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gecko-dev/layout/svg/SVGGeometryFrame.cpp
Boris Chiou c24d2947b3 Bug 1870200 - Break the cyclic dependency if any of the desendants uses non-scaling-stroke. r=emilio 
While we are computing the transform-box:stroke-box, for CSS Transforms or
Motion path Transforms, we have to avoid the cyclic dependency not only
for the SVG geometry frame itself, but also for the desendants of
the SVG container frame. Therefore, we just compute its fill-box (i.e.
make |getStroke| be false).

https://github.com/w3c/csswg-drafts/issues/9640

Differential Revision: https://phabricator.services.mozilla.com/D203184
2024-03-04 20:46:05 +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:
#include "SVGGeometryFrame.h"
// Keep others in (case-insensitive) order:
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "gfxUtils.h"
#include "mozilla/dom/SVGGeometryElement.h"
#include "mozilla/dom/SVGGraphicsElement.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Helpers.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/PresShell.h"
#include "mozilla/RefPtr.h"
#include "mozilla/SVGContextPaint.h"
#include "mozilla/SVGContentUtils.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/SVGUtils.h"
#include "nsGkAtoms.h"
#include "nsLayoutUtils.h"
#include "SVGAnimatedTransformList.h"
#include "SVGMarkerFrame.h"
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;
//----------------------------------------------------------------------
// Implementation
nsIFrame* NS_NewSVGGeometryFrame(mozilla::PresShell* aPresShell,
mozilla::ComputedStyle* aStyle) {
return new (aPresShell)
mozilla::SVGGeometryFrame(aStyle, aPresShell->GetPresContext());
}
namespace mozilla {
NS_IMPL_FRAMEARENA_HELPERS(SVGGeometryFrame)
//----------------------------------------------------------------------
// nsQueryFrame methods
NS_QUERYFRAME_HEAD(SVGGeometryFrame)
NS_QUERYFRAME_ENTRY(ISVGDisplayableFrame)
NS_QUERYFRAME_ENTRY(SVGGeometryFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsIFrame)
//----------------------------------------------------------------------
// nsIFrame methods
void SVGGeometryFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
AddStateBits(aParent->GetStateBits() & NS_STATE_SVG_CLIPPATH_CHILD);
nsIFrame::Init(aContent, aParent, aPrevInFlow);
}
nsresult SVGGeometryFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
// We don't invalidate for transform changes (the layers code does that).
// Also note that SVGTransformableElement::GetAttributeChangeHint will
// return nsChangeHint_UpdateOverflow for "transform" attribute changes
// and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
if (aNameSpaceID == kNameSpaceID_None &&
(static_cast<SVGGeometryElement*>(GetContent())
->AttributeDefinesGeometry(aAttribute))) {
nsLayoutUtils::PostRestyleEvent(mContent->AsElement(), RestyleHint{0},
nsChangeHint_InvalidateRenderingObservers);
SVGUtils::ScheduleReflowSVG(this);
}
return NS_OK;
}
/* virtual */
void SVGGeometryFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
nsIFrame::DidSetComputedStyle(aOldComputedStyle);
auto* element = static_cast<SVGGeometryElement*>(GetContent());
if (!aOldComputedStyle) {
element->ClearAnyCachedPath();
return;
}
const auto* oldStyleSVG = aOldComputedStyle->StyleSVG();
if (!SVGContentUtils::ShapeTypeHasNoCorners(GetContent())) {
if (StyleSVG()->mStrokeLinecap != oldStyleSVG->mStrokeLinecap &&
element->IsSVGElement(nsGkAtoms::path)) {
// If the stroke-linecap changes to or from "butt" then our element
// needs to update its cached Moz2D Path, since SVGPathData::BuildPath
// decides whether or not to insert little lines into the path for zero
// length subpaths base on that property.
element->ClearAnyCachedPath();
} else if (HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD)) {
if (StyleSVG()->mClipRule != oldStyleSVG->mClipRule) {
// Moz2D Path objects are fill-rule specific.
