Revert of clean up printing::Image and printing::Metafile

printing/image.cc

 // 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 "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/codec/png_codec.h"
 
 namespace printing {
 
-Image::Image(const void* metafile_src_buffer, size_t metafile_src_buffer_size)
-    : row_length_(0), ignore_alpha_(true) {
-  LoadMetafile(metafile_src_buffer, metafile_src_buffer_size);
+Image::Image(const Metafile& metafile)
+    : row_length_(0),
+      ignore_alpha_(true) {
+  LoadMetafile(metafile);
 }
 
-Image::Image(const Image&) = default;
-Image::Image(Image&&) = default;
+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 {
@@ skipping 10 matching lines @@
   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;
+}
+
 }  // namespace printing