2 * Copyright © 2018 Adobe Inc.
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10 * all copies of this software.
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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24 * Adobe Author(s): Michiharu Ariza
26 #ifndef HB_CFF2_INTERP_CS_HH
27 #define HB_CFF2_INTERP_CS_HH
30 #include "hb-cff-interp-cs-common.hh"
36 struct blend_arg_t : number_t
38 void set_int (int v) { reset_blends (); number_t::set_int (v); }
39 void set_fixed (int32_t v) { reset_blends (); number_t::set_fixed (v); }
40 void set_real (double v) { reset_blends (); number_t::set_real (v); }
42 void set_blends (unsigned int numValues_, unsigned int valueIndex_,
43 unsigned int numBlends, hb_array_t<const blend_arg_t> blends_)
45 numValues = numValues_;
46 valueIndex = valueIndex_;
47 deltas.resize (numBlends);
48 for (unsigned int i = 0; i < numBlends; i++)
49 deltas[i] = blends_[i];
52 bool blending () const { return deltas.length > 0; }
55 numValues = valueIndex = 0;
59 unsigned int numValues;
60 unsigned int valueIndex;
61 hb_vector_t<number_t> deltas;
64 typedef interp_env_t<blend_arg_t> BlendInterpEnv;
65 typedef biased_subrs_t<CFF2Subrs> cff2_biased_subrs_t;
67 struct cff2_cs_interp_env_t : cs_interp_env_t<blend_arg_t, CFF2Subrs>
69 template <typename ACC>
70 void init (const byte_str_t &str, ACC &acc, unsigned int fd,
71 const int *coords_=nullptr, unsigned int num_coords_=0)
73 SUPER::init (str, acc.globalSubrs, acc.privateDicts[fd].localSubrs);
76 num_coords = num_coords_;
77 varStore = acc.varStore;
79 seen_vsindex_ = false;
81 do_blend = num_coords && coords && varStore->size;
82 set_ivs (acc.privateDicts[fd].ivs);
93 if (this->str_ref.avail ())
94 return SUPER::fetch_op ();
96 /* make up return or endchar op */
97 if (this->callStack.is_empty ())
98 return OpCode_endchar;
100 return OpCode_return;
103 const blend_arg_t& eval_arg (unsigned int i)
105 blend_arg_t &arg = argStack[i];
110 const blend_arg_t& pop_arg ()
112 blend_arg_t &arg = argStack.pop ();
117 void process_blend ()
121 region_count = varStore->varStore.get_region_index_count (get_ivs ());
124 if (unlikely (!scalars.resize (region_count)))
127 varStore->varStore.get_region_scalars (get_ivs (), coords, num_coords,
128 &scalars[0], region_count);
134 void process_vsindex ()
136 unsigned int index = argStack.pop_uint ();
137 if (unlikely (seen_vsindex () || seen_blend))
145 seen_vsindex_ = true;
148 unsigned int get_region_count () const { return region_count; }
149 void set_region_count (unsigned int region_count_) { region_count = region_count_; }
150 unsigned int get_ivs () const { return ivs; }
151 void set_ivs (unsigned int ivs_) { ivs = ivs_; }
152 bool seen_vsindex () const { return seen_vsindex_; }
155 void blend_arg (blend_arg_t &arg)
157 if (do_blend && arg.blending ())
159 if (likely (scalars.length == arg.deltas.length))
161 double v = arg.to_real ();
162 for (unsigned int i = 0; i < scalars.length; i++)
164 v += (double)scalars[i] * arg.deltas[i].to_real ();
167 arg.deltas.resize (0);
174 unsigned int num_coords;
175 const CFF2VariationStore *varStore;
176 unsigned int region_count;
178 hb_vector_t<float> scalars;
183 typedef cs_interp_env_t<blend_arg_t, CFF2Subrs> SUPER;
185 template <typename OPSET, typename PARAM, typename PATH=path_procs_null_t<cff2_cs_interp_env_t, PARAM>>
186 struct cff2_cs_opset_t : cs_opset_t<blend_arg_t, OPSET, cff2_cs_interp_env_t, PARAM, PATH>
188 static void process_op (op_code_t op, cff2_cs_interp_env_t &env, PARAM& param)
191 case OpCode_callsubr:
192 case OpCode_callgsubr:
193 /* a subroutine number shouldn't be a blended value */
194 if (unlikely (env.argStack.peek ().blending ()))
199 SUPER::process_op (op, env, param);
203 OPSET::process_blend (env, param);
206 case OpCode_vsindexcs:
207 if (unlikely (env.argStack.peek ().blending ()))
212 OPSET::process_vsindex (env, param);
216 SUPER::process_op (op, env, param);
220 static void process_blend (cff2_cs_interp_env_t &env, PARAM& param)
224 env.process_blend ();
225 k = env.get_region_count ();
226 n = env.argStack.pop_uint ();
227 /* copy the blend values into blend array of the default values */
228 unsigned int start = env.argStack.get_count () - ((k+1) * n);
229 /* let an obvious error case fail, but note CFF2 spec doesn't forbid n==0 */
230 if (unlikely (start > env.argStack.get_count ()))
235 for (unsigned int i = 0; i < n; i++)
237 const hb_array_t<const blend_arg_t> blends = env.argStack.get_subarray (start + n + (i * k));
238 env.argStack[start + i].set_blends (n, i, k, blends);
241 /* pop off blend values leaving default values now adorned with blend values */
242 env.argStack.pop (k * n);
245 static void process_vsindex (cff2_cs_interp_env_t &env, PARAM& param)
247 env.process_vsindex ();
252 typedef cs_opset_t<blend_arg_t, OPSET, cff2_cs_interp_env_t, PARAM, PATH> SUPER;
255 template <typename OPSET, typename PARAM>
256 struct cff2_cs_interpreter_t : cs_interpreter_t<cff2_cs_interp_env_t, OPSET, PARAM> {};
258 } /* namespace CFF */
260 #endif /* HB_CFF2_INTERP_CS_HH */