Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

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