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fune/layout/svg/SVGUtils.cpp
longsonr 17abb2b7e9 Bug 1691659 - don't re-enter ScheduleReflowSVG r=emilio 
The testcase in the bug does assert under a debug Firefox here: https://searchfox.org/mozilla-central/source/layout/svg/SVGUtils.cpp#156 presumably fuzz testing has not uncovered this because of the mouse over part. I don't know how to write an automated test for this.

Note that scheduling a reflow will cause a repaint especially as we're setting state bits so we don't need to do a paint notify too.

Differential Revision: https://phabricator.services.mozilla.com/D104564
2021-02-13 07:45:31 +00:00

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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/. */
// 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 "SVGFilterPaintCallback.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_SVGDisplayListHitTestingEnabled() {
return mozilla::StaticPrefs::svg_display_lists_hit_testing_enabled();
}
bool NS_SVGDisplayListPaintingEnabled() {
return mozilla::StaticPrefs::svg_display_lists_painting_enabled();
}
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;
}
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);
}
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::Resize,
dirtyBit);
}
bool SVGUtils::NeedsReflowSVG(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) {
return aLength->GetAnimValue(aNonSVGContext);
}
float SVGUtils::UserSpace(const UserSpaceMetrics& aMetrics,
const SVGAnimatedLength* aLength) {
return aLength->GetAnimValue(aMetrics);
}
SVGOuterSVGFrame* SVGUtils::GetOuterSVGFrame(nsIFrame* aFrame) {
while (aFrame) {
if (aFrame->IsSVGOuterSVGFrame()) {
return static_cast<SVGOuterSVGFrame*>(aFrame);
}
aFrame = aFrame->GetParent();
}
return nullptr;
}
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;
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->IsFrameOfType(nsIFrame::eSVG)) {
return GetCSSPxToDevPxMatrix(aFrame);
}
LayoutFrameType type = aFrame->Type();
if (type == LayoutFrameType::SVGForeignObject) {
return static_cast<SVGForeignObjectFrame*>(aFrame)->GetCanvasTM();
}
if (type == LayoutFrameType::SVGOuterSVG) {
return GetCSSPxToDevPxMatrix(aFrame);
}
SVGContainerFrame* containerFrame = do_QueryFrame(aFrame);
if (containerFrame) {
return containerFrame->GetCanvasTM();
}
return static_cast<SVGGeometryFrame*>(aFrame)->GetCanvasTM();
}
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) ||
SVGUtils::IsInSVGTextSubtree(kid),
"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);
}
}
}
}
// ************************************************************
class SVGPaintCallback : public SVGFilterPaintCallback {
public:
virtual void Paint(gfxContext& aContext, nsIFrame* aTarget,
const gfxMatrix& aTransform, const nsIntRect* aDirtyRect,
imgDrawingParams& aImgParams) override {
ISVGDisplayableFrame* svgFrame = do_QueryFrame(aTarget);
NS_ASSERTION(svgFrame, "Expected SVG frame here");
nsIntRect* dirtyRect = nullptr;
nsIntRect tmpDirtyRect;
// aDirtyRect is in user-space pixels, we need to convert to
// outer-SVG-frame-relative device pixels.
if (aDirtyRect) {
gfxMatrix userToDeviceSpace = aTransform;
if (userToDeviceSpace.IsSingular()) {
return;
}
gfxRect dirtyBounds = userToDeviceSpace.TransformBounds(gfxRect(
aDirtyRect->x, aDirtyRect->y, aDirtyRect->width, aDirtyRect->height));
dirtyBounds.RoundOut();
if (gfxUtils::GfxRectToIntRect(dirtyBounds, &tmpDirtyRect)) {
dirtyRect = &tmpDirtyRect;
}
}
svgFrame->PaintSVG(aContext, SVGUtils::GetCSSPxToDevPxMatrix(aTarget),
aImgParams, dirtyRect);
}
};
float SVGUtils::ComputeOpacity(nsIFrame* aFrame, bool aHandleOpacity) {
float opacity = aFrame->StyleEffects()->mOpacity;
if (opacity != 1.0f &&
(SVGUtils::CanOptimizeOpacity(aFrame) || !aHandleOpacity)) {
return 1.0f;
}
return opacity;
}
void SVGUtils::DetermineMaskUsage(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()->mMixBlendMode != StyleBlend::Normal;
}
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);
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;
}
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(mSourceCtx);
if (!mFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
// 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 (mFrame->IsSVGGeometryFrameOrSubclass() ||
SVGUtils::IsInSVGTextSubtree(mFrame)) {
// Unlike containers, leaf frames do not include GetPosition() in
// GetCanvasTM().
