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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Pdf\Document; |
| 16 | |
| 17 | use Pop\Pdf\Build\Font\AbstractFont; |
| 18 | use Pop\Pdf\Build\Font\Exception as FontException; |
| 19 | use Pop\Pdf\Build\Font\Parser; |
| 20 | use Pop\Pdf\Build\Font\TrueType; |
| 21 | use InvalidArgumentException; |
| 22 | |
| 23 | /** |
| 24 | * Pdf font class |
| 25 | * |
| 26 | * @category Pop |
| 27 | * @package Pop\Pdf |
| 28 | * @author Nick Sagona, III <nick@popphp.org> |
| 29 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 30 | * @license https://www.popphp.org/license New BSD License |
| 31 | * @version 6.0.0 |
| 32 | */ |
| 33 | class Font |
| 34 | { |
| 35 | |
| 36 | /** |
| 37 | * Standard font constants |
| 38 | */ |
| 39 | const ARIAL = 'Arial'; |
| 40 | const ARIAL_ITALIC = 'Arial,Italic'; |
| 41 | const ARIAL_BOLD = 'Arial,Bold'; |
| 42 | const ARIAL_BOLD_ITALIC = 'Arial,BoldItalic'; |
| 43 | const COURIER = 'Courier'; |
| 44 | const COURIER_OBLIQUE = 'Courier-Oblique'; |
| 45 | const COURIER_BOLD = 'Courier-Bold'; |
| 46 | const COURIER_BOLD_OBLIQUE = 'Courier-BoldOblique'; |
| 47 | const COURIER_NEW = 'CourierNew'; |
| 48 | const COURIER_NEW_ITALIC = 'CourierNew,Italic'; |
| 49 | const COURIER_NEW_BOLD = 'CourierNew,Bold'; |
| 50 | const COURIER_NEW_BOLD_ITALIC = 'CourierNew,BoldItalic'; |
| 51 | const HELVETICA = 'Helvetica'; |
| 52 | const HELVETICA_OBLIQUE = 'Helvetica-Oblique'; |
| 53 | const HELVETICA_BOLD = 'Helvetica-Bold'; |
| 54 | const HELVETICA_BOLD_OBLIQUE = 'Helvetica-BoldOblique'; |
| 55 | const SYMBOL = 'Symbol'; |
| 56 | const TIMES_ROMAN = 'Times-Roman'; |
| 57 | const TIMES_BOLD = 'Times-Bold'; |
| 58 | const TIMES_ITALIC = 'Times-Italic'; |
| 59 | const TIMES_BOLD_ITALIC = 'Times-BoldItalic'; |
| 60 | const TIMES_NEW_ROMAN = 'TimesNewRoman'; |
| 61 | const TIMES_NEW_ROMAN_ITALIC = 'TimesNewRoman,Italic'; |
| 62 | const TIMES_NEW_ROMAN_BOLD = 'TimesNewRoman,Bold'; |
| 63 | const TIMES_NEW_ROMAN_BOLDITALIC = 'TimesNewRoman,BoldItalic'; |
| 64 | const ZAPF_DINGBATS = 'ZapfDingbats'; |
| 65 | |
| 66 | /** |
| 67 | * Standard PDF fonts |
| 68 | * @var array |
| 69 | */ |
| 70 | protected array $standardFonts = [ |
| 71 | 'Arial', 'Arial,Italic', 'Arial,Bold', 'Arial,BoldItalic', 'Courier', 'CourierNew', 'Courier-Oblique', |
| 72 | 'CourierNew,Italic', 'Courier-Bold', 'CourierNew,Bold', 'Courier-BoldOblique', 'CourierNew,BoldItalic', |
| 73 | 'Helvetica', 'Helvetica-Oblique', 'Helvetica-Bold', 'Helvetica-BoldOblique', 'Symbol', 'Times-Roman', |
| 74 | 'Times-Bold', 'Times-Italic', 'Times-BoldItalic', 'TimesNewRoman', 'TimesNewRoman,Italic', |
| 75 | 'TimesNewRoman,Bold', 'TimesNewRoman,BoldItalic', 'ZapfDingbats' |
| 76 | ]; |
| 77 | |
| 78 | /** |
| 79 | * Font |
| 80 | * @var ?string |
| 81 | */ |
| 82 | protected ?string $font = null; |
| 83 | |
| 84 | /** |
| 85 | * Font name |
| 86 | * @var ?string |
| 87 | */ |
| 88 | protected ?string $name = null; |
| 89 | |
| 90 | /** |
| 91 | * Flag for a standard font |
| 92 | * @var bool |
| 93 | */ |
| 94 | protected bool $isStandard = false; |
| 95 | |
| 96 | /** |
| 97 | * Flag for an embedded font file |
| 98 | * @var bool |
| 99 | */ |
| 100 | protected bool$isEmbedded = false; |
| 101 | |
| 102 | /** |
| 103 | * Font parser |
| 104 | * @var ?Parser |
| 105 | */ |
| 106 | protected ?Parser $parser = null; |
| 107 | |
| 108 | /** |
| 109 | * Cached standard-font instance (shared by getStringWidth() and hasGlyph()) |
| 110 | * |
| 111 | * Lazily built by standardFontInstance() and invalidated automatically |
| 112 | * whenever the selected standard font changes (it's only reused when it's |
| 113 | * already an instance of the currently-selected font's class). |
| 114 | * |
| 115 | * @var ?\Pop\Pdf\Build\Font\Standard\AbstractStandard |
| 116 | */ |
| 117 | protected ?\Pop\Pdf\Build\Font\Standard\AbstractStandard $standardFontInstance = null; |
| 118 | |
| 119 | /** |
| 120 | * Constructor |
| 121 | * |
| 122 | * Instantiate a PDF font. |
| 123 | * |
| 124 | * @param ?string $font |
| 125 | */ |
| 126 | public function __construct(?string $font = null) |
| 127 | { |
