mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-11 02:56:06 +00:00
437 lines
14 KiB
C++
437 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* 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 "nsSVGClipPathFrame.h"
|
|
|
|
// Keep others in (case-insensitive) order:
|
|
#include "gfxContext.h"
|
|
#include "mozilla/dom/SVGClipPathElement.h"
|
|
#include "nsGkAtoms.h"
|
|
#include "nsSVGEffects.h"
|
|
#include "nsSVGPathGeometryElement.h"
|
|
#include "nsSVGPathGeometryFrame.h"
|
|
#include "nsSVGUtils.h"
|
|
|
|
using namespace mozilla;
|
|
using namespace mozilla::dom;
|
|
using namespace mozilla::gfx;
|
|
|
|
//----------------------------------------------------------------------
|
|
// Implementation
|
|
|
|
nsIFrame*
|
|
NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
|
|
{
|
|
return new (aPresShell) nsSVGClipPathFrame(aContext);
|
|
}
|
|
|
|
NS_IMPL_FRAMEARENA_HELPERS(nsSVGClipPathFrame)
|
|
|
|
nsresult
|
|
nsSVGClipPathFrame::ApplyClipOrPaintClipMask(gfxContext& aContext,
|
|
nsIFrame* aClippedFrame,
|
|
const gfxMatrix& aMatrix)
|
|
{
|
|
DrawTarget& aDrawTarget = *aContext.GetDrawTarget();
|
|
|
|
// If the flag is set when we get here, it means this clipPath frame
|
|
// has already been used painting the current clip, and the document
|
|
// has a clip reference loop.
|
|
if (mInUse) {
|
|
NS_WARNING("Clip loop detected!");
|
|
return NS_OK;
|
|
}
|
|
AutoClipPathReferencer clipRef(this);
|
|
|
|
mMatrixForChildren = GetClipPathTransform(aClippedFrame) * aMatrix;
|
|
|
|
nsISVGChildFrame* singleClipPathChild = nullptr;
|
|
|
|
if (IsTrivial(&singleClipPathChild)) {
|
|
gfxContextMatrixAutoSaveRestore autoRestore(&aContext);
|
|
RefPtr<Path> clipPath;
|
|
if (singleClipPathChild) {
|
|
nsSVGPathGeometryFrame* pathFrame = do_QueryFrame(singleClipPathChild);
|
|
if (pathFrame) {
|
|
nsSVGPathGeometryElement* pathElement =
|
|
static_cast<nsSVGPathGeometryElement*>(pathFrame->GetContent());
|
|
gfxMatrix toChildsUserSpace = pathElement->
|
|
PrependLocalTransformsTo(mMatrixForChildren, eUserSpaceToParent);
|
|
gfxMatrix newMatrix =
|
|
aContext.CurrentMatrix().PreMultiply(toChildsUserSpace).NudgeToIntegers();
|
|
if (!newMatrix.IsSingular()) {
|
|
aContext.SetMatrix(newMatrix);
|
|
clipPath = pathElement->GetOrBuildPath(aDrawTarget,
|
|
nsSVGUtils::ToFillRule(pathFrame->StyleSVG()->mClipRule));
|
|
}
|
|
}
|
|
}
|
|
if (clipPath) {
|
|
aContext.Clip(clipPath);
|
|
} else {
|
|
// The spec says clip away everything if we have no children or the
|
|
// clipping path otherwise can't be resolved:
|
|
aContext.Clip(Rect());
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
// This is a non-trivial clipPath, so we need to paint its contents into a
|
|
// temporary surface and use that to mask the clipped content. Note that
|
|
// nsSVGPathGeometryFrame::Render checks for the NS_STATE_SVG_CLIPPATH_CHILD
|
|
// state bit and paints into our mask surface using opaque black in that case.
|
|
|
|
// Check if this clipPath is itself clipped by another clipPath:
|
|
nsSVGClipPathFrame *clipPathFrame =
|
|
nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nullptr);
|
|
bool referencedClipIsTrivial;
|
|
if (clipPathFrame) {
|
|
referencedClipIsTrivial = clipPathFrame->IsTrivial();
|
|
aContext.Save();
|
|
if (referencedClipIsTrivial) {
|
|
clipPathFrame->ApplyClipOrPaintClipMask(aContext, aClippedFrame, aMatrix);
|
|
} else {
|
|
Matrix maskTransform;
|
|
RefPtr<SourceSurface> mask = clipPathFrame->GetClipMask(aContext, aClippedFrame, aMatrix, &maskTransform);
|
|
|
|
aContext.PushGroupForBlendBack(gfxContentType::ALPHA, 1.0, mask, maskTransform);
|
|
}
|
|
}
|
|
|
|
for (nsIFrame* kid = mFrames.FirstChild(); kid;
|
|
kid = kid->GetNextSibling()) {
|
|
nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
|
|
if (SVGFrame) {
|
|
// The CTM of each frame referencing us can be different.
