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 <ft2build.h>
   8 #include FT_FREETYPE_H
   9 #include FT_GLYPH_H
  10
  11 namespace caspar { namespace core { namespace text {
  12
  13 struct freetype_exception : virtual caspar_exception
  14 {
  15         freetype_exception() {}
  16         explicit freetype_exception(const char* msg) : caspar_exception(msg) {}
  17 };
  18
  19 struct unicode_range
  20 {
  21         int first;
  22         int last;
  23 };
  24
  25 unicode_range get_range(unicode_block block);
  26
  27
  28 struct texture_font::impl
  29 {
  30 private:
  31         struct glyph_info
  32         {
  33                 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)
  34                 {}
  35
  36                 float left, top, right, bottom;
  37                 int width, height;
  38         };
  39
  40         FT_Library              lib_;
  41         FT_Face                 face_;
  42         texture_atlas   atlas_;
  43         float                   size_;
  44         std::map<int, glyph_info> glyphs_;
  45
  46 public:
  47         impl::impl(texture_atlas& atlas, const std::wstring& filename, float size) : lib_(nullptr), face_(nullptr), atlas_(atlas), size_(size)
  48         {
  49                 try
  50                 {
  51                         FT_Error err;
  52                         err = FT_Init_FreeType(&lib_);
  53                         if(err) throw freetype_exception("Failed to initialize freetype");
  54
  55                         err = FT_New_Face(lib_, u8(filename).c_str(), 0, &face_);
  56                         if(err) throw freetype_exception("Failed to load font");
  57
  58                         err = FT_Set_Char_Size(face_, (FT_F26Dot6)(size*64), 0, 72, 72);
  59                         if(err) throw freetype_exception("Failed to set font size");
  60                 }
  61                 catch(std::exception& ex)
  62                 {
  63                         if(face_ != nullptr)
  64                                 FT_Done_Face(face_);
  65                         if(lib_ != nullptr)
  66                                 FT_Done_FreeType(lib_);
  67
  68                         throw ex;
  69                 }
  70         }
  71
  72         ~impl()
  73         {
  74                 if(face_ != nullptr)
  75                         FT_Done_Face(face_);
  76                 if(lib_ != nullptr)
  77                         FT_Done_FreeType(lib_);
  78         }
  79
  80         int count_glyphs_in_range(unicode_block block)
  81         {
  82                 unicode_range range = get_range(block);
  83
  84                 //TODO: extract info from freetype
  85
  86                 //very pesimistic, assumes a glyph for each charcode
  87                 return range.last - range.first;
  88         }
  89
  90         void impl::load_glyphs(unicode_block block, const color<float>& col)
  91         {
  92                 FT_Error err;
  93                 int flags = FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_NORMAL;
  94                 unicode_range range = get_range(block);
  95
  96                 for(int i = range.first; i <= range.last; ++i)
  97                 {
  98                         FT_UInt glyph_index = FT_Get_Char_Index(face_, i);
  99                         if(!glyph_index)        //ignore codes that doesn't have a glyph for now. Might want to map these to a special glyph later.
 100                                 continue;
 101
 102                         err = FT_Load_Glyph(face_, glyph_index, flags);
 103                         if(err) continue;       //igonore glyphs that fail to load
 104
 105                         const FT_Bitmap& bitmap = face_->glyph->bitmap; //shorthand notation
 106
 107                         auto region = atlas_.get_region(bitmap.width+1, bitmap.rows+1);
 108                         if(region.x < 0)
 109                         {
 110                                 //the glyph doesn't fit in the texture-atlas. ignore it for now.
