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comparison mupdf-source/thirdparty/libjpeg/jpegint.h @ 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 * jpegint.h
3 *
4 * Copyright (C) 1991-1997, Thomas G. Lane.
5 * Modified 1997-2020 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 provides common declarations for the various JPEG modules.
10 * These declarations are considered internal to the JPEG library; most
11 * applications using the library shouldn't need to include this file.
12 */
13
14
15 /* Declarations for both compression & decompression */
16
17 typedef enum { /* Operating modes for buffer controllers */
18 JBUF_PASS_THRU, /* Plain stripwise operation */
19 /* Remaining modes require a full-image buffer to have been created */
20 JBUF_SAVE_SOURCE, /* Run source subobject only, save output */
21 JBUF_CRANK_DEST, /* Run dest subobject only, using saved data */
22 JBUF_SAVE_AND_PASS /* Run both subobjects, save output */
23 } J_BUF_MODE;
24
25 /* Values of global_state field (jdapi.c has some dependencies on ordering!) */
26 #define CSTATE_START 100 /* after create_compress */
27 #define CSTATE_SCANNING 101 /* start_compress done, write_scanlines OK */
28 #define CSTATE_RAW_OK 102 /* start_compress done, write_raw_data OK */
29 #define CSTATE_WRCOEFS 103 /* jpeg_write_coefficients done */
30 #define DSTATE_START 200 /* after create_decompress */
31 #define DSTATE_INHEADER 201 /* reading header markers, no SOS yet */
32 #define DSTATE_READY 202 /* found SOS, ready for start_decompress */
33 #define DSTATE_PRELOAD 203 /* reading multiscan file in start_decompress*/
34 #define DSTATE_PRESCAN 204 /* performing dummy pass for 2-pass quant */
35 #define DSTATE_SCANNING 205 /* start_decompress done, read_scanlines OK */
36 #define DSTATE_RAW_OK 206 /* start_decompress done, read_raw_data OK */
37 #define DSTATE_BUFIMAGE 207 /* expecting jpeg_start_output */
38 #define DSTATE_BUFPOST 208 /* looking for SOS/EOI in jpeg_finish_output */
39 #define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */
40 #define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */
41
42
43 /* Declarations for compression modules */
44
45 /* Master control module */
46 struct jpeg_comp_master {
47 JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));
48 JMETHOD(void, pass_startup, (j_compress_ptr cinfo));
49 JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
50
51 /* State variables made visible to other modules */
52 boolean call_pass_startup; /* True if pass_startup must be called */
53 boolean is_last_pass; /* True during last pass */
54 };
55
56 /* Main buffer control (downsampled-data buffer) */
57 struct jpeg_c_main_controller {
58 JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
59 JMETHOD(void, process_data, (j_compress_ptr cinfo,
60 JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
61 JDIMENSION in_rows_avail));
62 };
63
64 /* Compression preprocessing (downsampling input buffer control) */
65 struct jpeg_c_prep_controller {
66 JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
67 JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,
68 JSAMPARRAY input_buf,
69 JDIMENSION *in_row_ctr,
70 JDIMENSION in_rows_avail,
71 JSAMPIMAGE output_buf,
72 JDIMENSION *out_row_group_ctr,
73 JDIMENSION out_row_groups_avail));
74 };
75
76 /* Coefficient buffer control */
77 struct jpeg_c_coef_controller {
78 JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
79 JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,
80 JSAMPIMAGE input_buf));
81 };
82
83 /* Colorspace conversion */
84 struct jpeg_color_converter {
85 JMETHOD(void, start_pass, (j_compress_ptr cinfo));
86 JMETHOD(void, color_convert, (j_compress_ptr cinfo,
87 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
88 JDIMENSION output_row, int num_rows));
89 };
90
91 /* Downsampling */
92 struct jpeg_downsampler {
93 JMETHOD(void, start_pass, (j_compress_ptr cinfo));
94 JMETHOD(void, downsample, (j_compress_ptr cinfo,
95 JSAMPIMAGE input_buf, JDIMENSION in_row_index,
96 JSAMPIMAGE output_buf,
97 JDIMENSION out_row_group_index));
98
99 boolean need_context_rows; /* TRUE if need rows above & below */
100 };
101
102 /* Forward DCT (also controls coefficient quantization) */
103 typedef JMETHOD(void, forward_DCT_ptr,
104 (j_compress_ptr cinfo, jpeg_component_info * compptr,
105 JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
106 JDIMENSION start_col, JDIMENSION num_blocks));
107
108 struct jpeg_forward_dct {
109 JMETHOD(void, start_pass, (j_compress_ptr cinfo));
110 /* It is useful to allow each component to have a separate FDCT method. */
111 forward_DCT_ptr forward_DCT[MAX_COMPONENTS];
112 };
113
114 /* Entropy encoding */
115 struct jpeg_entropy_encoder {
116 JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));
117 JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKARRAY MCU_data));
118 JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
119 };
120
121 /* Marker writing */
122 struct jpeg_marker_writer {
123 JMETHOD(void, write_file_header, (j_compress_ptr cinfo));
124 JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));
125 JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));
126 JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));
127 JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));
