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/*
* This file is part of the KDE libraries
* Copyright (C) 1998 Mark Donohoe <donohoe@kde.org>
* Stephan Kulow <coolo@kde.org>
*
* $Id$
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __KPIXMAP_H__
#define __KPIXMAP_H__
#include <qpixmap.h>
#include <kdelibs_export.h>
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 $Id$
*/
class KDEFX_EXPORT KPixmap : public QPixmap
{
public:
/**
* This enumeration provides a color pallete specification
* @see KPixmap::convertFromImage(), KPixmap::load()
*/
enum ColorMode { Auto, //!< Convert to monochrome if possible
Color, //!< Native display depth
Mono, //!< Monochrome pixmap
LowColor, //!< 3x3x3 color cube (or monochrome)
WebColor //!< Netscape pallete (or monochrome)
};
/**
* This enumeration provides a gradient mode specification
*/
enum GradientMode { Horizontal,
Vertical,
Diagonal,
CrossDiagonal
};
/**
* Constructs a null pixmap.
*/
KPixmap() : QPixmap() {};
/**
* Destructs the pixmap.
* ### KDE 4: remove
*/
~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 colors 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.
*
* @param img the image to convert
* @param conversion_flags bitmask, described above
* @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.
* @param img the image to convert
* @param mode a ColorMode to apply
* @return @p true if successful.
**/
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.
*
* The QImageIO documentation lists the supported image
* formats and explains how to add extra formats.
*
* @param fileName the name of the file to load the image from
* @param format the format for the image
* @param conversion_flags a bitmask, as described in
* convertFromImage()
* @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.
* @param fileName the name of the file to load the image from
* @param format the format for the image
* @param mode a ColorMode to apply
* @return @p true if successful, or false if the pixmap
* could not be loaded.
**/
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.
* @param image the image to test
**/
bool checkColorTable(const QImage &image);
private:
KPixmapPrivate *d;
};
#endif
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