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;
RefPtr<gfxContext> mTargetCtx;
IntPoint mTargetOffset;
};
void SVGUtils::PaintFrameWithEffects(nsIFrame* aFrame, gfxContext& aContext,
const gfxMatrix& aTransform,
imgDrawingParams& aImgParams,
const nsIntRect* aDirtyRect) {
NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
aFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY) ||
aFrame->PresContext()->Document()->IsSVGGlyphsDocument(),
"If display lists are enabled, 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;
}
const nsIContent* content = aFrame->GetContent();
if (content->IsSVGElement() &&
!static_cast<const SVGElement*>(content)->HasValidDimensions()) {
return;
}
if (aDirtyRect && !aFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
// Here we convert aFrame's paint bounds to outer-<svg> device space,
// compare it to aDirtyRect, and return early if they don't intersect.
// We don't do this optimization for nondisplay SVG since nondisplay
// SVG doesn't maintain bounds/overflow rects.
nsRect overflowRect = aFrame->InkOverflowRectRelativeToSelf();
if (aFrame->IsSVGGeometryFrameOrSubclass() ||
SVGUtils::IsInSVGTextSubtree(aFrame)) {
// Unlike containers, leaf frames do not include GetPosition() in
// GetCanvasTM().
overflowRect = overflowRect + aFrame->GetPosition();
}
int32_t appUnitsPerDevPx = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxMatrix tm = aTransform;
if (aFrame->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer)) {
gfx::Matrix childrenOnlyTM;
if (static_cast<SVGContainerFrame*>(aFrame)->HasChildrenOnlyTransform(
&childrenOnlyTM)) {
// Undo the children-only transform:
if (!childrenOnlyTM.Invert()) {
return;
}
tm = ThebesMatrix(childrenOnlyTM) * tm;
}
}
nsIntRect bounds =
TransformFrameRectToOuterSVG(overflowRect, tm, aFrame->PresContext())
.ToOutsidePixels(appUnitsPerDevPx);
if (!aDirtyRect->Intersects(bounds)) {
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).
*f
* + 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.
if (SVGObserverUtils::GetAndObserveFilters(aFrame, nullptr) ==
SVGObserverUtils::eHasRefsSomeInvalid ||
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) {
Matrix maskTransform;
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, aFrame, aTransform,
maskUsage.opacity, maskMode, aImgParams);
// We want the mask to be untransformed so use the inverse of the current
// transform as the maskTransform to compensate.
maskTransform = aContext.CurrentMatrix();
maskTransform.Invert();
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, maskTransform);
if (clipMaskSurface) {
// We want the mask to be untransformed so use the inverse of the
// current transform as the maskTransform to compensate.
maskTransform = aContext.CurrentMatrix();
maskTransform.Invert();
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) {
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 */
// We know we don't have eHasRefsSomeInvalid due to the check above. We
// don't test for eHasNoRefs here though since even if we have that we may
// still have CSS filter functions to handle. We have to check the style.
if (aFrame->StyleEffects()->HasFilters()) {
nsRegion* dirtyRegion = nullptr;
nsRegion tmpDirtyRegion;
if (aDirtyRect) {
// aDirtyRect is in outer-<svg> device pixels, but the filter code needs
// it in frame space.
