getpixmap.3

linux系统下的音频通信

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'\" Copyright (c) 1990 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\" SCCS: @(#) GetPixmap.3 1.7 96/03/26 18:11:47
'\" 
.so man.macros
.TH Tk_GetPixmap 3 4.0 Tk "Tk Library Procedures"
.BS
.SH NAME
Tk_GetPixmap, Tk_FreePixmap \- allocate and free pixmaps
.SH SYNOPSIS
.nf
\fB#include <tk.h>\fR
.sp
Pixmap
\fBTk_GetPixmap(\fIdisplay, d, width, height, depth\fB)\fR
.sp
\fBTk_FreePixmap(\fIdisplay, pixmap\fB)\fR
.SH ARGUMENTS
.AS "Drawable" *pixelPtr
.AP Display *display in
X display for the pixmap.
.AP Drawable d in
Pixmap or window where the new pixmap will be used for drawing.
.AP "int" width in
Width of pixmap.
.AP "int" height in
Height of pixmap.
.AP "int" depth in
Number of bits per pixel in pixmap.
.AP Pixmap pixmap in
Pixmap to destroy.
.BE

.SH DESCRIPTION
.PP
These procedures are identical to the Xlib procedures \fBXCreatePixmap\fR
and \fBXFreePixmap\fR, except that they have extra code to manage X
resource identifiers so that identifiers for deleted pixmaps can be
reused in the future.
It is important for Tk applications to use these procedures rather
than \fBXCreatePixmap\fR and \fBXFreePixmap\fR;  otherwise long-running
applications may run out of resource identifiers.
.PP
\fBTk_GetPixmap\fR creates a pixmap suitable for drawing in \fId\fR,
with dimensions given by \fIwidth\fR, \fIheight\fR, and \fIdepth\fR,
and returns its identifier.
\fBTk_FreePixmap\fR destroys the pixmap given by \fIpixmap\fR and makes
its resource identifier available for reuse.

.SH KEYWORDS
pixmap, resource identifier