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1 /* | 1 /* |
2 * jcapistd.c | 2 * jcapistd.c |
3 * | 3 * |
4 * Copyright (C) 1994-1996, Thomas G. Lane. | 4 * Copyright (C) 1994-1996, Thomas G. Lane. |
5 * This file is part of the Independent JPEG Group's software. | 5 * This file is part of the Independent JPEG Group's software. |
6 * For conditions of distribution and use, see the accompanying README file. | 6 * For conditions of distribution and use, see the accompanying README.ijg |
| 7 * file. |
7 * | 8 * |
8 * This file contains application interface code for the compression half | 9 * This file contains application interface code for the compression half |
9 * of the JPEG library. These are the "standard" API routines that are | 10 * 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 * 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 * transcoding-only application. Note that if an application links in |
12 * jpeg_start_compress, it will end up linking in the entire compressor. | 13 * 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 * We thus must separate this file from jcapimin.c to avoid linking the |
14 * whole compression library into a transcoder. | 15 * whole compression library into a transcoder. |
15 */ | 16 */ |
16 | 17 |
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34 * wrong thing. | 35 * wrong thing. |
35 */ | 36 */ |
36 | 37 |
37 GLOBAL(void) | 38 GLOBAL(void) |
38 jpeg_start_compress (j_compress_ptr cinfo, boolean write_all_tables) | 39 jpeg_start_compress (j_compress_ptr cinfo, boolean write_all_tables) |
39 { | 40 { |
40 if (cinfo->global_state != CSTATE_START) | 41 if (cinfo->global_state != CSTATE_START) |
41 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | 42 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
42 | 43 |
43 if (write_all_tables) | 44 if (write_all_tables) |
44 jpeg_suppress_tables(cinfo, FALSE);»/* mark all tables to be written */ | 45 jpeg_suppress_tables(cinfo, FALSE); /* mark all tables to be written */ |
45 | 46 |
46 /* (Re)initialize error mgr and destination modules */ | 47 /* (Re)initialize error mgr and destination modules */ |
47 (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo); | 48 (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo); |
48 (*cinfo->dest->init_destination) (cinfo); | 49 (*cinfo->dest->init_destination) (cinfo); |
49 /* Perform master selection of active modules */ | 50 /* Perform master selection of active modules */ |
50 jinit_compress_master(cinfo); | 51 jinit_compress_master(cinfo); |
51 /* Set up for the first pass */ | 52 /* Set up for the first pass */ |
52 (*cinfo->master->prepare_for_pass) (cinfo); | 53 (*cinfo->master->prepare_for_pass) (cinfo); |
53 /* Ready for application to drive first pass through jpeg_write_scanlines | 54 /* Ready for application to drive first pass through jpeg_write_scanlines |
54 * or jpeg_write_raw_data. | 55 * or jpeg_write_raw_data. |
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68 * | 69 * |
69 * Note: we warn about excess calls to jpeg_write_scanlines() since | 70 * Note: we warn about excess calls to jpeg_write_scanlines() since |
70 * this likely signals an application programmer error. However, | 71 * this likely signals an application programmer error. However, |
71 * excess scanlines passed in the last valid call are *silently* ignored, | 72 * excess scanlines passed in the last valid call are *silently* ignored, |
72 * so that the application need not adjust num_lines for end-of-image | 73 * so that the application need not adjust num_lines for end-of-image |
73 * when using a multiple-scanline buffer. | 74 * when using a multiple-scanline buffer. |
74 */ | 75 */ |
75 | 76 |
76 GLOBAL(JDIMENSION) | 77 GLOBAL(JDIMENSION) |
77 jpeg_write_scanlines (j_compress_ptr cinfo, JSAMPARRAY scanlines, | 78 jpeg_write_scanlines (j_compress_ptr cinfo, JSAMPARRAY scanlines, |
78 » » JDIMENSION num_lines) | 79 JDIMENSION num_lines) |
79 { | 80 { |
80 JDIMENSION row_ctr, rows_left; | 81 JDIMENSION row_ctr, rows_left; |
81 | 82 |
82 if (cinfo->global_state != CSTATE_SCANNING) | 83 if (cinfo->global_state != CSTATE_SCANNING) |
83 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | 84 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
84 if (cinfo->next_scanline >= cinfo->image_height) | 85 if (cinfo->next_scanline >= cinfo->image_height) |
85 WARNMS(cinfo, JWRN_TOO_MUCH_DATA); | 86 WARNMS(cinfo, JWRN_TOO_MUCH_DATA); |
86 | 87 |
87 /* Call progress monitor hook if present */ | 88 /* Call progress monitor hook if present */ |
88 if (cinfo->progress != NULL) { | 89 if (cinfo->progress != NULL) { |
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111 } | 112 } |
112 | 113 |
113 | 114 |
114 /* | 115 /* |
115 * Alternate entry point to write raw data. | 116 * Alternate entry point to write raw data. |
116 * Processes exactly one iMCU row per call, unless suspended. | 117 * Processes exactly one iMCU row per call, unless suspended. |
117 */ | 118 */ |
118 | 119 |
119 GLOBAL(JDIMENSION) | 120 GLOBAL(JDIMENSION) |
120 jpeg_write_raw_data (j_compress_ptr cinfo, JSAMPIMAGE data, | 121 jpeg_write_raw_data (j_compress_ptr cinfo, JSAMPIMAGE data, |
121 » » JDIMENSION num_lines) | 122 JDIMENSION num_lines) |
122 { | 123 { |
123 JDIMENSION lines_per_iMCU_row; | 124 JDIMENSION lines_per_iMCU_row; |
124 | 125 |
125 if (cinfo->global_state != CSTATE_RAW_OK) | 126 if (cinfo->global_state != CSTATE_RAW_OK) |
126 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | 127 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
127 if (cinfo->next_scanline >= cinfo->image_height) { | 128 if (cinfo->next_scanline >= cinfo->image_height) { |
128 WARNMS(cinfo, JWRN_TOO_MUCH_DATA); | 129 WARNMS(cinfo, JWRN_TOO_MUCH_DATA); |
129 return 0; | 130 return 0; |
130 } | 131 } |
131 | 132 |
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152 /* Directly compress the row. */ | 153 /* Directly compress the row. */ |
153 if (! (*cinfo->coef->compress_data) (cinfo, data)) { | 154 if (! (*cinfo->coef->compress_data) (cinfo, data)) { |
154 /* If compressor did not consume the whole row, suspend processing. */ | 155 /* If compressor did not consume the whole row, suspend processing. */ |
155 return 0; | 156 return 0; |
156 } | 157 } |
157 | 158 |
158 /* OK, we processed one iMCU row. */ | 159 /* OK, we processed one iMCU row. */ |
159 cinfo->next_scanline += lines_per_iMCU_row; | 160 cinfo->next_scanline += lines_per_iMCU_row; |
160 return lines_per_iMCU_row; | 161 return lines_per_iMCU_row; |
161 } | 162 } |
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