Fix color gamut xform matrices in GPU code

Now that we're not storing them transposed, we can plumb them to the
shader column-major all the way, and then multiply colors on the right, as
it should be.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2326093002

Review-Url: https://codereview.chromium.org/2326093002

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gpu/glsl/GrGLSLShaderBuilder.cpp b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
index 8b004b265f..26a7761f32 100644
--- a/src/gpu/glsl/GrGLSLShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
@@ -149,7 +149,7 @@ void GrGLSLShaderBuilder::appendColorGamutXform(SkString* out,
                             "\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");