index2ppm.c

JPEG2000实现的源码

/*****************************************************************************/
/* Copyright 1999,  Sharp Labs. of America.                                  */
/* All rights reserved                                                       */
/* File: "index2ppm.c"                                                       */
/* Description: convert index map and table to ppm file                      */
/* Author: Wenjun Zeng                                                       */
/* Affiliation:  Sharp Labs. of America., [e-mail]                */
/* Version: VM6.0                                                            */
/* Last Revised: 4 Jan, 2000                                                 */
/*****************************************************************************/
 
/*_______________________________________________________________
|                                                                | 
|                                                                | 
|   reconstruct a .ppm file from the index image (in .pgx format)|
|   and the color palette table                                  |
|   currently limited to max. of 256 colors                      |
|   (i.e., bitdepth of pgx file <=8)                             |
|                                                                | 
 _______________________________________________________________*/


#include <stdio.h>
#include "palette.h"


main( int argc, char **argv)
{

  FILE *ptin;
  unsigned int rows, cols;
  int *buff,*ptr;
  int i,j;
  int *buff_tbl, *buff_rgb, *ptr_rgb;
  int entries, comp, length;

  /*   CheckUsage  */
  if (argc!=4) 
    {
      fprintf(stderr,"usage: index2ppm input(.pgx) input(.tbl)  output(.ppm),  \n");
      exit(-1);
    }

  /* open index image in pgx format */
  ptin =read_pgx_header (argv[1],&rows,&cols);
  buff=(unsigned int *)alloc_int1(rows*cols);
  read_int_1D_raw(ptin,buff,rows*cols);

  /* open table file (one header line following by raw data)  */
  ptin =read_tbl_header(argv[2],&entries,&comp);

  length=entries*comp;
  buff_tbl=(unsigned int *)alloc_int1(length);
  read_int_1D_raw(ptin,buff_tbl,length);
	
  buff_rgb=(unsigned int *)alloc_int1(rows*cols*comp);
  ptr_rgb=buff_rgb;
  ptr=buff;
  for (i=0; i<rows*cols; i++)
    {
      for (j=0; j<comp;j++)
	*ptr_rgb++= *(buff_tbl+(*ptr) * comp+j);
      ptr++;
    }

  write_int_1D_ppm(argv[3],buff_rgb,rows,cols);

  free_int1(buff_tbl);
  free_int1(buff_rgb);
  free_int1(buff);
  
}