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- // Copyright (c) 2011 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 "printing/image.h"
- #include <stdint.h>
- #include <algorithm>
- #include "base/files/file_util.h"
- #include "base/hash/md5.h"
- #include "base/numerics/safe_conversions.h"
- #include "base/strings/string_number_conversions.h"
- #include "printing/metafile.h"
- #include "third_party/skia/include/core/SkColor.h"
- #include "ui/gfx/codec/png_codec.h"
- namespace printing {
- Image::Image(const Metafile& metafile) : row_length_(0), ignore_alpha_(true) {
- LoadMetafile(metafile);
- }
- Image::Image(const Image& image) = default;
- Image::~Image() = default;
- std::string Image::checksum() const {
- base::MD5Digest digest;
- base::MD5Sum(&data_[0], data_.size(), &digest);
- return base::MD5DigestToBase16(digest);
- }
- bool Image::SaveToPng(const base::FilePath& filepath) const {
- DCHECK(!data_.empty());
- std::vector<unsigned char> compressed;
- bool success = gfx::PNGCodec::Encode(
- &*data_.begin(), gfx::PNGCodec::FORMAT_BGRA, size_, row_length_, true,
- std::vector<gfx::PNGCodec::Comment>(), &compressed);
- DCHECK(success && compressed.size());
- if (success) {
- success = base::WriteFile(filepath, compressed);
- DCHECK(success);
- }
- return success;
- }
- double Image::PercentageDifferent(const Image& rhs) const {
- if (size_.width() == 0 || size_.height() == 0 || rhs.size_.width() == 0 ||
- rhs.size_.height() == 0)
- return 100.;
- int width = std::min(size_.width(), rhs.size_.width());
- int height = std::min(size_.height(), rhs.size_.height());
- // Compute pixels different in the overlap
- int pixels_different = 0;
- for (int y = 0; y < height; ++y) {
- for (int x = 0; x < width; ++x) {
- uint32_t lhs_pixel = pixel_at(x, y);
- uint32_t rhs_pixel = rhs.pixel_at(x, y);
- if (lhs_pixel != rhs_pixel)
- ++pixels_different;
- }
- // Look for extra right lhs pixels. They should be white.
- for (int x = width; x < size_.width(); ++x) {
- uint32_t lhs_pixel = pixel_at(x, y);
- if (lhs_pixel != Color(SK_ColorWHITE))
- ++pixels_different;
- }
- // Look for extra right rhs pixels. They should be white.
- for (int x = width; x < rhs.size_.width(); ++x) {
- uint32_t rhs_pixel = rhs.pixel_at(x, y);
- if (rhs_pixel != Color(SK_ColorWHITE))
- ++pixels_different;
- }
- }
- // Look for extra bottom lhs pixels. They should be white.
- for (int y = height; y < size_.height(); ++y) {
- for (int x = 0; x < size_.width(); ++x) {
- uint32_t lhs_pixel = pixel_at(x, y);
- if (lhs_pixel != Color(SK_ColorWHITE))
- ++pixels_different;
- }
- }
- // Look for extra bottom rhs pixels. They should be white.
- for (int y = height; y < rhs.size_.height(); ++y) {
- for (int x = 0; x < rhs.size_.width(); ++x) {
- uint32_t rhs_pixel = rhs.pixel_at(x, y);
- if (rhs_pixel != Color(SK_ColorWHITE))
- ++pixels_different;
- }
- }
- // Like the WebKit ImageDiff tool, we define percentage different in terms
- // of the size of the 'actual' bitmap.
- double total_pixels =
- static_cast<double>(size_.width()) * static_cast<double>(height);
- return static_cast<double>(pixels_different) / total_pixels * 100.;
- }
- bool Image::LoadPng(const std::string& compressed) {
- int w;
- int h;
- bool success = gfx::PNGCodec::Decode(
- reinterpret_cast<const unsigned char*>(compressed.c_str()),
- compressed.size(), gfx::PNGCodec::FORMAT_BGRA, &data_, &w, &h);
- size_.SetSize(w, h);
- row_length_ = size_.width() * sizeof(uint32_t);
- return success;
- }
- } // namespace printing
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