gfxMatrix userToDeviceSpace = aTransform;
if (userToDeviceSpace.IsSingular()) {
return;
}
gfxMatrix deviceToUserSpace = userToDeviceSpace;
deviceToUserSpace.Invert();
gfxRect dirtyBounds = deviceToUserSpace.TransformBounds(gfxRect(
aDirtyRect->x, aDirtyRect->y, aDirtyRect->width, aDirtyRect->height));
tmpDirtyRegion = nsLayoutUtils::RoundGfxRectToAppRect(
dirtyBounds, AppUnitsPerCSSPixel()) -
aFrame->GetPosition();
dirtyRegion = &tmpDirtyRegion;
}
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());
SVGPaintCallback paintCallback;
FilterInstance::PaintFilteredFrame(aFrame, target, &paintCallback,
dirtyRegion, aImgParams);
} else {
svgFrame->PaintSVG(*target, aTransform, aImgParams, aDirtyRect);
}
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) {
// If the clip-path property references non-existent or invalid clipPath
// element(s) we ignore it.
SVGClipPathFrame* clipPathFrame;
SVGObserverUtils::GetAndObserveClipPath(aFrame, &clipPathFrame);
if (clipPathFrame) {
return clipPathFrame->PointIsInsideClipPath(aFrame, aPoint);
}
if (aFrame->StyleSVGReset()->HasClipPath()) {
return CSSClipPathInstance::HitTestBasicShapeOrPathClip(aFrame, aPoint);
}
return true;
}
nsIFrame* SVGUtils::HitTestChildren(SVGDisplayContainerFrame* aFrame,
const gfxPoint& aPoint) {
// First we transform aPoint into the coordinate space established by aFrame
// for its children (e.g. take account of any 'viewBox' attribute):
gfxPoint point = aPoint;
if (aFrame->GetContent()->IsSVGElement()) { // must check before cast
gfxMatrix m =
static_cast<const SVGElement*>(aFrame->GetContent())
->PrependLocalTransformsTo(gfxMatrix(), eChildToUserSpace);
if (!m.IsIdentity()) {
if (!m.Invert()) {
return nullptr;
}
point = m.TransformPoint(point);
}
}
// Traverse the list in reverse order, so that if we get a hit we know that's
// the topmost frame that intersects the point; then we can just return it.
nsIFrame* result = nullptr;
for (nsIFrame* current = aFrame->PrincipalChildList().LastChild(); current;
current = current->GetPrevSibling()) {
ISVGDisplayableFrame* SVGFrame = do_QueryFrame(current);
if (SVGFrame) {
const nsIContent* content = current->GetContent();
if (content->IsSVGElement() &&
!static_cast<const SVGElement*>(content)->HasValidDimensions()) {
continue;
}
// GetFrameForPoint() expects a point in its frame's SVG user space, so
// we need to convert to that space:
gfxPoint p = point;
if (content->IsSVGElement()) { // must check before cast
gfxMatrix m =
static_cast<const SVGElement*>(content)->PrependLocalTransformsTo(
gfxMatrix(), eUserSpaceToParent);
if (!m.IsIdentity()) {
if (!m.Invert()) {
continue;
}
p = m.TransformPoint(p);
}
}
result = SVGFrame->GetFrameForPoint(p);
if (result) break;
}
}
if (result && !HitTestClip(aFrame, aPoint)) result = nullptr;
return result;
}
nsRect SVGUtils::TransformFrameRectToOuterSVG(const nsRect& aRect,
const gfxMatrix& aMatrix,
nsPresContext* aPresContext) {
gfxRect r(aRect.x, aRect.y, aRect.width, aRect.height);
r.Scale(1.0 / AppUnitsPerCSSPixel());
return nsLayoutUtils::RoundGfxRectToAppRect(
aMatrix.TransformBounds(r), aPresContext->AppUnitsPerDevPixel());
}
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(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;
}
void SVGUtils::SetClipRect(gfxContext* aContext, const gfxMatrix& aCTM,
const gfxRect& aRect) {
if (aCTM.IsSingular()) {
return;
}
gfxContextMatrixAutoSaveRestore matrixAutoSaveRestore(aContext);
aContext->Multiply(aCTM);
aContext->Clip(aRect);
}
gfxRect SVGUtils::GetBBox(nsIFrame* aFrame, uint32_t aFlags,
const gfxMatrix* aToBoundsSpace) {
if (aFrame->IsTextFrame()) {
aFrame = aFrame->GetParent();
}
if (SVGUtils::IsInSVGTextSubtree(aFrame)) {
// 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.
