ref: 37a8fc6168b3bf82df198fb20be5a8a53996187c
dir: /sys/src/cmd/vnc/devmouse.c/
#include <u.h>
#include <libc.h>
#include "compat.h"
#include "error.h"
#define Image IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"
typedef struct Mouseinfo Mouseinfo;
typedef struct Mousestate Mousestate;
struct Mousestate
{
Point xy; /* mouse.xy */
int buttons; /* mouse.buttons */
ulong counter; /* increments every update */
ulong msec; /* time of last event */
};
struct Mouseinfo
{
Lock;
Mousestate;
ulong lastcounter; /* value when /dev/mouse read */
Rendez r;
Ref;
int resize;
int open;
Mousestate queue[16]; /* circular buffer of click events */
ulong ri; /* read index into queue */
ulong wi; /* write index into queue */
};
Mouseinfo mouse;
Cursorinfo cursor;
Cursor curs;
void Cursortocursor(Cursor*);
int mousechanged(void*);
enum{
Qdir,
Qcursor,
Qmouse,
Qmousein,
Qmousectl,
};
static Dirtab mousedir[]={
".", {Qdir, 0, QTDIR}, 0, DMDIR|0555,
"cursor", {Qcursor}, 0, 0666,
"mouse", {Qmouse}, 0, 0666,
"mousein", {Qmousein}, 0, 0222,
"mousectl", {Qmousectl}, 0, 0222,
};
Cursor arrow = {
{ -1, -1 },
{ 0xFF, 0xFF, 0x80, 0x01, 0x80, 0x02, 0x80, 0x0C,
0x80, 0x10, 0x80, 0x10, 0x80, 0x08, 0x80, 0x04,
0x80, 0x02, 0x80, 0x01, 0x80, 0x02, 0x8C, 0x04,
0x92, 0x08, 0x91, 0x10, 0xA0, 0xA0, 0xC0, 0x40,
},
{ 0x00, 0x00, 0x7F, 0xFE, 0x7F, 0xFC, 0x7F, 0xF0,
0x7F, 0xE0, 0x7F, 0xE0, 0x7F, 0xF0, 0x7F, 0xF8,
0x7F, 0xFC, 0x7F, 0xFE, 0x7F, 0xFC, 0x73, 0xF8,
0x61, 0xF0, 0x60, 0xE0, 0x40, 0x40, 0x00, 0x00,
},
};
extern Memimage* gscreen;
extern void mousewarpnote(Point);
static void
mousereset(void)
{
curs = arrow;
Cursortocursor(&arrow);
}
static void
mouseinit(void)
{
curs = arrow;
Cursortocursor(&arrow);
cursoron();
}
static Chan*
mouseattach(char *spec)
{
return devattach('m', spec);
}
static Walkqid*
mousewalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, mousedir, nelem(mousedir), devgen);
}
static int
mousestat(Chan *c, uchar *db, int n)
{
return devstat(c, db, n, mousedir, nelem(mousedir), devgen);
}
static Chan*
mouseopen(Chan *c, int omode)
{
int mode;
mode = openmode(omode);
switch((ulong)c->qid.path){
case Qdir:
if(omode != OREAD)
error(Eperm);
break;
case Qmousein:
case Qmousectl:
error(Egreg);
break;
case Qmouse:
if(_tas(&mouse.open) != 0)
error(Einuse);
mouse.lastcounter = mouse.counter;
/* wet floor */
case Qcursor:
incref(&mouse);
}
c->mode = mode;
c->flag |= COPEN;
c->offset = 0;
return c;
}
static void
mouseclose(Chan *c)
{
if((c->qid.type&QTDIR)!=0 || (c->flag&COPEN)==0)
return;
switch((ulong)c->qid.path){
case Qmouse:
mouse.open = 0;
/* wet floor */
case Qcursor:
if(decref(&mouse) != 0)
return;
cursoroff();
curs = arrow;
Cursortocursor(&arrow);
cursoron();
}
}
static long
mouseread(Chan *c, void *va, long n, vlong off)
{
char buf[1+4*12+1];
uchar *p;
