ref: 84989770721391018dd6a247831cb79a43c1d86b
dir: /libdraw/init.c/
#include "lib9.h"
#include "draw.h"
#include "kernel.h"
#include "interp.h"
int _drawdebug;
enum {
CHECKLOCKING = 0
};
/*
* Attach, or possibly reattach, to window.
* If reattaching, maintain value of screen pointer.
*/
int
gengetwindow(Display *d, char *winname, Image **winp, Screen **scrp, int ref)
{
int n, fd;
char buf[64+1];
Image *image;
fd = libopen(winname, OREAD);
if(fd<0 || (n=libread(fd, buf, sizeof buf-1))<=0){
*winp = d->image;
assert(*winp && (*winp)->chan != 0);
return 1;
}
libclose(fd);
buf[n] = '\0';
if(*winp != nil){
_freeimage1(*winp);
freeimage((*scrp)->image);
freescreen(*scrp);
*scrp = nil;
}
image = namedimage(d, buf);
if(image == 0){
*winp = nil;
return -1;
}
assert(image->chan != 0);
*scrp = allocscreen(image, d->white, 0);
if(*scrp == nil){
*winp = nil;
return -1;
}
*winp = _allocwindow(*winp, *scrp, insetrect(image->r, Borderwidth), ref, DWhite);
if(*winp == nil)
return -1;
assert((*winp)->chan != 0);
return 1;
}
#define NINFO 12*12
Display*
initdisplay(char *dev, char *win, void(*error)(Display*, char*))
{
char buf[128], info[NINFO+1], *t;
int datafd, ctlfd, reffd;
Display *disp;
Image *image;
Dir *dir;
void *q;
ulong chan;
fmtinstall('P', Pfmt);
fmtinstall('R', Rfmt);
if(dev == 0)
dev = "/dev";
if(win == 0)
win = "/dev";
if(strlen(dev)>sizeof buf-25 || strlen(win)>sizeof buf-25){
kwerrstr("initdisplay: directory name too long");
return nil;
}
t = strdup(win);
if(t == nil)
return nil;
q = libqlalloc();
if(q == nil)
return nil;
sprint(buf, "%s/draw/new", dev);
ctlfd = libopen(buf, ORDWR);
if(ctlfd < 0){
if(libbind("#i", dev, MBEFORE) < 0){
Error1:
libqlfree(q);
free(t);
kwerrstr("initdisplay: %s: %r", buf);
return 0;
}
ctlfd = libopen(buf, ORDWR);
}
if(ctlfd < 0)
goto Error1;
if(libread(ctlfd, info, sizeof info) < NINFO){
Error2:
libclose(ctlfd);
goto Error1;
}
if((chan=strtochan(info+2*12)) == 0){
kwerrstr("bad channel in %s", buf);
goto Error2;
}
sprint(buf, "%s/draw/%d/data", dev, atoi(info+0*12));
datafd = libopen(buf, ORDWR);
if(datafd < 0)
goto Error2;
sprint(buf, "%s/draw/%d/refresh", dev, atoi(info+0*12));
reffd = libopen(buf, OREAD);
if(reffd < 0){
Error3:
libclose(datafd);
goto Error2;
}
strcpy(buf, "allocation failed");
disp = malloc(sizeof(Display));
if(disp == 0){
Error4:
libclose(reffd);
goto Error3;
}
image = malloc(sizeof(Image));
if(image == 0){
Error5:
free(disp);
goto Error4;
}
memset(image, 0, sizeof(Image));
memset(disp, 0, sizeof(Display));
image->display = disp;
image->id = 0;
image->chan = chan;
image->depth = chantodepth(chan);
image->repl = atoi(info+3*12);
image->r.min.x = atoi(info+4*12);
image->r.min.y = atoi(info+5*12);
image->r.max.x = atoi(info+6*12);
image->r.max.y = atoi(info+7*12);
image->clipr.min.x = atoi(info+8*12);
image->clipr.min.y = atoi(info+9*12);
image->clipr.max.x = atoi(info+10*12);
image->clipr.max.y = atoi(info+11*12);
disp->dirno = atoi(info+0*12);
disp->datachan = libfdtochan(datafd, ORDWR);
disp->refchan = libfdtochan(reffd, OREAD);
disp->ctlchan = libfdtochan(ctlfd, ORDWR);
if(disp->datachan == nil || disp->refchan == nil || disp->ctlchan == nil)
goto Error4;
disp->bufsize = Displaybufsize; /* TO DO: iounit(datafd) */
if(disp->bufsize <= 0)
disp->bufsize = Displaybufsize;
