2 * CDE - Common Desktop Environment
4 * Copyright (c) 1993-2012, The Open Group. All rights reserved.
6 * These libraries and programs are free software; you can
7 * redistribute them and/or modify them under the terms of the GNU
8 * Lesser General Public License as published by the Free Software
9 * Foundation; either version 2 of the License, or (at your option)
12 * These libraries and programs are distributed in the hope that
13 * they will be useful, but WITHOUT ANY WARRANTY; without even the
14 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU Lesser General Public License for more
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with these libraries and programs; if not, write
20 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
21 * Floor, Boston, MA 02110-1301 USA
23 /* $XConsortium: jpegint.h /main/2 1996/05/09 03:53:25 drk $ */
27 * Copyright (C) 1991-1996, Thomas G. Lane.
28 * This file is part of the Independent JPEG Group's software.
29 * For conditions of distribution and use, see the accompanying README file.
31 * This file provides common declarations for the various JPEG modules.
32 * These declarations are considered internal to the JPEG library; most
33 * applications using the library shouldn't need to include this file.
37 /* Declarations for both compression & decompression */
39 typedef enum { /* Operating modes for buffer controllers */
40 JBUF_PASS_THRU, /* Plain stripwise operation */
41 /* Remaining modes require a full-image buffer to have been created */
42 JBUF_SAVE_SOURCE, /* Run source subobject only, save output */
43 JBUF_CRANK_DEST, /* Run dest subobject only, using saved data */
44 JBUF_SAVE_AND_PASS /* Run both subobjects, save output */
47 /* Values of global_state field (jdapi.c has some dependencies on ordering!) */
48 #define CSTATE_START 100 /* after create_compress */
49 #define CSTATE_SCANNING 101 /* start_compress done, write_scanlines OK */
50 #define CSTATE_RAW_OK 102 /* start_compress done, write_raw_data OK */
51 #define CSTATE_WRCOEFS 103 /* jpeg_write_coefficients done */
52 #define DSTATE_START 200 /* after create_decompress */
53 #define DSTATE_INHEADER 201 /* reading header markers, no SOS yet */
54 #define DSTATE_READY 202 /* found SOS, ready for start_decompress */
55 #define DSTATE_PRELOAD 203 /* reading multiscan file in start_decompress*/
56 #define DSTATE_PRESCAN 204 /* performing dummy pass for 2-pass quant */
57 #define DSTATE_SCANNING 205 /* start_decompress done, read_scanlines OK */
58 #define DSTATE_RAW_OK 206 /* start_decompress done, read_raw_data OK */
59 #define DSTATE_BUFIMAGE 207 /* expecting jpeg_start_output */
60 #define DSTATE_BUFPOST 208 /* looking for SOS/EOI in jpeg_finish_output */
61 #define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */
62 #define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */
65 /* Declarations for compression modules */
67 /* Master control module */
68 struct jpeg_comp_master {
69 JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));
70 JMETHOD(void, pass_startup, (j_compress_ptr cinfo));
71 JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
73 /* State variables made visible to other modules */
74 boolean call_pass_startup; /* True if pass_startup must be called */
75 boolean is_last_pass; /* True during last pass */
78 /* Main buffer control (downsampled-data buffer) */
79 struct jpeg_c_main_controller {
80 JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
81 JMETHOD(void, process_data, (j_compress_ptr cinfo,
82 JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
83 JDIMENSION in_rows_avail));
86 /* Compression preprocessing (downsampling input buffer control) */
87 struct jpeg_c_prep_controller {
88 JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
89 JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,
91 JDIMENSION *in_row_ctr,
92 JDIMENSION in_rows_avail,
93 JSAMPIMAGE output_buf,
94 JDIMENSION *out_row_group_ctr,
95 JDIMENSION out_row_groups_avail));
98 /* Coefficient buffer control */
99 struct jpeg_c_coef_controller {
100 JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
101 JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,
102 JSAMPIMAGE input_buf));
105 /* Colorspace conversion */
106 struct jpeg_color_converter {
107 JMETHOD(void, start_pass, (j_compress_ptr cinfo));
108 JMETHOD(void, color_convert, (j_compress_ptr cinfo,
109 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
110 JDIMENSION output_row, int num_rows));
114 struct jpeg_downsampler {
115 JMETHOD(void, start_pass, (j_compress_ptr cinfo));
116 JMETHOD(void, downsample, (j_compress_ptr cinfo,
117 JSAMPIMAGE input_buf, JDIMENSION in_row_index,
118 JSAMPIMAGE output_buf,
119 JDIMENSION out_row_group_index));
121 boolean need_context_rows; /* TRUE if need rows above & below */
124 /* Forward DCT (also controls coefficient quantization) */
125 struct jpeg_forward_dct {
126 JMETHOD(void, start_pass, (j_compress_ptr cinfo));
127 /* perhaps this should be an array??? */
128 JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,
129 jpeg_component_info * compptr,
130 JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
131 JDIMENSION start_row, JDIMENSION start_col,
132 JDIMENSION num_blocks));
135 /* Entropy encoding */
136 struct jpeg_entropy_encoder {
137 JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));
138 JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data));
139 JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
143 struct jpeg_marker_writer {
144 /* write_any_marker is exported for use by applications */
145 /* Probably only COM and APPn markers should be written */
