/* $XConsortium: XPolyTxt.c,v 11.19 91/01/06 11:47:20 rws Exp $ */ /* Copyright Massachusetts Institute of Technology 1986 */ /* Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of M.I.T. not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. M.I.T. makes no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty. */ #include "Xlibint.h" XDrawText(dpy, d, gc, x, y, items, nitems) register Display *dpy; Drawable d; GC gc; int x, y; XTextItem *items; int nitems; { register int i; register XTextItem *item; int length = 0; register xPolyText8Req *req; LockDisplay(dpy); FlushGC(dpy, gc); GetReq (PolyText8, req); req->drawable = d; req->gc = gc->gid; req->x = x; req->y = y; item = items; for (i=0; i < nitems; i++) { if (item->font) length += 5; /* a 255 byte, plus size of Font id */ if (item->delta) { if (item->delta > 0) { length += SIZEOF(xTextElt) * ((item->delta + 126) / 127); } else { length += SIZEOF(xTextElt) * ((abs(item->delta) + 127) / 128); } } if (item->nchars > 0) { length += SIZEOF(xTextElt) * ((item->nchars + 253) / 254 - 1); if (!item->delta) length += SIZEOF(xTextElt); length += item->nchars; } item++; } req->length += (length + 3)>>2; /* convert to number of 32-bit words */ /* * If the entire request does not fit into the remaining space in the * buffer, flush the buffer first. If the request does fit into the * empty buffer, then we won't have to flush it at the end to keep * the buffer 32-bit aligned. */ if (dpy->bufptr + length > dpy->bufmax) _XFlush (dpy); item = items; for (i=0; i< nitems; i++) { if (item->font) { /* to mark a font shift, write a 255 byte followed by the 4 bytes of font ID, big-end first */ register unsigned char *f; BufAlloc (unsigned char *, f, 5); f[0] = 255; f[1] = (item->font & 0xff000000) >> 24; f[2] = (item->font & 0x00ff0000) >> 16; f[3] = (item->font & 0x0000ff00) >> 8; f[4] = item->font & 0x000000ff; /* update GC shadow */ gc->values.font = item->font; } { int nbytes = SIZEOF(xTextElt); int PartialNChars = item->nchars; int PartialDelta = item->delta; /* register xTextElt *elt; */ int FirstTimeThrough = True; char *CharacterOffset = item->chars; char *tbuf; while((PartialDelta < -128) || (PartialDelta > 127)) { int nb = SIZEOF(xTextElt); BufAlloc (char *, tbuf, nb); *tbuf = 0; /* elt->len */ if (PartialDelta > 0 ) { *(tbuf+1) = 127; /* elt->delta */ PartialDelta = PartialDelta - 127; } else { /* -128 = 0x8, need to be careful of signed chars... */ *((unsigned char *)(tbuf+1)) = 0x80; /* elt->delta */ PartialDelta = PartialDelta + 128; } } if (PartialDelta) { BufAlloc (char *, tbuf , nbytes); *tbuf = 0; /* elt->len */ *(tbuf+1) = PartialDelta; /* elt->delta */ } while(PartialNChars > 254) { nbytes = 254; if (FirstTimeThrough) { FirstTimeThrough = False; if (!item->delta) { nbytes += SIZEOF(xTextElt); BufAlloc (char *, tbuf, nbytes); *(tbuf+1) = 0; /* elt->delta */ } else { char *DummyChar; BufAlloc(char *, DummyChar, nbytes); } } else { nbytes += SIZEOF(xTextElt); BufAlloc (char *, tbuf, nbytes); *(tbuf+1) = 0; /* elt->delta */ } /* watch out for signs on chars */ *(unsigned char *)tbuf = 254; /* elt->len */ *tbuf = 254; /* elt->len */ bcopy (CharacterOffset, tbuf+2 , 254); PartialNChars = PartialNChars - 254; CharacterOffset += 254; } if (PartialNChars) { nbytes = PartialNChars; if (FirstTimeThrough) { FirstTimeThrough = False; if (!item->delta) { nbytes += SIZEOF(xTextElt); BufAlloc (char *, tbuf, nbytes); *(tbuf+1) = 0; /* elt->delta */ } else { char *DummyChar; BufAlloc(char *, DummyChar, nbytes); } } else { nbytes += SIZEOF(xTextElt); BufAlloc (char *, tbuf, nbytes); *(tbuf+1) = 0; /* elt->delta */ } *tbuf = PartialNChars; /* elt->len */ bcopy (CharacterOffset, tbuf+2 , PartialNChars); } } item++; } /* Pad request out to a 32-bit boundary */ if (length &= 3) { char *pad; /* * BufAlloc is a macro that uses its last argument more than * once, otherwise I'd write "BufAlloc (char *, pad, 4-length)" */ length = 4 - length; BufAlloc (char *, pad, length); /* * if there are 3 bytes of padding, the first byte MUST be 0 * so the pad bytes aren't mistaken for a final xTextElt */ *pad = 0; } /* * If the buffer pointer is not now pointing to a 32-bit boundary, * we must flush the buffer so that it does point to a 32-bit boundary * at the end of this routine. */ if ((dpy->bufptr - dpy->buffer) & 3) _XFlush (dpy); UnlockDisplay(dpy); SyncHandle(); return; }