// For clipPath we use clip-rule as the path's fill-rule.
element->ClearAnyCachedPath();
}
} else {
if (StyleSVG()->mFillRule != oldStyleSVG->mFillRule) {
// Moz2D Path objects are fill-rule specific.
element->ClearAnyCachedPath();
}
}
}
if (element->IsGeometryChangedViaCSS(*Style(), *aOldComputedStyle)) {
element->ClearAnyCachedPath();
}
}
bool SVGGeometryFrame::IsSVGTransformed(
gfx::Matrix* aOwnTransform, gfx::Matrix* aFromParentTransform) const {
return SVGUtils::IsSVGTransformed(this, aOwnTransform, aFromParentTransform);
}
void SVGGeometryFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (!static_cast<const SVGElement*>(GetContent())->HasValidDimensions()) {
return;
}
if (aBuilder->IsForPainting()) {
if (!IsVisibleForPainting()) {
return;
}
if (StyleEffects()->IsTransparent()) {
return;
}
const auto* styleSVG = StyleSVG();
if (styleSVG->mFill.kind.IsNone() && styleSVG->mStroke.kind.IsNone() &&
!styleSVG->HasMarker()) {
return;
}
aBuilder->BuildCompositorHitTestInfoIfNeeded(this,
aLists.BorderBackground());
}
DisplayOutline(aBuilder, aLists);
aLists.Content()->AppendNewToTop<DisplaySVGGeometry>(aBuilder, this);
}
//----------------------------------------------------------------------
// ISVGDisplayableFrame methods
void SVGGeometryFrame::PaintSVG(gfxContext& aContext,
const gfxMatrix& aTransform,
imgDrawingParams& aImgParams) {
if (!StyleVisibility()->IsVisible()) {
return;
}
// Matrix to the geometry's user space:
gfxMatrix newMatrix =
aContext.CurrentMatrixDouble().PreMultiply(aTransform).NudgeToIntegers();
if (newMatrix.IsSingular()) {
return;
}
uint32_t paintOrder = StyleSVG()->mPaintOrder;
if (!paintOrder) {
Render(&aContext, eRenderFill | eRenderStroke, newMatrix, aImgParams);
PaintMarkers(aContext, aTransform, aImgParams);
} else {
while (paintOrder) {
auto component = StylePaintOrder(paintOrder & kPaintOrderMask);
switch (component) {
case StylePaintOrder::Fill:
Render(&aContext, eRenderFill, newMatrix, aImgParams);
break;
case StylePaintOrder::Stroke:
Render(&aContext, eRenderStroke, newMatrix, aImgParams);
break;
case StylePaintOrder::Markers:
PaintMarkers(aContext, aTransform, aImgParams);
break;
default:
MOZ_FALLTHROUGH_ASSERT("Unknown paint-order variant, how?");
case StylePaintOrder::Normal:
break;
}
paintOrder >>= kPaintOrderShift;
}
}
}
nsIFrame* SVGGeometryFrame::GetFrameForPoint(const gfxPoint& aPoint) {
FillRule fillRule;
uint16_t hitTestFlags;
if (HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD)) {
hitTestFlags = SVG_HIT_TEST_FILL;
fillRule = SVGUtils::ToFillRule(StyleSVG()->mClipRule);
} else {
hitTestFlags = SVGUtils::GetGeometryHitTestFlags(this);
if (!hitTestFlags) {
return nullptr;
}
fillRule = SVGUtils::ToFillRule(StyleSVG()->mFillRule);
}
bool isHit = false;
SVGGeometryElement* content = static_cast<SVGGeometryElement*>(GetContent());
// Using ScreenReferenceDrawTarget() opens us to Moz2D backend specific hit-
// testing bugs. Maybe we should use a BackendType::CAIRO DT for hit-testing
// so that we get more consistent/backwards compatible results?
