src/3rdparty/libjpeg/jpegint.h
author Alex Gilkes <alex.gilkes@nokia.com>
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/*
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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 */