src/jpeg/jpegint.h

/*
 * 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 {
#if defined(__VISAGECPP__)
  /* the start input pass in jdcoeft must have a different name than the
  // one in jdtrans under VisualAge or else we get a dup symbol error
  */
  JMETHOD(void, start_input_pass2, (j_decompress_ptr cinfo));
#else
  JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
#endif

  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	JPEG_INT32 shift_temp;
#define RIGHT_SHIFT(x,shft)  \
	((shift_temp = (x)) < 0 ? \
	 (shift_temp >> (shft)) | ((~((JPEG_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 */
Commit	Line	Data
	1	/*
	2	* jpegint.h
	3	*
	4	* Copyright (C) 1991-1997, Thomas G. Lane.
	5	* This file is part of the Independent JPEG Group's software.
	6	* For conditions of distribution and use, see the accompanying README file.
	7	*
	8	* This file provides common declarations for the various JPEG modules.
	9	* These declarations are considered internal to the JPEG library; most
	10	* applications using the library shouldn't need to include this file.
	11	*/
	12
	13
	14	/* Declarations for both compression & decompression */
	15
	16	typedef enum { /* Operating modes for buffer controllers */
	17	JBUF_PASS_THRU, /* Plain stripwise operation */
	18	/* Remaining modes require a full-image buffer to have been created */
	19	JBUF_SAVE_SOURCE, /* Run source subobject only, save output */
	20	JBUF_CRANK_DEST, /* Run dest subobject only, using saved data */
	21	JBUF_SAVE_AND_PASS /* Run both subobjects, save output */
	22	} J_BUF_MODE;
	23
	24	/* Values of global_state field (jdapi.c has some dependencies on ordering!) */
	25	#define CSTATE_START 100 /* after create_compress */
	26	#define CSTATE_SCANNING 101 /* start_compress done, write_scanlines OK */
	27	#define CSTATE_RAW_OK 102 /* start_compress done, write_raw_data OK */
	28	#define CSTATE_WRCOEFS 103 /* jpeg_write_coefficients done */
	29	#define DSTATE_START 200 /* after create_decompress */
	30	#define DSTATE_INHEADER 201 /* reading header markers, no SOS yet */
	31	#define DSTATE_READY 202 /* found SOS, ready for start_decompress */
	32	#define DSTATE_PRELOAD 203 /* reading multiscan file in start_decompress*/
	33	#define DSTATE_PRESCAN 204 /* performing dummy pass for 2-pass quant */
	34	#define DSTATE_SCANNING 205 /* start_decompress done, read_scanlines OK */
	35	#define DSTATE_RAW_OK 206 /* start_decompress done, read_raw_data OK */
	36	#define DSTATE_BUFIMAGE 207 /* expecting jpeg_start_output */
	37	#define DSTATE_BUFPOST 208 /* looking for SOS/EOI in jpeg_finish_output */
	38	#define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */
	39	#define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */
	40
	41
	42	/* Declarations for compression modules */
	43
	44	/* Master control module */
	45	struct jpeg_comp_master {
	46	JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));
	47	JMETHOD(void, pass_startup, (j_compress_ptr cinfo));
	48	JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
	49
	50	/* State variables made visible to other modules */
	51	boolean call_pass_startup; /* True if pass_startup must be called */
	52	boolean is_last_pass; /* True during last pass */
	53	};
	54
	55	/* Main buffer control (downsampled-data buffer) */
	56	struct jpeg_c_main_controller {
	57	JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
	58	JMETHOD(void, process_data, (j_compress_ptr cinfo,
	59	JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
	60	JDIMENSION in_rows_avail));
	61	};
	62
	63	/* Compression preprocessing (downsampling input buffer control) */
	64	struct jpeg_c_prep_controller {
	65	JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
	66	JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,
	67	JSAMPARRAY input_buf,
	68	JDIMENSION *in_row_ctr,
	69	JDIMENSION in_rows_avail,
	70	JSAMPIMAGE output_buf,
	71	JDIMENSION *out_row_group_ctr,
	72	JDIMENSION out_row_groups_avail));
	73	};
	74
	75	/* Coefficient buffer control */
	76	struct jpeg_c_coef_controller {
	77	JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
	78	JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,
	79	JSAMPIMAGE input_buf));
	80	};
	81
	82	/* Colorspace conversion */
	83	struct jpeg_color_converter {
	84	JMETHOD(void, start_pass, (j_compress_ptr cinfo));
	85	JMETHOD(void, color_convert, (j_compress_ptr cinfo,
	86	JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
