.TH DRAWFCALL 3
.SH NAME
convM2W, convW2M, drawfcallfmt, readwsysmsg, sizeW2M \- window system protocol
.SH SYNOPSIS
.nf
.PP
.ft L
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <mouse.h>
#include <cursor.h>
#include <drawfcall.h>
.ft P
.ta \w'\fLuint 'u
.PP
.B
uint	convM2W(uchar *ap, uint nap, Wsysmsg *w)
.PP
.B
uint	convW2M(Wsysmsg *w, uchar *ap, uint nap)
.PP
.B
int	drawfcallfmt(Fmt*)
.PP
.B
int	readwsysmsg(int fd, uchar *buf, uint nbuf)
.PP
.B
uint	sizeW2M(Wsysmsg *w)
.SH DESCRIPTION
These routines are analogues of the routines described in 
.IR fcall (3).
They manipulate graphics device protocol messages
rather than 9P protocol messages.
The graphics device protocol is used for internal 
communication between the
.IR devdraw (1)
graphics server
and the
.IR draw (3)
library.
A
.B Wsysmsg
is the C structure corresponding to a protocol message.
.PP
The protocol is intentionally undocumented and may change.
.SH SOURCE
.B \*9/src/libdraw/drawfcall.c
.SH SEE ALSO
.IR devdraw (1),
.IR draw (3),
.IR graphics (3)