git.sesse.net Git - casparcg/blob - core/producer/text/utils/texture_font.cpp

   1 #include "../../../StdAfx.h"
   2
   3 #include "texture_atlas.h"
   4 #include "texture_font.h"
   5
   6 #include <map>
   7 #include <memory>
   8 #include <ft2build.h>
   9 #include FT_FREETYPE_H
  10 #include FT_GLYPH_H
  11
  12 namespace caspar { namespace core { namespace text {
  13
  14 struct freetype_exception : virtual caspar_exception
  15 {
  16         freetype_exception() {}
  17         explicit freetype_exception(const char* msg) : caspar_exception(msg) {}
  18 };
  19
  20 struct unicode_range
  21 {
  22         unicode_range() : first(0), last(0) {}
  23         unicode_range(int f, int l) : first(f), last(l) {}
  24
  25         int first;
  26         int last;
  27 };
  28
  29 unicode_range get_range(unicode_block block);
  30
  31
  32 struct texture_font::impl
  33 {
  34 private:
  35         struct glyph_info
  36         {
  37                 glyph_info(int w, int h, float l, float t, float r, float b) : width(w), height(h), left(l), top(t), right(r), bottom(b)
  38                 {}
  39
  40                 float left, top, right, bottom;
  41                 int width, height;
  42         };
  43
  44         std::shared_ptr<FT_LibraryRec_> lib_;
  45         std::shared_ptr<FT_FaceRec_>    face_;
  46         texture_atlas                                   atlas_;
  47         float                                                   size_;
  48         float                                                   tracking_;
  49         bool                                                    normalize_;
  50         std::map<int, glyph_info>               glyphs_;
  51
  52 public:
  53         impl(texture_atlas& atlas, const text_info& info, bool normalize_coordinates) : atlas_(atlas), size_(info.size), tracking_(info.size*info.tracking/1000.0f), normalize_(normalize_coordinates)
  54         {
  55                 FT_Library lib;
  56
  57                 if (FT_Init_FreeType(&lib))
  58                         throw freetype_exception("Failed to initialize freetype");
  59
  60                 lib_.reset(lib, [](FT_Library ptr) { FT_Done_FreeType(ptr); });
  61
  62                 FT_Face face;
  63
  64                 if (FT_New_Face(lib_.get(), u8(info.font_file).c_str(), 0, &face))
  65                         throw freetype_exception("Failed to load font");
  66
  67                 face_.reset(face, [](FT_Face ptr) { FT_Done_Face(ptr); });
  68
  69                 if (FT_Set_Char_Size(face_.get(), static_cast<FT_F26Dot6>(size_*64), 0, 72, 72))
  70                         throw freetype_exception("Failed to set font size");
  71         }
  72
  73         void set_tracking(int tracking)
  74         {
  75                 tracking_ = size_ * tracking / 1000.0f;
  76         }
  77
  78         int count_glyphs_in_range(unicode_block block)
  79         {
  80                 unicode_range range = get_range(block);
  81
  82                 //TODO: extract info from freetype
  83
  84                 //very pesimistic, assumes a glyph for each charcode
  85                 return range.last - range.first;
  86         }
  87
  88         void load_glyphs(unicode_block block, const color<float>& col)
  89         {
  90                 FT_Error err;
  91                 int flags = FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_NORMAL;
  92                 unicode_range range = get_range(block);
  93
  94                 for(int i = range.first; i <= range.last; ++i)
  95                 {
  96                         FT_UInt glyph_index = FT_Get_Char_Index(face_.get(), i);
  97                         if(!glyph_index)        //ignore codes that doesn't have a glyph for now. Might want to map these to a special glyph later.
  98                                 continue;
  99
 100                         err = FT_Load_Glyph(face_.get(), glyph_index, flags);
 101                         if(err) continue;       //igonore glyphs that fail to load
 102
 103                         const FT_Bitmap& bitmap = face_->glyph->bitmap; //shorthand notation
 104
 105                         auto region = atlas_.get_region(bitmap.width+1, bitmap.rows+1);
 106                         if(region.x < 0)
 107                         {
 108                                 //the glyph doesn't fit in the texture-atlas. ignore it for now.
