Definition | #include <kpixmap.h> |
Inherits | QPixmap |
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Public Types
- enum ColorMode {Auto, Color, Mono, LowColor, WebColor }
- enum GradientMode {Horizontal, Vertical, Diagonal, CrossDiagonal }
Public Methods
- KPixmap () : QPixmap()
- ~ KPixmap ()
- KPixmap (const QPixmap& pix)
- bool convertFromImage ( const QImage &img, int conversion_flags )
- bool convertFromImage ( const QImage &img, ColorMode mode = WebColor )
- bool load ( const QString& fileName, const char *format, int conversion_flags )
- bool load ( const QString& fileName, const char *format = 0, ColorMode mode = WebColor )
- bool checkColorTable (const QImage &image)
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.
enum ColorMode {Auto, Color, Mono, LowColor, WebColor }
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enum GradientMode {Horizontal, Vertical, Diagonal, CrossDiagonal }
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Create a null pixmap.
Destroy the pixmap.
KPixmap (const QPixmap& pix)
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Copy the QPixmap pix.
bool convertFromImage ( const QImage &img, int conversion_flags )
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Convert 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.
Dithering mode preference, for RGB channels
- DiffuseDither (default) - A high quality dither.
- OrderedDither - A faster more ordered dither.
- ThresholdDither - No dithering, closest color is used.
Dithering mode preference, for alpha channel
- DiffuseAlphaDither - A high quality dither.
- OrderedAlphaDither - A faster more ordered dither.
- ThresholdAlphaDither (default) - No dithering.
Color matching versus dithering preference
- 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 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 conversion_flags
gives all the default
options.
Returns: true
if successful.
bool convertFromImage ( const QImage &img, ColorMode mode = WebColor )
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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, int conversion_flags )
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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.
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.
Returns: true
if successful, or false if the pixmap
could not be loaded.
bool load ( const QString& fileName, const char *format = 0, ColorMode mode = WebColor )
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This is an overloaded member function, provided for
convenience. It differs from the above function only in
what argument(s) it accepts.
bool checkColorTable (const QImage &image)
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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.