1 
2 /*
3  * Copyright 2010 The Android Open Source Project
4  *
5  * Use of this source code is governed by a BSD-style license that can be
6  * found in the LICENSE file.
7  */
8 
9 
10 #ifndef SkJpegUtility_DEFINED
11 #define SkJpegUtility_DEFINED
12 
13 #include "SkImageDecoder.h"
14 #include "SkStream.h"
15 
16 extern "C" {
17     #include "jpeglib.h"
18     #include "jerror.h"
19 }
20 
21 #include <setjmp.h>
22 
23 /* Our error-handling struct.
24  *
25 */
26 struct skjpeg_error_mgr : jpeg_error_mgr {
27     jmp_buf fJmpBuf;
28 };
29 
30 
31 void skjpeg_error_exit(j_common_ptr cinfo);
32 
33 ///////////////////////////////////////////////////////////////////////////
34 /* Our source struct for directing jpeg to our stream object.
35 */
36 struct skjpeg_source_mgr : jpeg_source_mgr {
37     skjpeg_source_mgr(SkStream* stream, SkImageDecoder* decoder);
38 
39     // Unowned.
40     SkStream*       fStream;
41     // Unowned pointer to the decoder, used to check if the decoding process
42     // has been cancelled.
43     SkImageDecoder* fDecoder;
44     enum {
45         kBufferSize = 1024
46     };
47     char    fBuffer[kBufferSize];
48 };
49 
50 /////////////////////////////////////////////////////////////////////////////
51 /* Our destination struct for directing decompressed pixels to our stream
52  * object.
53  */
54 struct skjpeg_destination_mgr : jpeg_destination_mgr {
55     skjpeg_destination_mgr(SkWStream* stream);
56 
57     SkWStream*  fStream;
58 
59     enum {
60         kBufferSize = 1024
61     };
62     uint8_t fBuffer[kBufferSize];
63 };
64 
65 #endif
66