128 /* These routines are exported to allow insertion of extra markers */
129 /* Probably only COM and APPn markers should be written this way */
130 JMETHOD(void, write_marker_header, (j_compress_ptr cinfo, int marker,
131 unsigned int datalen));
132 JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val));
133 };
134
135
136 /* Declarations for decompression modules */
137
138 /* Master control module */
139 struct jpeg_decomp_master {
140 JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));
141 JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));
142
143 /* State variables made visible to other modules */
144 boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */
145 };
146
147 /* Input control module */
148 struct jpeg_input_controller {
149 JMETHOD(int, consume_input, (j_decompress_ptr cinfo));
150 JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));
151 JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
152 JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));
153
154 /* State variables made visible to other modules */
155 boolean has_multiple_scans; /* True if file has multiple scans */
156 boolean eoi_reached; /* True when EOI has been consumed */
157 };
158
159 /* Main buffer control (downsampled-data buffer) */
160 struct jpeg_d_main_controller {
161 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
162 JMETHOD(void, process_data, (j_decompress_ptr cinfo,
163 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
164 JDIMENSION out_rows_avail));
165 };
166
167 /* Coefficient buffer control */
168 struct jpeg_d_coef_controller {
169 JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
170 JMETHOD(int, consume_data, (j_decompress_ptr cinfo));
171 JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));
172 JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,
173 JSAMPIMAGE output_buf));
174 /* Pointer to array of coefficient virtual arrays, or NULL if none */
175 jvirt_barray_ptr *coef_arrays;
176 };
177
178 /* Decompression postprocessing (color quantization buffer control) */
179 struct jpeg_d_post_controller {
180 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
181 JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
182 JSAMPIMAGE input_buf,
183 JDIMENSION *in_row_group_ctr,
184 JDIMENSION in_row_groups_avail,
185 JSAMPARRAY output_buf,
186 JDIMENSION *out_row_ctr,
187 JDIMENSION out_rows_avail));
188 };
189
190 /* Marker reading & parsing */
191 struct jpeg_marker_reader {
192 JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));
193 /* Read markers until SOS or EOI.
194 * Returns same codes as are defined for jpeg_consume_input:
195 * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
196 */
197 JMETHOD(int, read_markers, (j_decompress_ptr cinfo));
198 /* Read a restart marker --- exported for use by entropy decoder only */
199 jpeg_marker_parser_method read_restart_marker;
200
201 /* State of marker reader --- nominally internal, but applications
202 * supplying COM or APPn handlers might like to know the state.
203 */
204 boolean saw_SOI; /* found SOI? */
205 boolean saw_SOF; /* found SOF? */
206 int next_restart_num; /* next restart number expected (0-7) */
207 unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */
208 };
209
210 /* Entropy decoding */
211 struct jpeg_entropy_decoder {
212 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
213 JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo, JBLOCKARRAY MCU_data));
214 JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
215 };
216
217 /* Inverse DCT (also performs dequantization) */
218 typedef JMETHOD(void, inverse_DCT_method_ptr,
219 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
220 JCOEFPTR coef_block,
221 JSAMPARRAY output_buf, JDIMENSION output_col));
222
223 struct jpeg_inverse_dct {
224 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
225 /* It is useful to allow each component to have a separate IDCT method. */
226 inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
227 };
228
229 /* Upsampling (note that upsampler must also call color converter) */
230 struct jpeg_upsampler {
231 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
232 JMETHOD(void, upsample, (j_decompress_ptr cinfo,
233 JSAMPIMAGE input_buf,
234 JDIMENSION *in_row_group_ctr,
235 JDIMENSION in_row_groups_avail,
236 JSAMPARRAY output_buf,
237 JDIMENSION *out_row_ctr,
238 JDIMENSION out_rows_avail));
239
240 boolean need_context_rows; /* TRUE if need rows above & below */
241 };
242
243 /* Colorspace conversion */
244 struct jpeg_color_deconverter {
245 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
246 JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
247 JSAMPIMAGE input_buf, JDIMENSION input_row,
248 JSAMPARRAY output_buf, int num_rows));
249 };
250
251 /* Color quantization or color precision reduction */
252 struct jpeg_color_quantizer {
253 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
254 JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
255 JSAMPARRAY input_buf, JSAMPARRAY output_buf,
256 int num_rows));
257 JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
258 JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
259 };
260
261
262 /* Definition of range extension bits for decompression processes.
