diff options
Diffstat (limited to 'layout/svg/SVGOuterSVGFrame.cpp')
| -rw-r--r-- | layout/svg/SVGOuterSVGFrame.cpp | 874 |
1 files changed, 874 insertions, 0 deletions
diff --git a/layout/svg/SVGOuterSVGFrame.cpp b/layout/svg/SVGOuterSVGFrame.cpp new file mode 100644 index 0000000000..ea0879c0c2 --- /dev/null +++ b/layout/svg/SVGOuterSVGFrame.cpp @@ -0,0 +1,874 @@ +/* -*- 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/. */ + +// Main header first: +#include "SVGOuterSVGFrame.h" + +// Keep others in (case-insensitive) order: +#include "gfxContext.h" +#include "nsDisplayList.h" +#include "nsIInterfaceRequestorUtils.h" +#include "nsLayoutUtils.h" +#include "nsObjectLoadingContent.h" +#include "nsSubDocumentFrame.h" +#include "mozilla/PresShell.h" +#include "mozilla/SVGUtils.h" +#include "mozilla/dom/BrowserChild.h" +#include "mozilla/dom/Document.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/SVGSVGElement.h" + +using namespace mozilla::dom; +using namespace mozilla::gfx; +using namespace mozilla::image; + +//---------------------------------------------------------------------- +// Implementation + +nsContainerFrame* NS_NewSVGOuterSVGFrame(mozilla::PresShell* aPresShell, + mozilla::ComputedStyle* aStyle) { + return new (aPresShell) + mozilla::SVGOuterSVGFrame(aStyle, aPresShell->GetPresContext()); +} + +namespace mozilla { + +NS_IMPL_FRAMEARENA_HELPERS(SVGOuterSVGFrame) + +SVGOuterSVGFrame::SVGOuterSVGFrame(ComputedStyle* aStyle, + nsPresContext* aPresContext) + : SVGDisplayContainerFrame(aStyle, aPresContext, kClassID) { + // Outer-<svg> has CSS layout, so remove this bit: + RemoveStateBits(NS_FRAME_SVG_LAYOUT); + AddStateBits(NS_FRAME_REFLOW_ROOT | NS_FRAME_FONT_INFLATION_CONTAINER | + NS_FRAME_FONT_INFLATION_FLOW_ROOT | NS_FRAME_MAY_BE_TRANSFORMED); +} + +// The CSS Containment spec says that size-contained replaced elements must be +// treated as having an intrinsic width and height of 0. That's applicable to +// outer SVG frames, unless they're the outermost element (in which case +// they're not really "replaced", and there's no outer context to contain sizes +// from leaking into). Hence, we check for a parent element before we bother +// testing for 'contain:size'. +static inline ContainSizeAxes ContainSizeAxesIfApplicable( + const SVGOuterSVGFrame* aFrame) { + if (!aFrame->GetContent()->GetParent()) { + return ContainSizeAxes(false, false); + } + return aFrame->GetContainSizeAxes(); +} + +// This should match ImageDocument::GetZoomLevel. +float SVGOuterSVGFrame::ComputeFullZoom() const { + MOZ_ASSERT(mIsRootContent); + MOZ_ASSERT(!mIsInIframe); + if (BrowsingContext* bc = PresContext()->Document()->GetBrowsingContext()) { + return bc->FullZoom(); + } + return 1.0f; +} + +void SVGOuterSVGFrame::Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) { + NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::svg), + "Content is not an SVG 'svg' element!"); + + // Check for conditional processing attributes here rather than in + // nsCSSFrameConstructor::FindSVGData because we want to avoid + // simply giving failing outer <svg> elements an SVGContainerFrame. + // We don't create other SVG frames if PassesConditionalProcessingTests + // returns false, but since we do create SVGOuterSVGFrame frames we + // prevent them from painting by [ab]use NS_FRAME_IS_NONDISPLAY. The + // frame will be recreated via an nsChangeHint_ReconstructFrame restyle if + // the value returned by PassesConditionalProcessingTests changes. + auto* svg = static_cast<SVGSVGElement*>(aContent); + if (!svg->PassesConditionalProcessingTests()) { + AddStateBits(NS_FRAME_IS_NONDISPLAY); + } + + SVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow); + + Document* doc = mContent->GetUncomposedDoc(); + mIsRootContent = doc && doc->GetRootElement() == mContent; + + if (mIsRootContent) { + if (nsCOMPtr<nsIDocShell> docShell = PresContext()->GetDocShell()) { + RefPtr<BrowsingContext> bc = docShell->GetBrowsingContext(); + if (const Maybe<nsString>& type = bc->GetEmbedderElementType()) { + mIsInObjectOrEmbed = + nsGkAtoms::object->Equals(*type) || nsGkAtoms::embed->Equals(*type); + mIsInIframe = nsGkAtoms::iframe->Equals(*type); + } + } + if (!mIsInIframe) { + mFullZoom = ComputeFullZoom(); + } + } + + MaybeSendIntrinsicSizeAndRatioToEmbedder(); +} + +//---------------------------------------------------------------------- +// nsQueryFrame methods + +NS_QUERYFRAME_HEAD(SVGOuterSVGFrame) + NS_QUERYFRAME_ENTRY(SVGOuterSVGFrame) + NS_QUERYFRAME_ENTRY(ISVGSVGFrame) +NS_QUERYFRAME_TAIL_INHERITING(SVGDisplayContainerFrame) + +//---------------------------------------------------------------------- +// nsIFrame methods +//---------------------------------------------------------------------- +// reflowing + +/* virtual */ +nscoord SVGOuterSVGFrame::GetMinISize(gfxContext* aRenderingContext) { + nscoord result; + DISPLAY_MIN_INLINE_SIZE(this, result); + + // If this ever changes to return something other than zero, then + // nsSubDocumentFrame::GetMinISize will also need to change. + result = nscoord(0); + + return result; +} + +/* virtual */ +nscoord SVGOuterSVGFrame::GetPrefISize(gfxContext* aRenderingContext) { + nscoord result; + DISPLAY_PREF_INLINE_SIZE(this, result); + + SVGSVGElement* svg = static_cast<SVGSVGElement*>(GetContent()); + WritingMode wm = GetWritingMode(); + const SVGAnimatedLength& isize = + wm.IsVertical() ? svg->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT] + : svg->mLengthAttributes[SVGSVGElement::ATTR_WIDTH]; + + if (Maybe<nscoord> containISize = + ContainSizeAxesIfApplicable(this).ContainIntrinsicISize(*this)) { + result = *containISize; + } else if (isize.IsPercentage()) { + // If we are here, our inline size attribute is a percentage either + // explicitly (via an attribute value) or implicitly (by being unset, which + // is treated as 100%). The following if-condition, deciding to return + // either the fallback intrinsic size or zero, is made to match blink and + // webkit's behavior for webcompat. + if (isize.IsExplicitlySet() || StylePosition()->ISize(wm).HasPercent() || + !GetAspectRatio()) { + result = wm.IsVertical() ? kFallbackIntrinsicSize.height + : kFallbackIntrinsicSize.width; + } else { + result = nscoord(0); + } + } else { + result = nsPresContext::CSSPixelsToAppUnits(isize.GetAnimValue(svg)); + if (result < 0) { + result = nscoord(0); + } + } + + return result; +} + +/* virtual */ +IntrinsicSize SVGOuterSVGFrame::GetIntrinsicSize() { + // XXXjwatt Note that here we want to return the CSS width/height if they're + // specified and we're embedded inside an nsIObjectLoadingContent. + + const auto containAxes = ContainSizeAxesIfApplicable(this); + if (containAxes.IsBoth()) { + // Intrinsic size of 'contain:size' replaced elements is determined by + // contain-intrinsic-size, defaulting to 0x0. + return FinishIntrinsicSize(containAxes, IntrinsicSize(0, 0)); + } + + SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent()); + const SVGAnimatedLength& width = + content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH]; + const SVGAnimatedLength& height = + content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT]; + + IntrinsicSize intrinsicSize; + + if (!width.IsPercentage()) { + nscoord val = + nsPresContext::CSSPixelsToAppUnits(width.GetAnimValue(content)); + intrinsicSize.width.emplace(std::max(val, 0)); + } + + if (!height.IsPercentage()) { + nscoord val = + nsPresContext::CSSPixelsToAppUnits(height.GetAnimValue(content)); + intrinsicSize.height.emplace(std::max(val, 0)); + } + + return FinishIntrinsicSize(containAxes, intrinsicSize); +} + +/* virtual */ +AspectRatio SVGOuterSVGFrame::GetIntrinsicRatio() const { + if (ContainSizeAxesIfApplicable(this).IsAny()) { + return AspectRatio(); + } + + // We only have an intrinsic size/ratio if our width and height attributes + // are both specified and set to non-percentage values, or we have a viewBox + // rect: https://svgwg.org/svg2-draft/coords.html#SizingSVGInCSS + + auto* content = static_cast<SVGSVGElement*>(GetContent()); + const SVGAnimatedLength& width = + content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH]; + const SVGAnimatedLength& height = + content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT]; + if (!width.IsPercentage() && !height.IsPercentage()) { + // Use width/height ratio only if + // 1. it's not a degenerate ratio, and + // 2. width and height are non-negative numbers. + // Otherwise, we use the viewbox rect. + // https://github.com/w3c/csswg-drafts/issues/6286 + const float w = width.GetAnimValue(content); + const float h = height.GetAnimValue(content); + if (w > 0.0f && h > 0.0f) { + return AspectRatio::FromSize(w, h); + } + } + + const auto& viewBox = content->GetViewBoxInternal(); + if (viewBox.HasRect()) { + const auto& anim = viewBox.GetAnimValue(); + return AspectRatio::FromSize(anim.width, anim.height); + } + + return SVGDisplayContainerFrame::GetIntrinsicRatio(); +} + +/* virtual */ +nsIFrame::SizeComputationResult SVGOuterSVGFrame::ComputeSize( + gfxContext* aRenderingContext, WritingMode aWritingMode, + const LogicalSize& aCBSize, nscoord aAvailableISize, + const LogicalSize& aMargin, const LogicalSize& aBorderPadding, + const StyleSizeOverrides& aSizeOverrides, ComputeSizeFlags aFlags) { + if (IsRootOfImage() || mIsInObjectOrEmbed) { + // The embedding element has sized itself using the CSS replaced element + // sizing rules, using our intrinsic dimensions as necessary. The SVG spec + // says that the width and height of embedded SVG is overridden by the + // width and height of the embedding element, so we just need to size to + // the viewport that the embedding element has established for us. + return {aCBSize, AspectRatioUsage::None}; + } + + LogicalSize cbSize = aCBSize; + IntrinsicSize intrinsicSize = GetIntrinsicSize(); + + if (mIsRootContent) { + // We're the root of the outermost browsing context, so we need to scale + // cbSize by the full-zoom so that SVGs with percentage width/height zoom: + + NS_ASSERTION(aCBSize.ISize(aWritingMode) != NS_UNCONSTRAINEDSIZE && + aCBSize.BSize(aWritingMode) != NS_UNCONSTRAINEDSIZE, + "root should not have auto-width/height containing block"); + + if (!mIsInIframe) { + // NOTE: We can't just use mFullZoom because this can run before Reflow() + // updates it. + const float zoom = ComputeFullZoom(); + cbSize.ISize(aWritingMode) *= zoom; + cbSize.BSize(aWritingMode) *= zoom; + } + + // We also need to honour the width and height attributes' default values + // of 100% when we're the root of a browsing context. (GetIntrinsicSize() + // doesn't report these since there's no such thing as a percentage + // intrinsic size. Also note that explicit percentage values are mapped + // into style, so the following isn't for them.) + + auto* content = static_cast<SVGSVGElement*>(GetContent()); + + const SVGAnimatedLength& width = + content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH]; + if (width.IsPercentage()) { + MOZ_ASSERT(!intrinsicSize.width, + "GetIntrinsicSize should have reported no intrinsic width"); + float val = width.GetAnimValInSpecifiedUnits() / 100.0f; + intrinsicSize.width.emplace(std::max(val, 0.0f) * + cbSize.Width(aWritingMode)); + } + + const SVGAnimatedLength& height = + content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT]; + NS_ASSERTION(aCBSize.BSize(aWritingMode) != NS_UNCONSTRAINEDSIZE, + "root should not have auto-height containing block"); + if (height.IsPercentage()) { + MOZ_ASSERT(!intrinsicSize.height, + "GetIntrinsicSize should have reported no intrinsic height"); + float val = height.GetAnimValInSpecifiedUnits() / 100.0f; + intrinsicSize.height.emplace(std::max(val, 0.0f) * + cbSize.Height(aWritingMode)); + } + MOZ_ASSERT(intrinsicSize.height && intrinsicSize.width, + "We should have just handled the only situation where" + "we lack an intrinsic height or width."); + } + + return {ComputeSizeWithIntrinsicDimensions( + aRenderingContext, aWritingMode, intrinsicSize, GetAspectRatio(), + cbSize, aMargin, aBorderPadding, aSizeOverrides, aFlags), + AspectRatioUsage::None}; +} + +void SVGOuterSVGFrame::Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) { + MarkInReflow(); + DO_GLOBAL_REFLOW_COUNT("SVGOuterSVGFrame"); + DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus); + MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!"); + NS_FRAME_TRACE( + NS_FRAME_TRACE_CALLS, + ("enter