PolyTxt16.c revision b4ee4795 
1/*
2
3Copyright 1986, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25*/
26
27#ifdef HAVE_CONFIG_H
28#include <config.h>
29#endif
30#include "Xlibint.h"
31
32int
33XDrawText16(
34    register Display *dpy,
35    Drawable d,
36    GC gc,
37    int x,
38    int y,
39    XTextItem16 *items,
40    int nitems)
41{
42    register int i;
43    register XTextItem16 *item;
44    int length = 0;
45    register xPolyText16Req *req;
46
47    LockDisplay(dpy);
48    FlushGC(dpy, gc);
49    GetReq (PolyText16, req);
50    req->drawable = d;
51    req->gc = gc->gid;
52    req->x = x;
53    req->y = y;
54
55    item = items;
56    for (i=0; i < nitems; i++) {
57	if (item->font)
58	    length += 5;  /* a 255 byte, plus size of Font id */
59        if (item->delta)
60        {
61	    if (item->delta > 0)
62	    {
63	      length += SIZEOF(xTextElt) * ((item->delta + 126) / 127);
64	    }
65            else
66            {
67   	      length += SIZEOF(xTextElt) * ((-item->delta + 127) / 128);
68 	    }
69        }
70	if (item->nchars > 0)
71	{
72	    length += SIZEOF(xTextElt) * ((item->nchars + 253) / 254 - 1);
73	    if (!item->delta) length += SIZEOF(xTextElt);
74	    length += item->nchars << 1;
75     	}
76	item++;
77    }
78
79    req->length += (length + 3)>>2;  /* convert to number of 32-bit words */
80
81
82    /*
83     * If the entire request does not fit into the remaining space in the
84     * buffer, flush the buffer first.   If the request does fit into the
85     * empty buffer, then we won't have to flush it at the end to keep
86     *  the buffer 32-bit aligned.
87     */
88
89    if (dpy->bufptr + length > dpy->bufmax)
90    	_XFlush (dpy);
91
92    item = items;
93    for (i=0; i< nitems; i++) {
94
95	if (item->font) {
96            /* to mark a font shift, write a 255 byte followed by
97	       the 4 bytes of font ID, big-end first */
98	    register unsigned char *f;
99	    BufAlloc (unsigned char *, f, 5);
100
101	    f[0] = 255;
102	    f[1] = (item->font & 0xff000000) >> 24;
103	    f[2] = (item->font & 0x00ff0000) >> 16;
104	    f[3] = (item->font & 0x0000ff00) >> 8;
105	    f[4] =  item->font & 0x000000ff;
106
107            /* update GC shadow */
108	    gc->values.font = item->font;
109	    }
110
111	{
112	    int nbytes = SIZEOF(xTextElt);
113	    int PartialNChars = item->nchars;
114	    int PartialDelta = item->delta;
115            register xTextElt *elt = NULL;
116	    int FirstTimeThrough = True;
117 	    XChar2b *CharacterOffset = item->chars;
118
119	    while((PartialDelta < -128) || (PartialDelta > 127))
120            {
121	    	int nb = SIZEOF(xTextElt);
122
123	    	BufAlloc (xTextElt *, elt, nb);
124	    	elt->len = 0;
125	    	if (PartialDelta > 0 )
126		{
127		    elt->delta = 127;
128		    PartialDelta = PartialDelta - 127;
129		}
130		else
131		{
132		    elt->delta = -128;
133		    PartialDelta = PartialDelta + 128;
134		}
135	    }
136	    if (PartialDelta)
137            {
138                BufAlloc (xTextElt *, elt, nbytes);
139	        elt->len = 0;
140		elt->delta = PartialDelta;
141	    }
142	    while(PartialNChars > 254)
143            {
144		nbytes = 254 * 2;
145	    	if (FirstTimeThrough)
146		{
147		    FirstTimeThrough = False;
148		    if (!item->delta)
149 		    {
150			nbytes += SIZEOF(xTextElt);
151	   		BufAlloc (xTextElt *, elt, nbytes);
152		        elt->delta = 0;
153		    }
154		    else
155		    {
156			char *DummyChar;
157		        BufAlloc(char *, DummyChar, nbytes);
158#ifdef lint
159			DummyChar = DummyChar;
160#endif
161		    }
162		}
163		else
164		{
165 		    nbytes += SIZEOF(xTextElt);
166	   	    BufAlloc (xTextElt *, elt, nbytes);
167		    elt->delta = 0;
168		}
169	    	elt->len = 254;
170
171#if defined(MUSTCOPY) || defined(MUSTCOPY2B)
172		{
173		    register int i;
174		    register unsigned char *cp;
175		    for (i = 0, cp = ((unsigned char *)elt) + 2; i < 254; i++) {
176			*cp++ = CharacterOffset[i].byte1;
177			*cp++ = CharacterOffset[i].byte2;
178		    }
179		}
180#else
181		memcpy ((char *) (elt + 1), (char *)CharacterOffset, 254 * 2);
182#endif
183		PartialNChars = PartialNChars - 254;
184		CharacterOffset += 254;
185
186	    }
187	    if (PartialNChars)
188            {
189		nbytes = PartialNChars * 2;
190	    	if (FirstTimeThrough)
191		{
192		    FirstTimeThrough = False;
193		    if (!item->delta)
194 		    {
195			nbytes += SIZEOF(xTextElt);
196	   		BufAlloc (xTextElt *, elt, nbytes);
197			elt->delta = 0;
198		    }
199		    else
200		    {
201			char *DummyChar;
202		        BufAlloc(char *, DummyChar, nbytes);
203#ifdef lint
204			DummyChar = DummyChar;
205#endif
206		    }
207		}
208		else
209		{
210 		    nbytes += SIZEOF(xTextElt);
211	   	    BufAlloc (xTextElt *, elt, nbytes);
212		    elt->delta = 0;
213		}
214	    	elt->len = PartialNChars;
215
216#if defined(MUSTCOPY) || defined(MUSTCOPY2B)
217		{
218		    register int i;
219		    register unsigned char *cp;
220		    for (i = 0, cp = ((unsigned char *)elt) + 2; i < PartialNChars;
221			 i++) {
222			*cp++ = CharacterOffset[i].byte1;
223			*cp++ = CharacterOffset[i].byte2;
224		    }
225		}
226#else
227		memcpy ((char *) (elt + 1), (char *)CharacterOffset,
228			PartialNChars *
2292);
230#endif
231	    }
232	}
233    item++;
234    }
235
236    /* Pad request out to a 32-bit boundary */
237
238    if (length &= 3) {
239	char *pad;
240	/*
241	 * BufAlloc is a macro that uses its last argument more than
242	 * once, otherwise I'd write "BufAlloc (char *, pad, 4-length)"
243	 */
244	length = 4 - length;
245	BufAlloc (char *, pad, length);
246	/*
247	 * if there are 3 bytes of padding, the first byte MUST be 0
248	 * so the pad bytes aren't mistaken for a final xTextElt
249	 */
250	*pad = 0;
251        }
252
253    /*
254     * If the buffer pointer is not now pointing to a 32-bit boundary,
255     * we must flush the buffer so that it does point to a 32-bit boundary
256     * at the end of this routine.
257     */
258
259    if ((dpy->bufptr - dpy->buffer) & 3)
260       _XFlush (dpy);
261
262    UnlockDisplay(dpy);
263    SyncHandle();
264    return 1;
265    }
266
267
268
269