diff options
Diffstat (limited to 'libX11/src/PolyTxt.c')
| -rw-r--r-- | libX11/src/PolyTxt.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/libX11/src/PolyTxt.c b/libX11/src/PolyTxt.c new file mode 100644 index 000000000..eb93ffd65 --- /dev/null +++ b/libX11/src/PolyTxt.c @@ -0,0 +1,236 @@ +/* $Xorg: PolyTxt.c,v 1.4 2001/02/09 02:03:35 xorgcvs Exp $ */ +/* + +Copyright 1986, 1998 The Open Group + +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. + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN +AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of The Open Group shall not be +used in advertising or otherwise to promote the sale, use or other dealings +in this Software without prior written authorization from The Open Group. + +*/ +/* $XFree86: xc/lib/X11/PolyTxt.c,v 3.5 2001/10/28 03:32:30 tsi Exp $ */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include "Xlibint.h" + +int +XDrawText( + register Display *dpy, + Drawable d, + GC gc, + int x, + int 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) * ((-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 = NULL; + + 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 */ + memcpy (tbuf+2 , CharacterOffset, 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 */ + memcpy (tbuf+2 , CharacterOffset, 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 0; + } |