| // 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/md5.h" |
| #include "base/numerics/safe_conversions.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "printing/metafile.h" |
| #include "printing/pdf_metafile_skia.h" |
| #include "third_party/skia/include/core/SkColor.h" |
| #include "ui/gfx/codec/png_codec.h" |
| |
| namespace printing { |
| |
| Image::Image(const base::FilePath& path) |
| : row_length_(0), |
| ignore_alpha_(true) { |
| std::string data; |
| base::ReadFileToString(path, &data); |
| bool success = false; |
| if (path.MatchesExtension(FILE_PATH_LITERAL(".png"))) { |
| success = LoadPng(data); |
| } else if (path.MatchesExtension(FILE_PATH_LITERAL(".emf"))) { |
| success = LoadMetafile(data); |
| } else { |
| DCHECK(false); |
| } |
| if (!success) { |
| size_.SetSize(0, 0); |
| row_length_ = 0; |
| data_.clear(); |
| } |
| } |
| |
| Image::Image(const Metafile& metafile) |
| : row_length_(0), |
| ignore_alpha_(true) { |
| LoadMetafile(metafile); |
| } |
| |
| Image::Image(const Image& image) |
| : size_(image.size_), |
| row_length_(image.row_length_), |
| data_(image.data_), |
| ignore_alpha_(image.ignore_alpha_) { |
| } |
| |
| Image::~Image() {} |
| |
| 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) { |
| int write_bytes = base::WriteFile( |
| filepath, |
| reinterpret_cast<char*>(&*compressed.begin()), |
| base::checked_cast<int>(compressed.size())); |
| success = (write_bytes == static_cast<int>(compressed.size())); |
| 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; |
| } |
| |
| bool Image::LoadMetafile(const std::string& data) { |
| DCHECK(!data.empty()); |
| PdfMetafileSkia metafile; |
| if (!metafile.InitFromData(data.data(), |
| base::checked_cast<uint32_t>(data.size()))) |
| return false; |
| return LoadMetafile(metafile); |
| } |
| |
| } // namespace printing |