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Bug 1250490 - Part 1. Move DetermineMaskUsage and ComputeOpacity to nsSVGUtils. r=mstange

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MozReview-Commit-ID: K06trG9nuvU

--HG--
extra : rebase_source : ad7651daa0752ba6c128853de19e758694705793
This commit is contained in:
cku 2016-11-03 11:08:06 +08:00
parent f89ebba64a
commit 511431abbf
2 changed files with 98 additions and 1 deletions
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80
layout/svg/nsSVGUtils.cpp
View File

@ -486,6 +486,84 @@ public:
}
};
float
nsSVGUtils::ComputeOpacity(nsIFrame* aFrame, bool aHandleOpacity)
{
float opacity = aFrame->StyleEffects()->mOpacity;
if (opacity != 1.0f &&
(nsSVGUtils::CanOptimizeOpacity(aFrame) || !aHandleOpacity)) {
return 1.0f;
}
return opacity;
}
void
nsSVGUtils::DetermineMaskUsage(nsIFrame* aFrame, bool aHandleOpacity,
MaskUsage& aUsage)
{
aUsage.opacity = ComputeOpacity(aFrame, aHandleOpacity);
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
nsSVGEffects::EffectProperties effectProperties =
nsSVGEffects::GetEffectProperties(firstFrame);
const nsStyleSVGReset *svgReset = firstFrame->StyleSVGReset();
nsTArray<nsSVGMaskFrame*> maskFrames = effectProperties.GetMaskFrames();
#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
// For a HTML doc:
// According to css-masking spec, always create a mask surface when we
// have any item in maskFrame even if all of those items are
// non-resolvable <mask-sources> or <images>, we still need to create a
// transparent black mask layer under this condition.
// For a SVG doc:
// SVG 1.1 say that if we fail to resolve a mask, we should draw the
// object unmasked.
aUsage.shouldGenerateMaskLayer =
(aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)
? maskFrames.Length() == 1 && maskFrames[0]
: maskFrames.Length() > 0;
#else
// Since we do not support image mask so far, we should treat any
// unresolvable mask as no mask. Otherwise, any object with a valid image
// mask, e.g. url("xxx.png"), will become invisible just because we can not
// handle image mask correctly. (See bug 1294171)
aUsage.shouldGenerateMaskLayer = maskFrames.Length() == 1 && maskFrames[0];
#endif
bool isOK = effectProperties.HasNoFilterOrHasValidFilter();
nsSVGClipPathFrame *clipPathFrame = effectProperties.GetClipPathFrame(&isOK);
MOZ_ASSERT_IF(clipPathFrame,
svgReset->mClipPath.GetType() == StyleShapeSourceType::URL);
switch (svgReset->mClipPath.GetType()) {
case StyleShapeSourceType::URL:
if (clipPathFrame) {
if (clipPathFrame->IsTrivial()) {
aUsage.shouldApplyClipPath = true;
} else {
aUsage.shouldGenerateClipMaskLayer = true;
}
}
break;
case StyleShapeSourceType::Shape:
case StyleShapeSourceType::Box:
aUsage.shouldApplyBasicShape = true;
break;
case StyleShapeSourceType::None:
MOZ_ASSERT(!aUsage.shouldGenerateClipMaskLayer &&
!aUsage.shouldApplyClipPath && !aUsage.shouldApplyBasicShape);
break;
default:
MOZ_ASSERT_UNREACHABLE("Unsupported clip-path type.");
break;
}
}
DrawResult
nsSVGUtils::PaintFrameWithEffects(nsIFrame *aFrame,
gfxContext& aContext,
@ -566,7 +644,7 @@ nsSVGUtils::PaintFrameWithEffects(nsIFrame *aFrame,
*
* + Use cairo's clipPath when representable natively (single object
* clip region).
*
*f
* + Merge opacity and masking if both used together.
*/

19
layout/svg/nsSVGUtils.h
View File

@ -576,6 +576,25 @@ public:
ToCanvasBounds(const gfxRect &aUserspaceRect,
const gfxMatrix &aToCanvas,
const nsPresContext *presContext);
struct MaskUsage {
bool shouldGenerateMaskLayer;
bool shouldGenerateClipMaskLayer;
bool shouldApplyClipPath;
bool shouldApplyBasicShape;
float opacity;
MaskUsage()
: shouldGenerateMaskLayer(false), shouldGenerateClipMaskLayer(false),
shouldApplyClipPath(false), shouldApplyBasicShape(false), opacity(0.0)
{ }
};
static void
DetermineMaskUsage(nsIFrame* aFrame, bool aHandleOpacity, MaskUsage& aUsage);
static float
ComputeOpacity(nsIFrame* aFrame, bool aHandleOpacity);
};
#endif