void GrOptDrawState::copyEffectiveColorStages(const GrDrawState& ds) {
int firstColorStage = 0;
// Set up color and flags for ConstantColorComponent checks
GrColor color;
uint32_t validComponentFlags;
if (!this->hasColorVertexAttribute()) {
color = ds.getColor();
validComponentFlags = kRGBA_GrColorComponentFlags;
} else {
if (ds.vertexColorsAreOpaque()) {
color = 0xFF << GrColor_SHIFT_A;
validComponentFlags = kA_GrColorComponentFlag;
} else {
validComponentFlags = 0;
color = 0; // not strictly necessary but we get false alarms from tools about uninit.
}
}
for (int i = 0; i < ds.numColorStages(); ++i) {
const GrFragmentProcessor* fp = ds.getColorStage(i).getFragmentProcessor();
if (!fp->willUseInputColor()) {
firstColorStage = i;
fInputColorIsUsed = false;
}
fp->getConstantColorComponents(&color, &validComponentFlags);
if (kRGBA_GrColorComponentFlags == validComponentFlags) {
firstColorStage = i + 1;
fColor = color;
fInputColorIsUsed = true;
this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding);
}
}
if (firstColorStage < ds.numColorStages()) {
fColorStages.reset(&ds.getColorStage(firstColorStage),
ds.numColorStages() - firstColorStage);
} else {
fColorStages.reset();
}
}
