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zoom.c
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zoom.c
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/* zoom.c:
*
* zoom an image
*
* jim frost 10.11.89
*
* Copyright 1989 Jim Frost. See included file "copyright.h" for complete
* copyright information.
*/
#include "copyright.h"
#include "image.h"
static unsigned int *buildIndex(width, zoom, rwidth)
unsigned int width;
unsigned int zoom;
unsigned int *rwidth;
{ float fzoom;
unsigned int *index;
unsigned int a;
if (!zoom) {
fzoom= 100.0;
*rwidth= width;
}
else {
fzoom= (float)zoom / 100.0;
*rwidth= fzoom * width;
}
index= (unsigned int *)lmalloc(sizeof(unsigned int) * *rwidth);
for (a= 0; a < *rwidth; a++)
if (zoom)
*(index + a)= (float)a / fzoom;
else
*(index + a)= a;
return(index);
}
Image *zoom(oimage, xzoom, yzoom, verbose)
Image *oimage;
unsigned int xzoom, yzoom;
unsigned int verbose;
{ char buf[BUFSIZ];
Image *image;
unsigned int *xindex, *yindex;
unsigned int xwidth, ywidth;
unsigned int x, y, xsrc, ysrc;
unsigned int pixlen;
unsigned int srclinelen;
unsigned int destlinelen;
byte *srcline, *srcptr;
byte *destline, *destptr;
byte srcmask, destmask, bit;
Pixel value;
goodImage(oimage, "zoom");
if (!xzoom && !yzoom) /* stupid user */
return(NULL);
if (!xzoom) {
if (verbose)
printf(" Zooming image Y axis by %d%%...", yzoom);
sprintf(buf, "%s (Y zoom %d%%)", oimage->title, yzoom);
}
else if (!yzoom) {
if (verbose)
printf(" Zooming image X axis by %d%%...", xzoom);
sprintf(buf, "%s (X zoom %d%%)", oimage->title, xzoom);
}
else if (xzoom == yzoom) {
if (verbose)
printf(" Zooming image by %d%%...", xzoom);
sprintf(buf, "%s (%d%% zoom)", oimage->title, xzoom);
}
else {
if (verbose)
printf(" Zooming image X axis by %d%% and Y axis by %d%%...",
xzoom, yzoom);
sprintf(buf, "%s (X zoom %d%% Y zoom %d%%)", oimage->title,
xzoom, yzoom);
}
if (verbose)
fflush(stdout);
xindex= buildIndex(oimage->width, xzoom, &xwidth);
yindex= buildIndex(oimage->height, yzoom, &ywidth);
switch (oimage->type) {
case IBITMAP:
image= newBitImage(xwidth, ywidth);
for (x= 0; x < oimage->rgb.used; x++) {
*(image->rgb.red + x)= *(oimage->rgb.red + x);
*(image->rgb.green + x)= *(oimage->rgb.green + x);
*(image->rgb.blue + x)= *(oimage->rgb.blue + x);
}
image->rgb.used= oimage->rgb.used;
destline= image->data;
destlinelen= (xwidth / 8) + (xwidth % 8 ? 1 : 0);
srcline= oimage->data;
srclinelen= (oimage->width / 8) + (oimage->width % 8 ? 1 : 0);
for (y= 0, ysrc= *(yindex + y); y < ywidth; y++) {
while (ysrc != *(yindex + y)) {
ysrc++;
srcline += srclinelen;
}
srcptr= srcline;
destptr= destline;
srcmask= 0x80;
destmask= 0x80;
bit= srcmask & *srcptr;
for (x= 0, xsrc= *(xindex + x); x < xwidth; x++) {
if (xsrc != *(xindex + x)) {
do {
xsrc++;
if (!(srcmask >>= 1)) {
srcmask= 0x80;
srcptr++;
}
} while (xsrc != *(xindex + x));
bit= srcmask & *srcptr;
}
if (bit)
*destptr |= destmask;
if (!(destmask >>= 1)) {
destmask= 0x80;
destptr++;
}
}
destline += destlinelen;
}
break;
case IRGB:
image= newRGBImage(xwidth, ywidth, oimage->depth);
for (x= 0; x < oimage->rgb.used; x++) {
*(image->rgb.red + x)= *(oimage->rgb.red + x);
*(image->rgb.green + x)= *(oimage->rgb.green + x);
*(image->rgb.blue + x)= *(oimage->rgb.blue + x);
}
image->rgb.used= oimage->rgb.used;
/* FALLTHRU */
case ITRUE:
if (!RGBP(oimage))
image= newTrueImage(xwidth, ywidth);
pixlen= oimage->pixlen;
destptr= image->data;
srcline= oimage->data;
srclinelen= oimage->width * pixlen;
for (y= 0, ysrc= *(yindex + y); y < ywidth; y++) {
while (ysrc != *(yindex + y)) {
ysrc++;
srcline += srclinelen;
}
srcptr= srcline;
value= memToVal(srcptr, pixlen);
for (x= 0, xsrc= *(xindex + x); x < xwidth; x++) {
if (xsrc != *(xindex + x)) {
do {
xsrc++;
srcptr += image->pixlen;
} while (xsrc != *(xindex + x));
value= memToVal(srcptr, pixlen);
}
valToMem(value, destptr, pixlen);
destptr += pixlen;
}
}
break;
}
image->title= dupString(buf);
lfree((byte *)xindex);
lfree((byte *)yindex);
if (verbose)
printf("done\n");
return(image);
}