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gbmsub.c
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C/C++ Source or Header
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1993-05-20
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6KB
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256 lines
/*
GBMSUB.C Subrectangle of General Bitmap
*/
/*...sincludes:0:*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdarg.h>
#include <memory.h>
#include <malloc.h>
#ifdef AIX
#include <unistd.h>
#else
#include <io.h>
#endif
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef O_BINARY
#define O_BINARY 0
#endif
#include "standard.h"
#include "gbm.h"
#include "gbmrect.h"
/*...vgbm\46\h:0:*/
/*...vgbmrect\46\h:0:*/
/*...e*/
static char progname [] = "gbmsub";
static char sccs_id [] = "@(#)Subrectangle of General Bitmap 1/3/93";
/*...sfatal:0:*/
static void fatal(const char *fmt, ...)
{
va_list vars;
char s [256+1];
va_start(vars, fmt);
vsprintf(s, fmt, vars);
va_end(vars);
fprintf(stderr, "%s: %s\n", progname, s);
exit(1);
}
/*...e*/
/*...susage:0:*/
static void usage(void)
{
int ft, n_ft;
fprintf(stderr, "usage: %s [-x x] [-y y] [-w w] [-h h] fn1.ext{,opt} [fn2.ext{,opt}]\n", progname);
fprintf(stderr, "flags: -x x left edge of rectangle (default 0)\n");
fprintf(stderr, " -y y bottom edge of rectangle (default 0)\n");
fprintf(stderr, " -w w width of rectangle (default width of image - x)\n");
fprintf(stderr, " -h h height of rectangle (default height of image - y)\n");
fprintf(stderr, " fn1.ext{,opt} input filename (with any format specific options)\n");
fprintf(stderr, " fn2.ext{,opt} optional output filename (or will use fn1 if not present)\n");
fprintf(stderr, " ext's are used to deduce desired bitmap file formats\n");
gbm_init();
gbm_query_n_filetypes(&n_ft);
for ( ft = 0; ft < n_ft; ft++ )
{
GBMFT gbmft;
gbm_query_filetype(ft, &gbmft);
fprintf(stderr, " %s when ext in [%s]\n",
gbmft.short_name, gbmft.extensions);
}
gbm_deinit();
fprintf(stderr, " opt's bitmap format specific options\n");
exit(1);
}
/*...e*/
/*...sget_opt_value:0:*/
static int get_opt_value(char *s, char *name)
{
int v;
if ( s == NULL )
fatal("missing %s argument", name);
if ( !isdigit(s [0]) )
fatal("bad %s argument", name);
if ( s [0] == '0' && tolower(s [1]) == 'x' )
sscanf(s + 2, "%x", &v);
else
v = atoi(s);
return ( v );
}
/*...e*/
/*...sget_opt_value_pos:0:*/
static int get_opt_value_pos(char *s, char *name)
{
int n;
if ( (n = get_opt_value(s, name)) < 0 )
fatal("%s should not be negative", name);
return ( n );
}
/*...e*/
/*...smain:0:*/
int main(int argc, char *argv [])
{
int x = 0, y = 0, w = -1, h = -1;
char fn_src [500+1], fn_dst [500+1], *opt_src, *opt_dst;
int fd, ft_src, ft_dst, i, stride_src, flag, bytes;
GBM_ERR rc;
GBMFT gbmft;
GBM gbm;
GBMRGB gbmrgb [0x100];
byte *data;
for ( i = 1; i < argc; i++ )
{
if ( argv [i][0] != '-' )
break;
switch ( argv [i][1] )
{
case 'x':
if ( ++i == argc ) usage();
x = get_opt_value_pos(argv [i], "x");
break;
case 'y':
if ( ++i == argc ) usage();
y = get_opt_value_pos(argv [i], "y");
break;
case 'w':
if ( ++i == argc ) usage();
w = get_opt_value_pos(argv [i], "w");
break;
case 'h':
if ( ++i == argc ) usage();
h = get_opt_value_pos(argv [i], "h");
break;
default:
usage();
break;
}
}
if ( i == argc )
usage();
strcpy(fn_src, argv [i++]);
strcpy(fn_dst, ( i == argc ) ? fn_src : argv [i++]);
if ( i < argc )
usage();
if ( (opt_src = strchr(fn_src, ',')) != NULL )
*opt_src++ = '\0';
else
opt_src = "";
if ( (opt_dst = strchr(fn_dst, ',')) != NULL )
*opt_dst++ = '\0';
else
opt_dst = "";
gbm_init();
if ( gbm_guess_filetype(fn_src, &ft_src) != GBM_ERR_OK )
fatal("can't guess bitmap file format for %s", fn_src);
if ( gbm_guess_filetype(fn_dst, &ft_dst) != GBM_ERR_OK )
fatal("can't guess bitmap file format for %s", fn_dst);
if ( (fd = open(fn_src, O_RDONLY | O_BINARY)) == -1 )
fatal("can't open %s", fn_src);
if ( (rc = gbm_read_header(fn_src, fd, ft_src, &gbm, opt_src)) != GBM_ERR_OK )
{
close(fd);
fatal("can't read header of %s: %s", fn_src, gbm_err(rc));
}
if ( w == -1 )
w = gbm.w - x;
if ( h == -1 )
h = gbm.h - y;
if ( w == 0 ) { close(fd); fatal("w = 0"); }
if ( h == 0 ) { close(fd); fatal("h = 0"); }
if ( x >= gbm.w ) { close(fd); fatal("x >= bitmap width"); }
if ( y >= gbm.h ) { close(fd); fatal("y >= bitmap height"); }
if ( x + w > gbm.w ) { close(fd); fatal("x+w > bitmap width"); }
if ( y + h > gbm.h ) { close(fd); fatal("y+h > bitmap height"); }
gbm_query_filetype(ft_dst, &gbmft);
switch ( gbm.bpp )
{
case 24: flag = GBM_FT_W24; break;
case 8: flag = GBM_FT_W8; break;
case 4: flag = GBM_FT_W4; break;
case 1: flag = GBM_FT_W1; break;
}
if ( (gbmft.flags & flag) == 0 )
{
close(fd);
fatal("output bitmap format %s does not support writing %d bpp data",
gbmft.short_name, gbm.bpp);
}
if ( (rc = gbm_read_palette(fd, ft_src, &gbm, gbmrgb)) != GBM_ERR_OK )
{
close(fd);
fatal("can't read palette of %s: %s", fn_src, gbm_err(rc));
}
stride_src = ( ((gbm.w * gbm.bpp + 31)/32) * 4 );
bytes = stride_src * gbm.h;
if ( (data = malloc(bytes)) == NULL )
{
close(fd);
fatal("out of memory allocating %d bytes for bitmap", bytes);
}
if ( (rc = gbm_read_data(fd, ft_src, &gbm, data)) != GBM_ERR_OK )
{
close(fd);
fatal("can't read bitmap data of %s: %s", fn_src, gbm_err(rc));
}
close(fd);
gbm_subrectangle(&gbm, x, y, w, h, data, data);
if ( (fd = open(fn_dst, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, S_IREAD | S_IWRITE)) == -1 )
fatal("can't create %s", fn_dst);
gbm.w = w;
gbm.h = h;
if ( (rc = gbm_write(fn_dst, fd, ft_dst, &gbm, gbmrgb, data, opt_dst)) != GBM_ERR_OK )
{
close(fd);
fatal("can't write %s: %s", fn_dst, gbm_err(rc));
}
close(fd);
free(data);
gbm_deinit();
return ( 0 );
}
/*...e*/