	87	JDIMENSION output_row, int num_rows));
	88	};
	89
	90	/* Downsampling */
	91	struct jpeg_downsampler {
	92	JMETHOD(void, start_pass, (j_compress_ptr cinfo));
	93	JMETHOD(void, downsample, (j_compress_ptr cinfo,
	94	JSAMPIMAGE input_buf, JDIMENSION in_row_index,
	95	JSAMPIMAGE output_buf,
	96	JDIMENSION out_row_group_index));
	97
	98	boolean need_context_rows; /* TRUE if need rows above & below */
	99	};
	100
	101	/* Forward DCT (also controls coefficient quantization) */
	102	struct jpeg_forward_dct {
	103	JMETHOD(void, start_pass, (j_compress_ptr cinfo));
	104	/* perhaps this should be an array??? */
	105	JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,
	106	jpeg_component_info * compptr,
	107	JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
	108	JDIMENSION start_row, JDIMENSION start_col,
	109	JDIMENSION num_blocks));
	110	};
	111
	112	/* Entropy encoding */
	113	struct jpeg_entropy_encoder {
	114	JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));
	115	JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data));
	116	JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
	117	};
	118
	119	/* Marker writing */
	120	struct jpeg_marker_writer {
	121	JMETHOD(void, write_file_header, (j_compress_ptr cinfo));
	122	JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));
	123	JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));
	124	JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));
	125	JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));
	126	/* These routines are exported to allow insertion of extra markers */
	127	/* Probably only COM and APPn markers should be written this way */
	128	JMETHOD(void, write_marker_header, (j_compress_ptr cinfo, int marker,
	129	unsigned int datalen));
	130	JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val));
	131	};
	132
	133
	134	/* Declarations for decompression modules */
	135
	136	/* Master control module */
	137	struct jpeg_decomp_master {
	138	JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));
	139	JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));
	140
	141	/* State variables made visible to other modules */
	142	boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */
	143	};
	144
	145	/* Input control module */
	146	struct jpeg_input_controller {
	147	JMETHOD(int, consume_input, (j_decompress_ptr cinfo));
	148	JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));
	149	JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
	150	JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));
	151
	152	/* State variables made visible to other modules */
	153	boolean has_multiple_scans; /* True if file has multiple scans */
	154	boolean eoi_reached; /* True when EOI has been consumed */
	155	};
	156
	157	/* Main buffer control (downsampled-data buffer) */
	158	struct jpeg_d_main_controller {
	159	JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
	160	JMETHOD(void, process_data, (j_decompress_ptr cinfo,
	161	JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
	162	JDIMENSION out_rows_avail));
	163	};
	164
	165	/* Coefficient buffer control */
	166	struct jpeg_d_coef_controller {
	167	#if defined(__VISAGECPP__)
	168	/* the start input pass in jdcoeft must have a different name than the
	169	// one in jdtrans under VisualAge or else we get a dup symbol error
	170	*/
	171	JMETHOD(void, start_input_pass2, (j_decompress_ptr cinfo));
	172	#else
	173	JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
	174	#endif
	175
	176	JMETHOD(int, consume_data, (j_decompress_ptr cinfo));
	177	JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));
	178	JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,
	179	JSAMPIMAGE output_buf));
	180	/* Pointer to array of coefficient virtual arrays, or NULL if none */
	181	jvirt_barray_ptr *coef_arrays;
	182	};
	183
	184	/* Decompression postprocessing (color quantization buffer control) */
	185	struct jpeg_d_post_controller {
	186	JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
	187	JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
	188	JSAMPIMAGE input_buf,
	189	JDIMENSION *in_row_group_ctr,
	190	JDIMENSION in_row_groups_avail,
	191	JSAMPARRAY output_buf,
	192	JDIMENSION *out_row_ctr,
	193	JDIMENSION out_rows_avail));
	194	};
	195
	196	/* Marker reading & parsing */
	197	struct jpeg_marker_reader {
	198	JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));
	199	/* Read markers until SOS or EOI.
