gm self-test: make all test cases exercise transparency

gm/selftest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /**
  * Pathologically simple drawing tests, designed to generate consistent
  * output images across platforms for gm/tests/run.sh
@@ skipping 23 matching lines @@
         canvas->drawRectCoords(0, 0, SkIntToScalar(kWidth), SkIntToScalar(kHeight), paint);
     }
 
 private:
     const SkString fName;
     const SkColor fColor;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
-static skiagm::GM* F1(void*) { return new SelfTestGM("selftest1", SK_ColorGREEN); }
-static skiagm::GM* F2(void*) { return new SelfTestGM("selftest2", SK_ColorBLUE); }
+// We use translucent colors to make sure we are properly handling cases like
+// those which caused https://code.google.com/p/skia/issues/detail?id=1079
+// ('gm generating spurious pixel_error messages as of r7258')
+static SkColor kTranslucentGreen = 0x7700EE00;
+static SkColor kTranslucentBlue  = 0x770000DD;
+
+static skiagm::GM* F1(void*) { return new SelfTestGM("selftest1", kTranslucentGreen); }
+static skiagm::GM* F2(void*) { return new SelfTestGM("selftest2", kTranslucentBlue); }
 
 static skiagm::GMRegistry gR1(F1);
 static skiagm::GMRegistry gR2(F2);