|
|
SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);
|
|
|
|
bool isOK = true;
|
|
nsSVGClipPathFrame *clipPathFrame =
|
|
nsSVGEffects::GetEffectProperties(kid).GetClipPathFrame(&isOK);
|
|
if (!isOK) {
|
|
continue;
|
|
}
|
|
|
|
bool isTrivial;
|
|
|
|
if (clipPathFrame) {
|
|
isTrivial = clipPathFrame->IsTrivial();
|
|
aContext.Save();
|
|
if (isTrivial) {
|
|
clipPathFrame->ApplyClipOrPaintClipMask(aContext, aClippedFrame, aMatrix);
|
|
} else {
|
|
Matrix maskTransform;
|
|
RefPtr<SourceSurface> mask = clipPathFrame->GetClipMask(aContext, aClippedFrame, aMatrix, &maskTransform);
|
|
|
|
aContext.PushGroupForBlendBack(gfxContentType::ALPHA, 1.0, mask, maskTransform);
|
|
}
|
|
}
|
|
|
|
gfxMatrix toChildsUserSpace = mMatrixForChildren;
|
|
nsIFrame* child = do_QueryFrame(SVGFrame);
|
|
nsIContent* childContent = child->GetContent();
|
|
if (childContent->IsSVGElement()) {
|
|
toChildsUserSpace =
|
|
static_cast<const nsSVGElement*>(childContent)->
|
|
PrependLocalTransformsTo(mMatrixForChildren, eUserSpaceToParent);
|
|
}
|
|
SVGFrame->PaintSVG(aContext, toChildsUserSpace);
|
|
|
|
if (clipPathFrame) {
|
|
if (!isTrivial) {
|
|
aContext.PopGroupAndBlend();
|
|
}
|
|
aContext.Restore();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (clipPathFrame) {
|
|
if (!referencedClipIsTrivial) {
|
|
aContext.PopGroupAndBlend();
|
|
}
|
|
aContext.Restore();
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
already_AddRefed<SourceSurface>
|
|
nsSVGClipPathFrame::GetClipMask(gfxContext& aReferenceContext, nsIFrame* aClippedFrame,
|
|
const gfxMatrix& aMatrix, Matrix* aMaskTransform,
|
|
SourceSurface* aInputMask, const Matrix& aInputMaskTransform)
|
|
{
|
|
if (IsTrivial()) {
|
|
return nullptr;
|
|
}
|
|
|
|
IntRect intRect;
|
|
{
|
|
gfxContextMatrixAutoSaveRestore autoRestoreMatrix(&aReferenceContext);
|
|
|
|
aReferenceContext.SetMatrix(gfxMatrix());
|
|
gfxRect rect = aReferenceContext.GetClipExtents();
|
|
intRect = RoundedOut(ToRect(rect));
|
|
}
|
|
|
|
if (intRect.IsEmpty()) {
|
|
// We don't need to create a mask surface, all drawing is clipped anyway.
|
|
return nullptr;
|
|
}
|
|
|
|
RefPtr<DrawTarget> maskDT = aReferenceContext.GetDrawTarget()->CreateSimilarDrawTarget(intRect.Size(), SurfaceFormat::A8);
|
|
|
|
gfxMatrix mat =
|
|
aReferenceContext.CurrentMatrix() * gfxMatrix::Translation(-intRect.TopLeft());
|
|
{
|
|
RefPtr<gfxContext> ctx = new gfxContext(maskDT);
|
|
ctx->SetMatrix(mat);
|
|
ApplyClipOrPaintClipMask(*ctx, aClippedFrame, aMatrix);
|
|
}
|
|
|
|
mat.Invert();
|
|
|
|
if (aInputMask) {
|
|
MOZ_ASSERT(!aInputMaskTransform.HasNonTranslation());
|
|
|
|
RefPtr<SourceSurface> currentMask = maskDT->Snapshot();
|
|
maskDT->SetTransform(Matrix());
|
|
maskDT->ClearRect(Rect(0, 0, intRect.width, intRect.height));
|
|
maskDT->MaskSurface(SurfacePattern(currentMask, ExtendMode::CLAMP), aInputMask,
|
|
Point(aInputMaskTransform._31 - intRect.x, aInputMaskTransform._32 - intRect.y));
|
|
}
|
|
|
|
*aMaskTransform = ToMatrix(mat);
|
|
return maskDT->Snapshot();
|
|
}
|
|
|
|
bool
|
|
nsSVGClipPathFrame::PointIsInsideClipPath(nsIFrame* aClippedFrame,
|
|
const gfxPoint &aPoint)
|
|
{
|
|
// If the flag is set when we get here, it means this clipPath frame
|
|
// has already been used in hit testing against the current clip,
|
|
// and the document has a clip reference loop.
