harfbuzz/src/hb-subset-cff-common.hh

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/*
* Copyright © 2018 Adobe Systems Incorporated.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Adobe Author(s): Michiharu Ariza
*/
#ifndef HB_SUBSET_CFF_COMMON_PRIVATE_HH
#define HB_SUBSET_CFF_COMMON_PRIVATE_HH
#include "hb.hh"
#include "hb-subset-plan.hh"
#include "hb-cff-interp-cs-common.hh"
namespace CFF {
/* Used for writing a temporary charstring */
struct ByteStrBuff : hb_vector_t<char, 1>
{
inline bool encode_byte (unsigned char b)
{
return (push ((const char)b) != &Crap(char));
}
inline bool encode_num (const Number& n)
{
if (n.in_int_range ())
{
int v = n.to_int ();
if ((-1131 <= v) && (v <= 1131))
{
if ((-107 <= v) && (v <= 107))
return encode_byte (v + 139);
else if (v > 0)
{
v -= 108;
return encode_byte ((v >> 8) + OpCode_TwoBytePosInt0) && encode_byte (v & 0xFF);
}
else
{
v = -v - 108;
return encode_byte ((v >> 8) + OpCode_TwoByteNegInt0) && encode_byte (v & 0xFF);
}
}
assert ((v & ~0xFFFF) == 0);
return encode_byte (OpCode_shortint) &&
encode_byte ((v >> 8) & 0xFF) &&
encode_byte (v & 0xFF);
}
else
{
int32_t v = n.to_fixed ();
return encode_byte (OpCode_fixedcs) &&
encode_byte ((v >> 24) & 0xFF) &&
encode_byte ((v >> 16) & 0xFF) &&
encode_byte ((v >> 8) & 0xFF) &&
encode_byte (v & 0xFF);
}
}
inline bool encode_op (OpCode op)
{
if (Is_OpCode_ESC (op))
return encode_byte (OpCode_escape) &&
encode_byte (Unmake_OpCode_ESC (op));
else
return encode_byte (op);
}
};
struct ByteStrBuffArray : hb_vector_t<ByteStrBuff, 1>
{
inline void fini (void)
{
for (unsigned int i = 0; i < len; i++)
hb_vector_t<ByteStrBuff, 1>::operator[] (i).fini ();
hb_vector_t<ByteStrBuff, 1>::fini ();
}
};
template <typename ACCESSOR, typename ENV, typename OPSET>
struct SubrFlattener
{
inline SubrFlattener (const ACCESSOR &acc_, const hb_vector_t<hb_codepoint_t> &glyphs_)
: acc (acc_),
glyphs (glyphs_)
{}
inline bool flatten (ByteStrBuffArray &flat_charstrings)
{
if (!flat_charstrings.resize (glyphs.len))
return false;
for (unsigned int i = 0; i < glyphs.len; i++)
flat_charstrings[i].init ();
for (unsigned int i = 0; i < glyphs.len; i++)
{
hb_codepoint_t glyph = glyphs[i];
const ByteStr str = (*acc.charStrings)[glyph];
unsigned int fd = acc.fdSelect->get_fd (glyph);
CSInterpreter<ENV, OPSET, ByteStrBuff> interp;
interp.env.init (str, *acc.globalSubrs, *acc.privateDicts[fd].localSubrs);
if (unlikely (!interp.interpret (flat_charstrings[i])))
return false;
}
return true;
}
const ACCESSOR &acc;
const hb_vector_t<hb_codepoint_t> &glyphs;
};
struct SubrRefMaps
{
inline void init (void)
{
valid = false;
global_map = nullptr;
local_maps.init ();
}
inline void init (unsigned int fd_count)
{
valid = true;
global_map = hb_set_create ();
if (global_map == hb_set_get_empty ())
valid = false;
if (!local_maps.resize (fd_count))
valid = false;
for (unsigned int i = 0; i < local_maps.len; i++)
{
local_maps[i] = hb_set_create ();
if (local_maps[i] == hb_set_get_empty ())
valid = false;
}
}
inline void fini (void)
{
hb_set_destroy (global_map);
for (unsigned int i = 0; i < local_maps.len; i++)
hb_set_destroy (local_maps[i]);
local_maps.fini ();
}
bool is_valid (void) const { return valid; }
bool valid;
hb_set_t *global_map;
hb_vector_t<hb_set_t *> local_maps;
};
struct SubrRefMapPair
{
inline void init (void) {}
hb_set_t *global_map;
hb_set_t *local_map;
};
template <typename ACCESSOR, typename ENV, typename OPSET>
struct SubrSubsetter
{
inline SubrSubsetter (const ACCESSOR &acc_, const hb_vector_t<hb_codepoint_t> &glyphs_)
: acc (acc_),
glyphs (glyphs_)
{}
bool collect_refs (SubrRefMaps& refmaps /*OUT*/)
{
refmaps.init (acc.fdCount);
if (unlikely (!refmaps.valid)) return false;
for (unsigned int i = 0; i < glyphs.len; i++)
{
hb_codepoint_t glyph = glyphs[i];
const ByteStr str = (*acc.charStrings)[glyph];
unsigned int fd = acc.fdSelect->get_fd (glyph);
SubrRefMapPair pair = { refmaps.global_map, refmaps.local_maps[fd] };
CSInterpreter<ENV, OPSET, SubrRefMapPair> interp;
interp.env.init (str, *acc.globalSubrs, *acc.privateDicts[fd].localSubrs);
if (unlikely (!interp.interpret (pair)))
return false;
}
return true;
}
const ACCESSOR &acc;
const hb_vector_t<hb_codepoint_t> &glyphs;
};
}; /* namespace CFF */
HB_INTERNAL bool
hb_plan_subset_cff_fdselect (const hb_vector_t<hb_codepoint_t> &glyphs,
unsigned int fdCount,
const CFF::FDSelect &src, /* IN */
unsigned int &subset_fd_count /* OUT */,
unsigned int &subst_fdselect_size /* OUT */,
unsigned int &subst_fdselect_format /* OUT */,
hb_vector_t<hb_codepoint_t> &subst_first_glyphs /* OUT */,
CFF::FDMap &fdmap /* OUT */);
HB_INTERNAL bool
hb_serialize_cff_fdselect (hb_serialize_context_t *c,
const hb_vector_t<hb_codepoint_t> &glyphs,
const CFF::FDSelect &src,
unsigned int fd_count,
unsigned int fdselect_format,
unsigned int size,
const hb_vector_t<hb_codepoint_t> &first_glyphs,
const CFF::FDMap &fdmap);
#endif /* HB_SUBSET_CFF_COMMON_PRIVATE_HH */