447 lines
18 KiB
C
447 lines
18 KiB
C
/*
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* jpegint.h
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*
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* Copyright (C) 1991-1997, Thomas G. Lane.
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* Modified 1997-2019 by Guido Vollbeding.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file provides common declarations for the various JPEG modules.
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* These declarations are considered internal to the JPEG library; most
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* applications using the library shouldn't need to include this file.
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*/
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/* Declarations for both compression & decompression */
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typedef enum { /* Operating modes for buffer controllers */
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JBUF_PASS_THRU, /* Plain stripwise operation */
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/* Remaining modes require a full-image buffer to have been created */
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JBUF_SAVE_SOURCE, /* Run source subobject only, save output */
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JBUF_CRANK_DEST, /* Run dest subobject only, using saved data */
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JBUF_SAVE_AND_PASS /* Run both subobjects, save output */
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} J_BUF_MODE;
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/* Values of global_state field (jdapi.c has some dependencies on ordering!) */
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#define CSTATE_START 100 /* after create_compress */
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#define CSTATE_SCANNING 101 /* start_compress done, write_scanlines OK */
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#define CSTATE_RAW_OK 102 /* start_compress done, write_raw_data OK */
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#define CSTATE_WRCOEFS 103 /* jpeg_write_coefficients done */
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#define DSTATE_START 200 /* after create_decompress */
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#define DSTATE_INHEADER 201 /* reading header markers, no SOS yet */
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#define DSTATE_READY 202 /* found SOS, ready for start_decompress */
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#define DSTATE_PRELOAD 203 /* reading multiscan file in start_decompress*/
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#define DSTATE_PRESCAN 204 /* performing dummy pass for 2-pass quant */
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#define DSTATE_SCANNING 205 /* start_decompress done, read_scanlines OK */
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#define DSTATE_RAW_OK 206 /* start_decompress done, read_raw_data OK */
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#define DSTATE_BUFIMAGE 207 /* expecting jpeg_start_output */
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#define DSTATE_BUFPOST 208 /* looking for SOS/EOI in jpeg_finish_output */
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#define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */
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#define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */
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/* Declarations for compression modules */
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/* Master control module */
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struct jpeg_comp_master {
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JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));
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JMETHOD(void, pass_startup, (j_compress_ptr cinfo));
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JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
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/* State variables made visible to other modules */
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boolean call_pass_startup; /* True if pass_startup must be called */
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boolean is_last_pass; /* True during last pass */
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};
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/* Main buffer control (downsampled-data buffer) */
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struct jpeg_c_main_controller {
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JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
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JMETHOD(void, process_data, (j_compress_ptr cinfo,
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JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
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JDIMENSION in_rows_avail));
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};
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/* Compression preprocessing (downsampling input buffer control) */
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struct jpeg_c_prep_controller {
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JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
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JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,
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JSAMPARRAY input_buf,
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JDIMENSION *in_row_ctr,
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JDIMENSION in_rows_avail,
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JSAMPIMAGE output_buf,
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JDIMENSION *out_row_group_ctr,
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JDIMENSION out_row_groups_avail));
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};
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/* Coefficient buffer control */
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struct jpeg_c_coef_controller {
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JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
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JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,
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JSAMPIMAGE input_buf));
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};
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/* Colorspace conversion */
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struct jpeg_color_converter {
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JMETHOD(void, start_pass, (j_compress_ptr cinfo));
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JMETHOD(void, color_convert, (j_compress_ptr cinfo,
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JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
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JDIMENSION output_row, int num_rows));
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};
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/* Downsampling */
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struct jpeg_downsampler {
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JMETHOD(void, start_pass, (j_compress_ptr cinfo));
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JMETHOD(void, downsample, (j_compress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION in_row_index,
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JSAMPIMAGE output_buf,
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JDIMENSION out_row_group_index));
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boolean need_context_rows; /* TRUE if need rows above & below */
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};
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/* Forward DCT (also controls coefficient quantization) */
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typedef JMETHOD(void, forward_DCT_ptr,
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(j_compress_ptr cinfo, jpeg_component_info * compptr,
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JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
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JDIMENSION start_row, JDIMENSION start_col,
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JDIMENSION num_blocks));
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struct jpeg_forward_dct {
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JMETHOD(void, start_pass, (j_compress_ptr cinfo));
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/* It is useful to allow each component to have a separate FDCT method. */
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forward_DCT_ptr forward_DCT[MAX_COMPONENTS];
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};
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/* Entropy encoding */
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struct jpeg_entropy_encoder {
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JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));
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JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data));
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JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
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};
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/* Marker writing */
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struct jpeg_marker_writer {
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JMETHOD(void, write_file_header, (j_compress_ptr cinfo));
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JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));
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JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));
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JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));
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JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));
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/* These routines are exported to allow insertion of extra markers */
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/* Probably only COM and APPn markers should be written this way */
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JMETHOD(void, write_marker_header, (j_compress_ptr cinfo, int marker,
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unsigned int datalen));
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JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val));
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};
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/* Declarations for decompression modules */
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/* Master control module */
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struct jpeg_decomp_master {
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JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));
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JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));
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/* State variables made visible to other modules */
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boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */
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};
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/* Input control module */
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struct jpeg_input_controller {
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JMETHOD(int, consume_input, (j_decompress_ptr cinfo));
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JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));
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JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
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JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));
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/* State variables made visible to other modules */
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boolean has_multiple_scans; /* True if file has multiple scans */
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boolean eoi_reached; /* True when EOI has been consumed */
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};
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/* Main buffer control (downsampled-data buffer) */
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struct jpeg_d_main_controller {
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JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
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JMETHOD(void, process_data, (j_decompress_ptr cinfo,
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail));
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};
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/* Coefficient buffer control */
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struct jpeg_d_coef_controller {
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JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
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JMETHOD(int, consume_data, (j_decompress_ptr cinfo));
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JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));
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JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,
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JSAMPIMAGE output_buf));
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/* Pointer to array of coefficient virtual arrays, or NULL if none */
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jvirt_barray_ptr *coef_arrays;
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};
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/* Decompression postprocessing (color quantization buffer control) */
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struct jpeg_d_post_controller {
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JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
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JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf,
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JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf,
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JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail));
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};
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/* Marker reading & parsing */
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struct jpeg_marker_reader {
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JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));
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/* Read markers until SOS or EOI.
