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XSolarisCheckColormapEquivalence 3Xmu "29 Aug 2011" "X Version 11" "XLIB FUNCTIONS"
NAME
XSolarisCheckColormapEquivalence - determines if two visuals are colormap equivalent
SYNOPSIS

#include <X11/Xmu/XmuSolaris.h>

Bool XSolarisCheckColormapEquivalence\^(

Display *display\f1\^,

int screen\f1\^,

Visual *visual1\f1\^,

Visual *visual2\f1\^);

ARGUMENTS
display\f1 1i
Specifies the connection to the X server.
screen\f1 1i
An integer specifying the screen on which the visuals are to be searched.
visual1\f1 1i
Specifies the first visual type supported on the screen. If the visual type is not one supported by the screen, a BadMatch error results.
visual2\f1 1i
Specifies the second visual type supported on the screen. If the visual type is not one supported by the screen, a BadMatch error results.
DESCRIPTION
This function returns True if the two Visuals are Colormap Equivalent, otherwise it returns False.

Colormap Equivalence is a minor relaxation of the X protocol supported by the Xsun (1) X server on Solaris 10 and earlier releases. Two Visuals are Colormap Equivalent if it is possible to use a Colormap created with one of the Visuals as the Colormap of a Window in the other Visual. This is useful on a system that supports Visuals that differ only in their OpenGL (GLX) Attributes.

For example, to avoid colormap flashing, when creating a window with a Visual that is in the same depth as the RootWindow, use the Default Colormap. In standard X, this is only possible if the Visual is the DefaultVisual. With Colormap Equivalence the requirement is relaxed.

To use this function, an application should link with libXmu.

EXAMPLES
You may be able to avoid creating a new colormap by using the following code: 

 if (!XSolarisCheckColormapEquivalence(dpy, screen, 
 vi->visual, DefaultVisual(dpy, screen)) {
 attributes.colormap = XCreateColormap(dpy, root,
 vi->visual, AllocNone);
 valuemask = CWColormap;
 }
 window = XCreateWindow(dpy, root, 0, 0, 500, 500, 0,
 vi->depth, CopyFromParent, vi->visual,
 valuemask, &attributes);
SEE ALSO
XCreateWindow (3X11), glXGetConfig (3gl).