bitmap.c revision 41c30155 
1/*
2
3Copyright 1991, 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/*
28 * Author:  Keith Packard, MIT X Consortium
29 */
30
31#ifdef HAVE_CONFIG_H
32#include <config.h>
33#endif
34
35#include <X11/fonts/fntfilst.h>
36#include <X11/fonts/bitmap.h>
37
38int
39bitmapGetGlyphs(FontPtr pFont, unsigned long count, unsigned char *chars,
40		FontEncoding charEncoding,
41		unsigned long *glyphCount, 	/* RETURN */
42		CharInfoPtr *glyphs) 		/* RETURN */
43{
44    BitmapFontPtr  bitmapFont;
45    unsigned int firstCol;
46    register unsigned int numCols;
47    unsigned int firstRow;
48    unsigned int numRows;
49    CharInfoPtr *glyphsBase;
50    register unsigned int c;
51    register CharInfoPtr pci;
52    unsigned int r;
53    CharInfoPtr **encoding;
54    CharInfoPtr pDefault;
55
56    bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
57    encoding = bitmapFont->encoding;
58    pDefault = bitmapFont->pDefault;
59    firstCol = pFont->info.firstCol;
60    numCols = pFont->info.lastCol - firstCol + 1;
61    glyphsBase = glyphs;
62    switch (charEncoding) {
63
64    case Linear8Bit:
65    case TwoD8Bit:
66	if (pFont->info.firstRow > 0)
67	    break;
68	if (pFont->info.allExist && pDefault) {
69	    while (count--) {
70		c = (*chars++) - firstCol;
71		if (c < numCols)
72		    *glyphs++ = ACCESSENCODING(encoding,c);
73		else
74		    *glyphs++ = pDefault;
75	    }
76	} else {
77	    while (count--) {
78		c = (*chars++) - firstCol;
79		if (c < numCols && (pci = ACCESSENCODING(encoding,c)))
80		    *glyphs++ = pci;
81		else if (pDefault)
82		    *glyphs++ = pDefault;
83	    }
84	}
85	break;
86    case Linear16Bit:
87	if (pFont->info.allExist && pDefault) {
88	    while (count--) {
89		c = *chars++ << 8;
90		c = (c | *chars++) - firstCol;
91		if (c < numCols)
92		    *glyphs++ = ACCESSENCODING(encoding,c);
93		else
94		    *glyphs++ = pDefault;
95	    }
96	} else {
97	    while (count--) {
98		c = *chars++ << 8;
99		c = (c | *chars++) - firstCol;
100		if (c < numCols && (pci = ACCESSENCODING(encoding,c)))
101		    *glyphs++ = pci;
102		else if (pDefault)
103		    *glyphs++ = pDefault;
104	    }
105	}
106	break;
107
108    case TwoD16Bit:
109	firstRow = pFont->info.firstRow;
110	numRows = pFont->info.lastRow - firstRow + 1;
111	while (count--) {
112	    r = (*chars++) - firstRow;
113	    c = (*chars++) - firstCol;
114	    if (r < numRows && c < numCols &&
115		    (pci = ACCESSENCODING(encoding, r * numCols + c)))
116		*glyphs++ = pci;
117	    else if (pDefault)
118		*glyphs++ = pDefault;
119	}
120	break;
121    }
122    *glyphCount = glyphs - glyphsBase;
123    return Successful;
124}
125
126static CharInfoRec nonExistantChar;
127
128int
129bitmapGetMetrics(FontPtr pFont, unsigned long count, unsigned char *chars,
130		 FontEncoding charEncoding,
131		 unsigned long *glyphCount,	/* RETURN */
132		 xCharInfo **glyphs)		/* RETURN */
133{
134    int         ret;
135    xCharInfo  *ink_metrics;
136    CharInfoPtr metrics;
137    BitmapFontPtr  bitmapFont;
138    CharInfoPtr	oldDefault;
139    int         i;
140
141    bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
142    oldDefault = bitmapFont->pDefault;
143    bitmapFont->pDefault = &nonExistantChar;
144    ret = bitmapGetGlyphs(pFont, count, chars, charEncoding, glyphCount, (CharInfoPtr *) glyphs);
145    if (ret == Successful) {
146	if (bitmapFont->ink_metrics) {
147	    metrics = bitmapFont->metrics;
148	    ink_metrics = bitmapFont->ink_metrics;
149	    for (i = 0; i < *glyphCount; i++) {
150		if (glyphs[i] != (xCharInfo *) & nonExistantChar)
151		    glyphs[i] = ink_metrics + (((CharInfoPtr) glyphs[i]) - metrics);
152	    }
153	}
154    }
155    bitmapFont->pDefault = oldDefault;
156    return ret;
157}
158