nsIFrame* ancestor = GetFirstNonAAncestorFrame(aFrame);
if (ancestor && SVGUtils::IsInSVGTextSubtree(ancestor)) {
while (!ancestor->IsSVGTextFrame()) {
ancestor = ancestor->GetParent();
}
}
aFrame = ancestor;
}
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;
aFlags &= ~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(0, 0, 0, 0);
float x, y, width, height;
gfxMatrix tm;
gfxRect fillBBox =
svg->GetBBoxContribution(ToMatrix(tm), 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) * matrix;
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(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 (aFrame->IsSVGGeometryFrameOrSubclass() ||
SVGUtils::IsInSVGTextSubtree(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);
}
nsIContent* content = aFrame->GetContent();
if (content->IsSVGElement()) {
SVGElement* svgElement = static_cast<SVGElement*>(content);
return GetRelativeRect(aUnits, aXYWH, aBBox, SVGElementMetrics(svgElement));
}
return GetRelativeRect(aUnits, aXYWH, aBBox,
NonSVGFrameUserSpaceMetrics(aFrame));
}
bool SVGUtils::CanOptimizeOpacity(nsIFrame* aFrame) {
if (!aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
return false;
}
LayoutFrameType type = aFrame->Type();
if (type != LayoutFrameType::SVGImage &&
type != LayoutFrameType::SVGGeometry) {
return false;
}
if (aFrame->StyleEffects()->HasFilters()) {
return false;
}
// XXX The SVG WG is intending to allow fill, stroke and markers on <image>
if (type == LayoutFrameType::SVGImage) {
return true;
}
const nsStyleSVG* style = aFrame->StyleSVG();
if (style->HasMarker()) {
return false;
}
if (nsLayoutUtils::HasAnimationOfPropertySet(
aFrame, nsCSSPropertyIDSet::OpacityProperties())) {
return false;
}
return !style->HasFill() || !HasStroke(aFrame);
}
gfxMatrix SVGUtils::AdjustMatrixForUnits(const gfxMatrix& aMatrix,
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;
}
nsIFrame* SVGUtils::GetFirstNonAAncestorFrame(nsIFrame* aStartFrame) {
for (nsIFrame* ancestorFrame = aStartFrame; ancestorFrame;
ancestorFrame = ancestorFrame->GetParent()) {
if (!ancestorFrame->IsSVGAFrame()) {
return ancestorFrame;
}
}
return nullptr;
}
bool SVGUtils::GetNonScalingStrokeTransform(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,
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,
nsTextFrame* aFrame,
const gfxMatrix& aMatrix) {
NS_ASSERTION(SVGUtils::IsInSVGTextSubtree(aFrame),
"expected an nsTextFrame for SVG text");
return mozilla::PathExtentsToMaxStrokeExtents(aPathExtents, aFrame, 0.5,
aMatrix);
}
/*static*/
gfxRect SVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
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) {
const auto& paint = aStyle.StyleSVG()->*aFillOrStroke;
nscolor color;
switch (paint.kind.tag) {
case StyleSVGPaintKind::Tag::PaintServer:
case StyleSVGPaintKind::Tag::ContextStroke:
color = paint.fallback.IsColor()
? paint.fallback.AsColor().CalcColor(aStyle)
: NS_RGBA(0, 0, 0, 0);
break;
case StyleSVGPaintKind::Tag::ContextFill:
color = paint.fallback.IsColor()
? paint.fallback.AsColor().CalcColor(aStyle)
: NS_RGB(0, 0, 0);
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 float opacity = aFrame->StyleEffects()->mOpacity;
float fillOpacity = GetOpacity(style->mFillOpacity, aContextPaint);
