зеркало из https://github.com/mozilla/gecko-dev.git
677 строки
23 KiB
C++
677 строки
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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// Main header first:
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#include "nsSVGGradientFrame.h"
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#include <algorithm>
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// Keep others in (case-insensitive) order:
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#include "AutoReferenceChainGuard.h"
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#include "gfxPattern.h"
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#include "mozilla/dom/SVGGradientElement.h"
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#include "mozilla/dom/SVGStopElement.h"
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#include "nsContentUtils.h"
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#include "nsSVGEffects.h"
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#include "nsSVGAnimatedTransformList.h"
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// XXX Tight coupling with content classes ahead!
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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//----------------------------------------------------------------------
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// Implementation
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nsSVGGradientFrame::nsSVGGradientFrame(nsStyleContext* aContext,
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LayoutFrameType aType)
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: nsSVGPaintServerFrame(aContext, aType)
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, mLoopFlag(false)
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, mNoHRefURI(false)
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{
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}
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//----------------------------------------------------------------------
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// nsIFrame methods:
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nsresult
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nsSVGGradientFrame::AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType)
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{
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if (aNameSpaceID == kNameSpaceID_None &&
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(aAttribute == nsGkAtoms::gradientUnits ||
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aAttribute == nsGkAtoms::gradientTransform ||
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aAttribute == nsGkAtoms::spreadMethod)) {
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nsSVGEffects::InvalidateDirectRenderingObservers(this);
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} else if ((aNameSpaceID == kNameSpaceID_XLink ||
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aNameSpaceID == kNameSpaceID_None) &&
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aAttribute == nsGkAtoms::href) {
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// Blow away our reference, if any
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Properties().Delete(nsSVGEffects::HrefAsPaintingProperty());
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mNoHRefURI = false;
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// And update whoever references us
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nsSVGEffects::InvalidateDirectRenderingObservers(this);
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}
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return nsSVGPaintServerFrame::AttributeChanged(aNameSpaceID,
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aAttribute, aModType);
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}
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//----------------------------------------------------------------------
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uint16_t
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nsSVGGradientFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
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{
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const nsSVGEnum& thisEnum =
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static_cast<dom::SVGGradientElement*>(mContent)->mEnumAttributes[aIndex];
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if (thisEnum.IsExplicitlySet())
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return thisEnum.GetAnimValue();
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// Before we recurse, make sure we'll break reference loops and over long
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// reference chains:
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static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
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AutoReferenceChainGuard refChainGuard(this, &mLoopFlag,
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&sRefChainLengthCounter);
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if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
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// Break reference chain
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return static_cast<dom::SVGGradientElement*>(aDefault)->
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mEnumAttributes[aIndex].GetAnimValue();
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}
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nsSVGGradientFrame *next = GetReferencedGradient();
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return next ? next->GetEnumValue(aIndex, aDefault)
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: static_cast<dom::SVGGradientElement*>(aDefault)->
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mEnumAttributes[aIndex].GetAnimValue();
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}
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uint16_t
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nsSVGGradientFrame::GetGradientUnits()
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{
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// This getter is called every time the others are called - maybe cache it?
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return GetEnumValue(dom::SVGGradientElement::GRADIENTUNITS);
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}
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uint16_t
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nsSVGGradientFrame::GetSpreadMethod()
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{
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return GetEnumValue(dom::SVGGradientElement::SPREADMETHOD);
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}
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const nsSVGAnimatedTransformList*
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nsSVGGradientFrame::GetGradientTransformList(nsIContent* aDefault)
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{
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nsSVGAnimatedTransformList *thisTransformList =
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static_cast<dom::SVGGradientElement*>(mContent)->GetAnimatedTransformList();
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if (thisTransformList && thisTransformList->IsExplicitlySet())
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return thisTransformList;
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// Before we recurse, make sure we'll break reference loops and over long
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// reference chains:
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static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
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AutoReferenceChainGuard refChainGuard(this, &mLoopFlag,
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&sRefChainLengthCounter);
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if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
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// Break reference chain
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return static_cast<const dom::SVGGradientElement*>(aDefault)->
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mGradientTransform.get();
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}
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nsSVGGradientFrame *next = GetReferencedGradient();
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return next ? next->GetGradientTransformList(aDefault)
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: static_cast<const dom::SVGGradientElement*>(aDefault)->
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mGradientTransform.get();
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}
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gfxMatrix
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nsSVGGradientFrame::GetGradientTransform(nsIFrame *aSource,
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const gfxRect *aOverrideBounds)
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{
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gfxMatrix bboxMatrix;
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uint16_t gradientUnits = GetGradientUnits();
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if (gradientUnits != SVG_UNIT_TYPE_USERSPACEONUSE) {
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NS_ASSERTION(gradientUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX,
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"Unknown gradientUnits type");
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// objectBoundingBox is the default anyway
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gfxRect bbox =
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aOverrideBounds
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? *aOverrideBounds
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: nsSVGUtils::GetBBox(aSource, nsSVGUtils::eUseFrameBoundsForOuterSVG |
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nsSVGUtils::eBBoxIncludeFillGeometry);
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bboxMatrix =
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gfxMatrix(bbox.Width(), 0, 0, bbox.Height(), bbox.X(), bbox.Y());
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}
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const nsSVGAnimatedTransformList* animTransformList =
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GetGradientTransformList(mContent);
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if (!animTransformList)
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return bboxMatrix;
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gfxMatrix gradientTransform =
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animTransformList->GetAnimValue().GetConsolidationMatrix();
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return bboxMatrix.PreMultiply(gradientTransform);
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}
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dom::SVGLinearGradientElement*
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nsSVGGradientFrame::GetLinearGradientWithLength(uint32_t aIndex,
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dom::SVGLinearGradientElement* aDefault)
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{
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// If this was a linear gradient with the required length, we would have
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// already found it in nsSVGLinearGradientFrame::GetLinearGradientWithLength.
