocFrame : mFrame;
+}
+
+void nsDisplaySubDocument::RemoveFrame(nsIFrame* aFrame) {
+ if (aFrame == mSubDocFrame) {
+ mSubDocFrame = nullptr;
+ SetDeletedFrame();
+ }
+ nsDisplayOwnLayer::RemoveFrame(aFrame);
+}
+
+static bool UseDisplayPortForViewport(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame) {
+ return aBuilder->IsPaintingToWindow() &&
+ DisplayPortUtils::ViewportHasDisplayPort(aFrame->PresContext());
+}
+
+nsRect nsDisplaySubDocument::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ bool usingDisplayPort = UseDisplayPortForViewport(aBuilder, mFrame);
+
+ if ((mFlags & nsDisplayOwnLayerFlags::GenerateScrollableLayer) &&
+ usingDisplayPort) {
+ *aSnap = false;
+ return mFrame->GetRect() + aBuilder->ToReferenceFrame(mFrame);
+ }
+
+ return nsDisplayOwnLayer::GetBounds(aBuilder, aSnap);
+}
+
+nsRegion nsDisplaySubDocument::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ bool usingDisplayPort = UseDisplayPortForViewport(aBuilder, mFrame);
+
+ if ((mFlags & nsDisplayOwnLayerFlags::GenerateScrollableLayer) &&
+ usingDisplayPort) {
+ *aSnap = false;
+ return nsRegion();
+ }
+
+ return nsDisplayOwnLayer::GetOpaqueRegion(aBuilder, aSnap);
+}
+
+/* static */
+nsDisplayFixedPosition* nsDisplayFixedPosition::CreateForFixedBackground(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
+ nsDisplayBackgroundImage* aImage, const uint16_t aIndex,
+ const ActiveScrolledRoot* aScrollTargetASR) {
+ nsDisplayList temp(aBuilder);
+ temp.AppendToTop(aImage);
+
+ if (aSecondaryFrame) {
+ auto tableType = GetTableTypeFromFrame(aFrame);
+ const uint16_t index = CalculateTablePerFrameKey(aIndex + 1, tableType);
+ return MakeDisplayItemWithIndex<nsDisplayTableFixedPosition>(
+ aBuilder, aSecondaryFrame, index, &temp, aFrame, aScrollTargetASR);
+ }
+
+ return MakeDisplayItemWithIndex<nsDisplayFixedPosition>(
+ aBuilder, aFrame, aIndex + 1, &temp, aScrollTargetASR);
+}
+
+nsDisplayFixedPosition::nsDisplayFixedPosition(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot,
+ const ActiveScrolledRoot* aScrollTargetASR)
+ : nsDisplayOwnLayer(aBuilder, aFrame, aList, aActiveScrolledRoot),
+ mScrollTargetASR(aScrollTargetASR),
+ mIsFixedBackground(false) {
+ MOZ_COUNT_CTOR(nsDisplayFixedPosition);
+}
+
+nsDisplayFixedPosition::nsDisplayFixedPosition(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aScrollTargetASR)
+ : nsDisplayOwnLayer(aBuilder, aFrame, aList,
+ aBuilder->CurrentActiveScrolledRoot()),
+ // For fixed backgrounds, this is the ASR for the nearest scroll frame.
+ mScrollTargetASR(aScrollTargetASR),
+ mIsFixedBackground(true) {
+ MOZ_COUNT_CTOR(nsDisplayFixedPosition);
+}
+
+ScrollableLayerGuid::ViewID nsDisplayFixedPosition::GetScrollTargetId() {
+ if (mScrollTargetASR &&
+ (mIsFixedBackground || !nsLayoutUtils::IsReallyFixedPos(mFrame))) {
+ return mScrollTargetASR->GetViewId();
+ }
+ return nsLayoutUtils::ScrollIdForRootScrollFrame(mFrame->PresContext());
+}
+
+bool nsDisplayFixedPosition::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ SideBits sides = SideBits::eNone;
+ if (!mIsFixedBackground) {
+ sides = nsLayoutUtils::GetSideBitsForFixedPositionContent(mFrame);
+ }
+
+ // We install this RAII scrolltarget tracker so that any
+ // nsDisplayCompositorHitTestInfo items inside this fixed-pos item (and that
+ // share the same ASR as this item) use the correct scroll target. That way
+ // attempts to scroll on those items will scroll the root scroll frame.
+ wr::DisplayListBuilder::FixedPosScrollTargetTracker tracker(
+ aBuilder, GetActiveScrolledRoot(), GetScrollTargetId(), sides);
+ return nsDisplayOwnLayer::CreateWebRenderCommands(
+ aBuilder, aResources, aSc, aManager, aDisplayListBuilder);
+}
+
+bool nsDisplayFixedPosition::UpdateScrollData(
+ WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
+ if (aLayerData) {
+ if (!mIsFixedBackground) {
+ aLayerData->SetFixedPositionSides(
+ nsLayoutUtils::GetSideBitsForFixedPositionContent(mFrame));
+ }
+ aLayerData->SetFixedPositionScrollContainerId(GetScrollTargetId());
+ }
+ nsDisplayOwnLayer::UpdateScrollData(aData, aLayerData);
+ return true;
+}
+
+void nsDisplayFixedPosition::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << nsPrintfCString(
+ " (containerASR %s) (scrolltarget %" PRIu64 ")",
+ ActiveScrolledRoot::ToString(mScrollTargetASR).get(),
+ GetScrollTargetId())
+ .get();
+}
+
+TableType GetTableTypeFromFrame(nsIFrame* aFrame) {
+ if (aFrame->IsTableFrame()) {
+ return TableType::Table;
+ }
+
+ if (aFrame->IsTableColFrame()) {
+ return TableType::TableCol;
+ }
+
+ if (aFrame->IsTableColGroupFrame()) {
+ return TableType::TableColGroup;
+ }
+
+ if (aFrame->IsTableRowFrame()) {
+ return TableType::TableRow;
+ }
+
+ if (aFrame->IsTableRowGroupFrame()) {
+ return TableType::TableRowGroup;
+ }
+
+ if (aFrame->IsTableCellFrame()) {
+ return TableType::TableCell;
+ }
+
+ MOZ_ASSERT_UNREACHABLE("Invalid frame.");
+ return TableType::Table;
+}
+
+nsDisplayTableFixedPosition::nsDisplayTableFixedPosition(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ nsIFrame* aAncestorFrame, const ActiveScrolledRoot* aScrollTargetASR)
+ : nsDisplayFixedPosition(aBuilder, aFrame, aList, aScrollTargetASR),
+ mAncestorFrame(aAncestorFrame) {
+ if (aBuilder->IsRetainingDisplayList()) {
+ mAncestorFrame->AddDisplayItem(this);
+ }
+}
+
+nsDisplayStickyPosition::nsDisplayStickyPosition(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot,
+ const ActiveScrolledRoot* aContainerASR, bool aClippedToDisplayPort)
+ : nsDisplayOwnLayer(aBuilder, aFrame, aList, aActiveScrolledRoot),
+ mContainerASR(aContainerASR),
+ mClippedToDisplayPort(aClippedToDisplayPort),
+ mShouldFlatten(false) {
+ MOZ_COUNT_CTOR(nsDisplayStickyPosition);
+}
+
+// Returns the smallest distance from "0" to the range [min, max] where
+// min <= max. Despite the name, the return value is actually a 1-D vector,
+// and so may be negative if max < 0.
+static nscoord DistanceToRange(nscoord min, nscoord max) {
+ MOZ_ASSERT(min <= max);
+ if (max < 0) {
+ return max;
+ }
+ if (min > 0) {
+ return min;
+ }
+ MOZ_ASSERT(min <= 0 && max >= 0);
+ return 0;
+}
+
+// Returns the magnitude of the part of the range [min, max] that is greater
+// than zero. The return value is always non-negative.
+static nscoord PositivePart(nscoord min, nscoord max) {
+ MOZ_ASSERT(min <= max);
+ if (min >= 0) {
+ return max - min;
+ }
+ if (max > 0) {
+ return max;
+ }
+ return 0;
+}
+
+// Returns the magnitude of the part of the range [min, max] that is less
+// than zero. The return value is always non-negative.
+static nscoord NegativePart(nscoord min, nscoord max) {
+ MOZ_ASSERT(min <= max);
+ if (max <= 0) {
+ return max - min;
+ }
+ if (min < 0) {
+ return 0 - min;
+ }
+ return 0;
+}
+
+StickyScrollContainer* nsDisplayStickyPosition::GetStickyScrollContainer() {
+ StickyScrollContainer* stickyScrollContainer =
+ StickyScrollContainer::GetStickyScrollContainerForFrame(mFrame);
+ if (stickyScrollContainer) {
+ // If there's no ASR for the scrollframe that this sticky item is attached
+ // to, then don't create a WR sticky item for it either. Trying to do so
+ // will end in sadness because WR will interpret some coordinates as
+ // relative to the nearest enclosing scrollframe, which will correspond
+ // to the nearest ancestor ASR on the gecko side. That ASR will not be the
+ // same as the scrollframe this sticky item is actually supposed to be
+ // attached to, thus the sadness.
+ // Not sending WR the sticky item is ok, because the enclosing scrollframe
+ // will never be asynchronously scrolled. Instead we will always position
+ // the sticky items correctly on the gecko side and WR will never need to
+ // adjust their position itself.
+ MOZ_ASSERT(
+ stickyScrollContainer->ScrollFrame()->IsMaybeAsynchronouslyScrolled());
+ if (!stickyScrollContainer->ScrollFrame()
+ ->IsMaybeAsynchronouslyScrolled()) {
+ stickyScrollContainer = nullptr;
+ }
+ }
+ return stickyScrollContainer;
+}
+
+bool nsDisplayStickyPosition::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ StickyScrollContainer* stickyScrollContainer = GetStickyScrollContainer();
+
+ Maybe<wr::SpaceAndClipChainHelper> saccHelper;
+
+ if (stickyScrollContainer) {
+ float auPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+
+ bool snap;
+ nsRect itemBounds = GetBounds(aDisplayListBuilder, &snap);
+
+ Maybe<float> topMargin;
+ Maybe<float> rightMargin;
+ Maybe<float> bottomMargin;
+ Maybe<float> leftMargin;
+ wr::StickyOffsetBounds vBounds = {0.0, 0.0};
+ wr::StickyOffsetBounds hBounds = {0.0, 0.0};
+ nsPoint appliedOffset;
+
+ nsRectAbsolute outer;
+ nsRectAbsolute inner;
+ stickyScrollContainer->GetScrollRanges(mFrame, &outer, &inner);
+
+ nsIFrame* scrollFrame = do_QueryFrame(stickyScrollContainer->ScrollFrame());
+ nsPoint offset =
+ scrollFrame->GetOffsetToCrossDoc(Frame()) + ToReferenceFrame();
+
+ // Adjust the scrollPort coordinates to be relative to the reference frame,
+ // so that it is in the same space as everything else.
+ nsRect scrollPort =
+ stickyScrollContainer->ScrollFrame()->GetScrollPortRect();
+ scrollPort += offset;
+
+ // The following computations make more sense upon understanding the
+ // semantics of "inner" and "outer", which is explained in the comment on
+ // SetStickyPositionData in Layers.h.
+
+ if (outer.YMost() != inner.YMost()) {
+ // Question: How far will itemBounds.y be from the top of the scrollport
+ // when we have scrolled from the current scroll position of "0" to
+ // reach the range [inner.YMost(), outer.YMost()] where the item gets
+ // stuck?
+ // Answer: the current distance is "itemBounds.y - scrollPort.y". That
+ // needs to be adjusted by the distance to the range, less any other
+ // sticky ranges that fall between 0 and the range. If the distance is
+ // negative (i.e. inner.YMost() <= outer.YMost() < 0) then we would be
+ // scrolling upwards (decreasing scroll offset) to reach that range,
+ // which would increase itemBounds.y and make it farther away from the
+ // top of the scrollport. So in that case the adjustment is -distance.
+ // If the distance is positive (0 < inner.YMost() <= outer.YMost()) then
+ // we would be scrolling downwards, itemBounds.y would decrease, and we
+ // again need to adjust by -distance. If we are already in the range
+ // then no adjustment is needed and distance is 0 so again using
+ // -distance works. If the distance is positive, and the item has both
+ // top and bottom sticky ranges, then the bottom sticky range may fall
+ // (entirely[1] or partly[2]) between the current scroll position.
+ // [1]: 0 <= outer.Y() <= inner.Y() < inner.YMost() <= outer.YMost()
+ // [2]: outer.Y() < 0 <= inner.Y() < inner.YMost() <= outer.YMost()
+ // In these cases, the item doesn't actually move for that part of the
+ // distance, so we need to subtract out that bit, which can be computed
+ // as the positive portion of the range [outer.Y(), inner.Y()].
+ nscoord distance = DistanceToRange(inner.YMost(), outer.YMost());
+ if (distance > 0) {
+ distance -= PositivePart(outer.Y(), inner.Y());
+ }
+ topMargin = Some(NSAppUnitsToFloatPixels(
+ itemBounds.y - scrollPort.y - distance, auPerDevPixel));
+ // Question: What is the maximum positive ("downward") offset that WR
+ // will have to apply to this item in order to prevent the item from
+ // visually moving?
+ // Answer: Since the item is "sticky" in the range [inner.YMost(),
+ // outer.YMost()], the maximum offset will be the size of the range, which
+ // is outer.YMost() - inner.YMost().
+ vBounds.max =
+ NSAppUnitsToFloatPixels(outer.YMost() - inner.YMost(), auPerDevPixel);
+ // Question: how much of an offset has layout already applied to the item?
+ // Answer: if we are
+ // (a) inside the sticky range (inner.YMost() < 0 <= outer.YMost()), or
+ // (b) past the sticky range (inner.YMost() < outer.YMost() < 0)
+ // then layout has already applied some offset to the position of the
+ // item. The amount of the adjustment is |0 - inner.YMost()| in case (a)
+ // and |outer.YMost() - inner.YMost()| in case (b).
+ if (inner.YMost() < 0) {
+ appliedOffset.y = std::min(0, outer.YMost()) - inner.YMost();
+ MOZ_ASSERT(appliedOffset.y > 0);
+ }
+ }
+ if (outer.Y() != inner.Y()) {
+ // Similar logic as in the previous section, but this time we care about
+ // the distance from itemBounds.YMost() to scrollPort.YMost().
+ nscoord distance = DistanceToRange(outer.Y(), inner.Y());
+ if (distance < 0) {
+ distance += NegativePart(inner.YMost(), outer.YMost());
+ }
+ bottomMargin = Some(NSAppUnitsToFloatPixels(
+ scrollPort.YMost() - itemBounds.YMost() + distance, auPerDevPixel));
+ // And here WR will be moving the item upwards rather than downwards so
+ // again things are inverted from the previous block.
+ vBounds.min =
+ NSAppUnitsToFloatPixels(outer.Y() - inner.Y(), auPerDevPixel);
+ // We can't have appliedOffset be both positive and negative, and the top
+ // adjustment takes priority. So here we only update appliedOffset.y if
+ // it wasn't set by the top-sticky case above.