ulong offset = off;
Mousestate m;
p = va;
switch((ulong)c->qid.path){
case Qdir:
return devdirread(c, va, n, mousedir, nelem(mousedir), devgen);
case Qcursor:
if(offset != 0)
return 0;
if(n < 2*4+2*2*16)
error(Eshort);
n = 2*4+2*2*16;
BPLONG(p+0, curs.offset.x);
BPLONG(p+4, curs.offset.y);
memmove(p+8, curs.clr, 2*16);
memmove(p+40, curs.set, 2*16);
return n;
case Qmouse:
while(mousechanged(0) == 0)
rendsleep(&mouse.r, mousechanged, 0);
lock(&mouse);
if(mouse.ri != mouse.wi)
m = mouse.queue[mouse.ri++ % nelem(mouse.queue)];
else
m = mouse.Mousestate;
unlock(&mouse);
sprint(buf, "m%11d %11d %11d %11ld ",
m.xy.x, m.xy.y, m.buttons, m.msec);
mouse.lastcounter = m.counter;
if(mouse.resize){
mouse.resize = 0;
buf[0] = 'r';
}
if(n > 1+4*12)
n = 1+4*12;
memmove(va, buf, n);
return n;
}
return 0;
}
static long
mousewrite(Chan *c, void *va, long n, vlong)
{
char *p;
Point pt;
char buf[64];
p = va;
switch((ulong)c->qid.path){
case Qdir:
error(Eisdir);
case Qcursor:
cursoroff();
if(n < 2*4+2*2*16){
curs = arrow;
Cursortocursor(&arrow);
}else{
n = 2*4+2*2*16;
curs.offset.x = BGLONG(p+0);
curs.offset.y = BGLONG(p+4);
memmove(curs.clr, p+8, 2*16);
memmove(curs.set, p+40, 2*16);
Cursortocursor(&curs);
}
cursoron();
return n;
case Qmouse:
if(n > sizeof buf-1)
n = sizeof buf -1;
memmove(buf, va, n);
buf[n] = 0;
pt.x = strtol(buf+1, &p, 0);
if(*p == 0)
error(Eshort);
pt.y = strtol(p, 0, 0);
absmousetrack(pt.x, pt.y, mouse.buttons, nsec()/(1000*1000LL));
mousewarpnote(pt);
return n;
}
error(Egreg);
return -1;
}
Dev mousedevtab = {
'm',
"mouse",
mousereset,
mouseinit,
mouseattach,
mousewalk,
mousestat,
mouseopen,
devcreate,
mouseclose,
mouseread,
devbread,
mousewrite,
devbwrite,
devremove,
devwstat,
};
void
Cursortocursor(Cursor *c)
{
lock(&cursor);
memmove(&cursor.Cursor, c, sizeof(Cursor));
setcursor(c);
unlock(&cursor);
}
void
absmousetrack(int x, int y, int b, ulong msec)
{
int lastb;
if(gscreen==nil)
return;
if(x < gscreen->clipr.min.x)
x = gscreen->clipr.min.x;
if(x >= gscreen->clipr.max.x)
x = gscreen->clipr.max.x-1;
if(y < gscreen->clipr.min.y)
y = gscreen->clipr.min.y;
if(y >= gscreen->clipr.max.y)
y = gscreen->clipr.max.y-1;
lock(&mouse);
mouse.xy = Pt(x, y);
lastb = mouse.buttons;
mouse.buttons = b;
mouse.msec = msec;
mouse.counter++;
/*
* if the queue fills, don't queue any more events until a
* reader polls the mouse.
*/
if(b != lastb && (mouse.wi-mouse.ri) < nelem(mouse.queue))
mouse.queue[mouse.wi++ % nelem(mouse.queue)] = mouse.Mousestate;
unlock(&mouse);
rendwakeup(&mouse.r);
cursoron();
}
int
mousechanged(void*)
{
return mouse.lastcounter != mouse.counter || mouse.resize != 0;
}
Point
mousexy(void)
{
return mouse.xy;
}
/*
* notify reader that screen has been resized
*/
void
mouseresize(void)
{
mouse.resize = 1;
rendwakeup(&mouse.r);
}