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