RefPtr<DrawTarget> drawTarget =
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
RefPtr<Path> path = content->GetOrBuildPath(drawTarget, fillRule);
if (!path) {
return nullptr; // no path, so we don't paint anything that can be hit
}
if (hitTestFlags & SVG_HIT_TEST_FILL) {
isHit = path->ContainsPoint(ToPoint(aPoint), {});
}
if (!isHit && (hitTestFlags & SVG_HIT_TEST_STROKE)) {
Point point = ToPoint(aPoint);
SVGContentUtils::AutoStrokeOptions stroke;
SVGContentUtils::GetStrokeOptions(&stroke, content, Style(), nullptr);
gfxMatrix userToOuterSVG;
if (SVGUtils::GetNonScalingStrokeTransform(this, &userToOuterSVG)) {
// We need to transform the path back into the appropriate ancestor
// coordinate system in order for non-scaled stroke to be correct.
// Naturally we also need to transform the point into the same
// coordinate system in order to hit-test against the path.
point = ToMatrix(userToOuterSVG).TransformPoint(point);
RefPtr<PathBuilder> builder =
path->TransformedCopyToBuilder(ToMatrix(userToOuterSVG), fillRule);
path = builder->Finish();
}
isHit = path->StrokeContainsPoint(stroke, point, {});
}
if (isHit && SVGUtils::HitTestClip(this, aPoint)) {
return this;
}
return nullptr;
}
void SVGGeometryFrame::ReflowSVG() {
NS_ASSERTION(SVGUtils::OuterSVGIsCallingReflowSVG(this),
"This call is probably a wasteful mistake");
MOZ_ASSERT(!HasAnyStateBits(NS_FRAME_IS_NONDISPLAY),
"ReflowSVG mechanism not designed for this");
if (!SVGUtils::NeedsReflowSVG(this)) {
return;
}
uint32_t flags = SVGUtils::eBBoxIncludeFill | SVGUtils::eBBoxIncludeStroke |
SVGUtils::eBBoxIncludeMarkers;
// Our "visual" overflow rect needs to be valid for building display lists
// for hit testing, which means that for certain values of 'pointer-events'
// it needs to include the geometry of the fill or stroke even when the fill/
// stroke don't actually render (e.g. when stroke="none" or
// stroke-opacity="0"). GetGeometryHitTestFlags() accounts for
// 'pointer-events'.
uint16_t hitTestFlags = SVGUtils::GetGeometryHitTestFlags(this);
if (hitTestFlags & SVG_HIT_TEST_FILL) {
flags |= SVGUtils::eBBoxIncludeFillGeometry;
}
if (hitTestFlags & SVG_HIT_TEST_STROKE) {
flags |= SVGUtils::eBBoxIncludeStrokeGeometry;
}
gfxRect extent = GetBBoxContribution({}, flags).ToThebesRect();
mRect = nsLayoutUtils::RoundGfxRectToAppRect(extent, AppUnitsPerCSSPixel());
if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
// Make sure we have our filter property (if any) before calling
// FinishAndStoreOverflow (subsequent filter changes are handled off
// nsChangeHint_UpdateEffects):
SVGObserverUtils::UpdateEffects(this);
}
nsRect overflow = nsRect(nsPoint(0, 0), mRect.Size());
OverflowAreas overflowAreas(overflow, overflow);
FinishAndStoreOverflow(overflowAreas, mRect.Size());
RemoveStateBits(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
// Invalidate, but only if this is not our first reflow (since if it is our
// first reflow then we haven't had our first paint yet).
if (!GetParent()->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
InvalidateFrame();
}
}
void SVGGeometryFrame::NotifySVGChanged(uint32_t aFlags) {
MOZ_ASSERT(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
"Invalidation logic may need adjusting");
// Changes to our ancestors may affect how we render when we are rendered as
// part of our ancestor (specifically, if our coordinate context changes size
// and we have percentage lengths defining our geometry, then we need to be
// reflowed). However, ancestor changes cannot affect how we render when we
// are rendered as part of any rendering observers that we may have.
// Therefore no need to notify rendering observers here.
