commit 5f78d2251a440443c9eaa321dad058d7a32bfef7
author egdaniel <egdaniel@google.com> Fri Jul 11 08:57:40 2014 -0700
committer Commit bot <commit-bot@chromium.org> Fri Jul 11 08:57:40 2014 -0700
tree db019baabf35aaac3c6f34d2034a444466dfb468
parent 133931f4abdafa5bb0bdea3a02af1e5a70d5ac98

Remove gpu shader optimatization for solid white or trans black colors

Running test on the added bench which draws a grid of all white paths, all blue paths, or alternating checkered white/blue paths.

With optimization in (ms):
         White       Blue        Checkered
Linux    ~80         ~80         ~160
N7       ~800        ~1100       ~1500
Moto-e   ~830        ~1100       ~2500

Without optimization in (ms):
         White       Blue        Checkered
Linux    ~80         ~80         ~80
N7       ~1100       ~1100       ~1100
Moto-e   ~1100       ~1100       ~1500

BUG=skia:
R=bsalomon@google.com

Author: egdaniel@google.com

Review URL: https://codereview.chromium.org/375823005

src/gpu/gl/GrGLProgramDesc.cpp

diff --git a/src/gpu/gl/GrGLProgramDesc.cpp b/src/gpu/gl/GrGLProgramDesc.cpp
index ecd48e0..cff4a2b 100644
--- a/src/gpu/gl/GrGLProgramDesc.cpp
+++ b/src/gpu/gl/GrGLProgramDesc.cpp
@@ -89,11 +89,6 @@
     bool requiresLocalCoordAttrib = !(skipCoverage  && skipColor) &&
                                     drawState.hasLocalCoordAttribute();
 
-    bool colorIsTransBlack = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
-    bool colorIsSolidWhite = (blendOpts & GrDrawState::kEmitCoverage_BlendOptFlag) ||
-                             (!requiresColorAttrib && 0xffffffff == drawState.getColor()) ||
-                             (!inputColorIsUsed);
-
     int numEffects = (skipColor ? 0 : (drawState.numColorStages() - firstEffectiveColorStage)) +
                      (skipCoverage ? 0 : (drawState.numCoverageStages() - firstEffectiveCoverageStage));
 
@@ -148,11 +143,7 @@
 #endif
     bool defaultToUniformInputs = GR_GL_NO_CONSTANT_ATTRIBUTES || gpu->caps()->pathRenderingSupport();
 
-    if (colorIsTransBlack) {
-        header->fColorInput = kTransBlack_ColorInput;
-    } else if (colorIsSolidWhite) {
-        header->fColorInput = kSolidWhite_ColorInput;
-    } else if (defaultToUniformInputs && !requiresColorAttrib) {
+    if (defaultToUniformInputs && !requiresColorAttrib) {
         header->fColorInput = kUniform_ColorInput;
     } else {
         header->fColorInput = kAttribute_ColorInput;
@@ -161,9 +152,7 @@
 
     bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverageColor();
 
-    if (skipCoverage) {
-        header->fCoverageInput = kTransBlack_ColorInput;
-    } else if (covIsSolidWhite || !inputCoverageIsUsed) {
+    if (covIsSolidWhite || !inputCoverageIsUsed) {
         header->fCoverageInput = kSolidWhite_ColorInput;
     } else if (defaultToUniformInputs && !requiresCoverageAttrib) {
         header->fCoverageInput = kUniform_ColorInput;