Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 1 | // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "printing/image.h" |
| 6 | |
| 7 | #include <algorithm> |
| 8 | |
| 9 | #include "base/file_util.h" |
| 10 | #include "base/md5.h" |
Torne (Richard Coles) | 2a99a7e | 2013-03-28 15:31:22 +0000 | [diff] [blame] | 11 | #include "base/safe_numerics.h" |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 12 | #include "base/strings/string_number_conversions.h" |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 13 | #include "printing/metafile.h" |
| 14 | #include "printing/metafile_impl.h" |
| 15 | #include "third_party/skia/include/core/SkColor.h" |
| 16 | #include "ui/gfx/codec/png_codec.h" |
| 17 | |
| 18 | namespace printing { |
| 19 | |
Torne (Richard Coles) | 2a99a7e | 2013-03-28 15:31:22 +0000 | [diff] [blame] | 20 | Image::Image(const base::FilePath& path) |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 21 | : row_length_(0), |
| 22 | ignore_alpha_(true) { |
| 23 | std::string data; |
| 24 | file_util::ReadFileToString(path, &data); |
| 25 | bool success = false; |
| 26 | if (path.MatchesExtension(FILE_PATH_LITERAL(".png"))) { |
| 27 | success = LoadPng(data); |
| 28 | } else if (path.MatchesExtension(FILE_PATH_LITERAL(".emf"))) { |
| 29 | success = LoadMetafile(data); |
| 30 | } else { |
| 31 | DCHECK(false); |
| 32 | } |
| 33 | if (!success) { |
| 34 | size_.SetSize(0, 0); |
| 35 | row_length_ = 0; |
| 36 | data_.clear(); |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | Image::Image(const Metafile& metafile) |
| 41 | : row_length_(0), |
| 42 | ignore_alpha_(true) { |
| 43 | LoadMetafile(metafile); |
| 44 | } |
| 45 | |
| 46 | Image::Image(const Image& image) |
| 47 | : size_(image.size_), |
| 48 | row_length_(image.row_length_), |
| 49 | data_(image.data_), |
| 50 | ignore_alpha_(image.ignore_alpha_) { |
| 51 | } |
| 52 | |
| 53 | Image::~Image() {} |
| 54 | |
| 55 | std::string Image::checksum() const { |
| 56 | base::MD5Digest digest; |
| 57 | base::MD5Sum(&data_[0], data_.size(), &digest); |
| 58 | return base::HexEncode(&digest, sizeof(digest)); |
| 59 | } |
| 60 | |
Torne (Richard Coles) | 2a99a7e | 2013-03-28 15:31:22 +0000 | [diff] [blame] | 61 | bool Image::SaveToPng(const base::FilePath& filepath) const { |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 62 | DCHECK(!data_.empty()); |
| 63 | std::vector<unsigned char> compressed; |
| 64 | bool success = gfx::PNGCodec::Encode(&*data_.begin(), |
| 65 | gfx::PNGCodec::FORMAT_BGRA, |
| 66 | size_, |
| 67 | row_length_, |
| 68 | true, |
| 69 | std::vector<gfx::PNGCodec::Comment>(), |
| 70 | &compressed); |
| 71 | DCHECK(success && compressed.size()); |
| 72 | if (success) { |
| 73 | int write_bytes = file_util::WriteFile( |
| 74 | filepath, |
Torne (Richard Coles) | 2a99a7e | 2013-03-28 15:31:22 +0000 | [diff] [blame] | 75 | reinterpret_cast<char*>(&*compressed.begin()), |
| 76 | base::checked_numeric_cast<int>(compressed.size())); |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 77 | success = (write_bytes == static_cast<int>(compressed.size())); |
| 78 | DCHECK(success); |
| 79 | } |
| 80 | return success; |
| 81 | } |
| 82 | |