// Don't try to be too smart trying to avoid the ScheduleReflowSVG calls
// for the stroke properties examined below. Checking HasStroke() is not
// enough, since what we care about is whether we include the stroke in our
// overflow rects or not, and we sometimes deliberately include stroke
// when it's not visible. See the complexities of GetBBoxContribution.
if (aFlags & COORD_CONTEXT_CHANGED) {
auto* geom = static_cast<SVGGeometryElement*>(GetContent());
// Stroke currently contributes to our mRect, which is why we have to take
// account of stroke-width here. Note that we do not need to take account
// of stroke-dashoffset since, although that can have a percentage value
// that is resolved against our coordinate context, it does not affect our
// mRect.
const auto& strokeWidth = StyleSVG()->mStrokeWidth;
if (geom->GeometryDependsOnCoordCtx() ||
(strokeWidth.IsLengthPercentage() &&
strokeWidth.AsLengthPercentage().HasPercent())) {
geom->ClearAnyCachedPath();
SVGUtils::ScheduleReflowSVG(this);
}
}
if ((aFlags & TRANSFORM_CHANGED) && StyleSVGReset()->HasNonScalingStroke()) {
// Stroke currently contributes to our mRect, and our stroke depends on
// the transform to our outer-<svg> if |vector-effect:non-scaling-stroke|.
SVGUtils::ScheduleReflowSVG(this);
}
}
SVGBBox SVGGeometryFrame::GetBBoxContribution(const Matrix& aToBBoxUserspace,
uint32_t aFlags) {
SVGBBox bbox;
if (aToBBoxUserspace.IsSingular()) {
// XXX ReportToConsole
return bbox;
}
if ((aFlags & SVGUtils::eForGetClientRects) &&
aToBBoxUserspace.PreservesAxisAlignedRectangles()) {
Rect rect = NSRectToRect(mRect, AppUnitsPerCSSPixel());
bbox = aToBBoxUserspace.TransformBounds(rect);
return bbox;
}
SVGGeometryElement* element = static_cast<SVGGeometryElement*>(GetContent());
const bool getFill = (aFlags & SVGUtils::eBBoxIncludeFillGeometry) ||
((aFlags & SVGUtils::eBBoxIncludeFill) &&
!StyleSVG()->mFill.kind.IsNone());
const bool getStroke =
((aFlags & SVGUtils::eBBoxIncludeStrokeGeometry) ||
((aFlags & SVGUtils::eBBoxIncludeStroke) &&
SVGUtils::HasStroke(this))) &&
// If this frame has non-scaling-stroke and we would like to compute its
// stroke, it may cause a potential cyclical dependency if the caller is
// for transform. In this case, we have to fall back to fill-box, so make
// |getStroke| be false.
// https://github.com/w3c/csswg-drafts/issues/9640
//
// Note:
// 1. We don't care about the computation of the markers below in this
// function because we know the callers don't set
// SVGUtils::eBBoxIncludeMarkers.
// See nsStyleTransformMatrix::GetSVGBox() and
// MotionPathUtils::GetRayContainReferenceSize() for more details.
// 2. We have to break the dependency here *again* because the geometry
// frame may be in the subtree of a SVGContainerFrame, which may not
// set non-scaling-stroke.
!(StyleSVGReset()->HasNonScalingStroke() &&
(aFlags & SVGUtils::eAvoidCycleIfNonScalingStroke));
SVGContentUtils::AutoStrokeOptions strokeOptions;
if (getStroke) {
SVGContentUtils::GetStrokeOptions(&strokeOptions, element, Style(), nullptr,
SVGContentUtils::eIgnoreStrokeDashing);
} else {
// Override the default line width of 1.f so that when we call
// GetGeometryBounds below the result doesn't include stroke bounds.