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// Since we didn't find the length, continue looking down the chain.
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// Before we recurse, make sure we'll break reference loops and over long
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// reference chains:
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static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
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AutoReferenceChainGuard refChainGuard(this, &mLoopFlag,
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&sRefChainLengthCounter);
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if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
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// Break reference chain
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return aDefault;
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}
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nsSVGGradientFrame *next = GetReferencedGradient();
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return next ? next->GetLinearGradientWithLength(aIndex, aDefault) : aDefault;
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}
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dom::SVGRadialGradientElement*
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nsSVGGradientFrame::GetRadialGradientWithLength(uint32_t aIndex,
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dom::SVGRadialGradientElement* aDefault)
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{
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// If this was a radial gradient with the required length, we would have
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// already found it in nsSVGRadialGradientFrame::GetRadialGradientWithLength.
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// Since we didn't find the length, continue looking down the chain.
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// Before we recurse, make sure we'll break reference loops and over long
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// reference chains:
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static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
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AutoReferenceChainGuard refChainGuard(this, &mLoopFlag,
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&sRefChainLengthCounter);
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if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
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// Break reference chain
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return aDefault;
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}
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nsSVGGradientFrame *next = GetReferencedGradient();
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return next ? next->GetRadialGradientWithLength(aIndex, aDefault) : aDefault;
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}
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//----------------------------------------------------------------------
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// nsSVGPaintServerFrame methods:
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//helper
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static void GetStopInformation(nsIFrame* aStopFrame,
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float *aOffset,
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nscolor *aStopColor,
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float *aStopOpacity)
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{
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nsIContent* stopContent = aStopFrame->GetContent();
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MOZ_ASSERT(stopContent && stopContent->IsSVGElement(nsGkAtoms::stop));
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static_cast<SVGStopElement*>(stopContent)->
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GetAnimatedNumberValues(aOffset, nullptr);
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*aOffset = mozilla::clamped(*aOffset, 0.0f, 1.0f);
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*aStopColor = aStopFrame->StyleSVGReset()->mStopColor;
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*aStopOpacity = aStopFrame->StyleSVGReset()->mStopOpacity;
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}
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mozilla::Pair<DrawResult, RefPtr<gfxPattern>>
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nsSVGGradientFrame::GetPaintServerPattern(nsIFrame* aSource,
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const DrawTarget* aDrawTarget,
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const gfxMatrix& aContextMatrix,
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nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
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float aGraphicOpacity,
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const gfxRect* aOverrideBounds,
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uint32_t aFlags)
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{
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uint16_t gradientUnits = GetGradientUnits();
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MOZ_ASSERT(gradientUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX ||
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gradientUnits == SVG_UNIT_TYPE_USERSPACEONUSE);
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if (gradientUnits == SVG_UNIT_TYPE_USERSPACEONUSE) {
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// Set mSource for this consumer.
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// If this gradient is applied to text, our caller will be the glyph, which
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// is not an element, so we need to get the parent
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mSource = aSource->GetContent()->IsNodeOfType(nsINode::eTEXT) ?
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aSource->GetParent() : aSource;
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}
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AutoTArray<nsIFrame*,8> stopFrames;
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GetStopFrames(&stopFrames);
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uint32_t nStops = stopFrames.Length();
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// SVG specification says that no stops should be treated like
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// the corresponding fill or stroke had "none" specified.
