summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-0.9.7/src/hb-coretext.cc
blob: dfb6341dc61766b5523928cd532eca68d933abe4 (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
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/*
 * Copyright © 2012  Mozilla Foundation.
 * Copyright © 2012  Google, 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.
 *
 * Mozilla Author(s): Jonathan Kew
 * Google Author(s): Behdad Esfahbod
 */

#define HB_SHAPER coretext
#include "hb-shaper-impl-private.hh"

#define GlyphID GlyphID_mac
#include <ApplicationServices/ApplicationServices.h>
#undef GlyphID

#include "hb-coretext.h"


#ifndef HB_DEBUG_CORETEXT
#define HB_DEBUG_CORETEXT (HB_DEBUG+0)
#endif


HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face)
HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font)


/*
 * shaper face data
 */

struct hb_coretext_shaper_face_data_t {
  CGFontRef cg_font;
};

static void
release_data (void *info, const void *data, size_t size)
{
  assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
          hb_blob_get_data ((hb_blob_t *) info, NULL) == data);

  hb_blob_destroy ((hb_blob_t *) info);
}

hb_coretext_shaper_face_data_t *
_hb_coretext_shaper_face_data_create (hb_face_t *face)
{
  hb_coretext_shaper_face_data_t *data = (hb_coretext_shaper_face_data_t *) calloc (1, sizeof (hb_coretext_shaper_face_data_t));
  if (unlikely (!data))
    return NULL;

  hb_blob_t *blob = hb_face_reference_blob (face);
  unsigned int blob_length;
  const char *blob_data = hb_blob_get_data (blob, &blob_length);
  if (unlikely (!blob_length))
    DEBUG_MSG (CORETEXT, face, "Face has empty blob");

  CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);
  data->cg_font = CGFontCreateWithDataProvider (provider);
  CGDataProviderRelease (provider);

  if (unlikely (!data->cg_font)) {
    DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
    free (data);
    return NULL;
  }

  return data;
}

void
_hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data)
{
  CFRelease (data->cg_font);
  free (data);
}


/*
 * shaper font data
 */

struct hb_coretext_shaper_font_data_t {
  CTFontRef ct_font;
};

hb_coretext_shaper_font_data_t *
_hb_coretext_shaper_font_data_create (hb_font_t *font)
{
  if (unlikely (!hb_coretext_shaper_face_data_ensure (font->face))) return NULL;

  hb_coretext_shaper_font_data_t *data = (hb_coretext_shaper_font_data_t *) calloc (1, sizeof (hb_coretext_shaper_font_data_t));
  if (unlikely (!data))
    return NULL;

  hb_face_t *face = font->face;
  hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);

  data->ct_font = CTFontCreateWithGraphicsFont (face_data->cg_font, font->y_scale, NULL, NULL);
  if (unlikely (!data->ct_font)) {
    DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed");
    free (data);
    return NULL;
  }

  return data;
}

void
_hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data)
{
  CFRelease (data->ct_font);
  free (data);
}


/*
 * shaper shape_plan data
 */

struct hb_coretext_shaper_shape_plan_data_t {};

hb_coretext_shaper_shape_plan_data_t *
_hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,
					     const hb_feature_t *user_features HB_UNUSED,
					     unsigned int        num_user_features HB_UNUSED)
{
  return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}

void
_hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED)
{
}


/*
 * shaper
 */

CTFontRef
hb_coretext_font_get_ct_font (hb_font_t *font)
{
  if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return 0;
  hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
  return font_data->ct_font;
}

hb_bool_t
_hb_coretext_shape (hb_shape_plan_t    *shape_plan,
		    hb_font_t          *font,
                    hb_buffer_t        *buffer,
                    const hb_feature_t *features,
                    unsigned int        num_features)
{
  hb_face_t *face = font->face;
  hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
  hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);

#define FAIL(...) \
  HB_STMT_START { \
    DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \
    return false; \
  } HB_STMT_END;

  unsigned int scratch_size;
  char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);

#define utf16_index() var1.u32

  UniChar *pchars = (UniChar *) scratch;
  unsigned int chars_len = 0;
  for (unsigned int i = 0; i < buffer->len; i++) {
    hb_codepoint_t c = buffer->info[i].codepoint;
    buffer->info[i].utf16_index() = chars_len;
    if (likely (c < 0x10000))
      pchars[chars_len++] = c;
    else if (unlikely (c >= 0x110000))
      pchars[chars_len++] = 0xFFFD;
    else {
      pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10);
      pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
    }
  }

#undef utf16_index

  CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (kCFAllocatorDefault,
                                                               pchars, chars_len,
                                                               kCFAllocatorNull);

