KDE 3.5 API Reference kdefx
KPixmap Class Reference
Off-screen paint device with extended features. More...
#include <kpixmap.h>
Public Types | |
| enum | ColorMode { Auto, Color, Mono, LowColor, WebColor } |
| enum | GradientMode { Horizontal, Vertical, Diagonal, CrossDiagonal } |
Public Member Functions | |
| bool | checkColorTable (const QImage &image) |
| bool | convertFromImage (const QImage &img, ColorMode mode=WebColor) |
| bool | convertFromImage (const QImage &img, int conversion_flags) |
| KPixmap (const QPixmap &pix) | |
| KPixmap () | |
| bool | load (const QString &fileName, const char *format=0, ColorMode mode=WebColor) |
| bool | load (const QString &fileName, const char *format, int conversion_flags) |
| ~KPixmap () | |
Detailed Description
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.
- Version:
- Id
- kpixmap.h 465272 2005-09-29 09:47:40Z mueller
Definition at line 57 of file kpixmap.h.
Member Enumeration Documentation
This enumeration provides a color pallete specification.
- See also:
- KPixmap::convertFromImage(), KPixmap::load()
Constructor & Destructor Documentation
| KPixmap::~KPixmap | ( | ) |
| KPixmap::KPixmap | ( | const QPixmap & | pix | ) |
Member Function Documentation
| bool KPixmap::checkColorTable | ( | const QImage & | image | ) |
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.
- Parameters:
-
image the image to test
Definition at line 291 of file kpixmap.cpp.
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it accepts.
- Parameters:
-
img the image to convert mode a ColorMode to apply
- Returns:
trueif successful.
Definition at line 201 of file kpixmap.cpp.
| bool KPixmap::convertFromImage | ( | const QImage & | img, | |
| int | conversion_flags | |||
| ) |
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
- 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.
- 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.
- AutoColor (default) - If the image has depth 1 and contains only black and white pixels, then the pixmap becomes monochrome.
- ColorOnly - The pixmap is dithered/converted to the native display depth.
- MonoOnly - The pixmap becomes monochrome. If necessary, it is dithered using the chosen dithering algorithm.
- DiffuseDither (default) - A high quality dither.
- OrderedDither - A faster more ordered dither.
- ThresholdDither - No dithering, closest color is used.
- DiffuseAlphaDither - A high quality dither.
- OrderedAlphaDither - A faster more ordered dither.
- ThresholdAlphaDither (default) - No dithering.
- PreferDither - Always dither 32-bit images when the image is being converted to 8-bits. This is the default when converting to a pixmap.
- 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.
conversion_flags gives all the default options.
- Parameters:
-
img the image to convert conversion_flags bitmask, described above
- Returns:
trueif successful.
Reimplemented from QPixmap.
Definition at line 223 of file kpixmap.cpp.
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it accepts.
- Parameters:
-
fileName the name of the file to load the image from format the format for the image mode a ColorMode to apply
- Returns:
trueif successful, or false if the pixmap could not be loaded.
Definition at line 178 of file kpixmap.cpp.
| bool KPixmap::load | ( | const QString & | fileName, | |
| const char * | format, | |||
| int | conversion_flags | |||
| ) |
Loads a pixmap from the file 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.
- Parameters:
-
fileName the name of the file to load the image from format the format for the image conversion_flags a bitmask, as described in convertFromImage()
- Returns:
trueif successful, or false if the pixmap could not be loaded.
Reimplemented from QPixmap.
Definition at line 164 of file kpixmap.cpp.
The documentation for this class was generated from the following files:
