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https://github.com/libretro/scummvm.git
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101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/util.h"
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#include "gob/backbuffer.h"
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#include "gob/surface.h"
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namespace Gob {
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BackBuffer::BackBuffer() : _background(0), _saved(false) {
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}
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BackBuffer::~BackBuffer() {
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delete _background;
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}
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bool BackBuffer::hasBuffer() const {
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return _background != 0;
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}
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bool BackBuffer::hasSavedBackground() const {
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return _saved;
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}
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void BackBuffer::trashBuffer() {
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_saved = false;
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}
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void BackBuffer::resizeBuffer(uint16 width, uint16 height) {
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trashBuffer();
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if (_background && (_background->getWidth() == width) && (_background->getHeight() == height))
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return;
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delete _background;
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_background = new Surface(width, height, 1);
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}
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bool BackBuffer::saveScreen(const Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom) {
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if (!_background)
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return false;
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const int16 width = MIN<int16>(right - left + 1, _background->getWidth ());
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const int16 height = MIN<int16>(bottom - top + 1, _background->getHeight());
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if ((width <= 0) || (height <= 0))
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return false;
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right = left + width - 1;
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bottom = top + height - 1;
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_saveLeft = left;
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_saveTop = top;
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_saveRight = right;
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_saveBottom = bottom;
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_background->blit(dest, _saveLeft, _saveTop, _saveRight, _saveBottom, 0, 0);
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_saved = true;
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return true;
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}
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bool BackBuffer::restoreScreen(Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom) {
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if (!_saved)
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return false;
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left = _saveLeft;
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top = _saveTop;
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right = _saveRight;
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bottom = _saveBottom;
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dest.blit(*_background, 0, 0, right - left, bottom - top, left, top);
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_saved = false;
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return true;
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}
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} // End of namespace Gob
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