DeKorator 0.3 is a pixmap-based theme engine for TWin with its own themes. DeKorator themes are available via OpenDesktop: https://store.kde.org/browse?cat=118&order=latest
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twin-style-dekorator/client/shadow.h

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///////////////////////////////////////////////////////////////////////
// -------------------
// DeKorator window decoration for KDE
// -------------------
// Copyright (C) 2005 moty rahamim <moty.rahamim@gmail.com>
//
// Based on Example-0.8, some ideas and code have been taken from plastik and KCMicons
//
// Example window decoration for KDE
// Copyright (c) 2003, 2004 David Johnson <david@usermode.org>
//
// Plastik KWin window decoration
// Copyright (C) 2003-2005 Sandro Giessl <sandro@giessl.com>
//
// KCMicons for KDE
// Copyright (c) 2000 Antonio Larrosa <larrosa@kde.org>
//
// 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; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, USA.
///////////////////////////////////////////////////////////////////////
#ifndef __FX_SHADOW
#define __FX_SHADOW
#include <tqpixmap.h>
#include <tqimage.h>
#include <tqcolor.h>
class ShadowEngine
{
public:
ShadowEngine();
~ShadowEngine();
void setThickness(int thickness) { thickness_ = thickness; }
void setMultiplicationFactor(double factor) { multiplicationFactor_ = factor; }
TQImage makeShadow(const TQPixmap& textPixmap, const TQColor &bgColor);
private:
double decay(TQImage& source, int x, int y);
int thickness_;
double multiplicationFactor_;
};
#endif