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// SPDX-License-Identifier: MIT OR MPL-2.0 OR LGPL-2.1-or-later OR GPL-2.0-or-later
// Copyright 2010, SIL International, All rights reserved.
#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;
}
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