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* jpegint.h

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* This file was part of the Independent JPEG Group's software:

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* Modified 1997-2009 by Guido Vollbeding.

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* libjpeg-turbo Modifications:

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* For conditions of distribution and use, see the accompanying README.ijg

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* file.

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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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/* 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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/* JLONG must hold at least signed 32-bit values. */

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typedef long JLONG;

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* Left shift macro that handles a negative operand without causing any

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* sanitizer warnings

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#define LEFT_SHIFT(a, b) ((JLONG)((unsigned long)(a) << (b)))

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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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void (*prepare_for_pass) (j_compress_ptr cinfo);

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void (*pass_startup) (j_compress_ptr cinfo);

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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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void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode);

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void (*process_data) (j_compress_ptr cinfo, JSAMPARRAY input_buf,

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JDIMENSION *in_row_ctr, 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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void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode);

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void (*pre_process_data) (j_compress_ptr cinfo, JSAMPARRAY input_buf,

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JDIMENSION *in_row_ctr, 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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void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode);

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boolean (*compress_data) (j_compress_ptr cinfo, 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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void (*start_pass) (j_compress_ptr cinfo);

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void (*color_convert) (j_compress_ptr cinfo, JSAMPARRAY input_buf,

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JSAMPIMAGE output_buf, JDIMENSION output_row,

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int num_rows);

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};

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/* Downsampling */

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struct jpeg_downsampler {

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void (*start_pass) (j_compress_ptr cinfo);

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void (*downsample) (j_compress_ptr cinfo, JSAMPIMAGE input_buf,

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JDIMENSION in_row_index, 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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void (*start_pass) (j_compress_ptr cinfo);

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/* perhaps this should be an array??? */

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void (*forward_DCT) (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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};

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/* Entropy encoding */

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struct jpeg_entropy_encoder {

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void (*start_pass) (j_compress_ptr cinfo, boolean gather_statistics);

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boolean (*encode_mcu) (j_compress_ptr cinfo, JBLOCKROW *MCU_data);

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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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void (*write_file_header) (j_compress_ptr cinfo);

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void (*write_frame_header) (j_compress_ptr cinfo);

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void (*write_scan_header) (j_compress_ptr cinfo);

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void (*write_file_trailer) (j_compress_ptr cinfo);

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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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void (*write_marker_header) (j_compress_ptr cinfo, int marker,

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unsigned int datalen);

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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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void (*prepare_for_output_pass) (j_decompress_ptr cinfo);

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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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/* Partial decompression variables */

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JDIMENSION first_iMCU_col;

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JDIMENSION last_iMCU_col;

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JDIMENSION first_MCU_col[MAX_COMPONENTS];

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JDIMENSION last_MCU_col[MAX_COMPONENTS];

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boolean jinit_upsampler_no_alloc;

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};

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/* Input control module */

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struct jpeg_input_controller {

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int (*consume_input) (j_decompress_ptr cinfo);

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void (*reset_input_controller) (j_decompress_ptr cinfo);

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void (*start_input_pass) (j_decompress_ptr cinfo);

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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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void (*start_pass) (j_decompress_ptr cinfo, J_BUF_MODE pass_mode);

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void (*process_data) (j_decompress_ptr cinfo, JSAMPARRAY output_buf,

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JDIMENSION *out_row_ctr, 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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void (*start_input_pass) (j_decompress_ptr cinfo);

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int (*consume_data) (j_decompress_ptr cinfo);

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void (*start_output_pass) (j_decompress_ptr cinfo);

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int (*decompress_data) (j_decompress_ptr cinfo, 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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void (*start_pass) (j_decompress_ptr cinfo, J_BUF_MODE pass_mode);

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void (*post_process_data) (j_decompress_ptr cinfo, 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, 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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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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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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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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void (*start_pass) (j_decompress_ptr cinfo);

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boolean (*decode_mcu) (j_decompress_ptr cinfo, 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 void (*inverse_DCT_method_ptr) (j_decompress_ptr cinfo,

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jpeg_component_info *compptr,

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JCOEFPTR coef_block,

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JSAMPARRAY output_buf,

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JDIMENSION output_col);

