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/* This file is proposed to be part of the KDE libraries.
* Copyright (C) 2003 Laur Ivan <laurivan@eircom.net>
*
* Many thanks to:
* - Bernardo Hung <deciare@gta.igs.net> for the enhanced shadow
* algorithm (currently used)
* - Tim Jansen <tim@tjansen.de> for the API updates and fixes.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License version 2 as published by the Free Software Foundation.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. 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 KShadowSettings;
/**
* This class implements the shadow algorithm(s). It uses a FxData
* object for its parameters. Note that the shadow algorithm is using the
* luminosity of the original pixmap for the shadow one.
* @see KShadowSettings
* @author laur.ivan@corvil.com
* @since 3.2
*/
class KShadowEngine
{
public:
/// Creates a new shadow engine.
KShadowEngine();
~KShadowEngine();
/**
* Creates a new shadow engine.
* @param fx the shadow settings object with the configuration. The Shadow
* Engine will own this object and also delete it. Must
* be heap-allocated
*/
KShadowEngine(KShadowSettings *fx);
/**
* Set the KShadowSettings object.
* @param fx the shadow settings object with the configuration. The Shadow
* Engine will own this object and also delete it. Must
* be heap-allocated.
*/
void setShadowSettings(KShadowSettings *fx);
/**
* Get the current KShadowSettings.
* @param the current shadow settings
*/
KShadowSettings *shadowSettings();
/**
* Make shadow!
*
* textPixmap is the original pixmap where a (white) text is drawn.
* bgColor is the color used for the shadow.
* @param textPixmap the pixmap of the text
* @param bgColor the background color
* @return the resulting image
*/
TQImage makeShadow(const TQPixmap& textPixmap, const TQColor &bgColor);
private:
// No static objects in libs, and no static deleters in tdefx...
//static KShadowSettings s_defaultShadowSettings;
KShadowSettings *m_shadowSettings;
/*
* a simple algorithm with 3 pixels thickness
*/
double defaultDecay(TQImage& source, int x, int y);
/*
* a slower algorithm where the influence of a pixel
* is tqGray(px)/(abs(dx) + abs(dy) +1).
*/
double doubleLinearDecay(TQImage& source, int x, int y);
/*
* a very slow algorithm where the influence of a pixel
* is tqGray(px)/(sqrt(sqr(dx) + sqr(dy)) +1).
*/
double radialDecay(TQImage& source, int x, int y);
/*
* a nice/fast algorithm proposed by Bernardo Hung
*/
double noDecay(TQImage& source, int x, int y);
void *d;
};
#endif
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