+ if (appliedOffset.y == 0 && inner.Y() > 0) {
+ appliedOffset.y = std::max(0, outer.Y()) - inner.Y();
+ MOZ_ASSERT(appliedOffset.y < 0);
+ }
+ }
+ // Same as above, but for the x-axis
+ if (outer.XMost() != inner.XMost()) {
+ nscoord distance = DistanceToRange(inner.XMost(), outer.XMost());
+ if (distance > 0) {
+ distance -= PositivePart(outer.X(), inner.X());
+ }
+ leftMargin = Some(NSAppUnitsToFloatPixels(
+ itemBounds.x - scrollPort.x - distance, auPerDevPixel));
+ hBounds.max =
+ NSAppUnitsToFloatPixels(outer.XMost() - inner.XMost(), auPerDevPixel);
+ if (inner.XMost() < 0) {
+ appliedOffset.x = std::min(0, outer.XMost()) - inner.XMost();
+ MOZ_ASSERT(appliedOffset.x > 0);
+ }
+ }
+ if (outer.X() != inner.X()) {
+ nscoord distance = DistanceToRange(outer.X(), inner.X());
+ if (distance < 0) {
+ distance += NegativePart(inner.XMost(), outer.XMost());
+ }
+ rightMargin = Some(NSAppUnitsToFloatPixels(
+ scrollPort.XMost() - itemBounds.XMost() + distance, auPerDevPixel));
+ hBounds.min =
+ NSAppUnitsToFloatPixels(outer.X() - inner.X(), auPerDevPixel);
+ if (appliedOffset.x == 0 && inner.X() > 0) {
+ appliedOffset.x = std::max(0, outer.X()) - inner.X();
+ MOZ_ASSERT(appliedOffset.x < 0);
+ }
+ }
+
+ LayoutDeviceRect bounds =
+ LayoutDeviceRect::FromAppUnits(itemBounds, auPerDevPixel);
+ wr::LayoutVector2D applied = {
+ NSAppUnitsToFloatPixels(appliedOffset.x, auPerDevPixel),
+ NSAppUnitsToFloatPixels(appliedOffset.y, auPerDevPixel)};
+ wr::WrSpatialId spatialId = aBuilder.DefineStickyFrame(
+ wr::ToLayoutRect(bounds), topMargin.ptrOr(nullptr),
+ rightMargin.ptrOr(nullptr), bottomMargin.ptrOr(nullptr),
+ leftMargin.ptrOr(nullptr), vBounds, hBounds, applied,
+ wr::SpatialKey(uint64_t(mFrame), GetPerFrameKey(),
+ wr::SpatialKeyKind::Sticky));
+
+ saccHelper.emplace(aBuilder, spatialId);
+ aManager->CommandBuilder().PushOverrideForASR(mContainerASR, spatialId);
+ }
+
+ {
+ wr::StackingContextParams params;
+ params.clip =
+ wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this,
+ aBuilder, params);
+ nsDisplayOwnLayer::CreateWebRenderCommands(aBuilder, aResources, sc,
+ aManager, aDisplayListBuilder);
+ }
+
+ if (stickyScrollContainer) {
+ aManager->CommandBuilder().PopOverrideForASR(mContainerASR);
+ }
+
+ return true;
+}
+
+void nsDisplayStickyPosition::CalculateLayerScrollRanges(
+ StickyScrollContainer* aStickyScrollContainer, float aAppUnitsPerDevPixel,
+ float aScaleX, float aScaleY, LayerRectAbsolute& aStickyOuter,
+ LayerRectAbsolute& aStickyInner) {
+ nsRectAbsolute outer;
+ nsRectAbsolute inner;
+ aStickyScrollContainer->GetScrollRanges(mFrame, &outer, &inner);
+ aStickyOuter.SetBox(
+ NSAppUnitsToFloatPixels(outer.X(), aAppUnitsPerDevPixel) * aScaleX,
+ NSAppUnitsToFloatPixels(outer.Y(), aAppUnitsPerDevPixel) * aScaleY,
+ NSAppUnitsToFloatPixels(outer.XMost(), aAppUnitsPerDevPixel) * aScaleX,
+ NSAppUnitsToFloatPixels(outer.YMost(), aAppUnitsPerDevPixel) * aScaleY);
+ aStickyInner.SetBox(
+ NSAppUnitsToFloatPixels(inner.X(), aAppUnitsPerDevPixel) * aScaleX,
+ NSAppUnitsToFloatPixels(inner.Y(), aAppUnitsPerDevPixel) * aScaleY,
+ NSAppUnitsToFloatPixels(inner.XMost(), aAppUnitsPerDevPixel) * aScaleX,
+ NSAppUnitsToFloatPixels(inner.YMost(), aAppUnitsPerDevPixel) * aScaleY);
+}
+
+bool nsDisplayStickyPosition::UpdateScrollData(
+ WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
+ bool hasDynamicToolbar = HasDynamicToolbar();
+ if (aLayerData && hasDynamicToolbar) {
+ StickyScrollContainer* stickyScrollContainer = GetStickyScrollContainer();
+ if (stickyScrollContainer) {
+ float auPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+ float cumulativeResolution =
+ mFrame->PresShell()->GetCumulativeResolution();
+ LayerRectAbsolute stickyOuter;
+ LayerRectAbsolute stickyInner;
+ CalculateLayerScrollRanges(stickyScrollContainer, auPerDevPixel,
+ cumulativeResolution, cumulativeResolution,
+ stickyOuter, stickyInner);
+ aLayerData->SetStickyScrollRangeOuter(stickyOuter);
+ aLayerData->SetStickyScrollRangeInner(stickyInner);
+
+ SideBits sides =
+ nsLayoutUtils::GetSideBitsForFixedPositionContent(mFrame);
+ aLayerData->SetFixedPositionSides(sides);
+
+ ScrollableLayerGuid::ViewID scrollId =
+ nsLayoutUtils::FindOrCreateIDFor(stickyScrollContainer->ScrollFrame()
+ ->GetScrolledFrame()
+ ->GetContent());
+ aLayerData->SetStickyPositionScrollContainerId(scrollId);
+ }
+ }
+ // Return true if either there is a dynamic toolbar affecting this sticky
+ // item or the OwnLayer base implementation returns true for some other
+ // reason.
+ bool ret = hasDynamicToolbar;
+ ret |= nsDisplayOwnLayer::UpdateScrollData(aData, aLayerData);
+ return ret;
+}
+
+nsDisplayScrollInfoLayer::nsDisplayScrollInfoLayer(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aScrolledFrame,
+ nsIFrame* aScrollFrame, const CompositorHitTestInfo& aHitInfo,
+ const nsRect& aHitArea)
+ : nsDisplayWrapList(aBuilder, aScrollFrame),
+ mScrollFrame(aScrollFrame),
+ mScrolledFrame(aScrolledFrame),
+ mScrollParentId(aBuilder->GetCurrentScrollParentId()),
+ mHitInfo(aHitInfo),
+ mHitArea(aHitArea) {
+#ifdef NS_BUILD_REFCNT_LOGGING
+ MOZ_COUNT_CTOR(nsDisplayScrollInfoLayer);
+#endif
+}
+
+UniquePtr<ScrollMetadata> nsDisplayScrollInfoLayer::ComputeScrollMetadata(
+ nsDisplayListBuilder* aBuilder, WebRenderLayerManager* aLayerManager) {
+ ScrollMetadata metadata = nsLayoutUtils::ComputeScrollMetadata(
+ mScrolledFrame, mScrollFrame, mScrollFrame->GetContent(), Frame(),
+ ToReferenceFrame(), aLayerManager, mScrollParentId,
+ mScrollFrame->GetSize(), false);
+ metadata.GetMetrics().SetIsScrollInfoLayer(true);
+ nsIScrollableFrame* scrollableFrame = mScrollFrame->GetScrollTargetFrame();
+ if (scrollableFrame) {
+ aBuilder->AddScrollFrameToNotify(scrollableFrame);
+ }
+
+ return UniquePtr<ScrollMetadata>(new ScrollMetadata(metadata));
+}
+
+bool nsDisplayScrollInfoLayer::UpdateScrollData(
+ WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
+ if (aLayerData) {
+ UniquePtr<ScrollMetadata> metadata =
+ ComputeScrollMetadata(aData->GetBuilder(), aData->GetManager());
+ MOZ_ASSERT(aData);
+ MOZ_ASSERT(metadata);
+ aLayerData->AppendScrollMetadata(*aData, *metadata);
+ }
+ return true;
+}
+
+bool nsDisplayScrollInfoLayer::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ ScrollableLayerGuid::ViewID scrollId =
+ nsLayoutUtils::FindOrCreateIDFor(mScrollFrame->GetContent());
+
+ const LayoutDeviceRect devRect = LayoutDeviceRect::FromAppUnits(
+ mHitArea, mScrollFrame->PresContext()->AppUnitsPerDevPixel());
+
+ const wr::LayoutRect rect = wr::ToLayoutRect(devRect);
+
+ aBuilder.PushHitTest(rect, rect, !BackfaceIsHidden(), scrollId, mHitInfo,
+ SideBits::eNone);
+
+ return true;
+}
+
+void nsDisplayScrollInfoLayer::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << " (scrollframe " << mScrollFrame << " scrolledFrame "
+ << mScrolledFrame << ")";
+}
+
+nsDisplayZoom::nsDisplayZoom(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+ nsSubDocumentFrame* aSubDocFrame,
+ nsDisplayList* aList, int32_t aAPD,
+ int32_t aParentAPD, nsDisplayOwnLayerFlags aFlags)
+ : nsDisplaySubDocument(aBuilder, aFrame, aSubDocFrame, aList, aFlags),
+ mAPD(aAPD),
+ mParentAPD(aParentAPD) {
+ MOZ_COUNT_CTOR(nsDisplayZoom);
+}
+
+nsRect nsDisplayZoom::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ nsRect bounds = nsDisplaySubDocument::GetBounds(aBuilder, aSnap);
+ *aSnap = false;
+ return bounds.ScaleToOtherAppUnitsRoundOut(mAPD, mParentAPD);
+}
+
+void nsDisplayZoom::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
+ HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ nsRect rect;
+ // A 1x1 rect indicates we are just hit testing a point, so pass down a 1x1
+ // rect as well instead of possibly rounding the width or height to zero.
+ if (aRect.width == 1 && aRect.height == 1) {
+ rect.MoveTo(aRect.TopLeft().ScaleToOtherAppUnits(mParentAPD, mAPD));
+ rect.width = rect.height = 1;
+ } else {
+ rect = aRect.ScaleToOtherAppUnitsRoundOut(mParentAPD, mAPD);
+ }
+ mList.HitTest(aBuilder, rect, aState, aOutFrames);
+}
+
+nsDisplayAsyncZoom::nsDisplayAsyncZoom(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot, FrameMetrics::ViewID aViewID)
+ : nsDisplayOwnLayer(aBuilder, aFrame, aList, aActiveScrolledRoot),
+ mViewID(aViewID) {
+ MOZ_COUNT_CTOR(nsDisplayAsyncZoom);
+}
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+nsDisplayAsyncZoom::~nsDisplayAsyncZoom() {
+ MOZ_COUNT_DTOR(nsDisplayAsyncZoom);
+}
+#endif
+
+void nsDisplayAsyncZoom::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect, HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+#ifdef DEBUG
+ nsIScrollableFrame* scrollFrame = do_QueryFrame(mFrame);
+ MOZ_ASSERT(scrollFrame && ViewportUtils::IsZoomedContentRoot(
+ scrollFrame->GetScrolledFrame()));
+#endif
+ nsRect rect = ViewportUtils::VisualToLayout(aRect, mFrame->PresShell());
+ mList.HitTest(aBuilder, rect, aState, aOutFrames);
+}
+
+bool nsDisplayAsyncZoom::UpdateScrollData(
+ WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
+ bool ret = nsDisplayOwnLayer::UpdateScrollData(aData, aLayerData);
+ MOZ_ASSERT(ret);
+ if (aLayerData) {
+ aLayerData->SetAsyncZoomContainerId(mViewID);
+ }
+ return ret;
+}
+
+///////////////////////////////////////////////////
+// nsDisplayTransform Implementation
+//
+
+#ifndef DEBUG
+static_assert(sizeof(nsDisplayTransform) <= 512,
+ "nsDisplayTransform has grown");
+#endif
+
+nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, nsDisplayList* aList,
+ const nsRect& aChildrenBuildingRect)
+ : nsPaintedDisplayItem(aBuilder, aFrame),
+ mChildren(aBuilder),
+ mTransform(Some(Matrix4x4())),
+ mChildrenBuildingRect(aChildrenBuildingRect),
+ mPrerenderDecision(PrerenderDecision::No),
+ mIsTransformSeparator(true),
+ mHasTransformGetter(false),
+ mHasAssociatedPerspective(false) {
+ MOZ_COUNT_CTOR(nsDisplayTransform);
+ MOZ_ASSERT(aFrame, "Must have a frame!");
+ Init(aBuilder, aList);
+}
+
+nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, nsDisplayList* aList,
+ const nsRect& aChildrenBuildingRect,
+ PrerenderDecision aPrerenderDecision)
+ : nsPaintedDisplayItem(aBuilder, aFrame),
+ mChildren(aBuilder),
+ mChildrenBuildingRect(aChildrenBuildingRect),
+ mPrerenderDecision(aPrerenderDecision),
+ mIsTransformSeparator(false),
+ mHasTransformGetter(false),
+ mHasAssociatedPerspective(false) {
+ MOZ_COUNT_CTOR(nsDisplayTransform);
+ MOZ_ASSERT(aFrame, "Must have a frame!");
+ SetReferenceFrameToAncestor(aBuilder);
+ Init(aBuilder, aList);
+}
+
+nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, nsDisplayList* aList,
+ const nsRect& aChildrenBuildingRect,
+ decltype(WithTransformGetter))
+ : nsPaintedDisplayItem(aBuilder, aFrame),
+ mChildren(aBuilder),
+ mChildrenBuildingRect(aChildrenBuildingRect),
+ mPrerenderDecision(PrerenderDecision::No),
+ mIsTransformSeparator(false),
+ mHasTransformGetter(true),
+ mHasAssociatedPerspective(false) {
+ MOZ_COUNT_CTOR(nsDisplayTransform);
+ MOZ_ASSERT(aFrame, "Must have a frame!");
+ MOZ_ASSERT(aFrame->GetTransformGetter());
+ Init(aBuilder, aList);
+}
+
+void nsDisplayTransform::SetReferenceFrameToAncestor(
+ nsDisplayListBuilder* aBuilder) {
+ if (mFrame == aBuilder->RootReferenceFrame()) {
+ return;
+ }
+ // We manually recompute mToReferenceFrame without going through the
+ // builder, since this won't apply the 'additional offset'. Our
+ // children will already be painting with that applied, and we don't
+ // want to include it a second time in our transform. We don't recompute
+ // our visible/building rects, since those should still include the additional
+ // offset.
+ // TODO: Are there are things computed using our ToReferenceFrame that should
+ // have the additional offset applied? Should we instead just manually remove
+ // the offset from our transform instead of this more general value?
+ // Can we instead apply the additional offset to us and not our children, like
+ // we do for all other offsets (and how reference frames are supposed to
+ // work)?
+ nsIFrame* outerFrame = nsLayoutUtils::GetCrossDocParentFrameInProcess(mFrame);
+ const nsIFrame* referenceFrame = aBuilder->FindReferenceFrameFor(outerFrame);
+ mToReferenceFrame = mFrame->GetOffsetToCrossDoc(referenceFrame);
+}
+
+void nsDisplayTransform::Init(nsDisplayListBuilder* aBuilder,
+ nsDisplayList* aChildren) {
+ mChildren.AppendToTop(aChildren);
+ UpdateBounds(aBuilder);
+}
+
+bool nsDisplayTransform::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) {
+ return false;
+}
+
+/* Returns the delta specified by the transform-origin property.
+ * This is a positive delta, meaning that it indicates the direction to move
+ * to get from (0, 0) of the frame to the transform origin. This function is
+ * called off the main thread.
+ */
+/* static */
+Point3D nsDisplayTransform::GetDeltaToTransformOrigin(
+ const nsIFrame* aFrame, TransformReferenceBox& aRefBox,
+ float aAppUnitsPerPixel) {
+ MOZ_ASSERT(aFrame, "Can't get delta for a null frame!");
+ MOZ_ASSERT(aFrame->IsTransformed() || aFrame->BackfaceIsHidden() ||
+ aFrame->Combines3DTransformWithAncestors(),
+ "Shouldn't get a delta for an untransformed frame!");
+
+ if (!aFrame->IsTransformed()) {
+ return Point3D();
+ }
+
+ /* For both of the coordinates, if the value of transform is a
+ * percentage, it's relative to the size of the frame. Otherwise, if it's
+ * a distance, it's already computed for us!
+ */
+ const nsStyleDisplay* display = aFrame->StyleDisplay();
+
+ const StyleTransformOrigin& transformOrigin = display->mTransformOrigin;
+ CSSPoint origin = nsStyleTransformMatrix::Convert2DPosition(
+ transformOrigin.horizontal, transformOrigin.vertical, aRefBox);
+
+ if (aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
+ // SVG frames (unlike other frames) have a reference box that can be (and
+ // typically is) offset from the TopLeft() of the frame. We need to account
+ // for that here.
+ origin.x += CSSPixel::FromAppUnits(aRefBox.X());
+ origin.y += CSSPixel::FromAppUnits(aRefBox.Y());
+ }
+
+ float scale = AppUnitsPerCSSPixel() / float(aAppUnitsPerPixel);
+ float z = transformOrigin.depth._0;
+ return Point3D(origin.x * scale, origin.y * scale, z * scale);
+}
+
+/* static */
+bool nsDisplayTransform::ComputePerspectiveMatrix(const nsIFrame* aFrame,
+ float aAppUnitsPerPixel,
+ Matrix4x4& aOutMatrix) {
+ MOZ_ASSERT(aFrame, "Can't get delta for a null frame!");
+ MOZ_ASSERT(aFrame->IsTransformed() || aFrame->BackfaceIsHidden() ||
+ aFrame->Combines3DTransformWithAncestors(),
+ "Shouldn't get a delta for an untransformed frame!");
+ MOZ_ASSERT(aOutMatrix.IsIdentity(), "Must have a blank output matrix");
+
+ if (!aFrame->IsTransformed()) {
+ return false;
+ }
+
+ // TODO: Is it possible that the perspectiveFrame's bounds haven't been set
+ // correctly yet (similar to the aBoundsOverride case for
+ // GetResultingTransformMatrix)?
+ nsIFrame* perspectiveFrame =
+ aFrame->GetClosestFlattenedTreeAncestorPrimaryFrame();
+ if (!perspectiveFrame) {
+ return false;
+ }
+
+ /* Grab the values for perspective and perspective-origin (if present) */
+ const nsStyleDisplay* perspectiveDisplay = perspectiveFrame->StyleDisplay();
+ if (perspectiveDisplay->mChildPerspective.IsNone()) {
+ return false;
+ }
+
+ MOZ_ASSERT(perspectiveDisplay->mChildPerspective.IsLength());
+ float perspective =
+ perspectiveDisplay->mChildPerspective.AsLength().ToCSSPixels();
+ perspective = std::max(1.0f, perspective);
+ if (perspective < std::numeric_limits<Float>::epsilon()) {
+ return true;
+ }
+
+ TransformReferenceBox refBox(perspectiveFrame);
+
+ Point perspectiveOrigin = nsStyleTransformMatrix::Convert2DPosition(
+ perspectiveDisplay->mPerspectiveOrigin.horizontal,
+ perspectiveDisplay->mPerspectiveOrigin.vertical, refBox,
+ aAppUnitsPerPixel);
+
+ /* GetOffsetTo computes the offset required to move from 0,0 in
+ * perspectiveFrame to 0,0 in aFrame. Although we actually want the inverse of
+ * this, it's faster to compute this way.
+ */
+ nsPoint frameToPerspectiveOffset = -aFrame->GetOffsetTo(perspectiveFrame);
+ Point frameToPerspectiveGfxOffset(
+ NSAppUnitsToFloatPixels(frameToPerspectiveOffset.x, aAppUnitsPerPixel),
+ NSAppUnitsToFloatPixels(frameToPerspectiveOffset.y, aAppUnitsPerPixel));
+
+ /* Move the perspective origin to be relative to aFrame, instead of relative
+ * to the containing block which is how it was specified in the style system.
