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devdraw: correct mouse event buffering on OS X

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This commit is contained in:
Russ Cox 2008-07-10 00:07:57 -04:00
parent c752966bcb
commit 1f74e1b758
1 changed files with 22 additions and 15 deletions
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37
src/cmd/devdraw/osx-srv.c
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@ -45,6 +45,7 @@ struct Kbdbuf
struct Mousebuf
{
Mouse m[32];
Mouse last;
int ri;
int wi;
int stall;
@ -201,7 +202,6 @@ runmsg(Wsysmsg *m)
mousetags.wi = 0;
if(mousetags.wi == mousetags.ri)
sysfatal("too many queued mouse reads");
/* fprint(2, "mouse unstall\n"); */
mouse.stall = 0;
matchmouse();
zunlock();
@ -379,21 +379,28 @@ mousetrack(int x, int y, int b, int ms)
y = mouserect.max.y;
zlock();
m = &mouse.m[mouse.wi];
m->xy.x = x;
m->xy.y = y;
m->buttons = b;
m->msec = ms;
mouse.wi++;
if(mouse.wi == nelem(mouse.m))
mouse.wi = 0;
if(mouse.wi == mouse.ri){
mouse.stall = 1;
mouse.ri = 0;
mouse.wi = 1;
mouse.m[0] = *m;
// If reader has stopped reading, don't bother.
// If reader is completely caught up, definitely queue.
// Otherwise, queue only button change events.
if(!mouse.stall)
if(mouse.wi == mouse.ri || mouse.last.buttons != b){
m = &mouse.last;
m->xy.x = x;
m->xy.y = y;
m->buttons = b;
m->msec = ms;
mouse.m[mouse.wi] = *m;
if(++mouse.wi == nelem(mouse.m))
mouse.wi = 0;
if(mouse.wi == mouse.ri){
mouse.stall = 1;
mouse.ri = 0;
mouse.wi = 1;
mouse.m[0] = *m;
}
matchmouse();
}
matchmouse();
zunlock();
}