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114 lines
3.2 KiB
114 lines
3.2 KiB
15 years ago
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/* This file is proposed to be part of the KDE libraries.
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* Copyright (C) 2003 Laur Ivan <laurivan@eircom.net>
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*
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* Many thanks to:
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* - Bernardo Hung <deciare@gta.igs.net> for the enhanced shadow
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* algorithm (currently used)
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* - Tim Jansen <tim@tjansen.de> for the API updates and fixes.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License version 2 as published by the Free Software Foundation.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __FX_SHADOW
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#define __FX_SHADOW
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#include <qpixmap.h>
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#include <qimage.h>
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#include <qcolor.h>
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class KShadowSettings;
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/**
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* This class implements the shadow algorithm(s). It uses a FxData
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* object for its parameters. Note that the shadow algorithm is using the
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* luminosity of the original pixmap for the shadow one.
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* @see KShadowSettings
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* @author laur.ivan@corvil.com
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* @since 3.2
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*/
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class KShadowEngine
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{
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public:
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/// Creates a new shadow engine.
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KShadowEngine();
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~KShadowEngine();
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/**
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* Creates a new shadow engine.
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* @param fx the shadow settings object with the configuration. The Shadow
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* Engine will own this object and also delete it. Must
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* be heap-allocated
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*/
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KShadowEngine(KShadowSettings *fx);
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/**
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* Set the KShadowSettings object.
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* @param fx the shadow settings object with the configuration. The Shadow
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* Engine will own this object and also delete it. Must
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* be heap-allocated.
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*/
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void setShadowSettings(KShadowSettings *fx);
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/**
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* Get the current KShadowSettings.
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* @param the current shadow settings
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*/
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KShadowSettings *shadowSettings();
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/**
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* Make shadow!
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*
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* textPixmap is the original pixmap where a (white) text is drawn.
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* bgColor is the color used for the shadow.
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* @param textPixmap the pixmap of the text
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* @param bgColor the background color
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* @return the resulting image
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*/
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QImage makeShadow(const QPixmap& textPixmap, const QColor &bgColor);
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private:
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// No static objects in libs, and no static deleters in kdefx...
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//static KShadowSettings s_defaultShadowSettings;
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KShadowSettings *m_shadowSettings;
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/*
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* a simple algorithm with 3 pixels thickness
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*/
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double defaultDecay(QImage& source, int x, int y);
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/*
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* a slower algorithm where the influence of a pixel
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* is qGray(px)/(abs(dx) + abs(dy) +1).
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*/
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double doubleLinearDecay(QImage& source, int x, int y);
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/*
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* a very slow algorithm where the influence of a pixel
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* is qGray(px)/(sqrt(sqr(dx) + sqr(dy)) +1).
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*/
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double radialDecay(QImage& source, int x, int y);
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/*
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* a nice/fast algorithm proposed by Bernardo Hung
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*/
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double noDecay(QImage& source, int x, int y);
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void *d;
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};
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#endif
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