SVGOuterSVGFrame::Reflow: availSize=%d,%d", + aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight())); + + MOZ_ASSERT(HasAnyStateBits(NS_FRAME_IN_REFLOW), "frame is not in reflow"); + + const auto wm = GetWritingMode(); + aDesiredSize.SetSize(wm, aReflowInput.ComputedSizeWithBorderPadding(wm)); + + NS_ASSERTION(!GetPrevInFlow(), "SVG can't currently be broken across pages."); + + SVGSVGElement* svgElem = static_cast<SVGSVGElement*>(GetContent()); + + auto* anonKid = static_cast<SVGOuterSVGAnonChildFrame*>( + PrincipalChildList().FirstChild()); + + if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { + // Initialize + svgElem->UpdateHasChildrenOnlyTransform(); + } + + // If our SVG viewport has changed, update our content and notify. + // http://www.w3.org/TR/SVG11/coords.html#ViewportSpace + + gfx::Size newViewportSize( + nsPresContext::AppUnitsToFloatCSSPixels(aReflowInput.ComputedWidth()), + nsPresContext::AppUnitsToFloatCSSPixels(aReflowInput.ComputedHeight())); + + uint32_t changeBits = 0; + if (newViewportSize != svgElem->GetViewportSize()) { + // When our viewport size changes, we may need to update the overflow rects + // of our child frames. This is the case if: + // + // * We have a real/synthetic viewBox (a children-only transform), since + // the viewBox transform will change as the viewport dimensions change. + // + // * We do not have a real/synthetic viewBox, but the last time we + // reflowed (or the last time UpdateOverflow() was called) we did. + // + // We only handle the former case here, in which case we mark all our child + // frames as dirty so that we reflow them below and update their overflow + // rects. + // + // In the latter case, updating of overflow rects is handled for removal of + // real viewBox (the viewBox attribute) in AttributeChanged. Synthetic + // viewBox "removal" (e.g. a document references the same SVG via both an + // <svg:image> and then as a CSS background image (a synthetic viewBox is + // used when painting the former, but not when painting the latter)) is + // handled in SVGSVGElement::FlushImageTransformInvalidation. + // + if (svgElem->HasViewBoxOrSyntheticViewBox()) { + nsIFrame* anonChild = PrincipalChildList().FirstChild(); + anonChild->MarkSubtreeDirty(); + for (nsIFrame* child : anonChild->PrincipalChildList()) { + child->MarkSubtreeDirty(); + } + } + changeBits |= COORD_CONTEXT_CHANGED; + svgElem->SetViewportSize(newViewportSize); + } + if (mIsRootContent && !mIsInIframe) { + const auto oldZoom = mFullZoom; + mFullZoom = ComputeFullZoom(); + if (oldZoom != mFullZoom) { + changeBits |= FULL_ZOOM_CHANGED; + } + } + if (changeBits && !HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { + NotifyViewportOrTransformChanged(changeBits); + } + + // Now that we've marked the necessary children as dirty, call + // ReflowSVG() or ReflowSVGNonDisplayText() on them, depending + // on whether we are non-display. + mCallingReflowSVG = true; + if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) { + ReflowSVGNonDisplayText(this); + } else { + // Update the mRects and ink overflow rects of all our descendants, + // including our anonymous wrapper kid: + anonKid->ReflowSVG(); + MOZ_ASSERT(!anonKid->GetNextSibling(), + "We should have one anonymous child frame wrapping our real " + "children"); + } + mCallingReflowSVG = false; + + // Set our anonymous kid's offset from our border box: + anonKid->SetPosition(GetContentRectRelativeToSelf().TopLeft()); + + // Including our size in our overflow rects regardless of the value of + // 'background', 'border', etc. makes sure that we usually (when we clip to + // our content area) don't have to keep changing our overflow rects as our + // descendants move about (see perf comment below). Including our size in our + // scrollable overflow rect also makes sure that we scroll if we're too big + // for our viewport. + // + // <svg> never allows scrolling to anything outside its mRect (only panning), + // so we must always keep our scrollable overflow set to our size. + // + // With regards to ink overflow, we always clip root-<svg> (see our + // BuildDisplayList method) regardless of the value of the 'overflow' + // property since that is per-spec, even for the initial 'visible' value. For + // that reason there's no point in adding descendant ink overflow to our + // own when this frame is for a root-<svg>. That said, there's also a very + // good performance reason for us wanting to avoid doing so. If we did, then + // the frame's overflow would often change as descendants that are partially + // or fully outside its rect moved (think animation on/off screen), and that + // would cause us to do a full NS_FRAME_IS_DIRTY reflow and repaint of the + // entire document tree each such move (see bug 875175). + // + // So it's only non-root outer-<svg> that has the ink overflow of its + // descendants added to its own. (Note that the default user-agent style + // sheet makes 'hidden' the default value for :not(root(svg)), so usually + // FinishAndStoreOverflow will still clip this back to the frame's rect.) + // + // WARNING!! Keep UpdateBounds below in sync with whatever we do for our + // overflow rects here! (Again, see bug 875175.) + // + aDesiredSize.SetOverflowAreasToDesiredBounds(); + + // An outer SVG will be here as a nondisplay if it fails the conditional + // processing test. In that case, we don't maintain its overflow. + if (!HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) { + if (!mIsRootContent) { + aDesiredSize.mOverflowAreas.InkOverflow().UnionRect( + aDesiredSize.mOverflowAreas.InkOverflow(), + anonKid->InkOverflowRect() + anonKid->GetPosition()); + } + FinishAndStoreOverflow(&aDesiredSize); + } + + NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS, + ("exit SVGOuterSVGFrame::Reflow: size=%d,%d", + aDesiredSize.Width(), aDesiredSize.Height())); +} + +void SVGOuterSVGFrame::DidReflow(nsPresContext* aPresContext, + const ReflowInput* aReflowInput) { + SVGDisplayContainerFrame::DidReflow(aPresContext, aReflowInput); + + // Make sure elements styled by :hover get updated if script/animation moves + // them under or out from under the pointer: + PresShell()->SynthesizeMouseMove(false); +} + +/* virtual */ +void SVGOuterSVGFrame::UnionChildOverflow(OverflowAreas& aOverflowAreas) { + // See the comments in Reflow above. + + // WARNING!! Keep this in sync with Reflow above! + + if (!mIsRootContent) { + nsIFrame* anonKid = PrincipalChildList().FirstChild(); + aOverflowAreas.InkOverflow().UnionRect( + aOverflowAreas.InkOverflow(), + anonKid->InkOverflowRect() + anonKid->GetPosition()); + } +} + +//---------------------------------------------------------------------- +// container methods + +nsresult SVGOuterSVGFrame::AttributeChanged(int32_t aNameSpaceID, + nsAtom* aAttribute, + int32_t aModType) { + if (aNameSpaceID == kNameSpaceID_None && + !HasAnyStateBits(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_NONDISPLAY)) { + if (aAttribute == nsGkAtoms::viewBox || + aAttribute == nsGkAtoms::preserveAspectRatio || + aAttribute == nsGkAtoms::transform) { + // make sure our cached transform matrix gets (lazily) updated + mCanvasTM = nullptr; + + SVGUtils::NotifyChildrenOfSVGChange( + PrincipalChildList().FirstChild(), + aAttribute == nsGkAtoms::viewBox + ? TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED + : TRANSFORM_CHANGED); + + if (aAttribute != nsGkAtoms::transform) { + static_cast<SVGSVGElement*>(GetContent()) + ->ChildrenOnlyTransformChanged(); + } + } + if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height || + aAttribute == nsGkAtoms::viewBox) { + // Don't call ChildrenOnlyTransformChanged() here, since we call it + // under Reflow if the width/height/viewBox actually changed. + + MaybeSendIntrinsicSizeAndRatioToEmbedder(); + + if (!mIsInObjectOrEmbed) { + // We are not embedded by reference, so our 'width' and 'height' + // attributes are not overridden (and viewBox may influence our + // intrinsic aspect ratio). We need to reflow. + PresShell()->FrameNeedsReflow( + this, IntrinsicDirty::FrameAncestorsAndDescendants, + NS_FRAME_IS_DIRTY); + } + } + } + + return NS_OK; +} + +bool SVGOuterSVGFrame::IsSVGTransformed(Matrix* aOwnTransform, + Matrix* aFromParentTransform) const { + // Our anonymous child's HasChildrenOnlyTransform() implementation makes sure + // our children-only transforms are applied to our children. We only care + // about transforms that transform our own frame here. + + bool foundTransform = false; + + SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent()); + SVGAnimatedTransformList* transformList = content->GetAnimatedTransformList(); + if ((transformList && transformList->HasTransform()) || + content->GetAnimateMotionTransform()) { + if (aOwnTransform) { + *aOwnTransform = gfx::ToMatrix( + content->PrependLocalTransformsTo(gfxMatrix(), eUserSpaceToParent)); + } + foundTransform = true; + } + + return foundTransform; +} + +//---------------------------------------------------------------------- +// painting + +void SVGOuterSVGFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, + const nsDisplayListSet& aLists) { + if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) { + return; + } + + DisplayBorderBackgroundOutline(aBuilder, aLists); + + nsRect visibleRect = aBuilder->GetVisibleRect(); + nsRect dirtyRect = aBuilder->GetDirtyRect(); + + // Per-spec, we always clip root-<svg> even when 'overflow' has its initial + // value of 'visible'. See also the "ink overflow" comments in Reflow. + DisplayListClipState::AutoSaveRestore autoSR(aBuilder); + if (mIsRootContent || StyleDisplay()->IsScrollableOverflow()) { + autoSR.ClipContainingBlockDescendantsToContentBox(aBuilder, this); + visibleRect = visibleRect.Intersect(GetContentRectRelativeToSelf()); + dirtyRect = dirtyRect.Intersect(GetContentRectRelativeToSelf()); + } + + nsDisplayListBuilder::AutoBuildingDisplayList building( + aBuilder, this, visibleRect, dirtyRect); + + nsDisplayList* contentList = aLists.Content(); + nsDisplayListSet set(contentList, contentList, contentList, contentList, + contentList, contentList); + BuildDisplayListForNonBlockChildren(aBuilder, set); +} + +//---------------------------------------------------------------------- +// ISVGSVGFrame methods: + +void SVGOuterSVGFrame::NotifyViewportOrTransformChanged(uint32_t aFlags) { + MOZ_ASSERT(aFlags && !(aFlags & ~(COORD_CONTEXT_CHANGED | TRANSFORM_CHANGED | + FULL_ZOOM_CHANGED)), + "Unexpected aFlags value"); + + SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent()); + + if (aFlags & COORD_CONTEXT_CHANGED) { + if (content->HasViewBox()) { + // Percentage lengths on children resolve against the viewBox rect so we + // don't need to notify them of the viewport change, but the viewBox + // transform will have changed, so we need to notify them of that instead. + aFlags = TRANSFORM_CHANGED; + } else if (content->ShouldSynthesizeViewBox()) { + // In the case of a synthesized viewBox, the synthetic viewBox's rect + // changes as the viewport changes. As a result we need to maintain the + // COORD_CONTEXT_CHANGED flag. + aFlags |= TRANSFORM_CHANGED; + } else if (mCanvasTM && mCanvasTM->IsSingular()) { + // A width/height of zero will result in us having a singular mCanvasTM + // even when we don't have a viewBox. So we also want to recompute our + // mCanvasTM for this width/height change even though we don't have a + // viewBox. + aFlags |= TRANSFORM_CHANGED; + } + } + + bool haveNonFulLZoomTransformChange = (aFlags & TRANSFORM_CHANGED); + + if (aFlags & FULL_ZOOM_CHANGED) { + // Convert FULL_ZOOM_CHANGED to TRANSFORM_CHANGED: + aFlags = (aFlags & ~FULL_ZOOM_CHANGED) | TRANSFORM_CHANGED; + } + + if (aFlags & TRANSFORM_CHANGED) { + // Make sure our canvas transform matrix gets (lazily) recalculated: + mCanvasTM = nullptr; + + if (haveNonFulLZoomTransformChange && + !HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) { + uint32_t flags = HasAnyStateBits(NS_FRAME_IN_REFLOW) + ? SVGSVGElement::eDuringReflow + : 0; + content->ChildrenOnlyTransformChanged(flags); + } + } + + SVGUtils::NotifyChildrenOfSVGChange(PrincipalChildList().FirstChild(), + aFlags); +} + +//---------------------------------------------------------------------- +// ISVGDisplayableFrame methods: + +void SVGOuterSVGFrame::PaintSVG(gfxContext& aContext, + const