bitmap.c revision a96d7823 
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#include "libxfontint.h"
35
36#include <X11/fonts/fntfilst.h>
37#include <X11/fonts/bitmap.h>
38
39int
40bitmapGetGlyphs(FontPtr pFont, unsigned long count, unsigned char *chars,
41		FontEncoding charEncoding,
42		unsigned long *glyphCount, 	/* RETURN */
43		CharInfoPtr *glyphs) 		/* RETURN */
44{
45    BitmapFontPtr  bitmapFont;
46    unsigned int firstCol;
47    register unsigned int numCols;
48    unsigned int firstRow;
49    unsigned int numRows;
50    CharInfoPtr *glyphsBase;
51    register unsigned int c;
52    register CharInfoPtr pci;
53    unsigned int r;
54    CharInfoPtr **encoding;
55    CharInfoPtr pDefault;
56
57    bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
58    encoding = bitmapFont->encoding;
59    pDefault = bitmapFont->pDefault;
60    firstCol = pFont->info.firstCol;
61    numCols = pFont->info.lastCol - firstCol + 1;
62    glyphsBase = glyphs;
63    switch (charEncoding) {
64
65    case Linear8Bit:
66    case TwoD8Bit:
67	if (pFont->info.firstRow > 0) {
68            if (pDefault)
69                while (count--)
70                    *glyphs++ = pDefault;
71	    break;
72        }
73	if (pFont->info.allExist && pDefault) {
74	    while (count--) {
75		c = (*chars++) - firstCol;
76		if (c < numCols)
77		    *glyphs++ = ACCESSENCODING(encoding,c);
78		else
79		    *glyphs++ = pDefault;
80	    }
81	} else {
82	    while (count--) {
83		c = (*chars++) - firstCol;
84		if (c < numCols && (pci = ACCESSENCODING(encoding,c)))
85		    *glyphs++ = pci;
86		else if (pDefault)
87		    *glyphs++ = pDefault;
88	    }
89	}
90	break;
91    case Linear16Bit:
92	if (pFont->info.allExist && pDefault) {
93	    while (count--) {
94		c = *chars++ << 8;
95		c = (c | *chars++) - firstCol;
96		if (c < numCols)
97		    *glyphs++ = ACCESSENCODING(encoding,c);
98		else
99		    *glyphs++ = pDefault;
100	    }
101	} else {
102	    while (count--) {
103		c = *chars++ << 8;
104		c = (c | *chars++) - firstCol;
105		if (c < numCols && (pci = ACCESSENCODING(encoding,c)))
106		    *glyphs++ = pci;
107		else if (pDefault)
108		    *glyphs++ = pDefault;
109	    }
110	}
111	break;
112
113    case TwoD16Bit:
114	firstRow = pFont->info.firstRow;
115	numRows = pFont->info.lastRow - firstRow + 1;
116	while (count--) {
117	    r = (*chars++) - firstRow;
118	    c = (*chars++) - firstCol;
119	    if (r < numRows && c < numCols &&
120		    (pci = ACCESSENCODING(encoding, r * numCols + c)))
121		*glyphs++ = pci;
122	    else if (pDefault)
123		*glyphs++ = pDefault;
124	}
125	break;
126    }
127    *glyphCount = glyphs - glyphsBase;
128    return Successful;
129}
130
131static CharInfoRec nonExistantChar;
132
133int
134bitmapGetMetrics(FontPtr pFont, unsigned long count, unsigned char *chars,
135		 FontEncoding charEncoding,
136		 unsigned long *glyphCount,	/* RETURN */
137		 xCharInfo **glyphs)		/* RETURN */
138{
139    int         ret;
140    xCharInfo  *ink_metrics;
141    CharInfoPtr metrics;
142    BitmapFontPtr  bitmapFont;
143    CharInfoPtr	oldDefault;
144    int         i;
145
146    bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
147    oldDefault = bitmapFont->pDefault;
148    bitmapFont->pDefault = &nonExistantChar;
149    ret = bitmapGetGlyphs(pFont, count, chars, charEncoding, glyphCount, (CharInfoPtr *) glyphs);
150    if (ret == Successful) {
151	if (bitmapFont->ink_metrics) {
152	    metrics = bitmapFont->metrics;
153	    ink_metrics = bitmapFont->ink_metrics;
154	    for (i = 0; i < *glyphCount; i++) {
155		if (glyphs[i] != (xCharInfo *) & nonExistantChar)
156		    glyphs[i] = ink_metrics + (((CharInfoPtr) glyphs[i]) - metrics);
157	    }
158	}
159    }
160    bitmapFont->pDefault = oldDefault;
161    return ret;
162}
163