kc3-lang/harfbuzz/src/hb-cff1-interp-cs.hh

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• Hash : c632a164
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  Date : 2023-01-06T11:01:25
  

  [subset/cff] Support instancing
  

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• src/hb-cff1-interp-cs.hh

• /*
   * 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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