+ */
+ perspectiveOrigin += frameToPerspectiveGfxOffset;
+
+ aOutMatrix._34 =
+ -1.0 / NSAppUnitsToFloatPixels(CSSPixel::ToAppUnits(perspective),
+ aAppUnitsPerPixel);
+
+ aOutMatrix.ChangeBasis(Point3D(perspectiveOrigin.x, perspectiveOrigin.y, 0));
+ return true;
+}
+
+nsDisplayTransform::FrameTransformProperties::FrameTransformProperties(
+ const nsIFrame* aFrame, TransformReferenceBox& aRefBox,
+ float aAppUnitsPerPixel)
+ : mFrame(aFrame),
+ mTranslate(aFrame->StyleDisplay()->mTranslate),
+ mRotate(aFrame->StyleDisplay()->mRotate),
+ mScale(aFrame->StyleDisplay()->mScale),
+ mTransform(aFrame->StyleDisplay()->mTransform),
+ mMotion(MotionPathUtils::ResolveMotionPath(aFrame, aRefBox)),
+ mToTransformOrigin(
+ GetDeltaToTransformOrigin(aFrame, aRefBox, aAppUnitsPerPixel)) {}
+
+/* Wraps up the transform matrix in a change-of-basis matrix pair that
+ * translates from local coordinate space to transform coordinate space, then
+ * hands it back.
+ */
+Matrix4x4 nsDisplayTransform::GetResultingTransformMatrix(
+ const FrameTransformProperties& aProperties, TransformReferenceBox& aRefBox,
+ float aAppUnitsPerPixel) {
+ return GetResultingTransformMatrixInternal(aProperties, aRefBox, nsPoint(),
+ aAppUnitsPerPixel, 0);
+}
+
+Matrix4x4 nsDisplayTransform::GetResultingTransformMatrix(
+ const nsIFrame* aFrame, const nsPoint& aOrigin, float aAppUnitsPerPixel,
+ uint32_t aFlags) {
+ TransformReferenceBox refBox(aFrame);
+ FrameTransformProperties props(aFrame, refBox, aAppUnitsPerPixel);
+ return GetResultingTransformMatrixInternal(props, refBox, aOrigin,
+ aAppUnitsPerPixel, aFlags);
+}
+
+Matrix4x4 nsDisplayTransform::GetResultingTransformMatrixInternal(
+ const FrameTransformProperties& aProperties, TransformReferenceBox& aRefBox,
+ const nsPoint& aOrigin, float aAppUnitsPerPixel, uint32_t aFlags) {
+ const nsIFrame* frame = aProperties.mFrame;
+ NS_ASSERTION(frame || !(aFlags & INCLUDE_PERSPECTIVE),
+ "Must have a frame to compute perspective!");
+
+ // Get the underlying transform matrix:
+
+ /* Get the matrix, then change its basis to factor in the origin. */
+ Matrix4x4 result;
+ // Call IsSVGTransformed() regardless of the value of
+ // aProperties.HasTransform(), since we still need any
+ // potential parentsChildrenOnlyTransform.
+ Matrix svgTransform, parentsChildrenOnlyTransform;
+ const bool hasSVGTransforms =
+ frame && frame->HasAnyStateBits(NS_FRAME_MAY_BE_TRANSFORMED) &&
+ frame->IsSVGTransformed(&svgTransform, &parentsChildrenOnlyTransform);
+ bool shouldRound = nsLayoutUtils::ShouldSnapToGrid(frame);
+
+ /* Transformed frames always have a transform, or are preserving 3d (and might
+ * still have perspective!) */
+ if (aProperties.HasTransform()) {
+ result = nsStyleTransformMatrix::ReadTransforms(
+ aProperties.mTranslate, aProperties.mRotate, aProperties.mScale,
+ aProperties.mMotion, aProperties.mTransform, aRefBox,
+ aAppUnitsPerPixel);
+ } else if (hasSVGTransforms) {
+ // Correct the translation components for zoom:
+ float pixelsPerCSSPx = AppUnitsPerCSSPixel() / aAppUnitsPerPixel;
+ svgTransform._31 *= pixelsPerCSSPx;
+ svgTransform._32 *= pixelsPerCSSPx;
+ result = Matrix4x4::From2D(svgTransform);
+ }
+
+ // Apply any translation due to 'transform-origin' and/or 'transform-box':
+ result.ChangeBasis(aProperties.mToTransformOrigin);
+
+ // See the comment for SVGContainerFrame::HasChildrenOnlyTransform for
+ // an explanation of what children-only transforms are.
+ const bool parentHasChildrenOnlyTransform =
+ hasSVGTransforms && !parentsChildrenOnlyTransform.IsIdentity();
+
+ if (parentHasChildrenOnlyTransform) {
+ float pixelsPerCSSPx = AppUnitsPerCSSPixel() / aAppUnitsPerPixel;
+ parentsChildrenOnlyTransform._31 *= pixelsPerCSSPx;
+ parentsChildrenOnlyTransform._32 *= pixelsPerCSSPx;
+
+ Point3D frameOffset(
+ NSAppUnitsToFloatPixels(-frame->GetPosition().x, aAppUnitsPerPixel),
+ NSAppUnitsToFloatPixels(-frame->GetPosition().y, aAppUnitsPerPixel), 0);
+ Matrix4x4 parentsChildrenOnlyTransform3D =
+ Matrix4x4::From2D(parentsChildrenOnlyTransform)
+ .ChangeBasis(frameOffset);
+
+ result *= parentsChildrenOnlyTransform3D;
+ }
+
+ Matrix4x4 perspectiveMatrix;
+ bool hasPerspective = aFlags & INCLUDE_PERSPECTIVE;
+ if (hasPerspective) {
+ if (ComputePerspectiveMatrix(frame, aAppUnitsPerPixel, perspectiveMatrix)) {
+ result *= perspectiveMatrix;
+ }
+ }
+
+ if ((aFlags & INCLUDE_PRESERVE3D_ANCESTORS) && frame &&
+ frame->Combines3DTransformWithAncestors()) {
+ // Include the transform set on our parent
+ nsIFrame* parentFrame =
+ frame->GetClosestFlattenedTreeAncestorPrimaryFrame();
+ NS_ASSERTION(parentFrame && parentFrame->IsTransformed() &&
+ parentFrame->Extend3DContext(),
+ "Preserve3D mismatch!");
+ TransformReferenceBox refBox(parentFrame);
+ FrameTransformProperties props(parentFrame, refBox, aAppUnitsPerPixel);
+
+ uint32_t flags =
+ aFlags & (INCLUDE_PRESERVE3D_ANCESTORS | INCLUDE_PERSPECTIVE);
+
+ // If this frame isn't transformed (but we exist for backface-visibility),
+ // then we're not a reference frame so no offset to origin will be added.
+ // Otherwise we need to manually translate into our parent's coordinate
+ // space.
+ if (frame->IsTransformed()) {
+ nsLayoutUtils::PostTranslate(result, frame->GetPosition(),
+ aAppUnitsPerPixel, shouldRound);
+ }
+ Matrix4x4 parent = GetResultingTransformMatrixInternal(
+ props, refBox, nsPoint(0, 0), aAppUnitsPerPixel, flags);
+ result = result * parent;
+ }
+
+ if (aFlags & OFFSET_BY_ORIGIN) {
+ nsLayoutUtils::PostTranslate(result, aOrigin, aAppUnitsPerPixel,
+ shouldRound);
+ }
+
+ return result;
+}
+
+bool nsDisplayOpacity::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) {
+ static constexpr nsCSSPropertyIDSet opacitySet =
+ nsCSSPropertyIDSet::OpacityProperties();
+ if (ActiveLayerTracker::IsStyleAnimated(aBuilder, mFrame, opacitySet)) {
+ return true;
+ }
+
+ EffectCompositor::SetPerformanceWarning(
+ mFrame, opacitySet,
+ AnimationPerformanceWarning(
+ AnimationPerformanceWarning::Type::OpacityFrameInactive));
+
+ return false;
+}
+
+bool nsDisplayTransform::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) {
+ return mPrerenderDecision != PrerenderDecision::No;
+}
+
+bool nsDisplayBackgroundColor::CanUseAsyncAnimations(
+ nsDisplayListBuilder* aBuilder) {
+ return StaticPrefs::gfx_omta_background_color();
+}
+
+static bool IsInStickyPositionedSubtree(const nsIFrame* aFrame) {
+ for (const nsIFrame* frame = aFrame; frame;
+ frame = nsLayoutUtils::GetCrossDocParentFrameInProcess(frame)) {
+ if (frame->IsStickyPositioned()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+static bool ShouldUsePartialPrerender(const nsIFrame* aFrame) {
+ return StaticPrefs::layout_animation_prerender_partial() &&
+ // Bug 1642547: Support partial prerender for position:sticky elements.
+ !IsInStickyPositionedSubtree(aFrame);
+}
+
+/* static */
+auto nsDisplayTransform::ShouldPrerenderTransformedContent(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsRect* aDirtyRect)
+ -> PrerenderInfo {
+ PrerenderInfo result;
+ // If we are in a preserve-3d tree, and we've disallowed async animations, we
+ // return No prerender decision directly.
+ if ((aFrame->Extend3DContext() ||
+ aFrame->Combines3DTransformWithAncestors()) &&
+ !aBuilder->GetPreserves3DAllowAsyncAnimation()) {
+ return result;
+ }
+
+ // Elements whose transform has been modified recently, or which
+ // have a compositor-animated transform, can be prerendered. An element
+ // might have only just had its transform animated in which case
+ // the ActiveLayerManager may not have been notified yet.
+ static constexpr nsCSSPropertyIDSet transformSet =
+ nsCSSPropertyIDSet::TransformLikeProperties();
+ if (!ActiveLayerTracker::IsTransformMaybeAnimated(aFrame) &&
+ !EffectCompositor::HasAnimationsForCompositor(
+ aFrame, DisplayItemType::TYPE_TRANSFORM)) {
+ EffectCompositor::SetPerformanceWarning(
+ aFrame, transformSet,
+ AnimationPerformanceWarning(
+ AnimationPerformanceWarning::Type::TransformFrameInactive));
+
+ // This case happens when we're sure that the frame is not animated and its
+ // preserve-3d ancestors are not, either. So we don't need to pre-render.
+ // However, this decision shouldn't affect the decisions for other frames in
+ // the preserve-3d context. We need this flag to determine whether we should
+ // block async animations on other frames in the current preserve-3d tree.
+ result.mHasAnimations = false;
+ return result;
+ }
+
+ // We should not allow prerender if any ancestor container element has
+ // mask/clip-path effects.
+ //
+ // With prerender and async transform animation, we do not need to restyle an
+ // animated element to respect position changes, since that transform is done
+ // by layer animation. As a result, the container element is not aware of
+ // position change of that containing element and loses the chance to update
+ // the content of mask/clip-path.
+ //
+ // Why do we need to update a mask? This is relative to how we generate a
+ // mask layer in ContainerState::SetupMaskLayerForCSSMask. While creating a
+ // mask layer, to reduce memory usage, we did not choose the size of the
+ // masked element as mask size. Instead, we read the union of bounds of all
+ // children display items by nsDisplayWrapList::GetBounds, which is smaller
+ // than or equal to the masked element's boundary, and use it as the position
+ // size of the mask layer. That union bounds is actually affected by the
+ // geometry of the animated element. To keep the content of mask up to date,
+ // forbidding of prerender is required.
+ for (nsIFrame* container =
+ nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
+ container;
+ container = nsLayoutUtils::GetCrossDocParentFrameInProcess(container)) {
+ const nsStyleSVGReset* svgReset = container->StyleSVGReset();
+ if (svgReset->HasMask() || svgReset->HasClipPath()) {
+ return result;
+ }
+ }
+
+ // If the incoming dirty rect already contains the entire overflow area,
+ // we are already rendering the entire content.
+ nsRect overflow = aFrame->InkOverflowRectRelativeToSelf();
+ // UntransformRect will not touch the output rect (`&untranformedDirtyRect`)
+ // in cases of non-invertible transforms, so we set `untransformedRect` to
+ // `aDirtyRect` as an initial value for such cases.
+ nsRect untransformedDirtyRect = *aDirtyRect;
+ UntransformRect(*aDirtyRect, overflow, aFrame, &untransformedDirtyRect);
+ if (untransformedDirtyRect.Contains(overflow)) {
+ *aDirtyRect = untransformedDirtyRect;
+ result.mDecision = PrerenderDecision::Full;
+ return result;
+ }
+
+ float viewportRatio =
+ StaticPrefs::layout_animation_prerender_viewport_ratio_limit();
+ uint32_t absoluteLimitX =
+ StaticPrefs::layout_animation_prerender_absolute_limit_x();
+ uint32_t absoluteLimitY =
+ StaticPrefs::layout_animation_prerender_absolute_limit_y();
+ nsSize refSize = aBuilder->RootReferenceFrame()->GetSize();
+
+ float resolution = aFrame->PresShell()->GetCumulativeResolution();
+ if (resolution < 1.0f) {
+ refSize.SizeTo(
+ NSCoordSaturatingNonnegativeMultiply(refSize.width, 1.0f / resolution),
+ NSCoordSaturatingNonnegativeMultiply(refSize.height,
+ 1.0f / resolution));
+ }
+
+ // Only prerender if the transformed frame's size is <= a multiple of the
+ // reference frame size (~viewport), and less than an absolute limit.
+ // Both the ratio and the absolute limit are configurable.
+ nscoord maxLength = std::max(nscoord(refSize.width * viewportRatio),
+ nscoord(refSize.height * viewportRatio));
+ nsSize relativeLimit(maxLength, maxLength);
+ nsSize absoluteLimit(
+ aFrame->PresContext()->DevPixelsToAppUnits(absoluteLimitX),
+ aFrame->PresContext()->DevPixelsToAppUnits(absoluteLimitY));
+ nsSize maxSize = Min(relativeLimit, absoluteLimit);
+
+ const auto transform = nsLayoutUtils::GetTransformToAncestor(
+ RelativeTo{aFrame},
+ RelativeTo{nsLayoutUtils::GetDisplayRootFrame(aFrame)});
+ const gfxRect transformedBounds = transform.TransformAndClipBounds(
+ gfxRect(overflow.x, overflow.y, overflow.width, overflow.height),
+ gfxRect::MaxIntRect());
+ const nsSize frameSize =
+ nsSize(transformedBounds.width, transformedBounds.height);
+
+ uint64_t maxLimitArea = uint64_t(maxSize.width) * maxSize.height;
+ uint64_t frameArea = uint64_t(frameSize.width) * frameSize.height;
+ if (frameArea <= maxLimitArea && frameSize <= absoluteLimit) {
+ *aDirtyRect = overflow;
+ result.mDecision = PrerenderDecision::Full;
+ return result;
+ }
+
+ if (ShouldUsePartialPrerender(aFrame)) {
+ *aDirtyRect = nsLayoutUtils::ComputePartialPrerenderArea(
+ aFrame, untransformedDirtyRect, overflow, maxSize);
+ result.mDecision = PrerenderDecision::Partial;
+ return result;
+ }
+
+ if (frameArea > maxLimitArea) {
+ uint64_t appUnitsPerPixel = AppUnitsPerCSSPixel();
+ EffectCompositor::SetPerformanceWarning(
+ aFrame, transformSet,
+ AnimationPerformanceWarning(
+ AnimationPerformanceWarning::Type::ContentTooLargeArea,
+ {
+ int(frameArea / (appUnitsPerPixel * appUnitsPerPixel)),
+ int(maxLimitArea / (appUnitsPerPixel * appUnitsPerPixel)),
+ }));
+ } else {
+ EffectCompositor::SetPerformanceWarning(
+ aFrame, transformSet,
+ AnimationPerformanceWarning(
+ AnimationPerformanceWarning::Type::ContentTooLarge,
+ {
+ nsPresContext::AppUnitsToIntCSSPixels(frameSize.width),
+ nsPresContext::AppUnitsToIntCSSPixels(frameSize.height),
+ nsPresContext::AppUnitsToIntCSSPixels(relativeLimit.width),
+ nsPresContext::AppUnitsToIntCSSPixels(relativeLimit.height),
+ nsPresContext::AppUnitsToIntCSSPixels(absoluteLimit.width),
+ nsPresContext::AppUnitsToIntCSSPixels(absoluteLimit.height),
+ }));
+ }
+
+ return result;
+}
+
+/* If the matrix is singular, or a hidden backface is shown, the frame won't be
+ * visible or hit. */
+static bool IsFrameVisible(nsIFrame* aFrame, const Matrix4x4& aMatrix) {
+ if (aMatrix.IsSingular()) {
+ return false;
+ }
+ if (aFrame->BackfaceIsHidden() && aMatrix.IsBackfaceVisible()) {
+ return false;
+ }
+ return true;
+}
+
+const Matrix4x4Flagged& nsDisplayTransform::GetTransform() const {
+ if (mTransform) {
+ return *mTransform;
+ }
+
+ float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
+
+ if (mHasTransformGetter) {
+ mTransform.emplace((mFrame->GetTransformGetter())(mFrame, scale));
+ Point3D newOrigin =
+ Point3D(NSAppUnitsToFloatPixels(mToReferenceFrame.x, scale),
+ NSAppUnitsToFloatPixels(mToReferenceFrame.y, scale), 0.0f);
+ mTransform->ChangeBasis(newOrigin.x, newOrigin.y, newOrigin.z);
+ } else if (!mIsTransformSeparator) {
+ DebugOnly<bool> isReference = mFrame->IsTransformed() ||
+ mFrame->Combines3DTransformWithAncestors() ||
+ mFrame->Extend3DContext();
+ MOZ_ASSERT(isReference);
+ mTransform.emplace(
+ GetResultingTransformMatrix(mFrame, ToReferenceFrame(), scale,
+ INCLUDE_PERSPECTIVE | OFFSET_BY_ORIGIN));
+ } else {
+ // Use identity matrix
+ mTransform.emplace();
+ }
+
+ return *mTransform;
+}
+
+const Matrix4x4Flagged& nsDisplayTransform::GetInverseTransform() const {
+ if (mInverseTransform) {
+ return *mInverseTransform;
+ }
+
+ MOZ_ASSERT(!GetTransform().IsSingular());
+
+ mInverseTransform.emplace(GetTransform().Inverse());
+
+ return *mInverseTransform;
+}
+
+Matrix4x4 nsDisplayTransform::GetTransformForRendering(
+ LayoutDevicePoint* aOutOrigin) const {
+ if (!mFrame->HasPerspective() || mHasTransformGetter ||
+ mIsTransformSeparator) {
+ if (!mHasTransformGetter && !mIsTransformSeparator && aOutOrigin) {
+ // If aOutOrigin is provided, put the offset to origin into it, because
+ // we need to keep it separate for webrender. The combination of
+ // *aOutOrigin and the returned matrix here should always be equivalent
+ // to what GetTransform() would have returned.
