gl programs rewrite

src/effects/SkColorFilters.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 "SkBlitRow.h"
 #include "SkColorFilter.h"
 #include "SkColorPriv.h"
@@ skipping 388 matching lines @@
 
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(ModeColorFilterEffect);
 GrFragmentProcessor* ModeColorFilterEffect::TestCreate(SkRandom* rand,
                                                        GrContext*,
                                                        const GrDrawTargetCaps&,
                                                        GrTexture*[]) {
     SkXfermode::Mode mode = SkXfermode::kDst_Mode;
     while (SkXfermode::kDst_Mode == mode) {
         mode = static_cast<SkXfermode::Mode>(rand->nextRangeU(0, SkXfermode::kLastCoeffMode));
     }
-    GrColor color = rand->nextU();
+
+    // pick a random premul color
+    uint8_t alpha = rand->nextULessThan(256);
+    GrColor color = GrColorPackRGBA(rand->nextRangeU(0, alpha),
+                                    rand->nextRangeU(0, alpha),
+                                    rand->nextRangeU(0, alpha),
+                                    alpha);
     return ModeColorFilterEffect::Create(color, mode);
 }
 
 GrFragmentProcessor* SkModeColorFilter::asFragmentProcessor(GrContext*) const {
     if (SkXfermode::kDst_Mode != fMode) {
         return ModeColorFilterEffect::Create(SkColor2GrColor(fColor), fMode);
     }
     return NULL;
 }
 
@@ skipping 126 matching lines @@
     matrix.postTranslate(SkIntToScalar(SkColorGetR(add)),
                          SkIntToScalar(SkColorGetG(add)),
                          SkIntToScalar(SkColorGetB(add)),
                          0);
     return SkColorMatrixFilter::Create(matrix);
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkColorFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkModeColorFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END