 109                                 //we might want to restart with a bigger atlas in the future
 110                                 continue;
 111                         }
 112
 113                         atlas_.set_region(region.x, region.y, bitmap.width, bitmap.rows, bitmap.buffer, bitmap.pitch, col);
 114                         glyphs_.insert(std::pair<int, glyph_info>(i, glyph_info(bitmap.width, bitmap.rows,
 115                                                                                 region.x / (float)atlas_.width(),
 116                                                                                 region.y / (float)atlas_.height(),
 117                                                                                 (region.x + bitmap.width) / (float)atlas_.width(),
 118                                                                                 (region.y + bitmap.rows) / (float)atlas_.height())));
 119                 }
 120         }
 121
 122         std::vector<float> create_vertex_stream(const std::wstring& str, int x, int y, int parent_width, int parent_height, string_metrics* metrics)
 123         {
 124                 //TODO: detect glyphs that aren't in the atlas and load them (and maybe that entire unicode_block on the fly
 125
 126                 std::vector<float> result(16*str.length(), 0);
 127
 128                 bool use_kerning = (face_->face_flags & FT_FACE_FLAG_KERNING) == FT_FACE_FLAG_KERNING;
 129                 int index = 0;
 130                 FT_UInt previous = 0;
 131                 float pos_x = (float)x;
 132                 float pos_y = (float)y;
 133
 134                 int maxBearingY = 0;
 135                 int maxProtrudeUnderY = 0;
 136                 int maxHeight = 0;
 137
 138                 auto end = str.end();
 139                 for(auto it = str.begin(); it != end; ++it, ++index)
 140                 {
 141                         auto glyph_it = glyphs_.find(*it);
 142                         if(glyph_it != glyphs_.end())
 143                         {
 144                                 const glyph_info& coords = glyph_it->second;
 145
 146                                 FT_UInt glyph_index = FT_Get_Char_Index(face_.get(), (*it));
 147
 148                                 if(use_kerning && previous && glyph_index)
 149                                 {
 150                                         FT_Vector delta;
 151                                         FT_Get_Kerning(face_.get(), previous, glyph_index, FT_KERNING_DEFAULT, &delta);
 152
 153                                         pos_x += delta.x / 64.0f;
 154                                 }
 155
 156                                 FT_Load_Glyph(face_.get(), glyph_index, FT_LOAD_NO_BITMAP | FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_NORMAL);
 157
 158                                 float left = (pos_x + face_->glyph->metrics.horiBearingX/64.0f) / parent_width ;
 159                                 float right = ((pos_x + face_->glyph->metrics.horiBearingX/64.0f) + coords.width) / parent_width;
 160
 161                                 float top = (pos_y - face_->glyph->metrics.horiBearingY/64.0f) / parent_height;
 162                                 float bottom = ((pos_y - face_->glyph->metrics.horiBearingY/64.0f) + coords.height) / parent_height;
 163
 164                                 //vertex 1 top left
 165                                 result[index*16 + 0] = left;                    //vertex.x
 166                                 result[index*16 + 1] = top;                             //vertex.y
 167                                 result[index*16 + 2] = coords.left;             //texcoord.r
 168                                 result[index*16 + 3] = coords.top;              //texcoord.s
 169
 170                                 //vertex 2 top right
 171                                 result[index*16 + 4] = right;                   //vertex.x
 172                                 result[index*16 + 5] = top;                             //vertex.y
 173                                 result[index*16 + 6] = coords.right;    //texcoord.r
 174                                 result[index*16 + 7] = coords.top;              //texcoord.s
 175
 176                                 //vertex 3 bottom right
 177                                 result[index*16 + 8] = right;                   //vertex.x
 178                                 result[index*16 + 9] = bottom;                  //vertex.y
 179                                 result[index*16 + 10] = coords.right;   //texcoord.r
 180                                 result[index*16 + 11] = coords.bottom;  //texcoord.s
 181
 182                                 //vertex 4 bottom left
 183                                 result[index*16 + 12] = left;                   //vertex.x
 184                                 result[index*16 + 13] = bottom;                 //vertex.y
 185                                 result[index*16 + 14] = coords.left;    //texcoord.r
 186                                 result[index*16 + 15] = coords.bottom;  //texcoord.s
 187
 188                                 int bearingY = face_->glyph->metrics.horiBearingY >> 6;
 189
 190                                 if(bearingY > maxBearingY)
 191                                         maxBearingY = bearingY;
 192
 193                                 int protrudeUnderY = coords.height - bearingY;
 194
 195                                 if (protrudeUnderY > maxProtrudeUnderY)
 196                                         maxProtrudeUnderY = protrudeUnderY;
 197
 198                                 if (maxBearingY + maxProtrudeUnderY > maxHeight)
 199                                         maxHeight = maxBearingY + maxProtrudeUnderY;
 200
 201                                 pos_x += face_->glyph->advance.x / 64.0f;
 202                                 pos_x += tracking_;
 203                                 previous = glyph_index;
 204                         }
 205                         else
 206                         {
 207                                 //TODO: maybe we should try to load the glyph on the fly if it is missing.
