hb-cff1-interp-cs.hh (4296B)
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 cff1_cs_interp_env_t (const hb_ubytes_t &str, ACC &acc, unsigned int fd, 42 const int *coords_=nullptr, unsigned int num_coords_=0) 43 : SUPER (str, acc.globalSubrs, acc.privateDicts[fd].localSubrs) 44 { 45 processed_width = false; 46 has_width = false; 47 arg_start = 0; 48 in_seac = false; 49 } 50 51 void set_width (bool has_width_) 52 { 53 if (likely (!processed_width && (SUPER::argStack.get_count () > 0))) 54 { 55 if (has_width_) 56 { 57 width = SUPER::argStack[0]; 58 has_width = true; 59 arg_start = 1; 60 } 61 } 62 processed_width = true; 63 } 64 65 void clear_args () 66 { 67 arg_start = 0; 68 SUPER::clear_args (); 69 } 70 71 void set_in_seac (bool _in_seac) { in_seac = _in_seac; } 72 73 bool processed_width; 74 bool has_width; 75 unsigned int arg_start; 76 number_t width; 77 bool in_seac; 78 79 private: 80 typedef cs_interp_env_t<number_t, CFF1Subrs> SUPER; 81 }; 82 83 template <typename OPSET, typename PARAM, typename PATH=path_procs_null_t<cff1_cs_interp_env_t, PARAM>> 84 struct cff1_cs_opset_t : cs_opset_t<number_t, OPSET, cff1_cs_interp_env_t, PARAM, PATH> 85 { 86 /* PostScript-originated legacy opcodes (OpCode_add etc) are unsupported */ 87 /* Type 1-originated deprecated opcodes, seac behavior of endchar and dotsection are supported */ 88 89 static void process_op (op_code_t op, cff1_cs_interp_env_t &env, PARAM& param) 90 { 91 switch (op) { 92 case OpCode_dotsection: 93 SUPER::flush_args_and_op (op, env, param); 94 break; 95 96 case OpCode_endchar: 97 OPSET::check_width (op, env, param); 98 if (env.argStack.get_count () >= 4) 99 { 100 OPSET::process_seac (env, param); 101 } 102 OPSET::flush_args_and_op (op, env, param); 103 env.set_endchar (true); 104 break; 105 106 default: 107 SUPER::process_op (op, env, param); 108 } 109 } 110 111 static void check_width (op_code_t op, cff1_cs_interp_env_t &env, PARAM& param) 112 { 113 if (!env.processed_width) 114 { 115 bool has_width = false; 116 switch (op) 117 { 118 case OpCode_endchar: 119 case OpCode_hstem: 120 case OpCode_hstemhm: 121 case OpCode_vstem: 122 case OpCode_vstemhm: 123 case OpCode_hintmask: 124 case OpCode_cntrmask: 125 has_width = ((env.argStack.get_count () & 1) != 0); 126 break; 127 case OpCode_hmoveto: 128 case OpCode_vmoveto: 129 has_width = (env.argStack.get_count () > 1); 130 break; 131 case OpCode_rmoveto: 132 has_width = (env.argStack.get_count () > 2); 133 break; 134 default: 135 return; 136 } 137 env.set_width (has_width); 138 } 139 } 140 141 static void process_seac (cff1_cs_interp_env_t &env, PARAM& param) 142 { 143 } 144 145 static void flush_args (cff1_cs_interp_env_t &env, PARAM& param) 146 { 147 SUPER::flush_args (env, param); 148 env.clear_args (); /* pop off width */ 149 } 150 151 private: 152 typedef cs_opset_t<number_t, OPSET, cff1_cs_interp_env_t, PARAM, PATH> SUPER; 153 }; 154 155 template <typename OPSET, typename PARAM> 156 using cff1_cs_interpreter_t = cs_interpreter_t<cff1_cs_interp_env_t, OPSET, PARAM>; 157 158 } /* namespace CFF */ 159 160 #endif /* HB_CFF1_INTERP_CS_HH */