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struct jpeg_inverse_dct {

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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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void (*start_pass) (j_decompress_ptr cinfo);

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void (*upsample) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,

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JDIMENSION *in_row_group_ctr,

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JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,

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JDIMENSION *out_row_ctr, 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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void (*start_pass) (j_decompress_ptr cinfo);

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void (*color_convert) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,

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JDIMENSION input_row, JSAMPARRAY output_buf,

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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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void (*start_pass) (j_decompress_ptr cinfo, boolean is_pre_scan);

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void (*color_quantize) (j_decompress_ptr cinfo, JSAMPARRAY input_buf,

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JSAMPARRAY output_buf, int num_rows);

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void (*finish_pass) (j_decompress_ptr cinfo);

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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 a JLONG 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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#ifdef RIGHT_SHIFT_IS_UNSIGNED

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#define SHIFT_TEMPS JLONG 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)) | ((~((JLONG) 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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/* Compression module initialization routines */

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EXTERN(void) jinit_compress_master (j_compress_ptr cinfo);

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EXTERN(void) jinit_c_master_control (j_compress_ptr cinfo,

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boolean transcode_only);

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EXTERN(void) jinit_c_main_controller (j_compress_ptr cinfo,

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boolean need_full_buffer);

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EXTERN(void) jinit_c_prep_controller (j_compress_ptr cinfo,

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boolean need_full_buffer);

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EXTERN(void) jinit_c_coef_controller (j_compress_ptr cinfo,

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boolean need_full_buffer);

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EXTERN(void) jinit_color_converter (j_compress_ptr cinfo);

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EXTERN(void) jinit_downsampler (j_compress_ptr cinfo);

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EXTERN(void) jinit_forward_dct (j_compress_ptr cinfo);

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EXTERN(void) jinit_huff_encoder (j_compress_ptr cinfo);

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EXTERN(void) jinit_phuff_encoder (j_compress_ptr cinfo);

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EXTERN(void) jinit_arith_encoder (j_compress_ptr cinfo);

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EXTERN(void) jinit_marker_writer (j_compress_ptr cinfo);

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/* Decompression module initialization routines */

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EXTERN(void) jinit_master_decompress (j_decompress_ptr cinfo);

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EXTERN(void) jinit_d_main_controller (j_decompress_ptr cinfo,

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boolean need_full_buffer);

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EXTERN(void) jinit_d_coef_controller (j_decompress_ptr cinfo,

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boolean need_full_buffer);

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EXTERN(void) jinit_d_post_controller (j_decompress_ptr cinfo,

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boolean need_full_buffer);

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EXTERN(void) jinit_input_controller (j_decompress_ptr cinfo);

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EXTERN(void) jinit_marker_reader (j_decompress_ptr cinfo);

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EXTERN(void) jinit_huff_decoder (j_decompress_ptr cinfo);

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EXTERN(void) jinit_phuff_decoder (j_decompress_ptr cinfo);

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EXTERN(void) jinit_arith_decoder (j_decompress_ptr cinfo);

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EXTERN(void) jinit_inverse_dct (j_decompress_ptr cinfo);

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EXTERN(void) jinit_upsampler (j_decompress_ptr cinfo);

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EXTERN(void) jinit_color_deconverter (j_decompress_ptr cinfo);

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EXTERN(void) jinit_1pass_quantizer (j_decompress_ptr cinfo);

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EXTERN(void) jinit_2pass_quantizer (j_decompress_ptr cinfo);

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EXTERN(void) jinit_merged_upsampler (j_decompress_ptr cinfo);

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/* Memory manager initialization */

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EXTERN(void) jinit_memory_mgr (j_common_ptr cinfo);

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/* Utility routines in jutils.c */

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EXTERN(long) jdiv_round_up (long a, long b);

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EXTERN(long) jround_up (long a, long b);

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EXTERN(void) jcopy_sample_rows (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 (JBLOCKROW input_row, JBLOCKROW output_row,

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JDIMENSION num_blocks);

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EXTERN(void) jzero_far (void *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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/* Arithmetic coding probability estimation tables in jaricom.c */

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extern const JLONG 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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