680 lines
22 KiB
C++
680 lines
22 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 "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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// Helper classes
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class MOZ_RAII nsSVGGradientFrame::AutoGradientReferencer
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{
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public:
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explicit AutoGradientReferencer(nsSVGGradientFrame *aFrame
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MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mFrame(aFrame)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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// Reference loops should normally be detected in advance and handled, so
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// we're not expecting to encounter them here
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MOZ_ASSERT(!mFrame->mLoopFlag, "Undetected reference loop!");
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mFrame->mLoopFlag = true;
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}
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~AutoGradientReferencer() {
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mFrame->mLoopFlag = false;
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}
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private:
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nsSVGGradientFrame *mFrame;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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//----------------------------------------------------------------------
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// Implementation
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nsSVGGradientFrame::nsSVGGradientFrame(nsStyleContext* aContext)
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: nsSVGPaintServerFrame(aContext)
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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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DeleteProperty(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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AutoGradientReferencer gradientRef(this);
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nsSVGGradientFrame *next = GetReferencedGradientIfNotInUse();
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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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AutoGradientReferencer gradientRef(this);
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nsSVGGradientFrame *next = GetReferencedGradientIfNotInUse();
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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 ? *aOverrideBounds : nsSVGUtils::GetBBox(aSource);
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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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AutoGradientReferencer gradientRef(this);
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nsSVGGradientFrame *next = GetReferencedGradientIfNotInUse();
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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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AutoGradientReferencer gradientRef(this);
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nsSVGGradientFrame *next = GetReferencedGradientIfNotInUse();
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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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already_AddRefed<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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{
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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 pattern.forget();
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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 pattern.forget();
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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 nullptr;
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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 nullptr;
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}
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RefPtr<gfxPattern> gradient = CreateGradient();
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if (!gradient || gradient->CairoStatus())
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return nullptr;
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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 gradient.forget();
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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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GetProperty(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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nsIAtom* frameType = result->GetType();
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if (frameType != nsGkAtoms::svgLinearGradientFrame &&
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frameType != nsGkAtoms::svgRadialGradientFrame)
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return nullptr;
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return static_cast<nsSVGGradientFrame*>(result);
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}
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nsSVGGradientFrame *
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nsSVGGradientFrame::GetReferencedGradientIfNotInUse()
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{
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nsSVGGradientFrame *referenced = GetReferencedGradient();
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if (!referenced)
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return nullptr;
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if (referenced->mLoopFlag) {
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// XXXjwatt: we should really send an error to the JavaScript Console here:
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NS_WARNING("gradient reference loop detected while inheriting attribute!");
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return nullptr;
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}
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return referenced;
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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->GetType() == nsGkAtoms::svgStopFrame) {
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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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AutoGradientReferencer gradientRef(this);
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nsSVGGradientFrame* next = GetReferencedGradientIfNotInUse();
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if (!next) {
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return;
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}
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return next->GetStopFrames(aStopFrames);
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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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nsIAtom*
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nsSVGLinearGradientFrame::GetType() const
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{
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return nsGkAtoms::svgLinearGradientFrame;
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}
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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>
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nsSVGLinearGradientFrame::CreateGradient()
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{
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float x1, y1, x2, y2;
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x1 = GetLengthValue(dom::SVGLinearGradientElement::ATTR_X1);
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y1 = GetLengthValue(dom::SVGLinearGradientElement::ATTR_Y1);
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x2 = GetLengthValue(dom::SVGLinearGradientElement::ATTR_X2);
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y2 = GetLengthValue(dom::SVGLinearGradientElement::ATTR_Y2);
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RefPtr<gfxPattern> pattern = new gfxPattern(x1, y1, x2, y2);
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return pattern.forget();
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}
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// -------------------------------------------------------------------------
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// Radial Gradients
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// -------------------------------------------------------------------------
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#ifdef DEBUG
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void
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nsSVGRadialGradientFrame::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::radialGradient),
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"Content is not an SVG radialGradient");
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nsSVGGradientFrame::Init(aContent, aParent, aPrevInFlow);
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}
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#endif /* DEBUG */
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nsIAtom*
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nsSVGRadialGradientFrame::GetType() const
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{
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return nsGkAtoms::svgRadialGradientFrame;
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}
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nsresult
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nsSVGRadialGradientFrame::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::r ||
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aAttribute == nsGkAtoms::cx ||
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aAttribute == nsGkAtoms::cy ||
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aAttribute == nsGkAtoms::fx ||
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aAttribute == nsGkAtoms::fy)) {
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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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nsSVGRadialGradientFrame::GetLengthValue(uint32_t aIndex)
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{
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dom::SVGRadialGradientElement* lengthElement =
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GetRadialGradientWithLength(aIndex,
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static_cast<dom::SVGRadialGradientElement*>(mContent));
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// We passed in mContent as a fallback, so, assuming mContent is non-null,
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// the return value should also be non-null.
