1 files changed, 160 insertions, 0 deletions
diff --git a/chromium/printing/image.cc b/chromium/printing/image.cc
new file mode 100644
index 00000000000..47ce089d302
--- /dev/null
+++ b/chromium/printing/image.cc
@@ -0,0 +1,160 @@
+// 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 <algorithm>
+
+#include "base/file_util.h"
+#include "base/md5.h"
+#include "base/safe_numerics.h"
+#include "base/strings/string_number_conversions.h"
+#include "printing/metafile.h"
+#include "printing/metafile_impl.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;
+  file_util::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::HexEncode(&digest, sizeof(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 = file_util::WriteFile(
+        filepath,
+        reinterpret_cast<char*>(&*compressed.begin()),
+        base::checked_numeric_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 lhs_pixel = pixel_at(x, y);
+      uint32 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 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 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 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 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);
+  return success;
+}
+
+bool Image::LoadMetafile(const std::string& data) {
+  DCHECK(!data.empty());
+  NativeMetafile metafile;
+  if (!metafile.InitFromData(data.data(),
+                             base::checked_numeric_cast<uint32>(data.size())))
+    return false;
+  return LoadMetafile(metafile);
+}
+
+}  // namespace printing