JPEGINT.h
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- ////////////////////////////////////////////////////////////////////////
- //
- // Note : this file is included as part of the Smaller Animals Software
- // JpegFile package. Though this file has not been modified from it's
- // original IJG 6a form, it is not the responsibility on the Independent
- // JPEG Group to answer questions regarding this code.
- //
- // Any questions you have about this code should be addressed to :
- //
- // CHRISDL@PAGESZ.NET - the distributor of this package.
- //
- // Remember, by including this code in the JpegFile package, Smaller
- // Animals Software assumes all responsibilities for answering questions
- // about it. If we (SA Software) can't answer your questions ourselves, we
- // will direct you to people who can.
- //
- // Thanks, CDL.
- //
- ////////////////////////////////////////////////////////////////////////
- /*
- * jpegint.h
- *
- * Copyright (C) 1991-1996, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file provides common declarations for the various JPEG modules.
- * These declarations are considered internal to the JPEG library; most
- * applications using the library shouldn't need to include this file.
- */
- /* Declarations for both compression & decompression */
- typedef enum { /* Operating modes for buffer controllers */
- JBUF_PASS_THRU, /* Plain stripwise operation */
- /* Remaining modes require a full-image buffer to have been created */
- JBUF_SAVE_SOURCE, /* Run source subobject only, save output */
- JBUF_CRANK_DEST, /* Run dest subobject only, using saved data */
- JBUF_SAVE_AND_PASS /* Run both subobjects, save output */
- } J_BUF_MODE;
- /* Values of global_state field (jdapi.c has some dependencies on ordering!) */
- #define CSTATE_START 100 /* after create_compress */
- #define CSTATE_SCANNING 101 /* start_compress done, write_scanlines OK */
- #define CSTATE_RAW_OK 102 /* start_compress done, write_raw_data OK */
- #define CSTATE_WRCOEFS 103 /* jpeg_write_coefficients done */
- #define DSTATE_START 200 /* after create_decompress */
- #define DSTATE_INHEADER 201 /* reading header markers, no SOS yet */
- #define DSTATE_READY 202 /* found SOS, ready for start_decompress */
- #define DSTATE_PRELOAD 203 /* reading multiscan file in start_decompress*/
- #define DSTATE_PRESCAN 204 /* performing dummy pass for 2-pass quant */
- #define DSTATE_SCANNING 205 /* start_decompress done, read_scanlines OK */
- #define DSTATE_RAW_OK 206 /* start_decompress done, read_raw_data OK */
- #define DSTATE_BUFIMAGE 207 /* expecting jpeg_start_output */
- #define DSTATE_BUFPOST 208 /* looking for SOS/EOI in jpeg_finish_output */
- #define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */
- #define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */
- /* Declarations for compression modules */
- /* Master control module */
- struct jpeg_comp_master {
- JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));
- JMETHOD(void, pass_startup, (j_compress_ptr cinfo));
- JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
- /* State variables made visible to other modules */
- boolean call_pass_startup; /* True if pass_startup must be called */
- boolean is_last_pass; /* True during last pass */
- };
- /* Main buffer control (downsampled-data buffer) */
- struct jpeg_c_main_controller {
- JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
- JMETHOD(void, process_data, (j_compress_ptr cinfo,
- JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
- JDIMENSION in_rows_avail));
- };
- /* Compression preprocessing (downsampling input buffer control) */
- struct jpeg_c_prep_controller {
- JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
- JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,
- JSAMPARRAY input_buf,
- JDIMENSION *in_row_ctr,
- JDIMENSION in_rows_avail,
- JSAMPIMAGE output_buf,
- JDIMENSION *out_row_group_ctr,
- JDIMENSION out_row_groups_avail));
- };
- /* Coefficient buffer control */
- struct jpeg_c_coef_controller {
- JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
- JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,
- JSAMPIMAGE input_buf));
- };
- /* Colorspace conversion */
- struct jpeg_color_converter {
- JMETHOD(void, start_pass, (j_compress_ptr cinfo));
- JMETHOD(void, color_convert, (j_compress_ptr cinfo,
- JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
- JDIMENSION output_row, int num_rows));
- };
- /* Downsampling */
- struct jpeg_downsampler {
- JMETHOD(void, start_pass, (j_compress_ptr cinfo));
- JMETHOD(void, downsample, (j_compress_ptr cinfo,
- JSAMPIMAGE input_buf, JDIMENSION in_row_index,
- JSAMPIMAGE output_buf,
- JDIMENSION out_row_group_index));
- boolean need_context_rows; /* TRUE if need rows above & below */
- };
- /* Forward DCT (also controls coefficient quantization) */
- struct jpeg_forward_dct {
- JMETHOD(void, start_pass, (j_compress_ptr cinfo));
- /* perhaps this should be an array??? */
- JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,
- jpeg_component_info * compptr,
- JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
- JDIMENSION start_row, JDIMENSION start_col,
- JDIMENSION num_blocks));
- };
- /* Entropy encoding */
- struct jpeg_entropy_encoder {
- JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));
- JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data));
- JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
- };
- /* Marker writing */
- struct jpeg_marker_writer {
- /* write_any_marker is exported for use by applications */
- /* Probably only COM and APPn markers should be written */
- JMETHOD(void, write_any_marker, (j_compress_ptr cinfo, int marker,
- const JOCTET *dataptr, unsigned int datalen));
- JMETHOD(void, write_file_header, (j_compress_ptr cinfo));
- JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));
- JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));
- JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));
- JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));
- };
- /* Declarations for decompression modules */
- /* Master control module */
- struct jpeg_decomp_master {
- JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));
- JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));
- /* State variables made visible to other modules */
- boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */
- };
- /* Input control module */
- struct jpeg_input_controller {
- JMETHOD(int, consume_input, (j_decompress_ptr cinfo));
- JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));
- JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
- JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));
- /* State variables made visible to other modules */
- boolean has_multiple_scans; /* True if file has multiple scans */
- boolean eoi_reached; /* True when EOI has been consumed */
- };
- /* Main buffer control (downsampled-data buffer) */
- struct jpeg_d_main_controller {
- JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
- JMETHOD(void, process_data, (j_decompress_ptr cinfo,
- JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
- JDIMENSION out_rows_avail));
- };
- /* Coefficient buffer control */
- struct jpeg_d_coef_controller {
- JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
- JMETHOD(int, consume_data, (j_decompress_ptr cinfo));
- JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));
- JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,
- JSAMPIMAGE output_buf));
- /* Pointer to array of coefficient virtual arrays, or NULL if none */
- jvirt_barray_ptr *coef_arrays;
- };
- /* Decompression postprocessing (color quantization buffer control) */
- struct jpeg_d_post_controller {
- JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
- JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
- JSAMPIMAGE input_buf,
- JDIMENSION *in_row_group_ctr,
- JDIMENSION in_row_groups_avail,
- JSAMPARRAY output_buf,
- JDIMENSION *out_row_ctr,
- JDIMENSION out_rows_avail));
- };
- /* Marker reading & parsing */
- struct jpeg_marker_reader {
- JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));
- /* Read markers until SOS or EOI.
- * Returns same codes as are defined for jpeg_consume_input:
- * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
- */
- JMETHOD(int, read_markers, (j_decompress_ptr cinfo));
- /* Read a restart marker --- exported for use by entropy decoder only */
- jpeg_marker_parser_method read_restart_marker;
- /* Application-overridable marker processing methods */
- jpeg_marker_parser_method process_COM;
- jpeg_marker_parser_method process_APPn[16];
- /* State of marker reader --- nominally internal, but applications
- * supplying COM or APPn handlers might like to know the state.
- */
- boolean saw_SOI; /* found SOI? */
- boolean saw_SOF; /* found SOF? */
- int next_restart_num; /* next restart number expected (0-7) */
- unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */
- };
- /* Entropy decoding */
- struct jpeg_entropy_decoder {
- JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
- JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,
- JBLOCKROW *MCU_data));
- };
- /* Inverse DCT (also performs dequantization) */
- typedef JMETHOD(void, inverse_DCT_method_ptr,
- (j_decompress_ptr cinfo, jpeg_component_info * compptr,
- JCOEFPTR coef_block,
- JSAMPARRAY output_buf, JDIMENSION output_col));
- struct jpeg_inverse_dct {
- JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
- /* It is useful to allow each component to have a separate IDCT method. */
- inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
- };
- /* Upsampling (note that upsampler must also call color converter) */
- struct jpeg_upsampler {
- JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
- JMETHOD(void, upsample, (j_decompress_ptr cinfo,
- JSAMPIMAGE input_buf,
- JDIMENSION *in_row_group_ctr,
- JDIMENSION in_row_groups_avail,
- JSAMPARRAY output_buf,
- JDIMENSION *out_row_ctr,
- JDIMENSION out_rows_avail));
- boolean need_context_rows; /* TRUE if need rows above & below */
- };
- /* Colorspace conversion */
- struct jpeg_color_deconverter {
- JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
- JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
- JSAMPIMAGE input_buf, JDIMENSION input_row,
- JSAMPARRAY output_buf, int num_rows));
- };
- /* Color quantization or color precision reduction */
- struct jpeg_color_quantizer {
- JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
- JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
- JSAMPARRAY input_buf, JSAMPARRAY output_buf,
- int num_rows));
- JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
- JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
- };
- /* Miscellaneous useful macros */
- #undef MAX
- #define MAX(a,b) ((a) > (b) ? (a) : (b))
- #undef MIN
- #define MIN(a,b) ((a) < (b) ? (a) : (b))
- /* We assume that right shift corresponds to signed division by 2 with
- * rounding towards minus infinity. This is correct for typical "arithmetic
- * shift" instructions that shift in copies of the sign bit. But some
- * C compilers implement >> with an unsigned shift. For these machines you
- * must define RIGHT_SHIFT_IS_UNSIGNED.
