Fix color gamut xform matrices in GPU code

src/gpu/glsl/GrGLSLShaderBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrSwizzle.h"
 #include "glsl/GrGLSLShaderBuilder.h"
 #include "glsl/GrGLSLCaps.h"
@@ skipping 131 matching lines @@
         GrGLSLShaderVar("color", kVec4f_GrSLType),
         GrGLSLShaderVar("xform", kMat44f_GrSLType),
     };
     SkString functionBody;
     if (kPremul_SkAlphaType == colorXformHelper->alphaType()) {
         // Unpremultiply
         functionBody.append("\tfloat nonZeroAlpha = max(color.a, 0.00001);\n"
                             "\tcolor.rgb = color.rgb / nonZeroAlpha;\n");
     }
     // Gamut xform, clamp to destination gamut
-    functionBody.append("\tcolor.rgb = clamp((vec4(color.rgb, 1.0) * xform).rgb, 0.0, 1.0);\n");
+    functionBody.append("\tcolor.rgb = clamp((xform * vec4(color.rgb, 1.0)).rgb, 0.0, 1.0);\n");
     if (kPremul_SkAlphaType == colorXformHelper->alphaType()) {
         // Re-multiply by alpha
         functionBody.append("\tcolor.rgb = color.rgb * nonZeroAlpha;\n");
     }
     functionBody.append("\treturn color;");
     SkString colorGamutXformFuncName;
     this->emitFunction(kVec4f_GrSLType,
                        "colorGamutXform",
                        SK_ARRAY_COUNT(gColorGamutXformArgs),
                        gColorGamutXformArgs,
@@ skipping 90 matching lines @@
     // append the 'footer' to code
     this->code().append("}");
 
     for (int i = 0; i <= fCodeIndex; i++) {
         fCompilerStrings[i] = fShaderStrings[i].c_str();
         fCompilerStringLengths[i] = (int)fShaderStrings[i].size();
     }
 
     fFinalized = true;
 }