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Diffstat (limited to 'layout/svg/SVGUtils.cpp')
| -rw-r--r-- | layout/svg/SVGUtils.cpp | 1558 |
1 files changed, 1558 insertions, 0 deletions
diff --git a/layout/svg/SVGUtils.cpp b/layout/svg/SVGUtils.cpp new file mode 100644 index 0000000000..206f56cedd --- /dev/null +++ b/layout/svg/SVGUtils.cpp @@ -0,0 +1,1558 @@ +/* -*- 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: +// This is also necessary to ensure our definition of M_SQRT1_2 is picked up +#include "SVGUtils.h" +#include <algorithm> + +// Keep others in (case-insensitive) order: +#include "gfx2DGlue.h" +#include "gfxContext.h" +#include "gfxMatrix.h" +#include "gfxPlatform.h" +#include "gfxRect.h" +#include "gfxUtils.h" +#include "nsCSSFrameConstructor.h" +#include "nsDisplayList.h" +#include "nsFrameList.h" +#include "nsGkAtoms.h" +#include "nsIContent.h" +#include "nsIFrame.h" +#include "nsIFrameInlines.h" +#include "nsLayoutUtils.h" +#include "nsPresContext.h" +#include "nsStyleStruct.h" +#include "nsStyleTransformMatrix.h" +#include "SVGAnimatedLength.h" +#include "SVGPaintServerFrame.h" +#include "nsTextFrame.h" +#include "mozilla/CSSClipPathInstance.h" +#include "mozilla/FilterInstance.h" +#include "mozilla/ISVGDisplayableFrame.h" +#include "mozilla/Preferences.h" +#include "mozilla/StaticPrefs_svg.h" +#include "mozilla/SVGClipPathFrame.h" +#include "mozilla/SVGContainerFrame.h" +#include "mozilla/SVGContentUtils.h" +#include "mozilla/SVGContextPaint.h" +#include "mozilla/SVGForeignObjectFrame.h" +#include "mozilla/SVGIntegrationUtils.h" +#include "mozilla/SVGGeometryFrame.h" +#include "mozilla/SVGMaskFrame.h" +#include "mozilla/SVGObserverUtils.h" +#include "mozilla/SVGOuterSVGFrame.h" +#include "mozilla/SVGTextFrame.h" +#include "mozilla/Unused.h" +#include "mozilla/gfx/2D.h" +#include "mozilla/gfx/PatternHelpers.h" +#include "mozilla/dom/Document.h" +#include "mozilla/dom/SVGClipPathElement.h" +#include "mozilla/dom/SVGGeometryElement.h" +#include "mozilla/dom/SVGPathElement.h" +#include "mozilla/dom/SVGUnitTypesBinding.h" +#include "mozilla/dom/SVGViewportElement.h" + +using namespace mozilla::dom; +using namespace mozilla::dom::SVGUnitTypes_Binding; +using namespace mozilla::gfx; +using namespace mozilla::image; + +bool NS_SVGNewGetBBoxEnabled() { + return mozilla::StaticPrefs::svg_new_getBBox_enabled(); +} + +namespace mozilla { + +// we only take the address of this: +static gfx::UserDataKey sSVGAutoRenderStateKey; + +SVGAutoRenderState::SVGAutoRenderState(DrawTarget* aDrawTarget) + : mDrawTarget(aDrawTarget), + mOriginalRenderState(nullptr), + mPaintingToWindow(false) { + mOriginalRenderState = aDrawTarget->RemoveUserData(&sSVGAutoRenderStateKey); + // We always remove ourselves from aContext before it dies, so + // passing nullptr as the destroy function is okay. + aDrawTarget->AddUserData(&sSVGAutoRenderStateKey, this, nullptr); +} + +SVGAutoRenderState::~SVGAutoRenderState() { + mDrawTarget->RemoveUserData(&sSVGAutoRenderStateKey); + if (mOriginalRenderState) { + mDrawTarget->AddUserData(&sSVGAutoRenderStateKey, mOriginalRenderState, + nullptr); + } +} + +void SVGAutoRenderState::SetPaintingToWindow(bool aPaintingToWindow) { + mPaintingToWindow = aPaintingToWindow; +} + +/* static */ +bool SVGAutoRenderState::IsPaintingToWindow(DrawTarget* aDrawTarget) { + void* state = aDrawTarget->GetUserData(&sSVGAutoRenderStateKey); + if (state) { + return static_cast<SVGAutoRenderState*>(state)->mPaintingToWindow; + } + return false; +} + +// Unlike containers, leaf frames do not include GetPosition() in +// GetCanvasTM(). +static bool FrameDoesNotIncludePositionInTM(const nsIFrame* aFrame) { + return aFrame->IsSVGGeometryFrame() || aFrame->IsSVGImageFrame() || + aFrame->IsInSVGTextSubtree(); +} + +nsRect SVGUtils::GetPostFilterInkOverflowRect(nsIFrame* aFrame, + const nsRect& aPreFilterRect) { + MOZ_ASSERT(aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT), + "Called on invalid frame type"); + + // Note: we do not return here for eHasNoRefs since we must still handle any + // CSS filter functions. + // TODO: We currently pass nullptr instead of an nsTArray* here, but we + // actually should get the filter frames and then pass them into + // GetPostFilterBounds below! See bug 1494263. + // TODO: we should really return an empty rect for eHasRefsSomeInvalid since + // in that case we disable painting of the element. + if (!aFrame->StyleEffects()->HasFilters() || + SVGObserverUtils::GetAndObserveFilters(aFrame, nullptr) == + SVGObserverUtils::eHasRefsSomeInvalid) { + return aPreFilterRect; + } + + return FilterInstance::GetPostFilterBounds(aFrame, nullptr, &aPreFilterRect) + .valueOr(aPreFilterRect); +} + +bool SVGUtils::OuterSVGIsCallingReflowSVG(nsIFrame* aFrame) { + return GetOuterSVGFrame(aFrame)->IsCallingReflowSVG(); +} + +bool SVGUtils::AnyOuterSVGIsCallingReflowSVG(nsIFrame* aFrame) { + SVGOuterSVGFrame* outer = GetOuterSVGFrame(aFrame); + do { + if (outer->IsCallingReflowSVG()) { + return true; + } + outer = GetOuterSVGFrame(outer->GetParent()); + } while (outer); + return false; +} + +void SVGUtils::ScheduleReflowSVG(nsIFrame* aFrame) { + MOZ_ASSERT(aFrame->IsFrameOfType(nsIFrame::eSVG), "Passed bad frame!"); + + // If this is triggered, the callers should be fixed to call us before + // ReflowSVG is called. If we try to mark dirty bits on frames while we're + // in the process of removing them, things will get messed up. + MOZ_ASSERT(!OuterSVGIsCallingReflowSVG(aFrame), + "Do not call under ISVGDisplayableFrame::ReflowSVG!"); + + // We don't call SVGObserverUtils::InvalidateRenderingObservers here because + // we should only be called under InvalidateAndScheduleReflowSVG (which + // calls InvalidateBounds) or SVGDisplayContainerFrame::InsertFrames + // (at which point the frame has no observers). + + if (aFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) { + return; + } + + if (aFrame->HasAnyStateBits(NS_FRAME_IS_DIRTY | NS_FRAME_FIRST_REFLOW)) { + // Nothing to do if we're already dirty, or if the outer-<svg> + // hasn't yet had its initial reflow. + return; + } + + SVGOuterSVGFrame* outerSVGFrame = nullptr; + + // We must not add dirty bits to the SVGOuterSVGFrame or else + // PresShell::FrameNeedsReflow won't work when we pass it in below. + if (aFrame->IsSVGOuterSVGFrame()) { + outerSVGFrame = static_cast<SVGOuterSVGFrame*>(aFrame); + } else { + aFrame->MarkSubtreeDirty(); + + nsIFrame* f = aFrame->GetParent(); + while (f && !f->IsSVGOuterSVGFrame()) { + if (f->HasAnyStateBits(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) { + return; + } + f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); + f = f->GetParent(); + MOZ_ASSERT(f->IsFrameOfType(nsIFrame::eSVG), + "IsSVGOuterSVGFrame check above not valid!"); + } + + outerSVGFrame = static_cast<SVGOuterSVGFrame*>(f); + + MOZ_ASSERT(outerSVGFrame && outerSVGFrame->IsSVGOuterSVGFrame(), + "Did not find SVGOuterSVGFrame!"); + } + + if (outerSVGFrame->HasAnyStateBits(NS_FRAME_IN_REFLOW)) { + // We're currently under an SVGOuterSVGFrame::Reflow call so there is no + // need to call PresShell::FrameNeedsReflow, since we have an + // SVGOuterSVGFrame::DidReflow call pending. + return; + } + + nsFrameState dirtyBit = + (outerSVGFrame == aFrame ? NS_FRAME_IS_DIRTY + : NS_FRAME_HAS_DIRTY_CHILDREN); + + aFrame->PresShell()->FrameNeedsReflow(outerSVGFrame, IntrinsicDirty::None, + dirtyBit); +} + +bool SVGUtils::NeedsReflowSVG(const nsIFrame* aFrame) { + MOZ_ASSERT(aFrame->IsFrameOfType(nsIFrame::eSVG), + "SVG uses bits differently!"); + + // The flags we test here may change, hence why we have this separate + // function. + return aFrame->IsSubtreeDirty(); +} + +Size SVGUtils::GetContextSize(const nsIFrame* aFrame) { + Size size; + + MOZ_ASSERT(aFrame->GetContent()->IsSVGElement(), "bad cast"); + const SVGElement* element = static_cast<SVGElement*>(aFrame->GetContent()); + + SVGViewportElement* ctx = element->GetCtx(); + if (ctx) { + size.width = ctx->GetLength(SVGContentUtils::X); + size.height = ctx->GetLength(SVGContentUtils::Y); + } + return size; +} + +float SVGUtils::ObjectSpace(const gfxRect& aRect, + const SVGAnimatedLength* aLength) { + float axis; + + switch (aLength->GetCtxType()) { + case SVGContentUtils::X: + axis = aRect.Width(); + break; + case SVGContentUtils::Y: + axis = aRect.Height(); + break; + case SVGContentUtils::XY: + axis = float(SVGContentUtils::ComputeNormalizedHypotenuse( + aRect.Width(), aRect.Height())); + break; + default: + MOZ_ASSERT_UNREACHABLE("unexpected ctx type"); + axis = 0.0f; + break; + } + if (aLength->IsPercentage()) { + // Multiply first to avoid precision errors: + return axis * aLength->GetAnimValInSpecifiedUnits() / 100; + } + return aLength->GetAnimValue(static_cast<SVGViewportElement*>(nullptr)) * + axis; +} + +float SVGUtils::UserSpace(SVGElement* aSVGElement, + const SVGAnimatedLength* aLength) { + return aLength->GetAnimValue(aSVGElement); +} + +float SVGUtils::UserSpace(nsIFrame* aNonSVGContext, + const SVGAnimatedLength* aLength) { + MOZ_ASSERT(!aNonSVGContext->IsTextFrame(), "Not expecting text content"); + return aLength->GetAnimValue(aNonSVGContext); +} + +float SVGUtils::UserSpace(const UserSpaceMetrics& aMetrics, + const SVGAnimatedLength* aLength) { + return aLength->GetAnimValue(aMetrics); +} + +SVGOuterSVGFrame* SVGUtils::GetOuterSVGFrame(nsIFrame* aFrame) { + return static_cast<SVGOuterSVGFrame*>(nsLayoutUtils::GetClosestFrameOfType( + aFrame, LayoutFrameType::SVGOuterSVG)); +} + +nsIFrame* SVGUtils::GetOuterSVGFrameAndCoveredRegion(nsIFrame* aFrame, + nsRect* aRect) { + ISVGDisplayableFrame* svg = do_QueryFrame(aFrame); + if (!svg) { + return nullptr; + } + SVGOuterSVGFrame* outer = GetOuterSVGFrame(aFrame); + if (outer == svg) { + return nullptr; + } + + if (aFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) { + *aRect = nsRect(0, 0, 0, 0); + } else { + uint32_t flags = SVGUtils::eForGetClientRects | SVGUtils::eBBoxIncludeFill | + SVGUtils::eBBoxIncludeStroke | + SVGUtils::eBBoxIncludeMarkers | + SVGUtils::eUseUserSpaceOfUseElement; + + auto ctm = nsLayoutUtils::GetTransformToAncestor(RelativeTo{aFrame}, + RelativeTo{outer}); + + float initPositionX = NSAppUnitsToFloatPixels(aFrame->GetPosition().x, + AppUnitsPerCSSPixel()), + initPositionY = NSAppUnitsToFloatPixels(aFrame->GetPosition().y, + AppUnitsPerCSSPixel()); + + Matrix mm; + ctm.ProjectTo2D(); + ctm.CanDraw2D(&mm); + gfxMatrix m = ThebesMatrix(mm); + + float appUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel(); + float devPixelPerCSSPixel = + float(AppUnitsPerCSSPixel()) / appUnitsPerDevPixel; + + // The matrix that GetBBox accepts should operate on "user space", + // i.e. with CSS pixel unit. + m = m.PreScale(devPixelPerCSSPixel, devPixelPerCSSPixel); + + // Both SVGUtils::GetBBox and nsLayoutUtils::GetTransformToAncestor + // will count this displacement, we should remove it here to avoid + // double-counting. + m = m.PreTranslate(-initPositionX, -initPositionY); + + gfxRect bbox = SVGUtils::GetBBox(aFrame, flags, &m); + *aRect = nsLayoutUtils::RoundGfxRectToAppRect(bbox, appUnitsPerDevPixel); + } + + return outer; +} + +gfxMatrix SVGUtils::GetCanvasTM(nsIFrame* aFrame) { + // XXX yuck, we really need a common interface for GetCanvasTM + + if (!aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) { + return GetCSSPxToDevPxMatrix(aFrame); + } + + if (aFrame->IsSVGForeignObjectFrame()) { + return static_cast<SVGForeignObjectFrame*>(aFrame)->GetCanvasTM(); + } + + if (SVGContainerFrame* containerFrame = do_QueryFrame(aFrame)) { + return containerFrame->GetCanvasTM(); + } + + MOZ_ASSERT(aFrame->GetParent()->IsFrameOfType(nsIFrame::eSVGContainer)); + + auto* parent = static_cast<SVGContainerFrame*>(aFrame->GetParent()); + auto* content = static_cast<SVGElement*>(aFrame->GetContent()); + + return content->PrependLocalTransformsTo(parent->GetCanvasTM()); +} + +bool SVGUtils::IsSVGTransformed(const nsIFrame* aFrame, + gfx::Matrix* aOwnTransform, + gfx::Matrix* aFromParentTransform) { + MOZ_ASSERT(aFrame->HasAllStateBits(NS_FRAME_SVG_LAYOUT | + NS_FRAME_MAY_BE_TRANSFORMED), + "Expecting an SVG frame that can be transformed"); + bool foundTransform = false; + + // Check if our parent has children-only transforms: + if (SVGContainerFrame* parent = do_QueryFrame(aFrame->GetParent())) { + foundTransform = parent->HasChildrenOnlyTransform(aFromParentTransform); + } + + if (auto* content = SVGElement::FromNode(aFrame->GetContent())) { + auto* transformList = content->GetAnimatedTransformList(); + if ((transformList && transformList->HasTransform()) || + content->GetAnimateMotionTransform()) { + if (aOwnTransform) { + *aOwnTransform = gfx::ToMatrix( + content->PrependLocalTransformsTo(gfxMatrix(), eUserSpaceToParent)); + } + foundTransform = true; + } + } + return foundTransform; +} + +void SVGUtils::NotifyChildrenOfSVGChange(nsIFrame* aFrame, uint32_t aFlags) { + for (nsIFrame* kid : aFrame->PrincipalChildList()) { + ISVGDisplayableFrame* SVGFrame = do_QueryFrame(kid); + if (SVGFrame) { + SVGFrame->NotifySVGChanged(aFlags); + } else { + NS_ASSERTION( + kid->IsFrameOfType(nsIFrame::eSVG) || kid->IsInSVGTextSubtree(), + "SVG frame expected"); + // recurse into the children of container frames e.g. <clipPath>, <mask> + // in case they have child frames with transformation matrices + if (kid->IsFrameOfType(nsIFrame::eSVG)) { + NotifyChildrenOfSVGChange(kid, aFlags); + } + } + } +} + +// ************************************************************ + +float SVGUtils::ComputeOpacity(const nsIFrame* aFrame, bool aHandleOpacity) { + const auto* styleEffects = aFrame->StyleEffects(); + + if (!styleEffects->IsOpaque() && + (SVGUtils::CanOptimizeOpacity(aFrame) || !aHandleOpacity)) { + return 1.0f; + } + + return styleEffects->mOpacity; +} + +void SVGUtils::DetermineMaskUsage(const nsIFrame* aFrame, bool aHandleOpacity, + MaskUsage& aUsage) { + using ClipPathType = StyleClipPath::Tag; + + aUsage.opacity = ComputeOpacity(aFrame, aHandleOpacity); + + nsIFrame* firstFrame = + nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame); + + const nsStyleSVGReset* svgReset = firstFrame->StyleSVGReset(); + + nsTArray<SVGMaskFrame*> maskFrames; + // XXX check return value? + SVGObserverUtils::GetAndObserveMasks(firstFrame, &maskFrames); + aUsage.shouldGenerateMaskLayer = (maskFrames.Length() > 0); + + SVGClipPathFrame* clipPathFrame; + // XXX check return value? + SVGObserverUtils::GetAndObserveClipPath(firstFrame, &clipPathFrame); + MOZ_ASSERT(!clipPathFrame || svgReset->mClipPath.IsUrl()); + + switch (svgReset->mClipPath.tag) { + case ClipPathType::Url: + if (clipPathFrame) { + if (clipPathFrame->IsTrivial()) { + aUsage.shouldApplyClipPath = true; + } else { + aUsage.shouldGenerateClipMaskLayer = true; + } + } + break; + case ClipPathType::Shape: + case ClipPathType::Box: + case ClipPathType::Path: + aUsage.shouldApplyBasicShapeOrPath = true; + break; + case ClipPathType::None: + MOZ_ASSERT(!aUsage.shouldGenerateClipMaskLayer && + !aUsage.shouldApplyClipPath && + !aUsage.shouldApplyBasicShapeOrPath); + break; + default: + MOZ_ASSERT_UNREACHABLE("Unsupported clip-path type."); + break; + } +} + +class MixModeBlender { + public: + using Factory = gfx::Factory; + + MixModeBlender(nsIFrame* aFrame, gfxContext* aContext) + : mFrame(aFrame), mSourceCtx(aContext) { + MOZ_ASSERT(mFrame && mSourceCtx); + } + + bool ShouldCreateDrawTargetForBlend() const { + return mFrame->StyleEffects()->HasMixBlendMode(); + } + + gfxContext* CreateBlendTarget(const gfxMatrix& aTransform) { + MOZ_ASSERT(ShouldCreateDrawTargetForBlend()); + + // Create a temporary context to draw to so we can blend it back with + // another operator. + IntRect drawRect = ComputeClipExtsInDeviceSpace(aTransform); + if (drawRect.IsEmpty()) { + return nullptr; + } + + RefPtr<DrawTarget> targetDT = + mSourceCtx->GetDrawTarget()->CreateSimilarDrawTarget( + drawRect.Size(), SurfaceFormat::B8G8R8A8); + if (!targetDT || !targetDT->IsValid()) { + return nullptr; + } + + MOZ_ASSERT(!mTargetCtx, + "CreateBlendTarget is designed to be used once only."); + + mTargetCtx = gfxContext::CreateOrNull(targetDT); + MOZ_ASSERT(mTargetCtx); // already checked the draw target above + mTargetCtx->SetMatrix(mSourceCtx->CurrentMatrix() * + Matrix::Translation(-drawRect.TopLeft())); + + mTargetOffset = drawRect.TopLeft(); + + return mTargetCtx.get(); + } + + void BlendToTarget() { + MOZ_ASSERT(ShouldCreateDrawTargetForBlend()); + MOZ_ASSERT(mTargetCtx, + "BlendToTarget should be used after CreateBlendTarget."); + + RefPtr<SourceSurface> targetSurf = mTargetCtx->GetDrawTarget()->Snapshot(); + + gfxContextAutoSaveRestore save(mSourceCtx); + mSourceCtx->SetMatrix(Matrix()); // This will be restored right after. + RefPtr<gfxPattern> pattern = new gfxPattern( + targetSurf, Matrix::Translation(mTargetOffset.x, mTargetOffset.y)); + mSourceCtx->SetPattern(pattern); + mSourceCtx->Paint(); + } + + private: + MixModeBlender() = delete; + + IntRect ComputeClipExtsInDeviceSpace(const gfxMatrix& aTransform) { + // These are used if we require a temporary surface for a custom blend + // mode. Clip the source context first, so that we can generate a smaller + // temporary surface. (Since we will clip this context in + // SetupContextMatrix, a pair of save/restore is needed.) + gfxContextAutoSaveRestore saver; + + if (!mFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) { + saver.SetContext(mSourceCtx); + // aFrame has a valid ink overflow rect, so clip to it before calling + // PushGroup() to minimize the size of the surfaces we'll composite: + gfxContextMatrixAutoSaveRestore matrixAutoSaveRestore(mSourceCtx); + mSourceCtx->Multiply(aTransform); + nsRect overflowRect = mFrame->InkOverflowRectRelativeToSelf(); + if (FrameDoesNotIncludePositionInTM(mFrame)) { + overflowRect = overflowRect + mFrame->GetPosition(); + } + mSourceCtx->Clip(NSRectToSnappedRect( + overflowRect, mFrame->PresContext()->AppUnitsPerDevPixel(), + *mSourceCtx->GetDrawTarget())); + } + + // Get the clip extents in device space. + gfxRect clippedFrameSurfaceRect = + mSourceCtx->GetClipExtents(gfxContext::eDeviceSpace); + clippedFrameSurfaceRect.RoundOut(); + + IntRect result; + ToRect(clippedFrameSurfaceRect).ToIntRect(&result); + + return Factory::CheckSurfaceSize(result.Size()) ? result : IntRect(); + } + + nsIFrame* mFrame; + gfxContext* mSourceCtx; + UniquePtr<gfxContext> mTargetCtx; + IntPoint mTargetOffset; +}; + +void SVGUtils::PaintFrameWithEffects(nsIFrame* aFrame, gfxContext& aContext, + const gfxMatrix& aTransform, + imgDrawingParams& aImgParams) { + NS_ASSERTION(aFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY) || + aFrame->PresContext()->Document()->IsSVGGlyphsDocument(), + "Only painting of non-display SVG should take this code path"); + + ISVGDisplayableFrame* svgFrame = do_QueryFrame(aFrame); + if (!svgFrame) { + return; + } + + MaskUsage maskUsage; + DetermineMaskUsage(aFrame, true, maskUsage); + if (maskUsage.opacity == 0.0f) { + return; + } + + if (auto* svg = SVGElement::FromNode(aFrame->GetContent())) { + if (!svg->HasValidDimensions()) { + return; + } + } + + /* SVG defines the following rendering model: + * + * 1. Render