XdbeFreeVisualInfo(3) X FUNCTIONS XdbeFreeVisualInfo(3)NAME
XdbeFreeVisualInfo - frees information returned by XdbeGetVisualInfo().
SYNOPSIS
#include <X11/extensions/Xdbe.h>
void XdbeFreeVisualInfo(
XdbeScreenVisualInfo *visual_info)
DESCRIPTION
This function frees the list of XdbeScreenVisualInfo returned by the function XdbeGetVisualInfo().
SEE ALSO
DBE, XdbeAllocateBackBufferName(), XdbeBeginIdiom(), XdbeDeallocateBackBufferName(), XdbeEndIdiom(), XdbeGetBackBufferAttributes(),
XdbeGetVisualInfo(), XdbeQueryExtension(), XdbeSwapBuffers().
X Version 11 libXext 1.3.1 XdbeFreeVisualInfo(3)
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XdbeGetVisualInfo(3) X FUNCTIONS XdbeGetVisualInfo(3)NAME
XdbeGetVisualInfo - Get dbe Visual Informations
SYNOPSIS
#include <X11/extensions/Xdbe.h>
XdbeScreenVisualInfo *XdbeGetVisualInfo(
Display *dpy,
Drawable *screen_specifiers,
int *num_screens)
DESCRIPTION
This function returns information about which visuals support double buffering. The argument num_screens specifies how many elements there
are in the screen_specifiers list. Each drawable in screen_specifiers designates a screen for which the supported visuals are being
requested. If num_screens is zero, information for all screens is requested. In this case, upon return from this function, num_screens
will be set to the number of screens that were found. If an error occurs, this function returns NULL, else it returns a pointer to a list
of XdbeScreenVisualInfo structures of length num_screens. The nth element in the returned list corresponds to the nth drawable in the
screen_specifiers list, unless num_screens was passed in with the value zero, in which case the nth element in the returned list corre-
sponds to the nth screen of the server, starting with screen zero. The XdbeScreenVisualInfo structure has the following fields:
int count
XdbeVisualInfo *visinfo
count specifies the number of items in visinfo. visinfo specifies a list of visuals, depths, and performance hints for this screen.
The XdbeVisualInfo structure has the following fields:
VisualID visual
int depth
int perflevel
visual specifies one visual ID that supports double-buffering. depth specifies the depth of the visual. perflevel is a performance hint.
The only operation defined on a perflevel is comparison to a perflevel of another visual on the same screen. The visual having the higher
perflevel is likely to have better double-buffering graphics performance than the visual having the lower perflevel. Nothing can be
deduced from the following: the magnitude of the difference of two perflevels, a perflevel value in isolation, or comparing perflevels from
different servers.
ERRORS
BadDrawable
One or more values passed in screen_specifiers is not a valid drawable.
SEE ALSO
DBE, XdbeAllocateBackBufferName(), XdbeBeginIdiom(), XdbeDeallocateBackBufferName(), XdbeEndIdiom(), XdbeFreeVisualInfo(), XdbeGetBack-
BufferAttributes(), XdbeQueryExtension(), XdbeSwapBuffers().
X Version 11 libXext 1.3.1 XdbeGetVisualInfo(3)
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