1990/0324/port/devbit.c (diff list | history)

port/devbit.c on 1990/0324
1990/0324		#include "u.h" #include "lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "errno.h" #include "devtab.h" #include "gnot.h" extern Bitmap screen; struct{ Ref; int bltuse; QLock blt; /* a group of bitblts in a single write is atomic */ }bit; enum{ Qdir, Qbitblt, }; Dirtab bitdir[]={ "bitblt", Qbitblt, 0, 0600, }; #define NBIT (sizeof bitdir/sizeof(Dirtab)) void bitreset(void) { } void bitinit(void) { lock(&bit); bit.bltuse = 0; unlock(&bit); } Chan* bitattach(char *spec) { return devattach('b', spec); } Chan* bitclone(Chan *c, Chan *nc) { nc = devclone(c, nc); if(c->qid != CHDIR) incref(&bit); } int bitwalk(Chan *c, char *name) { return devwalk(c, name, bitdir, NBIT, devgen); } void bitstat(Chan *c, char *db) { devstat(c, db, bitdir, NBIT, devgen); } Chan * bitopen(Chan *c, int omode) { if(c->qid == CHDIR){ if(omode != OREAD) error(0, Eperm); }else{ /* * Always open #b/bitblt first */ lock(&bit); if((c->qid==Qbitblt && bit.bltuse) || (c->qid!=Qbitblt && !bit.bltuse)){ unlock(&bit); error(0, Einuse); } unlock(&bit); incref(&bit); } c->mode = openmode(omode); c->flag |= COPEN; c->offset = 0; return c; } void bitcreate(Chan *c, char *name, int omode, ulong perm) { error(0, Eperm); } void bitremove(Chan *c) { error(0, Eperm); } void bitwstat(Chan *c, char *db) { error(0, Eperm); } void bitclose(Chan *c) { if(c->qid != CHDIR){ lock(&bit); if(--bit.ref == 0) bit.bltuse = 0; unlock(&bit); } } long bitread(Chan *c, void *va, long n) { if(c->qid & CHDIR) return devdirread(c, va, n, bitdir, NBIT, devgen); error(0, Egreg); } #define SHORT(p) (((p)[0]<<0) | ((p)[1]<<8)) #define LONG(p) ((SHORT(p)<<0) | (SHORT(p+2)<<16)) long bitwrite(Chan *c, void *va, long n) { uchar *p; long m; long v; Point pt; Rectangle rect; Bitmap *src, *dst; if(c->qid == CHDIR) error(0, Eisdir); p = va; m = n; switch(c->qid){ case Qbitblt: qlock(&bit.blt); if(waserror()){ qunlock(&bit.blt); nexterror(); } while(m > 0) switch(*p){ case 'b': if(m < 31) error(0, Ebadblt); v = SHORT(p+1); if(v != 0) /* BUG */ error(0, Ebadblt); dst = &screen; pt.x = LONG(p+3); pt.y = LONG(p+7); v = SHORT(p+11); if(v != 0) /* BUG */ error(0, Ebadblt); src = &screen; rect.min.x = LONG(p+13); rect.min.y = LONG(p+17); rect.max.x = LONG(p+21); rect.max.y = LONG(p+25); v = SHORT(p+29); bitblt(dst, pt, src, rect, v); m -= 31; p += 31; break; default: error(0, Ebadblt); } qunlock(&bit.blt); break; default: error(0, Egreg); } return n; } void bituserstr(Error *e, char *buf) { consuserstr(e, buf); } void biterrstr(Error *e, char *buf) { rooterrstr(e, buf); }