  CFDictionaryRef attrs = CFDictionaryCreate (kCFAllocatorDefault,
                                              (const void**) &kCTFontAttributeName,
                                              (const void**) &font_data->ct_font,
                                              1, /* count of attributes */
                                              &kCFTypeDictionaryKeyCallBacks,
                                              &kCFTypeDictionaryValueCallBacks);

  /* TODO: support features */

  CFAttributedStringRef attr_string = CFAttributedStringCreate (kCFAllocatorDefault, string_ref, attrs);
  CFRelease (string_ref);
  CFRelease (attrs);

  CTLineRef line = CTLineCreateWithAttributedString (attr_string);
  CFRelease (attr_string);

  CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
  unsigned int num_runs = CFArrayGetCount (glyph_runs);

  bool success = true;
  buffer->len = 0;

  const CFRange range_all = CFRangeMake (0, 0);

  for (unsigned int i = 0; i < num_runs; i++) {
    CTRunRef run = (CTRunRef) CFArrayGetValueAtIndex (glyph_runs, i);

    unsigned int num_glyphs = CTRunGetGlyphCount (run);
    if (num_glyphs == 0)
      continue;

    buffer->ensure (buffer->len + num_glyphs);

    /* Testing indicates that CTRunGetGlyphsPtr (almost?) always succeeds,
     * and so copying data to our own buffer with CTRunGetGlyphs will be
     * extremely rare. */

    unsigned int scratch_size;
    char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);

#define ALLOCATE_ARRAY(Type, name, len) \
  Type *name = (Type *) scratch; \
  scratch += (len) * sizeof ((name)[0]); \
  scratch_size -= (len) * sizeof ((name)[0]);

    const CGGlyph* glyphs = CTRunGetGlyphsPtr (run);
    if (!glyphs) {
      ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs);
      CTRunGetGlyphs (run, range_all, glyph_buf);
      glyphs = glyph_buf;
    }

    const CGPoint* positions = CTRunGetPositionsPtr (run);
    if (!positions) {
      ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs);
      CTRunGetPositions (run, range_all, position_buf);
      positions = position_buf;
    }

    const CFIndex* string_indices = CTRunGetStringIndicesPtr (run);
    if (!string_indices) {
      ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs);
      CTRunGetStringIndices (run, range_all, index_buf);
      string_indices = index_buf;
    }

#undef ALLOCATE_ARRAY

    double run_width = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL);

    for (unsigned int j = 0; j < num_glyphs; j++) {
      double advance = (j + 1 < num_glyphs ? positions[j + 1].x : positions[0].x + run_width) - positions[j].x;

      hb_glyph_info_t *info = &buffer->info[buffer->len];
      hb_glyph_position_t *pos = &buffer->pos[buffer->len];

      info->codepoint = glyphs[j];
      info->cluster = string_indices[j];

      /* Currently, we do all x-positioning by setting the advance, we never use x-offset. */
      info->mask = advance;
      info->var1.u32 = 0;
      info->var2.u32 = positions[j].y;

      buffer->len++;
    }
  }

  buffer->clear_positions ();

  unsigned int count = buffer->len;
  for (unsigned int i = 0; i < count; ++i) {
    hb_glyph_info_t *info = &buffer->info[i];
    hb_glyph_position_t *pos = &buffer->pos[i];

    /* TODO vertical */
    pos->x_advance = info->mask;
    pos->x_offset = info->var1.u32;
    pos->y_offset = info->var2.u32;
  }

  /* Fix up clusters so that we never return out-of-order indices;
   * if core text has reordered glyphs, we'll merge them to the
   * beginning of the reordered cluster.
   *
   * This does *not* mean we'll form the same clusters as Uniscribe
   * or the native OT backend, only that the cluster indices will be
   * monotonic in the output buffer. */
  if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) {
    unsigned int prev_cluster = 0;
    for (unsigned int i = 0; i < count; i++) {
      unsigned int curr_cluster = buffer->info[i].cluster;
      if (curr_cluster < prev_cluster) {
        for (unsigned int j = i; j > 0; j--) {
          if (buffer->info[j - 1].cluster > curr_cluster)
            buffer->info[j - 1].cluster = curr_cluster;
          else
            break;
        }
      }
      prev_cluster = curr_cluster;
    }
  } else {
    unsigned int prev_cluster = (unsigned int)-1;
    for (unsigned int i = 0; i < count; i++) {
      unsigned int curr_cluster = buffer->info[i].cluster;
      if (curr_cluster > prev_cluster) {
        for (unsigned int j = i; j > 0; j--) {
          if (buffer->info[j - 1].cluster < curr_cluster)
            buffer->info[j - 1].cluster = curr_cluster;
          else
            break;
        }
      }
      prev_cluster = curr_cluster;
    }
  }

  return true;
}