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// Copyright (c) 2009 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.
#ifndef PRINTING_IMAGE_H_
#define PRINTING_IMAGE_H_
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/gfx/size.h"
#include "base/logging.h"
namespace printing {
// Lightweight raw-bitmap management. The image, once initialized, is immuable.
// The main purpose is testing image contents.
class Image {
public:
// Creates the image from the given filename 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 std::wstring& filename);
const gfx::Size& size() const {
return size_;
}
// Save image as PNG.
bool SaveToPng(const std::wstring& filename);
// 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.
else
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]);
}
private:
bool LoadPng(const std::string& compressed);
bool LoadMetafile(const std::string& data);
// 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.
DISALLOW_EVIL_CONSTRUCTORS(Image);
};
} // namespace printing
#endif // PRINTING_IMAGE_H_
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