mirror of
https://github.com/kichikuou/xsystem35-sdl2.git
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81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
/*
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* antialiase.c make antialiased pattern
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*
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* Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
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* 1998- <masaki-c@is.aist-nara.ac.jp>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/* $Id: antialiase.c,v 1.3 2001/03/19 12:18:39 chikama Exp $ */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "portab.h"
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static void memadd(BYTE *s, BYTE *d, int w, int h) {
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int x, y;
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for (y = 0; y < h; y++) {
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for (x = 0; x < w; x++) {
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*d += *s;
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*(d+1) += *s;
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*(d+2) += *s;
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*(d+w+2) += *s;
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*(d+w+1+2) += (*s * 16);
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*(d+w+1+2) += *s;
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*(d+w+w+4) += *s;
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*(d+w+w+1+4) += *s;
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*(d+w+w+2+4) += *s;
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d++; s++;
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}
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d+=2;
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}
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}
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static void memmul(BYTE *s, int mul, int pixel) {
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while(pixel--) {
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*s = min(255, (*s) * mul); s++;
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}
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}
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void aa_make(BYTE *data, int w, int h, int bytes_per_line) {
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int y;
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BYTE *b, *_b, *__b;
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BYTE *d = data;
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b = calloc(w*h, sizeof(BYTE));
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_b = calloc((w+2)*(h+2), sizeof(BYTE));
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__b = b;
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for (y = 0; y < h; y++) {
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memcpy(__b, d, w);
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__b+=w; d+=bytes_per_line;
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}
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memadd(b, _b, w, h);
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memmul(_b, 16, (w+2)*(h+2));
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d = data;
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__b = _b;
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for (y = 0; y < h+2; y++) {
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memcpy(d, __b, w+2);
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__b += (w+2); d+=bytes_per_line;
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}
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free(b);
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free(_b);
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}
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