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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /layout/svg/nsSVGGradientFrame.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'layout/svg/nsSVGGradientFrame.cpp')
-rw-r--r--layout/svg/nsSVGGradientFrame.cpp678
1 files changed, 678 insertions, 0 deletions
diff --git a/layout/svg/nsSVGGradientFrame.cpp b/layout/svg/nsSVGGradientFrame.cpp
new file mode 100644
index 000000000..217ab8c4a
--- /dev/null
+++ b/layout/svg/nsSVGGradientFrame.cpp
@@ -0,0 +1,678 @@
+/* -*- 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 "nsSVGGradientFrame.h"
+#include <algorithm>
+
+// Keep others in (case-insensitive) order:
+#include "gfxPattern.h"
+#include "mozilla/dom/SVGGradientElement.h"
+#include "mozilla/dom/SVGStopElement.h"
+#include "nsContentUtils.h"
+#include "nsSVGEffects.h"
+#include "nsSVGAnimatedTransformList.h"
+
+// XXX Tight coupling with content classes ahead!
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::gfx;
+
+//----------------------------------------------------------------------
+// Helper classes
+
+class MOZ_RAII nsSVGGradientFrame::AutoGradientReferencer
+{
+public:
+ explicit AutoGradientReferencer(nsSVGGradientFrame *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;
+ }
+ ~AutoGradientReferencer() {
+ mFrame->mLoopFlag = false;
+ }
+private:
+ nsSVGGradientFrame *mFrame;
+ MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+};
+
+//----------------------------------------------------------------------
+// Implementation
+
+nsSVGGradientFrame::nsSVGGradientFrame(nsStyleContext* aContext)
+ : nsSVGPaintServerFrame(aContext)
+ , mLoopFlag(false)
+ , mNoHRefURI(false)
+{
+}
+
+//----------------------------------------------------------------------
+// nsIFrame methods:
+
+nsresult
+nsSVGGradientFrame::AttributeChanged(int32_t aNameSpaceID,
+ nsIAtom* aAttribute,
+ int32_t aModType)
+{
+ if (aNameSpaceID == kNameSpaceID_None &&
+ (aAttribute == nsGkAtoms::gradientUnits ||
+ aAttribute == nsGkAtoms::gradientTransform ||
+ aAttribute == nsGkAtoms::spreadMethod)) {
+ nsSVGEffects::InvalidateDirectRenderingObservers(this);
+ } else if ((aNameSpaceID == kNameSpaceID_XLink ||
+ aNameSpaceID == kNameSpaceID_None) &&
+ aAttribute == nsGkAtoms::href) {
+ // Blow away our reference, if any
+ Properties().Delete(nsSVGEffects::HrefAsPaintingProperty());
+ mNoHRefURI = false;
+ // And update whoever references us
+ nsSVGEffects::InvalidateDirectRenderingObservers(this);
+ }
+
+ return nsSVGPaintServerFrame::AttributeChanged(aNameSpaceID,
+ aAttribute, aModType);
+}
+
+//----------------------------------------------------------------------
+
+uint16_t
+nsSVGGradientFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
+{
+ const nsSVGEnum& thisEnum =
+ static_cast<dom::SVGGradientElement*>(mContent)->mEnumAttributes[aIndex];
+
+ if (thisEnum.IsExplicitlySet())
+ return thisEnum.GetAnimValue();
+
+ AutoGradientReferencer gradientRef(this);
+
+ nsSVGGradientFrame *next = GetReferencedGradientIfNotInUse();
+ return next ? next->GetEnumValue(aIndex, aDefault) :
+ static_cast<dom::SVGGradientElement*>(aDefault)->
+ mEnumAttributes[aIndex].GetAnimValue();
+}
+
+uint16_t
+nsSVGGradientFrame::GetGradientUnits()
+{
+ // This getter is called every time the others are called - maybe cache it?
