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wmaker/wrlib/convolve.c
scottc 9d2e6ef9f1 Initial revision
1998-09-29 22:36:29 +00:00

326 lines
6.3 KiB
C
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/*
* Raster graphics library
*
* Copyright (c) 1997 Alfredo K. Kojima
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
/* AIX requires this to be the first thing in the file. */
#ifdef __GNUC__
# define alloca __builtin_alloca
#else
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
# pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include "wraster.h"
/*
*----------------------------------------------------------------------
* RBlurImage--
* Apply 3x3 1 1 1 low pass, convolution mask to image.
* 1 1 1
* 1 1 1 /9
*----------------------------------------------------------------------
*/
int
RBlurImage(RImage *image)
{
register int x, y;
register int w, tmp;
unsigned char *r, *g, *b, *a;
unsigned char *pr=NULL, *pg=NULL, *pb=NULL, *pa=NULL;
#define MASK(c,pc,p) ((*c + *(c-1) + *(c+1) + pc[p] + pc[p-1] + pc[p+1] \
+ *(c+w) + *(c+w-1) + *(c+w+1))/9)
pr = (unsigned char*)alloca(image->width*sizeof(char));
if (!pr)
goto outofmem;
pg = (unsigned char*)alloca(image->width*sizeof(char));
if (!pg)
goto outofmem;
pb = (unsigned char*)alloca(image->width*sizeof(char));
if (!pb)
goto outofmem;
pa = (unsigned char*)alloca(image->width*sizeof(char));
if (!pa)
goto outofmem;
r = image->data[0];
g = image->data[1];
b = image->data[2];
a = image->data[3];
for (x=0; x<image->width; x++) {
pr[x] = *(r++);
pg[x] = *(g++);
pb[x] = *(b++);
}
w = image->width;
for (y=1; y<image->height-1; y++) {
pr[w-1] = r[w-1];
pg[w-1] = g[w-1];
pb[w-1] = b[w-1];
pr[0] = *(r++);
pg[0] = *(g++);
pb[0] = *(b++);
for (x=1; x<image->width-1; x++) {
tmp = *r;
*(r++) = MASK(r,pr,x);
pr[x] = tmp;
tmp = *g;
*(g++) = MASK(g,pg,x);
pg[x] = tmp;
tmp = *b;
*(b++) = MASK(b,pb,x);
pb[x] = tmp;
}
r++;
g++;
b++;
}
#undef MASK
#ifdef C_ALLOCA
alloca(0);
#endif
return True;
outofmem:
sprintf(RErrorString, "out of memory");
#ifdef C_ALLOCA
alloca(0);
#endif
return False;
}
#if 0
int
REdgeDetectImage(RImage *image)
{
register int x, y, d1, d2, d3, d4, rsum;
int w;
unsigned char *r, *g, *b, *a;
unsigned char *dr, *dg, *db, *da;
unsigned char *pr=NULL, *pg=NULL, *pb=NULL, *pa=NULL;
RImage *image2;
image2 = RCloneImage(image);
pr = alloca(image->width*sizeof(char));
if (!pr)
goto outofmem;
pg = alloca(image->width*sizeof(char));
if (!pg)
goto outofmem;
pb = alloca(image->width*sizeof(char));
if (!pb)
goto outofmem;
pa = alloca(image->width*sizeof(char));
if (!pa)
goto outofmem;
r = image->data[0];
g = image->data[1];
b = image->data[2];
a = image->data[3];
dr = image2->data[0];
dg = image2->data[1];
db = image2->data[2];
da = image2->data[3];
for (x=0; x<image->width; x++) {
*(dr++) = *(r++);
*(dg++) = *(g++);
*(db++) = *(b++);
}
w = image->width;
for (y=1; y<image->height-1; y++) {
dr[w-1] = r[w-1];
dg[w-1] = g[w-1];
db[w-1] = b[w-1];
*(dr++) = *(r++);
*(dg++) = *(g++);
*(db++) = *(b++);
for (x=1; x<image->width-1; x++) {
d1 = r[w+1] - r[-w-1];
d2 = r[1] - r[-1];
d3 = r[-w+1] - r[w-1];
d4 = r[-w] - r[w];
rsum = d1 + d2 + d3;
if (rsum < 0) rsum = -rsum;
d1 = d1 - d2 - d4; /* vertical gradient */
if (d1 < 0) d1 = -d1;
if (d1 > rsum) rsum = d1;
rsum /= 3;
*(dr++) = rsum;
d1 = g[w+1] - g[-w-1];
d2 = g[1] - g[-1];
d3 = g[-w+1] - g[w-1];
d4 = g[-w] - g[w];
rsum = d1 + d2 + d3;
if (rsum < 0) rsum = -rsum;
d1 = d1 - d2 - d4; /* vertical gradient */
if (d1 < 0) d1 = -d1;
if (d1 > rsum) rsum = d1;
rsum /= 3;
*(dg++) = rsum;
d1 = b[w+1] - b[-w-1];
d2 = b[1] - b[-1];
d3 = b[-w+1] - b[w-1];
d4 = b[-w] - b[w];
rsum = d1 + d2 + d3;
if (rsum < 0) rsum = -rsum;
d1 = d1 - d2 - d4; /* vertical gradient */
if (d1 < 0) d1 = -d1;
if (d1 > rsum) rsum = d1;
rsum /= 3;
*(db++) = rsum;
r++;
g++;
b++;
}
r++;
g++;
b++;
dr++;
dg++;
db++;
}
{
r = image->data[0];
image2->data[0] = r;
g = image->data[1];
image2->data[1] = g;
b = image->data[2];
image2->data[2] = b;
RDestroyImage(image2);
}
#undef MASK
return True;
}
int
RSmoothImage(RImage *image)
{
register int x, y;
register int v, w;
unsigned char *r, *g, *b, *a;
r = image->data[0];
g = image->data[1];
b = image->data[2];
a = image->data[3];
w = image->width;
for (y=0; y<image->height - 1; y++) {
for (x=0; x<image->width - 1; x++) {
v = *r + 2 * *(r + 1) + 2 * *(r + w) + *(r + w + 1);
*(r++) = v/6;
v = *g + 2 * *(g + 1) + 2 * *(g + w) + *(g + w + 1);
*(g++) = v/6;
v = *b + 2 * *(b + 1) + 2 * *(b + w) + *(b + w + 1);
*(b++) = v/6;
}
/* last column */
v = 3 * *r + 3 * *(r + w);
*(r++) = v/6;
v = 3 * *g + 3 * *(g + w);
*(g++) = v/6;
v = 3 * *b + 3 * *(b + w);
*(b++) = v/6;
}
/* last line */
for (x=0; x<image->width - 1; x++) {
v = 3 * *r + 3 * *(r + 1);
*(r++) = v/6;
v = 3 * *g + 3 * *(g + 1);
*(g++) = v/6;
v = 3 * *b + 3 * *(b + 1);
*(b++) = v/6;
}
return True;
}
#endif
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