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if (nStops == 0) {
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RefPtr<gfxPattern> pattern = new gfxPattern(Color());
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return MakePair(DrawResult::SUCCESS, Move(pattern));
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}
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if (nStops == 1 || GradientVectorLengthIsZero()) {
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// The gradient paints a single colour, using the stop-color of the last
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// gradient step if there are more than one.
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float stopOpacity = stopFrames[nStops-1]->StyleSVGReset()->mStopOpacity;
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nscolor stopColor = stopFrames[nStops-1]->StyleSVGReset()->mStopColor;
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Color stopColor2 = Color::FromABGR(stopColor);
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stopColor2.a *= stopOpacity * aGraphicOpacity;
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RefPtr<gfxPattern> pattern = new gfxPattern(stopColor2);
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return MakePair(DrawResult::SUCCESS, Move(pattern));
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}
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// Get the transform list (if there is one). We do this after the returns
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// above since this call can be expensive when "gradientUnits" is set to
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// "objectBoundingBox" (since that requiring a GetBBox() call).
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gfxMatrix patternMatrix = GetGradientTransform(aSource, aOverrideBounds);
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if (patternMatrix.IsSingular()) {
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return MakePair(DrawResult::SUCCESS, RefPtr<gfxPattern>());
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}
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// revert any vector effect transform so that the gradient appears unchanged
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if (aFillOrStroke == &nsStyleSVG::mStroke) {
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gfxMatrix userToOuterSVG;
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if (nsSVGUtils::GetNonScalingStrokeTransform(aSource, &userToOuterSVG)) {
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patternMatrix *= userToOuterSVG;
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}
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}
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if (!patternMatrix.Invert()) {
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return MakePair(DrawResult::SUCCESS, RefPtr<gfxPattern>());
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}
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RefPtr<gfxPattern> gradient = CreateGradient();
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if (!gradient) {
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return MakePair(DrawResult::TEMPORARY_ERROR, RefPtr<gfxPattern>());
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}
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uint16_t aSpread = GetSpreadMethod();
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if (aSpread == SVG_SPREADMETHOD_PAD)
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gradient->SetExtend(ExtendMode::CLAMP);
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else if (aSpread == SVG_SPREADMETHOD_REFLECT)
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gradient->SetExtend(ExtendMode::REFLECT);
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else if (aSpread == SVG_SPREADMETHOD_REPEAT)
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gradient->SetExtend(ExtendMode::REPEAT);
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gradient->SetMatrix(patternMatrix);
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// setup stops
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float lastOffset = 0.0f;
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for (uint32_t i = 0; i < nStops; i++) {
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float offset, stopOpacity;
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nscolor stopColor;
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GetStopInformation(stopFrames[i], &offset, &stopColor, &stopOpacity);
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if (offset < lastOffset)
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offset = lastOffset;
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else
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lastOffset = offset;
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Color stopColor2 = Color::FromABGR(stopColor);
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stopColor2.a *= stopOpacity * aGraphicOpacity;
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gradient->AddColorStop(offset, stopColor2);
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}
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return MakePair(DrawResult::SUCCESS, Move(gradient));
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}
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// Private (helper) methods
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nsSVGGradientFrame *
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nsSVGGradientFrame::GetReferencedGradient()
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{
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if (mNoHRefURI)
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return nullptr;
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nsSVGPaintingProperty *property =
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Properties().Get(nsSVGEffects::HrefAsPaintingProperty());
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if (!property) {
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// Fetch our gradient element's href or xlink:href attribute
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dom::SVGGradientElement* grad =
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static_cast<dom::SVGGradientElement*>(mContent);
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nsAutoString href;
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if (grad->mStringAttributes[dom::SVGGradientElement::HREF]
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.IsExplicitlySet()) {
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grad->mStringAttributes[dom::SVGGradientElement::HREF]
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.GetAnimValue(href, grad);
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} else {
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grad->mStringAttributes[dom::SVGGradientElement::XLINK_HREF]
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.GetAnimValue(href, grad);
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}
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if (href.IsEmpty()) {
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mNoHRefURI = true;
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return nullptr; // no URL
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}
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// Convert href to an nsIURI
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nsCOMPtr<nsIURI> targetURI;
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nsCOMPtr<nsIURI> base = mContent->GetBaseURI();
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nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
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mContent->GetUncomposedDoc(), base);
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property =
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nsSVGEffects::GetPaintingProperty(targetURI, this,
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nsSVGEffects::HrefAsPaintingProperty());
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if (!property)
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return nullptr;
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}
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nsIFrame *result = property->GetReferencedFrame();
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if (!result)
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return nullptr;
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LayoutFrameType frameType = result->Type();
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if (frameType != LayoutFrameType::SVGLinearGradient &&
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frameType != LayoutFrameType::SVGRadialGradient)
