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| 1 | <?php |
| 2 | |
| 3 | namespace WebPConvert\Convert\Converters; |
| 4 | |
| 5 | use WebPConvert\Convert\Converters\AbstractConverter; |
| 6 | use WebPConvert\Convert\Exceptions\ConversionFailed\ConverterNotOperational\SystemRequirementsNotMetException; |
| 7 | use WebPConvert\Convert\Exceptions\ConversionFailed\InvalidInputException; |
| 8 | use WebPConvert\Convert\Exceptions\ConversionFailedException; |
| 9 | |
| 10 | /** |
| 11 | * Convert images to webp using gd extension. |
| 12 | * |
| 13 | * @package WebPConvert |
| 14 | * @author Bjørn Rosell <it@rosell.dk> |
| 15 | * @since Class available since Release 2.0.0 |
| 16 | */ |
| 17 | class Gd extends AbstractConverter |
| 18 | { |
| 19 | public function supportsLossless() |
| 20 | { |
| 21 | return false; |
| 22 | } |
| 23 | |
| 24 | protected function getUnsupportedDefaultOptions() |
| 25 | { |
| 26 | return [ |
| 27 | 'alpha-quality', |
| 28 | 'auto-filter', |
| 29 | 'encoding', |
| 30 | 'low-memory', |
| 31 | 'metadata', |
| 32 | 'method', |
| 33 | 'near-lossless', |
| 34 | 'preset', |
| 35 | 'sharp-yuv', |
| 36 | 'size-in-percentage', |
| 37 | ]; |
| 38 | } |
| 39 | |
| 40 | private $errorMessageWhileCreating = ''; |
| 41 | private $errorNumberWhileCreating; |
| 42 | |
| 43 | /** |
| 44 | * Check (general) operationality of Gd converter. |
| 45 | * |
| 46 | * @throws SystemRequirementsNotMetException if system requirements are not met |
| 47 | */ |
| 48 | public function checkOperationality() |
| 49 | { |
| 50 | if (!extension_loaded('gd')) { |
| 51 | throw new SystemRequirementsNotMetException('Required Gd extension is not available.'); |
| 52 | } |
| 53 | |
| 54 | if (!function_exists('imagewebp')) { |
| 55 | throw new SystemRequirementsNotMetException( |
| 56 | 'Gd has been compiled without webp support.' |
| 57 | ); |
| 58 | } |
| 59 | |
| 60 | if (!function_exists('imagepalettetotruecolor')) { |
| 61 | if (!self::functionsExist([ |
| 62 | 'imagecreatetruecolor', 'imagealphablending', 'imagecolorallocatealpha', |
| 63 | 'imagefilledrectangle', 'imagecopy', 'imagedestroy', 'imagesx', 'imagesy' |
| 64 | ])) { |
| 65 | throw new SystemRequirementsNotMetException( |
| 66 | 'Gd cannot convert palette color images to RGB. ' . |
| 67 | 'Even though it would be possible to convert RGB images to webp with Gd, ' . |
| 68 | 'we refuse to do it. A partial working converter causes more trouble than ' . |
| 69 | 'a non-working. To make this converter work, you need the imagepalettetotruecolor() ' . |
| 70 | 'function to be enabled on your system.' |
| 71 | ); |
| 72 | } |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Check if specific file is convertable with current converter / converter settings. |
| 78 | * |
| 79 | * @throws SystemRequirementsNotMetException if Gd has been compiled without support for image type |
| 80 | */ |
| 81 | public function checkConvertability() |
| 82 | { |
| 83 | $mimeType = $this->getMimeTypeOfSource(); |
| 84 | switch ($mimeType) { |
| 85 | case 'image/png': |
| 86 | if (!function_exists('imagecreatefrompng')) { |
| 87 | throw new SystemRequirementsNotMetException( |
| 88 | 'Gd has been compiled without PNG support and can therefore not convert this PNG image.' |
| 89 | ); |
| 90 | } |
| 91 | break; |
| 92 | |
| 93 | case 'image/jpeg': |
| 94 | if (!function_exists('imagecreatefromjpeg')) { |
| 95 | throw new SystemRequirementsNotMetException( |
| 96 | 'Gd has been compiled without Jpeg support and can therefore not convert this jpeg image.' |
| 97 | ); |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Find out if all functions exists. |
| 104 | * |
| 105 | * @return boolean |
| 106 | */ |
| 107 | private static function functionsExist($functionNamesArr) |
| 108 | { |
| 109 | foreach ($functionNamesArr as $functionName) { |
| 110 | if (!function_exists($functionName)) { |
| 111 | return false; |
| 112 | } |
| 113 | } |
| 114 | return true; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Try to convert image pallette to true color on older systems that does not have imagepalettetotruecolor(). |
| 119 | * |