if (opacity < 1.0f && 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 *= opacity;
}
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)));
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 float opacity = aFrame->StyleEffects()->mOpacity;
float strokeOpacity = GetOpacity(style->mStrokeOpacity, aContextPaint);
if (opacity < 1.0f && 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 *= opacity;
}
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)));
color.a *= strokeOpacity;
aOutPattern->InitColorPattern(ToDeviceColor(color));
}
/* static */
float SVGUtils::GetOpacity(const StyleSVGOpacity& aOpacity,
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(nsIFrame* aFrame, SVGContextPaint* aContextPaint) {
const nsStyleSVG* style = aFrame->StyleSVG();
return style->HasStroke() && GetStrokeWidth(aFrame, aContextPaint) > 0;
}
float SVGUtils::GetStrokeWidth(nsIFrame* aFrame,
SVGContextPaint* aContextPaint) {
const nsStyleSVG* style = aFrame->StyleSVG();
if (style->mStrokeWidth.IsContextValue()) {
return aContextPaint ? aContextPaint->GetStrokeWidth() : 1.0f;
}
nsIContent* content = aFrame->GetContent();
if (content->IsText()) {
content = content->GetParent();
}
SVGElement* ctx = static_cast<SVGElement*>(content);
return SVGContentUtils::CoordToFloat(
ctx, style->mStrokeWidth.AsLengthPercentage());
}
void SVGUtils::SetupStrokeGeometry(nsIFrame* aFrame, gfxContext* aContext,
SVGContextPaint* aContextPaint) {
SVGContentUtils::AutoStrokeOptions strokeOptions;
SVGContentUtils::GetStrokeOptions(
&strokeOptions, static_cast<SVGElement*>(aFrame->GetContent()),
aFrame->Style(), aContextPaint);
if (strokeOptions.mLineWidth <= 0) {
return;
}
aContext->SetLineWidth(strokeOptions.mLineWidth);
aContext->SetLineCap(strokeOptions.mLineCap);
aContext->SetMiterLimit(strokeOptions.mMiterLimit);
aContext->SetLineJoin(strokeOptions.mLineJoin);
aContext->SetDash(strokeOptions.mDashPattern, strokeOptions.mDashLength,
strokeOptions.mDashOffset);
}
uint16_t SVGUtils::GetGeometryHitTestFlags(nsIFrame* aFrame) {
uint16_t flags = 0;
switch (aFrame->StyleUI()->mPointerEvents) {
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;
if (!aFrame->StyleSVG()->mStrokeOpacity.IsOpacity() ||
aFrame->StyleSVG()->mStrokeOpacity.AsOpacity() > 0)
flags |= SVG_HIT_TEST_CHECK_MRECT;
}
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;
if (!aFrame->StyleSVG()->mStrokeOpacity.IsOpacity() ||
aFrame->StyleSVG()->mStrokeOpacity.AsOpacity() > 0) {
flags |= SVG_HIT_TEST_CHECK_MRECT;
}
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(Element* aElement,
const gfxMatrix& aSVGToAppSpace,
gfxRect* aResult) {
nsIFrame* frame = aElement->GetPrimaryFrame();
ISVGDisplayableFrame* svgFrame = do_QueryFrame(frame);
if (!svgFrame) {
return false;
}
gfxMatrix transform(aSVGToAppSpace);
nsIContent* content = frame->GetContent();
if (content->IsSVGElement()) {
transform = static_cast<SVGElement*>(content)->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(nsIFrame* aNonSVGFrame) {
int32_t appUnitsPerDevPixel =
aNonSVGFrame->PresContext()->AppUnitsPerDevPixel();
float devPxPerCSSPx =
1 / nsPresContext::AppUnitsToFloatCSSPixels(appUnitsPerDevPixel);
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
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