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comparison mupdf-source/thirdparty/libjpeg/wrrle.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * wrrle.c
3 *
4 * Copyright (C) 1991-1996, Thomas G. Lane.
5 * Modified 2017-2019 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 routines to write output images in RLE format.
10 * The Utah Raster Toolkit library is required (version 3.1 or later).
11 *
12 * These routines may need modification for non-Unix environments or
13 * specialized applications. As they stand, they assume output to
14 * an ordinary stdio stream.
15 *
16 * Based on code contributed by Mike Lijewski,
17 * with updates from Robert Hutchinson.
18 */
19
20 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
21
22 #ifdef RLE_SUPPORTED
23
24 /* rle.h is provided by the Utah Raster Toolkit. */
25
26 #include <rle.h>
27
28 /*
29 * We assume that JSAMPLE has the same representation as rle_pixel,
30 * to wit, "unsigned char". Hence we can't cope with 12- or 16-bit samples.
31 */
32
33 #if BITS_IN_JSAMPLE != 8
34 Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
35 #endif
36
37
38 /*
39 * Since RLE stores scanlines bottom-to-top, we have to invert the image
40 * from JPEG's top-to-bottom order. To do this, we save the outgoing data
41 * in a virtual array during put_pixel_row calls, then actually emit the
42 * RLE file during finish_output.
43 */
44
45
46 /*
47 * For now, if we emit an RLE color map then it is always 256 entries long,
48 * though not all of the entries need be used.
49 */
50
51 #define CMAPBITS 8
52 #define CMAPLENGTH (1<<(CMAPBITS))
53
54 typedef struct {
55 struct djpeg_dest_struct pub; /* public fields */
56
57 jvirt_sarray_ptr image; /* virtual array to store the output image */
58 rle_map *colormap; /* RLE-style color map, or NULL if none */
59 rle_pixel **rle_row; /* To pass rows to rle_putrow() */
60
61 } rle_dest_struct;
62
63 typedef rle_dest_struct * rle_dest_ptr;
64
65
66 /* Forward declarations */
67 METHODDEF(void) rle_put_pixel_rows
68 JPP((j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
69 JDIMENSION rows_supplied));
70
71
72 /*
73 * Write the file header.
74 *
75 * In this module it's easier to wait till finish_output to write anything.
76 */
77
78 METHODDEF(void)
79 start_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
80 {
81 rle_dest_ptr dest = (rle_dest_ptr) dinfo;
82 size_t cmapsize;
83 int ci, i;
84 #ifdef PROGRESS_REPORT
85 cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
86 #endif
87
88 /*
89 * Make sure the image can be stored in RLE format.
90 *
91 * - RLE stores image dimensions as *signed* 16 bit integers. JPEG
92 * uses unsigned, so we have to check the width.
93 *
94 * - Colorspace is expected to be grayscale or RGB.
95 *
96 * - The number of channels (components) is expected to be 1 (grayscale/
97 * pseudocolor) or 3 (truecolor/directcolor).
98 * (could be 2 or 4 if using an alpha channel, but we aren't)
99 */
100
101 if (cinfo->output_width > 32767 || cinfo->output_height > 32767)
102 ERREXIT2(cinfo, JERR_RLE_DIMENSIONS, cinfo->output_width,
103 cinfo->output_height);
104
105 if (cinfo->out_color_space != JCS_GRAYSCALE &&
106 cinfo->out_color_space != JCS_RGB)
107 ERREXIT(cinfo, JERR_RLE_COLORSPACE);
108
109 if (cinfo->output_components != 1 && cinfo->output_components != 3)
110 ERREXIT1(cinfo, JERR_RLE_TOOMANYCHANNELS, cinfo->num_components);
111
112 /* Convert colormap, if any, to RLE format. */
113
114 dest->colormap = NULL;
115
116 if (cinfo->quantize_colors) {
117 /* Allocate storage for RLE-style cmap, zero any extra entries */
118 cmapsize = cinfo->out_color_components * CMAPLENGTH * SIZEOF(rle_map);
119 dest->colormap = (rle_map *) (*cinfo->mem->alloc_small)
120 ((j_common_ptr) cinfo, JPOOL_IMAGE, cmapsize);
121 MEMZERO(dest->colormap, cmapsize);
122
123 /* Save away data in RLE format --- note 8-bit left shift! */
124 /* Shifting would need adjustment for JSAMPLEs wider than 8 bits. */
125 for (ci = 0; ci < cinfo->out_color_components; ci++) {
126 for (i = 0; i < cinfo->actual_number_of_colors; i++) {
127 dest->colormap[ci * CMAPLENGTH + i] =
128 GETJSAMPLE(cinfo->colormap[ci][i]) << 8;
129 }
130 }
131 }
132
133 /* Set the output buffer to the first row */
134 dest->pub.buffer = (*cinfo->mem->access_virt_sarray)
135 ((j_common_ptr) cinfo, dest->image, (JDIMENSION) 0, (JDIMENSION) 1, TRUE);
136 dest->pub.buffer_height = 1;
137
138 dest->pub.put_pixel_rows = rle_put_pixel_rows;
139
140 #ifdef PROGRESS_REPORT
141 if (progress != NULL) {
142 progress->total_extra_passes++; /* count file writing as separate pass */
143 }
144 #endif
145 }
146
147
148 /*
149 * Write some pixel data.
150 *
151 * This routine just saves the data away in a virtual array.