+ float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
+ *aOutOrigin = LayoutDevicePoint::FromAppUnits(ToReferenceFrame(), scale);
+
+ // The rounding behavior should also be the same as GetTransform().
+ if (nsLayoutUtils::ShouldSnapToGrid(mFrame)) {
+ aOutOrigin->Round();
+ }
+ return GetResultingTransformMatrix(mFrame, nsPoint(0, 0), scale,
+ INCLUDE_PERSPECTIVE);
+ }
+ return GetTransform().GetMatrix();
+ }
+ MOZ_ASSERT(!mHasTransformGetter);
+
+ float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
+ // Don't include perspective transform, or the offset to origin, since
+ // nsDisplayPerspective will handle both of those.
+ return GetResultingTransformMatrix(mFrame, ToReferenceFrame(), scale, 0);
+}
+
+const Matrix4x4& nsDisplayTransform::GetAccumulatedPreserved3DTransform(
+ nsDisplayListBuilder* aBuilder) {
+ MOZ_ASSERT(!mFrame->Extend3DContext() || IsLeafOf3DContext());
+
+ if (!IsLeafOf3DContext()) {
+ return GetTransform().GetMatrix();
+ }
+
+ if (!mTransformPreserves3D) {
+ const nsIFrame* establisher; // Establisher of the 3D rendering context.
+ for (establisher = mFrame;
+ establisher && establisher->Combines3DTransformWithAncestors();
+ establisher =
+ establisher->GetClosestFlattenedTreeAncestorPrimaryFrame()) {
+ }
+ const nsIFrame* establisherReference = aBuilder->FindReferenceFrameFor(
+ nsLayoutUtils::GetCrossDocParentFrameInProcess(establisher));
+
+ nsPoint offset = establisher->GetOffsetToCrossDoc(establisherReference);
+ float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
+ uint32_t flags =
+ INCLUDE_PRESERVE3D_ANCESTORS | INCLUDE_PERSPECTIVE | OFFSET_BY_ORIGIN;
+ mTransformPreserves3D = MakeUnique<Matrix4x4>(
+ GetResultingTransformMatrix(mFrame, offset, scale, flags));
+ }
+
+ return *mTransformPreserves3D;
+}
+
+bool nsDisplayTransform::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ // We want to make sure we don't pollute the transform property in the WR
+ // stacking context by including the position of this frame (relative to the
+ // parent reference frame). We need to keep those separate; the position of
+ // this frame goes into the stacking context bounds while the transform goes
+ // into the transform.
+ LayoutDevicePoint position;
+ Matrix4x4 newTransformMatrix = GetTransformForRendering(&position);
+
+ gfx::Matrix4x4* transformForSC = &newTransformMatrix;
+ if (newTransformMatrix.IsIdentity()) {
+ // If the transform is an identity transform, strip it out so that WR
+ // doesn't turn this stacking context into a reference frame, as it
+ // affects positioning. Bug 1345577 tracks a better fix.
+ transformForSC = nullptr;
+
+ // In ChooseScaleAndSetTransform, we round the offset from the reference
+ // frame used to adjust the transform, if there is no transform, or it
+ // is just a translation. We need to do the same here.
+ if (nsLayoutUtils::ShouldSnapToGrid(mFrame)) {
+ position.Round();
+ }
+ }
+
+ auto key = wr::SpatialKey(uint64_t(mFrame), GetPerFrameKey(),
+ wr::SpatialKeyKind::Transform);
+
+ // We don't send animations for transform separator display items.
+ uint64_t animationsId =
+ mIsTransformSeparator
+ ? 0
+ : AddAnimationsForWebRender(
+ this, aManager, aDisplayListBuilder,
+ IsPartialPrerender() ? Some(position) : Nothing());
+ wr::WrAnimationProperty prop{wr::WrAnimationType::Transform, animationsId,
+ key};
+
+ nsDisplayTransform* deferredTransformItem = nullptr;
+ if (!mFrame->ChildrenHavePerspective()) {
+ // If it has perspective, we create a new scroll data via the
+ // UpdateScrollData call because that scenario is more complex. Otherwise
+ // we can just stash the transform on the StackingContextHelper and
+ // apply it to any scroll data that are created inside this
+ // nsDisplayTransform.
+ deferredTransformItem = this;
+ }
+
+ // Determine if we're possibly animated (= would need an active layer in FLB).
+ bool animated = !mIsTransformSeparator &&
+ ActiveLayerTracker::IsTransformMaybeAnimated(Frame());
+
+ wr::StackingContextParams params;
+ params.mBoundTransform = &newTransformMatrix;
+ params.animation = animationsId ? &prop : nullptr;
+
+ wr::WrTransformInfo transform_info;
+ if (transformForSC) {
+ transform_info.transform = wr::ToLayoutTransform(newTransformMatrix);
+ transform_info.key = key;
+ params.mTransformPtr = &transform_info;
+ } else {
+ params.mTransformPtr = nullptr;
+ }
+
+ params.prim_flags = !BackfaceIsHidden()
+ ? wr::PrimitiveFlags::IS_BACKFACE_VISIBLE
+ : wr::PrimitiveFlags{0};
+ params.paired_with_perspective = mHasAssociatedPerspective;
+ params.mDeferredTransformItem = deferredTransformItem;
+ params.mAnimated = animated;
+ // Determine if we would have to rasterize any items in local raster space
+ // (i.e. disable subpixel AA). We don't always need to rasterize locally even
+ // if the stacking context is possibly animated (at the cost of potentially
+ // some false negatives with respect to will-change handling), so we pass in
+ // this determination separately to accurately match with when FLB would
+ // normally disable subpixel AA.
+ params.mRasterizeLocally = animated && Frame()->HasAnimationOfTransform();
+ params.SetPreserve3D(mFrame->Extend3DContext() && !mIsTransformSeparator);
+ params.clip =
+ wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
+
+ LayoutDeviceSize boundsSize = LayoutDeviceSize::FromAppUnits(
+ mChildBounds.Size(), mFrame->PresContext()->AppUnitsPerDevPixel());
+
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
+ params, LayoutDeviceRect(position, boundsSize));
+
+ aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
+ GetChildren(), this, aDisplayListBuilder, sc, aBuilder, aResources);
+ return true;
+}
+
+bool nsDisplayTransform::UpdateScrollData(
+ WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
+ if (!mFrame->ChildrenHavePerspective()) {
+ // This case is handled in CreateWebRenderCommands by stashing the transform
+ // on the stacking context.
+ return false;
+ }
+ if (aLayerData) {
+ aLayerData->SetTransform(GetTransform().GetMatrix());
+ aLayerData->SetTransformIsPerspective(true);
+ }
+ return true;
+}
+
+bool nsDisplayTransform::ShouldSkipTransform(
+ nsDisplayListBuilder* aBuilder) const {
+ return (aBuilder->RootReferenceFrame() == mFrame) &&
+ aBuilder->IsForGenerateGlyphMask();
+}
+
+void nsDisplayTransform::Collect3DTransformLeaves(
+ nsDisplayListBuilder* aBuilder, nsTArray<nsDisplayTransform*>& aLeaves) {
+ if (!IsParticipating3DContext() || IsLeafOf3DContext()) {
+ aLeaves.AppendElement(this);
+ return;
+ }
+
+ FlattenedDisplayListIterator iter(aBuilder, &mChildren);
+ while (iter.HasNext()) {
+ nsDisplayItem* item = iter.GetNextItem();
+ if (item->GetType() == DisplayItemType::TYPE_PERSPECTIVE) {
+ auto* perspective = static_cast<nsDisplayPerspective*>(item);
+ if (!perspective->GetChildren()->GetTop()) {
+ continue;
+ }
+ item = perspective->GetChildren()->GetTop();
+ }
+ if (item->GetType() != DisplayItemType::TYPE_TRANSFORM) {
+ gfxCriticalError() << "Invalid child item within 3D transform of type: "
+ << item->Name();
+ continue;
+ }
+ static_cast<nsDisplayTransform*>(item)->Collect3DTransformLeaves(aBuilder,
+ aLeaves);
+ }
+}
+
+static RefPtr<gfx::Path> BuildPathFromPolygon(const RefPtr<DrawTarget>& aDT,
+ const gfx::Polygon& aPolygon) {
+ MOZ_ASSERT(!aPolygon.IsEmpty());
+
+ RefPtr<PathBuilder> pathBuilder = aDT->CreatePathBuilder();
+ const nsTArray<Point4D>& points = aPolygon.GetPoints();
+
+ pathBuilder->MoveTo(points[0].As2DPoint());
+
+ for (size_t i = 1; i < points.Length(); ++i) {
+ pathBuilder->LineTo(points[i].As2DPoint());
+ }
+
+ pathBuilder->Close();
+ return pathBuilder->Finish();
+}
+
+void nsDisplayTransform::CollectSorted3DTransformLeaves(
+ nsDisplayListBuilder* aBuilder, nsTArray<TransformPolygon>& aLeaves) {
+ std::list<TransformPolygon> inputLayers;
+
+ nsTArray<nsDisplayTransform*> leaves;
+ Collect3DTransformLeaves(aBuilder, leaves);
+ for (nsDisplayTransform* item : leaves) {
+ auto bounds = LayoutDeviceRect::FromAppUnits(
+ item->mChildBounds, item->mFrame->PresContext()->AppUnitsPerDevPixel());
+ Matrix4x4 transform = item->GetAccumulatedPreserved3DTransform(aBuilder);
+
+ if (!IsFrameVisible(item->mFrame, transform)) {
+ continue;
+ }
+ gfx::Polygon polygon =
+ gfx::Polygon::FromRect(gfx::Rect(bounds.ToUnknownRect()));
+
+ polygon.TransformToScreenSpace(transform);
+
+ if (polygon.GetPoints().Length() >= 3) {
+ inputLayers.push_back(TransformPolygon(item, std::move(polygon)));
+ }
+ }
+
+ if (inputLayers.empty()) {
+ return;
+ }
+
+ BSPTree<nsDisplayTransform> tree(inputLayers);
+ nsTArray<TransformPolygon> orderedLayers(tree.GetDrawOrder());
+
+ for (TransformPolygon& polygon : orderedLayers) {
+ Matrix4x4 inverse =
+ polygon.data->GetAccumulatedPreserved3DTransform(aBuilder).Inverse();
+
+ MOZ_ASSERT(polygon.geometry);
+ polygon.geometry->TransformToLayerSpace(inverse);
+ }
+
+ aLeaves = std::move(orderedLayers);
+}
+
+void nsDisplayTransform::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ Paint(aBuilder, aCtx, Nothing());
+}
+
+void nsDisplayTransform::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
+ const Maybe<gfx::Polygon>& aPolygon) {
+ if (IsParticipating3DContext() && !IsLeafOf3DContext()) {
+ MOZ_ASSERT(!aPolygon);
+ nsTArray<TransformPolygon> leaves;
+ CollectSorted3DTransformLeaves(aBuilder, leaves);
+ for (TransformPolygon& item : leaves) {
+ item.data->Paint(aBuilder, aCtx, item.geometry);
+ }
+ return;
+ }
+
+ gfxContextMatrixAutoSaveRestore saveMatrix(aCtx);
+ Matrix4x4 trans = ShouldSkipTransform(aBuilder)
+ ? Matrix4x4()
+ : GetAccumulatedPreserved3DTransform(aBuilder);
+ if (!IsFrameVisible(mFrame, trans)) {
+ return;
+ }
+
+ Matrix trans2d;
+ if (trans.CanDraw2D(&trans2d)) {
+ aCtx->Multiply(ThebesMatrix(trans2d));
+
+ if (aPolygon) {
+ RefPtr<gfx::Path> path =
+ BuildPathFromPolygon(aCtx->GetDrawTarget(), *aPolygon);
+ aCtx->GetDrawTarget()->PushClip(path);
+ }
+
+ GetChildren()->Paint(aBuilder, aCtx,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+
+ if (aPolygon) {
+ aCtx->GetDrawTarget()->PopClip();
+ }
+ return;
+ }
+
+ // TODO: Implement 3d transform handling, including plane splitting and
+ // sorting. See BasicCompositor.
+ auto pixelBounds = LayoutDeviceRect::FromAppUnitsToOutside(
+ mChildBounds, mFrame->PresContext()->AppUnitsPerDevPixel());
+ RefPtr<DrawTarget> untransformedDT =
+ gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
+ IntSize(pixelBounds.Width(), pixelBounds.Height()),
+ SurfaceFormat::B8G8R8A8, true);
+ if (!untransformedDT || !untransformedDT->IsValid()) {
+ return;
+ }
+ untransformedDT->SetTransform(
+ Matrix::Translation(-Point(pixelBounds.X(), pixelBounds.Y())));
+
+ gfxContext groupTarget(untransformedDT, /* aPreserveTransform */ true);
+
+ if (aPolygon) {
+ RefPtr<gfx::Path> path =
+ BuildPathFromPolygon(aCtx->GetDrawTarget(), *aPolygon);
+ aCtx->GetDrawTarget()->PushClip(path);
+ }
+
+ GetChildren()->Paint(aBuilder, &groupTarget,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+
+ if (aPolygon) {
+ aCtx->GetDrawTarget()->PopClip();
+ }
+
+ RefPtr<SourceSurface> untransformedSurf = untransformedDT->Snapshot();
+
+ trans.PreTranslate(pixelBounds.X(), pixelBounds.Y(), 0);
+ aCtx->GetDrawTarget()->Draw3DTransformedSurface(untransformedSurf, trans);
+}
+
+bool nsDisplayTransform::MayBeAnimated(nsDisplayListBuilder* aBuilder) const {
+ // If EffectCompositor::HasAnimationsForCompositor() is true then we can
+ // completely bypass the main thread for this animation, so it is always
+ // worthwhile.
+ // For ActiveLayerTracker::IsTransformAnimated() cases the main thread is
+ // already involved so there is less to be gained.
+ // Therefore we check that the *post-transform* bounds of this item are
+ // big enough to justify an active layer.
+ return EffectCompositor::HasAnimationsForCompositor(
+ mFrame, DisplayItemType::TYPE_TRANSFORM) ||
+ (ActiveLayerTracker::IsTransformAnimated(aBuilder, mFrame));
+}
+
+nsRect nsDisplayTransform::TransformUntransformedBounds(
+ nsDisplayListBuilder* aBuilder, const Matrix4x4Flagged& aMatrix) const {
+ bool snap;
+ const nsRect untransformedBounds = GetUntransformedBounds(aBuilder, &snap);
+ // GetTransform always operates in dev pixels.
+ const float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
+ return nsLayoutUtils::MatrixTransformRect(untransformedBounds, aMatrix,
+ factor);
+}
+
+/**
+ * Returns the bounds for this transform. The bounds are calculated during
+ * display list building and merging, see |nsDisplayTransform::UpdateBounds()|.
+ */
+nsRect nsDisplayTransform::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ return mBounds;
+}
+
+void nsDisplayTransform::ComputeBounds(nsDisplayListBuilder* aBuilder) {
+ MOZ_ASSERT(mFrame->Extend3DContext() || IsLeafOf3DContext());
+
+ /* Some transforms can get empty bounds in 2D, but might get transformed again
+ * and get non-empty bounds. A simple example of this would be a 180 degree
+ * rotation getting applied twice.
+ * We should not depend on transforming bounds level by level.
+ *
+ * This function collects the bounds of this transform and stores it in
+ * nsDisplayListBuilder. If this is not a leaf of a 3D context, we recurse
+ * down and include the bounds of the child transforms.
+ * The bounds are transformed with the accumulated transformation matrix up to
+ * the 3D context root coordinate space.
+ */
+ nsDisplayListBuilder::AutoAccumulateTransform accTransform(aBuilder);
+ accTransform.Accumulate(GetTransform().GetMatrix());
+
+ // Do not dive into another 3D context.
+ if (!IsLeafOf3DContext()) {
+ for (nsDisplayItem* i : *GetChildren()) {
+ i->DoUpdateBoundsPreserves3D(aBuilder);
+ }
+ }
+
+ /* The child transforms that extend 3D context further will have empty bounds,
+ * so the untransformed bounds here is the bounds of all the non-preserve-3d
+ * content under this transform.
+ */
+ const nsRect rect = TransformUntransformedBounds(
+ aBuilder, accTransform.GetCurrentTransform());
+ aBuilder->AccumulateRect(rect);
+}
+
+void nsDisplayTransform::DoUpdateBoundsPreserves3D(
+ nsDisplayListBuilder* aBuilder) {
+ MOZ_ASSERT(mFrame->Combines3DTransformWithAncestors() ||
+ IsTransformSeparator());
+ // Updating is not going through to child 3D context.
