GrXferProcessor::OptFlags PorterDuffXferProcessor::onGetOptimizations(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI, bool doesStencilWrite, GrColor* overrideColor, const GrCaps& caps) { GrXferProcessor::OptFlags optFlags = GrXferProcessor::kNone_OptFlags; if (!fBlendFormula.modifiesDst()) { if (!doesStencilWrite) { optFlags |= GrXferProcessor::kSkipDraw_OptFlag; } optFlags |= (GrXferProcessor::kIgnoreColor_OptFlag | GrXferProcessor::kIgnoreCoverage_OptFlag | GrXferProcessor::kCanTweakAlphaForCoverage_OptFlag); } else { if (!fBlendFormula.usesInputColor()) { optFlags |= GrXferProcessor::kIgnoreColor_OptFlag; } if (coveragePOI.isSolidWhite()) { optFlags |= GrXferProcessor::kIgnoreCoverage_OptFlag; } if (colorPOI.allStagesMultiplyInput() && fBlendFormula.canTweakAlphaForCoverage()) { optFlags |= GrXferProcessor::kCanTweakAlphaForCoverage_OptFlag; } } return optFlags; }