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[SVGDom] Don't truncate opacity scalars

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Round instead, for more accurate values.

R=robertphillips@google.com,stephana@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2284123003

Review-Url: https://codereview.chromium.org/2284123003
This commit is contained in:
fmalita 2016-08-29 05:54:42 -07:00 committed by Commit bot
parent 839d3ad854
commit a26cab0c53
1 changed files with 7 additions and 3 deletions
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10
experimental/svg/model/SkSVGRenderContext.cpp
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@ -113,6 +113,10 @@ void applySvgPaint(const SkSVGPaint& svgPaint, SkPaint* p) {
}
}
inline uint8_t opacity_to_alpha(SkScalar o) {
return SkTo<uint8_t>(SkScalarRoundToInt(o * 255));
}
// Commit the selected attribute to the paint cache.
template <SkSVGAttribute>
void commitToPaint(const SkSVGPresentationAttributes&,
@ -137,7 +141,7 @@ template <>
void commitToPaint<SkSVGAttribute::kFillOpacity>(const SkSVGPresentationAttributes& attrs,
const SkSVGLengthContext&,
SkSVGPresentationContext* pctx) {
pctx->fFillPaint.setAlpha(static_cast<uint8_t>(*attrs.fFillOpacity.get() * 255));
pctx->fFillPaint.setAlpha(opacity_to_alpha(*attrs.fFillOpacity.get()));
}
template <>
@ -164,7 +168,7 @@ template <>
void commitToPaint<SkSVGAttribute::kStrokeOpacity>(const SkSVGPresentationAttributes& attrs,
const SkSVGLengthContext&,
SkSVGPresentationContext* pctx) {
pctx->fStrokePaint.setAlpha(static_cast<uint8_t>(*attrs.fStrokeOpacity.get() * 255));
pctx->fStrokePaint.setAlpha(opacity_to_alpha(*attrs.fStrokeOpacity.get()));
}
template <>
@ -246,7 +250,7 @@ void SkSVGRenderContext::applyPresentationAttributes(const SkSVGPresentationAttr
if (auto* opacity = attrs.fOpacity.getMaybeNull()) {
SkPaint opacityPaint;
opacityPaint.setAlpha(static_cast<uint8_t>(opacity->value() * 255));
opacityPaint.setAlpha(opacity_to_alpha(opacity->value()));
// Balanced in the destructor, via restoreToCount().
fCanvas->saveLayer(nullptr, &opacityPaint);
}