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IABSD.fr/xenocara/lib/libXext/man/XdbeGetVisualInfo.man
matthieu
- lib/libXext/man/XdbeGetVisualInfo.man
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.\" Copyright (c) 1995 Hewlett-Packard Company .\" .\" Permission is hereby granted, free of charge, to any person obtaining a .\" copy of this software and associated documentation files (the "Software"), .\" to deal in the Software without restriction, including without limitation .\" the rights to use, copy, modify, merge, publish, distribute, sublicense, .\" and/or sell copies of the Software, and to permit persons to whom the .\" Software furnished to do so, subject to the following conditions: .\" .\" The above copyright notice and this permission notice shall be included in .\" all copies or substantial portions of the Software. .\" .\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR .\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, .\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL .\" HEWLETT-PACKARD COMPANY BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, .\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF .\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE .\" SOFTWARE. .\" .\" Except as contained in this notice, the name of the Hewlett-Packard Company shall not .\" be used in advertising or otherwise to promote the sale, use or other .\" dealing in this Software without prior written authorization from the .\" Hewlett-Packard Company. .\" .TH XdbeGetVisualInfo __libmansuffix__ __xorgversion__ "X FUNCTIONS" .SH NAME XdbeGetVisualInfo - Get dbe Visual Informations .SH SYNOPSIS \&#include <X11/extensions/Xdbe.h> XdbeScreenVisualInfo *XdbeGetVisualInfo( Display *dpy, Drawable *screen_specifiers, int *num_screens) .SH DESCRIPTION This function returns information about which visuals support double buffering. The argument .I num_screens specifies how many elements there are in the .I screen_specifiers list. Each drawable in .I screen_specifiers designates a screen for which the supported visuals are being requested. If .I num_screens is zero, information for all screens is requested. In this case, upon return from this function, .I 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 .I XdbeScreenVisualInfo structures of length .I num_screens. The nth element in the returned list corresponds to the nth drawable in the .I screen_specifiers list, unless .I 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 .I XdbeScreenVisualInfo structure has the following fields: int count XdbeVisualInfo *visinfo .I count specifies the number of items in .I visinfo. .I visinfo specifies a list of visuals, depths, and performance hints for this screen. The .I XdbeVisualInfo structure has the following fields: VisualID visual int depth int perflevel .I visual specifies one visual ID that supports double-buffering. .I depth specifies the depth of the visual. .I perflevel is a performance hint. The only operation defined on a .I perflevel is comparison to a .I perflevel of another visual on the same screen. The visual having the higher .I perflevel is likely to have better double-buffering graphics performance than the visual having the lower .I perflevel. Nothing can be deduced from the following: the magnitude of the difference of two .I perflevels, a .I perflevel value in isolation, or comparing .I perflevels from different servers. .SH ERRORS .IP BadDrawable One or more values passed in .I screen_specifiers is not a valid drawable. .SH SEE ALSO DBE, .I XdbeAllocateBackBufferName(), .I XdbeBeginIdiom(), .I XdbeDeallocateBackBufferName(), .I XdbeEndIdiom(), .I XdbeFreeVisualInfo(), .I XdbeGetBackBufferAttributes(), .I XdbeQueryExtension(), .I XdbeSwapBuffers().