Revert "Delete CC."

cc/test/pixel_test_utils.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 "cc/test/pixel_test_utils.h"
+
+#include <string>
+#include <vector>
+
+#include "base/base64.h"
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/codec/png_codec.h"
+
+namespace cc {
+
+bool WritePNGFile(const SkBitmap& bitmap, const base::FilePath& file_path,
+    bool discard_transparency) {
+  std::vector<unsigned char> png_data;
+  if (gfx::PNGCodec::EncodeBGRASkBitmap(bitmap,
+                                        discard_transparency,
+                                        &png_data) &&
+      base::CreateDirectory(file_path.DirName())) {
+    char* data = reinterpret_cast<char*>(&png_data[0]);
+    int size = static_cast<int>(png_data.size());
+    return base::WriteFile(file_path, data, size) == size;
+  }
+  return false;
+}
+
+std::string GetPNGDataUrl(const SkBitmap& bitmap) {
+  std::vector<unsigned char> png_data;
+  gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, &png_data);
+  std::string data_url;
+  data_url.insert(data_url.end(), png_data.begin(), png_data.end());
+  base::Base64Encode(data_url, &data_url);
+  data_url.insert(0, "data:image/png;base64,");
+
+  return data_url;
+}
+
+bool ReadPNGFile(const base::FilePath& file_path, SkBitmap* bitmap) {
+  DCHECK(bitmap);
+  std::string png_data;
+  return base::ReadFileToString(file_path, &png_data) &&
+         gfx::PNGCodec::Decode(reinterpret_cast<unsigned char*>(&png_data[0]),
+                               png_data.length(),
+                               bitmap);
+}
+
+bool MatchesPNGFile(const SkBitmap& gen_bmp, base::FilePath ref_img_path,
+                    const PixelComparator& comparator) {
+  SkBitmap ref_bmp;
+  if (!ReadPNGFile(ref_img_path, &ref_bmp)) {
+    LOG(ERROR) << "Cannot read reference image: " << ref_img_path.value();
+    return false;
+  }
+
+  // Check if images size matches
+  if (gen_bmp.width() != ref_bmp.width() ||
+      gen_bmp.height() != ref_bmp.height()) {
+    LOG(ERROR)
+        << "Dimensions do not match! "
+        << "Actual: " << gen_bmp.width() << "x" << gen_bmp.height()
+        << "; "
+        << "Expected: " << ref_bmp.width() << "x" << ref_bmp.height();
+    return false;
+  }
+
+  // Shortcut for empty images. They are always equal.
+  if (gen_bmp.width() == 0 || gen_bmp.height() == 0)
+    return true;
+
+  bool compare = comparator.Compare(gen_bmp, ref_bmp);
+  if (!compare) {
+    std::string gen_bmp_data_url = GetPNGDataUrl(gen_bmp);
+    std::string ref_bmp_data_url = GetPNGDataUrl(ref_bmp);
+    LOG(ERROR) << "Pixels do not match!";
+    LOG(ERROR) << "Actual: " << gen_bmp_data_url;
+    LOG(ERROR) << "Expected: " << ref_bmp_data_url;
+  }
+  return compare;
+}
+
+}  // namespace cc