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XdbeGetVisualInfo(3) Library Functions Manual XdbeGetVisualInfo(3) NAME XdbeGetVisualInfo - Get dbe Visual Information 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 re- quested. If num_screens is zero, information for all screens is re- quested. In this case, upon return from this function, num_screens will be set to the number of screens that were found. If an error oc- curs, this function returns NULL, else it returns a pointer to a list of XdbeScreenVisualInfo structures of length num_screens. The nth ele- ment 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 Xdbe- ScreenVisualInfo 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 perfor- mance than the visual having the lower perflevel. Nothing can be de- duced from the following: the magnitude of the difference of two per- flevels, 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(), XdbeDeallocate- BackBufferName(), XdbeEndIdiom(), XdbeFreeVisualInfo(), XdbeGetBack- BufferAttributes(), XdbeQueryExtension(), XdbeSwapBuffers(). X FUNCTIONS X Version 11 XdbeGetVisualInfo(3)