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MOZ_ASSERT(lengthElement,
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"Got unexpected null element from GetRadialGradientWithLength");
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return GetLengthValueFromElement(aIndex, *lengthElement);
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}
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float
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nsSVGRadialGradientFrame::GetLengthValue(uint32_t aIndex, float aDefaultValue)
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{
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dom::SVGRadialGradientElement* lengthElement =
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GetRadialGradientWithLength(aIndex, nullptr);
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return lengthElement ? GetLengthValueFromElement(aIndex, *lengthElement)
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: aDefaultValue;
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}
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float
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nsSVGRadialGradientFrame::GetLengthValueFromElement(uint32_t aIndex,
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dom::SVGRadialGradientElement& aElement)
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{
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const nsSVGLength2 &length = aElement.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::SVGRadialGradientElement*
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nsSVGRadialGradientFrame::GetRadialGradientWithLength(uint32_t aIndex,
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dom::SVGRadialGradientElement* aDefault)
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{
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dom::SVGRadialGradientElement* thisElement =
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static_cast<dom::SVGRadialGradientElement*>(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::GetRadialGradientWithLength(aIndex, aDefault);
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}
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bool
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nsSVGRadialGradientFrame::GradientVectorLengthIsZero()
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{
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return GetLengthValue(dom::SVGRadialGradientElement::ATTR_R) == 0;
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}
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already_AddRefed<gfxPattern>
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nsSVGRadialGradientFrame::CreateGradient()
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{
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float cx, cy, r, fx, fy, fr;
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cx = GetLengthValue(dom::SVGRadialGradientElement::ATTR_CX);
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cy = GetLengthValue(dom::SVGRadialGradientElement::ATTR_CY);
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r = GetLengthValue(dom::SVGRadialGradientElement::ATTR_R);
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// If fx or fy are not set, use cx/cy instead
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fx = GetLengthValue(dom::SVGRadialGradientElement::ATTR_FX, cx);
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fy = GetLengthValue(dom::SVGRadialGradientElement::ATTR_FY, cy);
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fr = GetLengthValue(dom::SVGRadialGradientElement::ATTR_FR);
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if (fx != cx || fy != cy) {
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// The focal point (fFx and fFy) must be clamped to be *inside* - not on -
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// the circumference of the gradient or we'll get rendering anomalies. We
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// calculate the distance from the focal point to the gradient center and
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// make sure it is *less* than the gradient radius.
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// 1/128 is the limit of the fractional part of cairo's 24.8 fixed point
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// representation divided by 2 to ensure that we get different cairo
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// fractions
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double dMax = std::max(0.0, r - 1.0/128);
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float dx = fx - cx;
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float dy = fy - cy;
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double d = sqrt((dx * dx) + (dy * dy));
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if (d > dMax) {
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double angle = atan2(dy, dx);
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fx = (float)(dMax * cos(angle)) + cx;
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fy = (float)(dMax * sin(angle)) + cy;
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}
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}
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RefPtr<gfxPattern> pattern = new gfxPattern(fx, fy, fr, cx, cy, r);
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return pattern.forget();
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}
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// -------------------------------------------------------------------------
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// Public functions
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// -------------------------------------------------------------------------
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nsIFrame*
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NS_NewSVGLinearGradientFrame(nsIPresShell* aPresShell,
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nsStyleContext* aContext)
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{
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return new (aPresShell) nsSVGLinearGradientFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsSVGLinearGradientFrame)
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nsIFrame*
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NS_NewSVGRadialGradientFrame(nsIPresShell* aPresShell,
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nsStyleContext* aContext)
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{
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return new (aPresShell) nsSVGRadialGradientFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsSVGRadialGradientFrame)
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