image/decoders/nsJPEGDecoder.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsJPEGDecoder_h__
   8 #define nsJPEGDecoder_h__
   9
  10 #include "RasterImage.h"
  11 /* On Windows systems, RasterImage.h brings in 'windows.h', which defines INT32.
  12  * But the jpeg decoder has its own definition of INT32. To avoid build issues,
  13  * we need to undefine the version from 'windows.h'. */
  14 #undef INT32
  15
  16 #include "Decoder.h"
  17
  18 #include "nsAutoPtr.h"
  19
  20 #include "nsIInputStream.h"
  21 #include "nsIPipe.h"
  22 #include "qcms.h"
  23
  24 extern "C" {
  25 #include "jpeglib.h"
  26 }
  27
  28 #include <setjmp.h>
  29
  30 namespace mozilla {
  31 namespace image {
  32
  33 typedef struct {
  34     struct jpeg_error_mgr pub;  /* "public" fields for IJG library*/
  35     jmp_buf setjmp_buffer;      /* For handling catastropic errors */
  36 } decoder_error_mgr;
  37
  38 typedef enum {
  39     JPEG_HEADER,                          /* Reading JFIF headers */
  40     JPEG_START_DECOMPRESS,
  41     JPEG_DECOMPRESS_PROGRESSIVE,          /* Output progressive pixels */
  42     JPEG_DECOMPRESS_SEQUENTIAL,           /* Output sequential pixels */
  43     JPEG_DONE,
  44     JPEG_SINK_NON_JPEG_TRAILER,          /* Some image files have a */
  45                                          /* non-JPEG trailer */
  46     JPEG_ERROR
  47 } jstate;
  48
  49 class RasterImage;
  50 struct Orientation;
  51
  52 class nsJPEGDecoder : public Decoder
  53 {
  54 public:
  55   nsJPEGDecoder(RasterImage &aImage, Decoder::DecodeStyle aDecodeStyle);
  56   virtual ~nsJPEGDecoder();
  57
  58   virtual void InitInternal();
  59   virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy);
  60   virtual void FinishInternal();
  61
  62   virtual Telemetry::ID SpeedHistogram();
  63   void NotifyDone();
  64
  65 protected:
  66   Orientation ReadOrientationFromEXIF();
  67   void OutputScanlines(bool* suspend);
  68
  69 public:
  70   struct jpeg_decompress_struct mInfo;
  71   struct jpeg_source_mgr mSourceMgr;
  72   decoder_error_mgr mErr;
  73   jstate mState;
  74
  75   uint32_t mBytesToSkip;
  76
  77   const JOCTET *mSegment;   // The current segment we are decoding from
  78   uint32_t mSegmentLen;     // amount of data in mSegment
  79
  80   JOCTET *mBackBuffer;
  81   uint32_t mBackBufferLen; // Offset of end of active backtrack data
  82   uint32_t mBackBufferSize; // size in bytes what mBackBuffer was created with
  83   uint32_t mBackBufferUnreadLen; // amount of data currently in mBackBuffer
  84
  85   JOCTET  *mProfile;
  86   uint32_t mProfileLength;
  87
  88   qcms_profile *mInProfile;
  89   qcms_transform *mTransform;
  90
  91   bool mReading;
  92
  93   const Decoder::DecodeStyle mDecodeStyle;
  94
  95   uint32_t mCMSMode;
  96 };
  97
  98 } // namespace image
  99 } // namespace mozilla
 100
 101 #endif // nsJPEGDecoder_h__