+ ComputeBounds(aBuilder);
+}
+
+void nsDisplayTransform::UpdateBounds(nsDisplayListBuilder* aBuilder) {
+ UpdateUntransformedBounds(aBuilder);
+
+ if (IsTransformSeparator()) {
+ MOZ_ASSERT(GetTransform().IsIdentity());
+ mBounds = mChildBounds;
+ return;
+ }
+
+ if (mFrame->Extend3DContext()) {
+ if (!Combines3DTransformWithAncestors()) {
+ // The transform establishes a 3D context. |UpdateBoundsFor3D()| will
+ // collect the bounds from the child transforms.
+ UpdateBoundsFor3D(aBuilder);
+ } else {
+ // With nested 3D transforms, the 2D bounds might not be useful.
+ mBounds = nsRect();
+ }
+
+ return;
+ }
+
+ MOZ_ASSERT(!mFrame->Extend3DContext());
+
+ // We would like to avoid calculating 2D bounds here for nested 3D transforms,
+ // but mix-blend-mode relies on having bounds set. See bug 1556956.
+
+ // A stand-alone transform.
+ mBounds = TransformUntransformedBounds(aBuilder, GetTransform());
+}
+
+void nsDisplayTransform::UpdateBoundsFor3D(nsDisplayListBuilder* aBuilder) {
+ MOZ_ASSERT(mFrame->Extend3DContext() &&
+ !mFrame->Combines3DTransformWithAncestors() &&
+ !IsTransformSeparator());
+
+ // Always start updating from an establisher of a 3D rendering context.
+ nsDisplayListBuilder::AutoAccumulateRect accRect(aBuilder);
+ nsDisplayListBuilder::AutoAccumulateTransform accTransform(aBuilder);
+ accTransform.StartRoot();
+ ComputeBounds(aBuilder);
+ mBounds = aBuilder->GetAccumulatedRect();
+}
+
+void nsDisplayTransform::UpdateUntransformedBounds(
+ nsDisplayListBuilder* aBuilder) {
+ mChildBounds = GetChildren()->GetClippedBoundsWithRespectToASR(
+ aBuilder, mActiveScrolledRoot);
+}
+
+#ifdef DEBUG_HIT
+# include <time.h>
+#endif
+
+/* HitTest does some fun stuff with matrix transforms to obtain the answer. */
+void nsDisplayTransform::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect, HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ if (aState->mInPreserves3D) {
+ GetChildren()->HitTest(aBuilder, aRect, aState, aOutFrames);
+ return;
+ }
+
+ /* Here's how this works:
+ * 1. Get the matrix. If it's singular, abort (clearly we didn't hit
+ * anything).
+ * 2. Invert the matrix.
+ * 3. Use it to transform the rect into the correct space.
+ * 4. Pass that rect down through to the list's version of HitTest.
+ */
+ // GetTransform always operates in dev pixels.
+ float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
+ Matrix4x4 matrix = GetAccumulatedPreserved3DTransform(aBuilder);
+
+ if (!IsFrameVisible(mFrame, matrix)) {
+ return;
+ }
+
+ const bool oldHitOccludingItem = aState->mHitOccludingItem;
+
+ /* We want to go from transformed-space to regular space.
+ * Thus we have to invert the matrix, which normally does
+ * the reverse operation (e.g. regular->transformed)
+ */
+
+ /* Now, apply the transform and pass it down the channel. */
+ matrix.Invert();
+ nsRect resultingRect;
+ // Magic width/height indicating we're hit testing a point, not a rect
+ const bool testingPoint = aRect.width == 1 && aRect.height == 1;
+ if (testingPoint) {
+ Point4D point =
+ matrix.ProjectPoint(Point(NSAppUnitsToFloatPixels(aRect.x, factor),
+ NSAppUnitsToFloatPixels(aRect.y, factor)));
+ if (!point.HasPositiveWCoord()) {
+ return;
+ }
+
+ Point point2d = point.As2DPoint();
+
+ resultingRect =
+ nsRect(NSFloatPixelsToAppUnits(float(point2d.x), factor),
+ NSFloatPixelsToAppUnits(float(point2d.y), factor), 1, 1);
+
+ } else {
+ Rect originalRect(NSAppUnitsToFloatPixels(aRect.x, factor),
+ NSAppUnitsToFloatPixels(aRect.y, factor),
+ NSAppUnitsToFloatPixels(aRect.width, factor),
+ NSAppUnitsToFloatPixels(aRect.height, factor));
+
+ Rect childGfxBounds(NSAppUnitsToFloatPixels(mChildBounds.x, factor),
+ NSAppUnitsToFloatPixels(mChildBounds.y, factor),
+ NSAppUnitsToFloatPixels(mChildBounds.width, factor),
+ NSAppUnitsToFloatPixels(mChildBounds.height, factor));
+
+ Rect rect = matrix.ProjectRectBounds(originalRect, childGfxBounds);
+
+ resultingRect =
+ nsRect(NSFloatPixelsToAppUnits(float(rect.X()), factor),
+ NSFloatPixelsToAppUnits(float(rect.Y()), factor),
+ NSFloatPixelsToAppUnits(float(rect.Width()), factor),
+ NSFloatPixelsToAppUnits(float(rect.Height()), factor));
+ }
+
+ if (resultingRect.IsEmpty()) {
+ return;
+ }
+
+#ifdef DEBUG_HIT
+ printf("Frame: %p\n", dynamic_cast<void*>(mFrame));
+ printf(" Untransformed point: (%f, %f)\n", resultingRect.X(),
+ resultingRect.Y());
+ uint32_t originalFrameCount = aOutFrames.Length();
+#endif
+
+ GetChildren()->HitTest(aBuilder, resultingRect, aState, aOutFrames);
+
+ if (aState->mHitOccludingItem && !testingPoint &&
+ !mChildBounds.Contains(aRect)) {
+ MOZ_ASSERT(aBuilder->HitTestIsForVisibility());
+ // We're hit-testing a rect that's bigger than our child bounds, but
+ // resultingRect is clipped by our bounds (in ProjectRectBounds above), so
+ // we can't stop hit-testing altogether.
+ //
+ // FIXME(emilio): I think this means that theoretically we might include
+ // some frames fully behind other transformed-but-opaque frames? Then again
+ // that's our pre-existing behavior for other untransformed content that
+ // doesn't fill the whole rect. To be fully correct I think we'd need proper
+ // "known occluded region" tracking, but that might be overkill for our
+ // purposes here.
+ aState->mHitOccludingItem = oldHitOccludingItem;
+ }
+
+#ifdef DEBUG_HIT
+ if (originalFrameCount != aOutFrames.Length())
+ printf(" Hit! Time: %f, first frame: %p\n", static_cast<double>(clock()),
+ dynamic_cast<void*>(aOutFrames.ElementAt(0)));
+ printf("=== end of hit test ===\n");
+#endif
+}
+
+float nsDisplayTransform::GetHitDepthAtPoint(nsDisplayListBuilder* aBuilder,
+ const nsPoint& aPoint) {
+ // GetTransform always operates in dev pixels.
+ float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
+ Matrix4x4 matrix = GetAccumulatedPreserved3DTransform(aBuilder);
+
+ NS_ASSERTION(IsFrameVisible(mFrame, matrix),
+ "We can't have hit a frame that isn't visible!");
+
+ Matrix4x4 inverse = matrix;
+ inverse.Invert();
+ Point4D point =
+ inverse.ProjectPoint(Point(NSAppUnitsToFloatPixels(aPoint.x, factor),
+ NSAppUnitsToFloatPixels(aPoint.y, factor)));
+
+ Point point2d = point.As2DPoint();
+
+ Point3D transformed = matrix.TransformPoint(Point3D(point2d.x, point2d.y, 0));
+ return transformed.z;
+}
+
+/* The transform is opaque iff the transform consists solely of scales and
+ * translations and if the underlying content is opaque. Thus if the transform
+ * is of the form
+ *
+ * |a c e|
+ * |b d f|
+ * |0 0 1|
+ *
+ * We need b and c to be zero.
+ *
+ * We also need to check whether the underlying opaque content completely fills
+ * our visible rect. We use UntransformRect which expands to the axis-aligned
+ * bounding rect, but that's OK since if
+ * mStoredList.GetVisibleRect().Contains(untransformedVisible), then it
+ * certainly contains the actual (non-axis-aligned) untransformed rect.
+ */
+nsRegion nsDisplayTransform::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+
+ nsRect untransformedVisible;
+ if (!UntransformBuildingRect(aBuilder, &untransformedVisible)) {
+ return nsRegion();
+ }
+
+ const Matrix4x4Flagged& matrix = GetTransform();
+ Matrix matrix2d;
+ if (!matrix.Is2D(&matrix2d) || !matrix2d.PreservesAxisAlignedRectangles()) {
+ return nsRegion();
+ }
+
+ nsRegion result;
+
+ bool tmpSnap;
+ const nsRect bounds = GetUntransformedBounds(aBuilder, &tmpSnap);
+ const nsRegion opaque =
+ ::mozilla::GetOpaqueRegion(aBuilder, GetChildren(), bounds);
+
+ if (opaque.Contains(untransformedVisible)) {
+ result = GetBuildingRect().Intersect(GetBounds(aBuilder, &tmpSnap));
+ }
+ return result;
+}
+
+nsRect nsDisplayTransform::GetComponentAlphaBounds(
+ nsDisplayListBuilder* aBuilder) const {
+ if (GetChildren()->GetComponentAlphaBounds(aBuilder).IsEmpty()) {
+ return nsRect();
+ }
+
+ bool snap;
+ return GetBounds(aBuilder, &snap);
+}
+
+/* TransformRect takes in as parameters a rectangle (in app space) and returns
+ * the smallest rectangle (in app space) containing the transformed image of
+ * that rectangle. That is, it takes the four corners of the rectangle,
+ * transforms them according to the matrix associated with the specified frame,
+ * then returns the smallest rectangle containing the four transformed points.
+ *
+ * @param aUntransformedBounds The rectangle (in app units) to transform.
+ * @param aFrame The frame whose transformation should be applied.
+ * @param aOrigin The delta from the frame origin to the coordinate space origin
+ * @return The smallest rectangle containing the image of the transformed
+ * rectangle.
+ */
+nsRect nsDisplayTransform::TransformRect(const nsRect& aUntransformedBounds,
+ const nsIFrame* aFrame,
+ TransformReferenceBox& aRefBox) {
+ MOZ_ASSERT(aFrame, "Can't take the transform based on a null frame!");
+
+ float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
+
+ FrameTransformProperties props(aFrame, aRefBox, factor);
+ return nsLayoutUtils::MatrixTransformRect(
+ aUntransformedBounds,
+ GetResultingTransformMatrixInternal(props, aRefBox, nsPoint(), factor,
+ kTransformRectFlags),
+ factor);
+}
+
+bool nsDisplayTransform::UntransformRect(const nsRect& aTransformedBounds,
+ const nsRect& aChildBounds,
+ const nsIFrame* aFrame,
+ nsRect* aOutRect) {
+ MOZ_ASSERT(aFrame, "Can't take the transform based on a null frame!");
+
+ float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
+ Matrix4x4 transform = GetResultingTransformMatrix(aFrame, nsPoint(), factor,
+ kTransformRectFlags);
+ return UntransformRect(aTransformedBounds, aChildBounds, transform, factor,
+ aOutRect);
+}
+
+bool nsDisplayTransform::UntransformRect(const nsRect& aTransformedBounds,
+ const nsRect& aChildBounds,
+ const Matrix4x4& aMatrix,
+ float aAppUnitsPerPixel,
+ nsRect* aOutRect) {
+ if (aMatrix.IsSingular()) {
+ return false;
+ }
+
+ RectDouble result(
+ NSAppUnitsToFloatPixels(aTransformedBounds.x, aAppUnitsPerPixel),
+ NSAppUnitsToFloatPixels(aTransformedBounds.y, aAppUnitsPerPixel),
+ NSAppUnitsToFloatPixels(aTransformedBounds.width, aAppUnitsPerPixel),
+ NSAppUnitsToFloatPixels(aTransformedBounds.height, aAppUnitsPerPixel));
+
+ RectDouble childGfxBounds(
+ NSAppUnitsToFloatPixels(aChildBounds.x, aAppUnitsPerPixel),
+ NSAppUnitsToFloatPixels(aChildBounds.y, aAppUnitsPerPixel),
+ NSAppUnitsToFloatPixels(aChildBounds.width, aAppUnitsPerPixel),
+ NSAppUnitsToFloatPixels(aChildBounds.height, aAppUnitsPerPixel));
+
+ result = aMatrix.Inverse().ProjectRectBounds(result, childGfxBounds);
+ *aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(ThebesRect(result),
+ aAppUnitsPerPixel);
+ return true;
+}
+
+bool nsDisplayTransform::UntransformRect(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect,
+ nsRect* aOutRect) const {
+ if (GetTransform().IsSingular()) {
+ return false;
+ }
+
+ // GetTransform always operates in dev pixels.
+ float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
+ RectDouble result(NSAppUnitsToFloatPixels(aRect.x, factor),
+ NSAppUnitsToFloatPixels(aRect.y, factor),
+ NSAppUnitsToFloatPixels(aRect.width, factor),
+ NSAppUnitsToFloatPixels(aRect.height, factor));
+
+ bool snap;
+ nsRect childBounds = GetUntransformedBounds(aBuilder, &snap);
+ RectDouble childGfxBounds(
+ NSAppUnitsToFloatPixels(childBounds.x, factor),
+ NSAppUnitsToFloatPixels(childBounds.y, factor),
+ NSAppUnitsToFloatPixels(childBounds.width, factor),
+ NSAppUnitsToFloatPixels(childBounds.height, factor));
+
+ /* We want to untransform the matrix, so invert the transformation first! */
+ result = GetInverseTransform().ProjectRectBounds(result, childGfxBounds);
+
+ *aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(ThebesRect(result), factor);
+
+ return true;
+}
+
+void nsDisplayTransform::WriteDebugInfo(std::stringstream& aStream) {
+ aStream << GetTransform().GetMatrix();
+ if (IsTransformSeparator()) {
+ aStream << " transform-separator";
+ }
+ if (IsLeafOf3DContext()) {
+ aStream << " 3d-context-leaf";
+ }
+ if (mFrame->Extend3DContext()) {
+ aStream << " extends-3d-context";
+ }
+ if (mFrame->Combines3DTransformWithAncestors()) {
+ aStream << " combines-3d-with-ancestors";
+ }
+
+ aStream << " prerender(";
+ switch (mPrerenderDecision) {
+ case PrerenderDecision::No:
+ aStream << "no";
+ break;
+ case PrerenderDecision::Partial:
+ aStream << "partial";
+ break;
+ case PrerenderDecision::Full:
+ aStream << "full";
+ break;
+ }
+ aStream << ")";
+ aStream << " childrenBuildingRect" << mChildrenBuildingRect;
+}
+
+nsDisplayPerspective::nsDisplayPerspective(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame,
+ nsDisplayList* aList)
+ : nsPaintedDisplayItem(aBuilder, aFrame), mList(aBuilder) {
+ mList.AppendToTop(aList);
+ MOZ_ASSERT(mList.Length() == 1);
+ MOZ_ASSERT(mList.GetTop()->GetType() == DisplayItemType::TYPE_TRANSFORM);
+}
+
+void nsDisplayPerspective::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ // Just directly recurse into children, since we'll include the persepctive
+ // value in any nsDisplayTransform children.
+ GetChildren()->Paint(aBuilder, aCtx,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+}
+
+nsRegion nsDisplayPerspective::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ if (!GetChildren()->GetTop()) {
+ *aSnap = false;
+ return nsRegion();
+ }
+
+ return GetChildren()->GetTop()->GetOpaqueRegion(aBuilder, aSnap);
+}
+
+bool nsDisplayPerspective::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ float appUnitsPerPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+ Matrix4x4 perspectiveMatrix;
+ DebugOnly<bool> hasPerspective = nsDisplayTransform::ComputePerspectiveMatrix(
+ mFrame, appUnitsPerPixel, perspectiveMatrix);
+ MOZ_ASSERT(hasPerspective, "Why did we create nsDisplayPerspective?");
+
+ /*
+ * ClipListToRange can remove our child after we were created.
+ */
+ if (!GetChildren()->GetTop()) {
+ return false;
+ }
+
+ /*
+ * The resulting matrix is still in the coordinate space of the transformed
+ * frame. Append a translation to the reference frame coordinates.
+ */
+ nsDisplayTransform* transform =
+ static_cast<nsDisplayTransform*>(GetChildren()->GetTop());
+
+ Point3D newOrigin =
+ Point3D(NSAppUnitsToFloatPixels(transform->ToReferenceFrame().x,
+ appUnitsPerPixel),
+ NSAppUnitsToFloatPixels(transform->ToReferenceFrame().y,
+ appUnitsPerPixel),
+ 0.0f);
+ Point3D roundedOrigin(NS_round(newOrigin.x), NS_round(newOrigin.y), 0);
+
+ perspectiveMatrix.PostTranslate(roundedOrigin);
+
+ nsIFrame* perspectiveFrame =
+ mFrame->GetClosestFlattenedTreeAncestorPrimaryFrame();
+
+ // Passing true here is always correct, since perspective always combines
+ // transforms with the descendants. However that'd make WR do a lot of work
+ // that it doesn't really need to do if there aren't other transforms forming
+ // part of the 3D context.
+ //
+ // WR knows how to treat perspective in that case, so the only thing we need
+ // to do is to ensure we pass true when we're involved in a 3d context in any
+ // other way via the transform-style property on either the transformed frame
+ // or the perspective frame in order to not confuse WR's preserve-3d code in
+ // very awful ways.