|
|
if (mInUse) {
|
|
NS_WARNING("Clip loop detected!");
|
|
return false;
|
|
}
|
|
AutoClipPathReferencer clipRef(this);
|
|
|
|
gfxMatrix matrix = GetClipPathTransform(aClippedFrame);
|
|
if (!matrix.Invert()) {
|
|
return false;
|
|
}
|
|
gfxPoint point = matrix.Transform(aPoint);
|
|
|
|
// clipPath elements can themselves be clipped by a different clip path. In
|
|
// that case the other clip path further clips away the element that is being
|
|
// clipped by the original clipPath. If this clipPath is being clipped by a
|
|
// different clip path we need to check if it prevents the original element
|
|
// from recieving events at aPoint:
|
|
nsSVGClipPathFrame *clipPathFrame =
|
|
nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nullptr);
|
|
if (clipPathFrame &&
|
|
!clipPathFrame->PointIsInsideClipPath(aClippedFrame, aPoint)) {
|
|
return false;
|
|
}
|
|
|
|
for (nsIFrame* kid = mFrames.FirstChild(); kid;
|
|
kid = kid->GetNextSibling()) {
|
|
nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
|
|
if (SVGFrame) {
|
|
gfxPoint pointForChild = point;
|
|
gfxMatrix m = static_cast<nsSVGElement*>(kid->GetContent())->
|
|
PrependLocalTransformsTo(gfxMatrix(), eUserSpaceToParent);
|
|
if (!m.IsIdentity()) {
|
|
if (!m.Invert()) {
|
|
return false;
|
|
}
|
|
pointForChild = m.Transform(point);
|
|
}
|
|
if (SVGFrame->GetFrameForPoint(pointForChild)) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
nsSVGClipPathFrame::IsTrivial(nsISVGChildFrame **aSingleChild)
|
|
{
|
|
// If the clip path is clipped then it's non-trivial
|
|
if (nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nullptr))
|
|
return false;
|
|
|
|
if (aSingleChild) {
|
|
*aSingleChild = nullptr;
|
|
}
|
|
|
|
nsISVGChildFrame *foundChild = nullptr;
|
|
|
|
for (nsIFrame* kid = mFrames.FirstChild(); kid;
|
|
kid = kid->GetNextSibling()) {
|
|
nsISVGChildFrame *svgChild = do_QueryFrame(kid);
|
|
if (svgChild) {
|
|
// We consider a non-trivial clipPath to be one containing
|
|
// either more than one svg child and/or a svg container
|
|
if (foundChild || svgChild->IsDisplayContainer())
|
|
return false;
|
|
|
|
// or where the child is itself clipped
|
|
if (nsSVGEffects::GetEffectProperties(kid).GetClipPathFrame(nullptr))
|
|
return false;
|
|
|
|
foundChild = svgChild;
|
|
}
|
|
}
|
|
if (aSingleChild) {
|
|
*aSingleChild = foundChild;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nsSVGClipPathFrame::IsValid()
|
|
{
|
|
if (mInUse) {
|
|
NS_WARNING("Clip loop detected!");
|
|
return false;
|
|
}
|
|
AutoClipPathReferencer clipRef(this);
|
|
|
|
bool isOK = true;
|
|
nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(&isOK);
|
|
if (!isOK) {
|
|
return false;
|
|
}
|
|
|
|
for (nsIFrame* kid = mFrames.FirstChild(); kid;
|
|
kid = kid->GetNextSibling()) {
|
|
|
|
nsIAtom *type = kid->GetType();
|
|
|
|
if (type == nsGkAtoms::svgUseFrame) {
|
|
for (nsIFrame* grandKid = kid->GetFirstPrincipalChild(); grandKid;
|
|
grandKid = grandKid->GetNextSibling()) {
|
|
|
|
nsIAtom *type = grandKid->GetType();
|
|
|
|
if (type != nsGkAtoms::svgPathGeometryFrame &&
|
|
type != nsGkAtoms::svgTextFrame) {
|
|
return false;