146 JMETHOD(void, write_any_marker, (j_compress_ptr cinfo, int marker,
147 const JOCTET *dataptr, unsigned int datalen));
148 JMETHOD(void, write_file_header, (j_compress_ptr cinfo));
149 JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));
150 JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));
151 JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));
152 JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));
156 /* Declarations for decompression modules */
158 /* Master control module */
159 struct jpeg_decomp_master {
160 JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));
161 JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));
163 /* State variables made visible to other modules */
164 boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */
167 /* Input control module */
168 struct jpeg_input_controller {
169 JMETHOD(int, consume_input, (j_decompress_ptr cinfo));
170 JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));
171 JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
172 JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));
174 /* State variables made visible to other modules */
175 boolean has_multiple_scans; /* True if file has multiple scans */
176 boolean eoi_reached; /* True when EOI has been consumed */
179 /* Main buffer control (downsampled-data buffer) */
180 struct jpeg_d_main_controller {
181 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
182 JMETHOD(void, process_data, (j_decompress_ptr cinfo,
183 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
184 JDIMENSION out_rows_avail));
187 /* Coefficient buffer control */
188 struct jpeg_d_coef_controller {
189 JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
190 JMETHOD(int, consume_data, (j_decompress_ptr cinfo));
191 JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));
192 JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,
193 JSAMPIMAGE output_buf));
194 /* Pointer to array of coefficient virtual arrays, or NULL if none */
195 jvirt_barray_ptr *coef_arrays;
198 /* Decompression postprocessing (color quantization buffer control) */
199 struct jpeg_d_post_controller {
200 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
201 JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
202 JSAMPIMAGE input_buf,
203 JDIMENSION *in_row_group_ctr,
204 JDIMENSION in_row_groups_avail,
205 JSAMPARRAY output_buf,
206 JDIMENSION *out_row_ctr,
207 JDIMENSION out_rows_avail));
210 /* Marker reading & parsing */
211 struct jpeg_marker_reader {
212 JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));
213 /* Read markers until SOS or EOI.
214 * Returns same codes as are defined for jpeg_consume_input:
215 * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
217 JMETHOD(int, read_markers, (j_decompress_ptr cinfo));
218 /* Read a restart marker --- exported for use by entropy decoder only */
219 jpeg_marker_parser_method read_restart_marker;
220 /* Application-overridable marker processing methods */
221 jpeg_marker_parser_method process_COM;
222 jpeg_marker_parser_method process_APPn[16];
224 /* State of marker reader --- nominally internal, but applications
225 * supplying COM or APPn handlers might like to know the state.
227 boolean saw_SOI; /* found SOI? */
228 boolean saw_SOF; /* found SOF? */
229 int next_restart_num; /* next restart number expected (0-7) */
230 unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */
233 /* Entropy decoding */
234 struct jpeg_entropy_decoder {
235 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
236 JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,
237 JBLOCKROW *MCU_data));
240 /* Inverse DCT (also performs dequantization) */
241 typedef JMETHOD(void, inverse_DCT_method_ptr,
242 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
244 JSAMPARRAY output_buf, JDIMENSION output_col));
246 struct jpeg_inverse_dct {
247 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
248 /* It is useful to allow each component to have a separate IDCT method. */
249 inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
252 /* Upsampling (note that upsampler must also call color converter) */
253 struct jpeg_upsampler {
254 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
255 JMETHOD(void, upsample, (j_decompress_ptr cinfo,
256 JSAMPIMAGE input_buf,
257 JDIMENSION *in_row_group_ctr,
258 JDIMENSION in_row_groups_avail,
259 JSAMPARRAY output_buf,
260 JDIMENSION *out_row_ctr,
261 JDIMENSION out_rows_avail));
263 boolean need_context_rows; /* TRUE if need rows above & below */
266 /* Colorspace conversion */
267 struct jpeg_color_deconverter {
268 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
269 JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
270 JSAMPIMAGE input_buf, JDIMENSION input_row,
271 JSAMPARRAY output_buf, int num_rows));
274 /* Color quantization or color precision reduction */
275 struct jpeg_color_quantizer {
276 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
277 JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
278 JSAMPARRAY input_buf, JSAMPARRAY output_buf,
280 JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
281 JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
285 /* Miscellaneous useful macros */
288 #define MAX(a,b) ((a) > (b) ? (a) : (b))
290 #define MIN(a,b) ((a) < (b) ? (a) : (b))
293 /* We assume that right shift corresponds to signed division by 2 with
294 * rounding towards minus infinity. This is correct for typical "arithmetic
295 * shift" instructions that shift in copies of the sign bit. But some
296 * C compilers implement >> with an unsigned shift. For these machines you
297 * must define RIGHT_SHIFT_IS_UNSIGNED.
