Line data Source code
1 : /*
2 : * jcparam.c
3 : *
4 : * This file was part of the Independent JPEG Group's software:
5 : * Copyright (C) 1991-1998, Thomas G. Lane.
6 : * Modified 2003-2008 by Guido Vollbeding.
7 : * libjpeg-turbo Modifications:
8 : * Copyright (C) 2009-2011, D. R. Commander.
9 : * For conditions of distribution and use, see the accompanying README.ijg
10 : * file.
11 : *
12 : * This file contains optional default-setting code for the JPEG compressor.
13 : * Applications do not have to use this file, but those that don't use it
14 : * must know a lot more about the innards of the JPEG code.
15 : */
16 :
17 : #define JPEG_INTERNALS
18 : #include "jinclude.h"
19 : #include "jpeglib.h"
20 : #include "jstdhuff.c"
21 :
22 :
23 : /*
24 : * Quantization table setup routines
25 : */
26 :
27 : GLOBAL(void)
28 0 : jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
29 : const unsigned int *basic_table,
30 : int scale_factor, boolean force_baseline)
31 : /* Define a quantization table equal to the basic_table times
32 : * a scale factor (given as a percentage).
33 : * If force_baseline is TRUE, the computed quantization table entries
34 : * are limited to 1..255 for JPEG baseline compatibility.
35 : */
36 : {
37 : JQUANT_TBL **qtblptr;
38 : int i;
39 : long temp;
40 :
41 : /* Safety check to ensure start_compress not called yet. */
42 0 : if (cinfo->global_state != CSTATE_START)
43 0 : ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
44 :
45 0 : if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)
46 0 : ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);
47 :
48 0 : qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];
49 :
50 0 : if (*qtblptr == NULL)
51 0 : *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);
52 :
53 0 : for (i = 0; i < DCTSIZE2; i++) {
54 0 : temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;
55 : /* limit the values to the valid range */
56 0 : if (temp <= 0L) temp = 1L;
57 0 : if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */
58 0 : if (force_baseline && temp > 255L)
59 0 : temp = 255L; /* limit to baseline range if requested */
60 0 : (*qtblptr)->quantval[i] = (UINT16) temp;
61 : }
62 :
63 : /* Initialize sent_table FALSE so table will be written to JPEG file. */
64 0 : (*qtblptr)->sent_table = FALSE;
65 0 : }
66 :
67 :
68 : /* These are the sample quantization tables given in JPEG spec section K.1.
69 : * The spec says that the values given produce "good" quality, and
70 : * when divided by 2, "very good" quality.
71 : */
72 : static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
73 : 16, 11, 10, 16, 24, 40, 51, 61,
74 : 12, 12, 14, 19, 26, 58, 60, 55,
75 : 14, 13, 16, 24, 40, 57, 69, 56,
76 : 14, 17, 22, 29, 51, 87, 80, 62,
77 : 18, 22, 37, 56, 68, 109, 103, 77,
78 : 24, 35, 55, 64, 81, 104, 113, 92,
79 : 49, 64, 78, 87, 103, 121, 120, 101,
80 : 72, 92, 95, 98, 112, 100, 103, 99
81 : };
82 : static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
83 : 17, 18, 24, 47, 99, 99, 99, 99,
84 : 18, 21, 26, 66, 99, 99, 99, 99,
85 : 24, 26, 56, 99, 99, 99, 99, 99,
86 : 47, 66, 99, 99, 99, 99, 99, 99,
87 : 99, 99, 99, 99, 99, 99, 99, 99,
88 : 99, 99, 99, 99, 99, 99, 99, 99,
89 : 99, 99, 99, 99, 99, 99, 99, 99,
90 : 99, 99, 99, 99, 99, 99, 99, 99
91 : };
92 :
93 :
94 : #if JPEG_LIB_VERSION >= 70
95 : GLOBAL(void)
96 : jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
97 : /* Set or change the 'quality' (quantization) setting, using default tables
98 : * and straight percentage-scaling quality scales.
99 : * This entry point allows different scalings for luminance and chrominance.
