Avoid bitmap copy in SkMakeBitmapShader, fix hwui unit test

tests/ShaderTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 #include "SkBitmap.h"
 #include "SkImage.h"
@@ skipping 37 matching lines @@
     const SkMatrix localM = SkMatrix::MakeScale(2, 3);
     const SkShader::TileMode tmx = SkShader::kRepeat_TileMode;
     const SkShader::TileMode tmy = SkShader::kMirror_TileMode;
 
     auto shader0 = SkShader::MakeBitmapShader(bm, tmx, tmy, &localM);
     auto shader1 = SkImage::MakeFromBitmap(bm)->makeShader(tmx, tmy, &localM);
 
     check_isabitmap(reporter, shader0.get(), W, H, tmx, tmy, localM);
     check_isabitmap(reporter, shader1.get(), W, H, tmx, tmy, localM);
 }
+
+static void create_bitmap(SkBitmap* bitmap) {
+    SkImageInfo info = SkImageInfo::Make(1, 1, kN32_SkColorType, kPremul_SkAlphaType);
+    bitmap->setInfo(info);
+    bitmap->allocPixels(info);
+}
+
+DEF_TEST(Shader_AndroidFramework, r) {
+    SkBitmap origBitmap;
+    create_bitmap(&origBitmap);
+    //origBitmap.setImmutable();
+    sk_sp<SkShader> s = SkShader::MakeBitmapShader(origBitmap, SkShader::kClamp_TileMode,

[reed1, 2016/09/20 17:19:06]

Tests are allowed to call private APIs, e.g. SkImagePriv.h

+                                                   SkShader::kRepeat_TileMode);
+
+    SkBitmap bitmap;
+    SkShader::TileMode xy[2];
+    REPORTER_ASSERT(r, s->isABitmap(&bitmap, nullptr, xy));
+    REPORTER_ASSERT(r, SkShader::kClamp_TileMode == xy[0]);
+    REPORTER_ASSERT(r, SkShader::kRepeat_TileMode == xy[1]);
+    REPORTER_ASSERT(r, origBitmap.pixelRef() == bitmap.pixelRef());
+}