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Under GNU General Public License
2012-05-25 12:51 @38.107.179.239 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
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 argu-
ment 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 corresponds 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 dou-
ble-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(), XdbeGetBackBufferAttributes(), XdbeQueryExtension(),
XdbeSwapBuffers().
X Version 11 libXext 1.0.4 XdbeGetVisualInfo(3)
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On Apache
Under GNU General Public License
2012-05-25 12:51 @38.107.179.239 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)