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* Returns same codes as are defined for jpeg_consume_input:
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* JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
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*/
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JMETHOD(int, read_markers, (j_decompress_ptr cinfo));
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/* Read a restart marker --- exported for use by entropy decoder only */
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jpeg_marker_parser_method read_restart_marker;
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/* State of marker reader --- nominally internal, but applications
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* supplying COM or APPn handlers might like to know the state.
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*/
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boolean saw_SOI; /* found SOI? */
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boolean saw_SOF; /* found SOF? */
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int next_restart_num; /* next restart number expected (0-7) */
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unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */
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};
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/* Entropy decoding */
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struct jpeg_entropy_decoder {
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JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
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JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo, JBLOCKROW *MCU_data));
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JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
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};
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/* Inverse DCT (also performs dequantization) */
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typedef JMETHOD(void, inverse_DCT_method_ptr,
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(j_decompress_ptr cinfo, jpeg_component_info * compptr,
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JCOEFPTR coef_block,
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JSAMPARRAY output_buf, JDIMENSION output_col));
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struct jpeg_inverse_dct {
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JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
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/* It is useful to allow each component to have a separate IDCT method. */
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inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
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};
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/* Upsampling (note that upsampler must also call color converter) */
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struct jpeg_upsampler {
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JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
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JMETHOD(void, upsample, (j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf,
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JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf,
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JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail));
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boolean need_context_rows; /* TRUE if need rows above & below */
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};
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/* Colorspace conversion */
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struct jpeg_color_deconverter {
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JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
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JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION input_row,
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JSAMPARRAY output_buf, int num_rows));
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};
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/* Color quantization or color precision reduction */
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struct jpeg_color_quantizer {
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JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
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JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
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JSAMPARRAY input_buf, JSAMPARRAY output_buf,
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int num_rows));
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JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
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JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
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};
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/* Definition of range extension bits for decompression processes.
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* See the comments with prepare_range_limit_table (in jdmaster.c)
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* for more info.
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* The recommended default value for normal applications is 2.
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* Applications with special requirements may use a different value.
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* For example, Ghostscript wants to use 3 for proper handling of
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* wacky images with oversize coefficient values.
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*/
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#define RANGE_BITS 2
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#define RANGE_CENTER (CENTERJSAMPLE << RANGE_BITS)
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/* Miscellaneous useful macros */
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#undef MAX
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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#undef MIN
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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/* We assume that right shift corresponds to signed division by 2 with
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* rounding towards minus infinity. This is correct for typical "arithmetic
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* shift" instructions that shift in copies of the sign bit. But some
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* C compilers implement >> with an unsigned shift. For these machines you
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* must define RIGHT_SHIFT_IS_UNSIGNED.
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* RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.
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* It is only applied with constant shift counts. SHIFT_TEMPS must be
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* included in the variables of any routine using RIGHT_SHIFT.
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*/
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#ifdef RIGHT_SHIFT_IS_UNSIGNED
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#define SHIFT_TEMPS INT32 shift_temp;
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#define RIGHT_SHIFT(x,shft) \
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((shift_temp = (x)) < 0 ? \
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(shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \
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(shift_temp >> (shft)))
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#else
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#define SHIFT_TEMPS
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#define RIGHT_SHIFT(x,shft) ((x) >> (shft))
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#endif
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/* Descale and correctly round an INT32 value that's scaled by N bits.
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* We assume RIGHT_SHIFT rounds towards minus infinity, so adding
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* the fudge factor is correct for either sign of X.
