www.pudn.com > imgport.rar > jpegint.h, change:2008-11-05,size:16373b

 * 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 */ 
/* 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)); 
  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: 
  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. 
#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))) 
#define SHIFT_TEMPS 
#define RIGHT_SHIFT(x,shft)	((x) >> (shft)) 
/* Short forms of external names for systems with brain-damaged linkers. */ 
#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 
/* 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 */ 
extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */ 
/* Suppress undefined-structure complaints if necessary. */ 
#ifndef AM_MEMORY_MANAGER	/* only jmemmgr.c defines these */ 
struct jvirt_sarray_control { long dummy; }; 
struct jvirt_barray_control { long dummy; };