Simple Image Loading LibrarY  0.1.0
SILLYJPGImageContext.cpp
1 /***********************************************************************
2  filename: SILLYJPGImageContext.cpp
3  created: 11 Jun 2006
4  author: Olivier Delannoy
5 
6  purpose: Definition of the JPGImageContext class methods
7 *************************************************************************/
8 /***************************************************************************
9  * Copyright (C) 2004 - 2006 Paul D Turner & The CEGUI Development Team
10  *
11  * Permission is hereby granted, free of charge, to any person obtaining
12  * a copy of this software and associated documentation files (the
13  * "Software"), to deal in the Software without restriction, including
14  * without limitation the rights to use, copy, modify, merge, publish,
15  * distribute, sublicense, and/or sell copies of the Software, and to
16  * permit persons to whom the Software is furnished to do so, subject to
17  * the following conditions:
18  *
19  * The above copyright notice and this permission notice shall be
20  * included in all copies or substantial portions of the Software.
21  *
22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
25  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28  * OTHER DEALINGS IN THE SOFTWARE.
29  ***************************************************************************/
30 #ifdef HAVE_CONFIG_H
31 #include <config.h>
32 #endif
33 
34 #include "loaders/SILLYJPGImageContext.h"
35 
36 #ifndef SILLY_OPT_INLINE
37 #define inline
38 #include "loaders/SILLYJPGImageContext.icpp"
39 #undef inline
40 #endif
41 
42 #include <jpeglib.h>
43 
44 // Start section of namespace SILLY
45 namespace SILLY
46 {
47 
48 
49 void JPG_init_source(j_decompress_ptr cinfo)
50 {
51  // Nothing to do
52 }
53 
54 boolean JPG_fill_input_buffer(j_decompress_ptr cinfo)
55 {
56  JPGImageContext* jpg = reinterpret_cast<JPGImageContext*>(cinfo->client_data);
57  cinfo->src->next_input_byte = jpg->d_source->getDataPtr();
58  cinfo->src->bytes_in_buffer = jpg->d_source->getSize();
59  return TRUE;
60 }
61 
62 void JPG_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
63 {
64  if (num_bytes > 0)
65  {
66  cinfo->src->next_input_byte += (size_t)num_bytes;
67  cinfo->src->bytes_in_buffer -= (size_t)num_bytes;
68  }
69 }
70 
71 void JPG_term_source(j_decompress_ptr cinfo)
72 {
73  // Nothing to do
74 }
75 
76 void JPG_error_exit(j_common_ptr cinfo)
77 {
78  JPGImageContext* jpg = reinterpret_cast<JPGImageContext*>(cinfo->client_data);
79  // TODO
80  longjmp(jpg->setjmp_buffer, 1);
81 
82 }
83 
84 void JPG_emit_message(j_common_ptr cinfo, int msg_level)
85 {
86  // Ignore
87 }
88 
89 
90 JPGImageContext::JPGImageContext()
91  : ImageContext(0, 0)
92 {
93  src_mgr.bytes_in_buffer = 0;
94  src_mgr.next_input_byte = 0;
95  src_mgr.init_source = JPG_init_source;
96  src_mgr.fill_input_buffer = JPG_fill_input_buffer;
97  src_mgr.skip_input_data = JPG_skip_input_data;
98  src_mgr.resync_to_restart = jpeg_resync_to_restart;
99  src_mgr.term_source = JPG_term_source;
100  jpeg_create_decompress(&cinfo);
101  cinfo.src = &src_mgr;
102  cinfo.client_data = this;
103  cinfo.err = jpeg_std_error(&d_error_mgr);
104  d_error_mgr.error_exit = JPG_error_exit;
105 
106 }
107 
108 
109 JPGImageContext::~JPGImageContext()
110 {
111  jpeg_destroy_decompress(&cinfo);
112 }
113 
114 
115 void JPGImageContext::setImageSize()
116 {
117  setWidth(cinfo.output_width);
118  setHeight(cinfo.output_height);
119 }
120 
121 } // End section of namespace SILLY
virtual size_t getSize() const =0
Return the size of the data.
Store the data needed by an ImageLoader object during the parsing of an image.
Simple Image Loading LibrarY namespace.
Image Context for JPG image loader.
virtual const byte * getDataPtr() const =0
Get raw access to the image data.