1 : /******************************************************************************
2 : *
3 : * Purpose: Implementation of the JPEG compression/decompression based
4 : * on libjpeg. This implements functions suitable for use
5 : * as jpeg interfaces in the PCIDSKInterfaces class.
6 : *
7 : ******************************************************************************
8 : * Copyright (c) 2009
9 : * PCI Geomatics, 50 West Wilmot Street, Richmond Hill, Ont, Canada
10 : *
11 : * Permission is hereby granted, free of charge, to any person obtaining a
12 : * copy of this software and associated documentation files (the "Software"),
13 : * to deal in the Software without restriction, including without limitation
14 : * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 : * and/or sell copies of the Software, and to permit persons to whom the
16 : * Software is furnished to do so, subject to the following conditions:
17 : *
18 : * The above copyright notice and this permission notice shall be included
19 : * in all copies or substantial portions of the Software.
20 : *
21 : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22 : * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 : * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 : * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 : * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 : * DEALINGS IN THE SOFTWARE.
28 : ****************************************************************************/
29 :
30 : #include "pcidsk_config.h"
31 : #include "pcidsk_types.h"
32 : #include "core/pcidsk_utils.h"
33 : #include "pcidsk_exception.h"
34 : #include <cassert>
35 : #include <cstdio>
36 :
37 : using namespace PCIDSK;
38 :
39 : #if defined(HAVE_LIBJPEG)
40 :
41 : extern "C" {
42 : #include "jpeglib.h"
43 : }
44 :
45 2 : static void _DummyMgrMethod( j_compress_ptr /*pUnused*/ ) {}
46 2 : static void _DummySrcMgrMethod( j_decompress_ptr /*pUnused*/ ) {}
47 :
48 : /************************************************************************/
49 : /* JpegError() */
50 : /* */
51 : /* Handle errors generated by the IJG library. We treat all */
52 : /* errors as fatal at this point. Future handling may be */
53 : /* improved by overriding other methods. */
54 : /************************************************************************/
55 :
56 0 : static void JpegError(j_common_ptr cinfo)
57 : {
58 : char buf[256];
59 :
60 0 : cinfo->err->format_message(cinfo, buf);
61 0 : ThrowPCIDSKException( "%s", buf );
62 0 : }
63 :
64 : /************************************************************************/
65 : /* LibJPEG_DecompressBlock() */
66 : /************************************************************************/
67 :
68 1 : void PCIDSK::LibJPEG_DecompressBlock(
69 : uint8 *src_data, int src_bytes, uint8 *dst_data, int dst_bytes,
70 : int xsize, int ysize, eChanType pixel_type )
71 :
72 : {
73 : struct jpeg_decompress_struct sJCompInfo;
74 : struct jpeg_source_mgr sSrcMgr;
75 : struct jpeg_error_mgr sErrMgr;
76 :
77 : int i;
78 :
79 : /* -------------------------------------------------------------------- */
80 : /* Setup the buffer we will compress into. We make it pretty */
81 : /* big to ensure there is space. The calling function will */
82 : /* free it as soon as it is done so this shouldn't hurt much. */
83 : /* -------------------------------------------------------------------- */
84 1 : sSrcMgr.init_source = _DummySrcMgrMethod;
85 : sSrcMgr.fill_input_buffer = (boolean (*)(j_decompress_ptr))
86 1 : _DummyMgrMethod;
87 : sSrcMgr.skip_input_data = (void (*)(j_decompress_ptr, long))
88 1 : _DummyMgrMethod;
89 1 : sSrcMgr.resync_to_restart = jpeg_resync_to_restart;
90 1 : sSrcMgr.term_source = _DummySrcMgrMethod;
91 :
92 1 : sSrcMgr.next_input_byte = src_data;
93 1 : sSrcMgr.bytes_in_buffer = src_bytes;
94 :
95 : /* -------------------------------------------------------------------- */
96 : /* Setup JPEG Decompression */
97 : /* -------------------------------------------------------------------- */
98 1 : jpeg_create_decompress(&sJCompInfo);
99 :
100 1 : sJCompInfo.src = &sSrcMgr;
