diff options
Diffstat (limited to 'kdesktop/kshadowengine.h')
| -rw-r--r-- | kdesktop/kshadowengine.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/kdesktop/kshadowengine.h b/kdesktop/kshadowengine.h new file mode 100644 index 000000000..3649ea3f4 --- /dev/null +++ b/kdesktop/kshadowengine.h @@ -0,0 +1,113 @@ +/* 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 <qpixmap.h> +#include <qimage.h> +#include <qcolor.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 + */ + QImage makeShadow(const QPixmap& textPixmap, const QColor &bgColor); + + private: + // No static objects in libs, and no static deleters in kdefx... + //static KShadowSettings s_defaultShadowSettings; + + KShadowSettings *m_shadowSettings; + + /* + * a simple algorithm with 3 pixels thickness + */ + double defaultDecay(QImage& source, int x, int y); + + /* + * a slower algorithm where the influence of a pixel + * is qGray(px)/(abs(dx) + abs(dy) +1). + */ + double doubleLinearDecay(QImage& source, int x, int y); + + /* + * a very slow algorithm where the influence of a pixel + * is qGray(px)/(sqrt(sqr(dx) + sqr(dy)) +1). + */ + double radialDecay(QImage& source, int x, int y); + + /* + * a nice/fast algorithm proposed by Bernardo Hung + */ + double noDecay(QImage& source, int x, int y); + + void *d; +}; + +#endif |