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 #ifndef SkJpegDecoderMgr_DEFINED
9 #define SkJpegDecoderMgr_DEFINED
10 
11 #include "SkCodec.h"
12 #include "SkCodecPriv.h"
13 #include <stdio.h>
14 #include "SkJpegUtility.h"
15 
16 extern "C" {
17     #include "jpeglib.h"
18 }
19 
20 class JpegDecoderMgr : SkNoncopyable {
21 public:
22 
23     /*
24      * Print a useful error message and return false
25      */
26     bool returnFalse(const char caller[]);
27 
28     /*
29      * Print a useful error message and return a decode failure
30      */
31     SkCodec::Result returnFailure(const char caller[], SkCodec::Result result);
32 
33     /*
34      * Create the decode manager
35      * Does not take ownership of stream
36      */
37     JpegDecoderMgr(SkStream* stream);
38 
39     /*
40      * Initialize decompress struct
41      * Initialize the source manager
42      */
43     void  init();
44 
45     /*
46      * Returns true if it successfully sets outColor to the encoded color,
47      * and false otherwise.
48      */
49     bool getEncodedColor(SkEncodedInfo::Color* outColor);
50 
51     /*
52      * Free memory used by the decode manager
53      */
54     ~JpegDecoderMgr();
55 
56     /*
57      * Get the skjpeg_error_mgr in order to set an error return jmp_buf
58      */
59     skjpeg_error_mgr* errorMgr() { return &fErrorMgr; }
60 
61     /*
62      * Get function for the decompress info struct
63      */
64     jpeg_decompress_struct* dinfo() { return &fDInfo; }
65 
66 private:
67 
68     jpeg_decompress_struct fDInfo;
69     skjpeg_source_mgr      fSrcMgr;
70     skjpeg_error_mgr       fErrorMgr;
71     jpeg_progress_mgr      fProgressMgr;
72     bool                   fInit;
73 };
74 
75 #endif
76