 208                         }
 209                 }
 210
 211                 if(normalize_)
 212                 {
 213                         float ratio_x = parent_width/(pos_x - x);
 214                         float ratio_y = parent_height/(float)(maxHeight);
 215                         for(index = 0; index < result.size(); index += 4)
 216                         {
 217                                 result[index + 0] *= ratio_x;
 218                                 result[index + 1] *= ratio_y;
 219                         }
 220                 }
 221
 222                 if(metrics != nullptr)
 223                 {
 224                         metrics->width = (int)(pos_x - x + 0.5f);
 225                         metrics->bearingY = maxBearingY;
 226                         metrics->height = maxHeight;
 227                         metrics->protrudeUnderY = maxProtrudeUnderY;
 228                 }
 229                 return result;
 230         }
 231
 232         string_metrics measure_string(const std::wstring& str)
 233         {
 234                 string_metrics result;
 235
 236                 bool use_kerning = (face_->face_flags & FT_FACE_FLAG_KERNING) == FT_FACE_FLAG_KERNING;
 237                 int index = 0;
 238                 FT_UInt previous = 0;
 239                 float pos_x = 0;
 240 //              float pos_y = 0;
 241
 242                 auto end = str.end();
 243                 for(auto it = str.begin(); it != end; ++it, ++index)
 244                 {
 245                         auto glyph_it = glyphs_.find(*it);
 246                         if(glyph_it != glyphs_.end())
 247                         {
 248                                 const glyph_info& coords = glyph_it->second;
 249
 250                                 FT_UInt glyph_index = FT_Get_Char_Index(face_.get(), (*it));
 251
 252                                 if(use_kerning && previous && glyph_index)
 253                                 {
 254                                         FT_Vector delta;
 255                                         FT_Get_Kerning(face_.get(), previous, glyph_index, FT_KERNING_DEFAULT, &delta);
 256
 257                                         pos_x += delta.x / 64.0f;
 258                                 }
 259
 260                                 FT_Load_Glyph(face_.get(), glyph_index, FT_LOAD_NO_BITMAP | FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_NORMAL);
 261
 262                                 int bearingY = face_->glyph->metrics.horiBearingY >> 6;
 263                                 if(bearingY > result.bearingY)
 264                                         result.bearingY = bearingY;
 265
 266                                 int protrudeUnderY = coords.height - bearingY;
 267
 268                                 if (protrudeUnderY > result.protrudeUnderY)
 269                                         result.protrudeUnderY = protrudeUnderY;
 270
 271                                 if (result.bearingY + result.protrudeUnderY > result.height)
 272                                          result.height = result.bearingY + result.protrudeUnderY;
 273
 274                                 pos_x += face_->glyph->advance.x / 64.0f;
 275                                 previous = glyph_index;
 276                         }
 277                 }
 278
 279                 result.width = (int)(pos_x+.5f);
 280                 return result;
 281         }
 282 };
 283
 284 texture_font::texture_font(texture_atlas& atlas, const text_info& info, bool normalize_coordinates) : impl_(new impl(atlas, info, normalize_coordinates)) {}
 285 void texture_font::load_glyphs(unicode_block range, const color<float>& col) { impl_->load_glyphs(range, col); }
 286 void texture_font::set_tracking(int tracking) { impl_->set_tracking(tracking); }
 287 std::vector<float> texture_font::create_vertex_stream(const std::wstring& str, int x, int y, int parent_width, int parent_height, string_metrics* metrics) { return impl_->create_vertex_stream(str, x, y, parent_width, parent_height, metrics); }
 288 string_metrics texture_font::measure_string(const std::wstring& str) { return impl_->measure_string(str); }
 289
 290 unicode_range get_range(unicode_block block)
 291 {
 292         switch(block)
 293         {
 294                 case unicode_block::Basic_Latin: return unicode_range(0x0000, 0x007F);
 295                 case unicode_block::Latin_1_Supplement: return unicode_range(0x0080, 0x00FF);
 296                 case unicode_block::Latin_Extended_A: return            unicode_range(0x0100, 0x017F);
 297                 case unicode_block::Latin_Extended_B: return            unicode_range(0x0180, 0x024F);
