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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 <string>
#include <vector>
#include "base/basictypes.h"
#include "base/logging.h"
#include "printing/printing_export.h"
#include "ui/gfx/geometry/size.h"
namespace base {
class FilePath;
namespace printing {
class Metafile;
// Lightweight raw-bitmap management. The image, once initialized, is immutable.
// The main purpose is testing image contents.
// Creates the image from the given file on disk. Uses extension to
// defer file type. PNG and EMF (on Windows) currently supported.
// If image loading fails size().IsEmpty() will be true.
explicit Image(const base::FilePath& path);
// Creates the image from the metafile. Deduces bounds based on bounds in
// metafile. If loading fails size().IsEmpty() will be true.
explicit Image(const Metafile& metafile);
// Copy constructor.
explicit Image(const Image& image);
const gfx::Size& size() const {
return size_;
// Return a checksum of the image (MD5 over the internal data structure).
std::string checksum() const;
// Save image as PNG.
bool SaveToPng(const base::FilePath& filepath) const;
// Returns % of pixels different
double PercentageDifferent(const Image& rhs) const;
// Returns the 0x0RGB or 0xARGB value of the pixel at the given location.
uint32 Color(uint32 color) const {
if (ignore_alpha_)
return color & 0xFFFFFF; // Strip out A.
return color;
uint32 pixel_at(int x, int y) const {
DCHECK(x >= 0 && x < size_.width());
DCHECK(y >= 0 && y < size_.height());
const uint32* data = reinterpret_cast<const uint32*>(&*data_.begin());
const uint32* data_row = data + y * row_length_ / sizeof(uint32);
return Color(data_row[x]);
// Construct from metafile. This is kept internal since it's ambiguous what
// kind of data is used (png, bmp, metafile etc).
Image(const void* data, size_t size);
bool LoadPng(const std::string& compressed);
bool LoadMetafile(const std::string& data);
bool LoadMetafile(const Metafile& metafile);
// Pixel dimensions of the image.
gfx::Size size_;
// Length of a line in bytes.
int row_length_;
// Actual bitmap data in arrays of RGBAs (so when loaded as uint32, it's
// 0xABGR).
std::vector<unsigned char> data_;
// Flag to signal if the comparison functions should ignore the alpha channel.
const bool ignore_alpha_; // Currently always true.
// Prevent operator= (this function has no implementation)
Image& operator=(const Image& image);
} // namespace printing