summaryrefslogtreecommitdiffstats
path: root/src/3rdparty/harfbuzz-ng/src/hb-cff2-interp-cs.hh
blob: 332ece31cd4fde452ebe96717259f1dcd0a50f65 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
/*
 * 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_CFF2_INTERP_CS_HH
#define HB_CFF2_INTERP_CS_HH

#include "hb.hh"
#include "hb-cff-interp-cs-common.hh"

namespace CFF {

using namespace OT;

struct blend_arg_t : number_t
{
  void init ()
  {
    number_t::init ();
    deltas.init ();
  }

  void fini ()
  {
    number_t::fini ();
    deltas.fini_deep ();
  }

  void set_int (int v) { reset_blends (); number_t::set_int (v); }
  void set_fixed (int32_t v) { reset_blends (); number_t::set_fixed (v); }
  void set_real (double v) { reset_blends (); number_t::set_real (v); }

  void set_blends (unsigned int numValues_, unsigned int valueIndex_,
		   unsigned int numBlends, hb_array_t<const blend_arg_t> blends_)
  {
    numValues = numValues_;
    valueIndex = valueIndex_;
    deltas.resize (numBlends);
    for (unsigned int i = 0; i < numBlends; i++)
      deltas[i] = blends_[i];
  }

  bool blending () const { return deltas.length > 0; }
  void reset_blends ()
  {
    numValues = valueIndex = 0;
    deltas.resize (0);
  }

  unsigned int numValues;
  unsigned int valueIndex;
  hb_vector_t<number_t> deltas;
};

typedef interp_env_t<blend_arg_t> BlendInterpEnv;
typedef biased_subrs_t<CFF2Subrs>   cff2_biased_subrs_t;

struct cff2_cs_interp_env_t : cs_interp_env_t<blend_arg_t, CFF2Subrs>
{
  template <typename ACC>
  void init (const byte_str_t &str, ACC &acc, unsigned int fd,
	     const int *coords_=nullptr, unsigned int num_coords_=0)
  {
    SUPER::init (str, acc.globalSubrs, acc.privateDicts[fd].localSubrs);

    coords = coords_;
    num_coords = num_coords_;
    varStore = acc.varStore;
    seen_blend = false;
    seen_vsindex_ = false;
    scalars.init ();
    do_blend = num_coords && coords && varStore->size;
    set_ivs (acc.privateDicts[fd].ivs);
  }

  void fini ()
  {
    scalars.fini ();
    SUPER::fini ();
  }

  op_code_t fetch_op ()
  {
    if (this->str_ref.avail ())
      return SUPER::fetch_op ();

    /* make up return or endchar op */
    if (this->callStack.is_empty ())
      return OpCode_endchar;
    else
      return OpCode_return;
  }

  const blend_arg_t& eval_arg (unsigned int i)
  {
    blend_arg_t  &arg = argStack[i];
    blend_arg (arg);
    return arg;
  }

  const blend_arg_t& pop_arg ()
  {
    blend_arg_t  &arg = argStack.pop ();
    blend_arg (arg);
    return arg;
  }

  void process_blend ()
  {
    if (!seen_blend)
    {
      region_count = varStore->varStore.get_region_index_count (get_ivs ());
      if (do_blend)
      {
	if (unlikely (!scalars.resize (region_count)))
	  set_error ();
	else
	  varStore->varStore.get_scalars (get_ivs (), coords, num_coords,
					  &scalars[0], region_count);
      }
      seen_blend = true;
    }
  }

  void process_vsindex ()
  {
    unsigned int  index = argStack.pop_uint ();
    if (unlikely (seen_vsindex () || seen_blend))
    {
      set_error ();
    }
    else
    {
      set_ivs (index);
    }
    seen_vsindex_ = true;
  }

  unsigned int get_region_count () const { return region_count; }
  void	 set_region_count (unsigned int region_count_) { region_count = region_count_; }
  unsigned int get_ivs () const { return ivs; }
  void	 set_ivs (unsigned int ivs_) { ivs = ivs_; }
  bool	 seen_vsindex () const { return seen_vsindex_; }

  protected:
  void blend_arg (blend_arg_t &arg)
  {
    if (do_blend && arg.blending ())
    {
      if (likely (scalars.length == arg.deltas.length))
      {
	double v = arg.to_real ();
	for (unsigned int i = 0; i < scalars.length; i++)
	{
	  v += (double)scalars[i] * arg.deltas[i].to_real ();
	}
	arg.set_real (v);
	arg.deltas.resize (0);
      }
    }
  }

  protected:
  const int     *coords;
  unsigned int  num_coords;
  const	 CFF2VariationStore *varStore;
  unsigned int  region_count;
  unsigned int  ivs;
  hb_vector_t<float>  scalars;
  bool	  do_blend;
  bool	  seen_vsindex_;
  bool	  seen_blend;

  typedef cs_interp_env_t<blend_arg_t, CFF2Subrs> SUPER;
};
template <typename OPSET, typename PARAM, typename PATH=path_procs_null_t<cff2_cs_interp_env_t, PARAM>>
struct cff2_cs_opset_t : cs_opset_t<blend_arg_t, OPSET, cff2_cs_interp_env_t, PARAM, PATH>
{
  static void process_op (op_code_t op, cff2_cs_interp_env_t &env, PARAM& param)
  {
    switch (op) {
      case OpCode_callsubr:
      case OpCode_callgsubr:
	/* a subroutine number shoudln't be a blended value */
	if (unlikely (env.argStack.peek ().blending ()))
	{
	  env.set_error ();
	  break;
	}
	SUPER::process_op (op, env, param);
	break;

      case OpCode_blendcs:
	OPSET::process_blend (env, param);
	break;

      case OpCode_vsindexcs:
	if (unlikely (env.argStack.peek ().blending ()))
	{
	  env.set_error ();
	  break;
	}
	OPSET::process_vsindex (env, param);
	break;

      default:
	SUPER::process_op (op, env, param);
    }
  }

  static void process_blend (cff2_cs_interp_env_t &env, PARAM& param)
  {
    unsigned int n, k;

    env.process_blend ();
    k = env.get_region_count ();
    n = env.argStack.pop_uint ();
    /* copy the blend values into blend array of the default values */
    unsigned int start = env.argStack.get_count () - ((k+1) * n);
    /* let an obvious error case fail, but note CFF2 spec doesn't forbid n==0 */
    if (unlikely (start > env.argStack.get_count ()))
    {
      env.set_error ();
      return;
    }
    for (unsigned int i = 0; i < n; i++)
    {
      const hb_array_t<const blend_arg_t>	blends = env.argStack.get_subarray (start + n + (i * k));
      env.argStack[start + i].set_blends (n, i, k, blends);
    }

    /* pop off blend values leaving default values now adorned with blend values */
    env.argStack.pop (k * n);
  }

  static void process_vsindex (cff2_cs_interp_env_t &env, PARAM& param)
  {
    env.process_vsindex ();
    env.clear_args ();
  }

  private:
  typedef cs_opset_t<blend_arg_t, OPSET, cff2_cs_interp_env_t, PARAM, PATH>  SUPER;
};

template <typename OPSET, typename PARAM>
struct cff2_cs_interpreter_t : cs_interpreter_t<cff2_cs_interp_env_t, OPSET, PARAM> {};

} /* namespace CFF */

#endif /* HB_CFF2_INTERP_CS_HH */