142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/* $Xorg: Text.c,v 1.4 2001/02/09 02:03:37 xorgcvs Exp $ */
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/*
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Copyright 1986, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*/
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/* $XFree86: xc/lib/X11/Text.c,v 1.4 2001/12/14 19:54:07 dawes Exp $ */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "Xlibint.h"
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int
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XDrawString(
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register Display *dpy,
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Drawable d,
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GC gc,
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int x,
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int y,
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_Xconst char *string,
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int length)
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{
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int Datalength = 0;
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register xPolyText8Req *req;
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if (length <= 0)
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return 0;
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LockDisplay(dpy);
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FlushGC(dpy, gc);
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GetReq (PolyText8, req);
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req->drawable = d;
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req->gc = gc->gid;
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req->x = x;
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req->y = y;
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Datalength += SIZEOF(xTextElt) * ((length + 253) / 254) + length;
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req->length += (Datalength + 3)>>2; /* convert to number of 32-bit words */
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/*
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* If the entire request does not fit into the remaining space in the
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* buffer, flush the buffer first. If the request does fit into the
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* empty buffer, then we won't have to flush it at the end to keep
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* the buffer 32-bit aligned.
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*/
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if (dpy->bufptr + Datalength > dpy->bufmax)
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_XFlush (dpy);
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{
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int nbytes;
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int PartialNChars = length;
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/* register xTextElt *elt; */
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char *CharacterOffset = (char *)string;
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unsigned char *tbuf;
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while(PartialNChars > 254)
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{
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nbytes = 254 + SIZEOF(xTextElt);
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BufAlloc (unsigned char *, tbuf, nbytes);
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/* elt->delta = 0;
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* elt->len = 254;
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*/
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*(unsigned char *)tbuf = 254;
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*(tbuf+1) = 0;
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/* memcpy ((char *) (elt + 1), CharacterOffset, 254);
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*/
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memcpy ((char *)tbuf+2, CharacterOffset, 254);
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PartialNChars = PartialNChars - 254;
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CharacterOffset += 254;
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}
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if (PartialNChars)
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{
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nbytes = PartialNChars + SIZEOF(xTextElt);
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BufAlloc (unsigned char *, tbuf, nbytes);
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/* elt->delta = 0;
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* elt->len = PartialNChars;
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*/
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*(unsigned char *)tbuf = PartialNChars;
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*(tbuf+1) = 0;
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/* memcpy ((char *) (elt + 1), CharacterOffset, PartialNChars);
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*/
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memcpy ((char *)tbuf+2, CharacterOffset, PartialNChars);
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}
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}
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/* Pad request out to a 32-bit boundary */
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if (Datalength &= 3) {
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char *pad;
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/*
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* BufAlloc is a macro that uses its last argument more than
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* once, otherwise I'd write "BufAlloc (char *, pad, 4-length)"
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*/
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length = 4 - Datalength;
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BufAlloc (char *, pad, length);
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/*
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* if there are 3 bytes of padding, the first byte MUST be 0
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* so the pad bytes aren't mistaken for a final xTextElt
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*/
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*pad = 0;
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}
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/*
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* If the buffer pointer is not now pointing to a 32-bit boundary,
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* we must flush the buffer so that it does point to a 32-bit boundary
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* at the end of this routine.
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*/
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if ((dpy->bufptr - dpy->buffer) & 3)
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_XFlush (dpy);
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UnlockDisplay(dpy);
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SyncHandle();
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return 0;
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}
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