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123 lines
3.6 KiB
C++
123 lines
3.6 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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*
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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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*
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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 "titanic/star_control/surface_fader.h"
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#include "titanic/star_control/surface_area.h"
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#include "titanic/support/screen_manager.h"
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#include "titanic/support/video_surface.h"
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#include "common/system.h"
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#include "graphics/pixelformat.h"
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namespace Titanic {
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CSurfaceFader::CSurfaceFader() : _index(-1), _count(32), _fadeIn(false), _videoSurface(nullptr) {
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_dataP = new byte[_count];
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for (int idx = 0; idx < _count; ++idx)
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_dataP[idx] = (byte)(pow((double)idx / (double)_count, 1.299999952316284)
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* (double)_count + 0.5);
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}
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CSurfaceFader::~CSurfaceFader() {
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delete _videoSurface;
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delete[] _dataP;
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}
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void CSurfaceFader::reset() {
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_index = 0;
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}
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bool CSurfaceFader::setupSurface(CScreenManager *screenManager, CVideoSurface *srcSurface) {
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int width = srcSurface->getWidth();
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int height = srcSurface->getHeight();
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if (_videoSurface) {
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if (width == _videoSurface->getWidth() && _videoSurface->getHeight())
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// Allocated surface already matches new size
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return true;
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// Different sizes, so delete old surface
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delete _videoSurface;
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}
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_videoSurface = screenManager->createSurface(width, height);
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return true;
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}
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CVideoSurface *CSurfaceFader::draw(CScreenManager *screenManager, CVideoSurface *srcSurface) {
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if (_index < 0 || _index >= _count)
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return srcSurface;
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// On the first iteration, set up a temporary surface
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if (_index == 0 && !setupSurface(screenManager, srcSurface))
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return nullptr;
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srcSurface->lock();
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_videoSurface->lock();
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CSurfaceArea srcSurfaceArea(srcSurface);
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CSurfaceArea destSurfaceArea(_videoSurface);
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// Copy the surface with fading
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step(srcSurfaceArea, destSurfaceArea);
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srcSurface->unlock();
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_videoSurface->unlock();
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++_index;
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return _videoSurface;
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}
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void CSurfaceFader::step(CSurfaceArea &srcSurface, CSurfaceArea &destSurface) {
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const uint16 *srcPixelP = (const uint16 *)srcSurface._pixelsPtr;
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uint16 *destPixelP = (uint16 *)destSurface._pixelsPtr;
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// Currently we only support 2 bytes per pixel surfaces
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assert(srcSurface._bpp == 2);
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byte dataVal = _dataP[_index];
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double fraction = (double)dataVal / ((double)(_count - 1));
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if (!_fadeIn)
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// For fade outs, reverse the percentage visibility
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fraction = 1.0 - fraction;
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// Iterate through the pixels
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byte r, g, b;
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Graphics::PixelFormat format = g_system->getScreenFormat();
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for (int yp = 0; yp < srcSurface._height; ++yp) {
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for (int xp = 0; xp < srcSurface._width; ++xp, ++srcPixelP, ++destPixelP) {
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format.colorToRGB(*srcPixelP, r, g, b);
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r = (byte)((double)r * fraction);
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g = (byte)((double)g * fraction);
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b = (byte)((double)b * fraction);
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*destPixelP = format.RGBToColor(r, g, b);
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}
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}
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}
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void CSurfaceFader::setFadeIn(bool fadeIn) {
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_fadeIn = fadeIn;
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}
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} // End of namespace Titanic
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