Revision 77c3f235541dddac658ed943e3f24989e683b6f2 authored by seabld on 01 April 2013, 03:07:58 UTC, committed by seabld on 01 April 2013, 03:07:58 UTC
--HG-- branch : GECKO200_2013032617_RELBRANCH
1 parent a56b1cb
nsSVGClipPathFrame.cpp
/* -*- 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 "nsGkAtoms.h"
#include "nsIDOMSVGClipPathElement.h"
#include "nsRenderingContext.h"
#include "nsSVGClipPathElement.h"
#include "nsSVGEffects.h"
#include "nsSVGUtils.h"
//----------------------------------------------------------------------
// Implementation
nsIFrame*
NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGClipPathFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGClipPathFrame)
nsresult
nsSVGClipPathFrame::ClipPaint(nsRenderingContext* aContext,
nsIFrame* aParent,
const gfxMatrix &aMatrix)
{
// 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);
mClipParent = aParent;
if (mClipParentMatrix) {
*mClipParentMatrix = aMatrix;
} else {
mClipParentMatrix = new gfxMatrix(aMatrix);
}
gfxContext *gfx = aContext->ThebesContext();
nsISVGChildFrame *singleClipPathChild = nullptr;
if (IsTrivial(&singleClipPathChild)) {
// Notify our child that it's painting as part of a clipPath, and that
// we only require it to draw its path (it should skip filling, etc.):
SVGAutoRenderState mode(aContext, SVGAutoRenderState::CLIP);
if (!singleClipPathChild) {
// We have no children - the spec says clip away everything:
gfx->Rectangle(gfxRect());
} else {
singleClipPathChild->NotifySVGChanged(
nsISVGChildFrame::TRANSFORM_CHANGED);
singleClipPathChild->PaintSVG(aContext, nullptr);
}
gfx->Clip();
gfx->NewPath();
return NS_OK;
}
// Seems like this is a non-trivial clipPath, so we need to use a clip mask.
// Notify our children that they're painting into a clip mask:
SVGAutoRenderState mode(aContext, SVGAutoRenderState::CLIP_MASK);
// Check if this clipPath is itself clipped by another clipPath:
nsSVGClipPathFrame *clipPathFrame =
nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nullptr);
bool referencedClipIsTrivial;
if (clipPathFrame) {
referencedClipIsTrivial = clipPathFrame->IsTrivial();
gfx->Save();
if (referencedClipIsTrivial) {
clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
} else {
gfx->PushGroup(gfxASurface::CONTENT_ALPHA);
}
}
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();
gfx->Save();
if (isTrivial) {
clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
} else {
gfx->PushGroup(gfxASurface::CONTENT_ALPHA);
}
}
SVGFrame->PaintSVG(aContext, nullptr);
if (clipPathFrame) {
if (!isTrivial) {
gfx->PopGroupToSource();
nsRefPtr<gfxPattern> clipMaskSurface;
gfx->PushGroup(gfxASurface::CONTENT_ALPHA);
clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
clipMaskSurface = gfx->PopGroup();
if (clipMaskSurface) {
gfx->Mask(clipMaskSurface);
}
}
gfx->Restore();
}
}
}
if (clipPathFrame) {
if (!referencedClipIsTrivial) {
gfx->PopGroupToSource();
nsRefPtr<gfxPattern> clipMaskSurface;
gfx->PushGroup(gfxASurface::CONTENT_ALPHA);
clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
clipMaskSurface = gfx->PopGroup();
if (clipMaskSurface) {
gfx->Mask(clipMaskSurface);
}
}
gfx->Restore();
}
return NS_OK;
}
bool
nsSVGClipPathFrame::ClipHitTest(nsIFrame* aParent,
const gfxMatrix &aMatrix,
const nsPoint &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);
mClipParent = aParent;
if (mClipParentMatrix) {
*mClipParentMatrix = aMatrix;
} else {
mClipParentMatrix = new gfxMatrix(aMatrix);
}
nsSVGClipPathFrame *clipPathFrame =
nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nullptr);
if (clipPathFrame && !clipPathFrame->ClipHitTest(aParent, aMatrix, aPoint))
return false;
for (nsIFrame* kid = mFrames.FirstChild(); kid;
kid = kid->GetNextSibling()) {
nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
if (SVGFrame) {
// Notify the child frame that we may be working with a
// different transform, so it can update its covered region
// (used to shortcut hit testing).
SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);
if (SVGFrame->GetFrameForPoint(aPoint))
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;
}
NS_IMETHODIMP
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::InvalidateRenderingObservers(this);
}
}
return nsSVGClipPathFrameBase::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
}
NS_IMETHODIMP
nsSVGClipPathFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
#ifdef DEBUG
nsCOMPtr<nsIDOMSVGClipPathElement> clipPath = do_QueryInterface(aContent);
NS_ASSERTION(clipPath, "Content is not an SVG clipPath!");
#endif
AddStateBits(NS_STATE_SVG_CLIPPATH_CHILD);
return nsSVGClipPathFrameBase::Init(aContent, aParent, aPrevInFlow);
}
nsIAtom *
nsSVGClipPathFrame::GetType() const
{
return nsGkAtoms::svgClipPathFrame;
}
gfxMatrix
nsSVGClipPathFrame::GetCanvasTM(uint32_t aFor)
{
nsSVGClipPathElement *content = static_cast<nsSVGClipPathElement*>(mContent);
gfxMatrix tm =
content->PrependLocalTransformsTo(mClipParentMatrix ?
*mClipParentMatrix : gfxMatrix());
return nsSVGUtils::AdjustMatrixForUnits(tm,
&content->mEnumAttributes[nsSVGClipPathElement::CLIPPATHUNITS],
mClipParent);
}
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