Line data Source code
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, 90 Allstate Parkway, Markham, Ontario, 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 0 : static boolean _DummyFillInputBuffer(j_decompress_ptr) { return 0; }
48 0 : static void _DummySkipInputData(j_decompress_ptr, long) {}
49 0 : static boolean _DummyEmptyOutputBuffer(j_compress_ptr) { return 0; }
50 :
51 : /************************************************************************/
52 : /* JpegError() */
53 : /* */
54 : /* Handle errors generated by the IJG library. We treat all */
55 : /* errors as fatal at this point. Future handling may be */
56 : /* improved by overriding other methods. */
57 : /************************************************************************/
58 :
59 0 : static void JpegError(j_common_ptr cinfo)
60 : {
61 : char buf[256];
62 :
63 0 : cinfo->err->format_message(cinfo, buf);
64 :
65 : // Make sure we destroy the context before throwing an exception.
66 0 : if (cinfo->is_decompressor)
67 0 : jpeg_destroy_decompress((j_decompress_ptr) cinfo);
68 : else
69 0 : jpeg_destroy_compress((j_compress_ptr) cinfo);
70 :
71 0 : return ThrowPCIDSKException( "%s", buf );
72 : }
73 :
74 : /************************************************************************/
75 : /* LibJPEG_DecompressBlock() */
76 : /************************************************************************/
77 :
78 1 : void PCIDSK::LibJPEG_DecompressBlock(
79 : uint8 *src_data, int src_bytes, uint8 *dst_data, CPL_UNUSED int dst_bytes,
80 : int xsize, int ysize, eChanType CPL_UNUSED pixel_type )
81 : {
82 : struct jpeg_decompress_struct sJCompInfo;
83 : struct jpeg_source_mgr sSrcMgr;
84 : struct jpeg_error_mgr sErrMgr;
85 :
86 : int i;
87 :
88 : /* -------------------------------------------------------------------- */
89 : /* Setup the buffer we will compress into. We make it pretty */
90 : /* big to ensure there is space. The calling function will */
91 : /* free it as soon as it is done so this should not hurt much. */
92 : /* -------------------------------------------------------------------- */
93 1 : sSrcMgr.init_source = _DummySrcMgrMethod;
94 1 : sSrcMgr.fill_input_buffer = _DummyFillInputBuffer;
95 1 : sSrcMgr.skip_input_data = _DummySkipInputData;
96 1 : sSrcMgr.resync_to_restart = jpeg_resync_to_restart;
97 1 : sSrcMgr.term_source = _DummySrcMgrMethod;
98 :
99 1 : sSrcMgr.next_input_byte = src_data;
100 1 : sSrcMgr.bytes_in_buffer = src_bytes;
101 :
102 : /* -------------------------------------------------------------------- */
103 : /* Setup JPEG Decompression */
104 : /* -------------------------------------------------------------------- */
105 1 : jpeg_create_decompress(&sJCompInfo);
106 :
107 1 : sJCompInfo.src = &sSrcMgr;
108 1 : sJCompInfo.err = jpeg_std_error(&sErrMgr);
109 1 : sJCompInfo.err->output_message = JpegError;
110 :
111 : /* -------------------------------------------------------------------- */
112 : /* Read the header. */
113 : /* -------------------------------------------------------------------- */
114 1 : jpeg_read_header( &sJCompInfo, TRUE );
115 1 : if (sJCompInfo.image_width != (unsigned int)xsize ||
116 1 : sJCompInfo.image_height != (unsigned int)ysize)
117 : {
118 0 : jpeg_destroy_decompress( &sJCompInfo );
119 :
120 0 : return ThrowPCIDSKException("Tile Size wrong in LibJPEG_DecompressTile(), got %dx%d, expected %dx%d.",
121 : sJCompInfo.image_width,
122 : sJCompInfo.image_height,
