1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/svg/nsSVGFilterFrame.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,205 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +// Main header first:
1.10 +#include "nsSVGFilterFrame.h"
1.11 +
1.12 +// Keep others in (case-insensitive) order:
1.13 +#include "gfxUtils.h"
1.14 +#include "nsGkAtoms.h"
1.15 +#include "nsRenderingContext.h"
1.16 +#include "nsSVGEffects.h"
1.17 +#include "nsSVGElement.h"
1.18 +#include "mozilla/dom/SVGFilterElement.h"
1.19 +#include "nsSVGFilterInstance.h"
1.20 +#include "nsSVGFilterPaintCallback.h"
1.21 +#include "nsSVGIntegrationUtils.h"
1.22 +#include "nsSVGUtils.h"
1.23 +#include "nsContentUtils.h"
1.24 +
1.25 +using namespace mozilla::dom;
1.26 +
1.27 +nsIFrame*
1.28 +NS_NewSVGFilterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
1.29 +{
1.30 + return new (aPresShell) nsSVGFilterFrame(aContext);
1.31 +}
1.32 +
1.33 +NS_IMPL_FRAMEARENA_HELPERS(nsSVGFilterFrame)
1.34 +
1.35 +class MOZ_STACK_CLASS nsSVGFilterFrame::AutoFilterReferencer
1.36 +{
1.37 +public:
1.38 + AutoFilterReferencer(nsSVGFilterFrame *aFrame MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
1.39 + : mFrame(aFrame)
1.40 + {
1.41 + MOZ_GUARD_OBJECT_NOTIFIER_INIT;
1.42 + // Reference loops should normally be detected in advance and handled, so
1.43 + // we're not expecting to encounter them here
1.44 + NS_ABORT_IF_FALSE(!mFrame->mLoopFlag, "Undetected reference loop!");
1.45 + mFrame->mLoopFlag = true;
1.46 + }
1.47 + ~AutoFilterReferencer() {
1.48 + mFrame->mLoopFlag = false;
1.49 + }
1.50 +private:
1.51 + nsSVGFilterFrame *mFrame;
1.52 + MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
1.53 +};
1.54 +
1.55 +uint16_t
1.56 +nsSVGFilterFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
1.57 +{
1.58 + nsSVGEnum& thisEnum =
1.59 + static_cast<SVGFilterElement *>(mContent)->mEnumAttributes[aIndex];
1.60 +
1.61 + if (thisEnum.IsExplicitlySet())
1.62 + return thisEnum.GetAnimValue();
1.63 +
1.64 + AutoFilterReferencer filterRef(this);
1.65 +
1.66 + nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
1.67 + return next ? next->GetEnumValue(aIndex, aDefault) :
1.68 + static_cast<SVGFilterElement *>(aDefault)->
1.69 + mEnumAttributes[aIndex].GetAnimValue();
1.70 +}
1.71 +
1.72 +const nsSVGLength2 *
1.73 +nsSVGFilterFrame::GetLengthValue(uint32_t aIndex, nsIContent *aDefault)
1.74 +{
1.75 + const nsSVGLength2 *thisLength =
1.76 + &static_cast<SVGFilterElement *>(mContent)->mLengthAttributes[aIndex];
1.77 +
1.78 + if (thisLength->IsExplicitlySet())
1.79 + return thisLength;
1.80 +
1.81 + AutoFilterReferencer filterRef(this);
1.82 +
1.83 + nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
1.84 + return next ? next->GetLengthValue(aIndex, aDefault) :
1.85 + &static_cast<SVGFilterElement *>(aDefault)->mLengthAttributes[aIndex];
1.86 +}
1.87 +
1.88 +const SVGFilterElement *
1.89 +nsSVGFilterFrame::GetFilterContent(nsIContent *aDefault)
1.90 +{
1.91 + for (nsIContent* child = mContent->GetFirstChild();
1.92 + child;
1.93 + child = child->GetNextSibling()) {
1.94 + nsRefPtr<nsSVGFE> primitive;
1.95 + CallQueryInterface(child, (nsSVGFE**)getter_AddRefs(primitive));
1.96 + if (primitive) {
1.97 + return static_cast<SVGFilterElement *>(mContent);
1.98 + }
1.99 + }
1.100 +
1.101 + AutoFilterReferencer filterRef(this);
1.102 +
1.103 + nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
1.104 + return next ? next->GetFilterContent(aDefault) :