 298                 case unicode_block::IPA_Extensions: return              unicode_range(0x0250, 0x02AF);
 299                 case unicode_block::Spacing_Modifier_Letters: return            unicode_range(0x02B0, 0x02FF);
 300                 case unicode_block::Combining_Diacritical_Marks: return         unicode_range(0x0300, 0x036F);
 301                 case unicode_block::Greek_and_Coptic: return            unicode_range(0x0370, 0x03FF);
 302                 case unicode_block::Cyrillic: return            unicode_range(0x0400, 0x04FF);
 303                 case unicode_block::Cyrillic_Supplement: return         unicode_range(0x0500, 0x052F);
 304                 case unicode_block::Armenian: return            unicode_range(0x0530, 0x058F);
 305                 case unicode_block::Hebrew: return              unicode_range(0x0590, 0x05FF);
 306                 case unicode_block::Arabic: return              unicode_range(0x0600, 0x06FF);
 307                 case unicode_block::Syriac: return              unicode_range(0x0700, 0x074F);
 308                 case unicode_block::Arabic_Supplement: return           unicode_range(0x0750, 0x077F);
 309                 case unicode_block::Thaana: return              unicode_range(0x0780, 0x07BF);
 310                 case unicode_block::NKo: return         unicode_range(0x07C0, 0x07FF);
 311                 case unicode_block::Samaritan: return           unicode_range(0x0800, 0x083F);
 312                 case unicode_block::Mandaic: return             unicode_range(0x0840, 0x085F);
 313                 case unicode_block::Arabic_Extended_A: return           unicode_range(0x08A0, 0x08FF);
 314                 case unicode_block::Devanagari: return          unicode_range(0x0900, 0x097F);
 315                 case unicode_block::Bengali: return             unicode_range(0x0980, 0x09FF);
 316                 case unicode_block::Gurmukhi: return            unicode_range(0x0A00, 0x0A7F);
 317                 case unicode_block::Gujarati: return            unicode_range(0x0A80, 0x0AFF);
 318                 case unicode_block::Oriya: return               unicode_range(0x0B00, 0x0B7F);
 319                 case unicode_block::Tamil: return               unicode_range(0x0B80, 0x0BFF);
 320                 case unicode_block::Telugu: return              unicode_range(0x0C00, 0x0C7F);
 321                 case unicode_block::Kannada: return             unicode_range(0x0C80, 0x0CFF);
 322                 case unicode_block::Malayalam: return           unicode_range(0x0D00, 0x0D7F);
 323                 case unicode_block::Sinhala: return             unicode_range(0x0D80, 0x0DFF);
 324                 case unicode_block::Thai: return                unicode_range(0x0E00, 0x0E7F);
 325                 case unicode_block::Lao: return         unicode_range(0x0E80, 0x0EFF);
 326                 case unicode_block::Tibetan: return             unicode_range(0x0F00, 0x0FFF);
 327                 case unicode_block::Myanmar: return             unicode_range(0x1000, 0x109F);
 328                 case unicode_block::Georgian: return            unicode_range(0x10A0, 0x10FF);
 329                 case unicode_block::Hangul_Jamo: return         unicode_range(0x1100, 0x11FF);
 330                 case unicode_block::Ethiopic: return            unicode_range(0x1200, 0x137F);
 331                 case unicode_block::Ethiopic_Supplement: return         unicode_range(0x1380, 0x139F);
 332                 case unicode_block::Cherokee: return            unicode_range(0x13A0, 0x13FF);
 333                 case unicode_block::Unified_Canadian_Aboriginal_Syllabics: return               unicode_range(0x1400, 0x167F);
 334                 case unicode_block::Ogham: return               unicode_range(0x1680, 0x169F);
 335                 case unicode_block::Runic: return               unicode_range(0x16A0, 0x16FF);
 336                 case unicode_block::Tagalog: return             unicode_range(0x1700, 0x171F);
 337                 case unicode_block::Hanunoo: return             unicode_range(0x1720, 0x173F);
 338                 case unicode_block::Buhid: return               unicode_range(0x1740, 0x175F);
 339                 case unicode_block::Tagbanwa: return            unicode_range(0x1760, 0x177F);
 340                 case unicode_block::Khmer: return               unicode_range(0x1780, 0x17FF);
 341                 case unicode_block::Mongolian: return           unicode_range(0x1800, 0x18AF);
 342                 case unicode_block::Unified_Canadian_Aboriginal_Syllabics_Extended: return              unicode_range(0x18B0, 0x18FF);
 343                 case unicode_block::Limbu: return               unicode_range(0x1900, 0x194F);
