media/libjpeg/jpegint.h@b8a032363ba2
media/libjpeg/jpegint.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
1 /*
2 * jpegint.h
3 *
4 * Copyright (C) 1991-1997, Thomas G. Lane.
5 * Modified 1997-2009 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 */
15 /* Declarations for both compression & decompression */
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;
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 */
43 /* Declarations for compression modules */
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));
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 };
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 };
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 };
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 };
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 };
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));
99 boolean need_context_rows; /* TRUE if need rows above & below */
100 };
102 /* Forward DCT (also controls coefficient quantization) */
103 struct jpeg_forward_dct {
104 JMETHOD(void, start_pass, (j_compress_ptr cinfo));
105 /* perhaps this should be an array??? */
106 JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,
107 jpeg_component_info * compptr,
108 JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
109 JDIMENSION start_row, JDIMENSION start_col,
110 JDIMENSION num_blocks));
111 };
113 /* Entropy encoding */
114 struct jpeg_entropy_encoder {
115 JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));
116 JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data));
117 JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
118 };
120 /* Marker writing */
121 struct jpeg_marker_writer {
122 JMETHOD(void, write_file_header, (j_compress_ptr cinfo));
123 JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));
124 JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));
125 JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));
126 JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));
127 /* These routines are exported to allow insertion of extra markers */
128 /* Probably only COM and APPn markers should be written this way */
129 JMETHOD(void, write_marker_header, (j_compress_ptr cinfo, int marker,
130 unsigned int datalen));
131 JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val));
132 };
135 /* Declarations for decompression modules */
137 /* Master control module */
138 struct jpeg_decomp_master {
139 JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));
140 JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));
142 /* State variables made visible to other modules */
143 boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */
144 };
146 /* Input control module */
147 struct jpeg_input_controller {
148 JMETHOD(int, consume_input, (j_decompress_ptr cinfo));
149 JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));
150 JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
151 JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));
153 /* State variables made visible to other modules */
154 boolean has_multiple_scans; /* True if file has multiple scans */
155 boolean eoi_reached; /* True when EOI has been consumed */
156 };
158 /* Main buffer control (downsampled-data buffer) */
159 struct jpeg_d_main_controller {
160 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
161 JMETHOD(void, process_data, (j_decompress_ptr cinfo,
162 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
163 JDIMENSION out_rows_avail));
164 };
166 /* Coefficient buffer control */
167 struct jpeg_d_coef_controller {
168 JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
169 JMETHOD(int, consume_data, (j_decompress_ptr cinfo));
170 JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));
171 JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,
172 JSAMPIMAGE output_buf));
173 /* Pointer to array of coefficient virtual arrays, or NULL if none */
174 jvirt_barray_ptr *coef_arrays;
175 };
177 /* Decompression postprocessing (color quantization buffer control) */
178 struct jpeg_d_post_controller {
179 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
180 JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
181 JSAMPIMAGE input_buf,
182 JDIMENSION *in_row_group_ctr,
183 JDIMENSION in_row_groups_avail,
184 JSAMPARRAY output_buf,
185 JDIMENSION *out_row_ctr,
186 JDIMENSION out_rows_avail));
187 };
189 /* Marker reading & parsing */
190 struct jpeg_marker_reader {
191 JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));
192 /* Read markers until SOS or EOI.
193 * Returns same codes as are defined for jpeg_consume_input:
194 * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
195 */
196 JMETHOD(int, read_markers, (j_decompress_ptr cinfo));
197 /* Read a restart marker --- exported for use by entropy decoder only */
198 jpeg_marker_parser_method read_restart_marker;
200 /* State of marker reader --- nominally internal, but applications
201 * supplying COM or APPn handlers might like to know the state.
202 */
203 boolean saw_SOI; /* found SOI? */
204 boolean saw_SOF; /* found SOF? */
205 int next_restart_num; /* next restart number expected (0-7) */
206 unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */
207 };
209 /* Entropy decoding */
210 struct jpeg_entropy_decoder {
211 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
212 JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,
213 JBLOCKROW *MCU_data));
215 /* This is here to share code between baseline and progressive decoders; */
216 /* other modules probably should not use it */
217 boolean insufficient_data; /* set TRUE after emitting warning */
218 };
220 /* Inverse DCT (also performs dequantization) */
221 typedef JMETHOD(void, inverse_DCT_method_ptr,
222 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
223 JCOEFPTR coef_block,
224 JSAMPARRAY output_buf, JDIMENSION output_col));
226 struct jpeg_inverse_dct {
227 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
228 /* It is useful to allow each component to have a separate IDCT method. */
229 inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
230 };
232 /* Upsampling (note that upsampler must also call color converter) */
233 struct jpeg_upsampler {
234 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
235 JMETHOD(void, upsample, (j_decompress_ptr cinfo,
236 JSAMPIMAGE input_buf,
237 JDIMENSION *in_row_group_ctr,
238 JDIMENSION in_row_groups_avail,
239 JSAMPARRAY output_buf,
240 JDIMENSION *out_row_ctr,
241 JDIMENSION out_rows_avail));
243 boolean need_context_rows; /* TRUE if need rows above & below */
244 };
246 /* Colorspace conversion */
247 struct jpeg_color_deconverter {
248 JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
249 JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
250 JSAMPIMAGE input_buf, JDIMENSION input_row,
251 JSAMPARRAY output_buf, int num_rows));
252 };
254 /* Color quantization or color precision reduction */
255 struct jpeg_color_quantizer {
256 JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
257 JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
258 JSAMPARRAY input_buf, JSAMPARRAY output_buf,
259 int num_rows));
260 JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
261 JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
262 };
265 /* Miscellaneous useful macros */
267 #undef MAX
268 #define MAX(a,b) ((a) > (b) ? (a) : (b))
269 #undef MIN
270 #define MIN(a,b) ((a) < (b) ? (a) : (b))
273 /* We assume that right shift corresponds to signed division by 2 with
274 * rounding towards minus infinity. This is correct for typical "arithmetic
275 * shift" instructions that shift in copies of the sign bit. But some
276 * C compilers implement >> with an unsigned shift. For these machines you
277 * must define RIGHT_SHIFT_IS_UNSIGNED.
