third_party/harfbuzz-ng/src/hb-coretext.cc

   1 /*
   2  * Copyright © 2012  Mozilla Foundation.
   3  * Copyright © 2012  Google, Inc.
   4  *
   5  *  This is part of HarfBuzz, a text shaping library.
   6  *
   7  * Permission is hereby granted, without written agreement and without
   8  * license or royalty fees, to use, copy, modify, and distribute this
   9  * software and its documentation for any purpose, provided that the
  10  * above copyright notice and the following two paragraphs appear in
  11  * all copies of this software.
  12  *
  13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  17  * DAMAGE.
  18  *
  19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  24  *
  25  * Mozilla Author(s): Jonathan Kew
  26  * Google Author(s): Behdad Esfahbod
  27  */
  28
  29 #define HB_SHAPER coretext
  30 #include "hb-shaper-impl-private.hh"
  31
  32 #include "hb-coretext.h"
  33
  34
  35 #ifndef HB_DEBUG_CORETEXT
  36 #define HB_DEBUG_CORETEXT (HB_DEBUG+0)
  37 #endif
  38
  39
  40 HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face)
  41 HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font)
  42
  43
  44 /*
  45  * shaper face data
  46  */
  47
  48 struct hb_coretext_shaper_face_data_t {
  49   CGFontRef cg_font;
  50 };
  51
  52 static void
  53 release_data (void *info, const void *data, size_t size)
  54 {
  55   assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
  56           hb_blob_get_data ((hb_blob_t *) info, NULL) == data);
  57
  58   hb_blob_destroy ((hb_blob_t *) info);
  59 }
  60
  61 hb_coretext_shaper_face_data_t *
  62 _hb_coretext_shaper_face_data_create (hb_face_t *face)
  63 {
  64   hb_coretext_shaper_face_data_t *data = (hb_coretext_shaper_face_data_t *) calloc (1, sizeof (hb_coretext_shaper_face_data_t));
  65   if (unlikely (!data))
  66     return NULL;
  67
  68   hb_blob_t *blob = hb_face_reference_blob (face);
  69   unsigned int blob_length;
  70   const char *blob_data = hb_blob_get_data (blob, &blob_length);
  71   if (unlikely (!blob_length))
  72     DEBUG_MSG (CORETEXT, face, "Face has empty blob");
  73
  74   CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);
  75   data->cg_font = CGFontCreateWithDataProvider (provider);
  76   CGDataProviderRelease (provider);
  77
  78   if (unlikely (!data->cg_font)) {
  79     DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
  80     free (data);
  81     return NULL;
  82   }
  83
  84   return data;
  85 }
  86
  87 void
  88 _hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data)
  89 {
  90   CFRelease (data->cg_font);
  91   free (data);
  92 }
  93
  94 CGFontRef
  95 hb_coretext_face_get_cg_font (hb_face_t *face)
  96 {
  97   if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL;
  98   hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
  99   return face_data->cg_font;
 100 }
 101
 102
 103 /*
 104  * shaper font data
 105  */
 106
 107 struct hb_coretext_shaper_font_data_t {
 108   CTFontRef ct_font;
 109 };
 110
 111 hb_coretext_shaper_font_data_t *
 112 _hb_coretext_shaper_font_data_create (hb_font_t *font)
 113 {
 114   if (unlikely (!hb_coretext_shaper_face_data_ensure (font->face))) return NULL;
 115
 116   hb_coretext_shaper_font_data_t *data = (hb_coretext_shaper_font_data_t *) calloc (1, sizeof (hb_coretext_shaper_font_data_t));
 117   if (unlikely (!data))
 118     return NULL;
 119
 120   hb_face_t *face = font->face;
 121   hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
 122
 123   data->ct_font = CTFontCreateWithGraphicsFont (face_data->cg_font, font->y_scale, NULL, NULL);
 124   if (unlikely (!data->ct_font)) {
 125     DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed");
 126     free (data);
 127     return NULL;
 128   }
 129
 130   return data;
 131 }
 132
 133 void
 134 _hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data)
 135 {
 136   CFRelease (data->ct_font);
 137   free (data);
 138 }
 139
 140
