SkJpegUtility.h revision c1d0312b227328bee7240d1df4ceee55cf6e1858 
1/*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8
9#ifndef SkJpegUtility_codec_DEFINED
10#define SkJpegUtility_codec_DEFINED
11
12#include "SkStream.h"
13
14#include <setjmp.h>
15// stdio is needed for jpeglib
16#include <stdio.h>
17
18extern "C" {
19    #include "jpeglib.h"
20    #include "jerror.h"
21}
22
23/*
24 * Error handling struct
25 */
26struct skjpeg_error_mgr : jpeg_error_mgr {
27    jmp_buf fJmpBuf;
28};
29
30/*
31 * Error handling function
32 */
33void skjpeg_err_exit(j_common_ptr cinfo);
34
35/*
36 * Source handling struct for that allows libjpeg to use our stream object
37 */
38struct skjpeg_source_mgr : jpeg_source_mgr {
39    skjpeg_source_mgr(SkStream* stream);
40
41    SkStream* fStream; // unowned
42    enum {
43        // TODO (msarett): Experiment with different buffer sizes.
44        // This size was chosen because it matches SkImageDecoder.
45        kBufferSize = 1024
46    };
47    uint8_t fBuffer[kBufferSize];
48};
49
50#endif
51