 344                 case unicode_block::Tai_Le: return              unicode_range(0x1950, 0x197F);
 345                 case unicode_block::New_Tai_Lue: return         unicode_range(0x1980, 0x19DF);
 346                 case unicode_block::Khmer_Symbols: return               unicode_range(0x19E0, 0x19FF);
 347                 case unicode_block::Buginese: return            unicode_range(0x1A00, 0x1A1F);
 348                 case unicode_block::Tai_Tham: return            unicode_range(0x1A20, 0x1AAF);
 349                 case unicode_block::Balinese: return            unicode_range(0x1B00, 0x1B7F);
 350                 case unicode_block::Sundanese: return           unicode_range(0x1B80, 0x1BBF);
 351                 case unicode_block::Batak: return               unicode_range(0x1BC0, 0x1BFF);
 352                 case unicode_block::Lepcha: return              unicode_range(0x1C00, 0x1C4F);
 353                 case unicode_block::Ol_Chiki: return            unicode_range(0x1C50, 0x1C7F);
 354                 case unicode_block::Sundanese_Supplement: return                unicode_range(0x1CC0, 0x1CCF);
 355                 case unicode_block::Vedic_Extensions: return            unicode_range(0x1CD0, 0x1CFF);
 356                 case unicode_block::Phonetic_Extensions: return         unicode_range(0x1D00, 0x1D7F);
 357                 case unicode_block::Phonetic_Extensions_Supplement: return              unicode_range(0x1D80, 0x1DBF);
 358                 case unicode_block::Combining_Diacritical_Marks_Supplement: return              unicode_range(0x1DC0, 0x1DFF);
 359                 case unicode_block::Latin_Extended_Additional: return           unicode_range(0x1E00, 0x1EFF);
 360                 case unicode_block::Greek_Extended: return              unicode_range(0x1F00, 0x1FFF);
 361                 case unicode_block::General_Punctuation: return         unicode_range(0x2000, 0x206F);
 362                 case unicode_block::Superscripts_and_Subscripts: return         unicode_range(0x2070, 0x209F);
 363                 case unicode_block::Currency_Symbols: return            unicode_range(0x20A0, 0x20CF);
 364                 case unicode_block::Combining_Diacritical_Marks_for_Symbols: return             unicode_range(0x20D0, 0x20FF);
 365                 case unicode_block::Letterlike_Symbols: return          unicode_range(0x2100, 0x214F);
 366                 case unicode_block::Number_Forms: return                unicode_range(0x2150, 0x218F);
 367                 case unicode_block::Arrows: return              unicode_range(0x2190, 0x21FF);
 368                 case unicode_block::Mathematical_Operators: return              unicode_range(0x2200, 0x22FF);
 369                 case unicode_block::Miscellaneous_Technical: return             unicode_range(0x2300, 0x23FF);
 370                 case unicode_block::Control_Pictures: return            unicode_range(0x2400, 0x243F);
 371                 case unicode_block::Optical_Character_Recognition: return               unicode_range(0x2440, 0x245F);
 372                 case unicode_block::Enclosed_Alphanumerics: return              unicode_range(0x2460, 0x24FF);
 373                 case unicode_block::Box_Drawing: return         unicode_range(0x2500, 0x257F);
 374                 case unicode_block::Block_Elements: return              unicode_range(0x2580, 0x259F);
 375                 case unicode_block::Geometric_Shapes: return            unicode_range(0x25A0, 0x25FF);
 376                 case unicode_block::Miscellaneous_Symbols: return               unicode_range(0x2600, 0x26FF);
 377                 case unicode_block::Dingbats: return            unicode_range(0x2700, 0x27BF);
 378                 case unicode_block::Miscellaneous_Mathematical_Symbols_A: return                unicode_range(0x27C0, 0x27EF);
 379                 case unicode_block::Supplemental_Arrows_A: return               unicode_range(0x27F0, 0x27FF);
 380                 case unicode_block::Braille_Patterns: return            unicode_range(0x2800, 0x28FF);
 381                 case unicode_block::Supplemental_Arrows_B: return               unicode_range(0x2900, 0x297F);
 382                 case unicode_block::Miscellaneous_Mathematical_Symbols_B: return                unicode_range(0x2980, 0x29FF);
 383                 case unicode_block::Supplemental_Mathematical_Operators: return         unicode_range(0x2A00, 0x2AFF);
 384                 case unicode_block::Miscellaneous_Symbols_and_Arrows: return            unicode_range(0x2B00, 0x2BFF);
 385                 case unicode_block::Glagolitic: return          unicode_range(0x2C00, 0x2C5F);
 386                 case unicode_block::Latin_Extended_C: return            unicode_range(0x2C60, 0x2C7F);
