Source: kpixmap.h

# Source: kpixmap.h |
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    /*
     *  This file is part of the KDE libraries
     *  Copyright (C) 1998	Mark Donohoe
     * 			Stephan Kulow
     *
     *  $Id: kpixmap.h,v 1.27 2002/07/31 23:14:10 orlovich Exp $
     *
     *  This library 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 of the License, or (at your option) any later version.
     *
     *  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., 59 Temple Place - Suite 330,
     *  Boston, MA 02111-1307, USA.
     */

    #ifndef __KPIXMAP_H__
    #define __KPIXMAP_H__

    #include

    const int KColorMode_Mask	= 0x00000300;
    const int WebOnly 	= 0x00000200;
    const int LowOnly	= 0x00000300;

    class KPixmapPrivate;

    /**
     * Off-screen paint device with extended features.

     * KPixmap has two new color modes, WebColor and LowColor, applicable
     * to 8bpp displays.

     * In WebColor mode all images are dithered to the Netscape palette,
     * even when they have their own color table. WebColor is the default
     * mode for KPixmap so that standard applications can share the Netscape
     * palette across the desktop.

     * In LowColor mode images are checked to see if their color table
     * matches the KDE icon palette. If the color tables do not match, the
     * images are dithered to a minimal 3x3x3 color cube. LowColor mode can
     * be used to load icons, background images etc. so that components of
     * the desktop which are always present use no more than 40 colors.

     * @author Mark Donohoe (donohoe@kde.org)
     * @version $Id: kpixmap.h,v 1.27 2002/07/31 23:14:10 orlovich Exp $
     */
    class KPixmap : public QPixmap
    {
    public:
            enum ColorMode { Auto, Color, Mono, LowColor, WebColor };
            enum GradientMode { Horizontal, Vertical, Diagonal, CrossDiagonal };

    	/**
    	 * Constructs a null pixmap.
    	 */
             KPixmap() : QPixmap() {};

    	/**
    	 * Destructs the pixmap.
    	 */
    	~KPixmap() {};

    	/**
    	 * Copies the QPixmap @p pix.
             */
    	KPixmap(const QPixmap& pix);

    	/**
    	 * Converts an image and sets this pixmap.
    	 *
    	 * The conversion_flags argument is a bitwise-OR from the
    	 * following choices. The options marked (default) are the
    	 * choice if no other choice from the list is included (they
    	 * are zero):
    	 *
    	 * Color/Mono preference
    	 *
    	 * @li WebColor -  If the image has depth 1 and contains
    	 * only black and white pixels then the pixmap becomes monochrome. If
    	 * the pixmap has a depth of 8 bits per pixel then the Netscape
    	 * palette is used for the pixmap color table.
    	 * @li LowColor - If the image has depth 1 and contains only black and
    	 * white pixels then the pixmap becomes monochrome. If the pixmap has a
    	 * depth of 8 bits per pixel and the image does not posess a color table
    	 * that matches the Icon palette a 3x3x3 color cube is used for the
    	 * pixmap color table.
    	 * @li AutoColor (default) - If the image has depth 1 and contains
    	 * only black and white pixels, then the pixmap becomes
    	 * monochrome.
    	 * @li ColorOnly - The pixmap is dithered/converted to the native
    	 * display depth.
    	 * @li MonoOnly - The pixmap becomes monochrome. If necessary, it
    	 * is dithered using the chosen dithering algorithm.
    	 *
    	 * Dithering mode preference, for RGB channels
    	 *
    	 * @li DiffuseDither (default) - A high quality dither.
    	 * @li OrderedDither - A faster more ordered dither.
    	 * @li ThresholdDither - No dithering, closest color is used.
    	 *
    	 * Dithering mode preference, for alpha channel
    	 *
    	 * @li DiffuseAlphaDither - A high quality dither.
    	 * @li OrderedAlphaDither - A faster more ordered dither.
    	 * @li ThresholdAlphaDither (default) - No dithering.
    	 *
    	 * Color matching versus dithering preference
    	 *
    	 * @li PreferDither - Always dither 32-bit images when the image
    	 * is being converted to 8-bits. This is the default when
    	 * converting to a pixmap.
    	 * @li AvoidDither - Only dither 32-bit images if the image has
    	 * more than 256 colours and it is being converted to 8-bits.
    	 * This is the default when an image is converted for the
    	 * purpose of saving to a file.
    	 *
    	 * Passing 0 for @p conversion_flags gives all the default
    	 * options.
    	 * @return @p true if successful.
    	 **/
    	bool convertFromImage( const QImage &img, int conversion_flags );

    	/**
    	 * This is an overloaded member function, provided for
    	 * convenience. It differs from the above function only in
    	 * what argument(s) it accepts.
    	 **/
    	bool convertFromImage( const QImage &img, ColorMode mode = WebColor );

    	/**
    	 * Loads a pixmap from the file @p fileName.
    	 *
    	 * If format is specified, the loader attempts to read the
    	 * pixmap using the specified format. If format is not
    	 * specified (default), the loader reads a few bytes from the
    	 * header to guess the file format.
    	 *
    	 * See the @ref convertFromImage() documentation for a description
    	 * of the conversion_flags argument.
    	 *
    	 * The @ref QImageIO documentation lists the supported image
    	 * formats and explains how to add extra formats.
    	 *
    	 * @return @p true if successful, or false if the pixmap
    	 *  could not be loaded.
    	 **/
    	bool load( const QString& fileName, const char *format,
    		int conversion_flags );

    	/**
    	 * This is an overloaded member function, provided for
    	 * convenience. It differs from the above function only in
    	 * what argument(s) it accepts.
    	 **/
    	bool load( const QString& fileName,
    		const char *format = 0,
    		ColorMode mode = WebColor );

    	/**
    	 * Returns true if the image posesses a color table that
    	 * matches the Icon palette or false otherwise.
    	 *
    	 * An image with one color not found in the Icon palette is
    	 * considered to be a match, since this extra color may be a
    	 * transparent background.
    	 **/
    	bool checkColorTable(const QImage &image);

    private:
        KPixmapPrivate *d;
    };

    #endif

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