123 0 : xsize, ysize );
124 : }
125 :
126 1 : sJCompInfo.out_color_space = JCS_GRAYSCALE;
127 1 : jpeg_start_decompress(&sJCompInfo);
128 :
129 : /* -------------------------------------------------------------------- */
130 : /* Read each of the scanlines. */
131 : /* -------------------------------------------------------------------- */
132 257 : for( i = 0; i < ysize; i++ )
133 : {
134 256 : uint8 *line_data = dst_data + i*xsize;
135 256 : jpeg_read_scanlines( &sJCompInfo, (JSAMPARRAY) &line_data, 1 );
136 : }
137 :
138 : /* -------------------------------------------------------------------- */
139 : /* Cleanup. */
140 : /* -------------------------------------------------------------------- */
141 1 : jpeg_finish_decompress( &sJCompInfo );
142 1 : jpeg_destroy_decompress( &sJCompInfo );
143 : }
144 :
145 : /************************************************************************/
146 : /* LibJPEG_CompressBlock() */
147 : /************************************************************************/
148 :
149 1 : void PCIDSK::LibJPEG_CompressBlock(
150 : uint8 *src_data, CPL_UNUSED int src_bytes, uint8 *dst_data, int &dst_bytes,
151 : int xsize, int ysize, CPL_UNUSED eChanType pixel_type, int quality )
152 : {
153 : struct jpeg_compress_struct sJCompInfo;
154 : struct jpeg_destination_mgr sDstMgr;
155 : struct jpeg_error_mgr sErrMgr;
156 :
157 : int i;
158 :
159 : /* -------------------------------------------------------------------- */
160 : /* Setup the buffer we will compress into. */
161 : /* -------------------------------------------------------------------- */
162 1 : sDstMgr.next_output_byte = dst_data;
163 1 : sDstMgr.free_in_buffer = dst_bytes;
164 1 : sDstMgr.init_destination = _DummyMgrMethod;
165 1 : sDstMgr.empty_output_buffer = _DummyEmptyOutputBuffer;
166 1 : sDstMgr.term_destination = _DummyMgrMethod;
167 :
168 : /* -------------------------------------------------------------------- */
169 : /* Setup JPEG Compression */
170 : /* -------------------------------------------------------------------- */
171 1 : jpeg_create_compress(&sJCompInfo);
172 :
173 1 : sJCompInfo.dest = &sDstMgr;
174 1 : sJCompInfo.err = jpeg_std_error(&sErrMgr);
175 1 : sJCompInfo.err->output_message = JpegError;
176 :
177 1 : sJCompInfo.image_width = xsize;
178 1 : sJCompInfo.image_height = ysize;
179 1 : sJCompInfo.input_components = 1;
180 1 : sJCompInfo.in_color_space = JCS_GRAYSCALE;
181 :
182 1 : jpeg_set_defaults(&sJCompInfo);
183 1 : jpeg_set_quality(&sJCompInfo, quality, TRUE );
184 1 : jpeg_start_compress(&sJCompInfo, TRUE );
185 :
186 : /* -------------------------------------------------------------------- */
187 : /* Write all the scanlines at once. */
188 : /* -------------------------------------------------------------------- */
189 257 : for( i = 0; i < ysize; i++ )
190 : {
191 256 : uint8 *pabyLine = src_data + i*xsize;
192 :
193 256 : jpeg_write_scanlines( &sJCompInfo, (JSAMPARRAY)&pabyLine, 1 );
194 : }
195 :
196 : /* -------------------------------------------------------------------- */
197 : /* Cleanup. */
198 : /* -------------------------------------------------------------------- */
199 1 : jpeg_finish_compress( &sJCompInfo );
200 :
201 1 : dst_bytes = static_cast<int>(dst_bytes - sDstMgr.free_in_buffer);
202 :
203 1 : jpeg_destroy_compress( &sJCompInfo );
204 1 : }
205 :
206 : #endif /* defined(HAVE_LIBJPEG) */
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