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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "darkseed/morph.h"
#include "darkseed/darkseed.h"
namespace Darkseed {
Morph::Morph(const Common::Rect &area) : _area(area) {}
void Morph::loadSrcFromScreen() {
_src.copyFrom(*(Graphics::ManagedSurface *)g_engine->_screen);
}
void Morph::loadDestFromScreen() {
_dest.copyFrom(*(Graphics::ManagedSurface *)g_engine->_screen);
}
void Morph::start(MorphDirection direction) {
_stepCount = 0;
_direction = direction;
}
bool Morph::morphStep() {
if (_stepCount > 16) {
return false;
}
draw(_direction == MorphDirection::Forward ? _stepCount : 16 - _stepCount);
_stepCount += 1;
return _stepCount < 17;
}
void Morph::draw(int16 drawIdx) {
uint8 *screen = (uint8 *)g_engine->_screen->getBasePtr(_area.left, _area.top);
uint8 *src = (uint8 *)_src.getBasePtr(_area.left, _area.top);
uint8 *dest = (uint8 *)_dest.getBasePtr(_area.left, _area.top);
for (int y = 0; y < _area.height(); y++) {
for (int x = 0; x < _area.width(); x++) {
if (src[x] != dest[x]) {
screen[x] = (src[x] * (16 - drawIdx) + dest[x] * drawIdx) >> 4;
}
}
screen += g_engine->_screen->pitch;
src += _src.pitch;
dest += _dest.pitch;
}
g_engine->_screen->addDirtyRect(_area);
}
} // End of namespace Darkseed
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