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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commitce4a32fe52ef09d8f5ff1dd22c001110902b60a2 (patch)
tree5ac38a06f3dde268dc7927dc155896926aaf7012 /kdefx/kpixmap.h
downloadtdelibs-ce4a32fe52ef09d8f5ff1dd22c001110902b60a2.tar.gz
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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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