| 120 | * The aim is to function as imagepalettetotruecolor, but for older systems. |
| 121 | * So, if the image is already rgb, nothing will be done, and true will be returned |
| 122 | * PS: Got the workaround here: https://secure.php.net/manual/en/function.imagepalettetotruecolor.php |
| 123 | * |
| 124 | * @param resource|\GdImage $image |
| 125 | * @return boolean TRUE if the convertion was complete, or if the source image already is a true color image, |
| 126 | * otherwise FALSE is returned. |
| 127 | */ |
| 128 | private function makeTrueColorUsingWorkaround(&$image) |
| 129 | { |
| 130 | //return $this->makeTrueColor($image); |
| 131 | /* |
| 132 | if (function_exists('imageistruecolor') && imageistruecolor($image)) { |
| 133 | return true; |
| 134 | }*/ |
| 135 | if (self::functionsExist(['imagecreatetruecolor', 'imagealphablending', 'imagecolorallocatealpha', |
| 136 | 'imagefilledrectangle', 'imagecopy', 'imagedestroy', 'imagesx', 'imagesy'])) { |
| 137 | $dst = imagecreatetruecolor(imagesx($image), imagesy($image)); |
| 138 | |
| 139 | if ($dst === false) { |
| 140 | return false; |
| 141 | } |
| 142 | |
| 143 | $success = false; |
| 144 | |
| 145 | //prevent blending with default black |
| 146 | if (imagealphablending($dst, false) !== false) { |
| 147 | //change the RGB values if you need, but leave alpha at 127 |
| 148 | $transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127); |
| 149 | |
| 150 | if ($transparent !== false) { |
| 151 | //simpler than flood fill |
| 152 | if (imagefilledrectangle($dst, 0, 0, imagesx($image), imagesy($image), $transparent) !== false) { |
| 153 | //restore default blending |
| 154 | if (imagealphablending($dst, true) !== false) { |
| 155 | if (imagecopy($dst, $image, 0, 0, 0, 0, imagesx($image), imagesy($image)) !== false) { |
| 156 | $success = true; |
| 157 | } |
| 158 | }; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | if ($success) { |
| 163 | imagedestroy($image); |
| 164 | $image = $dst; |
| 165 | } else { |
| 166 | imagedestroy($dst); |
| 167 | } |
| 168 | return $success; |
| 169 | } else { |
| 170 | // The necessary methods for converting color palette are not avalaible |
| 171 | return false; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Try to convert image pallette to true color. |
| 177 | * |
| 178 | * Try to convert image pallette to true color. If imagepalettetotruecolor() exists, that is used (available from |
| 179 | * PHP >= 5.5.0). Otherwise using workaround found on the net. |
| 180 | * |
| 181 | * @param resource|\GdImage $image |
| 182 | * @return boolean TRUE if the convertion was complete, or if the source image already is a true color image, |
| 183 | * otherwise FALSE is returned. |
| 184 | */ |
| 185 | private function makeTrueColor(&$image) |
| 186 | { |
| 187 | if (function_exists('imagepalettetotruecolor')) { |
| 188 | return imagepalettetotruecolor($image); |
| 189 | } else { |
| 190 | $this->logLn( |
| 191 | 'imagepalettetotruecolor() is not available on this system - using custom implementation instead' |
| 192 | ); |
| 193 | return $this->makeTrueColorUsingWorkaround($image); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Create Gd image resource from source |
| 199 | * |
| 200 | * @throws InvalidInputException if mime type is unsupported or could not be detected |
| 201 | * @throws ConversionFailedException if imagecreatefrompng or imagecreatefromjpeg fails |
| 202 | * @return resource|\GdImage $image The created image |
| 203 | */ |
| 204 | private function createImageResource() |
| 205 | { |
| 206 | $mimeType = $this->getMimeTypeOfSource(); |
| 207 | |
| 208 | switch ($mimeType) { |
| 209 | case 'image/png': |
| 210 | $image = imagecreatefrompng($this->source); |
| 211 | if ($image === false) { |
| 212 | throw new ConversionFailedException( |
| 213 | 'Gd failed when trying to load/create image (imagecreatefrompng() failed)' |
| 214 | ); |
| 215 | } |
| 216 | return $image; |
| 217 | |
| 218 | case 'image/jpeg': |
| 219 | $image = imagecreatefromjpeg($this->source); |
| 220 | if ($image === false) { |
| 221 | throw new ConversionFailedException( |