100 : */
101 : {
102 : /* Set up two quantization tables using the specified scaling */
103 : jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
104 : cinfo->q_scale_factor[0], force_baseline);
105 : jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
106 : cinfo->q_scale_factor[1], force_baseline);
107 : }
108 : #endif
109 :
110 :
111 : GLOBAL(void)
112 0 : jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
113 : boolean force_baseline)
114 : /* Set or change the 'quality' (quantization) setting, using default tables
115 : * and a straight percentage-scaling quality scale. In most cases it's better
116 : * to use jpeg_set_quality (below); this entry point is provided for
117 : * applications that insist on a linear percentage scaling.
118 : */
119 : {
120 : /* Set up two quantization tables using the specified scaling */
121 0 : jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
122 : scale_factor, force_baseline);
123 0 : jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
124 : scale_factor, force_baseline);
125 0 : }
126 :
127 :
128 : GLOBAL(int)
129 0 : jpeg_quality_scaling (int quality)
130 : /* Convert a user-specified quality rating to a percentage scaling factor
131 : * for an underlying quantization table, using our recommended scaling curve.
132 : * The input 'quality' factor should be 0 (terrible) to 100 (very good).
133 : */
134 : {
135 : /* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */
136 0 : if (quality <= 0) quality = 1;
137 0 : if (quality > 100) quality = 100;
138 :
139 : /* The basic table is used as-is (scaling 100) for a quality of 50.
140 : * Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
141 : * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
142 : * to make all the table entries 1 (hence, minimum quantization loss).
143 : * Qualities 1..50 are converted to scaling percentage 5000/Q.
144 : */
145 0 : if (quality < 50)
146 0 : quality = 5000 / quality;
147 : else
148 0 : quality = 200 - quality*2;
149 :
150 0 : return quality;
151 : }
152 :
153 :
154 : GLOBAL(void)
155 0 : jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
156 : /* Set or change the 'quality' (quantization) setting, using default tables.
157 : * This is the standard quality-adjusting entry point for typical user
158 : * interfaces; only those who want detailed control over quantization tables
159 : * would use the preceding three routines directly.
160 : */
161 : {
162 : /* Convert user 0-100 rating to percentage scaling */
163 0 : quality = jpeg_quality_scaling(quality);
164 :
165 : /* Set up standard quality tables */
166 0 : jpeg_set_linear_quality(cinfo, quality, force_baseline);
167 0 : }
168 :
169 :
170 : /*
171 : * Default parameter setup for compression.
172 : *
173 : * Applications that don't choose to use this routine must do their
174 : * own setup of all these parameters. Alternately, you can call this
175 : * to establish defaults and then alter parameters selectively. This
176 : * is the recommended approach since, if we add any new parameters,
177 : * your code will still work (they'll be set to reasonable defaults).
178 : */
179 :
180 : GLOBAL(void)
181 0 : jpeg_set_defaults (j_compress_ptr cinfo)
182 : {
183 : int i;
184 :
185 : /* Safety check to ensure start_compress not called yet. */
186 0 : if (cinfo->global_state != CSTATE_START)
187 0 : ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
188 :
189 : /* Allocate comp_info array large enough for maximum component count.
190 : * Array is made permanent in case application wants to compress
191 : * multiple images at same param settings.
192 : */
193 0 : if (cinfo->comp_info == NULL)
194 0 : cinfo->comp_info = (jpeg_component_info *)
195 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
196 : MAX_COMPONENTS * sizeof(jpeg_component_info));
197 :
198 : /* Initialize everything not dependent on the color space */
199 :
200 : #if JPEG_LIB_VERSION >= 70
201 : cinfo->scale_num = 1; /* 1:1 scaling */
202 : cinfo->scale_denom = 1;
203 : #endif
204 0 : cinfo->data_precision = BITS_IN_JSAMPLE;
205 : /* Set up two quantization tables using default quality of 75 */
206 0 : jpeg_set_quality(cinfo, 75, TRUE);
207 : /* Set up two Huffman tables */
208 0 : std_huff_tables((j_common_ptr) cinfo);
209 :
210 : /* Initialize default arithmetic coding conditioning */
211 0 : for (i = 0; i < NUM_ARITH_TBLS; i++) {
212 0 : cinfo->arith_dc_L[i] = 0;
213 0 : cinfo->arith_dc_U[i] = 1;
214 0 : cinfo->arith_ac_K[i] = 5;
215 : }
216 :
217 : /* Default is no multiple-scan output */
218 0 : cinfo->scan_info = NULL;
219 0 : cinfo->num_scans = 0;
220 :
221 : /* Expect normal source image, not raw downsampled data */
222 0 : cinfo->raw_data_in = FALSE;
223 :
224 : /* Use Huffman coding, not arithmetic coding, by default */
225 0 : cinfo->arith_code = FALSE;
226 :
227 : /* By default, don't do extra passes to optimize entropy coding */
228 0 : cinfo->optimize_coding = FALSE;
229 : /* The standard Huffman tables are only valid for 8-bit data precision.
