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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 biased_subrs_t<CFF1Subrs> cff1_biased_subrs_t;
struct cff1_cs_interp_env_t : cs_interp_env_t<number_t, CFF1Subrs>
{
template <typename ACC>
cff1_cs_interp_env_t (const hb_ubytes_t &str, ACC &acc, unsigned int fd,
const int *coords_=nullptr, unsigned int num_coords_=0)
: SUPER (str, acc.globalSubrs, acc.privateDicts[fd].localSubrs)
{
processed_width = false;
has_width = false;
arg_start = 0;
in_seac = false;
}
void set_width (bool has_width_)
{
if (likely (!processed_width && (SUPER::argStack.get_count () > 0)))
{
if (has_width_)
{
width = SUPER::argStack[0];
has_width = true;
arg_start = 1;
}
}
processed_width = true;
}
void clear_args ()
{
arg_start = 0;
SUPER::clear_args ();
}
void set_in_seac (bool _in_seac) { in_seac = _in_seac; }
bool processed_width;
bool has_width;
unsigned int arg_start;
number_t width;
bool in_seac;
private:
typedef cs_interp_env_t<number_t, CFF1Subrs> SUPER;
};
template <typename OPSET, typename PARAM, typename PATH=path_procs_null_t<cff1_cs_interp_env_t, PARAM>>
struct cff1_cs_opset_t : cs_opset_t<number_t, OPSET, cff1_cs_interp_env_t, PARAM, PATH>
{
/* PostScript-originated legacy opcodes (OpCode_add etc) are unsupported */
/* Type 1-originated deprecated opcodes, seac behavior of endchar and dotsection are supported */
static void process_op (op_code_t op, cff1_cs_interp_env_t &env, PARAM& param)
{
switch (op) {
case OpCode_dotsection:
SUPER::flush_args_and_op (op, env, param);
break;
case OpCode_endchar:
OPSET::check_width (op, env, param);
if (env.argStack.get_count () >= 4)
{
OPSET::process_seac (env, param);
}
OPSET::flush_args_and_op (op, env, param);
env.set_endchar (true);
break;
default:
SUPER::process_op (op, env, param);
}
}
static void check_width (op_code_t op, cff1_cs_interp_env_t &env, PARAM& param)
{
if (!env.processed_width)
{
bool has_width = false;
switch (op)
{
case OpCode_endchar:
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;
}
env.set_width (has_width);
}
}
static void process_seac (cff1_cs_interp_env_t &env, PARAM& param)
{
}
static void flush_args (cff1_cs_interp_env_t &env, PARAM& param)
{
SUPER::flush_args (env, param);
env.clear_args (); /* pop off width */
}
private:
typedef cs_opset_t<number_t, OPSET, cff1_cs_interp_env_t, PARAM, PATH> SUPER;
};
template <typename OPSET, typename PARAM>
using cff1_cs_interpreter_t = cs_interpreter_t<cff1_cs_interp_env_t, OPSET, PARAM>;
} /* namespace CFF */
#endif /* HB_CFF1_INTERP_CS_HH */
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