harfbuzz/src/hb-cff1-interp-cs.hh

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/*
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* Copyright © 2018 Adobe Inc.
*
* 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_CFF1_INTERP_CS_HH
#define HB_CFF1_INTERP_CS_HH
#include "hb.hh"
#include "hb-cff-interp-cs-common.hh"
namespace CFF {
using namespace OT;
typedef BiasedSubrs<CFF1Subrs> CFF1BiasedSubrs;
struct CFF1CSInterpEnv : CSInterpEnv<Number, CFF1Subrs>
{
template <typename ACC>
inline void init (const ByteStr &str, ACC &acc, unsigned int fd)
{
SUPER::init (str, *acc.globalSubrs, *acc.privateDicts[fd].localSubrs);
processed_width = false;
has_width = false;
arg_start = 0;
}
inline void fini (void)
{
SUPER::fini ();
}
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inline void set_width (bool has_width_)
{
if (likely (!processed_width && (SUPER::argStack.get_count () > 0)))
{
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if (has_width_)
{
width = SUPER::argStack[0];
has_width = true;
arg_start = 1;
}
}
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processed_width = true;
}
inline void clear_args (void)
{
arg_start = 0;
SUPER::clear_args ();
}
bool processed_width;
bool has_width;
unsigned int arg_start;
Number width;
private:
typedef CSInterpEnv<Number, CFF1Subrs> SUPER;
};
template <typename OPSET, typename PARAM, typename PATH=PathProcsNull<CFF1CSInterpEnv, PARAM> >
struct CFF1CSOpSet : CSOpSet<Number, OPSET, CFF1CSInterpEnv, PARAM, PATH>
{
/* PostScript-originated legacy opcodes (OpCode_add etc) are unsupported */
static inline void check_width (OpCode op, CFF1CSInterpEnv &env, PARAM& param)
{
if (!env.processed_width)
{
bool has_width = false;
switch (op)
{
case OpCode_endchar:
has_width = (env.argStack.get_count () > 0);
break;
case OpCode_hstem:
case OpCode_hstemhm:
case OpCode_vstem:
case OpCode_vstemhm:
case OpCode_hintmask:
case OpCode_cntrmask:
has_width = ((env.argStack.get_count () & 1) != 0);
break;
case OpCode_hmoveto:
case OpCode_vmoveto:
has_width = (env.argStack.get_count () > 1);
break;
case OpCode_rmoveto:
has_width = (env.argStack.get_count () > 2);
break;
default:
return;
}
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env.set_width (has_width);
}
}
static inline void flush_args (CFF1CSInterpEnv &env, PARAM& param)
{
SUPER::flush_args (env, param);
env.clear_args (); /* pop off width */
}
private:
typedef CSOpSet<Number, OPSET, CFF1CSInterpEnv, PARAM, PATH> SUPER;
};
template <typename OPSET, typename PARAM>
struct CFF1CSInterpreter : CSInterpreter<CFF1CSInterpEnv, OPSET, PARAM> {};
} /* namespace CFF */
#endif /* HB_CFF1_INTERP_CS_HH */