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

base/gfx/jpeg_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/jpeg_codec.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-// out of 100, this indicates how compressed it will be, this should be changed
-// with jpeg equality threshold
-// static int jpeg_quality = 75;  // FIXME(brettw)
-static int jpeg_quality = 100;
-
-// The threshold of average color differences where we consider two images
-// equal. This number was picked to be a little above the observed difference
-// using the above quality.
-static double jpeg_equality_threshold = 1.0;
-
-// Computes the average difference between each value in a and b. A and b
-// should be the same size. Used to see if two images are approximately equal
-// in the presence of compression.
-static double AveragePixelDelta(const std::vector<unsigned char>& a,
-                                const std::vector<unsigned char>& b) {
-  // if the sizes are different, say the average difference is the maximum
-  if (a.size() != b.size())
-    return 255.0;
-  if (a.size() == 0)
-    return 0;  // prevent divide by 0 below
-
-  double acc = 0.0;
-  for (size_t i = 0; i < a.size(); i++)
-    acc += fabs(static_cast<double>(a[i]) - static_cast<double>(b[i]));
-
-  return acc / static_cast<double>(a.size());
-}
-
-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
-    }
-  }
-}
-
-TEST(JPEGCodec, EncodeDecodeRGB) {
-  int w = 20, h = 20;
-
-  // create an image with known values
-  std::vector<unsigned char> original;
-  MakeRGBImage(w, h, &original);
-
-  // encode, making sure it was compressed some
-  std::vector<unsigned char> encoded;
-  EXPECT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGB, w, h,
-                                w * 3, jpeg_quality, &encoded));
-  EXPECT_GT(original.size(), encoded.size());
-
-  // decode, it should have the same size as the original
-  std::vector<unsigned char> decoded;
-  int outw, outh;
-  EXPECT_TRUE(JPEGCodec::Decode(&encoded[0], encoded.size(),
-                                JPEGCodec::FORMAT_RGB, &decoded,
-                                &outw, &outh));
-  ASSERT_EQ(w, outw);
-  ASSERT_EQ(h, outh);
-  ASSERT_EQ(original.size(), decoded.size());
-
-  // Images must be approximately equal (compression will have introduced some
-  // minor artifacts).
-  ASSERT_GE(jpeg_equality_threshold, AveragePixelDelta(original, decoded));
-}
-
-TEST(JPEGCodec, EncodeDecodeRGBA) {
-  int w = 20, h = 20;
-
-  // create an image with known values, a must be opaque because it will be
-  // lost during compression
-  std::vector<unsigned char> original;
-  original.resize(w * h * 4);
-  for (int y = 0; y < h; y++) {
-    for (int x = 0; x < w; x++) {
-      unsigned char* org_px = &original[(y * w + x) * 4];
-      org_px[0] = x * 3;      // r
-      org_px[1] = x * 3 + 1;  // g
-      org_px[2] = x * 3 + 2;  // b
-      org_px[3] = 0xFF;       // a (opaque)
-    }
-  }
-
-  // encode, making sure it was compressed some
-  std::vector<unsigned char> encoded;
-  EXPECT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGBA, w, h,
-                                w * 4, jpeg_quality, &encoded));
-  EXPECT_GT(original.size(), encoded.size());
-
-  // decode, it should have the same size as the original
-  std::vector<unsigned char> decoded;
-  int outw, outh;
-  EXPECT_TRUE(JPEGCodec::Decode(&encoded[0], encoded.size(),
-                                JPEGCodec::FORMAT_RGBA, &decoded,
-                                &outw, &outh));
-  ASSERT_EQ(w, outw);
-  ASSERT_EQ(h, outh);
-  ASSERT_EQ(original.size(), decoded.size());
-
-  // Images must be approximately equal (compression will have introduced some
-  // minor artifacts).
-  ASSERT_GE(jpeg_equality_threshold, AveragePixelDelta(original, decoded));
-}
-
-// Test that corrupted data decompression causes failures.
-TEST(JPEGCodec, DecodeCorrupted) {
-  int w = 20, h = 20;
-
-  // 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;
-  ASSERT_FALSE(JPEGCodec::Decode(&original[0], original.size(),
-                                 JPEGCodec::FORMAT_RGB, &output,
-                                 &outw, &outh));
-
-  // make some compressed data
-  std::vector<unsigned char> compressed;
-  ASSERT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGB, w, h,
-                                w * 3, jpeg_quality, &compressed));
-
-  // try decompressing a truncated version
-  ASSERT_FALSE(JPEGCodec::Decode(&compressed[0], compressed.size() / 2,
-                                 JPEGCodec::FORMAT_RGB, &output,
-                                 &outw, &outh));
-
-  // corrupt it and try decompressing that
-  for (int i = 10; i < 30; i++)
-    compressed[i] = i;
-  ASSERT_FALSE(JPEGCodec::Decode(&compressed[0], compressed.size(),
-                                 JPEGCodec::FORMAT_RGB, &output,
-                                 &outw, &outh));
-}