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gecko-dev/layout/svg/SVGGeometryFrame.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// 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 "nsDisplayList.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)
void DisplaySVGGeometry::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
SVGGeometryFrame* frame = static_cast<SVGGeometryFrame*>(mFrame);
nsPoint pointRelativeToReferenceFrame = aRect.Center();
// ToReferenceFrame() includes frame->GetPosition(), our user space position.
nsPoint userSpacePtInAppUnits = pointRelativeToReferenceFrame -
(ToReferenceFrame() - frame->GetPosition());
gfxPoint userSpacePt =
gfxPoint(userSpacePtInAppUnits.x, userSpacePtInAppUnits.y) /
AppUnitsPerCSSPixel();
if (frame->GetFrameForPoint(userSpacePt)) {
aOutFrames->AppendElement(frame);
}
}
void DisplaySVGGeometry::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
uint32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
// ToReferenceFrame includes our mRect offset, but painting takes
// account of that too. To avoid double counting, we subtract that
// here.
nsPoint offset = ToReferenceFrame() - mFrame->GetPosition();
gfxPoint devPixelOffset =
nsLayoutUtils::PointToGfxPoint(offset, appUnitsPerDevPixel);
gfxMatrix tm = SVGUtils::GetCSSPxToDevPxMatrix(mFrame) *
gfxMatrix::Translation(devPixelOffset);
imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
static_cast<SVGGeometryFrame*>(mFrame)->PaintSVG(*aCtx, tm, imgParams);
nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, imgParams.result);
}
void DisplaySVGGeometry::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
const auto* geometry =
static_cast<const nsDisplayItemGenericImageGeometry*>(aGeometry);
if (aBuilder->ShouldSyncDecodeImages() &&
geometry->ShouldInvalidateToSyncDecodeImages()) {
bool snap;
aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
}
nsPaintedDisplayItem::ComputeInvalidationRegion(aBuilder, aGeometry,
aInvalidRegion);
}
//----------------------------------------------------------------------
// nsIFrame methods
void SVGGeometryFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
AddStateBits(aParent->GetStateBits() & NS_STATE_SVG_CLIPPATH_CHILD);
nsIFrame::Init(aContent, aParent, aPrevInFlow);
AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
}
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 {
bool foundTransform = false;
// Check if our parent has children-only transforms:
nsIFrame* parent = GetParent();
if (parent &&
parent->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer)) {
foundTransform =
static_cast<SVGContainerFrame*>(parent)->HasChildrenOnlyTransform(
aFromParentTransform);
}
SVGElement* content = static_cast<SVGElement*>(GetContent());
SVGAnimatedTransformList* transformList = content->GetAnimatedTransformList();
if ((transformList && transformList->HasTransform()) ||
content->GetAnimateMotionTransform()) {
if (aOwnTransform) {
*aOwnTransform = gfx::ToMatrix(
content->PrependLocalTransformsTo(gfxMatrix(), eUserSpaceToParent));
}
foundTransform = true;
}
return foundTransform;
}
void SVGGeometryFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (!static_cast<const SVGElement*>(GetContent())->HasValidDimensions()) {
return;
}
if (aBuilder->IsForPainting()) {
if (!IsVisibleForPainting()) {
return;
}
if (StyleEffects()->mOpacity == 0.0f) {
return;
}
const auto* styleSVG = StyleSVG();
if (Type() != LayoutFrameType::SVGImage && styleSVG->mFill.kind.IsNone() &&
styleSVG->mStroke.kind.IsNone() && styleSVG->mMarkerEnd.IsNone() &&
styleSVG->mMarkerMid.IsNone() && styleSVG->mMarkerStart.IsNone()) {
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,
const nsIntRect* aDirtyRect) {
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 = GetHitTestFlags();
if (!hitTestFlags) {
return nullptr;
}
if (hitTestFlags & SVG_HIT_TEST_CHECK_MRECT) {
gfxRect rect = nsLayoutUtils::RectToGfxRect(mRect, AppUnitsPerCSSPixel());
if (!rect.Contains(aPoint)) {
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), Matrix());
}
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, Matrix());
}
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"). GetHitTestFlags() accounts for 'pointer-events'.
uint16_t hitTestFlags = GetHitTestFlags();
if ((hitTestFlags & SVG_HIT_TEST_FILL)) {
flags |= SVGUtils::eBBoxIncludeFillGeometry;
}
if ((hitTestFlags & SVG_HIT_TEST_STROKE)) {
flags |= SVGUtils::eBBoxIncludeStrokeGeometry;
}
gfxRect extent = GetBBoxContribution(Matrix(), flags).ToThebesRect();
mRect = nsLayoutUtils::RoundGfxRectToAppRect(extent, AppUnitsPerCSSPixel());
if (mState & 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());
bool getFill = (aFlags & SVGUtils::eBBoxIncludeFillGeometry) ||
((aFlags & SVGUtils::eBBoxIncludeFill) &&
!StyleSVG()->mFill.kind.IsNone());
bool getStroke =
(aFlags & SVGUtils::eBBoxIncludeStrokeGeometry) ||
((aFlags & SVGUtils::eBBoxIncludeStroke) && SVGUtils::HasStroke(this));
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;
#ifdef XP_WIN
// Unfortunately D2D backed DrawTarget produces bounds with rounding errors
// when whole number results are expected, even in the case of trivial
// calculations. To avoid that and meet the expectations of web content we
// have to use a CAIRO DrawTarget. The most efficient way to do that is to
// wrap the cached cairo_surface_t from ScreenReferenceSurface():
RefPtr<gfxASurface> refSurf =
gfxPlatform::GetPlatform()->ScreenReferenceSurface();
tmpDT = gfxPlatform::CreateDrawTargetForSurface(refSurf, IntSize(1, 1));
#else
tmpDT = gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
#endif
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) != 0 && 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);
}
}
}
}
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;
}
uint16_t SVGGeometryFrame::GetHitTestFlags() {
return SVGUtils::GetGeometryHitTestFlags(this);
}
} // namespace mozilla
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