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/*
* graph_copy.c pixel ǡΥԡ
*
* Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
* 1998- <masaki-c@is.aist-nara.ac.jp>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* $Id: graph_copy.c,v 1.2 2003/04/25 17:23:55 chikama Exp $ */
#include <string.h>
#include "portab.h"
#include "surface.h"
#include "ngraph.h"
#include "ags.h"
/**
* surface ΰ ̤ surface λ֤إԡ
* pixelǡΤߥԡ
*
* @param dst: ž surface
* @param dx: žغɸ
* @param dy: žٺɸ
* @param src: žsurface
* @param sx: žغɸ
* @param sy: žٺɸ
* @param sw: ž
* @param sh: ž⤵
*/
int gr_copy(surface_t *dst, int dx, int dy, surface_t *src, int sx, int sy, int sw, int sh) {
BYTE *sp, *dp;
if (src == NULL || dst == NULL) return NG;
if (!gr_clip(src, &sx, &sy, &sw, &sh, dst, &dx, &dy)) return NG;
sp = GETOFFSET_PIXEL(src, sx, sy);
dp = GETOFFSET_PIXEL(dst, dx, dy);
if (sp == NULL || dp == NULL) return NG;
if (src == dst) {
if (sy <= dy && dy < (sy + sh)) {
sp += (sh -1) * src->bytes_per_line;
dp += (sh -1) * dst->bytes_per_line;
while(sh--) {
memmove(dp, sp, sw * src->bytes_per_pixel);
sp -= src->bytes_per_line;
dp -= dst->bytes_per_line;
}
} else {
while(sh--) {
memmove(dp, sp, sw * src->bytes_per_pixel);
sp += src->bytes_per_line;
dp += dst->bytes_per_line;
}
}
} else {
while(sh--) {
memcpy(dp, sp, sw * src->bytes_per_pixel);
sp += src->bytes_per_line;
dp += dst->bytes_per_line;
}
}
return OK;
}
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