| 128 | if ($font !== null) { |
| 129 | $this->setFont($font); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Get standard PDF fonts in an array |
| 135 | * |
| 136 | * @return array |
| 137 | */ |
| 138 | public static function standardFonts(): array |
| 139 | { |
| 140 | return (new self())->getStandardFonts(); |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Set font |
| 145 | * |
| 146 | * @param string $font |
| 147 | * @throws InvalidArgumentException|\Pop\Pdf\Build\Font\Exception |
| 148 | * @return Font |
| 149 | */ |
| 150 | public function setFont(string $font): Font |
| 151 | { |
| 152 | $this->font = $font; |
| 153 | if (in_array($font, $this->standardFonts)) { |
| 154 | $this->isStandard = true; |
| 155 | $this->name = $font; |
| 156 | } else if (file_exists($font)) { |
| 157 | $this->isEmbedded = true; |
| 158 | $this->parser = new Parser($this->font); |
| 159 | $this->name = $this->parser->getFontName(); |
| 160 | } else { |
| 161 | throw new InvalidArgumentException( |
| 162 | "Error: The font '" . $font . "' is not valid. It must be a standard PDF font or a font file." |
| 163 | ); |
| 164 | } |
| 165 | |
| 166 | return $this; |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Get font |
| 171 | * |
| 172 | * @return ?string |
| 173 | */ |
| 174 | public function getFont(): ?string |
| 175 | { |
| 176 | return $this->font; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Get font name |
| 181 | * |
| 182 | * @return ?string |
| 183 | */ |
| 184 | public function getName(): ?string |
| 185 | { |
| 186 | return $this->name; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Determine if the font is a standard font |
| 191 | * |
| 192 | * @return bool |
| 193 | */ |
| 194 | public function isStandard(): bool |
| 195 | { |
| 196 | return $this->isStandard; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Determine if the font is an embedded font |
| 201 | * |
| 202 | * @return bool |
| 203 | */ |
| 204 | public function isEmbedded(): bool |
| 205 | { |
| 206 | return $this->isEmbedded; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Determine if the font is an embedded CID (TrueType/OpenType) font |
| 211 | * |
| 212 | * Type1 (.pfb) embedded fonts and standard fonts are not CID fonts - |
| 213 | * they stay on the single-byte encoding path. |
| 214 | * |
| 215 | * @return bool |
| 216 | */ |
| 217 | public function isCid(): bool |
| 218 | { |
| 219 | return $this->isEmbedded && ($this->parser->getFont() instanceof TrueType); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Split a UTF-8 string into its UTF-16BE code units |
| 224 | * |
| 225 | * Matches the BMP-only convention already used by getStringWidth() and |
| 226 | * Build\Font\AbstractFont::getStringWidth() - sufficient for Cyrillic, |
| 227 | * Greek, and the vast majority of non-Latin scripts short of rare |
| 228 | * astral-plane characters (e.g. some CJK extensions, emoji). |
| 229 | * |
| 230 | * @param string $string |
| 231 | * @return array |
| 232 | */ |
| 233 | public static function stringToCodeUnits(string $string): array |
| 234 | { |
| 235 | $codeUnits = []; |
| 236 | $utf16 = iconv('UTF-8', 'UTF-16BE//IGNORE', $string); |
| 237 | |
| 238 | for ($i = 0; $i < strlen($utf16); $i += 2) { |
| 239 | $codeUnits[] = (ord($utf16[$i]) << 8) | ord($utf16[$i + 1]); |
| 240 | } |
| 241 | |
| 242 | return $codeUnits; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Determine if this font has a glyph for the given UTF-16BE code unit |
| 247 | * |
| 248 | * Type1 embedded fonts are not validated (always returns true) - their |
| 249 | * glyph coverage isn't tracked by codepoint the way standard and CID |
| 250 | * fonts are. |
| 251 | * |
| 252 | * @param int $codeUnit |
| 253 | * @return bool |
| 254 | */ |
| 255 | public function hasGlyph(int $codeUnit): bool |
| 256 | { |
| 257 | if ($this->isCid()) { |
| 258 | return $this->getGlyphId($codeUnit) !== null; |
| 259 | } else if ($this->isStandard) { |
| 260 | return $this->standardFontInstance()->hasGlyph($codeUnit); |
| 261 | } |
| 262 | |
| 263 | return true; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Get the glyph ID for the given UTF-16BE code unit in this CID font |
