home *** CD-ROM | disk | FTP | other *** search
- /* This file is part of the KDE libraries
- Copyright (C) 1998 Mark Donohoe <donohoe@kde.org>
- Stephan Kulow
-
- 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 <qpixmap.h>
-
- const int KColorMode_Mask = 0x00000300;
- const int WebOnly = 0x00000200;
- const int LowOnly = 0x00000300;
-
- /**
- * The KPixmap class is an off-screen buffer paint device that extends the
- * features of QPixmap.
- *
- * 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.
- *
- */
- class KPixmap : public QPixmap
- {
- public:
- enum ColorMode { Auto, Color, Mono, LowColor, WebColor };
-
- /**
- * Creates a null pixmap
- */
- KPixmap() {};
-
- /**
- * Destroys the pixmap.
- */
- ~KPixmap() {};
-
- /**
- * Fills the pixmap with a color blend running from color ca to color cb.
- *
- * If upDown is TRUE the blend will run from the top to the bottom of the
- * pixmap. If upDown is FALSE the blend will run from the right to the left
- * of the pixmap.
- *
- * By default, the blend will use 3 colors on 8 bpp displays,
- * 32 colors on 16 bpp displays and unlimited colors at higher dislay
- * depths. For 8bpp displays ncols specifies an alternative number of colors
- * to use. The greater the number of colors allocated the better the
- * appearance of the gradient but the longer it takes to make.
- */
- void gradientFill( QColor ca, QColor cb, bool upDown = TRUE, int ncols = 3 );
-
- /**
- * Fills the pixmap with a two color pattern, specified by the pattern bits
- * in pattern[], the color ca to be used for the background and the color cb
- * to be used for the foreground.
- */
- void patternFill( QColor ca, QColor cb, uint pattern[8] );
-
- /**
- * Converts an image and sets this pixmap. Returns TRUE if
- * successful.
- *
- * 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
- *
- * <itemize>
- * <item>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.
- * <item>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.
- * <item>AutoColor (default) - If the image has depth 1 and contains
- * only black and white pixels, then the pixmap becomes
- * monochrome.
- * <item>ColorOnly - The pixmap is dithered/converted to the native
- * display depth.
- * <item>MonoOnly - The pixmap becomes monochrome. If necessary, it
- * is dithered using the chosen dithering algorithm.
- * </itemize>
- *
- * Dithering mode preference, for RGB channels
- *
- * <itemize>
- * <item>DiffuseDither (default) - a high quality dither
- * <item>OrderedDither - a faster more ordered dither
- * <item>ThresholdDither - no dithering, closest color is used
- * </itemize>
- *
- * Dithering mode preference, for alpha channel
- *
- * <itemize>
- * <item>DiffuseAlphaDither - a high quality dither
- * <item>OrderedAlphaDither - a faster more ordered dither
- * <item>ThresholdAlphaDither (default) - no dithering
- * </itemize>
- *
- * Color matching versus dithering preference
- *
- * <itemize>
- * <item>PreferDither - always dither 32-bit images when the image
- * is being converted to 8-bits. This is the default when
- * converting to a pixmap.
- * <item>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.
- * </itemize>
- *
- * Passing 0 for conversion_flags gives all the default
- * options.
- */
- 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 fileName. Returns TRUE if
- * successful, or FALSE if the pixmap could not be loaded.
- *
- * 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 convertFromImage() documentation for a description
- * of the conversion_flags argument.
- *
- * The QImageIO documentation lists the supported image
- * formats and explains how to add extra formats.
- */
- bool load( const char *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 char *fileName, const char *format = 0,
- ColorMode mode = WebColor );
- /*
- * Returns TRUE of the image is posessed of 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 make a match, since this extra color may be a
- * transparent background.
- */
- bool checkColorTable(const QImage &image);
- };
-
- #endif
-
-