1.105 + static_cast<SVGFilterElement *>(aDefault);
1.106 +}
1.107 +
1.108 +nsSVGFilterFrame *
1.109 +nsSVGFilterFrame::GetReferencedFilter()
1.110 +{
1.111 + if (mNoHRefURI)
1.112 + return nullptr;
1.113 +
1.114 + nsSVGPaintingProperty *property = static_cast<nsSVGPaintingProperty*>
1.115 + (Properties().Get(nsSVGEffects::HrefProperty()));
1.116 +
1.117 + if (!property) {
1.118 + // Fetch our Filter element's xlink:href attribute
1.119 + SVGFilterElement *filter = static_cast<SVGFilterElement *>(mContent);
1.120 + nsAutoString href;
1.121 + filter->mStringAttributes[SVGFilterElement::HREF].GetAnimValue(href, filter);
1.122 + if (href.IsEmpty()) {
1.123 + mNoHRefURI = true;
1.124 + return nullptr; // no URL
1.125 + }
1.126 +
1.127 + // Convert href to an nsIURI
1.128 + nsCOMPtr<nsIURI> targetURI;
1.129 + nsCOMPtr<nsIURI> base = mContent->GetBaseURI();
1.130 + nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
1.131 + mContent->GetCurrentDoc(), base);
1.132 +
1.133 + property =
1.134 + nsSVGEffects::GetPaintingProperty(targetURI, this, nsSVGEffects::HrefProperty());
1.135 + if (!property)
1.136 + return nullptr;
1.137 + }
1.138 +
1.139 + nsIFrame *result = property->GetReferencedFrame();
1.140 + if (!result)
1.141 + return nullptr;
1.142 +
1.143 + nsIAtom* frameType = result->GetType();
1.144 + if (frameType != nsGkAtoms::svgFilterFrame)
1.145 + return nullptr;
1.146 +
1.147 + return static_cast<nsSVGFilterFrame*>(result);
1.148 +}
1.149 +
1.150 +nsSVGFilterFrame *
1.151 +nsSVGFilterFrame::GetReferencedFilterIfNotInUse()
1.152 +{
1.153 + nsSVGFilterFrame *referenced = GetReferencedFilter();
1.154 + if (!referenced)
1.155 + return nullptr;
1.156 +
1.157 + if (referenced->mLoopFlag) {
1.158 + // XXXjwatt: we should really send an error to the JavaScript Console here:
1.159 + NS_WARNING("Filter reference loop detected while inheriting attribute!");
1.160 + return nullptr;
1.161 + }
1.162 +
1.163 + return referenced;
1.164 +}
1.165 +
1.166 +nsresult
1.167 +nsSVGFilterFrame::AttributeChanged(int32_t aNameSpaceID,
1.168 + nsIAtom* aAttribute,
1.169 + int32_t aModType)
1.170 +{
1.171 + if (aNameSpaceID == kNameSpaceID_None &&
1.172 + (aAttribute == nsGkAtoms::x ||
1.173 + aAttribute == nsGkAtoms::y ||
1.174 + aAttribute == nsGkAtoms::width ||
1.175 + aAttribute == nsGkAtoms::height ||
1.176 + aAttribute == nsGkAtoms::filterUnits ||
1.177 + aAttribute == nsGkAtoms::primitiveUnits)) {
1.178 + nsSVGEffects::InvalidateDirectRenderingObservers(this);
1.179 + } else if (aNameSpaceID == kNameSpaceID_XLink &&
1.180 + aAttribute == nsGkAtoms::href) {
1.181 + // Blow away our reference, if any
1.182 + Properties().Delete(nsSVGEffects::HrefProperty());
1.183 + mNoHRefURI = false;
1.184 + // And update whoever references us
1.185 + nsSVGEffects::InvalidateDirectRenderingObservers(this);
1.186 + }
1.187 + return nsSVGFilterFrameBase::AttributeChanged(aNameSpaceID,
1.188 + aAttribute, aModType);
1.189 +}
1.190 +
1.191 +#ifdef DEBUG
1.192 +void
1.193 +nsSVGFilterFrame::Init(nsIContent* aContent,
1.194 + nsIFrame* aParent,
1.195 + nsIFrame* aPrevInFlow)
1.196 +{
1.197 + NS_ASSERTION(aContent->IsSVG(nsGkAtoms::filter),
1.198 + "Content is not an SVG filter");
1.199 +
1.200 + nsSVGFilterFrameBase::Init(aContent, aParent, aPrevInFlow);
1.201 +}
1.202 +#endif /* DEBUG */
1.203 +
1.204 +nsIAtom *
1.205 +nsSVGFilterFrame::GetType() const
1.206 +{
1.207 + return nsGkAtoms::svgFilterFrame;
1.208 +}