152 */
153
154 METHODDEF(void)
155 rle_put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
156 JDIMENSION rows_supplied)
157 {
158 rle_dest_ptr dest = (rle_dest_ptr) dinfo;
159
160 if (cinfo->output_scanline < cinfo->output_height) {
161 dest->pub.buffer = (*cinfo->mem->access_virt_sarray)
162 ((j_common_ptr) cinfo, dest->image,
163 cinfo->output_scanline, (JDIMENSION) 1, TRUE);
164 }
165 }
166
167
168 /*
169 * Finish up at the end of the file.
170 *
171 * Here is where we really output the RLE file.
172 */
173
174 METHODDEF(void)
175 finish_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
176 {
177 rle_dest_ptr dest = (rle_dest_ptr) dinfo;
178 rle_hdr header; /* Output file information */
179 rle_pixel **rle_row, *red_ptr, *green_ptr, *blue_ptr;
180 JSAMPROW output_row;
181 char cmapcomment[80];
182 int row, col;
183 int ci;
184 #ifdef PROGRESS_REPORT
185 cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
186 #endif
187
188 /* Initialize the header info */
189 header = *rle_hdr_init(NULL);
190 header.rle_file = dest->pub.output_file;
191 header.xmin = 0;
192 header.xmax = cinfo->output_width - 1;
193 header.ymin = 0;
194 header.ymax = cinfo->output_height - 1;
195 header.alpha = 0;
196 header.ncolors = cinfo->output_components;
197 for (ci = 0; ci < cinfo->output_components; ci++) {
198 RLE_SET_BIT(header, ci);
199 }
200 if (cinfo->quantize_colors) {
201 header.ncmap = cinfo->out_color_components;
202 header.cmaplen = CMAPBITS;
203 header.cmap = dest->colormap;
204 /* Add a comment to the output image with the true colormap length. */
205 sprintf(cmapcomment, "color_map_length=%d", cinfo->actual_number_of_colors);
206 rle_putcom(cmapcomment, &header);
207 }
208
209 /* Emit the RLE header and color map (if any) */
210 rle_put_setup(&header);
211
212 /* Now output the RLE data from our virtual array.
213 * We assume here that (a) rle_pixel is represented the same as JSAMPLE,
214 * and (b) we are not on a machine where FAR pointers differ from regular.
215 */
216
217 #ifdef PROGRESS_REPORT
218 if (progress != NULL) {
219 progress->pub.pass_limit = cinfo->output_height;
220 progress->pub.pass_counter = 0;
221 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
222 }
223 #endif
224
225 if (cinfo->output_components == 1) {
226 for (row = cinfo->output_height - 1; row >= 0; row--) {
227 rle_row = (rle_pixel **) (*cinfo->mem->access_virt_sarray)
228 ((j_common_ptr) cinfo, dest->image,
229 (JDIMENSION) row, (JDIMENSION) 1, FALSE);
230 rle_putrow(rle_row, (int) cinfo->output_width, &header);
231 #ifdef PROGRESS_REPORT
232 if (progress != NULL) {
233 progress->pub.pass_counter++;
234 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
235 }
236 #endif
237 }
238 } else {
239 for (row = cinfo->output_height - 1; row >= 0; row--) {
240 output_row = * (*cinfo->mem->access_virt_sarray)
241 ((j_common_ptr) cinfo, dest->image,
242 (JDIMENSION) row, (JDIMENSION) 1, FALSE);
243 rle_row = dest->rle_row;
244 red_ptr = rle_row[0];
245 green_ptr = rle_row[1];
246 blue_ptr = rle_row[2];
247 for (col = cinfo->output_width; col > 0; col--) {
248 *red_ptr++ = GETJSAMPLE(*output_row++);
249 *green_ptr++ = GETJSAMPLE(*output_row++);
250 *blue_ptr++ = GETJSAMPLE(*output_row++);
251 }
252 rle_putrow(rle_row, (int) cinfo->output_width, &header);
253 #ifdef PROGRESS_REPORT
254 if (progress != NULL) {
255 progress->pub.pass_counter++;
256 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
257 }
258 #endif
259 }
260 }
261
262 #ifdef PROGRESS_REPORT
263 if (progress != NULL)
264 progress->completed_extra_passes++;
265 #endif
266
267 /* Emit file trailer */
268 rle_puteof(&header);
269 JFFLUSH(dest->pub.output_file);
270 if (JFERROR(dest->pub.output_file))
271 ERREXIT(cinfo, JERR_FILE_WRITE);
272 }
273
274
275 /*
276 * The module selection routine for RLE format output.
277 */
278
279 GLOBAL(djpeg_dest_ptr)
280 jinit_write_rle (j_decompress_ptr cinfo)
281 {
282 rle_dest_ptr dest;
283
284 /* Create module interface object, fill in method pointers */
285 dest = (rle_dest_ptr) (*cinfo->mem->alloc_small)
286 ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(rle_dest_struct));
287 dest->pub.start_output = start_output_rle;
288 dest->pub.finish_output = finish_output_rle;
289
290 /* Calculate output image dimensions so we can allocate space */
291 jpeg_calc_output_dimensions(cinfo);
292
293 /* Allocate a work array for output to the RLE library. */
294 dest->rle_row = (*cinfo->mem->alloc_sarray) ((j_common_ptr) cinfo,
295 JPOOL_IMAGE, cinfo->output_width, (JDIMENSION) cinfo->output_components);
296
297 /* Allocate a virtual array to hold the image. */
298 dest->image = (*cinfo->mem->request_virt_sarray)
299 ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
300 cinfo->output_width * (JDIMENSION) cinfo->output_components,
301 cinfo->output_height, (JDIMENSION) 1);
302
303 return &dest->pub;
304 }
305
306 #endif /* RLE_SUPPORTED */