+ bool preserve3D =
+ mFrame->Extend3DContext() || perspectiveFrame->Extend3DContext();
+
+ wr::StackingContextParams params;
+
+ wr::WrTransformInfo transform_info;
+ transform_info.transform = wr::ToLayoutTransform(perspectiveMatrix);
+ transform_info.key = wr::SpatialKey(uint64_t(mFrame), GetPerFrameKey(),
+ wr::SpatialKeyKind::Perspective);
+ params.mTransformPtr = &transform_info;
+
+ params.reference_frame_kind = wr::WrReferenceFrameKind::Perspective;
+ params.prim_flags = !BackfaceIsHidden()
+ ? wr::PrimitiveFlags::IS_BACKFACE_VISIBLE
+ : wr::PrimitiveFlags{0};
+ params.SetPreserve3D(preserve3D);
+ params.clip =
+ wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
+
+ Maybe<uint64_t> scrollingRelativeTo;
+ for (const auto* asr = GetActiveScrolledRoot(); asr; asr = asr->mParent) {
+ // In OOP documents, the root scrollable frame of the in-process root
+ // document is always active, so using IsAncestorFrameCrossDocInProcess
+ // should be fine here.
+ if (nsLayoutUtils::IsAncestorFrameCrossDocInProcess(
+ asr->mScrollableFrame->GetScrolledFrame(), perspectiveFrame)) {
+ scrollingRelativeTo.emplace(asr->GetViewId());
+ break;
+ }
+ }
+
+ // We put the perspective reference frame wrapping the transformed frame,
+ // even though there may be arbitrarily nested scroll frames in between.
+ //
+ // We need to know how many ancestor scroll-frames are we nested in, in order
+ // for the async scrolling code in WebRender to calculate the right
+ // transformation for the perspective contents.
+ params.scrolling_relative_to = scrollingRelativeTo.ptrOr(nullptr);
+
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
+ params);
+
+ aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
+ GetChildren(), this, aDisplayListBuilder, sc, aBuilder, aResources);
+
+ return true;
+}
+
+nsDisplayText::nsDisplayText(nsDisplayListBuilder* aBuilder,
+ nsTextFrame* aFrame)
+ : nsPaintedDisplayItem(aBuilder, aFrame),
+ mVisIStartEdge(0),
+ mVisIEndEdge(0) {
+ MOZ_COUNT_CTOR(nsDisplayText);
+ mBounds = mFrame->InkOverflowRectRelativeToSelf() + ToReferenceFrame();
+ // Bug 748228
+ mBounds.Inflate(mFrame->PresContext()->AppUnitsPerDevPixel());
+ mVisibleRect = aBuilder->GetVisibleRect() +
+ aBuilder->GetCurrentFrameOffsetToReferenceFrame();
+}
+
+bool nsDisplayText::CanApplyOpacity(WebRenderLayerManager* aManager,
+ nsDisplayListBuilder* aBuilder) const {
+ auto* f = static_cast<nsTextFrame*>(mFrame);
+
+ if (f->IsSelected()) {
+ return false;
+ }
+
+ const nsStyleText* textStyle = f->StyleText();
+ if (textStyle->HasTextShadow()) {
+ return false;
+ }
+
+ nsTextFrame::TextDecorations decorations;
+ f->GetTextDecorations(f->PresContext(), nsTextFrame::eResolvedColors,
+ decorations);
+ return !decorations.HasDecorationLines();
+}
+
+void nsDisplayText::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+ AUTO_PROFILER_LABEL("nsDisplayText::Paint", GRAPHICS);
+ // We don't pass mVisibleRect here, since this can be called from within
+ // the WebRender fallback painting path, and we don't want to issue
+ // recorded commands that are dependent on the visible/building rect.
+ RenderToContext(aCtx, aBuilder, GetPaintRect(aBuilder, aCtx));
+}
+
+bool nsDisplayText::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ auto* f = static_cast<nsTextFrame*>(mFrame);
+ auto appUnitsPerDevPixel = f->PresContext()->AppUnitsPerDevPixel();
+
+ nsRect bounds = f->WebRenderBounds() + ToReferenceFrame();
+ // Bug 748228
+ bounds.Inflate(appUnitsPerDevPixel);
+
+ if (bounds.IsEmpty()) {
+ return true;
+ }
+
+ // For large font sizes, punt to a blob image, to avoid the blurry rendering
+ // that results from WR clamping the glyph size used for rasterization.
+ //
+ // (See FONT_SIZE_LIMIT in webrender/src/glyph_rasterizer/mod.rs.)
+ //
+ // This is not strictly accurate, as final used font sizes might not be the
+ // same as claimed by the fontGroup's style.size (eg: due to font-size-adjust
+ // altering the used size of the font actually used).
+ // It also fails to consider how transforms might affect the device-font-size
+ // that webrender uses (and clamps).
+ // But it should be near enough for practical purposes; the limitations just
+ // mean we might sometimes end up with webrender still applying some bitmap
+ // scaling, or bail out when we didn't really need to.
+ constexpr float kWebRenderFontSizeLimit = 320.0;
+ f->EnsureTextRun(nsTextFrame::eInflated);
+ gfxTextRun* textRun = f->GetTextRun(nsTextFrame::eInflated);
+ if (textRun &&
+ textRun->GetFontGroup()->GetStyle()->size > kWebRenderFontSizeLimit) {
+ return false;
+ }
+
+ gfx::Point deviceOffset =
+ LayoutDevicePoint::FromAppUnits(bounds.TopLeft(), appUnitsPerDevPixel)
+ .ToUnknownPoint();
+
+ // Clipping the bounds to the PaintRect (factoring in what's covered by parent
+ // frames) lets us early reject a bunch of things.
+ nsRect visible = mVisibleRect;
+
+ // Add the "source rect" area from which the given shadows could intersect
+ // with mVisibleRect, and which therefore needs to included in the paint
+ // operation, to the `visible` rect that we will use to limit the bounds of
+ // what we send to the renderer.
+ auto addShadowSourceToVisible = [&](Span<const StyleSimpleShadow> aShadows) {
+ for (const auto& shadow : aShadows) {
+ nsRect sourceRect = mVisibleRect;
+ // Negate the offsets, because we're looking for the "source" rect that
+ // could cast a shadow into the visible rect, rather than a "target" area
+ // onto which the visible rect would cast a shadow.
+ sourceRect.MoveBy(-shadow.horizontal.ToAppUnits(),
+ -shadow.vertical.ToAppUnits());
+ // Inflate to account for the shadow blur.
+ sourceRect.Inflate(nsContextBoxBlur::GetBlurRadiusMargin(
+ shadow.blur.ToAppUnits(), appUnitsPerDevPixel));
+ visible.OrWith(sourceRect);
+ }
+ };
+
+ // Shadows can translate things back into view, so we enlarge the notional
+ // "visible" rect to ensure we don't skip painting relevant parts that might
+ // cast a shadow within the visible area.
+ addShadowSourceToVisible(f->StyleText()->mTextShadow.AsSpan());
+
+ // Similarly for shadows that may be cast by ::selection.
+ if (f->IsSelected()) {
+ nsTextPaintStyle textPaint(f);
+ Span<const StyleSimpleShadow> shadows;
+ f->GetSelectionTextShadow(SelectionType::eNormal, textPaint, &shadows);
+ addShadowSourceToVisible(shadows);
+ }
+
+ // Inflate a little extra to allow for potential antialiasing "blur".
+ visible.Inflate(3 * appUnitsPerDevPixel);
+ bounds = bounds.Intersect(visible);
+
+ gfxContext* textDrawer = aBuilder.GetTextContext(aResources, aSc, aManager,
+ this, bounds, deviceOffset);
+
+ aBuilder.StartGroup(this);
+
+ RenderToContext(textDrawer, aDisplayListBuilder, mVisibleRect,
+ aBuilder.GetInheritedOpacity(), true);
+ const bool result = textDrawer->GetTextDrawer()->Finish();
+
+ if (result) {
+ aBuilder.FinishGroup();
+ } else {
+ aBuilder.CancelGroup(true);
+ }
+
+ return result;
+}
+
+void nsDisplayText::RenderToContext(gfxContext* aCtx,
+ nsDisplayListBuilder* aBuilder,
+ const nsRect& aVisibleRect, float aOpacity,
+ bool aIsRecording) {
+ nsTextFrame* f = static_cast<nsTextFrame*>(mFrame);
+
+ // Add 1 pixel of dirty area around mVisibleRect to allow us to paint
+ // antialiased pixels beyond the measured text extents.
+ // This is temporary until we do this in the actual calculation of text
+ // extents.
+ auto A2D = mFrame->PresContext()->AppUnitsPerDevPixel();
+ LayoutDeviceRect extraVisible =
+ LayoutDeviceRect::FromAppUnits(aVisibleRect, A2D);
+ extraVisible.Inflate(1);
+
+ gfxRect pixelVisible(extraVisible.x, extraVisible.y, extraVisible.width,
+ extraVisible.height);
+ pixelVisible.Inflate(2);
+ pixelVisible.RoundOut();
+
+ gfxClipAutoSaveRestore autoSaveClip(aCtx);
+ if (!aBuilder->IsForGenerateGlyphMask() && !aIsRecording) {
+ autoSaveClip.Clip(pixelVisible);
+ }
+
+ NS_ASSERTION(mVisIStartEdge >= 0, "illegal start edge");
+ NS_ASSERTION(mVisIEndEdge >= 0, "illegal end edge");
+
+ gfxContextMatrixAutoSaveRestore matrixSR;
+
+ nsPoint framePt = ToReferenceFrame();
+ if (f->Style()->IsTextCombined()) {
+ float scaleFactor = nsTextFrame::GetTextCombineScaleFactor(f);
+ if (scaleFactor != 1.0f) {
+ if (auto* textDrawer = aCtx->GetTextDrawer()) {
+ // WebRender doesn't support scaling text like this yet
+ textDrawer->FoundUnsupportedFeature();
+ return;
+ }
+ matrixSR.SetContext(aCtx);
+ // Setup matrix to compress text for text-combine-upright if
+ // necessary. This is done here because we want selection be
+ // compressed at the same time as text.
+ gfxPoint pt = nsLayoutUtils::PointToGfxPoint(framePt, A2D);
+ gfxMatrix mat = aCtx->CurrentMatrixDouble()
+ .PreTranslate(pt)
+ .PreScale(scaleFactor, 1.0)
+ .PreTranslate(-pt);
+ aCtx->SetMatrixDouble(mat);
+ }
+ }
+ nsTextFrame::PaintTextParams params(aCtx);
+ params.framePt = gfx::Point(framePt.x, framePt.y);
+ params.dirtyRect = extraVisible;
+
+ if (aBuilder->IsForGenerateGlyphMask()) {
+ params.state = nsTextFrame::PaintTextParams::GenerateTextMask;
+ } else {
+ params.state = nsTextFrame::PaintTextParams::PaintText;
+ }
+
+ f->PaintText(params, mVisIStartEdge, mVisIEndEdge, ToReferenceFrame(),
+ f->IsSelected(), aOpacity);
+}
+
+// This could go to nsDisplayListInvalidation.h, but
+// |nsTextFrame::TextDecorations| requires including of nsTextFrame.h which
+// would produce circular dependencies.
+class nsDisplayTextGeometry : public nsDisplayItemGenericGeometry {
+ public:
+ nsDisplayTextGeometry(nsDisplayText* aItem, nsDisplayListBuilder* aBuilder)
+ : nsDisplayItemGenericGeometry(aItem, aBuilder),
+ mVisIStartEdge(aItem->VisIStartEdge()),
+ mVisIEndEdge(aItem->VisIEndEdge()) {
+ nsTextFrame* f = static_cast<nsTextFrame*>(aItem->Frame());
+ f->GetTextDecorations(f->PresContext(), nsTextFrame::eResolvedColors,
+ mDecorations);
+ }
+
+ /**
+ * We store the computed text decorations here since they are
+ * computed using style data from parent frames. Any changes to these
+ * styles will only invalidate the parent frame and not this frame.
+ */
+ nsTextFrame::TextDecorations mDecorations;
+ nscoord mVisIStartEdge;
+ nscoord mVisIEndEdge;
+};
+
+nsDisplayItemGeometry* nsDisplayText::AllocateGeometry(
+ nsDisplayListBuilder* aBuilder) {
+ return new nsDisplayTextGeometry(this, aBuilder);
+}
+
+void nsDisplayText::ComputeInvalidationRegion(
+ nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
+ nsRegion* aInvalidRegion) const {
+ const nsDisplayTextGeometry* geometry =
+ static_cast<const nsDisplayTextGeometry*>(aGeometry);
+ nsTextFrame* f = static_cast<nsTextFrame*>(mFrame);
+
+ nsTextFrame::TextDecorations decorations;
+ f->GetTextDecorations(f->PresContext(), nsTextFrame::eResolvedColors,
+ decorations);
+
+ bool snap;
+ const nsRect& newRect = geometry->mBounds;
+ nsRect oldRect = GetBounds(aBuilder, &snap);
+ if (decorations != geometry->mDecorations ||
+ mVisIStartEdge != geometry->mVisIStartEdge ||
+ mVisIEndEdge != geometry->mVisIEndEdge ||
+ !oldRect.IsEqualInterior(newRect) ||
+ !geometry->mBorderRect.IsEqualInterior(GetBorderRect())) {
+ aInvalidRegion->Or(oldRect, newRect);
+ }
+}
+
+void nsDisplayText::WriteDebugInfo(std::stringstream& aStream) {
+#ifdef DEBUG
+ aStream << " (\"";
+
+ nsTextFrame* f = static_cast<nsTextFrame*>(mFrame);
+ nsCString buf;
+ f->ToCString(buf);
+
+ aStream << buf.get() << "\")";
+#endif
+}
+
+nsDisplayEffectsBase::nsDisplayEffectsBase(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot, bool aClearClipChain)
+ : nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot,
+ aClearClipChain) {
+ MOZ_COUNT_CTOR(nsDisplayEffectsBase);
+}
+
+nsDisplayEffectsBase::nsDisplayEffectsBase(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame,
+ nsDisplayList* aList)
+ : nsDisplayWrapList(aBuilder, aFrame, aList) {
+ MOZ_COUNT_CTOR(nsDisplayEffectsBase);
+}
+
+nsRegion nsDisplayEffectsBase::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ *aSnap = false;
+ return nsRegion();
+}
+
+void nsDisplayEffectsBase::HitTest(nsDisplayListBuilder* aBuilder,
+ const nsRect& aRect, HitTestState* aState,
+ nsTArray<nsIFrame*>* aOutFrames) {
+ nsPoint rectCenter(aRect.x + aRect.width / 2, aRect.y + aRect.height / 2);
+ if (SVGIntegrationUtils::HitTestFrameForEffects(
+ mFrame, rectCenter - ToReferenceFrame())) {
+ mList.HitTest(aBuilder, aRect, aState, aOutFrames);
+ }
+}
+
+gfxRect nsDisplayEffectsBase::BBoxInUserSpace() const {
+ return SVGUtils::GetBBox(mFrame);
+}
+
+gfxPoint nsDisplayEffectsBase::UserSpaceOffset() const {
+ return SVGUtils::FrameSpaceInCSSPxToUserSpaceOffset(mFrame);
+}
+
+void nsDisplayEffectsBase::ComputeInvalidationRegion(
+ nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
+ nsRegion* aInvalidRegion) const {
+ const auto* geometry =
+ static_cast<const nsDisplaySVGEffectGeometry*>(aGeometry);
+ bool snap;
+ nsRect bounds = GetBounds(aBuilder, &snap);
+ if (geometry->mFrameOffsetToReferenceFrame != ToReferenceFrame() ||
+ geometry->mUserSpaceOffset != UserSpaceOffset() ||
+ !geometry->mBBox.IsEqualInterior(BBoxInUserSpace())) {
+ // Filter and mask output can depend on the location of the frame's user
+ // space and on the frame's BBox. We need to invalidate if either of these
+ // change relative to the reference frame.
+ // Invalidations from our inactive layer manager are not enough to catch
+ // some of these cases because filters can produce output even if there's
+ // nothing in the filter input.
+ aInvalidRegion->Or(bounds, geometry->mBounds);
+ }
+}
+
+bool nsDisplayEffectsBase::ValidateSVGFrame() {
+ if (mFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
+ ISVGDisplayableFrame* svgFrame = do_QueryFrame(mFrame);
+ if (!svgFrame) {
+ return false;
+ }
+ if (auto* svgElement = SVGElement::FromNode(mFrame->GetContent())) {
+ // The SVG spec says only to draw filters if the element
+ // has valid dimensions.
+ return svgElement->HasValidDimensions();
+ }
+ return false;
+ }
+
+ return true;
+}
+
+using PaintFramesParams = SVGIntegrationUtils::PaintFramesParams;
+
+static void ComputeMaskGeometry(PaintFramesParams& aParams) {
+ // Properties are added lazily and may have been removed by a restyle, so
+ // make sure all applicable ones are set again.
+ nsIFrame* firstFrame =
+ nsLayoutUtils::FirstContinuationOrIBSplitSibling(aParams.frame);
+
+ const nsStyleSVGReset* svgReset = firstFrame->StyleSVGReset();
+
+ nsTArray<SVGMaskFrame*> maskFrames;
+ // XXX check return value?
