1 /*
2 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
3 *
4 * This is part of HarfBuzz, an OpenType Layout engine library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 */
24
25 #include "harfbuzz-shaper.h"
26 #include "harfbuzz-shaper-private.h"
27 #include "harfbuzz-external.h"
28
29 #include <assert.h>
30 #include <stdio.h>
31
32 typedef int (*th_brk_def)(const char*, int[], int);
33 static th_brk_def th_brk = 0;
34 static int libthai_resolved = 0;
35
resolve_libthai()36 static void resolve_libthai()
37 {
38 if (!th_brk)
39 th_brk = (th_brk_def)HB_Library_Resolve("thai", 0, "th_brk");
40 libthai_resolved = 1;
41 }
42
to_tis620(const HB_UChar16 * string,hb_uint32 len,const char * cstr)43 static void to_tis620(const HB_UChar16 *string, hb_uint32 len, const char *cstr)
44 {
45 hb_uint32 i;
46 unsigned char *result = (unsigned char *)cstr;
47
48 for (i = 0; i < len; ++i) {
49 if (string[i] <= 0xa0)
50 result[i] = (unsigned char)string[i];
51 if (string[i] >= 0xe01 && string[i] <= 0xe5b)
52 result[i] = (unsigned char)(string[i] - 0xe00 + 0xa0);
53 else
54 result[i] = '?';
55 }
56
57 result[len] = 0;
58 }
59
thaiWordBreaks(const HB_UChar16 * string,hb_uint32 len,HB_CharAttributes * attributes)60 static void thaiWordBreaks(const HB_UChar16 *string, hb_uint32 len, HB_CharAttributes *attributes)
61 {
62 char s[128];
63 char *cstr = s;
64 int brp[128];
65 int *break_positions = brp;
66 hb_uint32 numbreaks;
67 hb_uint32 i;
68
69 if (!libthai_resolved)
70 resolve_libthai();
71
72 if (!th_brk)
73 return;
74
75 if (len >= 128)
76 cstr = (char *)malloc(len*sizeof(char) + 1);
77
78 to_tis620(string, len, cstr);
79
80 numbreaks = th_brk(cstr, break_positions, 128);
81 if (numbreaks > 128) {
82 break_positions = (int *)malloc(numbreaks * sizeof(int));
83 numbreaks = th_brk(cstr, break_positions, numbreaks);
84 }
85
86 for (i = 0; i < len; ++i) {
87 attributes[i].lineBreakType = HB_NoBreak;
88 attributes[i].wordBoundary = FALSE;
89 }
90
91 for (i = 0; i < numbreaks; ++i) {
92 if (break_positions[i] > 0) {
93 attributes[break_positions[i]-1].lineBreakType = HB_Break;
94 attributes[break_positions[i]-1].wordBoundary = TRUE;
95 }
96 }
97
98 if (break_positions != brp)
99 free(break_positions);
100
101 if (len >= 128)
102 free(cstr);
103 }
104
HB_ThaiAttributes(HB_Script script,const HB_UChar16 * text,hb_uint32 from,hb_uint32 len,HB_CharAttributes * attributes)105 void HB_ThaiAttributes(HB_Script script, const HB_UChar16 *text, hb_uint32 from, hb_uint32 len, HB_CharAttributes *attributes)
106 {
107 assert(script == HB_Script_Thai);
108 attributes += from;
109 thaiWordBreaks(text + from, len, attributes);
110 }
111
112