+ return GetEnumValue(dom::SVGGradientElement::GRADIENTUNITS);
+}
+
+uint16_t
+nsSVGGradientFrame::GetSpreadMethod()
+{
+ return GetEnumValue(dom::SVGGradientElement::SPREADMETHOD);
+}
+
+const nsSVGAnimatedTransformList*
+nsSVGGradientFrame::GetGradientTransformList(nsIContent* aDefault)
+{
+ nsSVGAnimatedTransformList *thisTransformList =
+ static_cast<dom::SVGGradientElement*>(mContent)->GetAnimatedTransformList();
+
+ if (thisTransformList && thisTransformList->IsExplicitlySet())
+ return thisTransformList;
+
+ AutoGradientReferencer gradientRef(this);
+
+ nsSVGGradientFrame *next = GetReferencedGradientIfNotInUse();
+ return next ? next->GetGradientTransformList(aDefault) :
+ static_cast<const dom::SVGGradientElement*>(aDefault)
+ ->mGradientTransform.get();
+}
+
+gfxMatrix
+nsSVGGradientFrame::GetGradientTransform(nsIFrame *aSource,
+ const gfxRect *aOverrideBounds)
+{
+ gfxMatrix bboxMatrix;
+
+ uint16_t gradientUnits = GetGradientUnits();
+ if (gradientUnits != SVG_UNIT_TYPE_USERSPACEONUSE) {
+ NS_ASSERTION(gradientUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX,
+ "Unknown gradientUnits type");
+ // objectBoundingBox is the default anyway
+
+ gfxRect bbox =
+ aOverrideBounds ? *aOverrideBounds : nsSVGUtils::GetBBox(aSource);
+ bboxMatrix =
+ gfxMatrix(bbox.Width(), 0, 0, bbox.Height(), bbox.X(), bbox.Y());
+ }
+
+ const nsSVGAnimatedTransformList* animTransformList =
+ GetGradientTransformList(mContent);
+ if (!animTransformList)
+ return bboxMatrix;
+
+ gfxMatrix gradientTransform =
+ animTransformList->GetAnimValue().GetConsolidationMatrix();
+ return bboxMatrix.PreMultiply(gradientTransform);
+}
+
+dom::SVGLinearGradientElement*
+nsSVGGradientFrame::GetLinearGradientWithLength(uint32_t aIndex,
+ dom::SVGLinearGradientElement* aDefault)
+{
+ // If this was a linear gradient with the required length, we would have
+ // already found it in nsSVGLinearGradientFrame::GetLinearGradientWithLength.
+ // Since we didn't find the length, continue looking down the chain.
+
+ AutoGradientReferencer gradientRef(this);
+
+ nsSVGGradientFrame *next = GetReferencedGradientIfNotInUse();
+ return next ? next->GetLinearGradientWithLength(aIndex, aDefault) : aDefault;
+}
+
+dom::SVGRadialGradientElement*
+nsSVGGradientFrame::GetRadialGradientWithLength(uint32_t aIndex,
+ dom::SVGRadialGradientElement* aDefault)
+{
+ // If this was a radial gradient with the required length, we would have
+ // already found it in nsSVGRadialGradientFrame::GetRadialGradientWithLength.
+ // Since we didn't find the length, continue looking down the chain.
+
+ AutoGradientReferencer gradientRef(this);
+
+ nsSVGGradientFrame *next = GetReferencedGradientIfNotInUse();
+ return next ? next->GetRadialGradientWithLength(aIndex, aDefault) : aDefault;
+}
+
+//----------------------------------------------------------------------
+// nsSVGPaintServerFrame methods:
+
+//helper
+static void GetStopInformation(nsIFrame* aStopFrame,
+ float *aOffset,
+ nscolor *aStopColor,
+ float *aStopOpacity)
+{
+ nsIContent* stopContent = aStopFrame->GetContent();
+ MOZ_ASSERT(stopContent && stopContent->IsSVGElement(nsGkAtoms::stop));
+
+ static_cast<SVGStopElement*>(stopContent)->
+ GetAnimatedNumberValues(aOffset, nullptr);
+
+ *aOffset = mozilla::clamped(*aOffset, 0.0f, 1.0f);
+ *aStopColor = aStopFrame->StyleSVGReset()->mStopColor;
+ *aStopOpacity = aStopFrame->StyleSVGReset()->mStopOpacity;
+}
+
+already_AddRefed<gfxPattern>
+nsSVGGradientFrame::GetPaintServerPattern(nsIFrame* aSource,
+ const DrawTarget* aDrawTarget,
+ const gfxMatrix& aContextMatrix,
+ nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
+ float aGraphicOpacity,
+ const gfxRect* aOverrideBounds)
+{
+ uint16_t gradientUnits = GetGradientUnits();
+ MOZ_ASSERT(gradientUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX ||
+ gradientUnits == SVG_UNIT_TYPE_USERSPACEONUSE);
+ if (gradientUnits == SVG_UNIT_TYPE_USERSPACEONUSE) {
+ // Set mSource for this consumer.