strokeOptions.mLineWidth = 0.f;
}
Rect simpleBounds;
bool gotSimpleBounds = false;
gfxMatrix userToOuterSVG;
if (getStroke &&
SVGUtils::GetNonScalingStrokeTransform(this, &userToOuterSVG)) {
Matrix moz2dUserToOuterSVG = ToMatrix(userToOuterSVG);
if (moz2dUserToOuterSVG.IsSingular()) {
return bbox;
}
gotSimpleBounds = element->GetGeometryBounds(
&simpleBounds, strokeOptions, aToBBoxUserspace, &moz2dUserToOuterSVG);
} else {
gotSimpleBounds = element->GetGeometryBounds(&simpleBounds, strokeOptions,
aToBBoxUserspace);
}
if (gotSimpleBounds) {
bbox = simpleBounds;
} else {
// Get the bounds using a Moz2D Path object (more expensive):
RefPtr<DrawTarget> tmpDT;
tmpDT = gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
FillRule fillRule = SVGUtils::ToFillRule(
HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD) ? StyleSVG()->mClipRule
: StyleSVG()->mFillRule);
RefPtr<Path> pathInUserSpace = element->GetOrBuildPath(tmpDT, fillRule);
if (!pathInUserSpace) {
return bbox;
}
RefPtr<Path> pathInBBoxSpace;
if (aToBBoxUserspace.IsIdentity()) {
pathInBBoxSpace = pathInUserSpace;
} else {
RefPtr<PathBuilder> builder =
pathInUserSpace->TransformedCopyToBuilder(aToBBoxUserspace, fillRule);
pathInBBoxSpace = builder->Finish();
if (!pathInBBoxSpace) {
return bbox;
}
}
// Be careful when replacing the following logic to get the fill and stroke
// extents independently (instead of computing the stroke extents from the
// path extents). You may think that you can just use the stroke extents if
// there is both a fill and a stroke. In reality it's necessary to
// calculate both the fill and stroke extents, and take the union of the
// two. There are two reasons for this:
//
// # Due to stroke dashing, in certain cases the fill extents could
// actually extend outside the stroke extents.
// # If the stroke is very thin, cairo won't paint any stroke, and so the
// stroke bounds that it will return will be empty.
Rect pathBBoxExtents = pathInBBoxSpace->GetBounds();
if (!pathBBoxExtents.IsFinite()) {
// This can happen in the case that we only have a move-to command in the
// path commands, in which case we know nothing gets rendered.
return bbox;
}
// Account for fill:
if (getFill) {
bbox = pathBBoxExtents;
}
// Account for stroke:
if (getStroke) {
#if 0
// This disabled code is how we would calculate the stroke bounds using
// Moz2D Path::GetStrokedBounds(). Unfortunately at the time of writing
// it there are two problems that prevent us from using it.
//
// First, it seems that some of the Moz2D backends are really dumb. Not
// only do some GetStrokeOptions() implementations sometimes
// significantly overestimate the stroke bounds, but if an argument is
// passed for the aTransform parameter then they just return bounds-of-
// transformed-bounds. These two things combined can lead the bounds to
// be unacceptably oversized, leading to massive over-invalidation.
//
// Second, the way we account for non-scaling-stroke by transforming the
// path using the transform to the outer-<svg> element is not compatible
// with the way that SVGGeometryFrame::Reflow() inserts a scale
// into aToBBoxUserspace and then scales the bounds that we return.
SVGContentUtils::AutoStrokeOptions strokeOptions;
SVGContentUtils::GetStrokeOptions(&strokeOptions, element,
Style(), nullptr,