 111                                 //we might want to restart with a bigger atlas in the future
 112                                 continue;
 113                         }
 114
 115                         atlas_.set_region(region.x, region.y, bitmap.width, bitmap.rows, bitmap.buffer, bitmap.pitch, col);
 116                         glyphs_.insert(std::pair<int, glyph_info>(i, glyph_info(bitmap.width, bitmap.rows,
 117                                                                                 region.x / (float)atlas_.width(),
 118                                                                                 region.y / (float)atlas_.height(),
 119                                                                                 (region.x + bitmap.width) / (float)atlas_.width(),
 120                                                                                 (region.y + bitmap.rows) / (float)atlas_.height())));
 121                 }
 122         }
 123
 124         std::vector<float> create_vertex_stream(const std::wstring& str, int x, int y, int parent_width, int parent_height)
 125         {
 126                 //TODO: detect glyphs that aren't in the atlas and load them (and maybe that entire unicode_block on the fly
 127
 128                 std::vector<float> result(16*str.length(), 0);
 129
 130                 bool use_kerning = (face_->face_flags & FT_FACE_FLAG_KERNING) == FT_FACE_FLAG_KERNING;
 131                 int index = 0;
 132                 FT_UInt previous = 0;
 133                 float pos_x = (float)x;
 134                 float pos_y = (float)y;
 135
 136                 auto end = str.end();
 137                 for(auto it = str.begin(); it != end; ++it, ++index)
 138                 {
 139                         auto glyph_it = glyphs_.find(*it);
 140                         if(glyph_it != glyphs_.end())
 141                         {
 142                                 const glyph_info& coords = glyph_it->second;
 143
 144                                 FT_UInt glyph_index = FT_Get_Char_Index(face_, (*it));
 145
 146                                 if(use_kerning && previous && glyph_index)
 147                                 {
 148                                         FT_Vector delta;
 149                                         FT_Get_Kerning(face_, previous, glyph_index, FT_KERNING_DEFAULT, &delta);
 150
 151                                         pos_x += delta.x / 64.0f;
 152                                 }
 153
 154                                 FT_Load_Glyph(face_, glyph_index, FT_LOAD_NO_BITMAP | FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_NORMAL);
 155
 156                                 float left = (pos_x + face_->glyph->metrics.horiBearingX/64.0f) / parent_width ;
 157                                 float right = ((pos_x + face_->glyph->metrics.horiBearingX/64.0f) + coords.width) / parent_width;
 158
 159                                 float top = (pos_y - face_->glyph->metrics.horiBearingY/64.0f) / parent_height;
 160                                 float bottom = ((pos_y - face_->glyph->metrics.horiBearingY/64.0f) + coords.height) / parent_height;
 161
 162                                 //vertex 1 top left
 163                                 result[index*16 + 0] = left;                    //vertex.x
 164                                 result[index*16 + 1] = top;                             //vertex.y
 165                                 result[index*16 + 2] = coords.left;             //texcoord.r
 166                                 result[index*16 + 3] = coords.top;              //texcoord.s
 167
 168                                 //vertex 2 top right
 169                                 result[index*16 + 4] = right;                   //vertex.x
 170                                 result[index*16 + 5] = top;                             //vertex.y
 171                                 result[index*16 + 6] = coords.right;    //texcoord.r
 172                                 result[index*16 + 7] = coords.top;              //texcoord.s
 173
 174                                 //vertex 3 bottom right
 175                                 result[index*16 + 8] = right;                   //vertex.x
 176                                 result[index*16 + 9] = bottom;                  //vertex.y
 177                                 result[index*16 + 10] = coords.right;   //texcoord.r
 178                                 result[index*16 + 11] = coords.bottom;  //texcoord.s