fill + * 2. Render stroke + * 3. Render markers + * 4. Apply filter + * 5. Apply clipping, masking, group opacity + * + * We follow this, but perform a couple of optimizations: + * + * + Use cairo's clipPath when representable natively (single object + * clip region). + * + * + Merge opacity and masking if both used together. + */ + + /* Properties are added lazily and may have been removed by a restyle, + so make sure all applicable ones are set again. */ + SVGClipPathFrame* clipPathFrame; + nsTArray<SVGMaskFrame*> maskFrames; + // TODO: We currently pass nullptr instead of an nsTArray* here, but we + // actually should get the filter frames and then pass them into + // PaintFilteredFrame below! See bug 1494263. + const bool hasInvalidFilter = + SVGObserverUtils::GetAndObserveFilters(aFrame, nullptr) == + SVGObserverUtils::eHasRefsSomeInvalid; + if (SVGObserverUtils::GetAndObserveClipPath(aFrame, &clipPathFrame) == + SVGObserverUtils::eHasRefsSomeInvalid || + SVGObserverUtils::GetAndObserveMasks(aFrame, &maskFrames) == + SVGObserverUtils::eHasRefsSomeInvalid) { + // Some resource is invalid. We shouldn't paint anything. + return; + } + + SVGMaskFrame* maskFrame = maskFrames.IsEmpty() ? nullptr : maskFrames[0]; + + MixModeBlender blender(aFrame, &aContext); + gfxContext* target = blender.ShouldCreateDrawTargetForBlend() + ? blender.CreateBlendTarget(aTransform) + : &aContext; + + if (!target) { + return; + } + + /* Check if we need to do additional operations on this child's + * rendering, which necessitates rendering into another surface. */ + bool shouldGenerateMask = + (maskUsage.opacity != 1.0f || maskUsage.shouldGenerateClipMaskLayer || + maskUsage.shouldGenerateMaskLayer); + bool shouldPushMask = false; + + if (shouldGenerateMask) { + RefPtr<SourceSurface> maskSurface; + + // maskFrame can be nullptr even if maskUsage.shouldGenerateMaskLayer is + // true. That happens when a user gives an unresolvable mask-id, such as + // mask:url() + // mask:url(#id-which-does-not-exist) + // Since we only uses SVGUtils with SVG elements, not like mask on an + // HTML element, we should treat an unresolvable mask as no-mask here. + if (maskUsage.shouldGenerateMaskLayer && maskFrame) { + StyleMaskMode maskMode = + aFrame->StyleSVGReset()->mMask.mLayers[0].mMaskMode; + SVGMaskFrame::MaskParams params(aContext.GetDrawTarget(), aFrame, + aTransform, maskUsage.opacity, maskMode, + aImgParams); + + maskSurface = maskFrame->GetMaskForMaskedFrame(params); + + if (!maskSurface) { + // Either entire surface is clipped out, or gfx buffer allocation + // failure in SVGMaskFrame::GetMaskForMaskedFrame. + return; + } + shouldPushMask = true; + } + + if (maskUsage.shouldGenerateClipMaskLayer) { + RefPtr<SourceSurface> clipMaskSurface = + clipPathFrame->GetClipMask(aContext, aFrame, aTransform, maskSurface); + if (clipMaskSurface) { + maskSurface = clipMaskSurface; + } else { + // Either entire surface is clipped out, or gfx buffer allocation + // failure in SVGClipPathFrame::GetClipMask. + return; + } + shouldPushMask = true; + } + + if (!maskUsage.shouldGenerateClipMaskLayer && + !maskUsage.shouldGenerateMaskLayer) { + shouldPushMask = true; + } + + // SVG mask multiply opacity into maskSurface already, so we do not bother + // to apply opacity again. + if (shouldPushMask) { + // We want the mask to be untransformed so use the inverse of the + // current transform as the maskTransform to compensate. + Matrix maskTransform = aContext.CurrentMatrix(); + maskTransform.Invert(); + target->PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, + maskFrame ? 1.0 : maskUsage.opacity, + maskSurface, maskTransform); + } + } + + /* If this frame has only a trivial clipPath, set up cairo's clipping now so + * we can just do normal painting and get it clipped appropriately. + */ + if (maskUsage.shouldApplyClipPath || maskUsage.shouldApplyBasicShapeOrPath) { + if (maskUsage.shouldApplyClipPath) { + clipPathFrame->ApplyClipPath(aContext, aFrame, aTransform); + } else { + CSSClipPathInstance::ApplyBasicShapeOrPathClip(aContext, aFrame, + aTransform); + } + } + + /* Paint the child */ + + // Invalid filters should render the unfiltered contents per spec. + if (aFrame->StyleEffects()->HasFilters() && !hasInvalidFilter) { + gfxContextMatrixAutoSaveRestore autoSR(target); + + // 'target' is currently scaled such that its user space units are CSS + // pixels (SVG user space units). But PaintFilteredFrame expects it to be + // scaled in such a way that its user space units are device pixels. So we + // have to adjust the scale. + gfxMatrix reverseScaleMatrix = SVGUtils::GetCSSPxToDevPxMatrix(aFrame); + DebugOnly<bool> invertible = reverseScaleMatrix.Invert(); + target->SetMatrixDouble(reverseScaleMatrix * aTransform * + target->CurrentMatrixDouble()); + + auto callback = [&](gfxContext& aContext, imgDrawingParams& aImgParams, + const gfxMatrix* aFilterTransform, + const nsIntRect* aDirtyRect) { + svgFrame->PaintSVG(aContext, + aFilterTransform + ? SVGUtils::GetCSSPxToDevPxMatrix(aFrame) + : aTransform, + aImgParams); + }; + FilterInstance::PaintFilteredFrame( + aFrame, aFrame->StyleEffects()->mFilters.AsSpan(), target, callback, + nullptr, aImgParams); + } else { + svgFrame->PaintSVG(*target, aTransform, aImgParams); + } + + if (maskUsage.shouldApplyClipPath || maskUsage.shouldApplyBasicShapeOrPath) { + aContext.PopClip(); + } + + if (shouldPushMask) { + target->PopGroupAndBlend(); + } + + if (blender.ShouldCreateDrawTargetForBlend()) { + MOZ_ASSERT(target != &aContext); + blender.BlendToTarget(); + } +} + +bool SVGUtils::HitTestClip(nsIFrame* aFrame, const gfxPoint& aPoint) { + const nsStyleSVGReset* svgReset = aFrame->StyleSVGReset(); + if (!svgReset->HasClipPath()) { + return true; + } + if (svgReset->mClipPath.IsUrl()) { + // If the clip-path property references non-existent or invalid clipPath + // element(s) we ignore it. + SVGClipPathFrame* clipPathFrame; + SVGObserverUtils::GetAndObserveClipPath(aFrame, &clipPathFrame); + return !clipPathFrame || + clipPathFrame->PointIsInsideClipPath(aFrame, aPoint); + } + return CSSClipPathInstance::HitTestBasicShapeOrPathClip(aFrame, aPoint); +} + +IntSize SVGUtils::ConvertToSurfaceSize(const gfxSize& aSize, + bool* aResultOverflows) { + IntSize surfaceSize(ClampToInt(ceil(aSize.width)), + ClampToInt(ceil(aSize.height))); + + *aResultOverflows = surfaceSize.width != ceil(aSize.width) || + surfaceSize.height != ceil(aSize.height); + + if (!Factory::AllowedSurfaceSize(surfaceSize)) { + surfaceSize.width = + std::min(NS_SVG_OFFSCREEN_MAX_DIMENSION, surfaceSize.width); + surfaceSize.height = + std::min(NS_SVG_OFFSCREEN_MAX_DIMENSION, surfaceSize.height); + *aResultOverflows = true; + } + + return surfaceSize; +} + +bool SVGUtils::HitTestRect(const gfx::Matrix& aMatrix, float aRX, float aRY, + float aRWidth, float aRHeight, float aX, float aY) { + gfx::Rect rect(aRX, aRY, aRWidth, aRHeight); + if (rect.IsEmpty() || aMatrix.IsSingular()) { + return false; + } + gfx::Matrix toRectSpace = aMatrix; + toRectSpace.Invert(); + gfx::Point p = toRectSpace.TransformPoint(gfx::Point(aX, aY)); + return rect.x <= p.x && p.x <= rect.XMost() && rect.y <= p.y && + p.y <= rect.YMost(); +} + +gfxRect SVGUtils::GetClipRectForFrame(const nsIFrame* aFrame, float aX, + float aY, float aWidth, float aHeight) { + const nsStyleDisplay* disp = aFrame->StyleDisplay(); + const nsStyleEffects* effects = aFrame->StyleEffects(); + + bool clipApplies = disp->mOverflowX == StyleOverflow::Hidden || + disp->mOverflowY == StyleOverflow::Hidden; + + if (!clipApplies || effects->mClip.IsAuto()) { + return gfxRect(aX, aY, aWidth, aHeight); + } + + const auto& rect = effects->mClip.AsRect(); + nsRect coordClipRect = rect.ToLayoutRect(); + nsIntRect clipPxRect = coordClipRect.ToOutsidePixels( + aFrame->PresContext()->AppUnitsPerDevPixel()); + gfxRect clipRect = + gfxRect(clipPxRect.x, clipPxRect.y, clipPxRect.width, clipPxRect.height); + if (rect.right.IsAuto()) { + clipRect.width = aWidth - clipRect.X(); + } + if (rect.bottom.IsAuto()) { + clipRect.height = aHeight - clipRect.Y(); + } + if (disp->mOverflowX != StyleOverflow::Hidden) { + clipRect.x = aX; + clipRect.width = aWidth; + } + if (disp->mOverflowY != StyleOverflow::Hidden) { + clipRect.y = aY; + clipRect.height = aHeight; + } + return clipRect; +} + +gfxRect SVGUtils::GetBBox(nsIFrame* aFrame, uint32_t aFlags, + const gfxMatrix* aToBoundsSpace) { + if (aFrame->IsTextFrame()) { + aFrame = aFrame->GetParent(); + } + + if (aFrame->IsInSVGTextSubtree()) { + // It is possible to apply a gradient, pattern, clipping path, mask or + // filter to text. When one of these facilities is applied to text + // the bounding box is the entire text element in all cases. + aFrame = + nsLayoutUtils::GetClosestFrameOfType(aFrame, LayoutFrameType::SVGText); + } + + ISVGDisplayableFrame* svg = do_QueryFrame(aFrame); + const bool hasSVGLayout = aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT); + if (hasSVGLayout && !svg) { + // An SVG frame, but not one that can be displayed directly (for + // example, nsGradientFrame). These can't contribute to the bbox. + return gfxRect(); + } + + const bool isOuterSVG = svg && !hasSVGLayout; + MOZ_ASSERT(!isOuterSVG || aFrame->IsSVGOuterSVGFrame()); + if (!svg || (isOuterSVG && (aFlags & eUseFrameBoundsForOuterSVG))) { + // An HTML element or an SVG outer frame. + MOZ_ASSERT(!hasSVGLayout); + bool onlyCurrentFrame = aFlags & eIncludeOnlyCurrentFrameForNonSVGElement; + return SVGIntegrationUtils::GetSVGBBoxForNonSVGFrame( + aFrame, + /* aUnionContinuations = */ !onlyCurrentFrame); + } + + MOZ_ASSERT(svg); + + if (auto* element = SVGElement::FromNodeOrNull(aFrame->GetContent())) { + if (!element->HasValidDimensions()) { + return gfxRect(); + } + } + + // Clean out flags which have no effects on returning bbox from now, so that + // we can cache and reuse ObjectBoundingBoxProperty() in the code below. + aFlags &= + ~(eIncludeOnlyCurrentFrameForNonSVGElement | eUseFrameBoundsForOuterSVG); + if (!aFrame->IsSVGUseFrame()) { + aFlags &= ~eUseUserSpaceOfUseElement; + } + + if (aFlags == eBBoxIncludeFillGeometry && + // We only cache bbox in element's own user space + !aToBoundsSpace) { + gfxRect* prop = aFrame->GetProperty(ObjectBoundingBoxProperty()); + if (prop) { + return *prop; + } + } + + gfxMatrix matrix; + if (aToBoundsSpace) { + matrix = *aToBoundsSpace; + } + + if (aFrame->IsSVGForeignObjectFrame() || + aFlags & SVGUtils::eUseUserSpaceOfUseElement) { + // The spec says getBBox "Returns the tight bounding box in *current user + // space*". So we should really be doing this for all elements, but that + // needs investigation to check that we won't break too much content. + // NOTE: When changing this to apply to other frame types, make sure to + // also update SVGUtils::FrameSpaceInCSSPxToUserSpaceOffset. + MOZ_ASSERT(aFrame->GetContent()->IsSVGElement(), "bad cast"); + SVGElement* element = static_cast<SVGElement*>(aFrame->GetContent()); + matrix = element->PrependLocalTransformsTo(matrix, eChildToUserSpace); + } + gfxRect bbox = + svg->GetBBoxContribution(ToMatrix(matrix), aFlags).ToThebesRect(); + // Account for 'clipped'. + if (aFlags & SVGUtils::eBBoxIncludeClipped) { + gfxRect clipRect; + float x, y, width, height; + gfxRect fillBBox = + svg->GetBBoxContribution({}, SVGUtils::eBBoxIncludeFill).ToThebesRect(); + x = fillBBox.x; + y = fillBBox.y; + width = fillBBox.width; + height = fillBBox.height; + bool hasClip = aFrame->StyleDisplay()->IsScrollableOverflow(); + if (hasClip) { + clipRect = SVGUtils::GetClipRectForFrame(aFrame, x, y, width, height); + if (aFrame->IsSVGForeignObjectFrame() || aFrame->IsSVGUseFrame()) { + clipRect = matrix.TransformBounds(clipRect); + } + } + SVGClipPathFrame* clipPathFrame; + if (SVGObserverUtils::GetAndObserveClipPath(aFrame, &clipPathFrame) == + SVGObserverUtils::eHasRefsSomeInvalid) { + bbox = gfxRect(0, 0, 0, 0); + } else { + if (clipPathFrame) { + SVGClipPathElement* clipContent = + static_cast<SVGClipPathElement*>(clipPathFrame->GetContent()); + if (clipContent->IsUnitsObjectBoundingBox()) { + matrix.PreTranslate(gfxPoint(x, y)); + matrix.PreScale(width, height); + } else if (aFrame->IsSVGForeignObjectFrame()) { + matrix = gfxMatrix(); + } + matrix *= SVGUtils::GetTransformMatrixInUserSpace(clipPathFrame); + + bbox = clipPathFrame->GetBBoxForClipPathFrame(bbox, matrix, aFlags) + .ToThebesRect(); + } + + if (hasClip) { + bbox = bbox.Intersect(clipRect); + } + + if (bbox.IsEmpty()) { + bbox = gfxRect(0, 0, 0, 0); + } + } + } + + if (aFlags == eBBoxIncludeFillGeometry && + // We only cache bbox in element's own user space + !aToBoundsSpace) { + // Obtaining the bbox for objectBoundingBox calculations is common so we + // cache the result for future calls, since calculation can be expensive: + aFrame->SetProperty(ObjectBoundingBoxProperty(), new gfxRect(bbox)); + } + + return bbox; +} + +gfxPoint SVGUtils::FrameSpaceInCSSPxToUserSpaceOffset(const nsIFrame* aFrame) { + if (!aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) { + // The user space for non-SVG frames is defined as the bounding box of the + // frame's border-box rects over all continuations. + return gfxPoint(); + } + + // Leaf frames apply their own offset inside their user space. + if (FrameDoesNotIncludePositionInTM(aFrame)) { + return nsLayoutUtils::RectToGfxRect(aFrame->GetRect(), + AppUnitsPerCSSPixel()) + .TopLeft(); + } + + // For foreignObject frames, SVGUtils::GetBBox applies their local + // transform, so we need to do the same here. + if (aFrame->IsSVGForeignObjectFrame()) { + gfxMatrix transform = + static_cast<SVGElement*>(aFrame->GetContent()) + ->PrependLocalTransformsTo(gfxMatrix(), eChildToUserSpace); + NS_ASSERTION(!transform.HasNonTranslation(), + "we're relying on this being an offset-only transform"); + return transform.GetTranslation(); + } + + return gfxPoint(); +} + +static gfxRect GetBoundingBoxRelativeRect(const SVGAnimatedLength* aXYWH, + const gfxRect& aBBox) { + return gfxRect(aBBox.x + SVGUtils::ObjectSpace(aBBox, &aXYWH[0]), + aBBox.y + SVGUtils::ObjectSpace(aBBox, &aXYWH[1]), + SVGUtils::ObjectSpace(aBBox, &aXYWH[2]), + SVGUtils::ObjectSpace(aBBox, &aXYWH[3])); +} + +gfxRect SVGUtils::GetRelativeRect(uint16_t aUnits, + const SVGAnimatedLength* aXYWH, + const gfxRect& aBBox, + const UserSpaceMetrics& aMetrics) { + if (aUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) { + return GetBoundingBoxRelativeRect(aXYWH, aBBox); + } + return gfxRect(UserSpace(aMetrics, &aXYWH[0]), UserSpace(aMetrics, &aXYWH[1]), + UserSpace(aMetrics, &aXYWH[2]), + UserSpace(aMetrics, &aXYWH[3])); +} + +gfxRect SVGUtils::GetRelativeRect(uint16_t aUnits, + const SVGAnimatedLength* aXYWH, + const gfxRect& aBBox, nsIFrame* aFrame) { + if (aUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) { + return GetBoundingBoxRelativeRect(aXYWH, aBBox); + } + if (SVGElement* svgElement = SVGElement::FromNode(aFrame->GetContent())) { + return GetRelativeRect(aUnits, aXYWH, aBBox, SVGElementMetrics(svgElement)); + } + return GetRelativeRect(aUnits, aXYWH, aBBox, + NonSVGFrameUserSpaceMetrics(aFrame)); +} + +bool SVGUtils::CanOptimizeOpacity(const nsIFrame* aFrame) { + if (!aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) { + return false; + } + auto* content = aFrame->GetContent(); + if (!content->IsSVGGeometryElement() && + !content->IsSVGElement(nsGkAtoms::image)) { + return false; + } + if (aFrame->StyleEffects()->HasFilters()) { + return false; + } + // XXX The SVG WG is intending to allow fill, stroke and markers on <image> + if (content->IsSVGElement(nsGkAtoms::image)) { + return true; + } + const nsStyleSVG* style = aFrame->StyleSVG(); + if (style->HasMarker() && + static_cast<SVGGeometryElement*>(content)->IsMarkable()) { + return false; + } + + if (nsLayoutUtils::HasAnimationOfPropertySet( + aFrame, nsCSSPropertyIDSet::OpacityProperties())) { + return false; + } + + return !style->HasFill() || !HasStroke(aFrame); +} + +gfxMatrix SVGUtils::AdjustMatrixForUnits(const gfxMatrix& aMatrix, + const SVGAnimatedEnumeration* aUnits, + nsIFrame* aFrame, uint32_t aFlags) { + if (aFrame && aUnits->GetAnimValue() == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) { + gfxRect bbox = GetBBox(aFrame, aFlags); + gfxMatrix tm = aMatrix; + tm.PreTranslate(gfxPoint(bbox.X(), bbox.Y())); + tm.PreScale(bbox.Width(), bbox.Height()); + return tm; + } + return aMatrix; +} + +bool SVGUtils::GetNonScalingStrokeTransform(const nsIFrame* aFrame, + gfxMatrix* aUserToOuterSVG) { + if (aFrame->GetContent()->IsText()) { + aFrame = aFrame->GetParent(); + } + + if (!aFrame->StyleSVGReset()->HasNonScalingStroke()) { + return false; + } + + MOZ_ASSERT(aFrame->GetContent()->IsSVGElement(), "should be an SVG element"); + + *aUserToOuterSVG = ThebesMatrix(SVGContentUtils::GetCTM( + static_cast<SVGElement*>(aFrame->GetContent()), true)); + + return aUserToOuterSVG->HasNonTranslation(); +} + +// The logic here comes from _cairo_stroke_style_max_distance_from_path +static gfxRect PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents, + const nsIFrame* aFrame, + double aStyleExpansionFactor, + const gfxMatrix& aMatrix) { + double style_expansion = + aStyleExpansionFactor * SVGUtils::GetStrokeWidth(aFrame); + + gfxMatrix matrix = aMatrix; + + gfxMatrix outerSVGToUser; + if (SVGUtils::GetNonScalingStrokeTransform(aFrame, &outerSVGToUser)) { + outerSVGToUser.Invert(); + matrix.PreMultiply(outerSVGToUser); + } + + double dx = style_expansion * (fabs(matrix._11) + fabs(matrix._21)); + double dy = style_expansion * (fabs(matrix._22) + fabs(matrix._12)); + + gfxRect strokeExtents = aPathExtents; + strokeExtents.Inflate(dx, dy); + return strokeExtents; +} + +/*static*/ +gfxRect SVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents, + const nsTextFrame* aFrame, + const gfxMatrix& aMatrix) { + NS_ASSERTION(aFrame->IsInSVGTextSubtree(), + "expected an nsTextFrame for SVG text"); + return mozilla::PathExtentsToMaxStrokeExtents(aPathExtents, aFrame, 0.5, + aMatrix); +} + +/*static*/ +gfxRect SVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents, + const SVGGeometryFrame* aFrame, + const gfxMatrix& aMatrix) { + bool strokeMayHaveCorners = + !SVGContentUtils::ShapeTypeHasNoCorners(aFrame->GetContent()); + + // For a shape without corners the stroke can only extend half the stroke + // width from the path in the x/y-axis directions. For shapes with corners + // the stroke can extend by sqrt(1/2) (think 45 degree rotated rect, or line + // with stroke-linecaps="square"). + double styleExpansionFactor = strokeMayHaveCorners ? M_SQRT1_2 : 0.5; + + // The stroke can extend even further for paths that can be affected by + // stroke-miterlimit. + // We only need to do this if the limit is greater than 1, but it's probably + // not worth optimizing for that. + bool affectedByMiterlimit = aFrame->GetContent()->IsAnyOfSVGElements( + nsGkAtoms::path, nsGkAtoms::polyline, nsGkAtoms::polygon); + + if (affectedByMiterlimit) { + const nsStyleSVG* style = aFrame->StyleSVG(); + if (style->mStrokeLinejoin == StyleStrokeLinejoin::Miter && + styleExpansionFactor < style->mStrokeMiterlimit / 2.0) { + styleExpansionFactor = style->mStrokeMiterlimit / 2.0; + } + } + + return mozilla::PathExtentsToMaxStrokeExtents(aPathExtents, aFrame, + styleExpansionFactor, aMatrix); +} + +// ---------------------------------------------------------------------- + +/* static */ +nscolor SVGUtils::GetFallbackOrPaintColor( + const ComputedStyle& aStyle, StyleSVGPaint nsStyleSVG::*aFillOrStroke, + nscolor aDefaultContextFallbackColor) { + const auto& paint = aStyle.StyleSVG()->*aFillOrStroke; + nscolor color; + switch (paint.kind.tag) { + case StyleSVGPaintKind::Tag::PaintServer: + color = paint.fallback.IsColor() + ? paint.fallback.AsColor().CalcColor(aStyle) + : NS_RGBA(0, 0, 0, 0); + break; + case StyleSVGPaintKind::Tag::ContextStroke: + case StyleSVGPaintKind::Tag::ContextFill: + color = paint.fallback.IsColor() + ? paint.fallback.AsColor().CalcColor(aStyle) + : aDefaultContextFallbackColor; + break; + default: + color = paint.kind.AsColor().CalcColor(aStyle); + break; + } + if (const auto* styleIfVisited = aStyle.GetStyleIfVisited()) { + const auto& paintIfVisited = styleIfVisited->StyleSVG()->*aFillOrStroke; + // To prevent Web content from detecting if a user has visited a URL + // (via URL loading triggered by paint servers or performance + // differences between paint servers or between a paint server and a + // color), we do not allow whether links are visited to change which + // paint server is used or switch between paint servers and simple + // colors. A :visited style may only override a simple color with + // another simple color. + if (paintIfVisited.kind.IsColor() && paint.kind.IsColor()) { + nscolor colors[2] = { + color, paintIfVisited.kind.AsColor().CalcColor(*styleIfVisited)}; + return ComputedStyle::CombineVisitedColors(colors, + aStyle.RelevantLinkVisited()); + } + } + return color; +} + +/* static */ +void SVGUtils::MakeFillPatternFor(nsIFrame* aFrame, gfxContext* aContext, + GeneralPattern* aOutPattern, + imgDrawingParams& aImgParams, + SVGContextPaint* aContextPaint) { + const nsStyleSVG* style = aFrame->StyleSVG(); + if (style->mFill.kind.IsNone()) { + return; + } + + const auto* styleEffects = aFrame->StyleEffects(); + + float fillOpacity = GetOpacity(style->mFillOpacity, aContextPaint); + if (!styleEffects->IsOpaque() && SVGUtils::CanOptimizeOpacity(aFrame)) { + // Combine the group opacity into the fill opacity (we will have skipped + // creating an offscreen surface to apply the group opacity). + fillOpacity *= styleEffects->mOpacity; + } + + const DrawTarget* dt = aContext->GetDrawTarget(); + + SVGPaintServerFrame* ps = + SVGObserverUtils::GetAndObservePaintServer(aFrame, &nsStyleSVG::mFill); + + if (ps) { + RefPtr<gfxPattern> pattern = + ps->GetPaintServerPattern(aFrame, dt, aContext->CurrentMatrixDouble(), + &nsStyleSVG::mFill, fillOpacity, aImgParams); + if (pattern) { + pattern->CacheColorStops(dt); + aOutPattern->Init(*pattern->GetPattern(dt)); + return; + } + } + + if (aContextPaint) { + RefPtr<gfxPattern> pattern; + switch (style->mFill.kind.tag) { + case StyleSVGPaintKind::Tag::ContextFill: + pattern = aContextPaint->GetFillPattern( + dt, fillOpacity, aContext->CurrentMatrixDouble(), aImgParams); + break; + case StyleSVGPaintKind::Tag::ContextStroke: + pattern = aContextPaint->GetStrokePattern( + dt, fillOpacity, aContext->CurrentMatrixDouble(), aImgParams); + break; + default:; + } + if (pattern) { + aOutPattern->Init(*pattern->GetPattern(dt)); + return; + } + } + + if (style->mFill.fallback.IsNone()) { + return; + } + + // On failure, use the fallback colour in case we have an + // objectBoundingBox where the width or height of the object is zero. + // See http://www.w3.org/TR/SVG11/coords.html#ObjectBoundingBox + sRGBColor color(sRGBColor::FromABGR(GetFallbackOrPaintColor( + *aFrame->Style(), &nsStyleSVG::mFill, NS_RGB(0, 0, 0)))); + color.a *= fillOpacity; + aOutPattern->InitColorPattern(ToDeviceColor(color)); +} + +/* static */ +void SVGUtils::MakeStrokePatternFor(nsIFrame* aFrame, gfxContext* aContext, + GeneralPattern* aOutPattern, + imgDrawingParams& aImgParams, + SVGContextPaint* aContextPaint) { + const nsStyleSVG* style = aFrame->StyleSVG(); + if (style->mStroke.kind.IsNone()) { + return; + } + + const auto* styleEffects = aFrame->StyleEffects(); + + float strokeOpacity = GetOpacity(style->mStrokeOpacity, aContextPaint); + if (!styleEffects->IsOpaque() && SVGUtils::CanOptimizeOpacity(aFrame)) { + // Combine the group opacity into the stroke opacity (we will have skipped + // creating an offscreen surface to apply the group opacity). + strokeOpacity *= styleEffects->mOpacity; + } + + const DrawTarget* dt = aContext->GetDrawTarget(); + + SVGPaintServerFrame* ps = + SVGObserverUtils::GetAndObservePaintServer(aFrame, &nsStyleSVG::mStroke); + + if (ps) { + RefPtr<gfxPattern> pattern = ps->GetPaintServerPattern( + aFrame, dt, aContext->CurrentMatrixDouble(), &nsStyleSVG::mStroke, + strokeOpacity, aImgParams); + if (pattern) { + pattern->CacheColorStops(dt); + aOutPattern->Init(*pattern->GetPattern(dt)); + return; + } + } + + if (aContextPaint) { + RefPtr<gfxPattern> pattern; + switch (style->mStroke.kind.tag) { + case StyleSVGPaintKind::Tag::ContextFill: + pattern = aContextPaint->GetFillPattern( + dt, strokeOpacity, aContext->CurrentMatrixDouble(), aImgParams); + break; + case StyleSVGPaintKind::Tag::ContextStroke: + pattern = aContextPaint->GetStrokePattern( + dt, strokeOpacity, aContext->CurrentMatrixDouble(), aImgParams); + break; + default:; + } + if (pattern) { + aOutPattern->Init(*pattern->GetPattern(dt)); + return; + } + } + + if (style->mStroke.fallback.IsNone()) { + return; + } + + // On failure, use the fallback colour in case we have an + // objectBoundingBox where the width or height of the object is zero. + // See http://www.w3.org/TR/SVG11/coords.html#ObjectBoundingBox + sRGBColor color(sRGBColor::FromABGR(GetFallbackOrPaintColor( + *aFrame->Style(), &nsStyleSVG::mStroke, NS_RGBA(0, 0, 0, 0)))); + color.a *= strokeOpacity; + aOutPattern->InitColorPattern(ToDeviceColor(color)); +} + +/* static */ +float SVGUtils::GetOpacity(const StyleSVGOpacity& aOpacity, + const SVGContextPaint* aContextPaint) { + float opacity = 1.0f; + switch (aOpacity.tag) { + case StyleSVGOpacity::Tag::Opacity: + return aOpacity.AsOpacity(); + case StyleSVGOpacity::Tag::ContextFillOpacity: + if (aContextPaint) { + opacity = aContextPaint->GetFillOpacity(); + } + break; + case StyleSVGOpacity::Tag::ContextStrokeOpacity: + if (aContextPaint) { + opacity = aContextPaint->GetStrokeOpacity(); + } + break; + } + return opacity; +} + +bool SVGUtils::HasStroke(const nsIFrame* aFrame, + const SVGContextPaint* aContextPaint) { + const nsStyleSVG* style = aFrame->StyleSVG(); + return style->HasStroke() && GetStrokeWidth(aFrame, aContextPaint) > 0; +} + +float SVGUtils::GetStrokeWidth(const nsIFrame* aFrame, + const SVGContextPaint* aContextPaint) { + nsIContent* content = aFrame->GetContent(); + if (content->IsText()) { + content = content->GetParent(); + } + + auto* ctx = SVGElement::FromNode(content); + return SVGContentUtils::GetStrokeWidth(ctx, aFrame->Style(), aContextPaint); +} + +void SVGUtils::SetupStrokeGeometry(nsIFrame* aFrame, gfxContext* aContext, + SVGContextPaint* aContextPaint) { + MOZ_ASSERT(aFrame->GetContent()->IsSVGElement(), "bad cast"); + SVGContentUtils::AutoStrokeOptions strokeOptions; + SVGContentUtils::GetStrokeOptions(&strokeOptions, + SVGElement::FromNode(aFrame->GetContent()), + aFrame->Style(), aContextPaint); + + if (strokeOptions.mLineWidth <= 0) { + return; + } + + // SVGContentUtils::GetStrokeOptions gets the stroke options in CSS px; + // convert to device pixels for gfxContext. + float devPxPerCSSPx = aFrame->PresContext()->CSSToDevPixelScale().scale; + + aContext->SetLineWidth(strokeOptions.mLineWidth * devPxPerCSSPx); + aContext->SetLineCap(strokeOptions.mLineCap); + aContext->SetMiterLimit(strokeOptions.mMiterLimit); + aContext->SetLineJoin(strokeOptions.mLineJoin); + aContext->SetDash(strokeOptions.mDashPattern, strokeOptions.mDashLength, + strokeOptions.mDashOffset, devPxPerCSSPx); +} + +uint16_t SVGUtils::GetGeometryHitTestFlags(const nsIFrame* aFrame) { + uint16_t flags = 0; + + switch (aFrame->Style()->PointerEvents()) { + case StylePointerEvents::None: + break; + case StylePointerEvents::Auto: + case StylePointerEvents::Visiblepainted: + if (aFrame->StyleVisibility()->IsVisible()) { + if (!aFrame->StyleSVG()->mFill.kind.IsNone()) { + flags = SVG_HIT_TEST_FILL; + } + if (!aFrame->StyleSVG()->mStroke.kind.IsNone()) { + flags |= SVG_HIT_TEST_STROKE; + } + } + break; + case StylePointerEvents::Visiblefill: + if (aFrame->StyleVisibility()->IsVisible()) { + flags = SVG_HIT_TEST_FILL; + } + break; + case StylePointerEvents::Visiblestroke: + if (aFrame->StyleVisibility()->IsVisible()) { + flags = SVG_HIT_TEST_STROKE; + } + break; + case StylePointerEvents::Visible: + if (aFrame->StyleVisibility()->IsVisible()) { + flags = SVG_HIT_TEST_FILL | SVG_HIT_TEST_STROKE; + } + break; + case StylePointerEvents::Painted: + if (!aFrame->StyleSVG()->mFill.kind.IsNone()) { + flags = SVG_HIT_TEST_FILL; + } + if (!aFrame->StyleSVG()->mStroke.kind.IsNone()) { + flags |= SVG_HIT_TEST_STROKE; + } + break; + case StylePointerEvents::Fill: + flags = SVG_HIT_TEST_FILL; + break; + case StylePointerEvents::Stroke: + flags = SVG_HIT_TEST_STROKE; + break; + case StylePointerEvents::All: + flags = SVG_HIT_TEST_FILL | SVG_HIT_TEST_STROKE; + break; + default: + NS_ERROR("not reached"); + break; + } + + return flags; +} + +void SVGUtils::PaintSVGGlyph(Element* aElement, gfxContext* aContext) { + nsIFrame* frame = aElement->GetPrimaryFrame(); + ISVGDisplayableFrame* svgFrame = do_QueryFrame(frame); + if (!svgFrame) { + return; + } + gfxMatrix m; + if (frame->GetContent()->IsSVGElement()) { + // PaintSVG() expects the passed transform to be the transform to its own + // SVG user space, so we need to account for any 'transform' attribute: + m = SVGUtils::GetTransformMatrixInUserSpace(frame); + } + + // SVG-in-OpenType is not allowed to paint external resources, so we can + // just pass a dummy params into PatintSVG. + imgDrawingParams dummy; + svgFrame->PaintSVG(*aContext, m, dummy); +} + +bool SVGUtils::GetSVGGlyphExtents(const Element* aElement, + const gfxMatrix& aSVGToAppSpace, + gfxRect* aResult) { + nsIFrame* frame = aElement->GetPrimaryFrame(); + ISVGDisplayableFrame* svgFrame = do_QueryFrame(frame); + if (!svgFrame) { + return false; + } + + gfxMatrix transform(aSVGToAppSpace); + if (auto* svg = SVGElement::FromNode(frame->GetContent())) { + transform = svg->PrependLocalTransformsTo(aSVGToAppSpace); + } + + *aResult = + svgFrame + ->GetBBoxContribution(gfx::ToMatrix(transform), + SVGUtils::eBBoxIncludeFill | + SVGUtils::eBBoxIncludeFillGeometry | + SVGUtils::eBBoxIncludeStroke | + SVGUtils::eBBoxIncludeStrokeGeometry | + SVGUtils::eBBoxIncludeMarkers) + .ToThebesRect(); + return true; +} + +nsRect SVGUtils::ToCanvasBounds(const gfxRect& aUserspaceRect, + const gfxMatrix& aToCanvas, + const nsPresContext* presContext) { + return nsLayoutUtils::RoundGfxRectToAppRect( + aToCanvas.TransformBounds(aUserspaceRect), + presContext->AppUnitsPerDevPixel()); +} + +gfxMatrix SVGUtils::GetCSSPxToDevPxMatrix(const nsIFrame* aNonSVGFrame) { + float devPxPerCSSPx = aNonSVGFrame->PresContext()->CSSToDevPixelScale().scale; + + return gfxMatrix(devPxPerCSSPx, 0.0, 0.0, devPxPerCSSPx, 0.0, 0.0); +} + +gfxMatrix SVGUtils::GetTransformMatrixInUserSpace(const nsIFrame* aFrame) { + // We check element instead of aFrame directly because SVG element + // may have non-SVG frame, <tspan> for example. + MOZ_ASSERT(aFrame->GetContent() && aFrame->GetContent()->IsSVGElement(), + "Only use this wrapper for SVG elements"); + + if (!aFrame->IsTransformed()) { + return {}; + } + + nsStyleTransformMatrix::TransformReferenceBox refBox(aFrame); + nsDisplayTransform::FrameTransformProperties properties{ + aFrame, refBox, AppUnitsPerCSSPixel()}; + + // SVG elements can have x/y offset, their default transform origin + // is the origin of user space, not the top left point of the frame. + Point3D svgTransformOrigin{ + properties.mToTransformOrigin.x - CSSPixel::FromAppUnits(refBox.X()), + properties.mToTransformOrigin.y - CSSPixel::FromAppUnits(refBox.Y()), + properties.mToTransformOrigin.z}; + + Matrix svgTransform; + Matrix4x4 trans; + (void)aFrame->IsSVGTransformed(&svgTransform); + + if (properties.HasTransform()) { + trans = nsStyleTransformMatrix::ReadTransforms( + properties.mTranslate, properties.mRotate, properties.mScale, + properties.mMotion, properties.mTransform, refBox, + AppUnitsPerCSSPixel()); + } else { + trans = Matrix4x4::From2D(svgTransform); + } + + trans.ChangeBasis(svgTransformOrigin); + + Matrix mm; + trans.ProjectTo2D(); + (void)trans.CanDraw2D(&mm); + + return ThebesMatrix(mm); +} + +} // namespace mozilla |