cdjpeg.h

jpeg 压缩/解压缩库,是Intel 在ijg基础上改进的libjpeg,encode/decode是ijg的速度的2倍以上。

/*
 * 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