263 * See the comments with prepare_range_limit_table (in jdmaster.c)
264 * for more info.
265 * The recommended default value for normal applications is 2.
266 * Applications with special requirements may use a different value.
267 * For example, Ghostscript wants to use 3 for proper handling of
268 * wacky images with oversize coefficient values.
269 */
270
271 #define RANGE_BITS 2
272 #define RANGE_CENTER (CENTERJSAMPLE << RANGE_BITS)
273
274
275 /* Miscellaneous useful macros */
276
277 #undef MAX
278 #define MAX(a,b) ((a) > (b) ? (a) : (b))
279 #undef MIN
280 #define MIN(a,b) ((a) < (b) ? (a) : (b))
281
282
283 /* We assume that right shift corresponds to signed division by 2 with
284 * rounding towards minus infinity. This is correct for typical "arithmetic
285 * shift" instructions that shift in copies of the sign bit. But some
286 * C compilers implement >> with an unsigned shift. For these machines you
287 * must define RIGHT_SHIFT_IS_UNSIGNED.
288 * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.
289 * It is only applied with constant shift counts. SHIFT_TEMPS must be
290 * included in the variables of any routine using RIGHT_SHIFT.
291 */
292
293 #ifdef RIGHT_SHIFT_IS_UNSIGNED
294 #define SHIFT_TEMPS INT32 shift_temp;
295 #define RIGHT_SHIFT(x,shft) \
296 ((shift_temp = (x)) < 0 ? \
297 (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \
298 (shift_temp >> (shft)))
299 #else
300 #define SHIFT_TEMPS
301 #define RIGHT_SHIFT(x,shft) ((x) >> (shft))
302 #endif
303
304 /* Descale and correctly round an INT32 value that's scaled by N bits.
305 * We assume RIGHT_SHIFT rounds towards minus infinity, so adding
306 * the fudge factor is correct for either sign of X.
307 */
308
309 #define DESCALE(x,n) RIGHT_SHIFT((x) + ((INT32) 1 << ((n)-1)), n)
310
311
312 /* Short forms of external names for systems with brain-damaged linkers. */
313
314 #ifdef NEED_SHORT_EXTERNAL_NAMES
315 #define jinit_compress_master jICompress
316 #define jinit_c_master_control jICMaster
317 #define jinit_c_main_controller jICMainC
318 #define jinit_c_prep_controller jICPrepC
319 #define jinit_c_coef_controller jICCoefC
320 #define jinit_color_converter jICColor
321 #define jinit_downsampler jIDownsampler
322 #define jinit_forward_dct jIFDCT
323 #define jinit_huff_encoder jIHEncoder
324 #define jinit_arith_encoder jIAEncoder
325 #define jinit_marker_writer jIMWriter
326 #define jinit_master_decompress jIDMaster
327 #define jinit_d_main_controller jIDMainC
328 #define jinit_d_coef_controller jIDCoefC
329 #define jinit_d_post_controller jIDPostC
330 #define jinit_input_controller jIInCtlr
331 #define jinit_marker_reader jIMReader
332 #define jinit_huff_decoder jIHDecoder
333 #define jinit_arith_decoder jIADecoder
334 #define jinit_inverse_dct jIIDCT
335 #define jinit_upsampler jIUpsampler
336 #define jinit_color_deconverter jIDColor
337 #define jinit_1pass_quantizer jI1Quant
338 #define jinit_2pass_quantizer jI2Quant
339 #define jinit_merged_upsampler jIMUpsampler
340 #define jinit_memory_mgr jIMemMgr
341 #define jdiv_round_up jDivRound
342 #define jround_up jRound
343 #define jzero_far jZeroFar
344 #define jcopy_sample_rows jCopySamples
345 #define jcopy_block_row jCopyBlocks
346 #define jpeg_zigzag_order jZIGTable
347 #define jpeg_natural_order jZAGTable
348 #define jpeg_natural_order7 jZAG7Table
349 #define jpeg_natural_order6 jZAG6Table
350 #define jpeg_natural_order5 jZAG5Table
351 #define jpeg_natural_order4 jZAG4Table
352 #define jpeg_natural_order3 jZAG3Table
353 #define jpeg_natural_order2 jZAG2Table
354 #define jpeg_aritab jAriTab
355 #endif /* NEED_SHORT_EXTERNAL_NAMES */
356
357
358 /* On normal machines we can apply MEMCOPY() and MEMZERO() to sample arrays
359 * and coefficient-block arrays. This won't work on 80x86 because the arrays
360 * are FAR and we're assuming a small-pointer memory model. However, some
361 * DOS compilers provide far-pointer versions of memcpy() and memset() even
362 * in the small-model libraries. These will be used if USE_FMEM is defined.