 387                 case unicode_block::Coptic: return              unicode_range(0x2C80, 0x2CFF);
 388                 case unicode_block::Georgian_Supplement: return         unicode_range(0x2D00, 0x2D2F);
 389                 case unicode_block::Tifinagh: return            unicode_range(0x2D30, 0x2D7F);
 390                 case unicode_block::Ethiopic_Extended: return           unicode_range(0x2D80, 0x2DDF);
 391                 case unicode_block::Cyrillic_Extended_A: return         unicode_range(0x2DE0, 0x2DFF);
 392                 case unicode_block::Supplemental_Punctuation: return            unicode_range(0x2E00, 0x2E7F);
 393                 case unicode_block::CJK_Radicals_Supplement: return             unicode_range(0x2E80, 0x2EFF);
 394                 case unicode_block::Kangxi_Radicals: return             unicode_range(0x2F00, 0x2FDF);
 395                 case unicode_block::Ideographic_Description_Characters: return          unicode_range(0x2FF0, 0x2FFF);
 396                 case unicode_block::CJK_Symbols_and_Punctuation: return         unicode_range(0x3000, 0x303F);
 397                 case unicode_block::Hiragana: return            unicode_range(0x3040, 0x309F);
 398                 case unicode_block::Katakana: return            unicode_range(0x30A0, 0x30FF);
 399                 case unicode_block::Bopomofo: return            unicode_range(0x3100, 0x312F);
 400                 case unicode_block::Hangul_Compatibility_Jamo: return           unicode_range(0x3130, 0x318F);
 401                 case unicode_block::Kanbun: return              unicode_range(0x3190, 0x319F);
 402                 case unicode_block::Bopomofo_Extended: return           unicode_range(0x31A0, 0x31BF);
 403                 case unicode_block::CJK_Strokes: return         unicode_range(0x31C0, 0x31EF);
 404                 case unicode_block::Katakana_Phonetic_Extensions: return                unicode_range(0x31F0, 0x31FF);
 405                 case unicode_block::Enclosed_CJK_Letters_and_Months: return             unicode_range(0x3200, 0x32FF);
 406                 case unicode_block::CJK_Compatibility: return           unicode_range(0x3300, 0x33FF);
 407                 case unicode_block::CJK_Unified_Ideographs_Extension_A: return          unicode_range(0x3400, 0x4DBF);
 408                 case unicode_block::Yijing_Hexagram_Symbols: return             unicode_range(0x4DC0, 0x4DFF);
 409                 case unicode_block::CJK_Unified_Ideographs: return              unicode_range(0x4E00, 0x9FFF);
 410                 case unicode_block::Yi_Syllables: return                unicode_range(0xA000, 0xA48F);
 411                 case unicode_block::Yi_Radicals: return         unicode_range(0xA490, 0xA4CF);
 412                 case unicode_block::Lisu: return                unicode_range(0xA4D0, 0xA4FF);
 413                 case unicode_block::Vai: return         unicode_range(0xA500, 0xA63F);
 414                 case unicode_block::Cyrillic_Extended_B: return         unicode_range(0xA640, 0xA69F);
 415                 case unicode_block::Bamum: return               unicode_range(0xA6A0, 0xA6FF);
 416                 case unicode_block::Modifier_Tone_Letters: return               unicode_range(0xA700, 0xA71F);
 417                 case unicode_block::Latin_Extended_D: return            unicode_range(0xA720, 0xA7FF);
 418                 case unicode_block::Syloti_Nagri: return                unicode_range(0xA800, 0xA82F);
 419                 case unicode_block::Common_Indic_Number_Forms: return           unicode_range(0xA830, 0xA83F);
 420                 case unicode_block::Phags_pa: return            unicode_range(0xA840, 0xA87F);
 421                 case unicode_block::Saurashtra: return          unicode_range(0xA880, 0xA8DF);
 422                 case unicode_block::Devanagari_Extended: return         unicode_range(0xA8E0, 0xA8FF);
 423                 case unicode_block::Kayah_Li: return            unicode_range(0xA900, 0xA92F);
 424                 case unicode_block::Rejang: return              unicode_range(0xA930, 0xA95F);
 425                 case unicode_block::Hangul_Jamo_Extended_A: return              unicode_range(0xA960, 0xA97F);
 426                 case unicode_block::Javanese: return            unicode_range(0xA980, 0xA9DF);
 427                 case unicode_block::Cham: return                unicode_range(0xAA00, 0xAA5F);
 428                 case unicode_block::Myanmar_Extended_A: return          unicode_range(0xAA60, 0xAA7F);
 429                 case unicode_block::Tai_Viet: return            unicode_range(0xAA80, 0xAADF);
 430                 case unicode_block::Meetei_Mayek_Extensions: return             unicode_range(0xAAE0, 0xAAFF);
