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143 lines
2.9 KiB
C
143 lines
2.9 KiB
C
/*
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* Raster graphics library
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*
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* Copyright (c) 1997-2003 Alfredo K. Kojima
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include "wraster.h"
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/*
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*----------------------------------------------------------------------
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* RBlurImage--
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* Apply 3x3 1 1 1 low pass, convolution mask to image.
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* 1 2 1
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* 1 1 1 /10
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*----------------------------------------------------------------------
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*/
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int RBlurImage(RImage * image)
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{
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register int x, y;
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register int tmp;
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unsigned char *ptr, *nptr;
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unsigned char *pptr = NULL, *tmpp;
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int ch = image->format == RRGBAFormat ? 4 : 3;
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pptr = malloc(image->width * ch);
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if (!pptr) {
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RErrorCode = RERR_NOMEMORY;
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return False;
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}
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#define MASK(prev, cur, next, ch)\
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(*(prev-ch) + *prev + *(prev+ch)\
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+*(cur-ch) + 2 * *cur + *(cur+ch)\
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+*(next-ch) + *next + *(next+ch)) / 10
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memcpy(pptr, image->data, image->width * ch);
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ptr = image->data;
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nptr = ptr + image->width * ch;
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tmpp = pptr;
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if (ch == 3) {
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ptr += 3;
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nptr += 3;
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pptr += 3;
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for (y = 1; y < image->height - 1; y++) {
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for (x = 1; x < image->width - 1; x++) {
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tmp = *ptr;
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*ptr = MASK(pptr, ptr, nptr, 3);
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*pptr = tmp;
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ptr++;
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nptr++;
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pptr++;
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tmp = *ptr;
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*ptr = MASK(pptr, ptr, nptr, 3);
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*pptr = tmp;
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ptr++;
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nptr++;
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pptr++;
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tmp = *ptr;
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*ptr = MASK(pptr, ptr, nptr, 3);
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*pptr = tmp;
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ptr++;
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nptr++;
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pptr++;
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}
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pptr = tmpp;
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ptr += 6;
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nptr += 6;
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pptr += 6;
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}
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} else {
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ptr += 4;
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nptr += 4;
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pptr += 4;
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for (y = 1; y < image->height - 1; y++) {
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for (x = 1; x < image->width - 1; x++) {
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tmp = *ptr;
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*ptr = MASK(pptr, ptr, nptr, 4);
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*pptr = tmp;
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ptr++;
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nptr++;
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pptr++;
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tmp = *ptr;
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*ptr = MASK(pptr, ptr, nptr, 4);
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*pptr = tmp;
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ptr++;
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nptr++;
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pptr++;
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tmp = *ptr;
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*ptr = MASK(pptr, ptr, nptr, 4);
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*pptr = tmp;
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ptr++;
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nptr++;
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pptr++;
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tmp = *ptr;
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*ptr = MASK(pptr, ptr, nptr, 4);
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*pptr = tmp;
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ptr++;
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nptr++;
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pptr++;
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}
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pptr = tmpp;
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ptr += 8;
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nptr += 8;
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pptr += 8;
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}
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}
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free(tmpp);
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return True;
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}
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