diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/gpu/GrBlend.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/gpu/GrBlend.h b/include/gpu/GrBlend.h index 5100bb0539..97a516650e 100644 --- a/include/gpu/GrBlend.h +++ b/include/gpu/GrBlend.h @@ -212,6 +212,9 @@ struct GrTBlendModifiesDst : skstd::bool_constant< * * By inspection we can see this will work as long as dstCoeff has a 1, and any other term in * dstCoeff references S. + * + * Moreover, if the blend doesn't modify the dst at all then it is ok to arbitrarily modify the src + * color so folding in coverage is allowed. */ template<GrBlendEquation Equation, GrBlendCoeff SrcCoeff, GrBlendCoeff DstCoeff> struct GrTBlendCanTweakAlphaForCoverage : skstd::bool_constant< @@ -220,7 +223,8 @@ struct GrTBlendCanTweakAlphaForCoverage : skstd::bool_constant< !GR_BLEND_COEFF_REFS_SRC(SrcCoeff) && (kOne_GrBlendCoeff == DstCoeff || kISC_GrBlendCoeff == DstCoeff || - kISA_GrBlendCoeff == DstCoeff))> {}; + kISA_GrBlendCoeff == DstCoeff)) || + !GrTBlendModifiesDst<Equation, SrcCoeff, DstCoeff>::value> {}; #define GR_BLEND_CAN_TWEAK_ALPHA_FOR_COVERAGE(EQUATION, SRC_COEFF, DST_COEFF) \ GrTBlendCanTweakAlphaForCoverage<EQUATION, SRC_COEFF, DST_COEFF>::value |