363 * Otherwise, the routines in jutils.c do it the hard way.
364 */
365
366 #ifndef NEED_FAR_POINTERS /* normal case, same as regular macro */
367 #define FMEMZERO(target,size) MEMZERO(target,size)
368 #else /* 80x86 case */
369 #ifdef USE_FMEM
370 #define FMEMZERO(target,size) _fmemset((void FAR *)(target), 0, (size_t)(size))
371 #else
372 EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
373 #define FMEMZERO(target,size) jzero_far(target, size)
374 #endif
375 #endif
376
377
378 /* Compression module initialization routines */
379 EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo));
380 EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo,
381 boolean transcode_only));
382 EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo,
383 boolean need_full_buffer));
384 EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo,
385 boolean need_full_buffer));
386 EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,
387 boolean need_full_buffer));
388 EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));
389 EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));
390 EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
391 EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));
392 EXTERN(void) jinit_arith_encoder JPP((j_compress_ptr cinfo));
393 EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));
394 /* Decompression module initialization routines */
395 EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));
396 EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo,
397 boolean need_full_buffer));
398 EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
399 boolean need_full_buffer));
400 EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,
401 boolean need_full_buffer));
402 EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));
403 EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));
404 EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));
405 EXTERN(void) jinit_arith_decoder JPP((j_decompress_ptr cinfo));
406 EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
407 EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));
408 EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));
409 EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));
410 EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));
411 EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo));
412 /* Memory manager initialization */
413 EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo));
414
415 /* Utility routines in jutils.c */
416 EXTERN(long) jdiv_round_up JPP((long a, long b));
417 EXTERN(long) jround_up JPP((long a, long b));
418 EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array,
419 JSAMPARRAY output_array,
420 int num_rows, JDIMENSION num_cols));
421 EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,
422 JDIMENSION num_blocks));
423 /* Constant tables in jutils.c */
424 #if 0 /* This table is not actually needed in v6a */
425 extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
426 #endif
427 extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
428 extern const int jpeg_natural_order7[]; /* zz to natural order for 7x7 block */
429 extern const int jpeg_natural_order6[]; /* zz to natural order for 6x6 block */
430 extern const int jpeg_natural_order5[]; /* zz to natural order for 5x5 block */
431 extern const int jpeg_natural_order4[]; /* zz to natural order for 4x4 block */
432 extern const int jpeg_natural_order3[]; /* zz to natural order for 3x3 block */
433 extern const int jpeg_natural_order2[]; /* zz to natural order for 2x2 block */
434
435 /* Arithmetic coding probability estimation tables in jaricom.c */
436 extern const INT32 jpeg_aritab[];
437
438 /* Suppress undefined-structure complaints if necessary. */
439
440 #ifdef INCOMPLETE_TYPES_BROKEN
441 #ifndef AM_MEMORY_MANAGER /* only jmemmgr.c defines these */
442 struct jvirt_sarray_control { long dummy; };
443 struct jvirt_barray_control { long dummy; };
444 #endif
445 #endif /* INCOMPLETE_TYPES_BROKEN */