Move the JPEG and PNG codecs from base/gfx to app/gfx/codec. Move the classes...

base/gfx/png_codec_unittest.cc

-// Copyright (c) 2006-2008 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 <math.h>
-
-#include "base/gfx/png_encoder.h"
-#include "base/gfx/png_decoder.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-
-static void MakeRGBImage(int w, int h, std::vector<unsigned char>* dat) {
-  dat->resize(w * h * 3);
-  for (int y = 0; y < h; y++) {
-    for (int x = 0; x < w; x++) {
-      unsigned char* org_px = &(*dat)[(y * w + x) * 3];
-      org_px[0] = x * 3;      // r
-      org_px[1] = x * 3 + 1;  // g
-      org_px[2] = x * 3 + 2;  // b
-    }
-  }
-}
-
-// Set use_transparency to write data into the alpha channel, otherwise it will
-// be filled with 0xff. With the alpha channel stripped, this should yield the
-// same image as MakeRGBImage above, so the code below can make reference
-// images for conversion testing.
-static void MakeRGBAImage(int w, int h, bool use_transparency,
-                          std::vector<unsigned char>* dat) {
-  dat->resize(w * h * 4);
-  for (int y = 0; y < h; y++) {
-    for (int x = 0; x < w; x++) {
-      unsigned char* org_px = &(*dat)[(y * w + x) * 4];
-      org_px[0] = x * 3;      // r
-      org_px[1] = x * 3 + 1;  // g
-      org_px[2] = x * 3 + 2;  // b
-      if (use_transparency)
-        org_px[3] = x*3 + 3;  // a
-      else
-        org_px[3] = 0xFF;     // a (opaque)
-    }
-  }
-}
-
-// Returns true if each channel of the given two colors are "close." This is
-// used for comparing colors where rounding errors may cause off-by-one.
-bool ColorsClose(uint32_t a, uint32_t b) {
-  return abs(static_cast<int>(SkColorGetB(a) - SkColorGetB(b))) < 2 &&
-         abs(static_cast<int>(SkColorGetG(a) - SkColorGetG(b))) < 2 &&
-         abs(static_cast<int>(SkColorGetR(a) - SkColorGetR(b))) < 2 &&
-         abs(static_cast<int>(SkColorGetA(a) - SkColorGetA(b))) < 2;
-}
-
-void MakeTestSkBitmap(int w, int h, SkBitmap* bmp) {
-  bmp->setConfig(SkBitmap::kARGB_8888_Config, w, h);
-  bmp->allocPixels();
-
-  uint32_t* src_data = bmp->getAddr32(0, 0);
-  for (int i = 0; i < w * h; i++) {
-    src_data[i] = SkPreMultiplyARGB(i % 255, i % 250, i % 245, i % 240);
-  }
-}
-
-TEST(PNGCodec, EncodeDecodeRGB) {
-  const int w = 20, h = 20;
-
-  // create an image with known values
-  std::vector<unsigned char> original;
-  MakeRGBImage(w, h, &original);
-
-  // encode
-  std::vector<unsigned char> encoded;
-  EXPECT_TRUE(PNGEncoder::Encode(&original[0], PNGEncoder::FORMAT_RGB, w, h,
-                               w * 3, false, &encoded));
-
-  // decode, it should have the same size as the original
-  std::vector<unsigned char> decoded;
-  int outw, outh;
-  EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(),
-                               PNGDecoder::FORMAT_RGB, &decoded,
-                               &outw, &outh));
-  ASSERT_EQ(w, outw);
-  ASSERT_EQ(h, outh);
-  ASSERT_EQ(original.size(), decoded.size());
-
-  // Images must be equal
-  ASSERT_TRUE(original == decoded);
-}
-
-TEST(PNGCodec, EncodeDecodeRGBA) {
-  const int w = 20, h = 20;
-
-  // create an image with known values, a must be opaque because it will be
-  // lost during encoding
-  std::vector<unsigned char> original;
-  MakeRGBAImage(w, h, true, &original);
-
-  // encode
-  std::vector<unsigned char> encoded;
-  EXPECT_TRUE(PNGEncoder::Encode(&original[0], PNGEncoder::FORMAT_RGBA, w, h,
-                               w * 4, false, &encoded));
-
-  // decode, it should have the same size as the original
-  std::vector<unsigned char> decoded;
-  int outw, outh;
-  EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(),
-                               PNGDecoder::FORMAT_RGBA, &decoded,
-                               &outw, &outh));
-  ASSERT_EQ(w, outw);
-  ASSERT_EQ(h, outh);
-  ASSERT_EQ(original.size(), decoded.size());
-
-  // Images must be exactly equal
-  ASSERT_TRUE(original == decoded);
-}
-
-// Test that corrupted data decompression causes failures.
-TEST(PNGCodec, DecodeCorrupted) {
-  int w = 20, h = 20;
-
-  // Make some random data (an uncompressed image).
-  std::vector<unsigned char> original;
-  MakeRGBImage(w, h, &original);
-
-  // It should fail when given non-JPEG compressed data.
