QColormap Class Reference
The QColormap class maps device independent QColors to device dependent pixel values. More...
#include <QColormap>
Public Types
| enum | Mode { Direct, Indexed, Gray } |
Public Functions
| QColormap ( const QColormap & colormap ) | |
| ~QColormap () | |
| const QColor | colorAt ( uint pixel ) const |
| const QVector<QColor> | colormap () const |
| int | depth () const |
| Mode | mode () const |
| uint | pixel ( const QColor & color ) const |
| int | size () const |
| QColormap & | operator= ( const QColormap & colormap ) |
Static Public Members
| HPALETTE | hPal () |
| QColormap | instance ( int screen = -1 ) |
Detailed Description
The QColormap class maps device independent QColors to device dependent pixel values.
Member Type Documentation
enum QColormap::Mode
This enum describes how QColormap maps device independent RGB values to device dependent pixel values.
| Constant | Value | Description |
|---|---|---|
| QColormap::Direct | 0 | Pixel values are derived directly from the RGB values, also known as "True Color." |
| QColormap::Indexed | 1 | Pixel values represent indexes into a vector of available colors, i.e. QColormap uses the index of the color that most closely matches an RGB value. |
| QColormap::Gray | 2 | Similar to Indexed, pixel values represent a vector of available gray tones. QColormap uses the index of the gray tone that most closely matches the computed gray tone of an RGB value. |
Member Function Documentation
QColormap::QColormap ( const QColormap & colormap )
Constructs a copy of another colormap.
QColormap::~QColormap ()
Destroys the colormap.
const QColor QColormap::colorAt ( uint pixel ) const
Returns a QColor for the pixel.
See also pixel().
const QVector<QColor> QColormap::colormap () const
Returns a vector of colors which represents the devices colormap for Indexed and Gray modes. This function returns an empty vector for Direct mode.
See also size().
int QColormap::depth () const
Returns the depth of the device.
See also size().
HPALETTE QColormap::hPal () [static]
This function is only available on Windows.
Returns an handle to the HPALETTE used by this colormap. If no HPALETTE is being used, this function returns zero.
QColormap QColormap::instance ( int screen = -1 ) [static]
Returns the colormap for the specified screen. If screen is -1, this function returns the colormap for the default screen.
Mode QColormap::mode () const
Returns the mode of this colormap.
See also QColormap::Mode.
uint QColormap::pixel ( const QColor & color ) const
Returns a device dependent pixel value for the color.
See also colorAt().
int QColormap::size () const
Returns the size of the colormap for Indexed and Gray modes; Returns -1 for Direct mode.
See also colormap().
QColormap & QColormap::operator= ( const QColormap & colormap )
Assigns the given colormap to this color map and returns a reference to this color map.
This function was introduced in Qt 4.2.
No notes