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 #include "inc/GlyphFaceCache.h"
28 #include "graphite2/Font.h"
29 #include "inc/Face.h" //for the tags
30 #include "inc/Endian.h"
31
32 using namespace graphite2;
33
initialize(const Face & face,const bool dumb_font)34 /*virtual*/ bool GlyphFaceCacheHeader::initialize(const Face & face, const bool dumb_font) //return result indicates success. Do not use if failed.
35 {
36 if ((m_pLoca = face.getTable(Tag::loca, &m_lLoca)) == NULL) return false;
37 if ((m_pHead = face.getTable(Tag::head)) == NULL) return false;
38 if ((m_pGlyf = face.getTable(Tag::glyf, &m_lGlyf)) == NULL) return false;
39 if ((m_pHmtx = face.getTable(Tag::hmtx, &m_lHmtx)) == NULL) return false;
40 if ((m_pHHea = face.getTable(Tag::hhea)) == NULL) return false;
41
42 const void* pMaxp = face.getTable(Tag::maxp);
43 if (pMaxp == NULL) return false;
44 m_nGlyphs = m_nGlyphsWithGraphics = (unsigned short)TtfUtil::GlyphCount(pMaxp);
45 if (TtfUtil::LocaLookup(m_nGlyphs-1, m_pLoca, m_lLoca, m_pHead) == size_t(-1))
46 return false; // This will fail if m_nGlyphs is wildly out of range.
47
48 if (!dumb_font)
49 {
50 if ((m_pGlat = face.getTable(Tag::Glat, &m_lGlat)) == NULL) return false;
51 m_fGlat = be::peek<uint32>(m_pGlat);
52 size_t lGloc;
53 if ((m_pGloc = face.getTable(Tag::Gloc, &lGloc)) == NULL) return false;
54 if (lGloc < 6) return false;
55 int version = be::read<uint32>(m_pGloc);
56 if (version != 0x00010000) return false;
57
58 const uint16 locFlags = be::read<uint16>(m_pGloc);
59 m_numAttrs = be::read<uint16>(m_pGloc);
60 if (m_numAttrs > 0x1000) return false; // is this hard limit appropriate?
61
62 if (locFlags & 1)
63 {
64 m_locFlagsUse32Bit = true;
65 m_nGlyphsWithAttributes = (unsigned short)((lGloc - 12) / 4);
66 }
67 else
68 {
69 m_locFlagsUse32Bit = false;
70 m_nGlyphsWithAttributes = (unsigned short)((lGloc - 10) / 2);
71 }
72
73 if (m_nGlyphsWithAttributes > m_nGlyphs)
74 m_nGlyphs = m_nGlyphsWithAttributes;
75 }
76
77 return true;
78 }
79
makeCache(const GlyphFaceCacheHeader & hdr)80 GlyphFaceCache* GlyphFaceCache::makeCache(const GlyphFaceCacheHeader& hdr)
81 {
82 return new (hdr) GlyphFaceCache(hdr);
83 }
84
GlyphFaceCache(const GlyphFaceCacheHeader & hdr)85 GlyphFaceCache::GlyphFaceCache(const GlyphFaceCacheHeader& hdr)
86 : GlyphFaceCacheHeader(hdr)
87 {
88 unsigned int nGlyphs = numGlyphs();
89
90 for (unsigned int i = 0; i < nGlyphs; i++)
91 {
92 *glyphPtrDirect(i) = NULL;
93 }
94 }
95
~GlyphFaceCache()96 GlyphFaceCache::~GlyphFaceCache()
97 {
98 unsigned int nGlyphs = numGlyphs();
99 int deltaPointers = (*glyphPtrDirect(nGlyphs-1u) - *glyphPtrDirect(0u));
100 if ((nGlyphs > 0u) && (deltaPointers == static_cast<int>(nGlyphs - 1)))
101 {
102 for (unsigned int i=0 ; i<nGlyphs; ++i)
103 {
104 GlyphFace *p = *glyphPtrDirect(i);
105 assert (p);
106 p->~GlyphFace();
107 }
108 free (*glyphPtrDirect(0));
109 }
110 else
111 {
112 for (unsigned int i=0 ; i<nGlyphs; ++i)
113 {
114 GlyphFace *p = *glyphPtrDirect(i);
115 if (p)
116 {
117 p->~GlyphFace();
118 free(p);
119 }
120 }
121 }
122 }
123
loadAllGlyphs()124 void GlyphFaceCache::loadAllGlyphs()
125 {
126 unsigned int nGlyphs = numGlyphs();
127 // size_t sparse_size = 0;
128 GlyphFace * glyphs = gralloc<GlyphFace>(nGlyphs);
129 for (unsigned short glyphid = 0; glyphid < nGlyphs; glyphid++)
130 {
131 GlyphFace **p = glyphPtrDirect(glyphid);
132 *p = &(glyphs[glyphid]);
133 new(*p) GlyphFace(*this, glyphid);
134 // sparse_size += (*p)->m_attrs._sizeof();
135 }
136 // const size_t flat_size = nGlyphs*(sizeof(uint16*) + sizeof(uint16)*numAttrs());
137 // assert(sparse_size <= flat_size);
138 }
139
glyph(unsigned short glyphid) const140 /*virtual*/ const GlyphFace *GlyphFaceCache::glyph(unsigned short glyphid) const //result may be changed by subsequent call with a different glyphid
141 {
142 GlyphFace **p = glyphPtrDirect(glyphid);
143 if (*p)
144 return *p;
145
146 *p = (GlyphFace*)malloc(sizeof(GlyphFace));
147 new(*p) GlyphFace(*this, glyphid);
148 return *p;
149 }
150