 141 /*
 142  * shaper shape_plan data
 143  */
 144
 145 struct hb_coretext_shaper_shape_plan_data_t {};
 146
 147 hb_coretext_shaper_shape_plan_data_t *
 148 _hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,
 149                                              const hb_feature_t *user_features HB_UNUSED,
 150                                              unsigned int        num_user_features HB_UNUSED)
 151 {
 152   return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
 153 }
 154
 155 void
 156 _hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED)
 157 {
 158 }
 159
 160 CTFontRef
 161 hb_coretext_font_get_ct_font (hb_font_t *font)
 162 {
 163   if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return NULL;
 164   hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
 165   return font_data->ct_font;
 166 }
 167
 168
 169 /*
 170  * shaper
 171  */
 172
 173 hb_bool_t
 174 _hb_coretext_shape (hb_shape_plan_t    *shape_plan,
 175                     hb_font_t          *font,
 176                     hb_buffer_t        *buffer,
 177                     const hb_feature_t *features,
 178                     unsigned int        num_features)
 179 {
 180   hb_face_t *face = font->face;
 181   hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
 182   hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
 183
 184 #define FAIL(...) \
 185   HB_STMT_START { \
 186     DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \
 187     return false; \
 188   } HB_STMT_END;
 189
 190   unsigned int scratch_size;
 191   char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);
 192
 193 #define utf16_index() var1.u32
 194
 195   UniChar *pchars = (UniChar *) scratch;
 196   unsigned int chars_len = 0;
 197   for (unsigned int i = 0; i < buffer->len; i++) {
 198     hb_codepoint_t c = buffer->info[i].codepoint;
 199     buffer->info[i].utf16_index() = chars_len;
 200     if (likely (c < 0x10000))
 201       pchars[chars_len++] = c;
 202     else if (unlikely (c >= 0x110000))
 203       pchars[chars_len++] = 0xFFFD;
 204     else {
 205       pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10);
 206       pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
 207     }
 208   }
 209
 210 #undef utf16_index
 211
 212   CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (kCFAllocatorDefault,
 213                                                                pchars, chars_len,
 214                                                                kCFAllocatorNull);
 215
 216   CFDictionaryRef attrs = CFDictionaryCreate (kCFAllocatorDefault,
 217                                               (const void**) &kCTFontAttributeName,
 218                                               (const void**) &font_data->ct_font,
 219                                               1, /* count of attributes */
 220                                               &kCFTypeDictionaryKeyCallBacks,
 221                                               &kCFTypeDictionaryValueCallBacks);
 222
 223   /* TODO: support features */
 224
 225   CFAttributedStringRef attr_string = CFAttributedStringCreate (kCFAllocatorDefault, string_ref, attrs);
 226   CFRelease (string_ref);
 227   CFRelease (attrs);
 228
 229   CTLineRef line = CTLineCreateWithAttributedString (attr_string);
 230   CFRelease (attr_string);
 231
 232   CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
 233   unsigned int num_runs = CFArrayGetCount (glyph_runs);
 234
 235   bool success = true;
 236   buffer->len = 0;
 237
 238   const CFRange range_all = CFRangeMake (0, 0);
 239
 240   for (unsigned int i = 0; i < num_runs; i++) {
 241     CTRunRef run = (CTRunRef) CFArrayGetValueAtIndex (glyph_runs, i);
 242
 243     unsigned int num_glyphs = CTRunGetGlyphCount (run);
 244     if (num_glyphs == 0)
 245       continue;
 246
 247     buffer->ensure (buffer->len + num_glyphs);
 248
 249     /* Testing indicates that CTRunGetGlyphsPtr (almost?) always succeeds,
