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diff --git a/kolourpaint/pixmapfx/kpeffectinvert.h b/kolourpaint/pixmapfx/kpeffectinvert.h
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+++ b/kolourpaint/pixmapfx/kpeffectinvert.h
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+
+/*
+   Copyright (c) 2003,2004,2005 Clarence Dang <[email protected]>
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+   THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef KP_EFFECT_INVERT_H
+#define KP_EFFECT_INVERT_H
+
+
+#include <kpcoloreffect.h>
+
+
+class QCheckBox;
+class QImage;
+
+class kpMainWindow;
+
+
+class kpEffectInvertCommand : public kpColorEffectCommand
+{
+public:
+    enum Channel
+    {
+        None = 0,
+        Red = 1, Green = 2, Blue = 4,
+        RGB = Red | Green | Blue
+    };
+
+    kpEffectInvertCommand (int channels,
+                           bool actOnSelection,
+                           kpMainWindow *mainWindow);
+    kpEffectInvertCommand (bool actOnSelection,
+                           kpMainWindow *mainWindow);
+    virtual ~kpEffectInvertCommand ();
+
+
+    //
+    // Inverts the colours of each pixel in the given image.
+    // These functions differ from QImage::invertPixels() in the following ways:
+    //
+    // 1. for 8-bit images, it inverts the colours of the Colour Table
+    //    (this means that you would get visually similar results to inversion
+    //     at higher bit depths - rather than a "random-looking" inversion
+    //     depending on the contents of the Colour Table)
+    // 2. never inverts the Alpha Buffer
+    //
+
+    static void apply (QPixmap *destPixmapPtr, int channels = RGB);
+    static QPixmap apply (const QPixmap &pm, int channels = RGB);
+    static void apply (QImage *destImagePtr, int channels = RGB);
+    static QImage apply (const QImage &img, int channels = RGB);
+
+
+    //
+    // kpColorEffectCommand interface
+    //
+
+public:
+    virtual bool isInvertible () const { return true; }
+
+protected:
+    virtual QPixmap applyColorEffect (const QPixmap &pixmap);
+
+    int m_channels;
+};
+
+
+class kpEffectInvertWidget : public kpColorEffectWidget
+{
+Q_OBJECT
+
+public:
+    kpEffectInvertWidget (bool actOnSelection,
+                          kpMainWindow *mainWindow,
+                          QWidget *parent, const char *name = 0);
+    virtual ~kpEffectInvertWidget ();
+
+
+    int channels () const;
+
+
+    //
+    // kpColorEffectWidget interface
+    //
+
+    virtual QString caption () const;
+
+    virtual bool isNoOp () const;
+    virtual QPixmap applyColorEffect (const QPixmap &pixmap);
+
+    virtual kpColorEffectCommand *createCommand () const;
+
+protected slots:
+    void slotRGBCheckBoxToggled ();
+    void slotAllCheckBoxToggled ();
+
+protected:
+    QCheckBox *m_redCheckBox, *m_greenCheckBox, *m_blueCheckBox,
+              *m_allCheckBox;
+
+    // blockSignals() didn't seem to work
+    bool m_inSignalHandler;
+};
+
+
+
+#endif  // KP_EFFECT_INVERT_H