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392 lines
16 KiB
392 lines
16 KiB
/* |
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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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* 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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struct jpeg_forward_dct { |
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JMETHOD(void, start_pass, (j_compress_ptr cinfo)); |
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/* perhaps this should be an array??? */ |
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JMETHOD(void, forward_DCT, (j_compress_ptr cinfo, |
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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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}; |
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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, |
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JBLOCKROW *MCU_data)); |
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/* This is here to share code between baseline and progressive decoders; */ |
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/* other modules probably should not use it */ |
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boolean insufficient_data; /* set TRUE after emitting warning */ |
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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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/* 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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/* 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_phuff_encoder jIPHEncoder |
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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_phuff_decoder jIPHDecoder |
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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 jcopy_sample_rows jCopySamples |
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#define jcopy_block_row jCopyBlocks |
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#define jzero_far jZeroFar |
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#define jpeg_zigzag_order jZIGTable |
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#define jpeg_natural_order jZAGTable |
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#endif /* NEED_SHORT_EXTERNAL_NAMES */ |
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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_phuff_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_phuff_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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EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero)); |
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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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/* 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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