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CmapCache.cpp
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1 /* GRAPHITE2 LICENSING
2 
3  Copyright 2010, SIL International
4  All rights reserved.
5 
6  This library is free software; you can redistribute it and/or modify
7  it under the terms of the GNU Lesser General Public License as published
8  by the Free Software Foundation; either version 2.1 of License, or
9  (at your option) any later version.
10 
11  This program 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  Lesser General Public License for more details.
15 
16  You should also have received a copy of the GNU Lesser General Public
17  License along with this library in the file named "LICENSE".
18  If not, write to the Free Software Foundation, 51 Franklin Street,
19  Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
20  internet at http://www.fsf.org/licenses/lgpl.html.
21 
22 Alternatively, the contents of this file may be used under the terms of the
23 Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
24 License, as published by the Free Software Foundation, either version 2
25 of the License or (at your option) any later version.
26 */
27 
28 #include "inc/Main.h"
29 #include "inc/CmapCache.h"
30 #include "inc/Face.h"
31 #include "inc/TtfTypes.h"
32 #include "inc/TtfUtil.h"
33 
34 
35 using namespace graphite2;
36 
37 const void * bmp_subtable(const Face::Table & cmap)
38 {
39  const void * stbl;
40  if (!cmap.size()) return 0;
41  if (TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 3, 1, cmap.size()), cmap + cmap.size())
42  || TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 3, cmap.size()), cmap + cmap.size())
43  || TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 2, cmap.size()), cmap + cmap.size())
44  || TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 1, cmap.size()), cmap + cmap.size())
45  || TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 0, cmap.size()), cmap + cmap.size()))
46  return stbl;
47  return 0;
48 }
49 
50 const void * smp_subtable(const Face::Table & cmap)
51 {
52  const void * stbl;
53  if (!cmap.size()) return 0;
54  if (TtfUtil::CheckCmapSubtable12(stbl = TtfUtil::FindCmapSubtable(cmap, 3, 10, cmap.size()), cmap + cmap.size())
55  || TtfUtil::CheckCmapSubtable12(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 4, cmap.size()), cmap + cmap.size()))
56  return stbl;
57  return 0;
58 }
59 
60 template <unsigned int (*NextCodePoint)(const void *, unsigned int, int *),
61  uint16 (*LookupCodePoint)(const void *, unsigned int, int)>
62 bool cache_subtable(uint16 * blocks[], const void * cst, const unsigned int limit)
63 {
64  int rangeKey = 0;
65  uint32 codePoint = NextCodePoint(cst, 0, &rangeKey),
66  prevCodePoint = 0;
67  while (codePoint < limit)
68  {
69  unsigned int block = codePoint >> 8;
70  if (!blocks[block])
71  {
72  blocks[block] = grzeroalloc<uint16>(0x100);
73  if (!blocks[block])
74  return false;
75  }
76  blocks[block][codePoint & 0xFF] = LookupCodePoint(cst, codePoint, rangeKey);
77  // prevent infinite loop
78  if (codePoint <= prevCodePoint)
79  codePoint = prevCodePoint + 1;
80  prevCodePoint = codePoint;
81  codePoint = NextCodePoint(cst, codePoint, &rangeKey);
82  }
83  return true;
84 }
85 
86 
87 CachedCmap::CachedCmap(const Face & face)
88 : m_isBmpOnly(true),
89  m_blocks(0)
90 {
92  if (!cmap) return;
93 
94  const void * bmp_cmap = bmp_subtable(cmap);
95  const void * smp_cmap = smp_subtable(cmap);
96  m_isBmpOnly = !smp_cmap;
97 
98  m_blocks = grzeroalloc<uint16 *>(m_isBmpOnly ? 0x100 : 0x1100);
99  if (m_blocks && smp_cmap)
100  {
101  if (!cache_subtable<TtfUtil::CmapSubtable12NextCodepoint, TtfUtil::CmapSubtable12Lookup>(m_blocks, smp_cmap, 0x10FFFF))
102  return;
103  }
104 
105  if (m_blocks && bmp_cmap)
106  {
107  if (!cache_subtable<TtfUtil::CmapSubtable4NextCodepoint, TtfUtil::CmapSubtable4Lookup>(m_blocks, bmp_cmap, 0xFFFF))
108  return;
109  }
110 }
111 
112 CachedCmap::~CachedCmap() throw()
113 {
114  if (!m_blocks) return;
115  unsigned int numBlocks = (m_isBmpOnly)? 0x100 : 0x1100;
116  for (unsigned int i = 0; i < numBlocks; i++)
117  free(m_blocks[i]);
118  free(m_blocks);
119 }
120 
121 uint16 CachedCmap::operator [] (const uint32 usv) const throw()
122 {
123  if ((m_isBmpOnly && usv > 0xFFFF) || (usv > 0x10FFFF))
124  return 0;
125  const uint32 block = 0xFFFF & (usv >> 8);
126  if (m_blocks[block])
127  return m_blocks[block][usv & 0xFF];
128  return 0;
129 };
130 
131 CachedCmap::operator bool() const throw()
132 {
133  return m_blocks != 0;
134 }
135 
136 
138 : _cmap(face, Tag::cmap),
139  _smp(smp_subtable(_cmap)),
140  _bmp(bmp_subtable(_cmap))
141 {
142 }
143 
144 uint16 DirectCmap::operator [] (const uint32 usv) const throw()
145 {
146  return usv > 0xFFFF
147  ? (_smp ? TtfUtil::CmapSubtable12Lookup(_smp, usv, 0) : 0)
148  : TtfUtil::CmapSubtable4Lookup(_bmp, usv, 0);
149 }
150 
151 DirectCmap::operator bool () const throw()
152 {
153  return _cmap && _bmp;
154 }
155 
#define bool
Definition: autosp.c:101
virtual uint16 operator[](const uint32 usv) const
Definition: CmapCache.cpp:121
uint16 ** m_blocks
Definition: CmapCache.h:79
DirectCmap(const DirectCmap &)
#define free(a)
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static int numBlocks
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FT_Face face
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#define true
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unsigned short uint16
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unsigned long uint32
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bool CheckCmapSubtable4(const void *pCmap31, const void *pCmapEnd)
Definition: TtfUtil.cpp:897
bool CheckCmapSubtable12(const void *pCmap310, const void *pCmapEnd)
Definition: TtfUtil.cpp:1091
gid16 CmapSubtable4Lookup(const void *pCmapSubtabel4, unsigned int nUnicodeId, int rangeKey=0)
Definition: TtfUtil.cpp:956
const void * FindCmapSubtable(const void *pCmap, int nPlatformId=3, int nEncodingId=1, size_t length=0)
Definition: TtfUtil.cpp:845
gid16 CmapSubtable12Lookup(const void *pCmap310, unsigned int uUnicodeId, int rangeKey=0)
Definition: TtfUtil.cpp:1126
Definition: bits.h:30
bool cache_subtable(uint16 *blocks[], const void *cst, const unsigned int limit)
Definition: CmapCache.cpp:62
const void * smp_subtable(const Face::Table &cmap)
Definition: CmapCache.cpp:50
const void * bmp_subtable(const Face::Table &cmap)
Definition: CmapCache.cpp:37
struct Table Table
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