230 : * If the precision is higher, force optimization on so that usable
231 : * tables will be computed. This test can be removed if default tables
232 : * are supplied that are valid for the desired precision.
233 : */
234 0 : if (cinfo->data_precision > 8)
235 0 : cinfo->optimize_coding = TRUE;
236 :
237 : /* By default, use the simpler non-cosited sampling alignment */
238 0 : cinfo->CCIR601_sampling = FALSE;
239 :
240 : #if JPEG_LIB_VERSION >= 70
241 : /* By default, apply fancy downsampling */
242 : cinfo->do_fancy_downsampling = TRUE;
243 : #endif
244 :
245 : /* No input smoothing */
246 0 : cinfo->smoothing_factor = 0;
247 :
248 : /* DCT algorithm preference */
249 0 : cinfo->dct_method = JDCT_DEFAULT;
250 :
251 : /* No restart markers */
252 0 : cinfo->restart_interval = 0;
253 0 : cinfo->restart_in_rows = 0;
254 :
255 : /* Fill in default JFIF marker parameters. Note that whether the marker
256 : * will actually be written is determined by jpeg_set_colorspace.
257 : *
258 : * By default, the library emits JFIF version code 1.01.
259 : * An application that wants to emit JFIF 1.02 extension markers should set
260 : * JFIF_minor_version to 2. We could probably get away with just defaulting
261 : * to 1.02, but there may still be some decoders in use that will complain
262 : * about that; saying 1.01 should minimize compatibility problems.
263 : */
264 0 : cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */
265 0 : cinfo->JFIF_minor_version = 1;
266 0 : cinfo->density_unit = 0; /* Pixel size is unknown by default */
267 0 : cinfo->X_density = 1; /* Pixel aspect ratio is square by default */
268 0 : cinfo->Y_density = 1;
269 :
270 : /* Choose JPEG colorspace based on input space, set defaults accordingly */
271 :
272 0 : jpeg_default_colorspace(cinfo);
273 0 : }
274 :
275 :
276 : /*
277 : * Select an appropriate JPEG colorspace for in_color_space.
278 : */
279 :
280 : GLOBAL(void)
281 0 : jpeg_default_colorspace (j_compress_ptr cinfo)
282 : {
283 0 : switch (cinfo->in_color_space) {
284 : case JCS_GRAYSCALE:
285 0 : jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
286 0 : break;
287 : case JCS_RGB:
288 : case JCS_EXT_RGB:
289 : case JCS_EXT_RGBX:
290 : case JCS_EXT_BGR:
291 : case JCS_EXT_BGRX:
292 : case JCS_EXT_XBGR:
293 : case JCS_EXT_XRGB:
294 : case JCS_EXT_RGBA:
295 : case JCS_EXT_BGRA:
296 : case JCS_EXT_ABGR:
297 : case JCS_EXT_ARGB:
298 0 : jpeg_set_colorspace(cinfo, JCS_YCbCr);
299 0 : break;
300 : case JCS_YCbCr:
301 0 : jpeg_set_colorspace(cinfo, JCS_YCbCr);
302 0 : break;
303 : case JCS_CMYK:
304 0 : jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */
305 0 : break;
306 : case JCS_YCCK:
307 0 : jpeg_set_colorspace(cinfo, JCS_YCCK);
308 0 : break;
309 : case JCS_UNKNOWN:
310 0 : jpeg_set_colorspace(cinfo, JCS_UNKNOWN);
311 0 : break;
312 : default:
313 0 : ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
314 : }
315 0 : }
316 :
317 :
318 : /*
319 : * Set the JPEG colorspace, and choose colorspace-dependent default values.