 431                 case unicode_block::Ethiopic_Extended_A: return         unicode_range(0xAB00, 0xAB2F);
 432                 case unicode_block::Meetei_Mayek: return                unicode_range(0xABC0, 0xABFF);
 433                 case unicode_block::Hangul_Syllables: return            unicode_range(0xAC00, 0xD7AF);
 434                 case unicode_block::Hangul_Jamo_Extended_B: return              unicode_range(0xD7B0, 0xD7FF);
 435                 case unicode_block::High_Surrogates: return             unicode_range(0xD800, 0xDB7F);
 436                 case unicode_block::High_Private_Use_Surrogates: return         unicode_range(0xDB80, 0xDBFF);
 437                 case unicode_block::Low_Surrogates: return              unicode_range(0xDC00, 0xDFFF);
 438                 case unicode_block::Private_Use_Area: return            unicode_range(0xE000, 0xF8FF);
 439                 case unicode_block::CJK_Compatibility_Ideographs: return                unicode_range(0xF900, 0xFAFF);
 440                 case unicode_block::Alphabetic_Presentation_Forms: return               unicode_range(0xFB00, 0xFB4F);
 441                 case unicode_block::Arabic_Presentation_Forms_A: return         unicode_range(0xFB50, 0xFDFF);
 442                 case unicode_block::Variation_Selectors: return         unicode_range(0xFE00, 0xFE0F);
 443                 case unicode_block::Vertical_Forms: return              unicode_range(0xFE10, 0xFE1F);
 444                 case unicode_block::Combining_Half_Marks: return                unicode_range(0xFE20, 0xFE2F);
 445                 case unicode_block::CJK_Compatibility_Forms: return             unicode_range(0xFE30, 0xFE4F);
 446                 case unicode_block::Small_Form_Variants: return         unicode_range(0xFE50, 0xFE6F);
 447                 case unicode_block::Arabic_Presentation_Forms_B: return         unicode_range(0xFE70, 0xFEFF);
 448                 case unicode_block::Halfwidth_and_Fullwidth_Forms: return               unicode_range(0xFF00, 0xFFEF);
 449                 case unicode_block::Specials: return            unicode_range(0xFFF0, 0xFFFF);
 450                 case unicode_block::Linear_B_Syllabary: return          unicode_range(0x10000, 0x1007F);
 451                 case unicode_block::Linear_B_Ideograms: return          unicode_range(0x10080, 0x100FF);
 452                 case unicode_block::Aegean_Numbers: return              unicode_range(0x10100, 0x1013F);
 453                 case unicode_block::Ancient_Greek_Numbers: return               unicode_range(0x10140, 0x1018F);
 454                 case unicode_block::Ancient_Symbols: return             unicode_range(0x10190, 0x101CF);
 455                 case unicode_block::Phaistos_Disc: return               unicode_range(0x101D0, 0x101FF);
 456                 case unicode_block::Lycian: return              unicode_range(0x10280, 0x1029F);
 457                 case unicode_block::Carian: return              unicode_range(0x102A0, 0x102DF);
 458                 case unicode_block::Old_Italic: return          unicode_range(0x10300, 0x1032F);
 459                 case unicode_block::Gothic: return              unicode_range(0x10330, 0x1034F);
 460                 case unicode_block::Ugaritic: return            unicode_range(0x10380, 0x1039F);
 461                 case unicode_block::Old_Persian: return         unicode_range(0x103A0, 0x103DF);
 462                 case unicode_block::Deseret: return             unicode_range(0x10400, 0x1044F);
 463                 case unicode_block::Shavian: return             unicode_range(0x10450, 0x1047F);
 464                 case unicode_block::Osmanya: return             unicode_range(0x10480, 0x104AF);
 465                 case unicode_block::Cypriot_Syllabary: return           unicode_range(0x10800, 0x1083F);
 466                 case unicode_block::Imperial_Aramaic: return            unicode_range(0x10840, 0x1085F);
 467                 case unicode_block::Phoenician: return          unicode_range(0x10900, 0x1091F);
 468                 case unicode_block::Lydian: return              unicode_range(0x10920, 0x1093F);
 469                 case unicode_block::Meroitic_Hieroglyphs: return                unicode_range(0x10980, 0x1099F);
 470                 case unicode_block::Meroitic_Cursive: return            unicode_range(0x109A0, 0x109FF);
 471                 case unicode_block::Kharoshthi: return          unicode_range(0x10A00, 0x10A5F);
 472                 case unicode_block::Old_South_Arabian: return           unicode_range(0x10A60, 0x10A7F);
 473                 case unicode_block::Avestan: return             unicode_range(0x10B00, 0x10B3F);
