mirror of
https://github.com/libretro/scummvm.git
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74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2004 The ScummVM project
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*
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* The ReInherit Engine is (C)2000-2003 by Daniel Balsom.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* 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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* $Header$
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*
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*/
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//Background transition routines
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#include "saga/saga.h"
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namespace Saga {
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/*! @brief dissolve one image with another
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@param flags if set to 1, do zero masking
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*/
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int SagaEngine::transitionDissolve(byte *dst_img, int dst_w, int dst_h, int dst_p, const byte *src_img,
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int src_w, int src_h, int src_p, int flags, int x, int y,
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double percent) {
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#define XOR_MASK 0xB400;
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int pixelcount = dst_w * dst_h;
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int seqlimit = (int)(65535 * percent);
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int seq = 1;
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int i, x1, y1;
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Common::Rect clip(x, y, x+src_w, y+src_h);
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byte color;
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for (i = 0; i < seqlimit; i++) {
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if (seq & 1) {
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seq = (seq >> 1) ^ XOR_MASK;
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} else {
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seq = seq >> 1;
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}
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if (seq == 1) {
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return 0;
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}
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if (seq >= pixelcount) {
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continue;
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} else {
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x1 = seq % dst_w;
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y1 = seq / dst_w;
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if (clip.contains(x1, y1)) {
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color = src_img[(x1-x)+src_w*(y1-y)];
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if (flags == 0 || color)
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dst_img[seq] = color;
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}
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}
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}
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return 1;
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}
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} // End of namespace Saga
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