ui/gfx/chromeos/codec/jpeg_codec_robust_slow.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GFX_CHROMEOS_CODEC_JPEG_CODEC_ROBUST_SLOW_H_
   6 #define UI_GFX_CHROMEOS_CODEC_JPEG_CODEC_ROBUST_SLOW_H_
   7
   8 #include <stddef.h>
   9 #include <vector>
  10
  11 #include "ui/gfx/gfx_export.h"
  12
  13 class SkBitmap;
  14
  15 namespace gfx {
  16
  17 // Interface for encoding/decoding JPEG data. This is a wrapper around libjpeg,
  18 // which has an inconvenient interface for callers. This is only used for
  19 // servicing ChromeUtilityMsg_RobustJPEGDecodeImage and is currently unique
  20 // to Chrome OS.
  21 class GFX_EXPORT JPEGCodecRobustSlow {
  22  public:
  23   enum ColorFormat {
  24     // 3 bytes per pixel (packed), in RGB order regardless of endianness.
  25     // This is the native JPEG format.
  26     FORMAT_RGB,
  27
  28     // 4 bytes per pixel, in RGBA order in mem regardless of endianness.
  29     FORMAT_RGBA,
  30
  31     // 4 bytes per pixel, in BGRA order in mem regardless of endianness.
  32     // This is the default Windows DIB order.
  33     FORMAT_BGRA,
  34
  35     // 4 bytes per pixel, it can be either RGBA or BGRA. It depends on the bit
  36     // order in kARGB_8888_Config skia bitmap.
  37     FORMAT_SkBitmap
  38   };
  39
  40   // Decodes the JPEG data contained in input of length input_size. The
  41   // decoded data will be placed in *output with the dimensions in *w and *h
  42   // on success (returns true). This data will be written in the'format'
  43   // format. On failure, the values of these output variables is undefined.
  44   static bool Decode(const unsigned char* input, size_t input_size,
  45                      ColorFormat format, std::vector<unsigned char>* output,
  46                      int* w, int* h);
  47
  48   // Decodes the JPEG data contained in input of length input_size. If
  49   // successful, a SkBitmap is created and returned. It is up to the caller
  50   // to delete the returned bitmap.
  51   static SkBitmap* Decode(const unsigned char* input, size_t input_size);
  52 };
  53
  54 }  // namespace gfx
  55
  56 #endif  // UI_GFX_CHROMEOS_CODEC_JPEG_CODEC_ROBUST_SLOW_H_