 474                 case unicode_block::Inscriptional_Parthian: return              unicode_range(0x10B40, 0x10B5F);
 475                 case unicode_block::Inscriptional_Pahlavi: return               unicode_range(0x10B60, 0x10B7F);
 476                 case unicode_block::Old_Turkic: return          unicode_range(0x10C00, 0x10C4F);
 477                 case unicode_block::Rumi_Numeral_Symbols: return                unicode_range(0x10E60, 0x10E7F);
 478                 case unicode_block::Brahmi: return              unicode_range(0x11000, 0x1107F);
 479                 case unicode_block::Kaithi: return              unicode_range(0x11080, 0x110CF);
 480                 case unicode_block::Sora_Sompeng: return                unicode_range(0x110D0, 0x110FF);
 481                 case unicode_block::Chakma: return              unicode_range(0x11100, 0x1114F);
 482                 case unicode_block::Sharada: return             unicode_range(0x11180, 0x111DF);
 483                 case unicode_block::Takri: return               unicode_range(0x11680, 0x116CF);
 484                 case unicode_block::Cuneiform: return           unicode_range(0x12000, 0x123FF);
 485                 case unicode_block::Cuneiform_Numbers_and_Punctuation: return           unicode_range(0x12400, 0x1247F);
 486                 case unicode_block::Egyptian_Hieroglyphs: return                unicode_range(0x13000, 0x1342F);
 487                 case unicode_block::Bamum_Supplement: return            unicode_range(0x16800, 0x16A3F);
 488                 case unicode_block::Miao: return                unicode_range(0x16F00, 0x16F9F);
 489                 case unicode_block::Kana_Supplement: return             unicode_range(0x1B000, 0x1B0FF);
 490                 case unicode_block::Byzantine_Musical_Symbols: return           unicode_range(0x1D000, 0x1D0FF);
 491                 case unicode_block::Musical_Symbols: return             unicode_range(0x1D100, 0x1D1FF);
 492                 case unicode_block::Ancient_Greek_Musical_Notation: return              unicode_range(0x1D200, 0x1D24F);
 493                 case unicode_block::Tai_Xuan_Jing_Symbols: return               unicode_range(0x1D300, 0x1D35F);
 494                 case unicode_block::Counting_Rod_Numerals: return               unicode_range(0x1D360, 0x1D37F);
 495                 case unicode_block::Mathematical_Alphanumeric_Symbols: return           unicode_range(0x1D400, 0x1D7FF);
 496                 case unicode_block::Arabic_Mathematical_Alphabetic_Symbols: return              unicode_range(0x1EE00, 0x1EEFF);
 497                 case unicode_block::Mahjong_Tiles: return               unicode_range(0x1F000, 0x1F02F);
 498                 case unicode_block::Domino_Tiles: return                unicode_range(0x1F030, 0x1F09F);
 499                 case unicode_block::Playing_Cards: return               unicode_range(0x1F0A0, 0x1F0FF);
 500                 case unicode_block::Enclosed_Alphanumeric_Supplement: return            unicode_range(0x1F100, 0x1F1FF);
 501                 case unicode_block::Enclosed_Ideographic_Supplement: return             unicode_range(0x1F200, 0x1F2FF);
 502                 case unicode_block::Miscellaneous_Symbols_And_Pictographs: return               unicode_range(0x1F300, 0x1F5FF);
 503                 case unicode_block::Emoticons: return           unicode_range(0x1F600, 0x1F64F);
 504                 case unicode_block::Transport_And_Map_Symbols: return           unicode_range(0x1F680, 0x1F6FF);
 505                 case unicode_block::Alchemical_Symbols: return          unicode_range(0x1F700, 0x1F77F);
 506                 case unicode_block::CJK_Unified_Ideographs_Extension_B: return          unicode_range(0x20000, 0x2A6DF);
 507                 case unicode_block::CJK_Unified_Ideographs_Extension_C: return          unicode_range(0x2A700, 0x2B73F);
 508                 case unicode_block::CJK_Unified_Ideographs_Extension_D: return          unicode_range(0x2B740, 0x2B81F);
 509                 case unicode_block::CJK_Compatibility_Ideographs_Supplement: return             unicode_range(0x2F800, 0x2FA1F);
 510                 case unicode_block::Tags: return                unicode_range(0xE0000, 0xE007F);
 511                 case unicode_block::Variation_Selectors_Supplement: return              unicode_range(0xE0100, 0xE01EF);
 512                 case unicode_block::Supplementary_Private_Use_Area_A: return            unicode_range(0xF0000, 0xFFFFF);
 513                 case unicode_block::Supplementary_Private_Use_Area_B: return            unicode_range(0x100000, 0x10FFFF);
 514         }
 515         return unicode_range(0,0);
 516 }
 517
 518 }}}