gecko-dev/layout/svg/nsSVGAFrame.cpp

158 lines
4.6 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/. */
// Keep in (case-insensitive) order:
#include "gfxMatrix.h"
#include "mozilla/dom/SVGAElement.h"
#include "nsSVGContainerFrame.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGUtils.h"
#include "SVGLengthList.h"
using namespace mozilla;
typedef nsSVGDisplayContainerFrame nsSVGAFrameBase;
class nsSVGAFrame : public nsSVGAFrameBase
{
friend nsIFrame*
NS_NewSVGAFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
nsSVGAFrame(nsStyleContext* aContext) :
nsSVGAFrameBase(aContext) {}
public:
NS_DECL_FRAMEARENA_HELPERS
#ifdef DEBUG
virtual void Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow) MOZ_OVERRIDE;
#endif
// nsIFrame:
NS_IMETHOD AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType);
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::svgAFrame
*/
virtual nsIAtom* GetType() const;
#ifdef DEBUG_FRAME_DUMP
NS_IMETHOD GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("SVGA"), aResult);
}
#endif
// nsISVGChildFrame interface:
virtual void NotifySVGChanged(uint32_t aFlags);
// nsSVGContainerFrame methods:
virtual gfxMatrix GetCanvasTM(uint32_t aFor,
nsIFrame* aTransformRoot = nullptr) MOZ_OVERRIDE;
private:
nsAutoPtr<gfxMatrix> mCanvasTM;
};
//----------------------------------------------------------------------
// Implementation
nsIFrame*
NS_NewSVGAFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGAFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGAFrame)
//----------------------------------------------------------------------
// nsIFrame methods
#ifdef DEBUG
void
nsSVGAFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVG(nsGkAtoms::a),
"Trying to construct an SVGAFrame for a "
"content element that doesn't support the right interfaces");
nsSVGAFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
NS_IMETHODIMP
nsSVGAFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aNameSpaceID == kNameSpaceID_None &&
aAttribute == nsGkAtoms::transform) {
// 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.
NotifySVGChanged(TRANSFORM_CHANGED);
}
return NS_OK;
}
nsIAtom *
nsSVGAFrame::GetType() const
{
return nsGkAtoms::svgAFrame;
}
//----------------------------------------------------------------------
// nsISVGChildFrame methods
void
nsSVGAFrame::NotifySVGChanged(uint32_t aFlags)
{
NS_ABORT_IF_FALSE(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
"Invalidation logic may need adjusting");
if (aFlags & TRANSFORM_CHANGED) {
// make sure our cached transform matrix gets (lazily) updated
mCanvasTM = nullptr;
}
nsSVGAFrameBase::NotifySVGChanged(aFlags);
}
//----------------------------------------------------------------------
// nsSVGContainerFrame methods:
gfxMatrix
nsSVGAFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot)
{
if (!(GetStateBits() & NS_FRAME_IS_NONDISPLAY) && !aTransformRoot) {
if ((aFor == FOR_PAINTING && NS_SVGDisplayListPaintingEnabled()) ||
(aFor == FOR_HIT_TESTING && NS_SVGDisplayListHitTestingEnabled())) {
return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(this);
}
}
if (!mCanvasTM) {
NS_ASSERTION(mParent, "null parent");
nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
dom::SVGAElement *content = static_cast<dom::SVGAElement*>(mContent);
gfxMatrix tm = content->PrependLocalTransformsTo(
this == aTransformRoot ? gfxMatrix() :
parent->GetCanvasTM(aFor, aTransformRoot));
mCanvasTM = new gfxMatrix(tm);
}
return *mCanvasTM;
}