if(disp->bufsize < 512){
kwerrstr("iounit %d too small", disp->bufsize);
goto Error5;
}
/* TO DO: allocate buffer */
libclose(datafd);
libclose(reffd);
disp->image = image;
disp->bufp = disp->buf;
disp->error = error;
disp->chan = image->chan;
disp->depth = image->depth;
disp->windir = t;
disp->devdir = strdup(dev);
disp->qlock = q;
libqlock(q);
disp->white = allocimage(disp, Rect(0, 0, 1, 1), GREY1, 1, DWhite);
disp->black = allocimage(disp, Rect(0, 0, 1, 1), GREY1, 1, DBlack);
disp->opaque = allocimage(disp, Rect(0, 0, 1, 1), GREY1, 1, DWhite);
disp->transparent = allocimage(disp, Rect(0, 0, 1, 1), GREY1, 1, DBlack);
if(disp->white == nil || disp->black == nil || disp->opaque == nil || disp->transparent == nil){
free(image);
free(disp->devdir);
free(disp->white);
free(disp->black);
libclose(ctlfd);
goto Error5;
}
if((dir = libdirfstat(ctlfd))!=nil && dir->type=='i'){
disp->local = 1;
disp->dataqid = dir->qid.path;
}
free(dir);
libclose(ctlfd);
if(CHECKLOCKING)
disp->local = 0; /* force display locking even for local access */
assert(disp->chan != 0 && image->chan != 0);
return disp;
}
/*
* Call with d unlocked.
* Note that disp->defaultfont and defaultsubfont are not freed here.
*/
void
closedisplay(Display *disp)
{
int fd;
char buf[128];
if(disp == nil)
return;
libqlock(disp->qlock);
if(disp->oldlabel[0]){
snprint(buf, sizeof buf, "%s/label", disp->windir);
fd = libopen(buf, OWRITE);
if(fd >= 0){
libwrite(fd, disp->oldlabel, strlen(disp->oldlabel));
libclose(fd);
}
}
free(disp->devdir);
free(disp->windir);
freeimage(disp->white);
freeimage(disp->black);
freeimage(disp->opaque);
freeimage(disp->transparent);
free(disp->image);
libchanclose(disp->datachan);
libchanclose(disp->refchan);
libchanclose(disp->ctlchan);
/* should cause refresh slave to shut down */
libqunlock(disp->qlock);
libqlfree(disp->qlock);
free(disp);
}
int
lockdisplay(Display *disp)
{
if(disp->local)
return 0;
if(libqlowner(disp->qlock) != currun()){
libqlock(disp->qlock);
return 1;
}
return 0;
}
void
unlockdisplay(Display *disp)
{
if(disp->local)
return;
libqunlock(disp->qlock);
}
/* use static buffer to avoid stack bloat */
int
_drawprint(int fd, char *fmt, ...)
{
int n;
va_list arg;
char buf[128];
// static QLock l;
// qlock(&l);
va_start(arg, fmt);
vseprint(buf, buf+sizeof buf, fmt, arg);
va_end(arg);
n = libwrite(fd, buf, strlen(buf));
// qunlock(&l);
return n;
}
#ifdef YYY
void
drawerror(Display *d, char *s)
{
char err[ERRMAX];
if(d->error)
d->error(d, s);
else{
err[0] = 0;
errstr(err, sizeof err);
_drawprint(2, "draw: %s: %s\n", s, err);
exits(s);
}
}
static
int
doflush(Display *d)
{
int n;
n = d->bufp-d->buf;
if(n <= 0)
return 1;
if(kchanio(d->datachan, d->buf, n, OWRITE) != n){
if(_drawdebug)
_drawprint(2, "flushimage fail: d=%p: %r\n", d); /**/
d->bufp = d->buf; /* might as well; chance of continuing */
return -1;
}
d->bufp = d->buf;
return 1;
}
int
flushimage(Display *d, int visible)
{
if(visible)
*d->bufp++ = 'v'; /* one byte always reserved for this */
return doflush(d);
}
uchar*
bufimage(Display *d, int n)
{
uchar *p;
if(n<0 || n>Displaybufsize){
kwerrstr("bad count in bufimage");
return 0;
}
if(d->bufp+n > d->buf+Displaybufsize)
if(doflush(d) < 0)
return 0;
p = d->bufp;
d->bufp += n;
return p;
}
#endif