| 268 | * |
| 269 | * @param int $codeUnit |
| 270 | * @return ?int |
| 271 | */ |
| 272 | public function getGlyphId(int $codeUnit): ?int |
| 273 | { |
| 274 | if (!$this->isCid()) { |
| 275 | return null; |
| 276 | } |
| 277 | |
| 278 | $font = $this->parser->getFont(); |
| 279 | return $font['cmap']['glyphNumbers'][$codeUnit] ?? null; |
| 280 | } |
| 281 | |
| 282 | /** |
| 283 | * Assert every character in the string is covered by this font, throwing otherwise |
| 284 | * |
| 285 | * @param string $string |
| 286 | * @throws FontException |
| 287 | * @return void |
| 288 | */ |
| 289 | public function requireGlyphCoverage(string $string): void |
| 290 | { |
| 291 | foreach (self::stringToCodeUnits($string) as $codeUnit) { |
| 292 | if (!$this->hasGlyph($codeUnit)) { |
| 293 | throw new FontException(sprintf( |
| 294 | "Error: The font '%s' does not contain a glyph for character '%s' (U+%04X).", |
| 295 | $this->getName(), mb_chr($codeUnit), $codeUnit |
| 296 | )); |
| 297 | } |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * Convert a string to a big-endian glyph-ID hex string for this CID font's content stream |
| 303 | * |
| 304 | * @param string $string |
| 305 | * @throws FontException |
| 306 | * @return string |
| 307 | */ |
| 308 | public function stringToGidHex(string $string): string |
| 309 | { |
| 310 | $this->requireGlyphCoverage($string); |
| 311 | |
| 312 | $hex = ''; |
| 313 | foreach (self::stringToCodeUnits($string) as $codeUnit) { |
| 314 | $hex .= sprintf('%04X', $this->getGlyphId($codeUnit)); |
| 315 | } |
| 316 | |
| 317 | return $hex; |
| 318 | } |
| 319 | |
| 320 | /** |
| 321 | * Instantiate this font's standard-font class (shared by getStringWidth() and hasGlyph()) |
| 322 | * |
| 323 | * @throws Exception |
| 324 | * @return \Pop\Pdf\Build\Font\Standard\AbstractStandard |
| 325 | */ |
| 326 | protected function standardFontInstance(): \Pop\Pdf\Build\Font\Standard\AbstractStandard |
| 327 | { |
| 328 | $fontClass = '\Pop\Pdf\Build\Font\Standard\\' . str_replace([',', '-'], ['', ''], $this->name); |
| 329 | if (!class_exists($fontClass)) { |
| 330 | throw new Exception('Error: That standard font class was not found.'); |
| 331 | } |
| 332 | if (!($this->standardFontInstance instanceof $fontClass)) { |
| 333 | $this->standardFontInstance = new $fontClass(); |
| 334 | } |
| 335 | return $this->standardFontInstance; |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * Get available standard fonts |
| 340 | * |
| 341 | * @return array |
| 342 | */ |
| 343 | public function getStandardFonts(): array |
| 344 | { |
| 345 | return $this->standardFonts; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Get the font parser |
| 350 | * |
| 351 | * @return ?AbstractFont |
| 352 | */ |
| 353 | public function getParsedFont(): ?AbstractFont |
| 354 | { |
| 355 | return ($this->parser !== null) ? $this->parser->getFont() : null; |
| 356 | } |
| 357 | |
| 358 | /** |
| 359 | * Attempt to get string width |
| 360 | * |
| 361 | * @param string $string |
| 362 | * @param int|float $size |
| 363 | * @throws Exception |
| 364 | * @return mixed |
| 365 | */ |
| 366 | public function getStringWidth(string $string, int|float $size): mixed |
| 367 | { |
| 368 | if ($this->parser !== null) { |
| 369 | return $this->parser->getFont()->getStringWidth($string, $size); |
| 370 | } else { |
| 371 | $font = $this->standardFontInstance(); |
| 372 | $widths = []; |
| 373 | |
| 374 | $drawingString = iconv('UTF-8', 'UTF-16BE//IGNORE', $string); |
| 375 | $characters = []; |
| 376 | |
| 377 | for ($i = 0; $i < strlen($drawingString); $i++) { |
| 378 | $characters[] = (ord($drawingString[$i++]) << 8 ) | ord($drawingString[$i]); |
| 379 | } |
| 380 | |
| 381 | foreach ($characters as $character) { |
| 382 | $widths[] = $font->getGlyphWidth($character); |
| 383 | } |
| 384 | |
| 385 | return (array_sum($widths) / $font->getUnitsPerEm()) * $size; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * Get the font parser |
| 391 | * |
| 392 | * @return ?Parser |
| 393 | */ |
| 394 | public function parser(): ?Parser |
| 395 | { |
| 396 | return $this->parser; |
| 397 | } |
| 398 | |
| 399 | } |