101 1 : sJCompInfo.err = jpeg_std_error(&sErrMgr);
102 1 : sJCompInfo.err->output_message = JpegError;
103 :
104 : /* -------------------------------------------------------------------- */
105 : /* Read the header. */
106 : /* -------------------------------------------------------------------- */
107 1 : jpeg_read_header( &sJCompInfo, TRUE );
108 1 : if (sJCompInfo.image_width != (unsigned int)xsize ||
109 : sJCompInfo.image_height != (unsigned int)ysize)
110 : {
111 : ThrowPCIDSKException("Tile Size wrong in LibJPEG_DecompressTile(), got %dx%d, expected %dx%d.",
112 : sJCompInfo.image_width,
113 : sJCompInfo.image_height,
114 0 : xsize, ysize );
115 : }
116 :
117 1 : sJCompInfo.out_color_space = JCS_GRAYSCALE;
118 :
119 1 : jpeg_start_decompress(&sJCompInfo);
120 :
121 : /* -------------------------------------------------------------------- */
122 : /* Read each of the scanlines. */
123 : /* -------------------------------------------------------------------- */
124 128 : for( i = 0; i < ysize; i++ )
125 : {
126 127 : uint8 *line_data = dst_data + i*xsize;
127 :
128 127 : jpeg_read_scanlines( &sJCompInfo, (JSAMPARRAY) &line_data, 1 );
129 : }
130 :
131 : /* -------------------------------------------------------------------- */
132 : /* Cleanup. */
133 : /* -------------------------------------------------------------------- */
134 1 : jpeg_finish_decompress( &sJCompInfo );
135 1 : jpeg_destroy_decompress( &sJCompInfo );
136 1 : }
137 :
138 : /************************************************************************/
139 : /* LibJPEG_CompressBlock() */
140 : /************************************************************************/
141 :
142 1 : void PCIDSK::LibJPEG_CompressBlock(
143 : uint8 *src_data, int src_bytes, uint8 *dst_data, int &dst_bytes,
144 : int xsize, int ysize, eChanType pixel_type, int quality )
145 :
146 : {
147 : struct jpeg_compress_struct sJCompInfo;
148 : struct jpeg_destination_mgr sDstMgr;
149 : struct jpeg_error_mgr sErrMgr;
150 :
151 : int i;
152 :
153 : /* -------------------------------------------------------------------- */
154 : /* Setup the buffer we will compress into. */
155 : /* -------------------------------------------------------------------- */
156 1 : sDstMgr.next_output_byte = dst_data;
157 1 : sDstMgr.free_in_buffer = dst_bytes;
158 1 : sDstMgr.init_destination = _DummyMgrMethod;
159 : sDstMgr.empty_output_buffer = (boolean (*)(j_compress_ptr))
160 1 : _DummyMgrMethod;
161 1 : sDstMgr.term_destination = _DummyMgrMethod;
162 :
163 : /* -------------------------------------------------------------------- */
164 : /* Setup JPEG Compression */
165 : /* -------------------------------------------------------------------- */
166 1 : jpeg_create_compress(&sJCompInfo);
167 :
168 1 : sJCompInfo.dest = &sDstMgr;
169 1 : sJCompInfo.err = jpeg_std_error(&sErrMgr);
170 1 : sJCompInfo.err->output_message = JpegError;
171 :
172 1 : sJCompInfo.image_width = xsize;
173 1 : sJCompInfo.image_height = ysize;
174 1 : sJCompInfo.input_components = 1;
175 1 : sJCompInfo.in_color_space = JCS_GRAYSCALE;
176 :
177 1 : jpeg_set_defaults(&sJCompInfo);
178 1 : jpeg_set_quality(&sJCompInfo, quality, TRUE );
179 1 : jpeg_start_compress(&sJCompInfo, TRUE );
180 :
181 : /* -------------------------------------------------------------------- */
182 : /* Write all the scanlines at once. */
183 : /* -------------------------------------------------------------------- */
184 128 : for( i = 0; i < ysize; i++ )
185 : {
186 127 : uint8 *pabyLine = src_data + i*xsize;
187 :
188 127 : jpeg_write_scanlines( &sJCompInfo, (JSAMPARRAY)&pabyLine, 1 );
189 : }
190 :
191 : /* -------------------------------------------------------------------- */
192 : /* Cleanup. */
193 : /* -------------------------------------------------------------------- */
194 1 : jpeg_finish_compress( &sJCompInfo );
195 :
196 1 : dst_bytes = dst_bytes - sDstMgr.free_in_buffer;
197 :
198 1 : jpeg_destroy_compress( &sJCompInfo );
199 1 : }
200 :
201 : #endif /* defined(HAVE_LIBJPEG) */
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