	200	* Returns same codes as are defined for jpeg_consume_input:
	201	* JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
	202	*/
	203	JMETHOD(int, read_markers, (j_decompress_ptr cinfo));
	204	/* Read a restart marker --- exported for use by entropy decoder only */
	205	jpeg_marker_parser_method read_restart_marker;
	206
	207	/* State of marker reader --- nominally internal, but applications
	208	* supplying COM or APPn handlers might like to know the state.
	209	*/
	210	boolean saw_SOI; /* found SOI? */
	211	boolean saw_SOF; /* found SOF? */
	212	int next_restart_num; /* next restart number expected (0-7) */
	213	unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */
	214	};
	215
	216	/* Entropy decoding */
	217	struct jpeg_entropy_decoder {
	218	JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
	219	JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,
	220	JBLOCKROW *MCU_data));
	221
	222	/* This is here to share code between baseline and progressive decoders; */
	223	/* other modules probably should not use it */
	224	boolean insufficient_data; /* set TRUE after emitting warning */
	225	};
	226
	227	/* Inverse DCT (also performs dequantization) */
	228	typedef JMETHOD(void, inverse_DCT_method_ptr,
	229	(j_decompress_ptr cinfo, jpeg_component_info * compptr,
	230	JCOEFPTR coef_block,
	231	JSAMPARRAY output_buf, JDIMENSION output_col));
	232
	233	struct jpeg_inverse_dct {
	234	JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
	235	/* It is useful to allow each component to have a separate IDCT method. */
	236	inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
	237	};
	238
	239	/* Upsampling (note that upsampler must also call color converter) */
	240	struct jpeg_upsampler {
	241	JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
	242	JMETHOD(void, upsample, (j_decompress_ptr cinfo,
	243	JSAMPIMAGE input_buf,
	244	JDIMENSION *in_row_group_ctr,
	245	JDIMENSION in_row_groups_avail,
	246	JSAMPARRAY output_buf,
	247	JDIMENSION *out_row_ctr,
	248	JDIMENSION out_rows_avail));
	249
	250	boolean need_context_rows; /* TRUE if need rows above & below */
	251	};
	252
	253	/* Colorspace conversion */
	254	struct jpeg_color_deconverter {
	255	JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
	256	JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
	257	JSAMPIMAGE input_buf, JDIMENSION input_row,
	258	JSAMPARRAY output_buf, int num_rows));
	259	};
	260
	261	/* Color quantization or color precision reduction */
	262	struct jpeg_color_quantizer {
	263	JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
	264	JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
	265	JSAMPARRAY input_buf, JSAMPARRAY output_buf,
	266	int num_rows));
	267	JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
	268	JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
	269	};
	270
	271
	272	/* Miscellaneous useful macros */
	273
	274	#undef MAX
	275	#define MAX(a,b) ((a) > (b) ? (a) : (b))
	276	#undef MIN
	277	#define MIN(a,b) ((a) < (b) ? (a) : (b))
	278
	279
	280	/* We assume that right shift corresponds to signed division by 2 with
	281	* rounding towards minus infinity. This is correct for typical "arithmetic
	282	* shift" instructions that shift in copies of the sign bit. But some
	283	* C compilers implement >> with an unsigned shift. For these machines you
	284	* must define RIGHT_SHIFT_IS_UNSIGNED.
	285	* RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.
	286	* It is only applied with constant shift counts. SHIFT_TEMPS must be
	287	* included in the variables of any routine using RIGHT_SHIFT.
