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smooth.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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95 lines
/* smooth.c:
*
* this performs a smoothing convolution using a 3x3 area.
*
* jim frost 09.20.90
*
* Copyright 1990, 1991 Jim Frost.
* See included file "copyright.h" for complete copyright information.
*/
#include "copyright.h"
#include "image.h"
static Image *doSmooth(image)
Image *image;
{ Image *old, *new;
int x, y, x1, y1, linelen;
int xindex[3];
byte *yindex[3];
byte *destptr;
Pixel pixval;
unsigned long avgred, avggreen, avgblue;
/* build true color image from old image and allocate new image
*/
old= expand(image);
new= newTrueImage(image->width, image->height);
new->title= (char *)lmalloc(strlen(image->title) + 12);
sprintf(new->title, "%s (smoothed)", image->title);
/* run through image and take a guess as to what the color should
* actually be.
*/
destptr= new->data;
linelen= old->pixlen * old->width;
for (y= 0; y < old->height; y++) {
yindex[1]= old->data + (y * linelen);
yindex[0]= yindex[1] - (y > 0 ? linelen : 0);
yindex[2]= yindex[1] + (y < old->height - 1 ? linelen : 0);
for (x= 0; x < old->width; x++) {
avgred= avggreen= avgblue= 0;
xindex[1]= x * old->pixlen;
xindex[0]= xindex[1] - (x > 0 ? old->pixlen : 0);
xindex[2]= xindex[1] + (x < old->width - 1 ? old->pixlen : 0);
for (y1= 0; y1 < 3; y1++) {
for (x1= 0; x1 < 3; x1++) {
pixval= memToVal(yindex[y1] + xindex[x1], old->pixlen);
avgred += TRUE_RED(pixval);
avggreen += TRUE_GREEN(pixval);
avgblue += TRUE_BLUE(pixval);
}
}
/* average the pixel values
*/
avgred= ((avgred + 8) / 9);
avggreen= ((avggreen + 8) / 9);
avgblue= ((avgblue + 8) / 9);
pixval= (avgred << 16) | (avggreen << 8) | avgblue;
valToMem(pixval, destptr, new->pixlen);
destptr += new->pixlen;
}
}
if (old != image)
freeImage(old);
return(new);
}
Image *smooth(image, iterations, verbose)
Image *image;
int verbose;
{ int a;
Image *new;
if (verbose) {
printf(" Smoothing...");
fflush(stdout);
}
for (a= 0; a < iterations; a++) {
new= doSmooth(image);
freeImage(image);
image= new;
}
if (verbose)
printf("done\n");
return(image);
}