1 /*
2 * Vertical Device Metrics
3 *
4 * Copyright © 1997-1998 Herbert Duerr
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the Free Softaware
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 */
21
22 #include "ttf.h"
23
VdmxTable(RandomAccessFile & f,int offset,int length)24 VdmxTable::VdmxTable(RandomAccessFile &f, int offset, int length):
25 RandomAccessFile(f, offset, length)
26 {
27 /* int version = */ readUShort();
28 nRecords = readSShort();
29 nRatios = readUShort();
30 }
31
32 int
getYmax(int pelHeight,int xres,int yres,int * ymax,int * ymin)33 VdmxTable::getYmax(int pelHeight, int xres, int yres, int *ymax, int *ymin)
34 {
35 uint16_t offset = 0;
36
37 for (int i = nRatios; --i >= 0;) {
38 /* uint8_t charSet = */ readUByte();
39 uint8_t xRatio = readUByte();
40 uint8_t yStartRatio= readUByte();
41 uint8_t yEndRatio = readUByte();
42 uint16_t tmp = readUShort();
43
44 if ((yres * xRatio >= xres * yStartRatio) &&
45 (yres * xRatio <= xres * yEndRatio)) {
46 offset = tmp;
47 break;
48 }
49 }
50
51 if (offset == 0)
52 return 0;
53
54 seekAbsolute(offset);
55
56 int nrecs = readUShort();
57 uint8_t startSize = readUByte();
58 uint8_t endSize = readUByte();
59
60 if (pelHeight < startSize || pelHeight > endSize)
61 return 0;
62
63 // XXX: should be a binary search
64 while (--nrecs >= 0) {
65 uint16_t ph = readUShort();
66 int16_t y1 = readSShort();
67 int16_t y2 = readSShort();
68
69 if (pelHeight == ph) {
70 *ymax = y1;
71 *ymin = y2;
72 return 1;
73 }
74 }
75
76 return 1;
77 }
78