133 lines
3.9 KiB
C++
133 lines
3.9 KiB
C++
// SPDX-License-Identifier: MIT
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// Copyright 2010, SIL International, All rights reserved.
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#include "inc/Main.h"
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#include "inc/CmapCache.h"
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#include "inc/Face.h"
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#include "inc/TtfTypes.h"
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#include "inc/TtfUtil.h"
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using namespace graphite2;
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const void * bmp_subtable(const Face::Table & cmap)
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{
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const void * stbl;
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if (!cmap.size()) return 0;
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if (TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 3, 1, cmap.size()), cmap + cmap.size())
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|| TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 3, cmap.size()), cmap + cmap.size())
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|| TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 2, cmap.size()), cmap + cmap.size())
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|| TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 1, cmap.size()), cmap + cmap.size())
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|| TtfUtil::CheckCmapSubtable4(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 0, cmap.size()), cmap + cmap.size()))
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return stbl;
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return 0;
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}
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const void * smp_subtable(const Face::Table & cmap)
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{
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const void * stbl;
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if (!cmap.size()) return 0;
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if (TtfUtil::CheckCmapSubtable12(stbl = TtfUtil::FindCmapSubtable(cmap, 3, 10, cmap.size()), cmap + cmap.size())
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|| TtfUtil::CheckCmapSubtable12(stbl = TtfUtil::FindCmapSubtable(cmap, 0, 4, cmap.size()), cmap + cmap.size()))
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return stbl;
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return 0;
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}
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template <unsigned int (*NextCodePoint)(const void *, unsigned int, int *),
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uint16_t (*LookupCodePoint)(const void *, unsigned int, int)>
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bool cache_subtable(uint16_t * blocks[], const void * cst, const unsigned int limit)
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{
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int rangeKey = 0;
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uint32_t codePoint = NextCodePoint(cst, 0, &rangeKey),
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prevCodePoint = 0;
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while (codePoint < limit)
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{
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unsigned int block = codePoint >> 8;
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if (!blocks[block])
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{
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blocks[block] = grzeroalloc<uint16_t>(0x100);
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if (!blocks[block])
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return false;
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}
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blocks[block][codePoint & 0xFF] = LookupCodePoint(cst, codePoint, rangeKey);
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// prevent infinite loop
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if (codePoint <= prevCodePoint)
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codePoint = prevCodePoint + 1;
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prevCodePoint = codePoint;
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codePoint = NextCodePoint(cst, codePoint, &rangeKey);
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}
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return true;
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}
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CachedCmap::CachedCmap(const Face & face)
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: m_isBmpOnly(true),
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m_blocks(0)
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{
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const Face::Table cmap(face, Tag::cmap);
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if (!cmap) return;
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const void * bmp_cmap = bmp_subtable(cmap);
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const void * smp_cmap = smp_subtable(cmap);
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m_isBmpOnly = !smp_cmap;
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m_blocks = grzeroalloc<uint16_t *>(m_isBmpOnly ? 0x100 : 0x1100);
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if (m_blocks && smp_cmap)
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{
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if (!cache_subtable<TtfUtil::CmapSubtable12NextCodepoint, TtfUtil::CmapSubtable12Lookup>(m_blocks, smp_cmap, 0x10FFFF))
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return;
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}
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if (m_blocks && bmp_cmap)
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{
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if (!cache_subtable<TtfUtil::CmapSubtable4NextCodepoint, TtfUtil::CmapSubtable4Lookup>(m_blocks, bmp_cmap, 0xFFFF))
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return;
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}
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}
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CachedCmap::~CachedCmap() throw()
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{
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if (!m_blocks) return;
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unsigned int numBlocks = (m_isBmpOnly)? 0x100 : 0x1100;
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for (unsigned int i = 0; i < numBlocks; i++)
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free(m_blocks[i]);
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free(m_blocks);
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}
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uint16_t CachedCmap::operator [] (const uint32_t usv) const throw()
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{
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if ((m_isBmpOnly && usv > 0xFFFF) || (usv > 0x10FFFF))
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return 0;
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const uint32_t block = 0xFFFF & (usv >> 8);
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if (m_blocks[block])
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return m_blocks[block][usv & 0xFF];
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return 0;
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};
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CachedCmap::operator bool() const throw()
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{
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return m_blocks != 0;
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}
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DirectCmap::DirectCmap(const Face & face)
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: _cmap(face, Tag::cmap),
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_smp(smp_subtable(_cmap)),
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_bmp(bmp_subtable(_cmap))
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{
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}
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uint16_t DirectCmap::operator [] (const uint32_t usv) const throw()
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{
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return usv > 0xFFFF
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? (_smp ? TtfUtil::CmapSubtable12Lookup(_smp, usv, 0) : 0)
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: TtfUtil::CmapSubtable4Lookup(_bmp, usv, 0);
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}
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DirectCmap::operator bool () const throw()
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{
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return _cmap && _bmp;
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}
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