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/* -*- 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 "nsSVGFilterFrame.h"
// Keep others in (case-insensitive) order:
#include "gfxUtils.h"
#include "nsGkAtoms.h"
#include "nsSVGEffects.h"
#include "nsSVGElement.h"
#include "mozilla/dom/SVGFilterElement.h"
#include "nsSVGFilterInstance.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGUtils.h"
#include "nsContentUtils.h"
using namespace mozilla::dom;
nsIFrame*
NS_NewSVGFilterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGFilterFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGFilterFrame)
class MOZ_RAII nsSVGFilterFrame::AutoFilterReferencer
{
public:
explicit AutoFilterReferencer(nsSVGFilterFrame *aFrame MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mFrame(aFrame)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
// Reference loops should normally be detected in advance and handled, so
// we're not expecting to encounter them here
MOZ_ASSERT(!mFrame->mLoopFlag, "Undetected reference loop!");
mFrame->mLoopFlag = true;
}
~AutoFilterReferencer() {
mFrame->mLoopFlag = false;
}
private:
nsSVGFilterFrame *mFrame;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
uint16_t
nsSVGFilterFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
{
nsSVGEnum& thisEnum =
static_cast<SVGFilterElement *>(mContent)->mEnumAttributes[aIndex];
if (thisEnum.IsExplicitlySet())
return thisEnum.GetAnimValue();
AutoFilterReferencer filterRef(this);
nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
return next ? next->GetEnumValue(aIndex, aDefault) :
static_cast<SVGFilterElement *>(aDefault)->
mEnumAttributes[aIndex].GetAnimValue();
}
const nsSVGLength2 *
nsSVGFilterFrame::GetLengthValue(uint32_t aIndex, nsIContent *aDefault)
{
const nsSVGLength2 *thisLength =
&static_cast<SVGFilterElement *>(mContent)->mLengthAttributes[aIndex];
if (thisLength->IsExplicitlySet())
return thisLength;
AutoFilterReferencer filterRef(this);
nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
return next ? next->GetLengthValue(aIndex, aDefault) :
&static_cast<SVGFilterElement *>(aDefault)->mLengthAttributes[aIndex];
}
const SVGFilterElement *
nsSVGFilterFrame::GetFilterContent(nsIContent *aDefault)
{
for (nsIContent* child = mContent->GetFirstChild();
child;
child = child->GetNextSibling()) {
RefPtr<nsSVGFE> primitive;
CallQueryInterface(child, (nsSVGFE**)getter_AddRefs(primitive));
if (primitive) {
return static_cast<SVGFilterElement *>(mContent);
}
}
AutoFilterReferencer filterRef(this);
nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
return next ? next->GetFilterContent(aDefault) :
static_cast<SVGFilterElement *>(aDefault);
}
nsSVGFilterFrame *
nsSVGFilterFrame::GetReferencedFilter()
{
if (mNoHRefURI)
return nullptr;
nsSVGPaintingProperty *property =
GetProperty(nsSVGEffects::HrefAsPaintingProperty());
if (!property) {
// Fetch our Filter element's href or xlink:href attribute
SVGFilterElement *filter = static_cast<SVGFilterElement *>(mContent);
nsAutoString href;
if (filter->mStringAttributes[SVGFilterElement::HREF].IsExplicitlySet()) {
filter->mStringAttributes[SVGFilterElement::HREF]
.GetAnimValue(href, filter);
} else {
filter->mStringAttributes[SVGFilterElement::XLINK_HREF]
.GetAnimValue(href, filter);
}
if (href.IsEmpty()) {
mNoHRefURI = true;
return nullptr; // no URL
}
// Convert href to an nsIURI
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = mContent->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
mContent->GetUncomposedDoc(), base);
property =
nsSVGEffects::GetPaintingProperty(targetURI, this,
nsSVGEffects::HrefAsPaintingProperty());
if (!property)
return nullptr;
}
nsIFrame *result = property->GetReferencedFrame();
if (!result)
return nullptr;
nsIAtom* frameType = result->GetType();
if (frameType != nsGkAtoms::svgFilterFrame)
return nullptr;
return static_cast<nsSVGFilterFrame*>(result);
}
nsSVGFilterFrame *
nsSVGFilterFrame::GetReferencedFilterIfNotInUse()
{
nsSVGFilterFrame *referenced = GetReferencedFilter();
if (!referenced)
return nullptr;
if (referenced->mLoopFlag) {
// XXXjwatt: we should really send an error to the JavaScript Console here:
NS_WARNING("Filter reference loop detected while inheriting attribute!");
return nullptr;
}
return referenced;
}
nsresult
nsSVGFilterFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* 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)) {
nsSVGEffects::InvalidateDirectRenderingObservers(this);
} else if ((aNameSpaceID == kNameSpaceID_XLink ||
aNameSpaceID == kNameSpaceID_None) &&
aAttribute == nsGkAtoms::href) {
// Blow away our reference, if any
DeleteProperty(nsSVGEffects::HrefAsPaintingProperty());
mNoHRefURI = false;
// And update whoever references us
nsSVGEffects::InvalidateDirectRenderingObservers(this);
}
return nsSVGContainerFrame::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
}
#ifdef DEBUG
void
nsSVGFilterFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::filter),
"Content is not an SVG filter");
nsSVGContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsIAtom *
nsSVGFilterFrame::GetType() const
{
return nsGkAtoms::svgFilterFrame;
}
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