ui/gfx/image/image_util_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 "ui/gfx/image/image_util.h"

#include <vector>

#include "base/memory/scoped_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkRect.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_unittest_util.h"

TEST(ImageUtilTest, JPEGEncodeAndDecode) {
  gfx::Image original = gfx::test::CreateImage(100, 100);

  std::vector<unsigned char> encoded;
  ASSERT_TRUE(gfx::JPEG1xEncodedDataFromImage(original, 80, &encoded));

  gfx::Image decoded =
      gfx::ImageFrom1xJPEGEncodedData(&encoded.front(), encoded.size());

  // JPEG is lossy, so simply check that the image decoded successfully.
  EXPECT_FALSE(decoded.IsEmpty());
}

TEST(ImageUtilTest, TestVisibleMargins) {
  // Image with non-transparent piece should return margins at those
  // columns.
  SkBitmap bitmap1;
  bitmap1.allocN32Pixels(16, 16);
  bitmap1.eraseColor(SK_ColorTRANSPARENT);
  bitmap1.eraseArea(SkIRect::MakeLTRB(3, 3, 14, 14), SK_ColorYELLOW);
  gfx::ImageSkia img = gfx::ImageSkia::CreateFrom1xBitmap(bitmap1);
  int x = 0;
  int y = 0;
  gfx::VisibleMargins(img, &x, &y);
  EXPECT_EQ(3, x);
  EXPECT_EQ(13, y);
  EXPECT_EQ(16, img.width());

  // Full-width-transparent image should return margins in the center
  // of the image.
  SkBitmap bitmap2;
  bitmap2.allocN32Pixels(16, 16);
  bitmap2.eraseColor(SK_ColorTRANSPARENT);
  gfx::ImageSkia img_transparent = gfx::ImageSkia::CreateFrom1xBitmap(bitmap2);
  x = 0;
  y = 0;
  gfx::VisibleMargins(img_transparent, &x, &y);
  EXPECT_EQ(8, x);
  EXPECT_EQ(9, y);
  EXPECT_EQ(16, img_transparent.width());

  // Image with non-transparent piece that is skewed to one side should
  // return margins at those columns.
  SkBitmap bitmap3;
  bitmap3.allocN32Pixels(16, 16);
  bitmap3.eraseColor(SK_ColorTRANSPARENT);
  bitmap3.eraseArea(SkIRect::MakeLTRB(3, 3, 5, 5), SK_ColorYELLOW);
  gfx::ImageSkia img3 = gfx::ImageSkia::CreateFrom1xBitmap(bitmap3);
  x = 0;
  y = 0;
  gfx::VisibleMargins(img3, &x, &y);
  EXPECT_EQ(3, x);
  EXPECT_EQ(4, y);
  EXPECT_EQ(16, img3.width());

  // Image with non-transparent piece that is at one edge should
  // return margins at those columns.
  SkBitmap bitmap4;
  bitmap4.allocN32Pixels(16, 16);
  bitmap4.eraseColor(SK_ColorTRANSPARENT);
  bitmap4.eraseArea(SkIRect::MakeLTRB(0, 3, 5, 5), SK_ColorYELLOW);
  gfx::ImageSkia img4 = gfx::ImageSkia::CreateFrom1xBitmap(bitmap4);
  x = 0;
  y = 0;
  gfx::VisibleMargins(img4, &x, &y);
  EXPECT_EQ(0, x);
  EXPECT_EQ(4, y);
  EXPECT_EQ(16, img4.width());

  // Image with non-transparent piece that is at trailing edge should
  // return margins at those columns.
  SkBitmap bitmap5;
  bitmap5.allocN32Pixels(16, 16);
  bitmap5.eraseColor(SK_ColorTRANSPARENT);
  bitmap5.eraseArea(SkIRect::MakeLTRB(4, 3, 16, 16), SK_ColorYELLOW);
  gfx::ImageSkia img5 = gfx::ImageSkia::CreateFrom1xBitmap(bitmap5);
  x = 0;
  y = 0;
  gfx::VisibleMargins(img5, &x, &y);
  EXPECT_EQ(4, x);
  EXPECT_EQ(15, y);
  EXPECT_EQ(16, img5.width());
}