+ SVGObserverUtils::GetAndObserveMasks(firstFrame, &maskFrames);
+
+ if (maskFrames.Length() == 0) {
+ return;
+ }
+
+ gfxContext& ctx = aParams.ctx;
+ nsIFrame* frame = aParams.frame;
+
+ nsPoint offsetToUserSpace =
+ nsLayoutUtils::ComputeOffsetToUserSpace(aParams.builder, aParams.frame);
+
+ auto cssToDevScale = frame->PresContext()->CSSToDevPixelScale();
+ int32_t appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
+
+ gfxPoint devPixelOffsetToUserSpace =
+ nsLayoutUtils::PointToGfxPoint(offsetToUserSpace, appUnitsPerDevPixel);
+
+ gfxContextMatrixAutoSaveRestore matSR(&ctx);
+ ctx.SetMatrixDouble(
+ ctx.CurrentMatrixDouble().PreTranslate(devPixelOffsetToUserSpace));
+
+ // Convert boaderArea and dirtyRect to user space.
+ nsRect userSpaceBorderArea = aParams.borderArea - offsetToUserSpace;
+ nsRect userSpaceDirtyRect = aParams.dirtyRect - offsetToUserSpace;
+
+ // Union all mask layer rectangles in user space.
+ LayoutDeviceRect maskInUserSpace;
+ for (size_t i = 0; i < maskFrames.Length(); i++) {
+ SVGMaskFrame* maskFrame = maskFrames[i];
+ LayoutDeviceRect currentMaskSurfaceRect;
+
+ if (maskFrame) {
+ auto rect = maskFrame->GetMaskArea(aParams.frame);
+ currentMaskSurfaceRect =
+ CSSRect::FromUnknownRect(ToRect(rect)) * cssToDevScale;
+ } else {
+ nsCSSRendering::ImageLayerClipState clipState;
+ nsCSSRendering::GetImageLayerClip(
+ svgReset->mMask.mLayers[i], frame, *frame->StyleBorder(),
+ userSpaceBorderArea, userSpaceDirtyRect,
+ /* aWillPaintBorder = */ false, appUnitsPerDevPixel, &clipState);
+ currentMaskSurfaceRect = LayoutDeviceRect::FromUnknownRect(
+ ToRect(clipState.mDirtyRectInDevPx));
+ }
+
+ maskInUserSpace = maskInUserSpace.Union(currentMaskSurfaceRect);
+ }
+
+ if (!maskInUserSpace.IsEmpty()) {
+ aParams.maskRect = Some(maskInUserSpace);
+ } else {
+ aParams.maskRect = Nothing();
+ }
+}
+
+nsDisplayMasksAndClipPaths::nsDisplayMasksAndClipPaths(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
+ const ActiveScrolledRoot* aActiveScrolledRoot, bool aWrapsBackdropFilter)
+ : nsDisplayEffectsBase(aBuilder, aFrame, aList, aActiveScrolledRoot, true),
+ mWrapsBackdropFilter(aWrapsBackdropFilter) {
+ MOZ_COUNT_CTOR(nsDisplayMasksAndClipPaths);
+
+ nsPresContext* presContext = mFrame->PresContext();
+ uint32_t flags =
+ aBuilder->GetBackgroundPaintFlags() | nsCSSRendering::PAINTBG_MASK_IMAGE;
+ const nsStyleSVGReset* svgReset = aFrame->StyleSVGReset();
+ NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, svgReset->mMask) {
+ const auto& layer = svgReset->mMask.mLayers[i];
+ if (!layer.mImage.IsResolved()) {
+ continue;
+ }
+ const nsRect& borderArea = mFrame->GetRectRelativeToSelf();
+ // NOTE(emilio): We only care about the dest rect so we don't bother
+ // computing a clip.
+ bool isTransformedFixed = false;
+ nsBackgroundLayerState state = nsCSSRendering::PrepareImageLayer(
+ presContext, aFrame, flags, borderArea, borderArea, layer,
+ &isTransformedFixed);
+ mDestRects.AppendElement(state.mDestArea);
+ }
+}
+
+static bool CanMergeDisplayMaskFrame(nsIFrame* aFrame) {
+ // Do not merge items for box-decoration-break:clone elements,
+ // since each box should have its own mask in that case.
+ if (aFrame->StyleBorder()->mBoxDecorationBreak ==
+ StyleBoxDecorationBreak::Clone) {
+ return false;
+ }
+
+ // Do not merge if either frame has a mask. Continuation frames should apply
+ // the mask independently (just like nsDisplayBackgroundImage).
+ if (aFrame->StyleSVGReset()->HasMask()) {
+ return false;
+ }
+
+ return true;
+}
+
+bool nsDisplayMasksAndClipPaths::CanMerge(const nsDisplayItem* aItem) const {
+ // Items for the same content element should be merged into a single
+ // compositing group.
+ if (!HasDifferentFrame(aItem) || !HasSameTypeAndClip(aItem) ||
+ !HasSameContent(aItem)) {
+ return false;
+ }
+
+ return CanMergeDisplayMaskFrame(mFrame) &&
+ CanMergeDisplayMaskFrame(aItem->Frame());
+}
+
+bool nsDisplayMasksAndClipPaths::IsValidMask() {
+ if (!ValidateSVGFrame()) {
+ return false;
+ }
+
+ nsIFrame* firstFrame =
+ nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame);
+
+ return !(SVGObserverUtils::GetAndObserveClipPath(firstFrame, nullptr) ==
+ SVGObserverUtils::eHasRefsSomeInvalid ||
+ SVGObserverUtils::GetAndObserveMasks(firstFrame, nullptr) ==
+ SVGObserverUtils::eHasRefsSomeInvalid);
+}
+
+bool nsDisplayMasksAndClipPaths::PaintMask(nsDisplayListBuilder* aBuilder,
+ gfxContext* aMaskContext,
+ bool aHandleOpacity,
+ bool* aMaskPainted) {
+ MOZ_ASSERT(aMaskContext->GetDrawTarget()->GetFormat() == SurfaceFormat::A8);
+
+ imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
+ nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
+ PaintFramesParams params(*aMaskContext, mFrame, mBounds, borderArea, aBuilder,
+ aHandleOpacity, imgParams);
+ ComputeMaskGeometry(params);
+ bool maskIsComplete = false;
+ bool painted = SVGIntegrationUtils::PaintMask(params, maskIsComplete);
+ if (aMaskPainted) {
+ *aMaskPainted = painted;
+ }
+
+ return maskIsComplete &&
+ (imgParams.result == ImgDrawResult::SUCCESS ||
+ imgParams.result == ImgDrawResult::SUCCESS_NOT_COMPLETE ||
+ imgParams.result == ImgDrawResult::WRONG_SIZE);
+}
+
+void nsDisplayMasksAndClipPaths::ComputeInvalidationRegion(
+ nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
+ nsRegion* aInvalidRegion) const {
+ nsDisplayEffectsBase::ComputeInvalidationRegion(aBuilder, aGeometry,
+ aInvalidRegion);
+
+ const auto* geometry =
+ static_cast<const nsDisplayMasksAndClipPathsGeometry*>(aGeometry);
+ bool snap;
+ nsRect bounds = GetBounds(aBuilder, &snap);
+
+ if (mDestRects.Length() != geometry->mDestRects.Length()) {
+ aInvalidRegion->Or(bounds, geometry->mBounds);
+ } else {
+ for (size_t i = 0; i < mDestRects.Length(); i++) {
+ if (!mDestRects[i].IsEqualInterior(geometry->mDestRects[i])) {
+ aInvalidRegion->Or(bounds, geometry->mBounds);
+ break;
+ }
+ }
+ }
+}
+
+void nsDisplayMasksAndClipPaths::PaintWithContentsPaintCallback(
+ nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
+ const std::function<void()>& aPaintChildren) {
+ // Clip the drawing target by mVisibleRect, which contains the visible
+ // region of the target frame and its out-of-flow and inflow descendants.
+ Rect bounds = NSRectToRect(GetPaintRect(aBuilder, aCtx),
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+ bounds.RoundOut();
+ gfxClipAutoSaveRestore autoSaveClip(aCtx);
+ autoSaveClip.Clip(bounds);
+
+ imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
+ nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
+ PaintFramesParams params(*aCtx, mFrame, GetPaintRect(aBuilder, aCtx),
+ borderArea, aBuilder, false, imgParams);
+
+ ComputeMaskGeometry(params);
+
+ SVGIntegrationUtils::PaintMaskAndClipPath(params, aPaintChildren);
+}
+
+void nsDisplayMasksAndClipPaths::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ if (!IsValidMask()) {
+ return;
+ }
+ PaintWithContentsPaintCallback(aBuilder, aCtx, [&] {
+ GetChildren()->Paint(aBuilder, aCtx,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+ });
+}
+
+static Maybe<wr::WrClipChainId> CreateSimpleClipRegion(
+ const nsDisplayMasksAndClipPaths& aDisplayItem,
+ wr::DisplayListBuilder& aBuilder) {
+ nsIFrame* frame = aDisplayItem.Frame();
+ const auto* style = frame->StyleSVGReset();
+ MOZ_ASSERT(style->HasClipPath() || style->HasMask());
+ if (!SVGIntegrationUtils::UsingSimpleClipPathForFrame(frame)) {
+ return Nothing();
+ }
+
+ const auto& clipPath = style->mClipPath;
+ const auto& shape = *clipPath.AsShape()._0;
+
+ auto appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
+ const nsRect refBox =
+ nsLayoutUtils::ComputeGeometryBox(frame, clipPath.AsShape()._1);
+
+ wr::WrClipId clipId{};
+
+ switch (shape.tag) {
+ case StyleBasicShape::Tag::Inset: {
+ const nsRect insetRect = ShapeUtils::ComputeInsetRect(shape, refBox) +
+ aDisplayItem.ToReferenceFrame();
+
+ nscoord radii[8] = {0};
+
+ if (ShapeUtils::ComputeInsetRadii(shape, refBox, insetRect, radii)) {
+ clipId = aBuilder.DefineRoundedRectClip(
+ Nothing(),
+ wr::ToComplexClipRegion(insetRect, radii, appUnitsPerDevPixel));
+ } else {
+ clipId = aBuilder.DefineRectClip(
+ Nothing(), wr::ToLayoutRect(LayoutDeviceRect::FromAppUnits(
+ insetRect, appUnitsPerDevPixel)));
+ }
+
+ break;
+ }
+ case StyleBasicShape::Tag::Ellipse:
+ case StyleBasicShape::Tag::Circle: {
+ nsPoint center = ShapeUtils::ComputeCircleOrEllipseCenter(shape, refBox);
+
+ nsSize radii;
+ if (shape.IsEllipse()) {
+ radii = ShapeUtils::ComputeEllipseRadii(shape, center, refBox);
+ } else {
+ nscoord radius = ShapeUtils::ComputeCircleRadius(shape, center, refBox);
+ radii = {radius, radius};
+ }
+
+ nsRect ellipseRect(aDisplayItem.ToReferenceFrame() + center -
+ nsPoint(radii.width, radii.height),
+ radii * 2);
+
+ nscoord ellipseRadii[8];
+ for (const auto corner : AllPhysicalHalfCorners()) {
+ ellipseRadii[corner] =
+ HalfCornerIsX(corner) ? radii.width : radii.height;
+ }
+
+ clipId = aBuilder.DefineRoundedRectClip(
+ Nothing(), wr::ToComplexClipRegion(ellipseRect, ellipseRadii,
+ appUnitsPerDevPixel));
+
+ break;
+ }
+ default:
+ // Please don't add more exceptions, try to find a way to define the clip
+ // without using a mask image.
+ //
+ // And if you _really really_ need to add an exception, add it to
+ // SVGIntegrationUtils::UsingSimpleClipPathForFrame
+ MOZ_ASSERT_UNREACHABLE("Unhandled shape id?");
+ return Nothing();
+ }
+
+ wr::WrClipChainId clipChainId = aBuilder.DefineClipChain({clipId}, true);
+
+ return Some(clipChainId);
+}
+
+static void FillPolygonDataForDisplayItem(
+ const nsDisplayMasksAndClipPaths& aDisplayItem,
+ nsTArray<wr::LayoutPoint>& aPoints, wr::FillRule& aFillRule) {
+ nsIFrame* frame = aDisplayItem.Frame();
+ const auto* style = frame->StyleSVGReset();
+ bool isPolygon = style->HasClipPath() && style->mClipPath.IsShape() &&
+ style->mClipPath.AsShape()._0->IsPolygon();
+ if (!isPolygon) {
+ return;
+ }
+
+ const auto& clipPath = style->mClipPath;
+ const auto& shape = *clipPath.AsShape()._0;
+ const nsRect refBox =
+ nsLayoutUtils::ComputeGeometryBox(frame, clipPath.AsShape()._1);
+
+ // We only fill polygon data for polygons that are below a complexity
+ // limit.
+ nsTArray<nsPoint> vertices =
+ ShapeUtils::ComputePolygonVertices(shape, refBox);
+ if (vertices.Length() > wr::POLYGON_CLIP_VERTEX_MAX) {
+ return;
+ }
+
+ auto appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
+
+ for (size_t i = 0; i < vertices.Length(); ++i) {
+ wr::LayoutPoint point = wr::ToLayoutPoint(
+ LayoutDevicePoint::FromAppUnits(vertices[i], appUnitsPerDevPixel));
+ aPoints.AppendElement(point);
+ }
+
+ aFillRule = (shape.AsPolygon().fill == StyleFillRule::Nonzero)
+ ? wr::FillRule::Nonzero
+ : wr::FillRule::Evenodd;
+}
+
+static Maybe<wr::WrClipChainId> CreateWRClipPathAndMasks(
+ nsDisplayMasksAndClipPaths* aDisplayItem, const LayoutDeviceRect& aBounds,
+ wr::IpcResourceUpdateQueue& aResources, wr::DisplayListBuilder& aBuilder,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ if (auto clip = CreateSimpleClipRegion(*aDisplayItem, aBuilder)) {
+ return clip;
+ }
+
+ Maybe<wr::ImageMask> mask = aManager->CommandBuilder().BuildWrMaskImage(
+ aDisplayItem, aBuilder, aResources, aSc, aDisplayListBuilder, aBounds);
+ if (!mask) {
+ return Nothing();
+ }
+
+ // We couldn't create a simple clip region, but before we create an image
+ // mask clip, see if we can get a polygon clip to add to it.
+ nsTArray<wr::LayoutPoint> points;
+ wr::FillRule fillRule = wr::FillRule::Nonzero;
+ FillPolygonDataForDisplayItem(*aDisplayItem, points, fillRule);
+
+ wr::WrClipId clipId =
+ aBuilder.DefineImageMaskClip(mask.ref(), points, fillRule);
+
+ wr::WrClipChainId clipChainId = aBuilder.DefineClipChain({clipId}, true);
+
+ return Some(clipChainId);
+}
+
+bool nsDisplayMasksAndClipPaths::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ bool snap;
+ auto appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+ nsRect displayBounds = GetBounds(aDisplayListBuilder, &snap);
+ LayoutDeviceRect bounds =
+ LayoutDeviceRect::FromAppUnits(displayBounds, appUnitsPerDevPixel);
+
+ Maybe<wr::WrClipChainId> clip = CreateWRClipPathAndMasks(
+ this, bounds, aResources, aBuilder, aSc, aManager, aDisplayListBuilder);
+
+ float oldOpacity = aBuilder.GetInheritedOpacity();
+
+ Maybe<StackingContextHelper> layer;
+ const StackingContextHelper* sc = &aSc;
+ if (clip) {
+ // Create a new stacking context to attach the mask to, ensuring the mask is
+ // applied to the aggregate, and not the individual elements.
+
+ // The stacking context shouldn't have any offset.
+ bounds.MoveTo(0, 0);
+
+ Maybe<float> opacity =
+ (SVGIntegrationUtils::UsingSimpleClipPathForFrame(mFrame) &&
+ aBuilder.GetInheritedOpacity() != 1.0f)
+ ? Some(aBuilder.GetInheritedOpacity())
+ : Nothing();
+
+ wr::StackingContextParams params;
+ params.clip = wr::WrStackingContextClip::ClipChain(clip->id);
+ params.opacity = opacity.ptrOr(nullptr);
+ if (mWrapsBackdropFilter) {
+ params.flags |= wr::StackingContextFlags::WRAPS_BACKDROP_FILTER;
+ }
+ layer.emplace(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder, params,
+ bounds);
+ sc = layer.ptr();
+ }
+
+ aBuilder.SetInheritedOpacity(1.0f);
+ const DisplayItemClipChain* oldClipChain = aBuilder.GetInheritedClipChain();
+ aBuilder.SetInheritedClipChain(nullptr);
+ CreateWebRenderCommandsNewClipListOption(aBuilder, aResources, *sc, aManager,
+ aDisplayListBuilder, layer.isSome());
+ aBuilder.SetInheritedOpacity(oldOpacity);
+ aBuilder.SetInheritedClipChain(oldClipChain);
+
+ return true;
+}
+
+Maybe<nsRect> nsDisplayMasksAndClipPaths::GetClipWithRespectToASR(
+ nsDisplayListBuilder* aBuilder, const ActiveScrolledRoot* aASR) const {
+ if (const DisplayItemClip* clip =
+ DisplayItemClipChain::ClipForASR(GetClipChain(), aASR)) {
+ return Some(clip->GetClipRect());
+ }
+ // This item does not have a clip with respect to |aASR|. However, we
+ // might still have finite bounds with respect to |aASR|. Check our
+ // children.
+ nsDisplayList* childList = GetSameCoordinateSystemChildren();
+ if (childList) {
+ return Some(childList->GetClippedBoundsWithRespectToASR(aBuilder, aASR));
+ }
+#ifdef DEBUG
+ NS_ASSERTION(false, "item should have finite clip with respect to aASR");
+#endif
+ return Nothing();
+}
+
+#ifdef MOZ_DUMP_PAINTING
+void nsDisplayMasksAndClipPaths::PrintEffects(nsACString& aTo) {
+ nsIFrame* firstFrame =
+ nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame);
+ bool first = true;
+ aTo += " effects=(";
+ SVGClipPathFrame* clipPathFrame;
+ // XXX Check return value?
