.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 
.MR fcall 3 .
They manipulate graphics device protocol messages
rather than 9P protocol messages.
The graphics device protocol is used for internal 
communication between the
.MR devdraw 1
graphics server
and the
.MR 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
.MR devdraw 1 ,
.MR draw 3 ,
.MR graphics 3