SVGContentUtils::eIgnoreStrokeDashing);
Rect strokeBBoxExtents;
gfxMatrix userToOuterSVG;
if (SVGUtils::GetNonScalingStrokeTransform(this, &userToOuterSVG)) {
Matrix outerSVGToUser = ToMatrix(userToOuterSVG);
outerSVGToUser.Invert();
Matrix outerSVGToBBox = aToBBoxUserspace * outerSVGToUser;
RefPtr<PathBuilder> builder =
pathInUserSpace->TransformedCopyToBuilder(ToMatrix(userToOuterSVG));
RefPtr<Path> pathInOuterSVGSpace = builder->Finish();
strokeBBoxExtents =
pathInOuterSVGSpace->GetStrokedBounds(strokeOptions, outerSVGToBBox);
} else {
strokeBBoxExtents =
pathInUserSpace->GetStrokedBounds(strokeOptions, aToBBoxUserspace);
}
MOZ_ASSERT(strokeBBoxExtents.IsFinite(), "bbox is about to go bad");
bbox.UnionEdges(strokeBBoxExtents);
#else
// For now we just use SVGUtils::PathExtentsToMaxStrokeExtents:
gfxRect strokeBBoxExtents = SVGUtils::PathExtentsToMaxStrokeExtents(
ThebesRect(pathBBoxExtents), this, ThebesMatrix(aToBBoxUserspace));
MOZ_ASSERT(ToRect(strokeBBoxExtents).IsFinite(),
"bbox is about to go bad");
bbox.UnionEdges(strokeBBoxExtents);
#endif
}
}
// Account for markers:
if ((aFlags & SVGUtils::eBBoxIncludeMarkers) && element->IsMarkable()) {
SVGMarkerFrame* markerFrames[SVGMark::eTypeCount];
if (SVGObserverUtils::GetAndObserveMarkers(this, &markerFrames)) {
nsTArray<SVGMark> marks;
element->GetMarkPoints(&marks);
if (uint32_t num = marks.Length()) {
float strokeWidth = SVGUtils::GetStrokeWidth(this);
for (uint32_t i = 0; i < num; i++) {
const SVGMark& mark = marks[i];
SVGMarkerFrame* frame = markerFrames[mark.type];
if (frame) {
SVGBBox mbbox = frame->GetMarkBBoxContribution(
aToBBoxUserspace, aFlags, this, mark, strokeWidth);
MOZ_ASSERT(mbbox.IsFinite(), "bbox is about to go bad");
bbox.UnionEdges(mbbox);
}
}
}
}
}
return bbox;
}
//----------------------------------------------------------------------
// SVGGeometryFrame methods:
gfxMatrix SVGGeometryFrame::GetCanvasTM() {
NS_ASSERTION(GetParent(), "null parent");
auto* parent = static_cast<SVGContainerFrame*>(GetParent());
auto* content = static_cast<SVGGraphicsElement*>(GetContent());
return content->PrependLocalTransformsTo(parent->GetCanvasTM());
}
void SVGGeometryFrame::Render(gfxContext* aContext, uint32_t aRenderComponents,
const gfxMatrix& aTransform,
imgDrawingParams& aImgParams) {
MOZ_ASSERT(!aTransform.IsSingular());
DrawTarget* drawTarget = aContext->GetDrawTarget();
MOZ_ASSERT(drawTarget);
if (!drawTarget->IsValid()) {
return;
}
FillRule fillRule = SVGUtils::ToFillRule(
HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD) ? StyleSVG()->mClipRule
: StyleSVG()->mFillRule);
SVGGeometryElement* element = static_cast<SVGGeometryElement*>(GetContent());
AntialiasMode aaMode =
(StyleSVG()->mShapeRendering == StyleShapeRendering::Optimizespeed ||
StyleSVG()->mShapeRendering == StyleShapeRendering::Crispedges)
? AntialiasMode::NONE
: AntialiasMode::SUBPIXEL;
// We wait as late as possible before setting the transform so that we don't
// set it unnecessarily if we return early (it's an expensive operation for
// some backends).
gfxContextMatrixAutoSaveRestore autoRestoreTransform(aContext);
aContext->SetMatrixDouble(aTransform);
if (HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD)) {
// We don't complicate this code with GetAsSimplePath since the cost of
// masking will dwarf Path creation overhead anyway.
