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// 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/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
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