gfxMatrix& aTransform, + imgDrawingParams& aImgParams) { + NS_ASSERTION( + PrincipalChildList().FirstChild()->IsSVGOuterSVGAnonChildFrame() && + !PrincipalChildList().FirstChild()->GetNextSibling(), + "We should have a single, anonymous, child"); + auto* anonKid = static_cast<SVGOuterSVGAnonChildFrame*>( + PrincipalChildList().FirstChild()); + anonKid->PaintSVG(aContext, aTransform, aImgParams); +} + +SVGBBox SVGOuterSVGFrame::GetBBoxContribution( + const gfx::Matrix& aToBBoxUserspace, uint32_t aFlags) { + NS_ASSERTION( + PrincipalChildList().FirstChild()->IsSVGOuterSVGAnonChildFrame() && + !PrincipalChildList().FirstChild()->GetNextSibling(), + "We should have a single, anonymous, child"); + // We must defer to our child so that we don't include our + // content->PrependLocalTransformsTo() transforms. + auto* anonKid = static_cast<SVGOuterSVGAnonChildFrame*>( + PrincipalChildList().FirstChild()); + return anonKid->GetBBoxContribution(aToBBoxUserspace, aFlags); +} + +//---------------------------------------------------------------------- +// SVGContainerFrame methods: + +gfxMatrix SVGOuterSVGFrame::GetCanvasTM() { + if (!mCanvasTM) { + SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent()); + + float devPxPerCSSPx = 1.0f / nsPresContext::AppUnitsToFloatCSSPixels( + PresContext()->AppUnitsPerDevPixel()); + + gfxMatrix tm = content->PrependLocalTransformsTo( + gfxMatrix::Scaling(devPxPerCSSPx, devPxPerCSSPx)); + mCanvasTM = MakeUnique<gfxMatrix>(tm); + } + return *mCanvasTM; +} + +//---------------------------------------------------------------------- +// Implementation helpers + +bool SVGOuterSVGFrame::IsRootOfImage() { + if (!mContent->GetParent()) { + // Our content is the document element + Document* doc = mContent->GetUncomposedDoc(); + if (doc && doc->IsBeingUsedAsImage()) { + // Our document is being used as an image + return true; + } + } + + return false; +} + +bool SVGOuterSVGFrame::VerticalScrollbarNotNeeded() const { + const SVGAnimatedLength& height = + static_cast<SVGSVGElement*>(GetContent()) + ->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT]; + return height.IsPercentage() && height.GetBaseValInSpecifiedUnits() <= 100; +} + +void SVGOuterSVGFrame::AppendDirectlyOwnedAnonBoxes( + nsTArray<OwnedAnonBox>& aResult) { + nsIFrame* anonKid = PrincipalChildList().FirstChild(); + MOZ_ASSERT(anonKid->IsSVGOuterSVGAnonChildFrame()); + aResult.AppendElement(OwnedAnonBox(anonKid)); +} + +void SVGOuterSVGFrame::MaybeSendIntrinsicSizeAndRatioToEmbedder() { + MaybeSendIntrinsicSizeAndRatioToEmbedder(Some(GetIntrinsicSize()), + Some(GetAspectRatio())); +} + +void SVGOuterSVGFrame::MaybeSendIntrinsicSizeAndRatioToEmbedder( + Maybe<IntrinsicSize> aIntrinsicSize, Maybe<AspectRatio> aIntrinsicRatio) { + if (!mIsInObjectOrEmbed) { + return; + } + + nsCOMPtr<nsIDocShell> docShell = PresContext()->GetDocShell(); + if (!docShell) { + return; + } + + BrowsingContext* bc = docShell->GetBrowsingContext(); + MOZ_ASSERT(bc->IsContentSubframe()); + + if (bc->GetParent()->IsInProcess()) { + if (Element* embedder = bc->GetEmbedderElement()) { + if (nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(embedder)) { + static_cast<nsObjectLoadingContent*>(olc.get()) + ->SubdocumentIntrinsicSizeOrRatioChanged(aIntrinsicSize, + aIntrinsicRatio); + } + return; + } + } + + if (BrowserChild* browserChild = BrowserChild::GetFrom(docShell)) { + Unused << browserChild->SendIntrinsicSizeOrRatioChanged(aIntrinsicSize, + aIntrinsicRatio); + } +} + +void SVGOuterSVGFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) { + SVGDisplayContainerFrame::DidSetComputedStyle(aOldComputedStyle); + + if (!aOldComputedStyle) { + return; + } + + if (aOldComputedStyle->StylePosition()->mAspectRatio != + StylePosition()->mAspectRatio) { + // Our aspect-ratio property value changed, and an embedding <object> or + // <embed> might care about that. + MaybeSendIntrinsicSizeAndRatioToEmbedder(); + } +} + +void SVGOuterSVGFrame::Destroy(DestroyContext& aContext) { + // This handles both the case when the root <svg> element is made display:none + // (and thus loses its intrinsic size and aspect ratio), and when the frame + // is navigated