+ // If this gradient is applied to text, our caller will be the glyph, which
+ // is not an element, so we need to get the parent
+ mSource = aSource->GetContent()->IsNodeOfType(nsINode::eTEXT) ?
+ aSource->GetParent() : aSource;
+ }
+
+ AutoTArray<nsIFrame*,8> stopFrames;
+ GetStopFrames(&stopFrames);
+
+ uint32_t nStops = stopFrames.Length();
+
+ // SVG specification says that no stops should be treated like
+ // the corresponding fill or stroke had "none" specified.
+ if (nStops == 0) {
+ RefPtr<gfxPattern> pattern = new gfxPattern(Color());
+ return pattern.forget();
+ }
+
+ if (nStops == 1 || GradientVectorLengthIsZero()) {
+ // The gradient paints a single colour, using the stop-color of the last
+ // gradient step if there are more than one.
+ float stopOpacity = stopFrames[nStops-1]->StyleSVGReset()->mStopOpacity;
+ nscolor stopColor = stopFrames[nStops-1]->StyleSVGReset()->mStopColor;
+
+ Color stopColor2 = Color::FromABGR(stopColor);
+ stopColor2.a *= stopOpacity * aGraphicOpacity;
+ RefPtr<gfxPattern> pattern = new gfxPattern(stopColor2);
+ return pattern.forget();
+ }
+
+ // Get the transform list (if there is one). We do this after the returns
+ // above since this call can be expensive when "gradientUnits" is set to
+ // "objectBoundingBox" (since that requiring a GetBBox() call).
+ gfxMatrix patternMatrix = GetGradientTransform(aSource, aOverrideBounds);
+
+ if (patternMatrix.IsSingular()) {
+ return nullptr;
+ }
+
+ // revert any vector effect transform so that the gradient appears unchanged
+ if (aFillOrStroke == &nsStyleSVG::mStroke) {
+ gfxMatrix userToOuterSVG;
+ if (nsSVGUtils::GetNonScalingStrokeTransform(aSource, &userToOuterSVG)) {
+ patternMatrix *= userToOuterSVG;
+ }
+ }
+
+ if (!patternMatrix.Invert()) {
+ return nullptr;
+ }
+
+ RefPtr<gfxPattern> gradient = CreateGradient();
+ if (!gradient || gradient->CairoStatus())
+ return nullptr;
+
+ uint16_t aSpread = GetSpreadMethod();
+ if (aSpread == SVG_SPREADMETHOD_PAD)
+ gradient->SetExtend(ExtendMode::CLAMP);
+ else if (aSpread == SVG_SPREADMETHOD_REFLECT)
+ gradient->SetExtend(ExtendMode::REFLECT);
+ else if (aSpread == SVG_SPREADMETHOD_REPEAT)
+ gradient->SetExtend(ExtendMode::REPEAT);
+
+ gradient->SetMatrix(patternMatrix);
+
+ // setup stops
+ float lastOffset = 0.0f;
+
+ for (uint32_t i = 0; i < nStops; i++) {
+ float offset, stopOpacity;
+ nscolor stopColor;
+
+ GetStopInformation(stopFrames[i], &offset, &stopColor, &stopOpacity);
+
+ if (offset < lastOffset)
+ offset = lastOffset;
+ else
+ lastOffset = offset;
+
+ Color stopColor2 = Color::FromABGR(stopColor);
+ stopColor2.a *= stopOpacity * aGraphicOpacity;
+ gradient->AddColorStop(offset, stopColor2);
+ }
+
+ return gradient.forget();
+}
+
+// Private (helper) methods
+
+nsSVGGradientFrame *
+nsSVGGradientFrame::GetReferencedGradient()
+{
+ if (mNoHRefURI)
+ return nullptr;
+
+ nsSVGPaintingProperty *property =
+ Properties().Get(nsSVGEffects::HrefAsPaintingProperty());
+
+ if (!property) {
+ // Fetch our gradient element's href or xlink:href attribute
+ dom::SVGGradientElement* grad =
+ static_cast<dom::SVGGradientElement*>(mContent);
+ nsAutoString href;
+ if (grad->mStringAttributes[dom::SVGGradientElement::HREF]
+ .IsExplicitlySet()) {
