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/* +-------------------------------------------------------------------+ */
/* | Copyright 1992, 1993, David Koblas (koblas@netcom.com) | */
/* | | */
/* | Permission to use, copy, modify, and to distribute this software | */
/* | and its documentation for any purpose is hereby granted without | */
/* | fee, provided that the above copyright notice appear in all | */
/* | copies and that both that copyright notice and this permission | */
/* | notice appear in supporting documentation. There is no | */
/* | representations about the suitability of this software for | */
/* | any purpose. this software is provided "as is" without express | */
/* | or implied warranty. | */
/* | | */
/* +-------------------------------------------------------------------+ */
/* $Id: readWritePNM.c,v 1.2 1996/04/19 09:30:20 torsten Exp $ */
#include <stdio.h>
#include "image.h"
#include "libpnmrw.h"
#define TRUE 1
#define FALSE 0
Image *
ReadPNM(char *file)
{
int x, y;
xel **els = NULL;
xel *curel;
xelval maxval;
int pnm_type;
FILE *fd;
Image *image;
int format;
int wth, hth;
unsigned char *dp;
pnm_init2(file);
if ((fd = fopen(file, "r")) == NULL)
return NULL;
if ((els = pnm_readpnm(fd, &wth, &hth, &maxval, &format)) == NULL)
return NULL;
pnm_type = PNM_FORMAT_TYPE(format);
fclose(fd);
if (pnm_type == PBM_TYPE)
image = ImageNewBW(wth, hth);
else if (pnm_type == PGM_TYPE)
image = ImageNewGrey(wth, hth);
else
image = ImageNew(wth, hth);
dp = image->data;
for (y = 0; y < hth; y++) {
for (curel = els[y], x = 0; x < wth; x++, curel++) {
if (pnm_type == PPM_TYPE) {
*dp++ = 255 * PPM_GETR(*curel) / maxval;
*dp++ = 255 * PPM_GETG(*curel) / maxval;
*dp++ = 255 * PPM_GETB(*curel) / maxval;
} else if (pnm_type == PGM_TYPE) {
*dp++ = 255 * PNM_GET1(*curel) / maxval;
} else {
*dp++ = (PNM_GET1(*curel) != PBM_WHITE) ? 1 : 0;
}
}
}
pnm_freearray(els, hth);
return image;
}
static int writePNM(char *file, FILE * fd, Image * image, int flag)
{
xel **xels;
int x, y;
unsigned char *ip;
int format;
if (image->isBW)
format = PBM_FORMAT;
else if (image->isGrey)
format = PGM_FORMAT;
else
format = PPM_FORMAT;
pnm_init2(file);
xels = pnm_allocarray(image->width, image->height);
for (y = 0; y < image->height; y++)
for (x = 0; x < image->width; x++) {
ip = ImagePixel(image, x, y);
PPM_ASSIGN(xels[y][x], ip[0], ip[1], ip[2]);
}
pnm_writepnm(fd, xels, image->width, image->height, 255, format, flag);
pnm_freearray(xels, image->height);
return FALSE;
}
int WritePNM(char *file, Image * image)
{
FILE *fd;
int rc;
if ((fd = fopen(file, "w")) == NULL)
return TRUE;
rc = writePNM(file, fd, image, FALSE);
fclose(fd);
return rc;
}
int WriteAsciiPNM(char *file, Image * image)
{
FILE *fd;
int rc;
if ((fd = fopen(file, "w")) == NULL)
return TRUE;
rc = writePNM(file, fd, image, TRUE);
fclose(fd);
return rc;
}
int WriteAsciiPNMfd(FILE * fd, Image * image)
{
return writePNM("filename", fd, image, TRUE);
}
int TestPNM(char *file)
{
FILE *fd;
int ret = FALSE;
char buf[4];
if ((fd = fopen(file, "r")) == NULL)
return FALSE;
if (fread(buf, sizeof(char), 3, fd) == 3) {
if (buf[0] == 'P') {
switch (buf[1]) {
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
ret = TRUE;
default:
break;
}
}
}
fclose(fd);
return ret;
}
|