 179
 180                                 //vertex 4 bottom left
 181                                 result[index*16 + 12] = left;                   //vertex.x
 182                                 result[index*16 + 13] = bottom;                 //vertex.y
 183                                 result[index*16 + 14] = coords.left;    //texcoord.r
 184                                 result[index*16 + 15] = coords.bottom;  //texcoord.s
 185
 186                                 pos_x += face_->glyph->advance.x / 64.0f;
 187                                 previous = glyph_index;
 188                         }
 189                 }
 190                 return result;
 191         }
 192
 193         string_metrics measure_string(const std::wstring& str)
 194         {
 195                 string_metrics result;
 196
 197                 bool use_kerning = (face_->face_flags & FT_FACE_FLAG_KERNING) == FT_FACE_FLAG_KERNING;
 198                 int index = 0;
 199                 FT_UInt previous = 0;
 200                 float pos_x = 0;
 201 //              float pos_y = 0;
 202
 203                 auto end = str.end();
 204                 for(auto it = str.begin(); it != end; ++it, ++index)
 205                 {
 206                         auto glyph_it = glyphs_.find(*it);
 207                         if(glyph_it != glyphs_.end())
 208                         {
 209                                 const glyph_info& coords = glyph_it->second;
 210
 211                                 FT_UInt glyph_index = FT_Get_Char_Index(face_, (*it));
 212
 213                                 if(use_kerning && previous && glyph_index)
 214                                 {
 215                                         FT_Vector delta;
 216                                         FT_Get_Kerning(face_, previous, glyph_index, FT_KERNING_DEFAULT, &delta);
 217
 218                                         pos_x += delta.x / 64.0f;
 219                                 }
 220
 221                                 FT_Load_Glyph(face_, glyph_index, FT_LOAD_NO_BITMAP | FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_NORMAL);
 222
 223                                 int bearingY = face_->glyph->metrics.horiBearingY >> 6;
 224                                 if(bearingY > result.bearingY)
 225                                         result.bearingY = bearingY;
 226
 227                                 if(coords.height > result.height)
 228                                         result.height = coords.height;
 229
 230                                 pos_x += face_->glyph->advance.x / 64.0f;
 231                                 previous = glyph_index;
 232                         }
 233                 }
 234
 235                 result.width = (int)(pos_x+.5f);
 236                 return result;
 237         }
 238 };
 239
 240 texture_font::texture_font(texture_atlas& atlas, const std::wstring& filename, float size) : impl_(new impl(atlas, filename, size)) {}
 241 void texture_font::load_glyphs(unicode_block range, const color<float>& col) { impl_->load_glyphs(range, col); }
 242 std::vector<float> texture_font::create_vertex_stream(const std::wstring& str, int x, int y, int parent_width, int parent_height) { return impl_->create_vertex_stream(str, x, y, parent_width, parent_height); }
 243 string_metrics texture_font::measure_string(const std::wstring& str) { return impl_->measure_string(str); }
 244
 245 unicode_range get_range(unicode_block block)
 246 {
 247         //TODO: implement
 248         unicode_range range = {0x0000, 0x007F};
 249         return range;
 250 }
 251
 252 }}}
 253
 254 //unicode blocks
 255 /*
 256                 range(0x0000, 0x007F);
 257                 range(0x0080, 0x00FF);
 258                 range(0x0100, 0x017F);
 259                 range(0x0180, 0x024F);
 260                 range(0x0250, 0x02AF);
 261                 range(0x02B0, 0x02FF);
 262                 range(0x0300, 0x036F);
 263                 range(0x0370, 0x03FF);
 264                 range(0x0400, 0x04FF);
 265                 range(0x0500, 0x052F);
 266                 range(0x0530, 0x058F);
 267                 range(0x0590, 0x05FF);
 268                 range(0x0600, 0x06FF);
 269                 range(0x0700, 0x074F);
 270                 range(0x0750, 0x077F);
 271                 range(0x0780, 0x07BF);
 272                 range(0x07C0, 0x07FF);
 273                 range(0x0800, 0x083F);
