bitmap.c revision e24f450b 
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 "fntfilst.h"
36#include "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    CharInfoPtr **encoding;
53    CharInfoPtr pDefault;
54
55    bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
56    encoding = bitmapFont->encoding;
57    pDefault = bitmapFont->pDefault;
58    firstCol = pFont->info.firstCol;
59    numCols = pFont->info.lastCol - firstCol + 1;
60    glyphsBase = glyphs;
61    switch (charEncoding) {
62
63    case Linear8Bit:
64    case TwoD8Bit:
65        if (pFont->info.firstRow > 0) {
66            if (pDefault)
67                while (count--)
68                    *glyphs++ = pDefault;
69            break;
70        }
71        if (pFont->info.allExist && pDefault) {
72            while (count--) {
73                c = (*chars++) - firstCol;
74                if (c < numCols)
75                    *glyphs++ = ACCESSENCODING(encoding, c);
76                else
77                    *glyphs++ = pDefault;
78            }
79        }
80        else {
81            while (count--) {
82                c = (*chars++) - firstCol;
83                if (c < numCols && (pci = ACCESSENCODING(encoding, c)))
84                    *glyphs++ = pci;
85                else if (pDefault)
86                    *glyphs++ = pDefault;
87            }
88        }
89        break;
90    case Linear16Bit:
91        if (pFont->info.allExist && pDefault) {
92            while (count--) {
93                c = *chars++ << 8;
94                c = (c | *chars++) - firstCol;
95                if (c < numCols)
96                    *glyphs++ = ACCESSENCODING(encoding, c);
97                else
98                    *glyphs++ = pDefault;
99            }
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            unsigned int r;
118
119            r = (*chars++) - firstRow;
120            c = (*chars++) - firstCol;
121            if (r < numRows && c < numCols &&
122                (pci = ACCESSENCODING(encoding, r * numCols + c)))
123                *glyphs++ = pci;
124            else if (pDefault)
125                *glyphs++ = pDefault;
126        }
127        break;
128    }
129    *glyphCount = glyphs - glyphsBase;
130    return Successful;
131}
132
133static CharInfoRec nonExistantChar;
134
135int
136bitmapGetMetrics(FontPtr pFont, unsigned long count, unsigned char *chars,
137                 FontEncoding charEncoding,
138                 unsigned long *glyphCount,        /* RETURN */
139                 xCharInfo ** glyphs)              /* RETURN */
140{
141    int ret;
142    BitmapFontPtr bitmapFont  = (BitmapFontPtr) pFont->fontPrivate;
143    CharInfoPtr oldDefault = bitmapFont->pDefault;
144
145    bitmapFont->pDefault = &nonExistantChar;
146    ret =
147        bitmapGetGlyphs(pFont, count, chars, charEncoding, glyphCount,
148                        (CharInfoPtr *) glyphs);
149    if (ret == Successful) {
150        if (bitmapFont->ink_metrics) {
151            CharInfoPtr metrics = bitmapFont->metrics;
152            xCharInfo *ink_metrics = bitmapFont->ink_metrics;
153
154            for (unsigned long i = 0; i < *glyphCount; i++) {
155                if (glyphs[i] != (xCharInfo *) & nonExistantChar)
156                    glyphs[i] =
157                        ink_metrics + (((CharInfoPtr) glyphs[i]) - metrics);
158            }
159        }
160    }
161    bitmapFont->pDefault = oldDefault;
162    return ret;
163}
164