	288	*/
	289
	290	#ifdef RIGHT_SHIFT_IS_UNSIGNED
	291	#define SHIFT_TEMPS JPEG_INT32 shift_temp;
	292	#define RIGHT_SHIFT(x,shft) \
	293	((shift_temp = (x)) < 0 ? \
	294	(shift_temp >> (shft)) \| ((~((JPEG_INT32) 0)) << (32-(shft))) : \
	295	(shift_temp >> (shft)))
	296	#else
	297	#define SHIFT_TEMPS
	298	#define RIGHT_SHIFT(x,shft) ((x) >> (shft))
	299	#endif
	300
	301
	302	/* Short forms of external names for systems with brain-damaged linkers. */
	303
	304	#ifdef NEED_SHORT_EXTERNAL_NAMES
	305	#define jinit_compress_master jICompress
	306	#define jinit_c_master_control jICMaster
	307	#define jinit_c_main_controller jICMainC
	308	#define jinit_c_prep_controller jICPrepC
	309	#define jinit_c_coef_controller jICCoefC
	310	#define jinit_color_converter jICColor
	311	#define jinit_downsampler jIDownsampler
	312	#define jinit_forward_dct jIFDCT
	313	#define jinit_huff_encoder jIHEncoder
	314	#define jinit_phuff_encoder jIPHEncoder
	315	#define jinit_marker_writer jIMWriter
	316	#define jinit_master_decompress jIDMaster
	317	#define jinit_d_main_controller jIDMainC
	318	#define jinit_d_coef_controller jIDCoefC
	319	#define jinit_d_post_controller jIDPostC
	320	#define jinit_input_controller jIInCtlr
	321	#define jinit_marker_reader jIMReader
	322	#define jinit_huff_decoder jIHDecoder
	323	#define jinit_phuff_decoder jIPHDecoder
	324	#define jinit_inverse_dct jIIDCT
	325	#define jinit_upsampler jIUpsampler
	326	#define jinit_color_deconverter jIDColor
	327	#define jinit_1pass_quantizer jI1Quant
	328	#define jinit_2pass_quantizer jI2Quant
	329	#define jinit_merged_upsampler jIMUpsampler
	330	#define jinit_memory_mgr jIMemMgr
	331	#define jdiv_round_up jDivRound
	332	#define jround_up jRound
	333	#define jcopy_sample_rows jCopySamples
	334	#define jcopy_block_row jCopyBlocks
	335	#define jzero_far jZeroFar
	336	#define jpeg_zigzag_order jZIGTable
	337	#define jpeg_natural_order jZAGTable
	338	#endif /* NEED_SHORT_EXTERNAL_NAMES */
	339
	340
	341	/* Compression module initialization routines */
	342	EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo));
	343	EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo,
	344	boolean transcode_only));
	345	EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo,
	346	boolean need_full_buffer));
	347	EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo,
	348	boolean need_full_buffer));
	349	EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,
	350	boolean need_full_buffer));
	351	EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));
	352	EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));
	353	EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
	354	EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));
	355	EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo));
	356	EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));
	357	/* Decompression module initialization routines */
	358	EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));
	359	EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo,
	360	boolean need_full_buffer));
	361	EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
	362	boolean need_full_buffer));
	363	EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,
	364	boolean need_full_buffer));
	365	EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));
	366	EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));
	367	EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));
	368	EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
	369	EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
	370	EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));
	371	EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));
	372	EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));
	373	EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));
	374	EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo));
	375	/* Memory manager initialization */
	376	EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo));
	377
	378	/* Utility routines in jutils.c */
	379	EXTERN(long) jdiv_round_up JPP((long a, long b));
	380	EXTERN(long) jround_up JPP((long a, long b));
	381	EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,
	382	JSAMPARRAY output_array, int dest_row,
	383	int num_rows, JDIMENSION num_cols));
	384	EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,
	385	JDIMENSION num_blocks));
	386	EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
	387	/* Constant tables in jutils.c */
	388	#if 0 /* This table is not actually needed in v6a */
	389	extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
	390	#endif
	391	extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
	392
	393	/* Suppress undefined-structure complaints if necessary. */
	394
	395	#ifdef INCOMPLETE_TYPES_BROKEN
	396	#ifndef AM_MEMORY_MANAGER /* only jmemmgr.c defines these */
	397	struct jvirt_sarray_control { long dummy; };
	398	struct jvirt_barray_control { long dummy; };
	399	#endif
	400	#endif /* INCOMPLETE_TYPES_BROKEN */