commit ffdc3e668061cff14ea55ba087e9105f2ff219fc
author Ethan Nicholas <ethannicholas@google.com> Thu Sep 19 16:58:33 2019 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Fri Sep 20 13:41:10 2019 +0000
tree 9a7798ae94c23e06ffffb60054360fcdbeb0292a
parent 9a98411780788d33bb954e32bb5d1271b3c2571e

added support for SkSL unpremul function

Change-Id: I970f1ad0dd0859448c874498fe02342f8abc3aa3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/242897
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

src/gpu/glsl/GrGLSLShaderBuilder.cpp

diff --git a/src/gpu/glsl/GrGLSLShaderBuilder.cpp b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
index a87d591..a75479d 100644
--- a/src/gpu/glsl/GrGLSLShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
@@ -159,8 +159,7 @@
         const GrShaderVar gColorXformArgs[] = { GrShaderVar("color", kHalf4_GrSLType) };
         SkString body;
         if (colorXformHelper->applyUnpremul()) {
-            body.append("half nonZeroAlpha = max(color.a, 0.0001);");
-            body.append("color = half4(color.rgb / nonZeroAlpha, nonZeroAlpha);");
+            body.append("color = unpremul(color);");
         }
         if (colorXformHelper->applySrcTF()) {
             body.appendf("color.r = %s(color.r);", srcTFFuncName.c_str());