+ grad->mStringAttributes[dom::SVGGradientElement::HREF]
+ .GetAnimValue(href, grad);
+ } else {
+ grad->mStringAttributes[dom::SVGGradientElement::XLINK_HREF]
+ .GetAnimValue(href, grad);
+ }
+
+ 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::svgLinearGradientFrame &&
+ frameType != nsGkAtoms::svgRadialGradientFrame)
+ return nullptr;
+
+ return static_cast<nsSVGGradientFrame*>(result);
+}
+
+nsSVGGradientFrame *
+nsSVGGradientFrame::GetReferencedGradientIfNotInUse()
+{
+ nsSVGGradientFrame *referenced = GetReferencedGradient();
+ if (!referenced)
+ return nullptr;
+
+ if (referenced->mLoopFlag) {
+ // XXXjwatt: we should really send an error to the JavaScript Console here:
+ NS_WARNING("gradient reference loop detected while inheriting attribute!");
+ return nullptr;
+ }
+
+ return referenced;
+}
+
+void
+nsSVGGradientFrame::GetStopFrames(nsTArray<nsIFrame*>* aStopFrames)
+{
+ nsIFrame *stopFrame = nullptr;
+ for (stopFrame = mFrames.FirstChild(); stopFrame;
+ stopFrame = stopFrame->GetNextSibling()) {
+ if (stopFrame->GetType() == nsGkAtoms::svgStopFrame) {
+ aStopFrames->AppendElement(stopFrame);
+ }
+ }
+ if (aStopFrames->Length() > 0) {
+ return;
+ }
+
+ // Our gradient element doesn't have stops - try to "inherit" them
+
+ AutoGradientReferencer gradientRef(this);
+ nsSVGGradientFrame* next = GetReferencedGradientIfNotInUse();
+ if (!next) {
+ return;
+ }
+
+ return next->GetStopFrames(aStopFrames);
+}
+
+// -------------------------------------------------------------------------
+// Linear Gradients
+// -------------------------------------------------------------------------
+
+#ifdef DEBUG
+void
+nsSVGLinearGradientFrame::Init(nsIContent* aContent,
+ nsContainerFrame* aParent,
+ nsIFrame* aPrevInFlow)
+{
+ NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::linearGradient),
+ "Content is not an SVG linearGradient");
+
+ nsSVGGradientFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsIAtom*
+nsSVGLinearGradientFrame::GetType() const
+{
+ return nsGkAtoms::svgLinearGradientFrame;
+}
+
+nsresult
+nsSVGLinearGradientFrame::AttributeChanged(int32_t aNameSpaceID,
+ nsIAtom* aAttribute,
+ int32_t aModType)
+{
+ if (aNameSpaceID == kNameSpaceID_None &&
+ (aAttribute == nsGkAtoms::x1 ||
+ aAttribute == nsGkAtoms::y1 ||
+ aAttribute == nsGkAtoms::x2 ||
+ aAttribute == nsGkAtoms::y2)) {
+ nsSVGEffects::InvalidateDirectRenderingObservers(this);
+ }
+
+ return nsSVGGradientFrame::AttributeChanged(aNameSpaceID,
+ aAttribute, aModType);
+}
+
+//----------------------------------------------------------------------
+
+float
+nsSVGLinearGradientFrame::GetLengthValue(uint32_t aIndex)
+{
+ dom::SVGLinearGradientElement* lengthElement =
+ GetLinearGradientWithLength(aIndex,
+ static_cast<dom::SVGLinearGradientElement*>(mContent));
+ // We passed in mContent as a fallback, so, assuming mContent is non-null, the
+ // return value should also be non-null.
+ MOZ_ASSERT(lengthElement,
+ "Got unexpected null element from GetLinearGradientWithLength");
+ const nsSVGLength2 &length = lengthElement->mLengthAttributes[aIndex];
+
+ // Object bounding box units are handled by setting the appropriate
+ // transform in GetGradientTransform, but we need to handle user
+ // space units as part of the individual Get* routines. Fixes 323669.
