Add support for PNG representation in gfx::Image

ui/gfx/image/image_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/image/image_unittest_util.h"
 
 #if defined(TOOLKIT_GTK)
@@ skipping 75 matching lines @@
 
   const SkBitmap* bitmap1 = image.ToSkBitmap();
   EXPECT_FALSE(bitmap1->isNull());
   EXPECT_EQ(1U, image.RepresentationCount());
 
   EXPECT_TRUE(image.HasRepresentation(gfx::Image::kImageRepSkia));
   if (!kUsesSkiaNatively)
     EXPECT_FALSE(image.HasRepresentation(gt::GetPlatformRepresentationType()));
 }
 
+TEST_F(ImageTest, SkiaToPNGEncodeAndDecode) {
+  gfx::Image image(gt::CreateBitmap(25, 25));
+  const std::vector<unsigned char>* png = image.ToImagePNG();
+  EXPECT_TRUE(png);
+  EXPECT_FALSE(png->empty());
+  EXPECT_TRUE(image.HasRepresentation(gfx::Image::kImageRepPNG));
+
+  gfx::Image from_png(*png);
+  EXPECT_TRUE(image.HasRepresentation(gfx::Image::kImageRepPNG));
+  EXPECT_TRUE(image.HasRepresentation(gfx::Image::kImageRepSkia));
+  EXPECT_TRUE(gt::IsEqual(from_png, image));
+}
+
+TEST_F(ImageTest, PlatformToPNGEncodeAndDecode) {
+  gfx::Image image(gt::CreatePlatformImage());
+  const std::vector<unsigned char>* png = image.ToImagePNG();
+  EXPECT_TRUE(png);
+  EXPECT_FALSE(png->empty());
+  EXPECT_TRUE(image.HasRepresentation(gfx::Image::kImageRepPNG));
+
+  gfx::Image from_png(*png);
+  EXPECT_TRUE(image.HasRepresentation(gfx::Image::kImageRepPNG));
+  EXPECT_TRUE(image.HasRepresentation(gt::GetPlatformRepresentationType()));
+  EXPECT_TRUE(gt::IsPlatformImageValid(gt::ToPlatformType(image)));
+}
+
+
 TEST_F(ImageTest, SkiaToPlatform) {
   gfx::Image image(gt::CreateBitmap(25, 25));
   const size_t kRepCount = kUsesSkiaNatively ? 1U : 2U;
 
   EXPECT_TRUE(image.HasRepresentation(gfx::Image::kImageRepSkia));
   if (!kUsesSkiaNatively)
     EXPECT_FALSE(image.HasRepresentation(gt::GetPlatformRepresentationType()));
 
   EXPECT_TRUE(gt::IsPlatformImageValid(gt::ToPlatformType(image)));
   EXPECT_EQ(kRepCount, image.RepresentationCount());
@@ skipping 209 matching lines @@
     image = gfx::Image(gfx::ImageSkiaRep(bitmap, ui::SCALE_FACTOR_100P));
   }
   EXPECT_TRUE(!image.ToSkBitmap()->isNull());
 }
 
 // Integration tests with UI toolkit frameworks require linking against the
 // Views library and cannot be here (gfx_unittests doesn't include it). They
 // instead live in /chrome/browser/ui/tests/ui_gfx_image_unittest.cc.
 
 }  // namespace