Plasma::ImageEffects namespace. Add shadowBlur and shadowText functions.

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=827065

CMakeLists.txt

@@ -39,6 +39,7 @@ set(plasma_LIB_SRCS
     dialog.cpp
     #FOR FUTURE
     #layouts/borderlayout.cpp
+    imageeffects.cpp
     packages.cpp
     panelsvg.cpp
     paneltoolbox.cpp
@@ -127,6 +128,7 @@ set(plasma_LIB_INCLUDES
     dataenginemanager.h
     delegate.h
     dialog.h
+    imageeffects.h
     panelsvg.h
     plasma.h
     plasma_export.h
@@ -200,6 +202,7 @@ includes/Dialog
 includes/Flash
 includes/GroupBox
 includes/Icon
+includes/ImageEffects
 includes/Label
 includes/LineEdit
 includes/Meter

imageeffects.cpp

@@ -0,0 +1,82 @@
+/*
+ *   Copyright 2005 by Aaron Seigo <aseigo@kde.org>
+ *   Copyright 2008 by Andrew Lake <jamboarder@yahoo.com>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Library General Public License as
+ *   published by the Free Software Foundation; either version 2, 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 Library General Public
+ *   License along with this program; if not, write to the
+ *   Free Software Foundation, Inc.,
+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <imageeffects.h>
+#include "effects/blur.cpp"
+#include <QImage>
+#include <QPainter>
+#include <QPixmap>
+
+namespace Plasma
+{
+    
+namespace ImageEffects
+{
+
+void shadowBlur(QImage &image, int radius, const QColor &color)
+{
+    if (radius < 1)
+        return;
+
+    expblur<16, 7>(image, radius);
+
+    QPainter p(&image);
+    p.setCompositionMode(QPainter::CompositionMode_SourceIn);
+    p.fillRect(image.rect(), color);
+}
+
+QPixmap shadowText(QString text, QColor textColor, QColor shadowColor, QPoint offset, int radius)
+{
+    // Draw text 
+    QPixmap pixmap(10,10);
+    QPainter p(&pixmap);
+    QRect textRect = p.fontMetrics().boundingRect(text);
+    p.end();
+    QPixmap textPixmap(textRect.size());
+    textPixmap.fill(Qt::transparent);
+    p.begin(&textPixmap);
+    p.setPen(textColor);
+    p.drawText(textPixmap.rect(), Qt::AlignLeft, text);
+    p.end();
+
+    //Draw blurred shadow
+    QImage img(textRect.size() + QSize(radius * 2, radius * 2),
+    QImage::Format_ARGB32_Premultiplied);
+    img.fill(Qt::transparent);
+    p.begin(&img);
+    p.drawImage(QPoint(0,0), textPixmap.toImage());
+    p.end();
+    shadowBlur(img, radius, shadowColor);
+
+    //Compose text and shadow
+    QPixmap finalPixmap(img.size() + QSize(offset.x(), offset.y()));
+    finalPixmap.fill(Qt::transparent);
+    p.begin(&finalPixmap);
+    p.drawImage(finalPixmap.rect().topLeft() + QPoint(offset.x(), offset.y()), img);
+    p.drawPixmap(finalPixmap.rect().topLeft(), textPixmap);
+    p.end();
+
+    return finalPixmap;
+}
+
+} //ImageEffects namespace
+
+} // Plasma namespace
+

imageeffects.h

@@ -0,0 +1,59 @@
+
+/*
+ *   Copyright 2005 by Aaron Seigo <aseigo@kde.org>
+ *   Copyright 2008 by Andrew Lake <jamboarder@yahoo.com>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Library General Public License as
+ *   published by the Free Software Foundation; either version 2, 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 Library General Public
+ *   License along with this program; if not, write to the
+ *   Free Software Foundation, Inc.,
+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef IMAGEEFFECTS_H
+#define IMAGEEFFECTS_H
+
+#include <QtGui/QGraphicsItem>
+#include <QtGui/QPainterPath>
+
+#include <plasma/plasma_export.h>
+#include "theme.h"
+
+namespace Plasma
+{
+
+/**
+ *  Namespace for all Image Effects specific to Plasma
+ **/
+namespace ImageEffects
+{
+
+/**
+ * Creates a blurred shadow of the supplied image.
+ */
+PLASMA_EXPORT void shadowBlur(QImage &image, int radius, const QColor &color);
+
+/**
+ * Returns a pixmap containing text with blurred shadow.
+ * Text and shadow colors default to Plasma::Theme colors.
+ */
+PLASMA_EXPORT QPixmap shadowText(QString text, 
+    QColor textColor = Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor), 
+    QColor shadowColor = Plasma::Theme::defaultTheme()->color(Plasma::Theme::BackgroundColor), 
+    QPoint offset = QPoint(1,1), 
+    int radius = 2);
+ 
+} // ImageEffects namespace
+
+} // Plasma namespace
+
+#endif