 250      * and so copying data to our own buffer with CTRunGetGlyphs will be
 251      * extremely rare. */
 252
 253     unsigned int scratch_size;
 254     char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);
 255
 256 #define ALLOCATE_ARRAY(Type, name, len) \
 257   Type *name = (Type *) scratch; \
 258   scratch += (len) * sizeof ((name)[0]); \
 259   scratch_size -= (len) * sizeof ((name)[0]);
 260
 261     const CGGlyph* glyphs = CTRunGetGlyphsPtr (run);
 262     if (!glyphs) {
 263       ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs);
 264       CTRunGetGlyphs (run, range_all, glyph_buf);
 265       glyphs = glyph_buf;
 266     }
 267
 268     const CGPoint* positions = CTRunGetPositionsPtr (run);
 269     if (!positions) {
 270       ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs);
 271       CTRunGetPositions (run, range_all, position_buf);
 272       positions = position_buf;
 273     }
 274
 275     const CFIndex* string_indices = CTRunGetStringIndicesPtr (run);
 276     if (!string_indices) {
 277       ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs);
 278       CTRunGetStringIndices (run, range_all, index_buf);
 279       string_indices = index_buf;
 280     }
 281
 282 #undef ALLOCATE_ARRAY
 283
 284     double run_width = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL);
 285
 286     for (unsigned int j = 0; j < num_glyphs; j++) {
 287       double advance = (j + 1 < num_glyphs ? positions[j + 1].x : positions[0].x + run_width) - positions[j].x;
 288
 289       hb_glyph_info_t *info = &buffer->info[buffer->len];
 290       hb_glyph_position_t *pos = &buffer->pos[buffer->len];
 291
 292       info->codepoint = glyphs[j];
 293       info->cluster = string_indices[j];
 294
 295       /* Currently, we do all x-positioning by setting the advance, we never use x-offset. */
 296       info->mask = advance;
 297       info->var1.u32 = 0;
 298       info->var2.u32 = positions[j].y;
 299
 300       buffer->len++;
 301     }
 302   }
 303
 304   buffer->clear_positions ();
 305
 306   unsigned int count = buffer->len;
 307   for (unsigned int i = 0; i < count; ++i) {
 308     hb_glyph_info_t *info = &buffer->info[i];
 309     hb_glyph_position_t *pos = &buffer->pos[i];
 310
 311     /* TODO vertical */
 312     pos->x_advance = info->mask;
 313     pos->x_offset = info->var1.u32;
 314     pos->y_offset = info->var2.u32;
 315   }
 316
 317   /* Fix up clusters so that we never return out-of-order indices;
 318    * if core text has reordered glyphs, we'll merge them to the
 319    * beginning of the reordered cluster.
 320    *
 321    * This does *not* mean we'll form the same clusters as Uniscribe
 322    * or the native OT backend, only that the cluster indices will be
 323    * monotonic in the output buffer. */
 324   if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) {
 325     unsigned int prev_cluster = 0;
 326     for (unsigned int i = 0; i < count; i++) {
 327       unsigned int curr_cluster = buffer->info[i].cluster;
 328       if (curr_cluster < prev_cluster) {
 329         for (unsigned int j = i; j > 0; j--) {
 330           if (buffer->info[j - 1].cluster > curr_cluster)
 331             buffer->info[j - 1].cluster = curr_cluster;
 332           else
 333             break;
 334         }
 335       }
 336       prev_cluster = curr_cluster;
 337     }
 338   } else {
 339     unsigned int prev_cluster = (unsigned int)-1;
 340     for (unsigned int i = 0; i < count; i++) {
 341       unsigned int curr_cluster = buffer->info[i].cluster;
 342       if (curr_cluster > prev_cluster) {
 343         for (unsigned int j = i; j > 0; j--) {
 344           if (buffer->info[j - 1].cluster < curr_cluster)
 345             buffer->info[j - 1].cluster = curr_cluster;
 346           else
 347             break;
 348         }
 349       }
 350       prev_cluster = curr_cluster;
 351     }
 352   }
 353
 354   return true;
 355 }