 274                 range(0x0840, 0x085F);
 275                 range(0x08A0, 0x08FF);
 276                 range(0x0900, 0x097F);
 277                 range(0x0980, 0x09FF);
 278                 range(0x0A00, 0x0A7F);
 279                 range(0x0A80, 0x0AFF);
 280                 range(0x0B00, 0x0B7F);
 281                 range(0x0B80, 0x0BFF);
 282                 range(0x0C00, 0x0C7F);
 283                 range(0x0C80, 0x0CFF);
 284                 range(0x0D00, 0x0D7F);
 285                 range(0x0D80, 0x0DFF);
 286                 range(0x0E00, 0x0E7F);
 287                 range(0x0E80, 0x0EFF);
 288                 range(0x0F00, 0x0FFF);
 289                 range(0x1000, 0x109F);
 290                 range(0x10A0, 0x10FF);
 291                 range(0x1100, 0x11FF);
 292                 range(0x1200, 0x137F);
 293                 range(0x1380, 0x139F);
 294                 range(0x13A0, 0x13FF);
 295                 range(0x1400, 0x167F);
 296                 range(0x1680, 0x169F);
 297                 range(0x16A0, 0x16FF);
 298                 range(0x1700, 0x171F);
 299                 range(0x1720, 0x173F);
 300                 range(0x1740, 0x175F);
 301                 range(0x1760, 0x177F);
 302                 range(0x1780, 0x17FF);
 303                 range(0x1800, 0x18AF);
 304                 range(0x18B0, 0x18FF);
 305                 range(0x1900, 0x194F);
 306                 range(0x1950, 0x197F);
 307                 range(0x1980, 0x19DF);
 308                 range(0x19E0, 0x19FF);
 309                 range(0x1A00, 0x1A1F);
 310                 range(0x1A20, 0x1AAF);
 311                 range(0x1B00, 0x1B7F);
 312                 range(0x1B80, 0x1BBF);
 313                 range(0x1BC0, 0x1BFF);
 314                 range(0x1C00, 0x1C4F);
 315                 range(0x1C50, 0x1C7F);
 316                 range(0x1CC0, 0x1CCF);
 317                 range(0x1CD0, 0x1CFF);
 318                 range(0x1D00, 0x1D7F);
 319                 range(0x1D80, 0x1DBF);
 320                 range(0x1DC0, 0x1DFF);
 321                 range(0x1E00, 0x1EFF);
 322                 range(0x1F00, 0x1FFF);
 323                 range(0x2000, 0x206F);
 324                 range(0x2070, 0x209F);
 325                 range(0x20A0, 0x20CF);
 326                 range(0x20D0, 0x20FF);
 327                 range(0x2100, 0x214F);
 328                 range(0x2150, 0x218F);
 329                 range(0x2190, 0x21FF);
 330                 range(0x2200, 0x22FF);
 331                 range(0x2300, 0x23FF);
 332                 range(0x2400, 0x243F);
 333                 range(0x2440, 0x245F);
 334                 range(0x2460, 0x24FF);
 335                 range(0x2500, 0x257F);
 336                 range(0x2580, 0x259F);
 337                 range(0x25A0, 0x25FF);
 338                 range(0x2600, 0x26FF);
 339                 range(0x2700, 0x27BF);
 340                 range(0x27C0, 0x27EF);
 341                 range(0x27F0, 0x27FF);
 342                 range(0x2800, 0x28FF);
 343                 range(0x2900, 0x297F);
 344                 range(0x2980, 0x29FF);
 345                 range(0x2A00, 0x2AFF);
 346                 range(0x2B00, 0x2BFF);
 347                 range(0x2C00, 0x2C5F);
 348                 range(0x2C60, 0x2C7F);
 349                 range(0x2C80, 0x2CFF);
 350                 range(0x2D00, 0x2D2F);
 351                 range(0x2D30, 0x2D7F);
 352                 range(0x2D80, 0x2DDF);
 353                 range(0x2DE0, 0x2DFF);
 354                 range(0x2E00, 0x2E7F);
 355                 range(0x2E80, 0x2EFF);
 356                 range(0x2F00, 0x2FDF);
 357                 range(0x2FF0, 0x2FFF);
 358                 range(0x3000, 0x303F);
 359                 range(0x3040, 0x309F);
 360                 range(0x30A0, 0x30FF);
 361                 range(0x3100, 0x312F);
 362                 range(0x3130, 0x318F);
 363                 range(0x3190, 0x319F);
 364                 range(0x31A0, 0x31BF);
 365                 range(0x31C0, 0x31EF);
 366                 range(0x31F0, 0x31FF);
 367                 range(0x3200, 0x32FF);
 368                 range(0x3300, 0x33FF);
 369                 range(0x3400, 0x4DBF);
 370                 range(0x4DC0, 0x4DFF);
 371                 range(0x4E00, 0x9FFF);
 372                 range(0xA000, 0xA48F);
 373                 range(0xA490, 0xA4CF);
 374                 range(0xA4D0, 0xA4FF);
 375                 range(0xA500, 0xA63F);
 376                 range(0xA640, 0xA69F);
