commit 669b15a93548b82135c73196665bcb7f03d87795
author Derek Sollenberger <djsollen@google.com> Fri Mar 31 12:09:24 2017 -0400
committer Derek Sollenberger <djsollen@google.com> Tue Apr 04 12:07:28 2017 -0400
tree 7ff6e8179d2ac972db944e94b30f036af659ec52
parent 3f2bbcbe92cd2500746153ed2378278c1b2a53e2

Fix HWUI/Skia Gradients to premultiply the colors prior to interpolation

This is fixed in Skia by passing the appropriate flag when the shader is
generated.  The fix in HWUI is to reverse the premultiplication and
interpolation steps.

Test: bit CtsUiRenderingTestCases:.testclasses.ShaderTests
Bug: 34323783
Change-Id: I3417141949f62fcc696b6d8213a4b446d7d0cbf8

libs/hwui/SkiaShader.cpp

diff --git a/libs/hwui/SkiaShader.cpp b/libs/hwui/SkiaShader.cpp
index 8a504d4..5c5378b 100644
--- a/libs/hwui/SkiaShader.cpp
+++ b/libs/hwui/SkiaShader.cpp
@@ -173,8 +173,8 @@
         outData->gradientSampler = 0;
         outData->gradientTexture = nullptr;
 
-        outData->startColor.setUnPreMultiplied(gradInfo.fColors[0]);
-        outData->endColor.setUnPreMultiplied(gradInfo.fColors[1]);
+        outData->startColor.set(gradInfo.fColors[0]);
+        outData->endColor.set(gradInfo.fColors[1]);
     }
 
     return true;