mirror of
https://github.com/kichikuou/xsystem35-sdl2.git
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86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*
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* graph_copy_amap.c alpha map のコピー
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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: graph_copy_amap.c,v 1.2 2003/04/25 17:23:55 chikama Exp $ */
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#include <string.h>
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#include "portab.h"
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#include "system.h"
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#include "surface.h"
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#include "ngraph.h"
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#include "ags.h"
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/**
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* 指定の surface の alphamap を別の surface の指定領域にコピーする
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*
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* @param dst: 転送先 surface
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* @param dx: 転送先Ｘ座標
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* @param dy: 転送先Ｙ座標
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* @param src: 転送元surface
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* @param sx: 転送元Ｘ座標
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* @param sy: 転送元Ｙ座標
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* @param sw: 転送幅
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* @param sh: 転送高さ
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*/
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void gr_copy_alpha_map(surface_t *dst, int dx, int dy, surface_t *src, int sx, int sy, int sw, int sh) {
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uint8_t *sp, *dp;
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if (!gr_clip(src, &sx, &sy, &sw, &sh, dst, &dx, &dy)) return;
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sp = GETOFFSET_ALPHA(src, sx, sy);
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dp = GETOFFSET_ALPHA(dst, dx, dy);
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if (sp == NULL) {
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WARNING("src alpha NULL");
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return;
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}
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if (dp == NULL) {
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WARNING("dst alpha NULL");
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return;
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}
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if (src == dst) {
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if (sy <= dy && dy < (sy + sh)) {
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sp += (sh -1) * src->width;
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dp += (sh -1) * dst->width;
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while(sh--) {
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memmove(dp, sp, sw);
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sp -= src->width;
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dp -= dst->width;
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}
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} else {
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while(sh--) {
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memmove(dp, sp, sw);
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sp += src->width;
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dp += dst->width;
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}
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}
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} else {
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while(sh--) {
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memcpy(dp, sp, sw);
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sp += src->width;
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dp += dst->width;
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}
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}
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}
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