+
+ uint16_t gradientUnits = GetGradientUnits();
+ if (gradientUnits == SVG_UNIT_TYPE_USERSPACEONUSE) {
+ return nsSVGUtils::UserSpace(mSource, &length);
+ }
+
+ NS_ASSERTION(
+ gradientUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX,
+ "Unknown gradientUnits type");
+
+ return length.GetAnimValue(static_cast<SVGSVGElement*>(nullptr));
+}
+
+dom::SVGLinearGradientElement*
+nsSVGLinearGradientFrame::GetLinearGradientWithLength(uint32_t aIndex,
+ dom::SVGLinearGradientElement* aDefault)
+{
+ dom::SVGLinearGradientElement* thisElement =
+ static_cast<dom::SVGLinearGradientElement*>(mContent);
+ const nsSVGLength2 &length = thisElement->mLengthAttributes[aIndex];
+
+ if (length.IsExplicitlySet()) {
+ return thisElement;
+ }
+
+ return nsSVGGradientFrame::GetLinearGradientWithLength(aIndex, aDefault);
+}
+
+bool
+nsSVGLinearGradientFrame::GradientVectorLengthIsZero()
+{
+ return GetLengthValue(dom::SVGLinearGradientElement::ATTR_X1) ==
+ GetLengthValue(dom::SVGLinearGradientElement::ATTR_X2) &&
+ GetLengthValue(dom::SVGLinearGradientElement::ATTR_Y1) ==
+ GetLengthValue(dom::SVGLinearGradientElement::ATTR_Y2);
+}
+
+already_AddRefed<gfxPattern>
+nsSVGLinearGradientFrame::CreateGradient()
+{
+ float x1, y1, x2, y2;
+
+ x1 = GetLengthValue(dom::SVGLinearGradientElement::ATTR_X1);
+ y1 = GetLengthValue(dom::SVGLinearGradientElement::ATTR_Y1);
+ x2 = GetLengthValue(dom::SVGLinearGradientElement::ATTR_X2);
+ y2 = GetLengthValue(dom::SVGLinearGradientElement::ATTR_Y2);
+
+ RefPtr<gfxPattern> pattern = new gfxPattern(x1, y1, x2, y2);
+ return pattern.forget();
+}
+
+// -------------------------------------------------------------------------
+// Radial Gradients
+// -------------------------------------------------------------------------
+
+#ifdef DEBUG
+void
+nsSVGRadialGradientFrame::Init(nsIContent* aContent,
+ nsContainerFrame* aParent,
+ nsIFrame* aPrevInFlow)
+{
+ NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::radialGradient),
+ "Content is not an SVG radialGradient");
+
+ nsSVGGradientFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsIAtom*
+nsSVGRadialGradientFrame::GetType() const
+{
+ return nsGkAtoms::svgRadialGradientFrame;
+}
+
+nsresult
+nsSVGRadialGradientFrame::AttributeChanged(int32_t aNameSpaceID,
+ nsIAtom* aAttribute,
+ int32_t aModType)
+{
+ if (aNameSpaceID == kNameSpaceID_None &&
+ (aAttribute == nsGkAtoms::r ||
+ aAttribute == nsGkAtoms::cx ||
+ aAttribute == nsGkAtoms::cy ||
+ aAttribute == nsGkAtoms::fx ||
+ aAttribute == nsGkAtoms::fy)) {
+ nsSVGEffects::InvalidateDirectRenderingObservers(this);
+ }
+
+ return nsSVGGradientFrame::AttributeChanged(aNameSpaceID,
+ aAttribute, aModType);
+}
+
+//----------------------------------------------------------------------
+
+float
+nsSVGRadialGradientFrame::GetLengthValue(uint32_t aIndex)
+{
+ dom::SVGRadialGradientElement* lengthElement =
+ GetRadialGradientWithLength(aIndex,
+ static_cast<dom::SVGRadialGradientElement*>(mContent));
+ // We passed in mContent as a fallback, so, assuming mContent is non-null,
+ // the return value should also be non-null.