-  std::vector<unsigned char> output;
-  int outw, outh;
-  EXPECT_FALSE(PNGDecoder::Decode(&original[0], original.size(),
-                                PNGDecoder::FORMAT_RGB, &output,
-                                &outw, &outh));
-
-  // Make some compressed data.
-  std::vector<unsigned char> compressed;
-  EXPECT_TRUE(PNGEncoder::Encode(&original[0], PNGEncoder::FORMAT_RGB, w, h,
-                               w * 3, false, &compressed));
-
-  // Try decompressing a truncated version.
-  EXPECT_FALSE(PNGDecoder::Decode(&compressed[0], compressed.size() / 2,
-                                PNGDecoder::FORMAT_RGB, &output,
-                                &outw, &outh));
-
-  // Corrupt it and try decompressing that.
-  for (int i = 10; i < 30; i++)
-    compressed[i] = i;
-  EXPECT_FALSE(PNGDecoder::Decode(&compressed[0], compressed.size(),
-                                PNGDecoder::FORMAT_RGB, &output,
-                                &outw, &outh));
-}
-
-TEST(PNGCodec, EncodeDecodeBGRA) {
-  const int w = 20, h = 20;
-
-  // Create an image with known values, alpha must be opaque because it will be
-  // lost during encoding.
-  std::vector<unsigned char> original;
-  MakeRGBAImage(w, h, true, &original);
-
-  // Encode.
-  std::vector<unsigned char> encoded;
-  EXPECT_TRUE(PNGEncoder::Encode(&original[0], PNGEncoder::FORMAT_BGRA, w, h,
-                               w * 4, false, &encoded));
-
-  // Decode, it should have the same size as the original.
-  std::vector<unsigned char> decoded;
-  int outw, outh;
-  EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(),
-                               PNGDecoder::FORMAT_BGRA, &decoded,
-                               &outw, &outh));
-  ASSERT_EQ(w, outw);
-  ASSERT_EQ(h, outh);
-  ASSERT_EQ(original.size(), decoded.size());
-
-  // Images must be exactly equal.
-  ASSERT_TRUE(original == decoded);
-}
-
-TEST(PNGCodec, StripAddAlpha) {
-  const int w = 20, h = 20;
-
-  // These should be the same except one has a 0xff alpha channel.
-  std::vector<unsigned char> original_rgb;
-  MakeRGBImage(w, h, &original_rgb);
-  std::vector<unsigned char> original_rgba;
-  MakeRGBAImage(w, h, false, &original_rgba);
-
-  // Encode RGBA data as RGB.
-  std::vector<unsigned char> encoded;
-  EXPECT_TRUE(PNGEncoder::Encode(&original_rgba[0],
-                                 PNGEncoder::FORMAT_RGBA,
-                                 w, h,
-                                 w * 4, true, &encoded));
-
-  // Decode the RGB to RGBA.
-  std::vector<unsigned char> decoded;
-  int outw, outh;
-  EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(),
-                               PNGDecoder::FORMAT_RGBA, &decoded,
-                               &outw, &outh));
-
-  // Decoded and reference should be the same (opaque alpha).
-  ASSERT_EQ(w, outw);
-  ASSERT_EQ(h, outh);
-  ASSERT_EQ(original_rgba.size(), decoded.size());
-  ASSERT_TRUE(original_rgba == decoded);
-
-  // Encode RGBA to RGBA.
-  EXPECT_TRUE(PNGEncoder::Encode(&original_rgba[0],
-                                 PNGEncoder::FORMAT_RGBA,
-                                 w, h,
-                                 w * 4, false, &encoded));
-
-  // Decode the RGBA to RGB.
-  EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(),
-                               PNGDecoder::FORMAT_RGB, &decoded,
-                               &outw, &outh));
-
-  // It should be the same as our non-alpha-channel reference.
-  ASSERT_EQ(w, outw);
-  ASSERT_EQ(h, outh);
-  ASSERT_EQ(original_rgb.size(), decoded.size());
-  ASSERT_TRUE(original_rgb == decoded);
-}
-
-TEST(PNGCodec, EncodeBGRASkBitmap) {
-  const int w = 20, h = 20;
-
-  SkBitmap original_bitmap;
-  MakeTestSkBitmap(w, h, &original_bitmap);
-
-  // Encode the bitmap.
-  std::vector<unsigned char> encoded;
-  PNGEncoder::EncodeBGRASkBitmap(original_bitmap, false, &encoded);
-
-  // Decode the encoded string.
-  SkBitmap decoded_bitmap;
-  EXPECT_TRUE(PNGDecoder::Decode(&encoded, &decoded_bitmap));
-
-  // Compare the original bitmap and the output bitmap. We use ColorsClose
-  // as SkBitmaps are considered to be pre-multiplied, the unpremultiplication
-  // (in Encode) and repremultiplication (in Decode) can be lossy.
-  for (int x = 0; x < w; x++) {
-    for (int y = 0; y < h; y++) {
-      uint32_t original_pixel = original_bitmap.getAddr32(0, y)[x];
-      uint32_t decoded_pixel = decoded_bitmap.getAddr32(0, y)[x];
-      EXPECT_TRUE(ColorsClose(original_pixel, decoded_pixel));
-    }
-  }
-}
-