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gbmiax.c
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C/C++ Source or Header
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1993-09-27
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5KB
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239 lines
/*
GBMIAX.C IBM Image Access eXecutive support
Reads array as 8 bit greyscale.
Writes grey equivelent of passed in 8 bit colour data (no palette written).
Input options: width=# (default: 512)
Output options: r,g,b,k (default: k)
*/
/*...sincludes:0:*/
#include <stdio.h>
#include <ctype.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.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>
#include "standard.h"
#include "gbm.h"
/*...vgbm\46\h:0:*/
/*...e*/
/*...suseful:0:*/
#define low_byte(w) ((byte) ((w)&0x00ff) )
#define high_byte(w) ((byte) (((w)&0xff00)>>8))
#define make_word(a,b) (((word)a) + (((word)b) << 8))
/*...e*/
/*...ssame:0:*/
static BOOLEAN same(char *s1, char *s2, int n)
{
for ( ; n--; s1++, s2++ )
if ( tolower(*s1) != tolower(*s2) )
return ( FALSE );
return ( TRUE );
}
/*...e*/
/*...sfind_word:0:*/
static char *find_word(char *str, char *substr)
{
char buf [100+1], *s;
int len = strlen(substr);
for ( s = strtok(strcpy(buf, str), " \t,");
s != NULL;
s = strtok(NULL, " \t,") )
if ( same(s, substr, len) && s [len] == '\0' )
return ( str + (s - buf) );
return ( NULL );
}
/*...e*/
/*...sfind_word_prefix:0:*/
static char *find_word_prefix(char *str, char *substr)
{
char buf [100+1], *s;
int len = strlen(substr);
for ( s = strtok(strcpy(buf, str), " \t,");
s != NULL;
s = strtok(NULL, " \t,") )
if ( same(s, substr, len) )
return ( str + (s - buf) );
return ( NULL );
}
/*...e*/
/*...smake_output_palette:0:*/
#define SW4(a,b,c,d) ((a)*8+(b)*4+(c)*2+(d))
static BOOLEAN make_output_palette(GBMRGB gbmrgb [], byte grey [], char *opt)
{
BOOLEAN k = ( find_word(opt, "k") != NULL );
BOOLEAN r = ( find_word(opt, "r") != NULL );
BOOLEAN g = ( find_word(opt, "g") != NULL );
BOOLEAN b = ( find_word(opt, "b") != NULL );
int i;
switch ( SW4(k,r,g,b) )
{
case SW4(0,0,0,0):
/* Default is the same as "k" */
case SW4(1,0,0,0):
for ( i = 0; i < 0x100; i++ )
grey [i] = (byte) ( ((word) gbmrgb [i].r * 77 +
(word) gbmrgb [i].g * 151 +
(word) gbmrgb [i].b * 28) >> 8 );
return ( TRUE );
case SW4(0,1,0,0):
for ( i = 0; i < 0x100; i++ )
grey [i] = gbmrgb [i].r;
return ( TRUE );
case SW4(0,0,1,0):
for ( i = 0; i < 0x100; i++ )
grey [i] = gbmrgb [i].g;
return ( TRUE );
case SW4(0,0,0,1):
for ( i = 0; i < 0x100; i++ )
grey [i] = gbmrgb [i].b;
return ( TRUE );
}
return ( FALSE );
}
/*...e*/
static GBMFT iax_gbmft =
{
"IAX",
"IBM Image Access eXecutive",
"IAX",
GBM_FT_R8|
GBM_FT_W8,
};
#define GBM_ERR_IAX_SIZE ((GBM_ERR) 1500)
/*...siax_qft:0:*/
GBM_ERR iax_qft(GBMFT *gbmft)
{
*gbmft = iax_gbmft;
return ( GBM_ERR_OK );
}
/*...e*/
/*...siax_rhdr:0:*/
GBM_ERR iax_rhdr(char *fn, int fd, GBM *gbm, char *opt)
{
long length;
int w, h;
char *width;
fn=fn; fd=fd; /* Suppress 'unref arg' compiler warnings */
length = lseek(fd, 0L, SEEK_END);
lseek(fd, 0L, SEEK_SET);
if ( (width = find_word_prefix(opt, "width=")) != NULL )
sscanf(width + 6, "%d", &w);
else
w = 512;
h = (int) (length / w);
if ( w <= 0 || h <= 0 )
return ( GBM_ERR_BAD_SIZE );
if ( w * h != length )
return ( GBM_ERR_IAX_SIZE );
gbm -> w = w;
gbm -> h = h;
gbm -> bpp = 8;
return ( GBM_ERR_OK );
}
/*...e*/
/*...siax_rpal:0:*/
GBM_ERR iax_rpal(int fd, GBM *gbm, GBMRGB *gbmrgb)
{
int i;
fd=fd; gbm=gbm; /* Suppress 'unref arg' compiler warnings */
for ( i = 0; i < 0x100; i++ )
gbmrgb [i].r =
gbmrgb [i].g =
gbmrgb [i].b = (byte) i;
return ( GBM_ERR_OK );
}
/*...e*/
/*...siax_rdata:0:*/
GBM_ERR iax_rdata(int fd, GBM *gbm, byte *data)
{
int i, stride;
byte *p;
stride = ((gbm -> w + 3) & ~3);
p = data + ((gbm -> h - 1) * stride);
for ( i = gbm -> h - 1; i >= 0; i-- )
{
read(fd, p, gbm -> w);
p -= stride;
}
return ( GBM_ERR_OK );
}
/*...e*/
/*...siax_w:0:*/
GBM_ERR iax_w(char *fn, int fd, GBM *gbm, GBMRGB *gbmrgb, byte *data, char *opt)
{
int i, j, stride;
byte grey [0x100];
byte *p, *linebuf;
fn=fn; /* Suppress 'unref arg' compiler warning */
if ( gbm -> bpp != 8 )
return ( GBM_ERR_NOT_SUPP );
if ( !make_output_palette(gbmrgb, grey, opt) )
return ( GBM_ERR_BAD_OPTION );
if ( (linebuf = malloc(gbm -> w)) == NULL )
return ( GBM_ERR_MEM );
stride = ((gbm -> w + 3) & ~3);
p = data + ((gbm -> h - 1) * stride);
for ( i = gbm -> h - 1; i >= 0; i-- )
{
for ( j = 0; j < gbm -> w; j++ )
linebuf [j] = grey [p [j]];
write(fd, linebuf, gbm -> w);
p -= stride;
}
free(linebuf);
return ( GBM_ERR_OK );
}
/*...e*/
/*...siax_err:0:*/
char *iax_err(GBM_ERR rc)
{
switch ( (int) rc )
{
case GBM_ERR_IAX_SIZE:
return ( "file length is not a multiple of its width" );
}
return ( NULL );
}
/*...e*/