| 222 | 'Gd failed when trying to load/create image (imagecreatefromjpeg() failed)' |
| 223 | ); |
| 224 | } |
| 225 | return $image; |
| 226 | } |
| 227 | |
| 228 | throw new InvalidInputException('Unsupported mime type'); |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Try to make image resource true color if it is not already. |
| 233 | * |
| 234 | * @param resource|\GdImage $image The image to work on |
| 235 | * @return boolean|null True if it is now true color. False if it is NOT true color. null, if we cannot tell |
| 236 | */ |
| 237 | protected function tryToMakeTrueColorIfNot(&$image) |
| 238 | { |
| 239 | $whatIsItNow = null; |
| 240 | $mustMakeTrueColor = false; |
| 241 | if (function_exists('imageistruecolor')) { |
| 242 | if (imageistruecolor($image)) { |
| 243 | $this->logLn('image is true color'); |
| 244 | $whatIsItNow = true; |
| 245 | } else { |
| 246 | $this->logLn('image is not true color'); |
| 247 | $mustMakeTrueColor = true; |
| 248 | $whatIsItNow = false; |
| 249 | } |
| 250 | } else { |
| 251 | $this->logLn('It can not be determined if image is true color'); |
| 252 | $mustMakeTrueColor = true; |
| 253 | } |
| 254 | |
| 255 | if ($mustMakeTrueColor) { |
| 256 | $this->logLn('converting color palette to true color'); |
| 257 | $success = $this->makeTrueColor($image); |
| 258 | if ($success) { |
| 259 | return true; |
| 260 | } else { |
| 261 | $this->logLn( |
| 262 | 'FAILED converting color palette to true color. ' |
| 263 | ); |
| 264 | } |
| 265 | } |
| 266 | return $whatIsItNow; |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * |
| 271 | * @param resource|\GdImage $image |
| 272 | * @return boolean true if alpha blending was set successfully, false otherwise |
| 273 | */ |
| 274 | protected function trySettingAlphaBlending($image) |
| 275 | { |
| 276 | if (function_exists('imagealphablending')) { |
| 277 | // TODO: Should we set second parameter to false instead? |
| 278 | // As here: https://www.texelate.co.uk/blog/retaining-png-transparency-with-php-gd |
| 279 | // (PS: I have backed up some local changes - to Gd.php, which includes changing that param |
| 280 | // to false. But I didn't finish up back then and now I forgot, so need to retest before |
| 281 | // changing anything... |
| 282 | if (!imagealphablending($image, true)) { |
| 283 | $this->logLn('Warning: imagealphablending() failed'); |
| 284 | return false; |
| 285 | } |
| 286 | } else { |
| 287 | $this->logLn( |
| 288 | 'Warning: imagealphablending() is not available on your system.' . |
| 289 | ' Converting PNGs with transparency might fail on some systems' |
| 290 | ); |
| 291 | return false; |
| 292 | } |
| 293 | |
| 294 | if (function_exists('imagesavealpha')) { |
| 295 | if (!imagesavealpha($image, true)) { |
| 296 | $this->logLn('Warning: imagesavealpha() failed'); |
| 297 | return false; |
| 298 | } |
| 299 | } else { |
| 300 | $this->logLn( |
| 301 | 'Warning: imagesavealpha() is not available on your system. ' . |
| 302 | 'Converting PNGs with transparency might fail on some systems' |
| 303 | ); |
| 304 | return false; |
| 305 | } |
| 306 | return true; |
| 307 | } |
| 308 | |
| 309 | protected function errorHandlerWhileCreatingWebP($errno, $errstr, $errfile, $errline) |
| 310 | { |
| 311 | $this->errorNumberWhileCreating = $errno; |
| 312 | $this->errorMessageWhileCreating = $errstr . ' in ' . $errfile . ', line ' . $errline . |
| 313 | ', PHP ' . PHP_VERSION . ' (' . PHP_OS . ')'; |
| 314 | //return false; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * |
| 319 | * @param resource|\GdImage $image |
| 320 | * @return void |
| 321 | */ |
| 322 | protected function destroyAndRemove($image) |
| 323 | { |
| 324 | imagedestroy($image); |
| 325 | if (file_exists($this->destination)) { |
| 326 | unlink($this->destination); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * |
| 332 | * @param resource|\GdImage $image |
| 333 | * @return void |
| 334 | */ |
| 335 | protected function tryConverting($image) |
| 336 | { |
| 337 | |
| 338 | // Danger zone! |
| 339 | // Using output buffering to generate image. |
| 340 | // In this zone, Do NOT do anything that might produce unwanted output |