 377                 range(0xA6A0, 0xA6FF);
 378                 range(0xA700, 0xA71F);
 379                 range(0xA720, 0xA7FF);
 380                 range(0xA800, 0xA82F);
 381                 range(0xA830, 0xA83F);
 382                 range(0xA840, 0xA87F);
 383                 range(0xA880, 0xA8DF);
 384                 range(0xA8E0, 0xA8FF);
 385                 range(0xA900, 0xA92F);
 386                 range(0xA930, 0xA95F);
 387                 range(0xA960, 0xA97F);
 388                 range(0xA980, 0xA9DF);
 389                 range(0xAA00, 0xAA5F);
 390                 range(0xAA60, 0xAA7F);
 391                 range(0xAA80, 0xAADF);
 392                 range(0xAAE0, 0xAAFF);
 393                 range(0xAB00, 0xAB2F);
 394                 range(0xABC0, 0xABFF);
 395                 range(0xAC00, 0xD7AF);
 396                 range(0xD7B0, 0xD7FF);
 397                 range(0xD800, 0xDB7F);
 398                 range(0xDB80, 0xDBFF);
 399                 range(0xDC00, 0xDFFF);
 400                 range(0xE000, 0xF8FF);
 401                 range(0xF900, 0xFAFF);
 402                 range(0xFB00, 0xFB4F);
 403                 range(0xFB50, 0xFDFF);
 404                 range(0xFE00, 0xFE0F);
 405                 range(0xFE10, 0xFE1F);
 406                 range(0xFE20, 0xFE2F);
 407                 range(0xFE30, 0xFE4F);
 408                 range(0xFE50, 0xFE6F);
 409                 range(0xFE70, 0xFEFF);
 410                 range(0xFF00, 0xFFEF);
 411                 range(0xFFF0, 0xFFFF);
 412                 range(0x10000, 0x1007F);
 413                 range(0x10080, 0x100FF);
 414                 range(0x10100, 0x1013F);
 415                 range(0x10140, 0x1018F);
 416                 range(0x10190, 0x101CF);
 417                 range(0x101D0, 0x101FF);
 418                 range(0x10280, 0x1029F);
 419                 range(0x102A0, 0x102DF);
 420                 range(0x10300, 0x1032F);
 421                 range(0x10330, 0x1034F);
 422                 range(0x10380, 0x1039F);
 423                 range(0x103A0, 0x103DF);
 424                 range(0x10400, 0x1044F);
 425                 range(0x10450, 0x1047F);
 426                 range(0x10480, 0x104AF);
 427                 range(0x10800, 0x1083F);
 428                 range(0x10840, 0x1085F);
 429                 range(0x10900, 0x1091F);
 430                 range(0x10920, 0x1093F);
 431                 range(0x10980, 0x1099F);
 432                 range(0x109A0, 0x109FF);
 433                 range(0x10A00, 0x10A5F);
 434                 range(0x10A60, 0x10A7F);
 435                 range(0x10B00, 0x10B3F);
 436                 range(0x10B40, 0x10B5F);
 437                 range(0x10B60, 0x10B7F);
 438                 range(0x10C00, 0x10C4F);
 439                 range(0x10E60, 0x10E7F);
 440                 range(0x11000, 0x1107F);
 441                 range(0x11080, 0x110CF);
 442                 range(0x110D0, 0x110FF);
 443                 range(0x11100, 0x1114F);
 444                 range(0x11180, 0x111DF);
 445                 range(0x11680, 0x116CF);
 446                 range(0x12000, 0x123FF);
 447                 range(0x12400, 0x1247F);
 448                 range(0x13000, 0x1342F);
 449                 range(0x16800, 0x16A3F);
 450                 range(0x16F00, 0x16F9F);
 451                 range(0x1B000, 0x1B0FF);
 452                 range(0x1D000, 0x1D0FF);
 453                 range(0x1D100, 0x1D1FF);
 454                 range(0x1D200, 0x1D24F);
 455                 range(0x1D300, 0x1D35F);
 456                 range(0x1D360, 0x1D37F);
 457                 range(0x1D400, 0x1D7FF);
 458                 range(0x1EE00, 0x1EEFF);
 459                 range(0x1F000, 0x1F02F);
 460                 range(0x1F030, 0x1F09F);
 461                 range(0x1F0A0, 0x1F0FF);
 462                 range(0x1F100, 0x1F1FF);
 463                 range(0x1F200, 0x1F2FF);
 464                 range(0x1F300, 0x1F5FF);
 465                 range(0x1F600, 0x1F64F);
 466                 range(0x1F680, 0x1F6FF);
 467                 range(0x1F700, 0x1F77F);
 468                 range(0x20000, 0x2A6DF);
 469                 range(0x2A700, 0x2B73F);
 470                 range(0x2B740, 0x2B81F);
 471                 range(0x2F800, 0x2FA1F);
 472                 range(0xE0000, 0xE007F);
 473                 range(0xE0100, 0xE01EF);
 474                 range(0xF0000, 0xFFFFF);
 475                 range(0x100000, 0x10FFFF);
 476 */