320 : */
321 :
322 : GLOBAL(void)
323 0 : jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
324 : {
325 : jpeg_component_info *compptr;
326 : int ci;
327 :
328 : #define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \
329 : (compptr = &cinfo->comp_info[index], \
330 : compptr->component_id = (id), \
331 : compptr->h_samp_factor = (hsamp), \
332 : compptr->v_samp_factor = (vsamp), \
333 : compptr->quant_tbl_no = (quant), \
334 : compptr->dc_tbl_no = (dctbl), \
335 : compptr->ac_tbl_no = (actbl) )
336 :
337 : /* Safety check to ensure start_compress not called yet. */
338 0 : if (cinfo->global_state != CSTATE_START)
339 0 : ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
340 :
341 : /* For all colorspaces, we use Q and Huff tables 0 for luminance components,
342 : * tables 1 for chrominance components.
343 : */
344 :
345 0 : cinfo->jpeg_color_space = colorspace;
346 :
347 0 : cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */
348 0 : cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */
349 :
350 0 : switch (colorspace) {
351 : case JCS_GRAYSCALE:
352 0 : cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
353 0 : cinfo->num_components = 1;
354 : /* JFIF specifies component ID 1 */
355 0 : SET_COMP(0, 1, 1,1, 0, 0,0);
356 0 : break;
357 : case JCS_RGB:
358 0 : cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */
359 0 : cinfo->num_components = 3;
360 0 : SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);
361 0 : SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);
362 0 : SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);
363 0 : break;
364 : case JCS_YCbCr:
365 0 : cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
366 0 : cinfo->num_components = 3;
367 : /* JFIF specifies component IDs 1,2,3 */
368 : /* We default to 2x2 subsamples of chrominance */
369 0 : SET_COMP(0, 1, 2,2, 0, 0,0);
370 0 : SET_COMP(1, 2, 1,1, 1, 1,1);
371 0 : SET_COMP(2, 3, 1,1, 1, 1,1);
372 0 : break;
373 : case JCS_CMYK:
374 0 : cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */
375 0 : cinfo->num_components = 4;
376 0 : SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);
377 0 : SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);
378 0 : SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);
379 0 : SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);
380 0 : break;
381 : case JCS_YCCK:
382 0 : cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */
383 0 : cinfo->num_components = 4;
384 0 : SET_COMP(0, 1, 2,2, 0, 0,0);
385 0 : SET_COMP(1, 2, 1,1, 1, 1,1);
386 0 : SET_COMP(2, 3, 1,1, 1, 1,1);
387 0 : SET_COMP(3, 4, 2,2, 0, 0,0);
388 0 : break;
389 : case JCS_UNKNOWN:
390 0 : cinfo->num_components = cinfo->input_components;
391 0 : if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)
392 0 : ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
393 : MAX_COMPONENTS);
394 0 : for (ci = 0; ci < cinfo->num_components; ci++) {
395 0 : SET_COMP(ci, ci, 1,1, 0, 0,0);
396 : }
397 0 : break;
398 : default:
399 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
400 : }
401 0 : }
402 :
403 :
404 : #ifdef C_PROGRESSIVE_SUPPORTED
405 :
406 : LOCAL(jpeg_scan_info *)
407 0 : fill_a_scan (jpeg_scan_info *scanptr, int ci,
408 : int Ss, int Se, int Ah, int Al)
409 : /* Support routine: generate one scan for specified component */
410 : {
411 0 : scanptr->comps_in_scan = 1;
412 0 : scanptr->component_index[0] = ci;
413 0 : scanptr->Ss = Ss;
414 0 : scanptr->Se = Se;
415 0 : scanptr->Ah = Ah;
416 0 : scanptr->Al = Al;
417 0 : scanptr++;
418 0 : return scanptr;
419 : }
420 :
421 : LOCAL(jpeg_scan_info *)
422 0 : fill_scans (jpeg_scan_info *scanptr, int ncomps,
423 : int Ss, int Se, int Ah, int Al)
424 : /* Support routine: generate one scan for each component */
425 : {
426 : int ci;
427 :
428 0 : for (ci = 0; ci < ncomps; ci++) {
429 0 : scanptr->comps_in_scan = 1;
430 0 : scanptr->component_index[0] = ci;
431 0 : scanptr->Ss = Ss;
432 0 : scanptr->Se = Se;
433 0 : scanptr->Ah = Ah;
434 0 : scanptr->Al = Al;
435 0 : scanptr++;
436 : }
437 0 : return scanptr;
438 : }
439 :
440 : LOCAL(jpeg_scan_info *)
441 0 : fill_dc_scans (jpeg_scan_info *scanptr, int ncomps, int Ah, int Al)
442 : /* Support routine: generate interleaved DC scan if possible, else N scans */
443 : {
444 : int ci;
445 :
446 0 : if (ncomps <= MAX_COMPS_IN_SCAN) {
447 : /* Single interleaved DC scan */
448 0 : scanptr->comps_in_scan = ncomps;
449 0 : for (ci = 0; ci < ncomps; ci++)
450 0 : scanptr->component_index[ci] = ci;
451 0 : scanptr->Ss = scanptr->Se = 0;
452 0 : scanptr->Ah = Ah;
453 0 : scanptr->Al = Al;
454 0 : scanptr++;
455 : } else {
456 : /* Noninterleaved DC scan for each component */
457 0 : scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al);
458 : }
459 0 : return scanptr;
460 : }
461 :
462 :
463 : /*
464 : * Create a recommended progressive-JPEG script.
