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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 "titanic/support/transparency_surface.h"
#include "common/algorithm.h"
#include "common/textconsole.h"
namespace Titanic {
CTransparencySurface::CTransparencySurface(const Graphics::Surface *surface,
TransparencyMode transMode) : _surface(surface) {
_pitch = 0;
_runLength = 0;
_flag = false;
_opaqueColor = 0;
_transparentColor = 0xff;
switch (transMode) {
case TRANS_MASK0:
case TRANS_ALPHA0:
_transparentColor = 0;
_opaqueColor = 0xff;
break;
case TRANS_MASK255:
case TRANS_ALPHA255:
_transparentColor = 0xff;
_opaqueColor = 0;
break;
case TRANS_DEFAULT:
// If top left pixel is low, then 0 is the transparent color
if (*(const byte *)surface->getPixels() < 0x80) {
_opaqueColor = 0xff;
_transparentColor = 0;
}
break;
default:
break;
}
}
int CTransparencySurface::moveX() {
if (++_pos.x >= _surface->w) {
_pos.x = 0;
++_pos.y;
}
return 1;
}
uint CTransparencySurface::getPixel() const {
byte pixel = *(const byte *)_surface->getBasePtr(_pos.x, _pos.y);
return pixel;
}
uint CTransparencySurface::getAlpha() const {
byte pixel = getPixel();
return _opaqueColor ? 0xFF - pixel : pixel;
}
bool CTransparencySurface::isPixelOpaque() const {
byte pixel = getPixel();
if (_opaqueColor)
return pixel >= 0xf0;
else
return pixel < 0x10;
}
bool CTransparencySurface::isPixelTransparent() const {
byte pixel = getPixel();
if (_transparentColor)
return pixel >= 0xf0;
else
return pixel < 0x10;
}
} // End of namespace Titanic
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