/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * jpegint.h

 *

 * Copyright (C) 1991-1997, Thomas G. Lane.

 * This file is part of the Independent JPEG Group's software.

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

 *

 * This file provides common declarations for the various JPEG modules.

 * These declarations are considered internal to the JPEG library; most

 * applications using the library shouldn't need to include this file.

 */

/* Declarations for both compression & decompression */

typedef enum {                  /* Operating modes for buffer controllers */

        JBUF_PASS_THRU,         /* Plain stripwise operation */

        /* Remaining modes require a full-image buffer to have been created */

        JBUF_SAVE_SOURCE,       /* Run source subobject only, save output */

        JBUF_CRANK_DEST,        /* Run dest subobject only, using saved data */

        JBUF_SAVE_AND_PASS      /* Run both subobjects, save output */

} J_BUF_MODE;

/* Values of global_state field (jdapi.c has some dependencies on ordering!) */

#define CSTATE_START    100     /* after create_compress */

#define CSTATE_SCANNING 101     /* start_compress done, write_scanlines OK */

#define CSTATE_RAW_OK   102     /* start_compress done, write_raw_data OK */

#define CSTATE_WRCOEFS  103     /* jpeg_write_coefficients done */

#define DSTATE_START    200     /* after create_decompress */

#define DSTATE_INHEADER 201     /* reading header markers, no SOS yet */

#define DSTATE_READY    202     /* found SOS, ready for start_decompress */

#define DSTATE_PRELOAD  203     /* reading multiscan file in start_decompress*/

#define DSTATE_PRESCAN  204     /* performing dummy pass for 2-pass quant */

#define DSTATE_SCANNING 205     /* start_decompress done, read_scanlines OK */

#define DSTATE_RAW_OK   206     /* start_decompress done, read_raw_data OK */

#define DSTATE_BUFIMAGE 207     /* expecting jpeg_start_output */

#define DSTATE_BUFPOST  208     /* looking for SOS/EOI in jpeg_finish_output */

#define DSTATE_RDCOEFS  209     /* reading file in jpeg_read_coefficients */

#define DSTATE_STOPPING 210     /* looking for EOI in jpeg_finish_decompress */

/* Declarations for compression modules */

/* Master control module */

struct jpeg_comp_master {

  JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));

  JMETHOD(void, pass_startup, (j_compress_ptr cinfo));

  JMETHOD(void, finish_pass, (j_compress_ptr cinfo));

  /* State variables made visible to other modules */

  boolean call_pass_startup;    /* True if pass_startup must be called */

  boolean is_last_pass;         /* True during last pass */

};

/* Main buffer control (downsampled-data buffer) */

struct jpeg_c_main_controller {

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

  JMETHOD(void, process_data, (j_compress_ptr cinfo,

                               JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,

                               JDIMENSION in_rows_avail));

};

/* Compression preprocessing (downsampling input buffer control) */

struct jpeg_c_prep_controller {

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

  JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,

                                   JSAMPARRAY input_buf,

                                   JDIMENSION *in_row_ctr,

                                   JDIMENSION in_rows_avail,

                                   JSAMPIMAGE output_buf,

                                   JDIMENSION *out_row_group_ctr,

                                   JDIMENSION out_row_groups_avail));

};

/* Coefficient buffer control */

struct jpeg_c_coef_controller {

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

  JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,

                                   JSAMPIMAGE input_buf));

};

/* Colorspace conversion */

struct jpeg_color_converter {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo));

  JMETHOD(void, color_convert, (j_compress_ptr cinfo,

                                JSAMPARRAY input_buf, JSAMPIMAGE output_buf,

                                JDIMENSION output_row, int num_rows));

};

/* Downsampling */

struct jpeg_downsampler {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo));

  JMETHOD(void, downsample, (j_compress_ptr cinfo,

                             JSAMPIMAGE input_buf, JDIMENSION in_row_index,

                             JSAMPIMAGE output_buf,

                             JDIMENSION out_row_group_index));

  boolean need_context_rows;    /* TRUE if need rows above & below */

};

/* Forward DCT (also controls coefficient quantization) */

struct jpeg_forward_dct {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo));

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

  JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,

                              jpeg_component_info * compptr,

                              JSAMPARRAY sample_data, JBLOCKROW coef_blocks,

                              JDIMENSION start_row, JDIMENSION start_col,

                              JDIMENSION num_blocks));

};

