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e74f1cd513
In order to facilitate the movement of code with side-effects called by Element::SetAttr to Element::BeforeSetAttr and Element::AfterSetAttr, Element::AfterSetAttr should have access to the old value of the attribute. This includes information about whether there was previously a value set or not. Accomplishing this involved passing an additional argument through functions that find and change the old attribute value in order to ensure that we can differentiate between an empty old value and an absent old value (attribute was not set). Note that while I tried to ensure that accurate values (and their absence) are reported to Element::AfterSetAttr, I largely ignored SVG. While the old value reported for SVG values should be however accurate the value already being reported to SetAttrAndNotify was, SVG elements do not currently report unset values properly because they will never pass a null pointer to SetAttrAndNotify. MozReview-Commit-ID: K1mha8CNFZP --HG-- extra : rebase_source : 42776eb01451d371e4aebcc17fe3dd112c8d268b
186 lines
5.1 KiB
C++
186 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SVGGeometryElement.h"
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#include "DOMSVGPoint.h"
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#include "gfxPlatform.h"
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#include "mozilla/gfx/2D.h"
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#include "nsComputedDOMStyle.h"
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#include "nsSVGUtils.h"
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#include "nsSVGLength2.h"
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#include "SVGContentUtils.h"
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using namespace mozilla;
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using namespace mozilla::gfx;
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nsSVGElement::NumberInfo SVGGeometryElement::sNumberInfo =
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{ &nsGkAtoms::pathLength, 0, false };
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//----------------------------------------------------------------------
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// Implementation
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SVGGeometryElement::SVGGeometryElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
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: SVGGeometryElementBase(aNodeInfo)
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{
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}
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nsSVGElement::NumberAttributesInfo
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SVGGeometryElement::GetNumberInfo()
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{
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return NumberAttributesInfo(&mPathLength, &sNumberInfo, 1);
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}
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nsresult
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SVGGeometryElement::AfterSetAttr(int32_t aNamespaceID, nsIAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue, bool aNotify)
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{
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if (mCachedPath &&
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aNamespaceID == kNameSpaceID_None &&
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AttributeDefinesGeometry(aName)) {
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mCachedPath = nullptr;
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}
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return SVGGeometryElementBase::AfterSetAttr(aNamespaceID, aName,
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aValue, aOldValue, aNotify);
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}
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bool
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SVGGeometryElement::AttributeDefinesGeometry(const nsIAtom *aName)
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{
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if (aName == nsGkAtoms::pathLength) {
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return true;
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}
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// Check for nsSVGLength2 attribute
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LengthAttributesInfo info = GetLengthInfo();
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for (uint32_t i = 0; i < info.mLengthCount; i++) {
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if (aName == *info.mLengthInfo[i].mName) {
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return true;
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}
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}
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return false;
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}
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bool
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SVGGeometryElement::GeometryDependsOnCoordCtx()
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{
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// Check the nsSVGLength2 attribute
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LengthAttributesInfo info = const_cast<SVGGeometryElement*>(this)->GetLengthInfo();
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for (uint32_t i = 0; i < info.mLengthCount; i++) {
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if (info.mLengths[i].GetSpecifiedUnitType() == nsIDOMSVGLength::SVG_LENGTHTYPE_PERCENTAGE) {
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return true;
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}
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}
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return false;
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}
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bool
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SVGGeometryElement::IsMarkable()
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{
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return false;
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}
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void
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SVGGeometryElement::GetMarkPoints(nsTArray<nsSVGMark> *aMarks)
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{
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}
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already_AddRefed<Path>
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SVGGeometryElement::GetOrBuildPath(const DrawTarget& aDrawTarget,
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FillRule aFillRule)
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{
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// We only cache the path if it matches the backend used for screen painting:
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bool cacheable = aDrawTarget.GetBackendType() ==
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gfxPlatform::GetPlatform()->GetDefaultContentBackend();
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// Checking for and returning mCachedPath before checking the pref means
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// that the pref is only live on page reload (or app restart for SVG in
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// chrome). The benefit is that we avoid causing a CPU memory cache miss by
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// looking at the global variable that the pref's stored in.
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if (cacheable && mCachedPath) {
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if (aDrawTarget.GetBackendType() == mCachedPath->GetBackendType()) {
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RefPtr<Path> path(mCachedPath);
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return path.forget();
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}
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}
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RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder(aFillRule);
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RefPtr<Path> path = BuildPath(builder);
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if (cacheable && NS_SVGPathCachingEnabled()) {
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mCachedPath = path;
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}
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return path.forget();
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}
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already_AddRefed<Path>
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SVGGeometryElement::GetOrBuildPathForMeasuring()
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{
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return nullptr;
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}
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FillRule
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SVGGeometryElement::GetFillRule()
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{
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FillRule fillRule = FillRule::FILL_WINDING; // Equivalent to StyleFillRule::Nonzero
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RefPtr<nsStyleContext> styleContext =
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nsComputedDOMStyle::GetStyleContextNoFlush(this, nullptr, nullptr);
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if (styleContext) {
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MOZ_ASSERT(styleContext->StyleSVG()->mFillRule == StyleFillRule::Nonzero ||
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styleContext->StyleSVG()->mFillRule == StyleFillRule::Evenodd);
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if (styleContext->StyleSVG()->mFillRule == StyleFillRule::Evenodd) {
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fillRule = FillRule::FILL_EVEN_ODD;
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}
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} else {
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// ReportToConsole
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NS_WARNING("Couldn't get style context for content in GetFillRule");
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}
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return fillRule;
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}
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float
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SVGGeometryElement::GetTotalLength()
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{
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RefPtr<Path> flat = GetOrBuildPathForMeasuring();
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return flat ? flat->ComputeLength() : 0.f;
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}
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already_AddRefed<nsISVGPoint>
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SVGGeometryElement::GetPointAtLength(float distance, ErrorResult& rv)
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{
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RefPtr<Path> path = GetOrBuildPathForMeasuring();
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if (!path) {
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rv.Throw(NS_ERROR_FAILURE);
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return nullptr;
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}
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float totalLength = path->ComputeLength();
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if (mPathLength.IsExplicitlySet()) {
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float pathLength = mPathLength.GetAnimValue();
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if (pathLength <= 0) {
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rv.Throw(NS_ERROR_FAILURE);
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return nullptr;
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}
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distance *= totalLength / pathLength;
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}
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distance = std::max(0.f, distance);
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distance = std::min(totalLength, distance);
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nsCOMPtr<nsISVGPoint> point =
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new DOMSVGPoint(path->ComputePointAtLength(distance));
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return point.forget();
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}
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already_AddRefed<SVGAnimatedNumber>
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SVGGeometryElement::PathLength()
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{
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return mPathLength.ToDOMAnimatedNumber(this);
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}
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