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

   1 /*
   2  * Copyright © 2018 Adobe Inc.
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  *
  24  * Adobe Author(s): Michiharu Ariza
  25  */
  26 #ifndef HB_CFF1_INTERP_CS_HH
  27 #define HB_CFF1_INTERP_CS_HH
  28
  29 #include "hb.hh"
  30 #include "hb-cff-interp-cs-common.hh"
  31
  32 namespace CFF {
  33
  34 using namespace OT;
  35
  36 typedef biased_subrs_t<CFF1Subrs>   cff1_biased_subrs_t;
  37
  38 struct cff1_cs_interp_env_t : cs_interp_env_t<number_t, CFF1Subrs>
  39 {
  40   template <typename ACC>
  41   void init (const byte_str_t &str, ACC &acc, unsigned int fd)
  42   {
  43     SUPER::init (str, acc.globalSubrs, acc.privateDicts[fd].localSubrs);
  44     processed_width = false;
  45     has_width = false;
  46     arg_start = 0;
  47     in_seac = false;
  48   }
  49
  50   void fini () { SUPER::fini (); }
  51
  52   void set_width (bool has_width_)
  53   {
  54     if (likely (!processed_width && (SUPER::argStack.get_count () > 0)))
  55     {
  56       if (has_width_)
  57       {
  58         width = SUPER::argStack[0];
  59         has_width = true;
  60         arg_start = 1;
  61       }
  62     }
  63     processed_width = true;
  64   }
  65
  66   void clear_args ()
  67   {
  68     arg_start = 0;
  69     SUPER::clear_args ();
  70   }
  71
  72   void set_in_seac (bool _in_seac) { in_seac = _in_seac; }
  73
  74   bool    processed_width;
  75   bool    has_width;
  76   unsigned int  arg_start;
  77   number_t      width;
  78   bool    in_seac;
  79
  80   private:
  81   typedef cs_interp_env_t<number_t, CFF1Subrs> SUPER;
  82 };
  83
  84 template <typename OPSET, typename PARAM, typename PATH=path_procs_null_t<cff1_cs_interp_env_t, PARAM>>
  85 struct cff1_cs_opset_t : cs_opset_t<number_t, OPSET, cff1_cs_interp_env_t, PARAM, PATH>
  86 {
  87   /* PostScript-originated legacy opcodes (OpCode_add etc) are unsupported */
  88   /* Type 1-originated deprecated opcodes, seac behavior of endchar and dotsection are supported */
  89
  90   static void process_op (op_code_t op, cff1_cs_interp_env_t &env, PARAM& param)
  91   {
  92     switch (op) {
  93       case OpCode_dotsection:
  94         SUPER::flush_args_and_op (op, env, param);
  95         break;
  96
  97       case OpCode_endchar:
  98         OPSET::check_width (op, env, param);
  99         if (env.argStack.get_count () >= 4)
 100         {
 101           OPSET::process_seac (env, param);
 102         }
 103         OPSET::flush_args_and_op (op, env, param);
 104         env.set_endchar (true);
 105         break;
 106
 107       default:
 108         SUPER::process_op (op, env, param);
 109     }
 110   }
 111
 112   static void check_width (op_code_t op, cff1_cs_interp_env_t &env, PARAM& param)
 113   {
 114     if (!env.processed_width)
 115     {
 116       bool  has_width = false;
 117       switch (op)
 118       {
 119         case OpCode_endchar:
 120         case OpCode_hstem:
 121         case OpCode_hstemhm:
 122         case OpCode_vstem:
 123         case OpCode_vstemhm:
 124         case OpCode_hintmask:
 125         case OpCode_cntrmask:
 126           has_width = ((env.argStack.get_count () & 1) != 0);
 127           break;
 128         case OpCode_hmoveto:
 129         case OpCode_vmoveto:
 130           has_width = (env.argStack.get_count () > 1);
 131           break;
 132         case OpCode_rmoveto:
 133           has_width = (env.argStack.get_count () > 2);
 134           break;
 135         default:
 136           return;
 137       }
 138       env.set_width (has_width);
 139     }
 140   }
 141
 142   static void process_seac (cff1_cs_interp_env_t &env, PARAM& param)
 143   {
 144   }
 145
 146   static void flush_args (cff1_cs_interp_env_t &env, PARAM& param)
 147   {
 148     SUPER::flush_args (env, param);
 149     env.clear_args ();  /* pop off width */
 150   }
 151
 152   private:
 153   typedef cs_opset_t<number_t, OPSET, cff1_cs_interp_env_t, PARAM, PATH>  SUPER;
 154 };
 155
 156 template <typename OPSET, typename PARAM>
 157 struct cff1_cs_interpreter_t : cs_interpreter_t<cff1_cs_interp_env_t, OPSET, PARAM> {};
 158
 159 } /* namespace CFF */
 160
 161 #endif /* HB_CFF1_INTERP_CS_HH */