ui/gfx/codec/chromeos/jpeg_codec_robust_slow.h

// Copyright 2015 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 UI_GFX_CODEC_CHROMEOS_JPEG_CODEC_ROBUST_SLOW_H_
#define UI_GFX_CODEC_CHROMEOS_JPEG_CODEC_ROBUST_SLOW_H_

#include <stddef.h>
#include <vector>

#include "ui/gfx/codec/codec_export.h"

class SkBitmap;

namespace gfx {

// Interface for encoding/decoding JPEG data. This is a wrapper around libjpeg,
// which has an inconvenient interface for callers. This is only used for
// servicing ChromeUtilityMsg_RobustJPEGDecodeImage and is currently unique
// to Chrome OS.
class CODEC_EXPORT JPEGCodecRobustSlow {
 public:
  enum ColorFormat {
    // 3 bytes per pixel (packed), in RGB order regardless of endianness.
    // This is the native JPEG format.
    FORMAT_RGB,

    // 4 bytes per pixel, in RGBA order in mem regardless of endianness.
    FORMAT_RGBA,

    // 4 bytes per pixel, in BGRA order in mem regardless of endianness.
    // This is the default Windows DIB order.
    FORMAT_BGRA,

    // 4 bytes per pixel, it can be either RGBA or BGRA. It depends on the bit
    // order in kARGB_8888_Config skia bitmap.
    FORMAT_SkBitmap
  };

  // Decodes the JPEG data contained in input of length input_size. The
  // decoded data will be placed in *output with the dimensions in *w and *h
  // on success (returns true). This data will be written in the'format'
  // format. On failure, the values of these output variables is undefined.
  static bool Decode(const unsigned char* input,
                     size_t input_size,
                     ColorFormat format,
                     std::vector<unsigned char>* output,
                     int* w,
                     int* h);

  // Decodes the JPEG data contained in input of length input_size. If
  // successful, a SkBitmap is created and returned. It is up to the caller
  // to delete the returned bitmap.
  static SkBitmap* Decode(const unsigned char* input, size_t input_size);
};

}  // namespace gfx

#endif  // UI_GFX_CODEC_CHROMEOS_JPEG_CODEC_ROBUST_SLOW_H_