| 341 | // Do NOT call $this->logLn |
| 342 | // --------------------------------- (start of danger zone) |
| 343 | |
| 344 | $addedZeroPadding = false; |
| 345 | set_error_handler(array($this, "errorHandlerWhileCreatingWebP")); |
| 346 | |
| 347 | // This line may trigger log, so we need to do it BEFORE ob_start() ! |
| 348 | $q = $this->getCalculatedQuality(); |
| 349 | |
| 350 | ob_start(); |
| 351 | |
| 352 | // Adding this try/catch is perhaps not neccessary. |
| 353 | // I'm not certain that the error handler takes care of Throwable errors. |
| 354 | // and - sorry - was to lazy to find out right now. So for now: better safe than sorry. #320 |
| 355 | $error = null; |
| 356 | $success = false; |
| 357 | |
| 358 | try { |
| 359 | // Beware: This call can throw FATAL on windows (cannot be catched) |
| 360 | // This for example happens on palette images |
| 361 | $success = imagewebp($image, null, $q); |
| 362 | } catch (\Exception $e) { |
| 363 | $error = $e; |
| 364 | } catch (\Throwable $e) { |
| 365 | $error = $e; |
| 366 | } |
| 367 | if (!is_null($error)) { |
| 368 | restore_error_handler(); |
| 369 | ob_end_clean(); |
| 370 | $this->destroyAndRemove($image); |
| 371 | throw $error; |
| 372 | } |
| 373 | if (!$success) { |
| 374 | $this->destroyAndRemove($image); |
| 375 | ob_end_clean(); |
| 376 | restore_error_handler(); |
| 377 | throw new ConversionFailedException( |
| 378 | 'Failed creating image. Call to imagewebp() failed.', |
| 379 | $this->errorMessageWhileCreating |
| 380 | ); |
| 381 | } |
| 382 | |
| 383 | |
| 384 | // The following hack solves an `imagewebp` bug |
| 385 | // See https://stackoverflow.com/questions/30078090/imagewebp-php-creates-corrupted-webp-files |
| 386 | if (ob_get_length() % 2 == 1) { |
| 387 | echo "\0"; |
| 388 | $addedZeroPadding = true; |
| 389 | } |
| 390 | $output = ob_get_clean(); |
| 391 | restore_error_handler(); |
| 392 | |
| 393 | if ($output == '') { |
| 394 | $this->destroyAndRemove($image); |
| 395 | throw new ConversionFailedException( |
| 396 | 'Gd failed: imagewebp() returned empty string' |
| 397 | ); |
| 398 | } |
| 399 | |
| 400 | // --------------------------------- (end of danger zone). |
| 401 | |
| 402 | |
| 403 | if ($this->errorMessageWhileCreating != '') { |
| 404 | switch ($this->errorNumberWhileCreating) { |
| 405 | case E_WARNING: |
| 406 | $this->logLn('An warning was produced during conversion: ' . $this->errorMessageWhileCreating); |
| 407 | break; |
| 408 | case E_NOTICE: |
| 409 | $this->logLn('An notice was produced during conversion: ' . $this->errorMessageWhileCreating); |
| 410 | break; |
| 411 | default: |
| 412 | $this->destroyAndRemove($image); |
| 413 | throw new ConversionFailedException( |
| 414 | 'An error was produced during conversion', |
| 415 | $this->errorMessageWhileCreating |
| 416 | ); |
| 417 | //break; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | if ($addedZeroPadding) { |
| 422 | $this->logLn( |
| 423 | 'Fixing corrupt webp by adding a zero byte ' . |
| 424 | '(older versions of Gd had a bug, but this hack fixes it)' |
| 425 | ); |
| 426 | } |
| 427 | |
| 428 | $success = file_put_contents($this->destination, $output); |
| 429 | |
| 430 | if (!$success) { |
| 431 | $this->destroyAndRemove($image); |
| 432 | throw new ConversionFailedException( |
| 433 | 'Gd failed when trying to save the image. Check file permissions!' |
| 434 | ); |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | Previous code was much simpler, but on a system, the hack was not activated (a file with uneven number of bytes |
| 439 | was created). This is puzzeling. And the old code did not provide any insights. |
| 440 | Also, perhaps having two subsequent writes to the same file could perhaps cause a problem. |
| 441 | In the new code, there is only one write. |
| 442 | However, a bad thing about the new code is that the entire webp file is read into memory. This might cause |
| 443 | memory overflow with big files. |
| 444 | Perhaps we should check the filesize of the original and only use the new code when it is smaller than |
| 445 | memory limit set in PHP by a certain factor. |