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*/
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#define DESCALE(x,n) RIGHT_SHIFT((x) + ((INT32) 1 << ((n)-1)), n)
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/* Short forms of external names for systems with brain-damaged linkers. */
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#ifdef NEED_SHORT_EXTERNAL_NAMES
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#define jinit_compress_master jICompress
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#define jinit_c_master_control jICMaster
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#define jinit_c_main_controller jICMainC
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#define jinit_c_prep_controller jICPrepC
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#define jinit_c_coef_controller jICCoefC
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#define jinit_color_converter jICColor
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#define jinit_downsampler jIDownsampler
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#define jinit_forward_dct jIFDCT
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#define jinit_huff_encoder jIHEncoder
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#define jinit_arith_encoder jIAEncoder
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#define jinit_marker_writer jIMWriter
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#define jinit_master_decompress jIDMaster
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#define jinit_d_main_controller jIDMainC
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#define jinit_d_coef_controller jIDCoefC
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#define jinit_d_post_controller jIDPostC
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#define jinit_input_controller jIInCtlr
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#define jinit_marker_reader jIMReader
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#define jinit_huff_decoder jIHDecoder
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#define jinit_arith_decoder jIADecoder
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#define jinit_inverse_dct jIIDCT
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#define jinit_upsampler jIUpsampler
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#define jinit_color_deconverter jIDColor
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#define jinit_1pass_quantizer jI1Quant
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#define jinit_2pass_quantizer jI2Quant
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#define jinit_merged_upsampler jIMUpsampler
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#define jinit_memory_mgr jIMemMgr
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#define jdiv_round_up jDivRound
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#define jround_up jRound
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#define jzero_far jZeroFar
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#define jcopy_sample_rows jCopySamples
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#define jcopy_block_row jCopyBlocks
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#define jpeg_zigzag_order jZIGTable
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#define jpeg_natural_order jZAGTable
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#define jpeg_natural_order7 jZAG7Table
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#define jpeg_natural_order6 jZAG6Table
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#define jpeg_natural_order5 jZAG5Table
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#define jpeg_natural_order4 jZAG4Table
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#define jpeg_natural_order3 jZAG3Table
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#define jpeg_natural_order2 jZAG2Table
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#define jpeg_aritab jAriTab
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#endif /* NEED_SHORT_EXTERNAL_NAMES */
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/* On normal machines we can apply MEMCOPY() and MEMZERO() to sample arrays
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* and coefficient-block arrays. This won't work on 80x86 because the arrays
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* are FAR and we're assuming a small-pointer memory model. However, some
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* DOS compilers provide far-pointer versions of memcpy() and memset() even
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* in the small-model libraries. These will be used if USE_FMEM is defined.
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* Otherwise, the routines in jutils.c do it the hard way.
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*/
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#ifndef NEED_FAR_POINTERS /* normal case, same as regular macro */
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#define FMEMZERO(target,size) MEMZERO(target,size)
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#else /* 80x86 case */
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#ifdef USE_FMEM
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#define FMEMZERO(target,size) _fmemset((void FAR *)(target), 0, (size_t)(size))
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#else
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EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
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#define FMEMZERO(target,size) jzero_far(target, size)
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#endif
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#endif
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/* Compression module initialization routines */
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EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo));
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EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo,
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boolean transcode_only));
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EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo,
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boolean need_full_buffer));
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EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo,
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boolean need_full_buffer));
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EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,
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boolean need_full_buffer));
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EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));
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EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));
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EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
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EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));
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EXTERN(void) jinit_arith_encoder JPP((j_compress_ptr cinfo));
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EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));
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/* Decompression module initialization routines */
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EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo,
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boolean need_full_buffer));
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EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
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boolean need_full_buffer));
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EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,
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boolean need_full_buffer));
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EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_arith_decoder JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));
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EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo));
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/* Memory manager initialization */
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EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo));
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/* Utility routines in jutils.c */
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EXTERN(long) jdiv_round_up JPP((long a, long b));
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EXTERN(long) jround_up JPP((long a, long b));
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EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,
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JSAMPARRAY output_array, int dest_row,
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int num_rows, JDIMENSION num_cols));
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EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,
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JDIMENSION num_blocks));
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/* Constant tables in jutils.c */
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#if 0 /* This table is not actually needed in v6a */
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extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
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#endif
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extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
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extern const int jpeg_natural_order7[]; /* zz to natural order for 7x7 block */
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extern const int jpeg_natural_order6[]; /* zz to natural order for 6x6 block */
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extern const int jpeg_natural_order5[]; /* zz to natural order for 5x5 block */
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extern const int jpeg_natural_order4[]; /* zz to natural order for 4x4 block */
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extern const int jpeg_natural_order3[]; /* zz to natural order for 3x3 block */
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extern const int jpeg_natural_order2[]; /* zz to natural order for 2x2 block */
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/* Arithmetic coding probability estimation tables in jaricom.c */
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extern const INT32 jpeg_aritab[];
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/* Suppress undefined-structure complaints if necessary. */
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#ifdef INCOMPLETE_TYPES_BROKEN
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#ifndef AM_MEMORY_MANAGER /* only jmemmgr.c defines these */
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struct jvirt_sarray_control { long dummy; };
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struct jvirt_barray_control { long dummy; };
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#endif
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#endif /* INCOMPLETE_TYPES_BROKEN */
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