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Fix srcAlpaWillBeOne() for coverage drawing

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R=egdaniel@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/480113002
This commit is contained in:
bsalomon 2014-08-18 11:49:37 -07:00 committed by Commit bot
parent 62b67ae96e
commit 637e57e3be
1 changed files with 21 additions and 11 deletions
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32
src/gpu/GrDrawState.cpp
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@ -396,22 +396,32 @@ bool GrDrawState::srcAlphaWillBeOne() const {
// Check whether coverage is treated as color. If so we run through the coverage computation.
if (this->isCoverageDrawing()) {
GrColor coverageColor = this->getCoverageColor();
GrColor oldColor = color;
color = 0;
for (int c = 0; c < 4; ++c) {
if (validComponentFlags & (1 << c)) {
U8CPU a = (oldColor >> (c * 8)) & 0xff;
U8CPU b = (coverageColor >> (c * 8)) & 0xff;
color |= (SkMulDiv255Round(a, b) << (c * 8));
}
// The shader generated for coverage drawing runs the full coverage computation and then
// makes the shader output be the multiplication of color and coverage. We mirror that here.
GrColor coverage;
uint32_t coverageComponentFlags;
if (this->hasCoverageVertexAttribute()) {
coverageComponentFlags = 0;
coverage = 0; // suppresses any warnings.
} else {
coverageComponentFlags = kRGBA_GrColorComponentFlags;
coverage = this->getCoverageColor();
}
// Run through the coverage stages
for (int s = 0; s < this->numCoverageStages(); ++s) {
const GrEffect* effect = this->getCoverageStage(s).getEffect();
effect->getConstantColorComponents(&color, &validComponentFlags);
effect->getConstantColorComponents(&coverage, &coverageComponentFlags);
}
// Since the shader will multiply coverage and color, the only way the final A==1 is if
// coverage and color both have A==1.
return (kA_GrColorComponentFlag & validComponentFlags & coverageComponentFlags) &&
0xFF == GrColorUnpackA(color) && 0xFF == GrColorUnpackA(coverage);
}
return (kA_GrColorComponentFlag & validComponentFlags) && 0xff == GrColorUnpackA(color);
return (kA_GrColorComponentFlag & validComponentFlags) && 0xFF == GrColorUnpackA(color);
}
bool GrDrawState::hasSolidCoverage() const {