/* Entropy encoding */

struct jpeg_entropy_encoder {

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

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

  JMETHOD(void, finish_pass, (j_compress_ptr cinfo));

};

/* Marker writing */

struct jpeg_marker_writer {

  JMETHOD(void, write_file_header, (j_compress_ptr cinfo));

  JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));

  JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));

  JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));

  JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));

  /* These routines are exported to allow insertion of extra markers */

  /* Probably only COM and APPn markers should be written this way */

  JMETHOD(void, write_marker_header, (j_compress_ptr cinfo, int marker,

                                      unsigned int datalen));

  JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val));

};

/* Declarations for decompression modules */

/* Master control module */

struct jpeg_decomp_master {

  JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));

  /* State variables made visible to other modules */

  boolean is_dummy_pass;        /* True during 1st pass for 2-pass quant */

};

/* Input control module */

struct jpeg_input_controller {

  JMETHOD(int, consume_input, (j_decompress_ptr cinfo));

  JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));

  JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));

  /* State variables made visible to other modules */

  boolean has_multiple_scans;   /* True if file has multiple scans */

  boolean eoi_reached;          /* True when EOI has been consumed */

};

/* Main buffer control (downsampled-data buffer) */

struct jpeg_d_main_controller {

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

  JMETHOD(void, process_data, (j_decompress_ptr cinfo,

                               JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,

                               JDIMENSION out_rows_avail));

};

/* Coefficient buffer control */

struct jpeg_d_coef_controller {

  JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));

  JMETHOD(int, consume_data, (j_decompress_ptr cinfo));

  JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));

  JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,

                                 JSAMPIMAGE output_buf));

  /* Pointer to array of coefficient virtual arrays, or NULL if none */

  jvirt_barray_ptr *coef_arrays;

};

/* Decompression postprocessing (color quantization buffer control) */

struct jpeg_d_post_controller {

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

  JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,

                                    JSAMPIMAGE input_buf,

                                    JDIMENSION *in_row_group_ctr,

                                    JDIMENSION in_row_groups_avail,

                                    JSAMPARRAY output_buf,

                                    JDIMENSION *out_row_ctr,

                                    JDIMENSION out_rows_avail));

};

/* Marker reading & parsing */

struct jpeg_marker_reader {

  JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));

  /* Read markers until SOS or EOI.

   * Returns same codes as are defined for jpeg_consume_input:

   * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.

   */

  JMETHOD(int, read_markers, (j_decompress_ptr cinfo));

  /* Read a restart marker --- exported for use by entropy decoder only */

  jpeg_marker_parser_method read_restart_marker;

  /* State of marker reader --- nominally internal, but applications

   * supplying COM or APPn handlers might like to know the state.

   */

  boolean saw_SOI;              /* found SOI? */

  boolean saw_SOF;              /* found SOF? */

  int next_restart_num;         /* next restart number expected (0-7) */

  unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */

};

/* Entropy decoding */

struct jpeg_entropy_decoder {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));

  JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,

                                JBLOCKROW *MCU_data));

  /* This is here to share code between baseline and progressive decoders; */

  /* other modules probably should not use it */

  boolean insufficient_data;    /* set TRUE after emitting warning */

};

/* Inverse DCT (also performs dequantization) */

typedef JMETHOD(void, inverse_DCT_method_ptr,

                (j_decompress_ptr cinfo, jpeg_component_info * compptr,

                 JCOEFPTR coef_block,

                 JSAMPARRAY output_buf, JDIMENSION output_col));

struct jpeg_inverse_dct {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));

  /* It is useful to allow each component to have a separate IDCT method. */

  inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];

};

/* Upsampling (note that upsampler must also call color converter) */

struct jpeg_upsampler {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, upsample, (j_decompress_ptr cinfo,

                           JSAMPIMAGE input_buf,

                           JDIMENSION *in_row_group_ctr,

                           JDIMENSION in_row_groups_avail,

                           JSAMPARRAY output_buf,

                           JDIMENSION *out_row_ctr,

                           JDIMENSION out_rows_avail));

  boolean need_context_rows;    /* TRUE if need rows above & below */

};

/* Colorspace conversion */

struct jpeg_color_deconverter {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, color_convert, (j_decompress_ptr cinfo,

                                JSAMPIMAGE input_buf, JDIMENSION input_row,

                                JSAMPARRAY output_buf, int num_rows));

};

