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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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/util.h"
#include "gob/backbuffer.h"
#include "gob/surface.h"
namespace Gob {
BackBuffer::BackBuffer() : _background(0), _saved(false) {
}
BackBuffer::~BackBuffer() {
delete _background;
}
bool BackBuffer::hasBuffer() const {
return _background != 0;
}
bool BackBuffer::hasSavedBackground() const {
return _saved;
}
void BackBuffer::trashBuffer() {
_saved = false;
}
void BackBuffer::resizeBuffer(uint16 width, uint16 height) {
trashBuffer();
if (_background && (_background->getWidth() == width) && (_background->getHeight() == height))
return;
delete _background;
_background = new Surface(width, height, 1);
}
bool BackBuffer::saveScreen(const Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom) {
if (!_background)
return false;
const int16 width = MIN<int16>(right - left + 1, _background->getWidth ());
const int16 height = MIN<int16>(bottom - top + 1, _background->getHeight());
if ((width <= 0) || (height <= 0))
return false;
right = left + width - 1;
bottom = top + height - 1;
_saveLeft = left;
_saveTop = top;
_saveRight = right;
_saveBottom = bottom;
_background->blit(dest, _saveLeft, _saveTop, _saveRight, _saveBottom, 0, 0);
_saved = true;
return true;
}
bool BackBuffer::restoreScreen(Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom) {
if (!_saved)
return false;
left = _saveLeft;
top = _saveTop;
right = _saveRight;
bottom = _saveBottom;
dest.blit(*_background, 0, 0, right - left, bottom - top, left, top);
_saved = false;
return true;
}
} // End of namespace Gob
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