- * RIGHT_SHIFT provides a proper signed right shift of an long quantity.
- * It is only applied with constant shift counts. SHIFT_TEMPS must be
- * included in the variables of any routine using RIGHT_SHIFT.
- */
- #ifdef RIGHT_SHIFT_IS_UNSIGNED
- #define SHIFT_TEMPS long shift_temp;
- #define RIGHT_SHIFT(x,shft)
- ((shift_temp = (x)) < 0 ?
- (shift_temp >> (shft)) | ((~((long) 0)) << (32-(shft))) :
- (shift_temp >> (shft)))
- #else
- #define SHIFT_TEMPS
- #define RIGHT_SHIFT(x,shft) ((x) >> (shft))
- #endif
- /* Short forms of external names for systems with brain-damaged linkers. */
- #ifdef NEED_SHORT_EXTERNAL_NAMES
- #define jinit_compress_master jICompress
- #define jinit_c_master_control jICMaster
- #define jinit_c_main_controller jICMainC
- #define jinit_c_prep_controller jICPrepC
- #define jinit_c_coef_controller jICCoefC
- #define jinit_color_converter jICColor
- #define jinit_downsampler jIDownsampler
- #define jinit_forward_dct jIFDCT
- #define jinit_huff_encoder jIHEncoder
- #define jinit_phuff_encoder jIPHEncoder
- #define jinit_marker_writer jIMWriter
- #define jinit_master_decompress jIDMaster
- #define jinit_d_main_controller jIDMainC
- #define jinit_d_coef_controller jIDCoefC
- #define jinit_d_post_controller jIDPostC
- #define jinit_input_controller jIInCtlr
- #define jinit_marker_reader jIMReader
- #define jinit_huff_decoder jIHDecoder
- #define jinit_phuff_decoder jIPHDecoder
- #define jinit_inverse_dct jIIDCT
- #define jinit_upsampler jIUpsampler
- #define jinit_color_deconverter jIDColor
- #define jinit_1pass_quantizer jI1Quant
- #define jinit_2pass_quantizer jI2Quant
- #define jinit_merged_upsampler jIMUpsampler
- #define jinit_memory_mgr jIMemMgr
- #define jdiv_round_up jDivRound
- #define jround_up jRound
- #define jcopy_sample_rows jCopySamples
- #define jcopy_block_row jCopyBlocks
- #define jzero_far jZeroFar
- #define jpeg_zigzag_order jZIGTable
- #define jpeg_natural_order jZAGTable
- #endif /* NEED_SHORT_EXTERNAL_NAMES */
- /* Compression module initialization routines */
- EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo));
- EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo,
- boolean transcode_only));
- EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo,
- boolean need_full_buffer));
- EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo,
- boolean need_full_buffer));
- EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,
- boolean need_full_buffer));
- EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));
- EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));
- EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
- EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));
- EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo));
- EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));
- /* Decompression module initialization routines */
- EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo,
- boolean need_full_buffer));
- EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
- boolean need_full_buffer));
- EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,
- boolean need_full_buffer));
- EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));
- EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo));
- /* Memory manager initialization */
- EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo));
- /* Utility routines in jutils.c */
- EXTERN(long) jdiv_round_up JPP((long a, long b));
- EXTERN(long) jround_up JPP((long a, long b));
- EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,
- JSAMPARRAY output_array, int dest_row,
- int num_rows, JDIMENSION num_cols));
- EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,
- JDIMENSION num_blocks));
- EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
- /* Constant tables in jutils.c */
- extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
- extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
- /* Suppress undefined-structure complaints if necessary. */
- #ifdef INCOMPLETE_TYPES_BROKEN
- #ifndef AM_MEMORY_MANAGER /* only jmemmgr.c defines these */
- struct jvirt_sarray_control { long dummy; };
- struct jvirt_barray_control { long dummy; };
- #endif
- #endif /* INCOMPLETE_TYPES_BROKEN */