gwe@cbdkc1.UUCP ( George Erhart ) (03/21/85)
Hello, this is a little program to convert a MacPaint style bitmap
to a blit twid style bitmap. The format of the MacPaint data fork
has already been post. The format of the blit twid bitmap is as
follows:
XXXX XXXX XXXX XXXX
[non-encoded bitmap data here]
The XXXX's are paired so that the first pair are the 16 bit numbers
for the origin or upper left corner. The second pair are the 16 bit
numbers for the corner or lower right hand side of the screen. All
the data is in unencoded binary format. The twid program can read
this data provided your window size and memory are big enough. Also
note that the coordinates are byte swapped, but the bitmap data is not.
To compile this program type:
cc -o decode decode.c
To use this program, first use xbin on the .hex file. (If you got it
from the net.) Or upload the document using a terminal program. Then type
decode <pic.data >pic.twid
Invoke the twid program while in layers. Click button 3 and select
the *unix* entry, click again and select *read*. Type "pic1.twid"
to load the bitmap.
This program has NOT been tested with twid running on the DMD (5620).
I would like to hear from you if it does work.
Happy Hacking!!!
George Erhart
ATT-NS/Bell Labs
{ihnp4,cbosgd}!cbdkc1!gwe
________________________CUT_HERE_______________________________________
#include <stdio.h>
main()
{
unsigned char head[512];
unsigned long vers;
int byte;
int tag;
char x;
int index;
short screen[4];
/* a kluge to set up the Rectangle structure that twid expects */
screen[0] = 0; /* origin 0,0 */
screen[1] = 0;
screen[2] = 16386; /* corner 576,720 - note the byte swab! */
screen[3] = 53250;
/* read MacPaint header ... skip it */
for (index = 0 ; index < 512 ; index ++)
if ((head[index] = (unsigned char) getchar()) == EOF)
exit( 1 );
/* make the version number if you are interested
* for (index = 0; index < 4; index++)
* vers = head[index]<<(3 - index);
*/
/* write the rect. coordinates into the output */
write(1,(char *)screen, 8);
/* expand the scan data */
/* get the count byte */
while ((tag = getchar()) != EOF) {
x = (char) tag;
/* is this a compressed byte? */
if ((x < -1) && (x > -127)) {
byte = getchar();
/* expand the compress byte to proper size */
for (index = abs((int) x)+1; index > 0; index--) {
putchar(byte);
}
} else {
/* skip -128 counts ... they are obsolete */
if (x == -128)
/* nothing */ ;
else {
/* read raw uncompressed bytes */
if ((x >= 0) && (x < 128)) {
for (index = (int) x+1; index > 0; index --)
putchar(getchar());
}
}
}
}
}