gecko-dev/dom/svg/SVGGeometryElement.cpp

189 строки
5.4 KiB
C++

/* -*- 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "SVGGeometryElement.h"
#include "DOMSVGPoint.h"
#include "gfxPlatform.h"
#include "mozilla/gfx/2D.h"
#include "nsComputedDOMStyle.h"
#include "nsSVGUtils.h"
#include "nsSVGLength2.h"
#include "SVGContentUtils.h"
using namespace mozilla;
using namespace mozilla::gfx;
nsSVGElement::NumberInfo SVGGeometryElement::sNumberInfo =
{ &nsGkAtoms::pathLength, 0, false };
//----------------------------------------------------------------------
// Implementation
SVGGeometryElement::SVGGeometryElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: SVGGeometryElementBase(aNodeInfo)
{
}
nsSVGElement::NumberAttributesInfo
SVGGeometryElement::GetNumberInfo()
{
return NumberAttributesInfo(&mPathLength, &sNumberInfo, 1);
}
nsresult
SVGGeometryElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aSubjectPrincipal,
bool aNotify)
{
if (mCachedPath &&
aNamespaceID == kNameSpaceID_None &&
AttributeDefinesGeometry(aName)) {
mCachedPath = nullptr;
}
return SVGGeometryElementBase::AfterSetAttr(aNamespaceID, aName,
aValue, aOldValue,
aSubjectPrincipal,
aNotify);
}
bool
SVGGeometryElement::AttributeDefinesGeometry(const nsAtom *aName)
{
if (aName == nsGkAtoms::pathLength) {
return true;
}
// Check for nsSVGLength2 attribute
LengthAttributesInfo info = GetLengthInfo();
for (uint32_t i = 0; i < info.mLengthCount; i++) {
if (aName == *info.mLengthInfo[i].mName) {
return true;
}
}
return false;
}
bool
SVGGeometryElement::GeometryDependsOnCoordCtx()
{
// Check the nsSVGLength2 attribute
LengthAttributesInfo info = const_cast<SVGGeometryElement*>(this)->GetLengthInfo();
for (uint32_t i = 0; i < info.mLengthCount; i++) {
if (info.mLengths[i].GetSpecifiedUnitType() == nsIDOMSVGLength::SVG_LENGTHTYPE_PERCENTAGE) {
return true;
}
}
return false;
}
bool
SVGGeometryElement::IsMarkable()
{
return false;
}
void
SVGGeometryElement::GetMarkPoints(nsTArray<nsSVGMark> *aMarks)
{
}
already_AddRefed<Path>
SVGGeometryElement::GetOrBuildPath(const DrawTarget& aDrawTarget,
FillRule aFillRule)
{
// We only cache the path if it matches the backend used for screen painting:
bool cacheable = aDrawTarget.GetBackendType() ==
gfxPlatform::GetPlatform()->GetDefaultContentBackend();
// Checking for and returning mCachedPath before checking the pref means
// that the pref is only live on page reload (or app restart for SVG in
// chrome). The benefit is that we avoid causing a CPU memory cache miss by
// looking at the global variable that the pref's stored in.
if (cacheable && mCachedPath && mCachedPath->GetFillRule() == aFillRule &&
aDrawTarget.GetBackendType() == mCachedPath->GetBackendType()) {
RefPtr<Path> path(mCachedPath);
return path.forget();
}
RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder(aFillRule);
RefPtr<Path> path = BuildPath(builder);
if (cacheable && NS_SVGPathCachingEnabled()) {
mCachedPath = path;
}
return path.forget();
}
already_AddRefed<Path>
SVGGeometryElement::GetOrBuildPathForMeasuring()
{
return nullptr;
}
FillRule
SVGGeometryElement::GetFillRule()
{
FillRule fillRule = FillRule::FILL_WINDING; // Equivalent to StyleFillRule::Nonzero
RefPtr<nsStyleContext> styleContext =
nsComputedDOMStyle::GetStyleContextNoFlush(this, nullptr, nullptr);
if (styleContext) {
MOZ_ASSERT(styleContext->StyleSVG()->mFillRule == StyleFillRule::Nonzero ||
styleContext->StyleSVG()->mFillRule == StyleFillRule::Evenodd);
if (styleContext->StyleSVG()->mFillRule == StyleFillRule::Evenodd) {
fillRule = FillRule::FILL_EVEN_ODD;
}
} else {
// ReportToConsole
NS_WARNING("Couldn't get style context for content in GetFillRule");
}
return fillRule;
}
float
SVGGeometryElement::GetTotalLength()
{
RefPtr<Path> flat = GetOrBuildPathForMeasuring();
return flat ? flat->ComputeLength() : 0.f;
}
already_AddRefed<nsISVGPoint>
SVGGeometryElement::GetPointAtLength(float distance, ErrorResult& rv)
{
RefPtr<Path> path = GetOrBuildPathForMeasuring();
if (!path) {
rv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
float totalLength = path->ComputeLength();
if (mPathLength.IsExplicitlySet()) {
float pathLength = mPathLength.GetAnimValue();
if (pathLength <= 0) {
rv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
distance *= totalLength / pathLength;
}
distance = std::max(0.f, distance);
distance = std::min(totalLength, distance);
nsCOMPtr<nsISVGPoint> point =
new DOMSVGPoint(path->ComputePointAtLength(distance));
return point.forget();
}
already_AddRefed<SVGAnimatedNumber>
SVGGeometryElement::PathLength()
{
return mPathLength.ToDOMAnimatedNumber(this);
}