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Diffstat (limited to 'gfx/graphite2/src/CmapCache.cpp')
| -rw-r--r-- | gfx/graphite2/src/CmapCache.cpp | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/gfx/graphite2/src/CmapCache.cpp b/gfx/graphite2/src/CmapCache.cpp new file mode 100644 index 000000000..d070019a3 --- /dev/null +++ b/gfx/graphite2/src/CmapCache.cpp @@ -0,0 +1,155 @@ +/* GRAPHITE2 LICENSING + + Copyright 2010, SIL International + All rights reserved. + + This library is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2.1 of License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should also have received a copy of the GNU Lesser General Public + License along with this library in the file named "LICENSE". + If not, write to the Free Software Foundation, 51 Franklin Street, + Suite 500, Boston, MA 02110-1335, USA or visit their web page on the + internet at http://www.fsf.org/licenses/lgpl.html. + +Alternatively, the contents of this file may be used under the terms of the +Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public +License, as published by the Free Software Foundation, either version 2 +of the License or (at your option) any later version. +*/ + +#include "inc/Main.h" +#include "inc/CmapCache.h" +#include "inc/Face.h" +#include "inc/TtfTypes.h" +#include "inc/TtfUtil.h" + + +using namespace graphite2; + +const void * bmp_subtable(const Face::Table & cmap) +{ + const void * stbl; + if (!cmap.size()) return 0; + if (TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 3, 1, cmap.size()), cmap + cmap.size()) + || TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 3, cmap.size()), cmap + cmap.size()) + || TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 2, cmap.size()), cmap + cmap.size()) + || TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 1, cmap.size()), cmap + cmap.size()) + || TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 0, cmap.size()), cmap + cmap.size())) + return stbl; + return 0; +} + +const void * smp_subtable(const Face::Table & cmap) +{ + const void * stbl; + if (!cmap.size()) return 0; + if (TtfUtil::CheckCmapSubtable12(stbl = TtfUtil::FindCmapSubtable(cmap, 3, 10, cmap.size()), cmap + cmap.size()) + || TtfUtil::CheckCmapSubtable12(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 4, cmap.size()), cmap + cmap.size())) + return stbl; + return 0; +} + +template <unsigned int (*NextCodePoint)(const void *, unsigned int, int *), + uint16 (*LookupCodePoint)(const void *, unsigned int, int)> +bool cache_subtable(uint16 * blocks[], const void * cst, const unsigned int limit) +{ + int rangeKey = 0; + uint32 codePoint = NextCodePoint(cst, 0, &rangeKey), + prevCodePoint = 0; + while (codePoint < limit) + { + unsigned int block = codePoint >> 8; + if (!blocks[block]) + { + blocks[block] = grzeroalloc<uint16>(0x100); + if (!blocks[block]) + return false; + } + blocks[block][codePoint & 0xFF] = LookupCodePoint(cst, codePoint, rangeKey); + // prevent infinite loop + if (codePoint <= prevCodePoint) + codePoint = prevCodePoint + 1; + prevCodePoint = codePoint; + codePoint = NextCodePoint(cst, codePoint, &rangeKey); + } + return true; +} + + +CachedCmap::CachedCmap(const Face & face) +: m_isBmpOnly(true), + m_blocks(0) +{ + const Face::Table cmap(face, Tag::cmap); + if (!cmap) return; + + const void * bmp_cmap = bmp_subtable(cmap); + const void * smp_cmap = smp_subtable(cmap); + m_isBmpOnly = !smp_cmap; + + m_blocks = grzeroalloc<uint16 *>(m_isBmpOnly ? 0x100 : 0x1100); + if (m_blocks && smp_cmap) + { + if (!cache_subtable<TtfUtil::CmapSubtable12NextCodepoint, TtfUtil::CmapSubtable12Lookup>(m_blocks, smp_cmap, 0x10FFFF)) + return; + } + + if (m_blocks && bmp_cmap) + { + if (!cache_subtable<TtfUtil::CmapSubtable4NextCodepoint, TtfUtil::CmapSubtable4Lookup>(m_blocks, bmp_cmap, 0xFFFF)) + return; + } +} + +CachedCmap::~CachedCmap() throw() +{ + if (!m_blocks) return; + unsigned int numBlocks = (m_isBmpOnly)? 0x100 : 0x1100; + for (unsigned int i = 0; i < numBlocks; i++) + free(m_blocks[i]); + free(m_blocks); +} + +uint16 CachedCmap::operator [] (const uint32 usv) const throw() +{ + if ((m_isBmpOnly && usv > 0xFFFF) || (usv > 0x10FFFF)) + return 0; + const uint32 block = 0xFFFF & (usv >> 8); + if (m_blocks[block]) + return m_blocks[block][usv & 0xFF]; + return 0; +}; + +CachedCmap::operator bool() const throw() +{ + return m_blocks != 0; +} + + +DirectCmap::DirectCmap(const Face & face) +: _cmap(face, Tag::cmap), + _smp(smp_subtable(_cmap)), + _bmp(bmp_subtable(_cmap)) +{ +} + +uint16 DirectCmap::operator [] (const uint32 usv) const throw() +{ + return usv > 0xFFFF + ? (_smp ? TtfUtil::CmapSubtable12Lookup(_smp, usv, 0) : 0) + : TtfUtil::CmapSubtable4Lookup(_bmp, usv, 0); +} + +DirectCmap::operator bool () const throw() +{ + return _cmap && _bmp; +} + |