www.pudn.com > imgport.rar > cdjpeg.h, change:2008-11-05,size:6307b


/* 
 * cdjpeg.h 
 * 
 * Copyright (C) 1994-1997, 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 contains common declarations for the sample applications 
 * cjpeg and djpeg.  It is NOT used by the core JPEG library. 
 */ 
 
#define JPEG_CJPEG_DJPEG	/* define proper options in jconfig.h */ 
#define JPEG_INTERNAL_OPTIONS	/* cjpeg.c,djpeg.c need to see xxx_SUPPORTED */ 
#include "jinclude.h" 
#include "jpeglib.h" 
#include "jerror.h"		/* get library error codes too */ 
#include "cderror.h"		/* get application-specific error codes */ 
 
 
/* 
 * Object interface for cjpeg's source file decoding modules 
 */ 
 
typedef struct cjpeg_source_struct * cjpeg_source_ptr; 
 
struct cjpeg_source_struct { 
  JMETHOD(void, start_input, (j_compress_ptr cinfo, 
			      cjpeg_source_ptr sinfo)); 
  JMETHOD(JDIMENSION, get_pixel_rows, (j_compress_ptr cinfo, 
				       cjpeg_source_ptr sinfo)); 
  JMETHOD(void, finish_input, (j_compress_ptr cinfo, 
			       cjpeg_source_ptr sinfo)); 
 
  FILE *input_file; 
 
  JSAMPARRAY buffer; 
  JDIMENSION buffer_height; 
}; 
 
 
/* 
 * Object interface for djpeg's output file encoding modules 
 */ 
 
typedef struct djpeg_dest_struct * djpeg_dest_ptr; 
 
struct djpeg_dest_struct { 
  /* start_output is called after jpeg_start_decompress finishes. 
   * The color map will be ready at this time, if one is needed. 
   */ 
  JMETHOD(void, start_output, (j_decompress_ptr cinfo, 
			       djpeg_dest_ptr dinfo)); 
  /* Emit the specified number of pixel rows from the buffer. */ 
  JMETHOD(void, put_pixel_rows, (j_decompress_ptr cinfo, 
				 djpeg_dest_ptr dinfo, 
				 JDIMENSION rows_supplied)); 
  /* Finish up at the end of the image. */ 
  JMETHOD(void, finish_output, (j_decompress_ptr cinfo, 
				djpeg_dest_ptr dinfo)); 
 
  /* Target file spec; filled in by djpeg.c after object is created. */ 
  FILE * output_file; 
 
  /* Output pixel-row buffer.  Created by module init or start_output. 
   * Width is cinfo->output_width * cinfo->output_components; 
   * height is buffer_height. 
   */ 
  JSAMPARRAY buffer; 
  JDIMENSION buffer_height; 
}; 
 
 
/* 
 * cjpeg/djpeg may need to perform extra passes to convert to or from 
 * the source/destination file format.  The JPEG library does not know 
 * about these passes, but we'd like them to be counted by the progress 
 * monitor.  We use an expanded progress monitor object to hold the 
 * additional pass count. 
 */ 
 
struct cdjpeg_progress_mgr { 
  struct jpeg_progress_mgr pub;	/* fields known to JPEG library */ 
  int completed_extra_passes;	/* extra passes completed */ 
  int total_extra_passes;	/* total extra */ 
  /* last printed percentage stored here to avoid multiple printouts */ 
  int percent_done; 
}; 
 
typedef struct cdjpeg_progress_mgr * cd_progress_ptr; 
 
 
/* Short forms of external names for systems with brain-damaged linkers. */ 
 
#ifdef NEED_SHORT_EXTERNAL_NAMES 
#define jinit_read_bmp		jIRdBMP 
#define jinit_write_bmp		jIWrBMP 
#define jinit_read_gif		jIRdGIF 
#define jinit_write_gif		jIWrGIF 
#define jinit_read_ppm		jIRdPPM 
#define jinit_write_ppm		jIWrPPM 
#define jinit_read_rle		jIRdRLE 
#define jinit_write_rle		jIWrRLE 
#define jinit_read_targa	jIRdTarga 
#define jinit_write_targa	jIWrTarga 
#define read_quant_tables	RdQTables 
#define read_scan_script	RdScnScript 
#define set_quant_slots		SetQSlots 
#define set_sample_factors	SetSFacts 
#define read_color_map		RdCMap 
#define enable_signal_catcher	EnSigCatcher 
#define start_progress_monitor	StProgMon 
#define end_progress_monitor	EnProgMon 
#define read_stdin		RdStdin 
#define write_stdout		WrStdout 
#endif /* NEED_SHORT_EXTERNAL_NAMES */ 
 
