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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/star_control/surface_fader.h"
#include "titanic/star_control/surface_area.h"
#include "titanic/support/screen_manager.h"
#include "titanic/support/video_surface.h"
#include "common/system.h"
#include "graphics/pixelformat.h"
namespace Titanic {
CSurfaceFader::CSurfaceFader() : _index(-1), _count(32), _fadeIn(false), _videoSurface(nullptr) {
_dataP = new byte[_count];
for (int idx = 0; idx < _count; ++idx)
_dataP[idx] = (byte)(pow((double)idx / (double)_count, 1.299999952316284)
* (double)_count + 0.5);
}
CSurfaceFader::~CSurfaceFader() {
delete _videoSurface;
delete[] _dataP;
}
void CSurfaceFader::reset() {
_index = 0;
}
bool CSurfaceFader::setupSurface(CScreenManager *screenManager, CVideoSurface *srcSurface) {
int width = srcSurface->getWidth();
int height = srcSurface->getHeight();
if (_videoSurface) {
if (width == _videoSurface->getWidth() && _videoSurface->getHeight())
// Allocated surface already matches new size
return true;
// Different sizes, so delete old surface
delete _videoSurface;
}
_videoSurface = screenManager->createSurface(width, height);
return true;
}
CVideoSurface *CSurfaceFader::draw(CScreenManager *screenManager, CVideoSurface *srcSurface) {
if (_index < 0 || _index >= _count)
return srcSurface;
// On the first iteration, set up a temporary surface
if (_index == 0 && !setupSurface(screenManager, srcSurface))
return nullptr;
srcSurface->lock();
_videoSurface->lock();
CSurfaceArea srcSurfaceArea(srcSurface);
CSurfaceArea destSurfaceArea(_videoSurface);
// Copy the surface with fading
step(srcSurfaceArea, destSurfaceArea);
srcSurface->unlock();
_videoSurface->unlock();
++_index;
return _videoSurface;
}
void CSurfaceFader::step(CSurfaceArea &srcSurface, CSurfaceArea &destSurface) {
const uint16 *srcPixelP = (const uint16 *)srcSurface._pixelsPtr;
uint16 *destPixelP = (uint16 *)destSurface._pixelsPtr;
// Currently we only support 2 bytes per pixel surfaces
assert(srcSurface._bpp == 2);
byte dataVal = _dataP[_index];
double fraction = (double)dataVal / ((double)(_count - 1));
if (!_fadeIn)
// For fade outs, reverse the percentage visibility
fraction = 1.0 - fraction;
// Iterate through the pixels
byte r, g, b;
Graphics::PixelFormat format = g_system->getScreenFormat();
for (int yp = 0; yp < srcSurface._height; ++yp) {
for (int xp = 0; xp < srcSurface._width; ++xp, ++srcPixelP, ++destPixelP) {
format.colorToRGB(*srcPixelP, r, g, b);
r = (byte)((double)r * fraction);
g = (byte)((double)g * fraction);
b = (byte)((double)b * fraction);
*destPixelP = format.RGBToColor(r, g, b);
}
}
}
void CSurfaceFader::setFadeIn(bool fadeIn) {
_fadeIn = fadeIn;
}
} // End of namespace Titanic
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