RefPtr<Path> path = element->GetOrBuildPath(drawTarget, fillRule);
if (path) {
ColorPattern white(ToDeviceColor(sRGBColor(1.0f, 1.0f, 1.0f, 1.0f)));
drawTarget->Fill(path, white,
DrawOptions(1.0f, CompositionOp::OP_OVER, aaMode));
}
return;
}
SVGGeometryElement::SimplePath simplePath;
RefPtr<Path> path;
element->GetAsSimplePath(&simplePath);
if (!simplePath.IsPath()) {
path = element->GetOrBuildPath(drawTarget, fillRule);
if (!path) {
return;
}
}
SVGContextPaint* contextPaint =
SVGContextPaint::GetContextPaint(GetContent());
if (aRenderComponents & eRenderFill) {
GeneralPattern fillPattern;
SVGUtils::MakeFillPatternFor(this, aContext, &fillPattern, aImgParams,
contextPaint);
if (fillPattern.GetPattern()) {
DrawOptions drawOptions(1.0f, CompositionOp::OP_OVER, aaMode);
if (simplePath.IsRect()) {
drawTarget->FillRect(simplePath.AsRect(), fillPattern, drawOptions);
} else if (path) {
drawTarget->Fill(path, fillPattern, drawOptions);
}
}
}
if ((aRenderComponents & eRenderStroke) &&
SVGUtils::HasStroke(this, contextPaint)) {
// Account for vector-effect:non-scaling-stroke:
gfxMatrix userToOuterSVG;
if (SVGUtils::GetNonScalingStrokeTransform(this, &userToOuterSVG)) {
// A simple Rect can't be transformed with rotate/skew, so let's switch
// to using a real path:
if (!path) {
path = element->GetOrBuildPath(drawTarget, fillRule);
if (!path) {
return;
}
simplePath.Reset();
}
// We need to transform the path back into the appropriate ancestor
// coordinate system, and paint it it that coordinate system, in order
// for non-scaled stroke to paint correctly.
gfxMatrix outerSVGToUser = userToOuterSVG;
outerSVGToUser.Invert();
aContext->Multiply(outerSVGToUser);
RefPtr<PathBuilder> builder =
path->TransformedCopyToBuilder(ToMatrix(userToOuterSVG), fillRule);
path = builder->Finish();
}
GeneralPattern strokePattern;
SVGUtils::MakeStrokePatternFor(this, aContext, &strokePattern, aImgParams,
contextPaint);
if (strokePattern.GetPattern()) {
SVGContentUtils::AutoStrokeOptions strokeOptions;
SVGContentUtils::GetStrokeOptions(&strokeOptions,
static_cast<SVGElement*>(GetContent()),
Style(), contextPaint);
// GetStrokeOptions may set the line width to zero as an optimization
if (strokeOptions.mLineWidth <= 0) {
return;
}
DrawOptions drawOptions(1.0f, CompositionOp::OP_OVER, aaMode);
if (simplePath.IsRect()) {
drawTarget->StrokeRect(simplePath.AsRect(), strokePattern,
strokeOptions, drawOptions);
} else if (simplePath.IsLine()) {
drawTarget->StrokeLine(simplePath.Point1(), simplePath.Point2(),
strokePattern, strokeOptions, drawOptions);
} else {
drawTarget->Stroke(path, strokePattern, strokeOptions, drawOptions);
}
}
}
}
bool SVGGeometryFrame::IsInvisible() const {
if (!StyleVisibility()->IsVisible()) {
return true;
}
// Anything below will round to zero later down the pipeline.
constexpr float opacity_threshold = 1.0 / 128.0;
if (StyleEffects()->mOpacity <= opacity_threshold) {
return true;
}
const nsStyleSVG* style = StyleSVG();
SVGContextPaint* contextPaint =
SVGContextPaint::GetContextPaint(GetContent());
if (!style->mFill.kind.IsNone()) {
float opacity = SVGUtils::GetOpacity(style->mFillOpacity, contextPaint);
if (opacity > opacity_threshold) {
return false;
}
}
if (!style->mStroke.kind.IsNone()) {
float opacity = SVGUtils::GetOpacity(style->mStrokeOpacity, contextPaint);
if (opacity > opacity_threshold) {
return false;
}
}
if (style->HasMarker()) {
return false;
}
return true;
}
bool SVGGeometryFrame::CreateWebRenderCommands(
mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder, DisplaySVGGeometry* aItem,
bool aDryRun) {
if (!StyleVisibility()->IsVisible()) {
return true;
}
SVGGeometryElement* element = static_cast<SVGGeometryElement*>(GetContent());
SVGGeometryElement::SimplePath simplePath;
element->GetAsSimplePath(&simplePath);
if (!simplePath.IsRect()) {
return false;
}
const nsStyleSVG* style = StyleSVG();
MOZ_ASSERT(style);
if (!style->mFill.kind.IsColor()) {
return false;
}
switch (style->mFill.kind.tag) {
case StyleSVGPaintKind::Tag::Color:
break;
default:
return false;
}
if (!style->mStroke.kind.IsNone()) {
return false;
}
if (StyleEffects()->HasMixBlendMode()) {
// FIXME: not implemented
return false;
}
if (style->HasMarker() && element->IsMarkable()) {
// Markers aren't suppported yet.
