123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383 |
- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #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 */
- uint32_t counter; /* increments every update */
- uint32_t msec; /* time of last event */
- };
- struct Mouseinfo
- {
- Mousestate mst;
- int dx;
- int dy;
- int track; /* dx & dy updated */
- int redraw; /* update cursor on screen */
- uint32_t lastcounter; /* value when /dev/mouse read */
- Rendez r;
- Ref ref;
- QLock qlock;
- int open;
- int acceleration;
- int maxacc;
- Mousestate queue[16]; /* circular buffer of click events */
- int ri; /* read index into queue */
- int wi; /* write index into queue */
- uint8_t qfull; /* queue is full */
- };
- Mouseinfo mouse;
- Cursorinfo cursor;
- int mouseshifted;
- Cursor curs;
- void Cursortocursor(Cursor*);
- int mousechanged(void*);
- static void mouseclock(void);
- enum{
- Qdir,
- Qcursor,
- Qmouse,
- };
- static Dirtab mousedir[]={
- {".", {Qdir, 0, QTDIR}, 0, DMDIR|0555},
- {"cursor", {Qcursor}, 0, 0666},
- {"mouse", {Qmouse}, 0, 0666},
- };
- static uint8_t buttonmap[8] = {
- 0, 1, 2, 3, 4, 5, 6, 7,
- };
- extern Memimage* gscreen;
- extern void mousewarpnote(Point);
- static void
- mousereset(void)
- {
- curs = arrow;
- Cursortocursor(&arrow);
- }
- static void
- mouseinit(void)
- {
- cursoron(1);
- }
- static Chan*
- mouseattach(char *spec)
- {
- return devattach('m', spec);
- }
- static Walkqid*
- mousewalk(Chan *c, Chan *nc, char **name, int nname)
- {
- Walkqid *wq;
- wq = devwalk(c, nc, name, nname, mousedir, nelem(mousedir), devgen);
- if(wq != nil && wq->clone != c && (wq->clone->qid.type&QTDIR)==0)
- incref(&mouse.ref);
- return wq;
- }
- static int
- mousestat(Chan *c, uint8_t *db, int n)
- {
- return devstat(c, db, n, mousedir, nelem(mousedir), devgen);
- }
- static Chan*
- mouseopen(Chan *c, int omode)
- {
- switch((uint32_t)c->qid.path){
- case Qdir:
- if(omode != OREAD)
- error(Eperm);
- break;
- case Qmouse:
- lock(&mouse.ref.lock);
- if(mouse.open){
- unlock(&mouse.ref.lock);
- error(Einuse);
- }
- mouse.open = 1;
- mouse.ref.ref++;
- unlock(&mouse.ref.lock);
- break;
- default:
- incref(&mouse.ref);
- }
- c->mode = openmode(omode);
- c->flag |= COPEN;
- c->offset = 0;
- return c;
- }
- static void
- mousecreate(Chan *c, char *a, int i, uint32_t u)
- {
- error(Eperm);
- }
- static void
- mouseclose(Chan *c)
- {
- if((c->qid.type&QTDIR)==0 && (c->flag&COPEN)){
- lock(&mouse.ref.lock);
- if(c->qid.path == Qmouse)
- mouse.open = 0;
- if(--mouse.ref.ref == 0){
- cursoroff(1);
- curs = arrow;
- Cursortocursor(&arrow);
- cursoron(1);
- }
- unlock(&mouse.ref.lock);
- }
- }
- static int32_t
- mouseread(Chan *c, void *va, int32_t n, int64_t off)
- {
- char buf[4*12+1];
- uint8_t *p;
- uint32_t offset = off;
- Mousestate m;
- int b;
- p = va;
- switch((uint32_t)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;
- lock(&cursor.lock);
- 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);
- unlock(&cursor.lock);
- return n;
- case Qmouse:
- while(mousechanged(0) == 0)
- rendsleep(&mouse.r, mousechanged, 0);
- mouse.qfull = 0;
- /*
- * No lock of the indicies is necessary here, because ri is only
- * updated by us, and there is only one mouse reader
- * at a time. I suppose that more than one process
- * could try to read the fd at one time, but such behavior
- * is degenerate and already violates the calling
- * conventions for sleep above.