elsewhere & we need to reset parent <object>/<embed>'s + // recorded intrinsic size/ratio values. + MaybeSendIntrinsicSizeAndRatioToEmbedder(Nothing(), Nothing()); + + SVGDisplayContainerFrame::Destroy(aContext); +} + +} // namespace mozilla + +//---------------------------------------------------------------------- +// Implementation of SVGOuterSVGAnonChildFrame + +nsContainerFrame* NS_NewSVGOuterSVGAnonChildFrame( + mozilla::PresShell* aPresShell, mozilla::ComputedStyle* aStyle) { + return new (aPresShell) + mozilla::SVGOuterSVGAnonChildFrame(aStyle, aPresShell->GetPresContext()); +} + +namespace mozilla { + +NS_IMPL_FRAMEARENA_HELPERS(SVGOuterSVGAnonChildFrame) + +#ifdef DEBUG +void SVGOuterSVGAnonChildFrame::Init(nsIContent* aContent, + nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) { + MOZ_ASSERT(aParent->IsSVGOuterSVGFrame(), "Unexpected parent"); + SVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow); +} +#endif + +void SVGOuterSVGAnonChildFrame::BuildDisplayList( + nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) { + // Wrap our contents into an nsDisplaySVGWrapper. + // We wrap this frame instead of the SVGOuterSVGFrame so that the wrapper + // doesn't contain the <svg> element's CSS styles, like backgrounds or + // borders. Creating the nsDisplaySVGWrapper here also means that it'll be + // inside the nsDisplayTransform for our viewbox transform. The + // nsDisplaySVGWrapper's reference frame is this frame, because this frame + // always returns true from IsSVGTransformed. + nsDisplayList newList(aBuilder); + nsDisplayListSet set(&newList, &newList, &newList, &newList, &newList, + &newList); + BuildDisplayListForNonBlockChildren(aBuilder, set); + aLists.Content()->AppendNewToTop<nsDisplaySVGWrapper>(aBuilder, this, + &newList); +} + +static Matrix ComputeOuterSVGAnonChildFrameTransform( + const SVGOuterSVGAnonChildFrame* aFrame) { + // Our elements 'transform' attribute is applied to our SVGOuterSVGFrame + // parent, and the element's children-only transforms are applied to us, the + // anonymous child frame. Since we are the child frame, we apply the + // children-only transforms as if they are our own transform. + SVGSVGElement* content = static_cast<SVGSVGElement*>(aFrame->GetContent()); + + if (!content->HasChildrenOnlyTransform()) { + return Matrix(); + } + + // Outer-<svg> doesn't use x/y, so we can pass eChildToUserSpace here. + gfxMatrix ownMatrix = + content->PrependLocalTransformsTo(gfxMatrix(), eChildToUserSpace); + + if (ownMatrix.HasNonTranslation()) { + // viewBox, currentScale and currentTranslate should only produce a + // rectilinear transform. + MOZ_ASSERT(ownMatrix.IsRectilinear(), + "Non-rectilinear transform will break the following logic"); + + // The nsDisplayTransform code will apply this transform to our frame, + // including to our frame position. We don't want our frame position to + // be scaled though, so we need to correct for that in the transform. + // XXX Yeah, this is a bit hacky. + CSSPoint pos = CSSPixel::FromAppUnits(aFrame->GetPosition()); + CSSPoint scaledPos = CSSPoint(ownMatrix._11 * pos.x, ownMatrix._22 * pos.y); + CSSPoint deltaPos = scaledPos - pos; + ownMatrix *= gfxMatrix::Translation(-deltaPos.x, -deltaPos.y); + } + + return gfx::ToMatrix(ownMatrix); +} + +// We want this frame to be a reference frame. An easy way to achieve that is +// to always return true from this method, even for identity transforms. +// This frame being a reference frame ensures that the offset between this +// <svg> element and the parent reference frame is completely absorbed by the +// nsDisplayTransform that's created for this frame, and that this offset does +// not affect our descendants' transforms. Consequently, if the <svg> element +// moves, e.g. during scrolling, the transform matrices of our contents are +// unaffected. This simplifies invalidation. +bool SVGOuterSVGAnonChildFrame::IsSVGTransformed( + Matrix* aOwnTransform, Matrix* aFromParentTransform) const { + if (aOwnTransform) { + *aOwnTransform = ComputeOuterSVGAnonChildFrameTransform(this); + } + + return true; +} + +} // namespace mozilla |