return false;
}
if (!aDryRun) {
auto appUnitsPerDevPx = PresContext()->AppUnitsPerDevPixel();
float scale = (float)AppUnitsPerCSSPixel() / (float)appUnitsPerDevPx;
auto rect = simplePath.AsRect();
rect.Scale(scale);
auto offset = LayoutDevicePoint::FromAppUnits(
aItem->ToReferenceFrame() - GetPosition(), appUnitsPerDevPx);
rect.MoveBy(offset.x, offset.y);
auto wrRect = wr::ToLayoutRect(rect);
SVGContextPaint* contextPaint =
SVGContextPaint::GetContextPaint(GetContent());
// At the moment this code path doesn't support strokes so it fine to
// combine the rectangle's opacity (which has to be applied on the result)
// of (filling + stroking) with the fill opacity.
float elemOpacity = StyleEffects()->mOpacity;
float fillOpacity = SVGUtils::GetOpacity(style->mFillOpacity, contextPaint);
float opacity = elemOpacity * fillOpacity;
auto c = nsLayoutUtils::GetColor(this, &nsStyleSVG::mFill);
wr::ColorF color{
((float)NS_GET_R(c)) / 255.0f, ((float)NS_GET_G(c)) / 255.0f,
((float)NS_GET_B(c)) / 255.0f, ((float)NS_GET_A(c)) / 255.0f * opacity};
aBuilder.PushRect(wrRect, wrRect, !aItem->BackfaceIsHidden(), true, false,
color);
}
return true;
}
void SVGGeometryFrame::PaintMarkers(gfxContext& aContext,
const gfxMatrix& aTransform,
imgDrawingParams& aImgParams) {
auto* element = static_cast<SVGGeometryElement*>(GetContent());
if (!element->IsMarkable()) {
return;
}
SVGMarkerFrame* markerFrames[SVGMark::eTypeCount];
if (!SVGObserverUtils::GetAndObserveMarkers(this, &markerFrames)) {
return;
}
nsTArray<SVGMark> marks;
element->GetMarkPoints(&marks);
if (marks.IsEmpty()) {
return;
}
float strokeWidth = GetStrokeWidthForMarkers();
for (const SVGMark& mark : marks) {
if (auto* frame = markerFrames[mark.type]) {
frame->PaintMark(aContext, aTransform, this, mark, strokeWidth,
aImgParams);
}
}
}
float SVGGeometryFrame::GetStrokeWidthForMarkers() {
float strokeWidth = SVGUtils::GetStrokeWidth(
this, SVGContextPaint::GetContextPaint(GetContent()));
gfxMatrix userToOuterSVG;
if (SVGUtils::GetNonScalingStrokeTransform(this, &userToOuterSVG)) {
// We're not interested in any translation here so we can treat this as
// Singular Value Decomposition (SVD) of a 2 x 2 matrix. That would give us
// sx and sy values as the X and Y scales. The value we want is the XY
// scale i.e. the normalised hypotenuse, which is sqrt(sx^2 + sy^2) /
// sqrt(2). If we use the formulae from
// https://scicomp.stackexchange.com/a/14103, we discover that the
// normalised hypotenuse is simply the square root of the sum of the squares
// of all the 2D matrix elements divided by sqrt(2).
//
// Note that this may need adjusting to support 3D transforms properly.
strokeWidth /= float(sqrt(userToOuterSVG._11 * userToOuterSVG._11 +
userToOuterSVG._12 * userToOuterSVG._12 +
userToOuterSVG._21 * userToOuterSVG._21 +
userToOuterSVG._22 * userToOuterSVG._22) /
M_SQRT2);
}
return strokeWidth;
}
} // namespace mozilla
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