/* Module selection routines for I/O modules. */ 
 
EXTERN(cjpeg_source_ptr) jinit_read_bmp JPP((j_compress_ptr cinfo)); 
EXTERN(djpeg_dest_ptr) jinit_write_bmp JPP((j_decompress_ptr cinfo, 
					    boolean is_os2)); 
EXTERN(cjpeg_source_ptr) jinit_read_gif JPP((j_compress_ptr cinfo)); 
EXTERN(djpeg_dest_ptr) jinit_write_gif JPP((j_decompress_ptr cinfo)); 
EXTERN(cjpeg_source_ptr) jinit_read_ppm JPP((j_compress_ptr cinfo)); 
EXTERN(djpeg_dest_ptr) jinit_write_ppm JPP((j_decompress_ptr cinfo)); 
EXTERN(cjpeg_source_ptr) jinit_read_rle JPP((j_compress_ptr cinfo)); 
EXTERN(djpeg_dest_ptr) jinit_write_rle JPP((j_decompress_ptr cinfo)); 
EXTERN(cjpeg_source_ptr) jinit_read_targa JPP((j_compress_ptr cinfo)); 
EXTERN(djpeg_dest_ptr) jinit_write_targa JPP((j_decompress_ptr cinfo)); 
 
/* cjpeg support routines (in rdswitch.c) */ 
 
EXTERN(boolean) read_quant_tables JPP((j_compress_ptr cinfo, char * filename, 
				    int scale_factor, boolean force_baseline)); 
EXTERN(boolean) read_scan_script JPP((j_compress_ptr cinfo, char * filename)); 
EXTERN(boolean) set_quant_slots JPP((j_compress_ptr cinfo, char *arg)); 
EXTERN(boolean) set_sample_factors JPP((j_compress_ptr cinfo, char *arg)); 
 
/* djpeg support routines (in rdcolmap.c) */ 
 
EXTERN(void) read_color_map JPP((j_decompress_ptr cinfo, FILE * infile)); 
 
/* common support routines (in cdjpeg.c) */ 
 
EXTERN(void) enable_signal_catcher JPP((j_common_ptr cinfo)); 
EXTERN(void) start_progress_monitor JPP((j_common_ptr cinfo, 
					 cd_progress_ptr progress)); 
EXTERN(void) end_progress_monitor JPP((j_common_ptr cinfo)); 
EXTERN(boolean) keymatch JPP((char * arg, const char * keyword, int minchars)); 
EXTERN(FILE *) read_stdin JPP((void)); 
EXTERN(FILE *) write_stdout JPP((void)); 
 
/* miscellaneous useful macros */ 
 
#ifdef DONT_USE_B_MODE		/* define mode parameters for fopen() */ 
#define READ_BINARY	"r" 
#define WRITE_BINARY	"w" 
#else 
#ifdef VMS			/* VMS is very nonstandard */ 
#define READ_BINARY	"rb", "ctx=stm" 
#define WRITE_BINARY	"wb", "ctx=stm" 
#else				/* standard ANSI-compliant case */ 
#define READ_BINARY	"rb" 
#define WRITE_BINARY	"wb" 
#endif 
#endif 
 
#ifndef EXIT_FAILURE		/* define exit() codes if not provided */ 
#define EXIT_FAILURE  1 
#endif 
#ifndef EXIT_SUCCESS 
#ifdef VMS 
#define EXIT_SUCCESS  1		/* VMS is very nonstandard */ 
#else 
#define EXIT_SUCCESS  0 
#endif 
#endif 
#ifndef EXIT_WARNING 
#ifdef VMS 
#define EXIT_WARNING  1		/* VMS is very nonstandard */ 
#else 
#define EXIT_WARNING  2 
#endif 
#endif