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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
// Main header first:
#include "SVGFilterFrame.h"
// Keep others in (case-insensitive) order:
#include "AutoReferenceChainGuard.h"
#include "gfxUtils.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/SVGFilterElement.h"
#include "nsGkAtoms.h"
#include "SVGObserverUtils.h"
#include "SVGElement.h"
#include "SVGFilterInstance.h"
#include "nsContentUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
nsIFrame* NS_NewSVGFilterFrame(mozilla::PresShell* aPresShell,
mozilla::ComputedStyle* aStyle) {
return new (aPresShell)
mozilla::SVGFilterFrame(aStyle, aPresShell->GetPresContext());
}
namespace mozilla {
NS_IMPL_FRAMEARENA_HELPERS(SVGFilterFrame)
uint16_t SVGFilterFrame::GetEnumValue(uint32_t aIndex, nsIContent* aDefault) {
SVGAnimatedEnumeration& thisEnum =
static_cast<SVGFilterElement*>(GetContent())->mEnumAttributes[aIndex];
if (thisEnum.IsExplicitlySet()) {
return thisEnum.GetAnimValue();
}
// Before we recurse, make sure we'll break reference loops and over long
// reference chains:
static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
AutoReferenceChainGuard refChainGuard(this, &mLoopFlag,
&sRefChainLengthCounter);
if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
// Break reference chain
return static_cast<SVGFilterElement*>(aDefault)
->mEnumAttributes[aIndex]
.GetAnimValue();
}
SVGFilterFrame* next = GetReferencedFilter();
return next ? next->GetEnumValue(aIndex, aDefault)
: static_cast<SVGFilterElement*>(aDefault)
->mEnumAttributes[aIndex]
.GetAnimValue();
}
const SVGAnimatedLength* SVGFilterFrame::GetLengthValue(uint32_t aIndex,
nsIContent* aDefault) {
const SVGAnimatedLength* thisLength =
&static_cast<SVGFilterElement*>(GetContent())->mLengthAttributes[aIndex];
if (thisLength->IsExplicitlySet()) {
return thisLength;
}
// Before we recurse, make sure we'll break reference loops and over long
// reference chains:
static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
AutoReferenceChainGuard refChainGuard(this, &mLoopFlag,
&sRefChainLengthCounter);
if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
// Break reference chain
return &static_cast<SVGFilterElement*>(aDefault)->mLengthAttributes[aIndex];
}
SVGFilterFrame* next = GetReferencedFilter();
return next ? next->GetLengthValue(aIndex, aDefault)
: &static_cast<SVGFilterElement*>(aDefault)
->mLengthAttributes[aIndex];
}
const SVGFilterElement* SVGFilterFrame::GetFilterContent(nsIContent* aDefault) {
for (nsIContent* child = mContent->GetFirstChild(); child;
child = child->GetNextSibling()) {
if (child->IsSVGFilterPrimitiveElement()) {
return static_cast<SVGFilterElement*>(GetContent());
}
}
// Before we recurse, make sure we'll break reference loops and over long
// reference chains:
static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
AutoReferenceChainGuard refChainGuard(this, &mLoopFlag,
&sRefChainLengthCounter);
if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
// Break reference chain
return static_cast<SVGFilterElement*>(aDefault);
}
SVGFilterFrame* next = GetReferencedFilter();
return next ? next->GetFilterContent(aDefault)
: static_cast<SVGFilterElement*>(aDefault);
}
SVGFilterFrame* SVGFilterFrame::GetReferencedFilter() {
if (mNoHRefURI) {
return nullptr;
}
auto GetHref = [this](nsAString& aHref) {
SVGFilterElement* filter = static_cast<SVGFilterElement*>(GetContent());
if (filter->mStringAttributes[SVGFilterElement::HREF].IsExplicitlySet()) {
filter->mStringAttributes[SVGFilterElement::HREF].GetAnimValue(aHref,
filter);
} else {
filter->mStringAttributes[SVGFilterElement::XLINK_HREF].GetAnimValue(
aHref, filter);
}
this->mNoHRefURI = aHref.IsEmpty();
};
nsIFrame* tframe = SVGObserverUtils::GetAndObserveTemplate(this, GetHref);
if (tframe && tframe->IsSVGFilterFrame()) {
return static_cast<SVGFilterFrame*>(tframe);
}
// We don't call SVGObserverUtils::RemoveTemplateObserver and set
// `mNoHRefURI = false` here since we want to be invalidated if the ID
// specified by our href starts resolving to a different/valid element.
return nullptr;
}
nsresult SVGFilterFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
if (aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y ||
aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height ||
aAttribute == nsGkAtoms::filterUnits ||
aAttribute == nsGkAtoms::primitiveUnits)) {
SVGObserverUtils::InvalidateRenderingObservers(this);
} else if ((aNameSpaceID == kNameSpaceID_XLink ||
aNameSpaceID == kNameSpaceID_None) &&
aAttribute == nsGkAtoms::href) {
// Blow away our reference, if any
SVGObserverUtils::RemoveTemplateObserver(this);
mNoHRefURI = false;
// And update whoever references us
SVGObserverUtils::InvalidateRenderingObservers(this);
}
return SVGContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
aModType);
}
#ifdef DEBUG
void SVGFilterFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::filter),
"Content is not an SVG filter");
SVGContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
} // namespace mozilla