Fix to allow ovals GM to finish on N7

src/effects/gradients/SkGradientShader.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGradientShaderPriv.h"
 #include "SkLinearGradient.h"
 #include "SkRadialGradient.h"
@@ skipping 962 matching lines @@
         }
 
         SkString output;
         builder->fsCodeAppendf("\t%s = ", outputColor);
         GrGLSLModulatef<4>(&output, inputColor, "colorTemp");
         builder->fsCodeAppend(output.c_str());
         builder->fsCodeAppend(";\n");
     } else if (GrGradientEffect::kThree_ColorType == ColorTypeFromKey(key)){
         builder->fsCodeAppendf("\tfloat oneMinus2t = 1.0 - (2.0 * (%s));\n",
                                gradientTValue);
-        builder->fsCodeAppendf("\tvec4 colorTemp = clamp(oneMinus2t, 0.0, 1.0) * %s +(1.0 - min(abs(oneMinus2t), 1.0)) * %s + clamp(-oneMinus2t, 0.0, 1.0) * %s;\n",
-                               builder->getUniformVariable(fColorStartUni).c_str(),
-                               builder->getUniformVariable(fColorMidUni).c_str(),
+        builder->fsCodeAppendf("\tvec4 colorTemp = clamp(oneMinus2t, 0.0, 1.0) * %s;\n",
+                               builder->getUniformVariable(fColorStartUni).c_str());
+        if (kTegra3_GrGLRenderer == builder->ctxInfo().renderer()) {
+            // The Tegra3 compiler will sometimes never return if we have
+            // min(abs(oneMinus2t), 1.0), or do the abs first in a separate expression.
+            builder->fsCodeAppend("\tfloat minAbs = abs(oneMinus2t);\n");
+            builder->fsCodeAppend("\tminAbs = minAbs > 1.0 ? 1.0 : minAbs;\n");
+            builder->fsCodeAppendf("\tcolorTemp += (1.0 - minAbs) * %s;\n",
+                                   builder->getUniformVariable(fColorMidUni).c_str());
+        } else {
+            builder->fsCodeAppendf("\tcolorTemp += (1.0 - min(abs(oneMinus2t), 1.0)) * %s;\n",
+                                   builder->getUniformVariable(fColorMidUni).c_str());
+        }
+        builder->fsCodeAppendf("\tcolorTemp += clamp(-oneMinus2t, 0.0, 1.0) * %s;\n",
                                builder->getUniformVariable(fColorEndUni).c_str());
         if (GrGradientEffect::kAfterInterp_PremulType == PremulTypeFromKey(key)) {
             builder->fsCodeAppend("\tcolorTemp.rgb *= colorTemp.a;\n");
         }
 
         SkString output;
         builder->fsCodeAppendf("\t%s = ", outputColor);
         GrGLSLModulatef<4>(&output, inputColor, "colorTemp");
         builder->fsCodeAppend(output.c_str());
         builder->fsCodeAppend(";\n");
@@ skipping 149 matching lines @@
             (*stops)[i] = stop;
             stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f;
         }
     }
     *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount));
 
     return outColors;
 }
 
 #endif