Add blend constant color and use it for lcd text common case (no fancy blend or shaded text)
Review URL: http://codereview.appspot.com/4274057/
git-svn-id: http://skia.googlecode.com/svn/trunk@941 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrGpuGL.cpp b/gpu/src/GrGpuGL.cpp
index 94e9bfd..f2a2a8f 100644
--- a/gpu/src/GrGpuGL.cpp
+++ b/gpu/src/GrGpuGL.cpp
@@ -45,8 +45,50 @@
GL_ONE_MINUS_SRC_ALPHA,
GL_DST_ALPHA,
GL_ONE_MINUS_DST_ALPHA,
+ GL_CONSTANT_COLOR,
+ GL_ONE_MINUS_CONSTANT_COLOR,
+ GL_CONSTANT_ALPHA,
+ GL_ONE_MINUS_CONSTANT_ALPHA,
};
+bool GrGpuGL::BlendCoefReferencesConstant(GrBlendCoeff coeff) {
+ static const bool gCoeffReferencesBlendConst[] = {
+ false,
+ false,
+ false,
+ false,
+ false,
+ false,
+ false,
+ false,
+ false,
+ false,
+ true,
+ true,
+ true,
+ true,
+ };
+ return gCoeffReferencesBlendConst[coeff];
+ GR_STATIC_ASSERT(kBlendCoeffCount == GR_ARRAY_COUNT(gCoeffReferencesBlendConst));
+}
+
+GR_STATIC_ASSERT(0 == kZero_BlendCoeff);
+GR_STATIC_ASSERT(1 == kOne_BlendCoeff);
+GR_STATIC_ASSERT(2 == kSC_BlendCoeff);
+GR_STATIC_ASSERT(3 == kISC_BlendCoeff);
+GR_STATIC_ASSERT(4 == kDC_BlendCoeff);
+GR_STATIC_ASSERT(5 == kIDC_BlendCoeff);
+GR_STATIC_ASSERT(6 == kSA_BlendCoeff);
+GR_STATIC_ASSERT(7 == kISA_BlendCoeff);
+GR_STATIC_ASSERT(8 == kDA_BlendCoeff);
+GR_STATIC_ASSERT(9 == kIDA_BlendCoeff);
+GR_STATIC_ASSERT(10 == kConstC_BlendCoeff);
+GR_STATIC_ASSERT(11 == kIConstC_BlendCoeff);
+GR_STATIC_ASSERT(12 == kConstA_BlendCoeff);
+GR_STATIC_ASSERT(13 == kIConstA_BlendCoeff);
+
+GR_STATIC_ASSERT(kBlendCoeffCount == GR_ARRAY_COUNT(gXfermodeCoeff2Blend));
+
///////////////////////////////////////////////////////////////////////////////
void GrGpuGL::AdjustTextureMatrix(const GrGLTexture* texture,
@@ -458,6 +500,10 @@
// illegal values
fHWDrawState.fSrcBlend = (GrBlendCoeff)-1;
fHWDrawState.fDstBlend = (GrBlendCoeff)-1;
+
+ fHWDrawState.fBlendConstant = 0x00000000;
+ GR_GL(BlendColor(0,0,0,0));
+
fHWDrawState.fColor = GrColor_ILLEGAL;
fHWDrawState.fViewMatrix = GrMatrix::InvalidMatrix();
@@ -1615,6 +1661,19 @@
fHWDrawState.fSrcBlend = fCurrDrawState.fSrcBlend;
fHWDrawState.fDstBlend = fCurrDrawState.fDstBlend;
}
+ if ((BlendCoefReferencesConstant(fCurrDrawState.fSrcBlend) ||
+ BlendCoefReferencesConstant(fCurrDrawState.fDstBlend)) &&
+ fHWDrawState.fBlendConstant != fCurrDrawState.fBlendConstant) {
+
+ float c[] = {
+ GrColorUnpackR(fCurrDrawState.fBlendConstant) / 255.f,
+ GrColorUnpackG(fCurrDrawState.fBlendConstant) / 255.f,
+ GrColorUnpackB(fCurrDrawState.fBlendConstant) / 255.f,
+ GrColorUnpackA(fCurrDrawState.fBlendConstant) / 255.f
+ };
+ GR_GL(BlendColor(c[0], c[1], c[2], c[3]));
+ fHWDrawState.fBlendConstant = fCurrDrawState.fBlendConstant;
+ }
}
if (fHWDrawState.fDrawFace != fCurrDrawState.fDrawFace) {