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return nullptr;
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return static_cast<nsSVGGradientFrame*>(result);
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}
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void
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nsSVGGradientFrame::GetStopFrames(nsTArray<nsIFrame*>* aStopFrames)
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{
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nsIFrame *stopFrame = nullptr;
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for (stopFrame = mFrames.FirstChild(); stopFrame;
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stopFrame = stopFrame->GetNextSibling()) {
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if (stopFrame->IsSVGStopFrame()) {
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aStopFrames->AppendElement(stopFrame);
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}
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}
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if (aStopFrames->Length() > 0) {
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return;
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}
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// Our gradient element doesn't have stops - try to "inherit" them
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// Before we recurse, make sure we'll break reference loops and over long
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// reference chains:
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static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
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AutoReferenceChainGuard refChainGuard(this, &mLoopFlag,
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&sRefChainLengthCounter);
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if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
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// Break reference chain
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return;
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}
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nsSVGGradientFrame* next = GetReferencedGradient();
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if (next) {
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next->GetStopFrames(aStopFrames);
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}
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}
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// -------------------------------------------------------------------------
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// Linear Gradients
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// -------------------------------------------------------------------------
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#ifdef DEBUG
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void
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nsSVGLinearGradientFrame::Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::linearGradient),
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"Content is not an SVG linearGradient");
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nsSVGGradientFrame::Init(aContent, aParent, aPrevInFlow);
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}
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#endif /* DEBUG */
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nsresult
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nsSVGLinearGradientFrame::AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType)
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{
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if (aNameSpaceID == kNameSpaceID_None &&
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(aAttribute == nsGkAtoms::x1 ||
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aAttribute == nsGkAtoms::y1 ||
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aAttribute == nsGkAtoms::x2 ||
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aAttribute == nsGkAtoms::y2)) {
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nsSVGEffects::InvalidateDirectRenderingObservers(this);
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}
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return nsSVGGradientFrame::AttributeChanged(aNameSpaceID,
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aAttribute, aModType);
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}
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//----------------------------------------------------------------------
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float
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nsSVGLinearGradientFrame::GetLengthValue(uint32_t aIndex)
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{
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dom::SVGLinearGradientElement* lengthElement =
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GetLinearGradientWithLength(aIndex,
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static_cast<dom::SVGLinearGradientElement*>(mContent));
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// We passed in mContent as a fallback, so, assuming mContent is non-null, the
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// return value should also be non-null.
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MOZ_ASSERT(lengthElement,
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"Got unexpected null element from GetLinearGradientWithLength");
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const nsSVGLength2 &length = lengthElement->mLengthAttributes[aIndex];
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// Object bounding box units are handled by setting the appropriate
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// transform in GetGradientTransform, but we need to handle user
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// space units as part of the individual Get* routines. Fixes 323669.
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uint16_t gradientUnits = GetGradientUnits();
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if (gradientUnits == SVG_UNIT_TYPE_USERSPACEONUSE) {
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return nsSVGUtils::UserSpace(mSource, &length);
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}
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NS_ASSERTION(
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gradientUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX,
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"Unknown gradientUnits type");
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return length.GetAnimValue(static_cast<SVGSVGElement*>(nullptr));
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}
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dom::SVGLinearGradientElement*
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nsSVGLinearGradientFrame::GetLinearGradientWithLength(uint32_t aIndex,
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dom::SVGLinearGradientElement* aDefault)
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{
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dom::SVGLinearGradientElement* thisElement =
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static_cast<dom::SVGLinearGradientElement*>(mContent);
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const nsSVGLength2 &length = thisElement->mLengthAttributes[aIndex];
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if (length.IsExplicitlySet()) {
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return thisElement;
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}
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return nsSVGGradientFrame::GetLinearGradientWithLength(aIndex, aDefault);
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}
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bool
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nsSVGLinearGradientFrame::GradientVectorLengthIsZero()
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{
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return GetLengthValue(dom::SVGLinearGradientElement::ATTR_X1) ==
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GetLengthValue(dom::SVGLinearGradientElement::ATTR_X2) &&
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GetLengthValue(dom::SVGLinearGradientElement::ATTR_Y1) ==
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GetLengthValue(dom::SVGLinearGradientElement::ATTR_Y2);
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}
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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 */
|
|
|
|
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)
|