298 * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.
299 * It is only applied with constant shift counts. SHIFT_TEMPS must be
300 * included in the variables of any routine using RIGHT_SHIFT.
303 #ifdef RIGHT_SHIFT_IS_UNSIGNED
304 #define SHIFT_TEMPS INT32 shift_temp;
305 #define RIGHT_SHIFT(x,shft) \
306 ((shift_temp = (x)) < 0 ? \
307 (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \
308 (shift_temp >> (shft)))
311 #define RIGHT_SHIFT(x,shft) ((x) >> (shft))
315 /* Short forms of external names for systems with brain-damaged linkers. */
317 #ifdef NEED_SHORT_EXTERNAL_NAMES
318 #define jinit_compress_master jICompress
319 #define jinit_c_master_control jICMaster
320 #define jinit_c_main_controller jICMainC
321 #define jinit_c_prep_controller jICPrepC
322 #define jinit_c_coef_controller jICCoefC
323 #define jinit_color_converter jICColor
324 #define jinit_downsampler jIDownsampler
325 #define jinit_forward_dct jIFDCT
326 #define jinit_huff_encoder jIHEncoder
327 #define jinit_phuff_encoder jIPHEncoder
328 #define jinit_marker_writer jIMWriter
329 #define jinit_master_decompress jIDMaster
330 #define jinit_d_main_controller jIDMainC
331 #define jinit_d_coef_controller jIDCoefC
332 #define jinit_d_post_controller jIDPostC
333 #define jinit_input_controller jIInCtlr
334 #define jinit_marker_reader jIMReader
335 #define jinit_huff_decoder jIHDecoder
336 #define jinit_phuff_decoder jIPHDecoder
337 #define jinit_inverse_dct jIIDCT
338 #define jinit_upsampler jIUpsampler
339 #define jinit_color_deconverter jIDColor
340 #define jinit_1pass_quantizer jI1Quant
341 #define jinit_2pass_quantizer jI2Quant
342 #define jinit_merged_upsampler jIMUpsampler
343 #define jinit_memory_mgr jIMemMgr
344 #define jdiv_round_up jDivRound
345 #define jround_up jRound
346 #define jcopy_sample_rows jCopySamples
347 #define jcopy_block_row jCopyBlocks
348 #define jzero_far jZeroFar
349 #define jpeg_zigzag_order jZIGTable
350 #define jpeg_natural_order jZAGTable
351 #endif /* NEED_SHORT_EXTERNAL_NAMES */
354 /* Compression module initialization routines */
355 EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo));
356 EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo,
357 boolean transcode_only));
358 EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo,
359 boolean need_full_buffer));
360 EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo,
361 boolean need_full_buffer));
362 EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,
363 boolean need_full_buffer));
364 EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));
365 EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));
366 EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
367 EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));
368 EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo));
369 EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));
370 /* Decompression module initialization routines */
371 EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));
372 EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo,
373 boolean need_full_buffer));
374 EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
375 boolean need_full_buffer));
376 EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,
377 boolean need_full_buffer));
378 EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));
379 EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));
380 EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));
381 EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
382 EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
383 EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));
384 EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));
385 EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));
386 EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));
387 EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo));
388 /* Memory manager initialization */
389 EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo));
391 /* Utility routines in jutils.c */
392 EXTERN(long) jdiv_round_up JPP((long a, long b));
393 EXTERN(long) jround_up JPP((long a, long b));
394 EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,
395 JSAMPARRAY output_array, int dest_row,
396 int num_rows, JDIMENSION num_cols));
397 EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,
398 JDIMENSION num_blocks));
399 EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
400 /* Constant tables in jutils.c */
401 extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
402 extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
404 /* Suppress undefined-structure complaints if necessary. */
406 #ifdef INCOMPLETE_TYPES_BROKEN
407 #ifndef AM_MEMORY_MANAGER /* only jmemmgr.c defines these */
408 struct jvirt_sarray_control { long dummy; };
409 struct jvirt_barray_control { long dummy; };
411 #endif /* INCOMPLETE_TYPES_BROKEN */