+ SVGObserverUtils::GetAndObserveClipPath(firstFrame, &clipPathFrame);
+ if (clipPathFrame) {
+ if (!first) {
+ aTo += ", ";
+ }
+ aTo += nsPrintfCString(
+ "clip(%s)", clipPathFrame->IsTrivial() ? "trivial" : "non-trivial");
+ first = false;
+ } else if (mFrame->StyleSVGReset()->HasClipPath()) {
+ if (!first) {
+ aTo += ", ";
+ }
+ aTo += "clip(basic-shape)";
+ first = false;
+ }
+
+ nsTArray<SVGMaskFrame*> masks;
+ // XXX check return value?
+ SVGObserverUtils::GetAndObserveMasks(firstFrame, &masks);
+ if (!masks.IsEmpty() && masks[0]) {
+ if (!first) {
+ aTo += ", ";
+ }
+ aTo += "mask";
+ }
+ aTo += ")";
+}
+#endif
+
+bool nsDisplayBackdropFilters::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ WrFiltersHolder wrFilters;
+ const ComputedStyle& style = mStyle ? *mStyle : *mFrame->Style();
+ auto filterChain = style.StyleEffects()->mBackdropFilters.AsSpan();
+ bool initialized = true;
+ if (!SVGIntegrationUtils::CreateWebRenderCSSFilters(filterChain, mFrame,
+ wrFilters) &&
+ !SVGIntegrationUtils::BuildWebRenderFilters(mFrame, filterChain,
+ wrFilters, initialized)) {
+ // TODO: If painting backdrop-filters on the content side is implemented,
+ // consider returning false to fall back to that.
+ wrFilters = {};
+ }
+
+ if (!initialized) {
+ wrFilters = {};
+ }
+
+ nsCSSRendering::ImageLayerClipState clip;
+ nsCSSRendering::GetImageLayerClip(
+ style.StyleBackground()->BottomLayer(), mFrame, *style.StyleBorder(),
+ mBackdropRect, mBackdropRect, false,
+ mFrame->PresContext()->AppUnitsPerDevPixel(), &clip);
+
+ LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
+ mBackdropRect, mFrame->PresContext()->AppUnitsPerDevPixel());
+
+ wr::ComplexClipRegion region =
+ wr::ToComplexClipRegion(clip.mBGClipArea, clip.mRadii,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+
+ aBuilder.PushBackdropFilter(wr::ToLayoutRect(bounds), region,
+ wrFilters.filters, wrFilters.filter_datas,
+ !BackfaceIsHidden());
+
+ wr::StackingContextParams params;
+ params.clip =
+ wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
+ params);
+
+ nsDisplayWrapList::CreateWebRenderCommands(aBuilder, aResources, sc, aManager,
+ aDisplayListBuilder);
+ return true;
+}
+
+void nsDisplayBackdropFilters::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ // TODO: Implement backdrop filters
+ GetChildren()->Paint(aBuilder, aCtx,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+}
+
+nsRect nsDisplayBackdropFilters::GetBounds(nsDisplayListBuilder* aBuilder,
+ bool* aSnap) const {
+ nsRect childBounds = nsDisplayWrapList::GetBounds(aBuilder, aSnap);
+
+ *aSnap = false;
+
+ return mBackdropRect.Union(childBounds);
+}
+
+/* static */
+nsDisplayFilters::nsDisplayFilters(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, nsDisplayList* aList,
+ nsIFrame* aStyleFrame,
+ bool aWrapsBackdropFilter)
+ : nsDisplayEffectsBase(aBuilder, aFrame, aList),
+ mStyle(aFrame == aStyleFrame ? nullptr : aStyleFrame->Style()),
+ mEffectsBounds(aFrame->InkOverflowRectRelativeToSelf()),
+ mWrapsBackdropFilter(aWrapsBackdropFilter) {
+ MOZ_COUNT_CTOR(nsDisplayFilters);
+ mVisibleRect = aBuilder->GetVisibleRect() +
+ aBuilder->GetCurrentFrameOffsetToReferenceFrame();
+}
+
+void nsDisplayFilters::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+ PaintWithContentsPaintCallback(aBuilder, aCtx, [&](gfxContext* aContext) {
+ GetChildren()->Paint(aBuilder, aContext,
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+ });
+}
+
+void nsDisplayFilters::PaintWithContentsPaintCallback(
+ nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
+ const std::function<void(gfxContext* aContext)>& aPaintChildren) {
+ imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
+ nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
+ PaintFramesParams params(*aCtx, mFrame, mVisibleRect, borderArea, aBuilder,
+ false, imgParams);
+
+ gfxPoint userSpaceToFrameSpaceOffset =
+ SVGIntegrationUtils::GetOffsetToUserSpaceInDevPx(mFrame, params);
+
+ auto filterChain = mStyle ? mStyle->StyleEffects()->mFilters.AsSpan()
+ : mFrame->StyleEffects()->mFilters.AsSpan();
+ SVGIntegrationUtils::PaintFilter(
+ params, filterChain,
+ [&](gfxContext& aContext, imgDrawingParams&, const gfxMatrix*,
+ const nsIntRect*) {
+ gfxContextMatrixAutoSaveRestore autoSR(&aContext);
+ aContext.SetMatrixDouble(aContext.CurrentMatrixDouble().PreTranslate(
+ -userSpaceToFrameSpaceOffset));
+ aPaintChildren(&aContext);
+ });
+}
+
+bool nsDisplayFilters::CanCreateWebRenderCommands() const {
+ return SVGIntegrationUtils::CanCreateWebRenderFiltersForFrame(mFrame);
+}
+
+bool nsDisplayFilters::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ WrFiltersHolder wrFilters;
+ const ComputedStyle& style = mStyle ? *mStyle : *mFrame->Style();
+ auto filterChain = style.StyleEffects()->mFilters.AsSpan();
+ bool initialized = true;
+ if (!SVGIntegrationUtils::CreateWebRenderCSSFilters(filterChain, mFrame,
+ wrFilters) &&
+ !SVGIntegrationUtils::BuildWebRenderFilters(mFrame, filterChain,
+ wrFilters, initialized)) {
+ if (mStyle) {
+ // TODO(bug 1769223): Support fallback filters in the root code-path,
+ // perhaps. For now treat it the same way as invalid filters.
+ wrFilters = {};
+ } else {
+ // Draw using fallback.
+ return false;
+ }
+ }
+
+ if (!initialized) {
+ // https://drafts.fxtf.org/filter-effects/#typedef-filter-url:
+ //
+ // If the filter references a non-existent object or the referenced object
+ // is not a filter element, then the whole filter chain is ignored. No
+ // filter is applied to the object.
+ //
+ // Note that other engines have a weird discrepancy between SVG and HTML
+ // content here, but the spec is clear.
+ wrFilters = {};
+ }
+
+ uint64_t clipChainId;
+ if (wrFilters.post_filters_clip) {
+ auto devPxRect = LayoutDeviceRect::FromAppUnits(
+ wrFilters.post_filters_clip.value() + ToReferenceFrame(),
+ mFrame->PresContext()->AppUnitsPerDevPixel());
+ auto clipId =
+ aBuilder.DefineRectClip(Nothing(), wr::ToLayoutRect(devPxRect));
+ clipChainId = aBuilder.DefineClipChain({clipId}, true).id;
+ } else {
+ clipChainId = aBuilder.CurrentClipChainId();
+ }
+ wr::WrStackingContextClip clip =
+ wr::WrStackingContextClip::ClipChain(clipChainId);
+
+ float opacity = aBuilder.GetInheritedOpacity();
+ aBuilder.SetInheritedOpacity(1.0f);
+ const DisplayItemClipChain* oldClipChain = aBuilder.GetInheritedClipChain();
+ aBuilder.SetInheritedClipChain(nullptr);
+ wr::StackingContextParams params;
+ params.mFilters = std::move(wrFilters.filters);
+ params.mFilterDatas = std::move(wrFilters.filter_datas);
+ params.opacity = opacity != 1.0f ? &opacity : nullptr;
+ params.clip = clip;
+ if (mWrapsBackdropFilter) {
+ params.flags |= wr::StackingContextFlags::WRAPS_BACKDROP_FILTER;
+ }
+ StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
+ params);
+
+ nsDisplayEffectsBase::CreateWebRenderCommands(aBuilder, aResources, sc,
+ aManager, aDisplayListBuilder);
+ aBuilder.SetInheritedOpacity(opacity);
+ aBuilder.SetInheritedClipChain(oldClipChain);
+
+ return true;
+}
+
+#ifdef MOZ_DUMP_PAINTING
+void nsDisplayFilters::PrintEffects(nsACString& aTo) {
+ nsIFrame* firstFrame =
+ nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame);
+ bool first = true;
+ aTo += " effects=(";
+ // We may exist for a mix of CSS filter functions and/or references to SVG
+ // filters. If we have invalid references to SVG filters then we paint
+ // nothing, but otherwise we will apply one or more filters.
+ if (SVGObserverUtils::GetAndObserveFilters(firstFrame, nullptr) !=
+ SVGObserverUtils::eHasRefsSomeInvalid) {
+ if (!first) {
+ aTo += ", ";
+ }
+ aTo += "filter";
+ }
+ aTo += ")";
+}
+#endif
+
+nsDisplaySVGWrapper::nsDisplaySVGWrapper(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame, nsDisplayList* aList)
+ : nsDisplayWrapList(aBuilder, aFrame, aList) {
+ MOZ_COUNT_CTOR(nsDisplaySVGWrapper);
+}
+
+bool nsDisplaySVGWrapper::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) {
+ return !aBuilder->GetWidgetLayerManager();
+}
+
+bool nsDisplaySVGWrapper::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ return CreateWebRenderCommandsNewClipListOption(
+ aBuilder, aResources, aSc, aManager, aDisplayListBuilder, false);
+}
+
+nsDisplayForeignObject::nsDisplayForeignObject(nsDisplayListBuilder* aBuilder,
+ nsIFrame* aFrame,
+ nsDisplayList* aList)
+ : nsDisplayWrapList(aBuilder, aFrame, aList) {
+ MOZ_COUNT_CTOR(nsDisplayForeignObject);
+}
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+nsDisplayForeignObject::~nsDisplayForeignObject() {
+ MOZ_COUNT_DTOR(nsDisplayForeignObject);
+}
+#endif
+
+bool nsDisplayForeignObject::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) {
+ return !aBuilder->GetWidgetLayerManager();
+}
+
+bool nsDisplayForeignObject::CreateWebRenderCommands(
+ wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
+ const StackingContextHelper& aSc, RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ AutoRestore<bool> restoreDoGrouping(aManager->CommandBuilder().mDoGrouping);
+ aManager->CommandBuilder().mDoGrouping = false;
+ return CreateWebRenderCommandsNewClipListOption(
+ aBuilder, aResources, aSc, aManager, aDisplayListBuilder, false);
+}
+
+void nsDisplayLink::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+ auto appPerDev = mFrame->PresContext()->AppUnitsPerDevPixel();
+ aCtx->GetDrawTarget()->Link(
+ mLinkSpec.get(), NSRectToRect(GetPaintRect(aBuilder, aCtx), appPerDev));
+}
+
+void nsDisplayDestination::Paint(nsDisplayListBuilder* aBuilder,
+ gfxContext* aCtx) {
+ auto appPerDev = mFrame->PresContext()->AppUnitsPerDevPixel();
+ aCtx->GetDrawTarget()->Destination(
+ mDestinationName.get(),
+ NSPointToPoint(GetPaintRect(aBuilder, aCtx).TopLeft(), appPerDev));
+}
+
+void nsDisplayListCollection::SerializeWithCorrectZOrder(
+ nsDisplayList* aOutResultList, nsIContent* aContent) {
+ // Sort PositionedDescendants() in CSS 'z-order' order. The list is already
+ // in content document order and SortByZOrder is a stable sort which
+ // guarantees that boxes produced by the same element are placed together
+ // in the sort. Consider a position:relative inline element that breaks
+ // across lines and has absolutely positioned children; all the abs-pos
+ // children should be z-ordered after all the boxes for the position:relative
+ // element itself.
+ PositionedDescendants()->SortByZOrder();
+
+ // Now follow the rules of http://www.w3.org/TR/CSS21/zindex.html
+ // 1,2: backgrounds and borders
+ aOutResultList->AppendToTop(BorderBackground());
+ // 3: negative z-index children.
+ for (auto* item : PositionedDescendants()->TakeItems()) {
+ if (item->ZIndex() < 0) {
+ aOutResultList->AppendToTop(item);
+ } else {
+ PositionedDescendants()->AppendToTop(item);
+ }
+ }
+
+ // 4: block backgrounds
+ aOutResultList->AppendToTop(BlockBorderBackgrounds());
+ // 5: floats
+ aOutResultList->AppendToTop(Floats());
+ // 7: general content
+ aOutResultList->AppendToTop(Content());
+ // 7.5: outlines, in content tree order. We need to sort by content order
+ // because an element with outline that breaks and has children with outline
+ // might have placed child outline items between its own outline items.
+ // The element's outline items need to all come before any child outline
+ // items.
+ if (aContent) {
+ Outlines()->SortByContentOrder(aContent);
+ }
+ aOutResultList->AppendToTop(Outlines());
+ // 8, 9: non-negative z-index children
+ aOutResultList->AppendToTop(PositionedDescendants());
+}
+
+uint32_t PaintTelemetry::sPaintLevel = 0;
+
+PaintTelemetry::AutoRecordPaint::AutoRecordPaint() {
+ // Don't record nested paints.
+ if (sPaintLevel++ > 0) {
+ return;
+ }
+
+ mStart = TimeStamp::Now();
+}
+
+PaintTelemetry::AutoRecordPaint::~AutoRecordPaint() {
+ MOZ_ASSERT(sPaintLevel != 0);
+ if (--sPaintLevel > 0) {
+ return;
+ }
+
+ // If we're in multi-process mode, don't include paint times for the parent
+ // process.
+ if (gfxVars::BrowserTabsRemoteAutostart() && XRE_IsParentProcess()) {
+ return;
+ }
+
+ double totalMs = (TimeStamp::Now() - mStart).ToMilliseconds();
+
+ // Record the total time.
+ Telemetry::Accumulate(Telemetry::CONTENT_PAINT_TIME,
+ static_cast<uint32_t>(totalMs));
+}
+
+static nsIFrame* GetSelfOrPlaceholderFor(nsIFrame* aFrame) {
+ if (aFrame->HasAnyStateBits(NS_FRAME_IS_PUSHED_FLOAT)) {
+ return aFrame;
+ }
+
+ if (aFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) &&
+ !aFrame->GetPrevInFlow()) {
+ return aFrame->GetPlaceholderFrame();
+ }
+
+ return aFrame;
+}
+
+static nsIFrame* GetAncestorFor(nsIFrame* aFrame) {
+ nsIFrame* f = GetSelfOrPlaceholderFor(aFrame);
+ MOZ_ASSERT(f);
+ return nsLayoutUtils::GetCrossDocParentFrameInProcess(f);
+}
+
+nsDisplayListBuilder::AutoBuildingDisplayList::AutoBuildingDisplayList(
+ nsDisplayListBuilder* aBuilder, nsIFrame* aForChild,
+ const nsRect& aVisibleRect, const nsRect& aDirtyRect,
+ const bool aIsTransformed)
+ : mBuilder(aBuilder),
+ mPrevFrame(aBuilder->mCurrentFrame),
+ mPrevReferenceFrame(aBuilder->mCurrentReferenceFrame),
+ mPrevOffset(aBuilder->mCurrentOffsetToReferenceFrame),
+ mPrevAdditionalOffset(aBuilder->mAdditionalOffset),
+ mPrevVisibleRect(aBuilder->mVisibleRect),
+ mPrevDirtyRect(aBuilder->mDirtyRect),
+ mPrevCompositorHitTestInfo(aBuilder->mCompositorHitTestInfo),
+ mPrevAncestorHasApzAwareEventHandler(
+ aBuilder->mAncestorHasApzAwareEventHandler),
+ mPrevBuildingInvisibleItems(aBuilder->mBuildingInvisibleItems),
+ mPrevInInvalidSubtree(aBuilder->mInInvalidSubtree) {
+ if (aIsTransformed) {
+ aBuilder->mCurrentOffsetToReferenceFrame =
+ aBuilder->AdditionalOffset().refOr(nsPoint());
+ aBuilder->mCurrentReferenceFrame = aForChild;
+ } else if (aBuilder->mCurrentFrame == aForChild->GetParent()) {
+ aBuilder->mCurrentOffsetToReferenceFrame += aForChild->GetPosition();
+ } else {
+ aBuilder->mCurrentReferenceFrame = aBuilder->FindReferenceFrameFor(
+ aForChild, &aBuilder->mCurrentOffsetToReferenceFrame);
+ }
+
+ // If aForChild is being visited from a frame other than it's ancestor frame,
+ // mInInvalidSubtree will need to be recalculated the slow way.
+ if (aForChild == mPrevFrame || GetAncestorFor(aForChild) == mPrevFrame) {
+ aBuilder->mInInvalidSubtree =
+ aBuilder->mInInvalidSubtree || aForChild->IsFrameModified();
+ } else {
+ aBuilder->mInInvalidSubtree = AnyContentAncestorModified(aForChild);
+ }
+
+ aBuilder->mCurrentFrame = aForChild;
+ aBuilder->mVisibleRect = aVisibleRect;
+ aBuilder->mDirtyRect =
+ aBuilder->mInInvalidSubtree ? aVisibleRect : aDirtyRect;
+}
+
+} // namespace mozilla
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 04:10:48 +0000