- */
- if(mouse.ri != mouse.wi){
- m = mouse.queue[mouse.ri];
- if(++mouse.ri == nelem(mouse.queue))
- mouse.ri = 0;
- } else {
- lock(&cursor.lock);
- m = mouse.mst;
- unlock(&cursor.lock);
- }
- b = buttonmap[m.buttons&7];
- /* put buttons 4 and 5 back in */
- b |= m.buttons & (3<<3);
- sprint(buf, "m%11d %11d %11d %11lu",
- m.xy.x, m.xy.y,
- b,
- m.msec);
- mouse.lastcounter = m.counter;
- if(n > 1+4*12)
- n = 1+4*12;
- memmove(va, buf, n);
- return n;
- }
- return 0;
- }
- static int32_t
- mousewrite(Chan *c, void *va, int32_t n, int64_t m)
- {
- char *p;
- Point pt;
- char buf[64];
- p = va;
- switch((uint32_t)c->qid.path){
- case Qdir:
- error(Eisdir);
- case Qcursor:
- cursoroff(1);
- 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);
- }
- qlock(&mouse.qlock);
- mouse.redraw = 1;
- mouseclock();
- qunlock(&mouse.qlock);
- cursoron(1);
- return n;
- case Qmouse:
- if(n > sizeof buf-1)
- n = sizeof buf -1;
- memmove(buf, va, n);
- buf[n] = 0;
- p = 0;
- pt.x = strtoul(buf+1, &p, 0);
- if(p == 0)
- error(Eshort);
- pt.y = strtoul(p, 0, 0);
- qlock(&mouse.qlock);
- if(ptinrect(pt, gscreen->r)){
- mousetrack(pt.x, pt.y, mouse.mst.buttons, nsec()/(1000*1000LL));
- mousewarpnote(pt);
- }
- qunlock(&mouse.qlock);
- return n;
- }
- error(Egreg);
- return -1;
- }
- Dev mousedevtab = {
- 'm',
- "mouse",
- mousereset,
- mouseinit,
- mouseattach,
- mousewalk,
- mousestat,
- mouseopen,
- mousecreate,
- mouseclose,
- mouseread,
- devbread,
- mousewrite,
- devbwrite,
- devremove,
- devwstat,
- };
- void
- Cursortocursor(Cursor *c)
- {
- lock(&cursor.lock);
- memmove(&cursor.cursor, c, sizeof(Cursor));
- setcursor(c);
- unlock(&cursor.lock);
- }
- static void
- mouseclock(void)
- {
- lock(&cursor.lock);
- if(mouse.redraw){
- mouse.redraw = 0;
- cursoroff(0);
- mouse.redraw = cursoron(0);
- }
- unlock(&cursor.lock);
- }
- /*
- * called at interrupt level to update the structure and
- * awaken any waiting procs.
- */
- void
- mousetrack(int x, int y, int b, int msec)
- {
- int lastb;
- lastb = mouse.mst.buttons;
- mouse.mst.xy = Pt(x, y);
- mouse.mst.buttons = b;
- mouse.redraw = 1;
- mouse.mst.counter++;
- mouse.mst.msec = msec;
- /*
- * if the queue fills, we discard the entire queue and don't
- * queue any more events until a reader polls the mouse.
- */
- if(!mouse.qfull && lastb != b){ /* add to ring */
- mouse.queue[mouse.wi] = mouse.mst;
- if(++mouse.wi == nelem(mouse.queue))
- mouse.wi = 0;
- if(mouse.wi == mouse.ri)
- mouse.qfull = 1;
- }
- rendwakeup(&mouse.r);
- mouseclock();
- }
- int
- mousechanged(void *v)
- {
- return mouse.lastcounter != mouse.mst.counter;
- }
- Point
- mousexy(void)
- {
- return mouse.mst.xy;
- }
- void
- mouseaccelerate(int x)
- {
- mouse.acceleration = x;
- if(mouse.acceleration < 3)
- mouse.maxacc = 2;
- else
- mouse.maxacc = mouse.acceleration;
- }
|