---
name: "DefaultVisualOfScreen"
section: "3x"
platform: "linux"
package: "libx11-dev"
version: "4.3.0.dfsg.1-14sarge7"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/BlackPixelOfScreen/3x"
---

# DefaultVisualOfScreen(3x)

screen information functions and macros

Part of [BlackPixelOfScreen(3x)](/BlackPixelOfScreen/3x.md).

## NAME

BlackPixelOfScreen, WhitePixelOfScreen, CellsOfScreen, DefaultColormapOfScreen, DefaultDepthOfScreen, DefaultGCOfScreen, DefaultVisualOfScreen, DoesBackingStore, DoesSaveUnders, DisplayOfScreen, XScreenNumberOfScreen, EventMaskOfScreen, HeightOfScreen, HeightMMOfScreen, MaxCmapsOfScreen, MinCmapsOfScreen, PlanesOfScreen, RootWindowOfScreen, WidthOfScreen, WidthMMOfScreen - screen information functions and macros

## SYNTAX

unsigned long BlackPixelOfScreen(Screen \**screen*);

unsigned long WhitePixelOfScreen(Screen \**screen*);

int CellsOfScreen(Screen \**screen*);

Colormap DefaultColormapOfScreen(Screen \**screen*);

int DefaultDepthOfScreen(Screen \**screen*);

GC DefaultGCOfScreen(Screen \**screen*);

Visual \*DefaultVisualOfScreen(Screen \**screen*);

int DoesBackingStore(Screen \**screen*);

Bool DoesSaveUnders(Screen \**screen*);

Display \*DisplayOfScreen(Screen \**screen*);

int XScreenNumberOfScreen(Screen \**screen*);

long EventMaskOfScreen(Screen \**screen*);

int HeightOfScreen(Screen \**screen*);

int HeightMMOfScreen(Screen \**screen*);

int MaxCmapsOfScreen(Screen \**screen*);

int MinCmapsOfScreen(Screen \**screen*);

int PlanesOfScreen(Screen \**screen*);

Window RootWindowOfScreen(Screen \**screen*);

int WidthOfScreen(Screen \**screen*);

int WidthMMOfScreen(Screen \**screen*);

## ARGUMENTS

- *screen*

  Specifies the appropriate  *Screen* structure.

## DESCRIPTION

The *BlackPixelOfScreen* macro returns the black pixel value of the specified screen.

The *WhitePixelOfScreen* macro returns the white pixel value of the specified screen.

The *CellsOfScreen* macro returns the number of colormap cells in the default colormap of the specified screen.

The *DefaultColormapOfScreen* macro returns the default colormap of the specified screen.

The *DefaultDepthOfScreen* macro returns the default depth of the root window of the specified screen.

The *DefaultGCOfScreen* macro returns the default GC of the specified screen, which has the same depth as the root window of the screen.

The *DefaultVisualOfScreen* macro returns the default visual of the specified screen.

The *DoesBackingStore* macro returns  *WhenMapped*, *NotUseful*, or *Always*, which indicate whether the screen supports backing stores.

The *DoesSaveUnders* macro returns a Boolean value indicating whether the screen supports save unders.

The *DisplayOfScreen* macro returns the display of the specified screen.

The *XScreenNumberOfScreen* function returns the screen index number of the specified screen.

The *EventMaskOfScreen* macro returns the root event mask of the root window for the specified screen at connection setup.

The *HeightOfScreen* macro returns the height of the specified screen.

The *HeightMMOfScreen* macro returns the height of the specified screen in millimeters.

The *MaxCmapsOfScreen* macro returns the maximum number of installed colormaps supported  by the specified screen.

The *MinCmapsOfScreen* macro returns the minimum number of installed colormaps supported  by the specified screen.

The *PlanesOfScreen* macro returns the number of planes in the root window of the specified screen.

The *RootWindowOfScreen* macro returns the root window of the specified screen.

The *WidthOfScreen* macro returns the width of the specified screen.

The *WidthMMOfScreen* macro returns the width of the specified screen in millimeters.

## SEE ALSO

AllPlanes(3X11), ImageByteOrder(3X11), IsCursorKey(3X11)\
 *Xlib - C Language X Interface*