1 /*
2 * jcapistd.c
3 *
4 * Copyright (C) 1994-1996, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file contains application interface code for the compression half
9 * of the JPEG library. These are the "standard" API routines that are
10 * used in the normal full-compression case. They are not used by a
11 * transcoding-only application. Note that if an application links in
12 * jpeg_start_compress, it will end up linking in the entire compressor.
13 * We thus must separate this file from jcapimin.c to avoid linking the
14 * whole compression library into a transcoder.
15 */
16
17 #define JPEG_INTERNALS
18 #include "jinclude.h"
19 #include "jpeglib.h"
20
21
22 /*
23 * Compression initialization.
24 * Before calling this, all parameters and a data destination must be set up.
128 WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
129 return 0;
130 }
131
132 /* Call progress monitor hook if present */
133 if (cinfo->progress != NULL) {
134 cinfo->progress->pass_counter = (long) cinfo->next_scanline;
135 cinfo->progress->pass_limit = (long) cinfo->image_height;
136 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
137 }
138
139 /* Give master control module another chance if this is first call to
140 * jpeg_write_raw_data. This lets output of the frame/scan headers be
141 * delayed so that application can write COM, etc, markers between
142 * jpeg_start_compress and jpeg_write_raw_data.
143 */
144 if (cinfo->master->call_pass_startup)
145 (*cinfo->master->pass_startup) (cinfo);
146
147 /* Verify that at least one iMCU row has been passed. */
148 lines_per_iMCU_row = cinfo->max_v_samp_factor * DCTSIZE;
149 if (num_lines < lines_per_iMCU_row)
150 ERREXIT(cinfo, JERR_BUFFER_SIZE);
151
152 /* Directly compress the row. */
153 if (! (*cinfo->coef->compress_data) (cinfo, data)) {
154 /* If compressor did not consume the whole row, suspend processing. */
155 return 0;
156 }
157
158 /* OK, we processed one iMCU row. */
159 cinfo->next_scanline += lines_per_iMCU_row;
160 return lines_per_iMCU_row;
161 }
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1 /*
2 * jcapistd.c
3 *
4 * Copyright (C) 1994-1996, Thomas G. Lane.
5 * Modified 2013 by Guido Vollbeding.
6 * This file is part of the Independent JPEG Group's software.
7 * For conditions of distribution and use, see the accompanying README file.
8 *
9 * This file contains application interface code for the compression half
10 * of the JPEG library. These are the "standard" API routines that are
11 * used in the normal full-compression case. They are not used by a
12 * transcoding-only application. Note that if an application links in
13 * jpeg_start_compress, it will end up linking in the entire compressor.
14 * We thus must separate this file from jcapimin.c to avoid linking the
15 * whole compression library into a transcoder.
16 */
17
18 #define JPEG_INTERNALS
19 #include "jinclude.h"
20 #include "jpeglib.h"
21
22
23 /*
24 * Compression initialization.
25 * Before calling this, all parameters and a data destination must be set up.
129 WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
130 return 0;
131 }
132
133 /* Call progress monitor hook if present */
134 if (cinfo->progress != NULL) {
135 cinfo->progress->pass_counter = (long) cinfo->next_scanline;
136 cinfo->progress->pass_limit = (long) cinfo->image_height;
137 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
138 }
139
140 /* Give master control module another chance if this is first call to
141 * jpeg_write_raw_data. This lets output of the frame/scan headers be
142 * delayed so that application can write COM, etc, markers between
143 * jpeg_start_compress and jpeg_write_raw_data.
144 */
145 if (cinfo->master->call_pass_startup)
146 (*cinfo->master->pass_startup) (cinfo);
147
148 /* Verify that at least one iMCU row has been passed. */
149 lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->min_DCT_v_scaled_size;
150 if (num_lines < lines_per_iMCU_row)
151 ERREXIT(cinfo, JERR_BUFFER_SIZE);
152
153 /* Directly compress the row. */
154 if (! (*cinfo->coef->compress_data) (cinfo, data)) {
155 /* If compressor did not consume the whole row, suspend processing. */
156 return 0;
157 }
158
159 /* OK, we processed one iMCU row. */
160 cinfo->next_scanline += lines_per_iMCU_row;
161 return lines_per_iMCU_row;
162 }
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