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
if (type != nsGkAtoms::svgPathGeometryFrame &&
|
|
type != nsGkAtoms::svgTextFrame) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
nsresult
|
|
nsSVGClipPathFrame::AttributeChanged(int32_t aNameSpaceID,
|
|
nsIAtom* aAttribute,
|
|
int32_t aModType)
|
|
{
|
|
if (aNameSpaceID == kNameSpaceID_None) {
|
|
if (aAttribute == nsGkAtoms::transform) {
|
|
nsSVGEffects::InvalidateDirectRenderingObservers(this);
|
|
nsSVGUtils::NotifyChildrenOfSVGChange(this,
|
|
nsISVGChildFrame::TRANSFORM_CHANGED);
|
|
}
|
|
if (aAttribute == nsGkAtoms::clipPathUnits) {
|
|
nsSVGEffects::InvalidateDirectRenderingObservers(this);
|
|
}
|
|
}
|
|
|
|
return nsSVGClipPathFrameBase::AttributeChanged(aNameSpaceID,
|
|
aAttribute, aModType);
|
|
}
|
|
|
|
void
|
|
nsSVGClipPathFrame::Init(nsIContent* aContent,
|
|
nsContainerFrame* aParent,
|
|
nsIFrame* aPrevInFlow)
|
|
{
|
|
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::clipPath),
|
|
"Content is not an SVG clipPath!");
|
|
|
|
AddStateBits(NS_STATE_SVG_CLIPPATH_CHILD);
|
|
nsSVGClipPathFrameBase::Init(aContent, aParent, aPrevInFlow);
|
|
}
|
|
|
|
nsIAtom *
|
|
nsSVGClipPathFrame::GetType() const
|
|
{
|
|
return nsGkAtoms::svgClipPathFrame;
|
|
}
|
|
|
|
gfxMatrix
|
|
nsSVGClipPathFrame::GetCanvasTM()
|
|
{
|
|
return mMatrixForChildren;
|
|
}
|
|
|
|
gfxMatrix
|
|
nsSVGClipPathFrame::GetClipPathTransform(nsIFrame* aClippedFrame)
|
|
{
|
|
SVGClipPathElement *content = static_cast<SVGClipPathElement*>(mContent);
|
|
|
|
gfxMatrix tm = content->PrependLocalTransformsTo(gfxMatrix());
|
|
|
|
nsSVGEnum* clipPathUnits =
|
|
&content->mEnumAttributes[SVGClipPathElement::CLIPPATHUNITS];
|
|
|
|
return nsSVGUtils::AdjustMatrixForUnits(tm, clipPathUnits, aClippedFrame);
|
|
}
|
|
|
|
SVGBBox
|
|
nsSVGClipPathFrame::GetBBoxForClipPathFrame(const SVGBBox &aBBox,
|
|
const gfxMatrix &aMatrix)
|
|
{
|
|
nsIContent* node = GetContent()->GetFirstChild();
|
|
SVGBBox unionBBox, tmpBBox;
|
|
for (; node; node = node->GetNextSibling()) {
|
|
nsIFrame *frame =
|
|
static_cast<nsSVGElement*>(node)->GetPrimaryFrame();
|
|
if (frame) {
|
|
nsISVGChildFrame *svg = do_QueryFrame(frame);
|
|
if (svg) {
|
|
tmpBBox = svg->GetBBoxContribution(mozilla::gfx::ToMatrix(aMatrix),
|
|
nsSVGUtils::eBBoxIncludeFill);
|
|
nsSVGEffects::EffectProperties effectProperties =
|
|
nsSVGEffects::GetEffectProperties(frame);
|
|
bool isOK = true;
|
|
nsSVGClipPathFrame *clipPathFrame =
|
|
effectProperties.GetClipPathFrame(&isOK);
|
|
if (clipPathFrame && isOK) {
|
|
tmpBBox = clipPathFrame->GetBBoxForClipPathFrame(tmpBBox, aMatrix);
|
|
}
|
|
tmpBBox.Intersect(aBBox);
|
|
unionBBox.UnionEdges(tmpBBox);
|
|
}
|
|
}
|
|
}
|
|
nsSVGEffects::EffectProperties props =
|
|
nsSVGEffects::GetEffectProperties(this);
|
|
if (props.mClipPath) {
|
|
bool isOK = true;
|
|
nsSVGClipPathFrame *clipPathFrame = props.GetClipPathFrame(&isOK);
|
|
if (clipPathFrame && isOK) {
|
|
tmpBBox = clipPathFrame->GetBBoxForClipPathFrame(aBBox, aMatrix);
|
|
unionBBox.Intersect(tmpBBox);
|
|
} else if (!isOK) {
|
|
unionBBox = SVGBBox();
|
|
}
|
|
}
|
|
return unionBBox;
|
|
}
|