278 * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.
279 * It is only applied with constant shift counts. SHIFT_TEMPS must be
280 * included in the variables of any routine using RIGHT_SHIFT.
281 */
283 #ifdef RIGHT_SHIFT_IS_UNSIGNED
284 #define SHIFT_TEMPS INT32 shift_temp;
285 #define RIGHT_SHIFT(x,shft) \
286 ((shift_temp = (x)) < 0 ? \
287 (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \
288 (shift_temp >> (shft)))
289 #else
290 #define SHIFT_TEMPS
291 #define RIGHT_SHIFT(x,shft) ((x) >> (shft))
292 #endif
295 /* Short forms of external names for systems with brain-damaged linkers. */
297 #ifdef NEED_SHORT_EXTERNAL_NAMES
298 #define jinit_compress_master jICompress
299 #define jinit_c_master_control jICMaster
300 #define jinit_c_main_controller jICMainC
301 #define jinit_c_prep_controller jICPrepC
302 #define jinit_c_coef_controller jICCoefC
303 #define jinit_color_converter jICColor
304 #define jinit_downsampler jIDownsampler
305 #define jinit_forward_dct jIFDCT
306 #define jinit_huff_encoder jIHEncoder
307 #define jinit_phuff_encoder jIPHEncoder
308 #define jinit_arith_encoder jIAEncoder
309 #define jinit_marker_writer jIMWriter
310 #define jinit_master_decompress jIDMaster
311 #define jinit_d_main_controller jIDMainC
312 #define jinit_d_coef_controller jIDCoefC
313 #define jinit_d_post_controller jIDPostC
314 #define jinit_input_controller jIInCtlr
315 #define jinit_marker_reader jIMReader
316 #define jinit_huff_decoder jIHDecoder
317 #define jinit_phuff_decoder jIPHDecoder
318 #define jinit_arith_decoder jIADecoder
319 #define jinit_inverse_dct jIIDCT
320 #define jinit_upsampler jIUpsampler
321 #define jinit_color_deconverter jIDColor
322 #define jinit_1pass_quantizer jI1Quant
323 #define jinit_2pass_quantizer jI2Quant
324 #define jinit_merged_upsampler jIMUpsampler
325 #define jinit_memory_mgr jIMemMgr
326 #define jdiv_round_up jDivRound
327 #define jround_up jRound
328 #define jcopy_sample_rows jCopySamples
329 #define jcopy_block_row jCopyBlocks
330 #define jzero_far jZeroFar
331 #define jpeg_zigzag_order jZIGTable
332 #define jpeg_natural_order jZAGTable
333 #define jpeg_aritab jAriTab
334 #endif /* NEED_SHORT_EXTERNAL_NAMES */
337 /* Compression module initialization routines */
338 EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo));
339 EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo,
340 boolean transcode_only));
341 EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo,
342 boolean need_full_buffer));
343 EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo,
344 boolean need_full_buffer));
345 EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,
346 boolean need_full_buffer));
347 EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));
348 EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));
349 EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
350 EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));
351 EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo));
352 EXTERN(void) jinit_arith_encoder JPP((j_compress_ptr cinfo));
353 EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));
354 /* Decompression module initialization routines */
355 EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));
356 EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo,
357 boolean need_full_buffer));
358 EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
359 boolean need_full_buffer));
360 EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,
361 boolean need_full_buffer));
362 EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));
363 EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));
364 EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));
365 EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
366 EXTERN(void) jinit_arith_decoder JPP((j_decompress_ptr cinfo));
367 EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
368 EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));
369 EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));
370 EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));
371 EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));
372 EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo));
373 /* Memory manager initialization */
374 EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo));
376 /* Utility routines in jutils.c */
377 EXTERN(long) jdiv_round_up JPP((long a, long b));
378 EXTERN(long) jround_up JPP((long a, long b));
379 EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,
380 JSAMPARRAY output_array, int dest_row,
381 int num_rows, JDIMENSION num_cols));
382 EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,
383 JDIMENSION num_blocks));
384 EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
385 /* Constant tables in jutils.c */
386 #if 0 /* This table is not actually needed in v6a */
387 extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
388 #endif
389 extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
391 /* Arithmetic coding probability estimation tables in jaricom.c */
392 extern const INT32 jpeg_aritab[];
394 /* Suppress undefined-structure complaints if necessary. */
396 #ifdef INCOMPLETE_TYPES_BROKEN
397 #ifndef AM_MEMORY_MANAGER /* only jmemmgr.c defines these */
398 struct jvirt_sarray_control { long dummy; };
399 struct jvirt_barray_control { long dummy; };
400 #endif
401 #endif /* INCOMPLETE_TYPES_BROKEN */
