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QColormap Class

The QColormap class maps device independent QColors to device dependent pixel values. More...

Header: #include <QColormap>
CMake: find_package(Qt6 REQUIRED COMPONENTS Widgets)
target_link_libraries(mytarget PRIVATE Qt6::Widgets)
qmake: QT += widgets

Public Types

enum Mode { Direct, Indexed, Gray }

Public Functions

QColormap(const QColormap &colormap)
QColormap & operator=(const QColormap &colormap)
const QColor colorAt(uint pixel) const
const QList<QColor> colormap() const
int depth() const
QColormap::Mode mode() const
uint pixel(const QColor &color) const
int size() const

Static Public Members

QColormap instance(int screen = -1)

Detailed Description

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 list 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 list 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::operator=(const QColormap &colormap)

Assigns the given colormap to this color map and returns a reference to this color map.


Destroys the colormap.

const QColor QColormap::colorAt(uint pixel) const

Returns a QColor for the pixel.

See also pixel().

const QList<QColor> QColormap::colormap() const

Returns a list of colors which represents the devices colormap for Indexed and Gray modes. This function returns an empty list for Direct mode.

See also size().

int QColormap::depth() const

Returns the depth of the device.

See also size().

[static] QColormap QColormap::instance(int screen = -1)

Returns the colormap for the specified screen. If screen is -1, this function returns the colormap for the default screen.

QColormap::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().

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