| 83 | double Image::PercentageDifferent(const Image& rhs) const { |
| 84 | if (size_.width() == 0 || size_.height() == 0 || |
| 85 | rhs.size_.width() == 0 || rhs.size_.height() == 0) |
| 86 | return 100.; |
| 87 | |
| 88 | int width = std::min(size_.width(), rhs.size_.width()); |
| 89 | int height = std::min(size_.height(), rhs.size_.height()); |
| 90 | // Compute pixels different in the overlap |
| 91 | int pixels_different = 0; |
| 92 | for (int y = 0; y < height; ++y) { |
| 93 | for (int x = 0; x < width; ++x) { |
| 94 | uint32 lhs_pixel = pixel_at(x, y); |
| 95 | uint32 rhs_pixel = rhs.pixel_at(x, y); |
| 96 | if (lhs_pixel != rhs_pixel) |
| 97 | ++pixels_different; |
| 98 | } |
| 99 | |
| 100 | // Look for extra right lhs pixels. They should be white. |
| 101 | for (int x = width; x < size_.width(); ++x) { |
| 102 | uint32 lhs_pixel = pixel_at(x, y); |
| 103 | if (lhs_pixel != Color(SK_ColorWHITE)) |
| 104 | ++pixels_different; |
| 105 | } |
| 106 | |
| 107 | // Look for extra right rhs pixels. They should be white. |
| 108 | for (int x = width; x < rhs.size_.width(); ++x) { |
| 109 | uint32 rhs_pixel = rhs.pixel_at(x, y); |
| 110 | if (rhs_pixel != Color(SK_ColorWHITE)) |
| 111 | ++pixels_different; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | // Look for extra bottom lhs pixels. They should be white. |
| 116 | for (int y = height; y < size_.height(); ++y) { |
| 117 | for (int x = 0; x < size_.width(); ++x) { |
| 118 | uint32 lhs_pixel = pixel_at(x, y); |
| 119 | if (lhs_pixel != Color(SK_ColorWHITE)) |
| 120 | ++pixels_different; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | // Look for extra bottom rhs pixels. They should be white. |
| 125 | for (int y = height; y < rhs.size_.height(); ++y) { |
| 126 | for (int x = 0; x < rhs.size_.width(); ++x) { |
| 127 | uint32 rhs_pixel = rhs.pixel_at(x, y); |
| 128 | if (rhs_pixel != Color(SK_ColorWHITE)) |
| 129 | ++pixels_different; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | // Like the WebKit ImageDiff tool, we define percentage different in terms |
| 134 | // of the size of the 'actual' bitmap. |
| 135 | double total_pixels = static_cast<double>(size_.width()) * |
| 136 | static_cast<double>(height); |
| 137 | return static_cast<double>(pixels_different) / total_pixels * 100.; |
| 138 | } |
| 139 | |
| 140 | bool Image::LoadPng(const std::string& compressed) { |
| 141 | int w; |
| 142 | int h; |
| 143 | bool success = gfx::PNGCodec::Decode( |
| 144 | reinterpret_cast<const unsigned char*>(compressed.c_str()), |
| 145 | compressed.size(), gfx::PNGCodec::FORMAT_BGRA, &data_, &w, &h); |
| 146 | size_.SetSize(w, h); |
| 147 | row_length_ = size_.width() * sizeof(uint32); |
| 148 | return success; |
| 149 | } |
| 150 | |
| 151 | bool Image::LoadMetafile(const std::string& data) { |
| 152 | DCHECK(!data.empty()); |
| 153 | NativeMetafile metafile; |
Torne (Richard Coles) | 2a99a7e | 2013-03-28 15:31:22 +0000 | [diff] [blame] | 154 | if (!metafile.InitFromData(data.data(), |
| 155 | base::checked_numeric_cast<uint32>(data.size()))) |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 156 | return false; |
| 157 | return LoadMetafile(metafile); |
| 158 | } |
| 159 | |
| 160 | } // namespace printing |