| 446 | Or perhaps only use the new code on older versions of Gd |
| 447 | https://wordpress.org/support/topic/images-not-seen-on-chrome/#post-11390284 |
| 448 | |
| 449 | Here is the old code: |
| 450 | |
| 451 | $success = imagewebp($image, $this->destination, $this->getCalculatedQuality()); |
| 452 | |
| 453 | if (!$success) { |
| 454 | throw new ConversionFailedException( |
| 455 | 'Gd failed when trying to save the image as webp (call to imagewebp() failed). ' . |
| 456 | 'It probably failed writing file. Check file permissions!' |
| 457 | ); |
| 458 | } |
| 459 | |
| 460 | |
| 461 | // This hack solves an `imagewebp` bug |
| 462 | // See https://stackoverflow.com/questions/30078090/imagewebp-php-creates-corrupted-webp-files |
| 463 | if (filesize($this->destination) % 2 == 1) { |
| 464 | file_put_contents($this->destination, "\0", FILE_APPEND); |
| 465 | } |
| 466 | */ |
| 467 | } |
| 468 | |
| 469 | // Although this method is public, do not call directly. |
| 470 | // You should rather call the static convert() function, defined in AbstractConverter, which |
| 471 | // takes care of preparing stuff before calling doConvert, and validating after. |
| 472 | protected function doActualConvert() |
| 473 | { |
| 474 | $versionString = gd_info()["GD Version"]; |
| 475 | $this->logLn('GD Version: ' . $versionString); |
| 476 | |
| 477 | // Btw: Check out processWebp here: |
| 478 | // https://github.com/Intervention/image/blob/master/src/Intervention/Image/Gd/Encoder.php |
| 479 | |
| 480 | // Create image resource |
| 481 | $image = $this->createImageResource(); |
| 482 | |
| 483 | // Try to convert color palette if it is not true color |
| 484 | $isItTrueColorNow = $this->tryToMakeTrueColorIfNot($image); |
| 485 | if ($isItTrueColorNow === false) { |
| 486 | // our tests shows that converting palette fails on all systems, |
| 487 | throw new ConversionFailedException( |
| 488 | 'Cannot convert image because it is a palette image and the palette image cannot ' . |
| 489 | 'be converted to RGB (which is required). To convert to RGB, we would need ' . |
| 490 | 'imagepalettetotruecolor(), which is not available on your system. ' . |
| 491 | 'Our workaround does not have the neccasary functions for converting to RGB either.' |
| 492 | ); |
| 493 | } |
| 494 | if (is_null($isItTrueColorNow)) { |
| 495 | $isWindows = preg_match('/^win/i', PHP_OS); |
| 496 | $isMacDarwin = preg_match('/^darwin/i', PHP_OS); // actually no problem in PHP 7.4 and 8.0 |
| 497 | if ($isWindows || $isMacDarwin) { |
| 498 | throw new ConversionFailedException( |
| 499 | 'Cannot convert image because it appears to be a palette image and the palette image ' . |
| 500 | 'cannot be converted to RGB, as you do not have imagepalettetotruecolor() enabled. ' . |
| 501 | 'Converting palette on ' . |
| 502 | ($isWindows ? 'Windows causes FATAL error' : 'Mac causes halt') . |
| 503 | 'So we abort now' |
| 504 | ); |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | if ($this->getMimeTypeOfSource() == 'image/png') { |
| 509 | if (function_exists('version_compare')) { |
| 510 | if (version_compare($versionString, "2.1.1", "<=")) { |
| 511 | $this->logLn( |
| 512 | 'BEWARE: Your version of Gd looses the alpha chanel when converting to webp.' . |
| 513 | 'You should upgrade Gd, use another converter or stop converting PNGs. ' . |
| 514 | 'See: https://github.com/rosell-dk/webp-convert/issues/238' |
| 515 | ); |
| 516 | } elseif (version_compare($versionString, "2.2.4", "<=")) { |
| 517 | $this->logLn( |
| 518 | 'BEWARE: Older versions of Gd looses the alpha chanel when converting to webp.' . |
| 519 | 'We have not tested if transparency fails on your (rather old) version of Gd. ' . |
| 520 | 'Please let us know. ' . |
| 521 | 'See: https://github.com/rosell-dk/webp-convert/issues/238' |
| 522 | ); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | // Try to set alpha blending |
| 527 | $this->trySettingAlphaBlending($image); |
| 528 | } |
| 529 | |
| 530 | // Try to convert it to webp |
| 531 | $this->tryConverting($image); |
| 532 | |
| 533 | // End of story |
| 534 | imagedestroy($image); |
| 535 | } |
| 536 | } |