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fill.c
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C/C++ Source or Header
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1991-05-20
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2KB
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70 lines
/* fill.c:
*
* fill an image area with a particular pixel value
*
* jim frost 10.02.89
*
* Copyright 1989, 1991 Jim Frost.
* See included file "copyright.h" for complete copyright information.
*/
#include "copyright.h"
#include "image.h"
void fill(image, fx, fy, fw, fh, pixval)
Image *image;
unsigned int fx, fy, fw, fh;
Pixel pixval;
{ unsigned int x, y;
unsigned int linelen, start;
byte *lineptr, *pixptr;
byte startmask, mask;
goodImage(image, "fill");
switch(image->type) {
case IBITMAP:
/* this could be made a lot faster
*/
linelen= (image->width / 8) + (image->width % 8 ? 1 : 0);
lineptr= image->data + (linelen * fy);
start= (fx / 8) + (fx % 8 ? 1 : 0);
startmask= 0x80 >> (fx % 8);
for (y= fy; y < fy + fh; y++) {
mask= startmask;
pixptr= lineptr + start;
for (x= fx; x < fw; x++) {
if (pixval)
*pixptr |= mask;
else
*pixptr &= ~mask;
if (mask >>= 1) {
mask= 0x80;
pixptr++;
}
}
lineptr += linelen;
}
break;
case IRGB:
case ITRUE:
linelen= image->width * image->pixlen;
start= image->pixlen * fx;
lineptr= image->data + (linelen * fy);
for (y= fy; y < fy + fh; y++) {
pixptr= lineptr + start;
for (x= fx; x < fw; x++) {
valToMem(pixval, pixptr, image->pixlen);
pixptr += image->pixlen;
}
lineptr += linelen;
}
break;
default:
printf("fill: Unsupported image type (ignored)\n");
return;
}
}