/* Color quantization or color precision reduction */

struct jpeg_color_quantizer {

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

  JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,

                                 JSAMPARRAY input_buf, JSAMPARRAY output_buf,

                                 int num_rows));

  JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));

};

/* Miscellaneous useful macros */

#undef MAX

#define MAX(a,b)        ((a) > (b) ? (a) : (b))

#undef MIN

#define MIN(a,b)        ((a) < (b) ? (a) : (b))

/* We assume that right shift corresponds to signed division by 2 with

 * rounding towards minus infinity.  This is correct for typical "arithmetic

 * shift" instructions that shift in copies of the sign bit.  But some

 * C compilers implement >> with an unsigned shift.  For these machines you

 * must define RIGHT_SHIFT_IS_UNSIGNED.

 * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.

 * It is only applied with constant shift counts.  SHIFT_TEMPS must be

 * included in the variables of any routine using RIGHT_SHIFT.

 */

#ifdef RIGHT_SHIFT_IS_UNSIGNED

#define SHIFT_TEMPS     INT32 shift_temp;

#define RIGHT_SHIFT(x,shft)  \

        ((shift_temp = (x)) < 0 ? \

         (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \

         (shift_temp >> (shft)))

#else

#define SHIFT_TEMPS

#define RIGHT_SHIFT(x,shft)     ((x) >> (shft))

#endif

/* Short forms of external names for systems with brain-damaged linkers. */

#ifdef NEED_SHORT_EXTERNAL_NAMES

#define jinit_compress_master   jICompress

#define jinit_c_master_control  jICMaster

#define jinit_c_main_controller jICMainC

#define jinit_c_prep_controller jICPrepC

#define jinit_c_coef_controller jICCoefC

#define jinit_color_converter   jICColor

#define jinit_downsampler       jIDownsampler

#define jinit_forward_dct       jIFDCT

#define jinit_huff_encoder      jIHEncoder

#define jinit_phuff_encoder     jIPHEncoder

#define jinit_marker_writer     jIMWriter

#define jinit_master_decompress jIDMaster

#define jinit_d_main_controller jIDMainC

#define jinit_d_coef_controller jIDCoefC

#define jinit_d_post_controller jIDPostC

#define jinit_input_controller  jIInCtlr

#define jinit_marker_reader     jIMReader

#define jinit_huff_decoder      jIHDecoder

#define jinit_phuff_decoder     jIPHDecoder

#define jinit_inverse_dct       jIIDCT

#define jinit_upsampler         jIUpsampler

#define jinit_color_deconverter jIDColor

#define jinit_1pass_quantizer   jI1Quant

#define jinit_2pass_quantizer   jI2Quant

#define jinit_merged_upsampler  jIMUpsampler

#define jinit_memory_mgr        jIMemMgr

#define jdiv_round_up           jDivRound

#define jround_up               jRound

#define jcopy_sample_rows       jCopySamples

#define jcopy_block_row         jCopyBlocks

#define jzero_far               jZeroFar

#define jpeg_zigzag_order       jZIGTable

#define jpeg_natural_order      jZAGTable

#endif /* NEED_SHORT_EXTERNAL_NAMES */

/* Compression module initialization routines */

EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo));

EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo,

                                         boolean transcode_only));

EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo,

                                          boolean need_full_buffer));

EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo,

                                          boolean need_full_buffer));

EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,

                                          boolean need_full_buffer));

EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));

EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));

EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));

EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));

EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo));

EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));

/* Decompression module initialization routines */

EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo,

                                          boolean need_full_buffer));

EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,

                                          boolean need_full_buffer));

EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,

                                          boolean need_full_buffer));

EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));

EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo));

/* Memory manager initialization */

EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo));

/* Utility routines in jutils.c */

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

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

EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,

                                    JSAMPARRAY output_array, int dest_row,

                                    int num_rows, JDIMENSION num_cols));

EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,

                                  JDIMENSION num_blocks));

EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));

/* Constant tables in jutils.c */

#if 0                           /* This table is not actually needed in v6a */

extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */

#endif

extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */

/* Suppress undefined-structure complaints if necessary. */

#ifdef INCOMPLETE_TYPES_BROKEN

#ifndef AM_MEMORY_MANAGER       /* only jmemmgr.c defines these */

struct jvirt_sarray_control { long dummy; };

struct jvirt_barray_control { long dummy; };

#endif

#endif /* INCOMPLETE_TYPES_BROKEN */