465 : * cinfo->num_components and cinfo->jpeg_color_space must be correct.
466 : */
467 :
468 : GLOBAL(void)
469 0 : jpeg_simple_progression (j_compress_ptr cinfo)
470 : {
471 0 : int ncomps = cinfo->num_components;
472 : int nscans;
473 : jpeg_scan_info *scanptr;
474 :
475 : /* Safety check to ensure start_compress not called yet. */
476 0 : if (cinfo->global_state != CSTATE_START)
477 0 : ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
478 :
479 : /* Figure space needed for script. Calculation must match code below! */
480 0 : if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
481 : /* Custom script for YCbCr color images. */
482 0 : nscans = 10;
483 : } else {
484 : /* All-purpose script for other color spaces. */
485 0 : if (ncomps > MAX_COMPS_IN_SCAN)
486 0 : nscans = 6 * ncomps; /* 2 DC + 4 AC scans per component */
487 : else
488 0 : nscans = 2 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */
489 : }
490 :
491 : /* Allocate space for script.
492 : * We need to put it in the permanent pool in case the application performs
493 : * multiple compressions without changing the settings. To avoid a memory
494 : * leak if jpeg_simple_progression is called repeatedly for the same JPEG
495 : * object, we try to re-use previously allocated space, and we allocate
496 : * enough space to handle YCbCr even if initially asked for grayscale.
497 : */
498 0 : if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {
499 0 : cinfo->script_space_size = MAX(nscans, 10);
500 0 : cinfo->script_space = (jpeg_scan_info *)
501 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
502 0 : cinfo->script_space_size * sizeof(jpeg_scan_info));
503 : }
504 0 : scanptr = cinfo->script_space;
505 0 : cinfo->scan_info = scanptr;
506 0 : cinfo->num_scans = nscans;
507 :
508 0 : if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
509 : /* Custom script for YCbCr color images. */
510 : /* Initial DC scan */
511 0 : scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
512 : /* Initial AC scan: get some luma data out in a hurry */
513 0 : scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2);
514 : /* Chroma data is too small to be worth expending many scans on */
515 0 : scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1);
516 0 : scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1);
517 : /* Complete spectral selection for luma AC */
518 0 : scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2);
519 : /* Refine next bit of luma AC */
520 0 : scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);
521 : /* Finish DC successive approximation */
522 0 : scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
523 : /* Finish AC successive approximation */
524 0 : scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0);
525 0 : scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0);
526 : /* Luma bottom bit comes last since it's usually largest scan */
527 0 : scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);
528 : } else {
529 : /* All-purpose script for other color spaces. */
530 : /* Successive approximation first pass */
531 0 : scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
532 0 : scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2);
533 0 : scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);
534 : /* Successive approximation second pass */
535 0 : scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);
536 : /* Successive approximation final pass */
537 0 : scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
538 0 : scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);
539 : }
540 0 : }
541 :
542 : #endif /* C_PROGRESSIVE_SUPPORTED */
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