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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.
- #ifndef PRINTING_IMAGE_H_
- #define PRINTING_IMAGE_H_
- #include <stddef.h>
- #include <stdint.h>
- #include <string>
- #include <vector>
- #include "base/check.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.
- class Image {
- public:
- // 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);
- ~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_t Color(uint32_t color) const {
- if (ignore_alpha_)
- return color & 0xFFFFFF; // Strip out A.
- else
- return color;
- }
- uint32_t pixel_at(int x, int y) const {
- DCHECK(x >= 0 && x < size_.width());
- DCHECK(y >= 0 && y < size_.height());
- const uint32_t* data = reinterpret_cast<const uint32_t*>(&*data_.begin());
- const uint32_t* data_row = data + y * row_length_ / sizeof(uint32_t);
- return Color(data_row[x]);
- }
- private:
- // 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);
- // Loads the first page from `metafile`.
- 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_t, 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
- #endif // PRINTING_IMAGE_H_
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