+ MOZ_ASSERT(lengthElement,
+ "Got unexpected null element from GetRadialGradientWithLength");
+ return GetLengthValueFromElement(aIndex, *lengthElement);
+}
+
+float
+nsSVGRadialGradientFrame::GetLengthValue(uint32_t aIndex, float aDefaultValue)
+{
+ dom::SVGRadialGradientElement* lengthElement =
+ GetRadialGradientWithLength(aIndex, nullptr);
+
+ return lengthElement ? GetLengthValueFromElement(aIndex, *lengthElement)
+ : aDefaultValue;
+}
+
+float
+nsSVGRadialGradientFrame::GetLengthValueFromElement(uint32_t aIndex,
+ dom::SVGRadialGradientElement& aElement)
+{
+ const nsSVGLength2 &length = aElement.mLengthAttributes[aIndex];
+
+ // Object bounding box units are handled by setting the appropriate
+ // transform in GetGradientTransform, but we need to handle user
+ // space units as part of the individual Get* routines. Fixes 323669.
+
+ uint16_t gradientUnits = GetGradientUnits();
+ if (gradientUnits == SVG_UNIT_TYPE_USERSPACEONUSE) {
+ return nsSVGUtils::UserSpace(mSource, &length);
+ }
+
+ NS_ASSERTION(
+ gradientUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX,
+ "Unknown gradientUnits type");
+
+ return length.GetAnimValue(static_cast<SVGSVGElement*>(nullptr));
+}
+
+dom::SVGRadialGradientElement*
+nsSVGRadialGradientFrame::GetRadialGradientWithLength(uint32_t aIndex,
+ dom::SVGRadialGradientElement* aDefault)
+{
+ dom::SVGRadialGradientElement* thisElement =
+ static_cast<dom::SVGRadialGradientElement*>(mContent);
+ const nsSVGLength2 &length = thisElement->mLengthAttributes[aIndex];
+
+ if (length.IsExplicitlySet()) {
+ return thisElement;
+ }
+
+ return nsSVGGradientFrame::GetRadialGradientWithLength(aIndex, aDefault);
+}
+
+bool
+nsSVGRadialGradientFrame::GradientVectorLengthIsZero()
+{
+ return GetLengthValue(dom::SVGRadialGradientElement::ATTR_R) == 0;
+}
+
+already_AddRefed<gfxPattern>
+nsSVGRadialGradientFrame::CreateGradient()
+{
+ float cx, cy, r, fx, fy;
+
+ cx = GetLengthValue(dom::SVGRadialGradientElement::ATTR_CX);
+ cy = GetLengthValue(dom::SVGRadialGradientElement::ATTR_CY);
+ r = GetLengthValue(dom::SVGRadialGradientElement::ATTR_R);
+ // If fx or fy are not set, use cx/cy instead
+ fx = GetLengthValue(dom::SVGRadialGradientElement::ATTR_FX, cx);
+ fy = GetLengthValue(dom::SVGRadialGradientElement::ATTR_FY, cy);
+
+ if (fx != cx || fy != cy) {
+ // The focal point (fFx and fFy) must be clamped to be *inside* - not on -
+ // the circumference of the gradient or we'll get rendering anomalies. We
+ // calculate the distance from the focal point to the gradient center and
+ // make sure it is *less* than the gradient radius.
+ // 1/128 is the limit of the fractional part of cairo's 24.8 fixed point
+ // representation divided by 2 to ensure that we get different cairo
+ // fractions
+ double dMax = std::max(0.0, r - 1.0/128);
+ float dx = fx - cx;
+ float dy = fy - cy;
+ double d = sqrt((dx * dx) + (dy * dy));
+ if (d > dMax) {
+ double angle = atan2(dy, dx);
+ fx = (float)(dMax * cos(angle)) + cx;
+ fy = (float)(dMax * sin(angle)) + cy;
+ }
+ }
+
+ RefPtr<gfxPattern> pattern = new gfxPattern(fx, fy, 0, cx, cy, r);
+ return pattern.forget();
+}
+
+// -------------------------------------------------------------------------
+// Public functions
+// -------------------------------------------------------------------------
+
+nsIFrame*
+NS_NewSVGLinearGradientFrame(nsIPresShell* aPresShell,
+ nsStyleContext* aContext)
+{
+ return new (aPresShell) nsSVGLinearGradientFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsSVGLinearGradientFrame)
+
+nsIFrame*
+NS_NewSVGRadialGradientFrame(nsIPresShell* aPresShell,
+ nsStyleContext* aContext)
+{
+ return new (aPresShell) nsSVGRadialGradientFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsSVGRadialGradientFrame)