src/Object/Image.php

   1 <?php
   2 /**
   3  * @file src/Object/Image.php
   4  * @brief This file contains the Image class for image processing
   5  */
   6 namespace Friendica\Object;
   7
   8 use Friendica\App;
   9 use Friendica\Core\Cache;
  10 use Friendica\Core\Config;
  11 use Friendica\Core\L10n;
  12 use Friendica\Core\System;
  13 use Friendica\Database\DBA;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\Photo;
  16 use Friendica\Util\Network;
  17 use Exception;
  18 use Imagick;
  19 use ImagickPixel;
  20
  21 /**
  22  * Class to handle images
  23  */
  24 class Image
  25 {
  26         private $image;
  27
  28         /*
  29          * Put back gd stuff, not everybody have Imagick
  30          */
  31         private $imagick;
  32         private $width;
  33         private $height;
  34         private $valid;
  35         private $type;
  36         private $types;
  37
  38         /**
  39          * @brief supported mimetypes and corresponding file extensions
  40          * @return array
  41          */
  42         public static function supportedTypes()
  43         {
  44                 if (class_exists('Imagick')) {
  45                         // Imagick::queryFormats won't help us a lot there...
  46                         // At least, not yet, other parts of friendica uses this array
  47                         $t = [
  48                                 'image/jpeg' => 'jpg',
  49                                 'image/png' => 'png',
  50                                 'image/gif' => 'gif'
  51                         ];
  52                 } else {
  53                         $t = [];
  54                         $t['image/jpeg'] ='jpg';
  55                         if (imagetypes() & IMG_PNG) {
  56                                 $t['image/png'] = 'png';
  57                         }
  58                 }
  59
  60                 return $t;
  61         }
  62
  63         /**
  64          * @brief Constructor
  65          * @param object  $data data
  66          * @param boolean $type optional, default null
  67          * @return object
  68          */
  69         public function __construct($data, $type = null)
  70         {
  71                 $this->imagick = class_exists('Imagick');
  72                 $this->types = static::supportedTypes();
  73                 if (!array_key_exists($type, $this->types)) {
  74                         $type='image/jpeg';
  75                 }
  76                 $this->type = $type;
  77
  78                 if ($this->isImagick() && $this->loadData($data)) {
  79                         return true;
  80                 } else {
  81                         // Failed to load with Imagick, fallback
  82                         $this->imagick = false;
  83                 }
  84                 return $this->loadData($data);
  85         }
  86
  87         /**
  88          * @brief Destructor
  89          * @return void
  90          */
  91         public function __destruct()
  92         {
  93                 if ($this->image) {
  94                         if ($this->isImagick()) {
  95                                 $this->image->clear();
  96                                 $this->image->destroy();
  97                                 return;
  98                         }
  99                         if (is_resource($this->image)) {
 100                                 imagedestroy($this->image);
 101                         }
 102                 }
 103         }
 104
 105         /**
 106          * @return boolean
 107          */
 108         public function isImagick()
 109         {
 110                 return $this->imagick;
 111         }
 112
 113         /**
 114          * @brief Maps Mime types to Imagick formats
 115          * @return array With with image formats (mime type as key)
 116          */
 117         public static function getFormatsMap()
 118         {
 119                 $m = [
 120                         'image/jpeg' => 'JPG',
 121                         'image/png' => 'PNG',
 122                         'image/gif' => 'GIF'
 123                 ];
 124                 return $m;
 125         }
 126
 127         /**
 128          * @param object $data data
 129          * @return boolean
 130          */
 131         private function loadData($data)
 132         {
 133                 if ($this->isImagick()) {
 134                         $this->image = new Imagick();
 135                         try {
 136                                 $this->image->readImageBlob($data);
 137                         } catch (Exception $e) {
 138                                 // Imagick couldn't use the data
 139                                 return false;
 140                         }
 141
 142                         /*
 143                          * Setup the image to the format it will be saved to
 144                          */
 145                         $map = self::getFormatsMap();
 146                         $format = $map[$this->type];
 147                         $this->image->setFormat($format);
 148
 149                         // Always coalesce, if it is not a multi-frame image it won't hurt anyway
 150                         $this->image = $this->image->coalesceImages();
 151
 152                         /*
 153                          * setup the compression here, so we'll do it only once
 154                          */
 155                         switch ($this->getType()) {
 156                                 case "image/png":
 157                                         $quality = Config::get('system', 'png_quality');
 158                                         if ((! $quality) || ($quality > 9)) {
 159                                                 $quality = PNG_QUALITY;
 160                                         }
 161                                         /*
 162                                          * From http://www.imagemagick.org/script/command-line-options.php#quality:
 163                                          *
 164                                          * 'For the MNG and PNG image formats, the quality value sets
 165                                          * the zlib compression level (quality / 10) and filter-type (quality % 10).
 166                                          * The default PNG "quality" is 75, which means compression level 7 with adaptive PNG filtering,
 167                                          * unless the image has a color map, in which case it means compression level 7 with no PNG filtering'
 168                                          */
 169                                         $quality = $quality * 10;
 170                                         $this->image->setCompressionQuality($quality);
 171                                         break;
 172                                 case "image/jpeg":
 173                                         $quality = Config::get('system', 'jpeg_quality');
 174                                         if ((! $quality) || ($quality > 100)) {
 175                                                 $quality = JPEG_QUALITY;
 176                                         }
 177                                         $this->image->setCompressionQuality($quality);
 178                         }
 179
 180                         // The 'width' and 'height' properties are only used by non-Imagick routines.
 181                         $this->width  = $this->image->getImageWidth();
 182                         $this->height = $this->image->getImageHeight();
 183                         $this->valid  = true;
 184
 185                         return true;
 186                 }
 187
 188                 $this->valid = false;
 189                 $this->image = @imagecreatefromstring($data);
 190                 if ($this->image !== false) {
 191                         $this->width  = imagesx($this->image);
 192                         $this->height = imagesy($this->image);
 193                         $this->valid  = true;
 194                         imagealphablending($this->image, false);
 195                         imagesavealpha($this->image, true);
 196
 197                         return true;
 198                 }
 199
 200                 return false;
 201         }
 202
 203         /**
 204          * @return boolean
 205          */
 206         public function isValid()
 207         {
 208                 if ($this->isImagick()) {
 209                         return ($this->image !== false);
 210                 }
 211                 return $this->valid;
 212         }
 213
 214         /**
 215          * @return mixed
 216          */
 217         public function getWidth()
 218         {
 219                 if (!$this->isValid()) {
 220                         return false;
 221                 }
 222
 223                 if ($this->isImagick()) {
 224                         return $this->image->getImageWidth();
 225                 }
 226                 return $this->width;
 227         }
 228
 229         /**
 230          * @return mixed
 231          */
 232         public function getHeight()
 233         {
 234                 if (!$this->isValid()) {
 235                         return false;
 236                 }
 237
 238                 if ($this->isImagick()) {
 239                         return $this->image->getImageHeight();
 240                 }
 241                 return $this->height;
 242         }
 243
 244         /**
 245          * @return mixed
 246          */
 247         public function getImage()
 248         {
 249                 if (!$this->isValid()) {
 250                         return false;
 251                 }
 252
 253                 if ($this->isImagick()) {
 254                         /* Clean it */
 255                         $this->image = $this->image->deconstructImages();
 256                         return $this->image;
 257                 }
 258                 return $this->image;
 259         }
 260
 261         /**
 262          * @return mixed
 263          */
 264         public function getType()
 265         {
 266                 if (!$this->isValid()) {
 267                         return false;
 268                 }
 269
 270                 return $this->type;
 271         }
 272
 273         /**
 274          * @return mixed
 275          */
 276         public function getExt()
 277         {
 278                 if (!$this->isValid()) {
 279                         return false;
 280                 }
 281
 282                 return $this->types[$this->getType()];
 283         }
 284
 285         /**
 286          * @param integer $max max dimension
 287          * @return mixed
 288          */
 289         public function scaleDown($max)
 290         {
 291                 if (!$this->isValid()) {
 292                         return false;
 293                 }
 294
 295                 $width = $this->getWidth();
 296                 $height = $this->getHeight();
 297
 298                 $dest_width = $dest_height = 0;
 299
 300                 if ((! $width)|| (! $height)) {
 301                         return false;
 302                 }
 303
 304                 if ($width > $max && $height > $max) {
 305                         // very tall image (greater than 16:9)
 306                         // constrain the width - let the height float.
 307
 308                         if ((($height * 9) / 16) > $width) {
 309                                 $dest_width = $max;
 310                                 $dest_height = intval(($height * $max) / $width);
 311                         } elseif ($width > $height) {
 312                                 // else constrain both dimensions
 313                                 $dest_width = $max;
 314                                 $dest_height = intval(($height * $max) / $width);
 315                         } else {
 316                                 $dest_width = intval(($width * $max) / $height);
 317                                 $dest_height = $max;
 318                         }
 319                 } else {
 320                         if ($width > $max) {
 321                                 $dest_width = $max;
 322                                 $dest_height = intval(($height * $max) / $width);
 323                         } else {
 324                                 if ($height > $max) {
 325                                         // very tall image (greater than 16:9)
 326                                         // but width is OK - don't do anything
 327
 328                                         if ((($height * 9) / 16) > $width) {
 329                                                 $dest_width = $width;
 330                                                 $dest_height = $height;
 331                                         } else {
 332                                                 $dest_width = intval(($width * $max) / $height);
 333                                                 $dest_height = $max;
 334                                         }
 335                                 } else {
 336                                         $dest_width = $width;
 337                                         $dest_height = $height;
 338                                 }
 339                         }
 340                 }
 341
 342                 return $this->scale($dest_width, $dest_height);
 343         }
 344
 345         /**
 346          * @param integer $degrees degrees to rotate image
 347          * @return mixed
 348          */
 349         public function rotate($degrees)
 350         {
 351                 if (!$this->isValid()) {
 352                         return false;
 353                 }
 354
 355                 if ($this->isImagick()) {
 356                         $this->image->setFirstIterator();
 357                         do {
 358                                 $this->image->rotateImage(new ImagickPixel(), -$degrees); // ImageMagick rotates in the opposite direction of imagerotate()
 359                         } while ($this->image->nextImage());
 360                         return;
 361                 }
 362
 363                 // if script dies at this point check memory_limit setting in php.ini
 364                 $this->image  = imagerotate($this->image, $degrees, 0);
 365                 $this->width  = imagesx($this->image);
 366                 $this->height = imagesy($this->image);
 367         }
 368
 369         /**
 370          * @param boolean $horiz optional, default true
 371          * @param boolean $vert  optional, default false
 372          * @return mixed
 373          */
 374         public function flip($horiz = true, $vert = false)
 375         {
 376                 if (!$this->isValid()) {
 377                         return false;
 378                 }
 379
 380                 if ($this->isImagick()) {
 381                         $this->image->setFirstIterator();
 382                         do {
 383                                 if ($horiz) {
 384                                         $this->image->flipImage();
 385                                 }
 386                                 if ($vert) {
 387                                         $this->image->flopImage();
 388                                 }
 389                         } while ($this->image->nextImage());
 390                         return;
 391                 }
 392
 393                 $w = imagesx($this->image);
 394                 $h = imagesy($this->image);
 395                 $flipped = imagecreate($w, $h);
 396                 if ($horiz) {
 397                         for ($x = 0; $x < $w; $x++) {
 398                                 imagecopy($flipped, $this->image, $x, 0, $w - $x - 1, 0, 1, $h);
 399                         }
 400                 }
 401                 if ($vert) {
 402                         for ($y = 0; $y < $h; $y++) {
 403                                 imagecopy($flipped, $this->image, 0, $y, 0, $h - $y - 1, $w, 1);
 404                         }
 405                 }
 406                 $this->image = $flipped;
 407         }
 408
 409         /**
 410          * @param string $filename filename
 411          * @return mixed
 412          */
 413         public function orient($filename)
 414         {
 415                 if ($this->isImagick()) {
 416                         // based off comment on http://php.net/manual/en/imagick.getimageorientation.php
 417                         $orientation = $this->image->getImageOrientation();
 418                         switch ($orientation) {
 419                                 case Imagick::ORIENTATION_BOTTOMRIGHT:
 420                                         $this->image->rotateimage("#000", 180);
 421                                         break;
 422                                 case Imagick::ORIENTATION_RIGHTTOP:
 423                                         $this->image->rotateimage("#000", 90);
 424                                         break;
 425                                 case Imagick::ORIENTATION_LEFTBOTTOM:
 426                                         $this->image->rotateimage("#000", -90);
 427                                         break;
 428                         }
 429
 430                         $this->image->setImageOrientation(Imagick::ORIENTATION_TOPLEFT);
 431                         return true;
 432                 }
 433                 // based off comment on http://php.net/manual/en/function.imagerotate.php
 434
 435                 if (!$this->isValid()) {
 436                         return false;
 437                 }
 438
 439                 if ((!function_exists('exif_read_data')) || ($this->getType() !== 'image/jpeg')) {
 440                         return;
 441                 }
 442
 443                 $exif = @exif_read_data($filename, null, true);
 444                 if (!$exif) {
 445                         return;
 446                 }
 447
 448                 $ort = $exif['IFD0']['Orientation'];
 449
 450                 switch ($ort) {
 451                         case 1: // nothing
 452                                 break;
 453
 454                         case 2: // horizontal flip
 455                                 $this->flip();
 456                                 break;
 457
 458                         case 3: // 180 rotate left
 459                                 $this->rotate(180);
 460                                 break;
 461
 462                         case 4: // vertical flip
 463                                 $this->flip(false, true);
 464                                 break;
 465
 466                         case 5: // vertical flip + 90 rotate right
 467                                 $this->flip(false, true);
 468                                 $this->rotate(-90);
 469                                 break;
 470
 471                         case 6: // 90 rotate right
 472                                 $this->rotate(-90);
 473                                 break;
 474
 475                         case 7: // horizontal flip + 90 rotate right
 476                                 $this->flip();
 477                                 $this->rotate(-90);
 478                                 break;
 479
 480                         case 8: // 90 rotate left
 481                                 $this->rotate(90);
 482                                 break;
 483                 }
 484
 485                 //      logger('exif: ' . print_r($exif,true));
 486                 return $exif;
 487         }
 488
 489         /**
 490          * @param integer $min minimum dimension
 491          * @return mixed
 492          */
 493         public function scaleUp($min)
 494         {
 495                 if (!$this->isValid()) {
 496                         return false;
 497                 }
 498
 499                 $width = $this->getWidth();
 500                 $height = $this->getHeight();
 501
 502                 $dest_width = $dest_height = 0;
 503
 504                 if ((!$width)|| (!$height)) {
 505                         return false;
 506                 }
 507
 508                 if ($width < $min && $height < $min) {
 509                         if ($width > $height) {
 510                                 $dest_width = $min;
 511                                 $dest_height = intval(($height * $min) / $width);
 512                         } else {
 513                                 $dest_width = intval(($width * $min) / $height);
 514                                 $dest_height = $min;
 515                         }
 516                 } else {
 517                         if ($width < $min) {
 518                                 $dest_width = $min;
 519                                 $dest_height = intval(($height * $min) / $width);
 520                         } else {
 521                                 if ($height < $min) {
 522                                         $dest_width = intval(($width * $min) / $height);
 523                                         $dest_height = $min;
 524                                 } else {
 525                                         $dest_width = $width;
 526                                         $dest_height = $height;
 527                                 }
 528                         }
 529                 }
 530
 531                 return $this->scale($dest_width, $dest_height);
 532         }
 533
 534         /**
 535          * @param integer $dim dimension
 536          * @return mixed
 537          */
 538         public function scaleToSquare($dim)
 539         {
 540                 if (!$this->isValid()) {
 541                         return false;
 542                 }
 543
 544                 return $this->scale($dim, $dim);
 545         }
 546
 547         /**
 548          * @brief Scale image to target dimensions
 549          *
 550          * @param int $dest_width
 551          * @param int $dest_height
 552          * @return boolean
 553          */
 554         private function scale($dest_width, $dest_height)
 555         {
 556                 if (!$this->isValid()) {
 557                         return false;
 558                 }
 559
 560                 if ($this->isImagick()) {
 561                         /*
 562                          * If it is not animated, there will be only one iteration here,
 563                          * so don't bother checking
 564                          */
 565                         // Don't forget to go back to the first frame
 566                         $this->image->setFirstIterator();
 567                         do {
 568                                 // FIXME - implement horizontal bias for scaling as in following GD functions
 569                                 // to allow very tall images to be constrained only horizontally.
 570                                 $this->image->scaleImage($dest_width, $dest_height);
 571                         } while ($this->image->nextImage());
 572
 573                         // These may not be necessary anymore
 574                         $this->width  = $this->image->getImageWidth();
 575                         $this->height = $this->image->getImageHeight();
 576                 } else {
 577                         $dest = imagecreatetruecolor($dest_width, $dest_height);
 578                         imagealphablending($dest, false);
 579                         imagesavealpha($dest, true);
 580
 581                         if ($this->type=='image/png') {
 582                                 imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
 583                         }
 584
 585                         imagecopyresampled($dest, $this->image, 0, 0, 0, 0, $dest_width, $dest_height, $this->width, $this->height);
 586
 587                         if ($this->image) {
 588                                 imagedestroy($this->image);
 589                         }
 590
 591                         $this->image = $dest;
 592                         $this->width  = imagesx($this->image);
 593                         $this->height = imagesy($this->image);
 594                 }
 595
 596                 return true;
 597         }
 598
 599         /**
 600          * @param integer $max maximum
 601          * @param integer $x   x coordinate
 602          * @param integer $y   y coordinate
 603          * @param integer $w   width
 604          * @param integer $h   height
 605          * @return mixed
 606          */
 607         public function crop($max, $x, $y, $w, $h)
 608         {
 609                 if (!$this->isValid()) {
 610                         return false;
 611                 }
 612
 613                 if ($this->isImagick()) {
 614                         $this->image->setFirstIterator();
 615                         do {
 616                                 $this->image->cropImage($w, $h, $x, $y);
 617                                 /*
 618                                  * We need to remove the canva,
 619                                  * or the image is not resized to the crop:
 620                                  * http://php.net/manual/en/imagick.cropimage.php#97232
 621                                  */
 622                                 $this->image->setImagePage(0, 0, 0, 0);
 623                         } while ($this->image->nextImage());
 624                         return $this->scaleDown($max);
 625                 }
 626
 627                 $dest = imagecreatetruecolor($max, $max);
 628                 imagealphablending($dest, false);
 629                 imagesavealpha($dest, true);
 630                 if ($this->type=='image/png') {
 631                         imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
 632                 }
 633                 imagecopyresampled($dest, $this->image, 0, 0, $x, $y, $max, $max, $w, $h);
 634                 if ($this->image) {
 635                         imagedestroy($this->image);
 636                 }
 637                 $this->image = $dest;
 638                 $this->width  = imagesx($this->image);
 639                 $this->height = imagesy($this->image);
 640         }
 641
 642         /**
 643          * @param string $path file path
 644          * @return mixed
 645          */
 646         public function saveToFilePath($path)
 647         {
 648                 if (!$this->isValid()) {
 649                         return false;
 650                 }
 651
 652                 $string = $this->asString();
 653
 654                 $a = get_app();
 655
 656                 $stamp1 = microtime(true);
 657                 file_put_contents($path, $string);
 658                 $a->save_timestamp($stamp1, "file");
 659         }
 660
 661         /**
 662          * @brief Magic method allowing string casting of an Image object
 663          *
 664          * Ex: $data = $Image->asString();
 665          * can be replaced by
 666          * $data = (string) $Image;
 667          *
 668          * @return string
 669          */
 670         public function __toString() {
 671                 return $this->asString();
 672         }
 673
 674         /**
 675          * @return mixed
 676          */
 677         public function asString()
 678         {
 679                 if (!$this->isValid()) {
 680                         return false;
 681                 }
 682
 683                 if ($this->isImagick()) {
 684                         /* Clean it */
 685                         $this->image = $this->image->deconstructImages();
 686                         $string = $this->image->getImagesBlob();
 687                         return $string;
 688                 }
 689
 690                 $quality = false;
 691
 692                 ob_start();
 693
 694                 // Enable interlacing
 695                 imageinterlace($this->image, true);
 696
 697                 switch ($this->getType()) {
 698                         case "image/png":
 699                                 $quality = Config::get('system', 'png_quality');
 700                                 if ((!$quality) || ($quality > 9)) {
 701                                         $quality = PNG_QUALITY;
 702                                 }
 703                                 imagepng($this->image, null, $quality);
 704                                 break;
 705                         case "image/jpeg":
 706                                 $quality = Config::get('system', 'jpeg_quality');
 707                                 if ((!$quality) || ($quality > 100)) {
 708                                         $quality = JPEG_QUALITY;
 709                                 }
 710                                 imagejpeg($this->image, null, $quality);
 711                 }
 712                 $string = ob_get_contents();
 713                 ob_end_clean();
 714
 715                 return $string;
 716         }
 717
 718         /**
 719          * Guess image mimetype from filename or from Content-Type header
 720          *
 721          * @param string  $filename Image filename
 722          * @param boolean $fromcurl Check Content-Type header from curl request
 723          *
 724          * @return object
 725          */
 726         public static function guessType($filename, $fromcurl = false)
 727         {
 728                 logger('Image: guessType: '.$filename . ($fromcurl?' from curl headers':''), LOGGER_DEBUG);
 729                 $type = null;
 730                 if ($fromcurl) {
 731                         $a = get_app();
 732                         $headers=[];
 733                         $h = explode("\n", $a->get_curl_headers());
 734                         foreach ($h as $l) {
 735                                 $data = array_map("trim", explode(":", trim($l), 2));
 736                                 if (count($data) > 1) {
 737                                         list($k,$v) = $data;
 738                                         $headers[$k] = $v;
 739                                 }
 740                         }
 741                         if (array_key_exists('Content-Type', $headers))
 742                                 $type = $headers['Content-Type'];
 743                 }
 744                 if (is_null($type)) {
 745                         // Guessing from extension? Isn't that... dangerous?
 746                         if (class_exists('Imagick') && file_exists($filename) && is_readable($filename)) {
 747                                 /**
 748                                  * Well, this not much better,
 749                                  * but at least it comes from the data inside the image,
 750                                  * we won't be tricked by a manipulated extension
 751                                  */
 752                                 $image = new Imagick($filename);
 753                                 $type = $image->getImageMimeType();
 754                                 $image->setInterlaceScheme(Imagick::INTERLACE_PLANE);
 755                         } else {
 756                                 $ext = pathinfo($filename, PATHINFO_EXTENSION);
 757                                 $types = self::supportedTypes();
 758                                 $type = "image/jpeg";
 759                                 foreach ($types as $m => $e) {
 760                                         if ($ext == $e) {
 761                                                 $type = $m;
 762                                         }
 763                                 }
 764                         }
 765                 }
 766                 logger('Image: guessType: type='.$type, LOGGER_DEBUG);
 767                 return $type;
 768         }
 769
 770         /**
 771          * @param string $url url
 772          * @return object
 773          */
 774         public static function getInfoFromURL($url)
 775         {
 776                 $data = [];
 777
 778                 if (empty($url)) {
 779                         return $data;
 780                 }
 781
 782                 $data = Cache::get($url);
 783
 784                 if (is_null($data) || !$data || !is_array($data)) {
 785                         $img_str = Network::fetchUrl($url, true, $redirects, 4);
 786
 787                         if (!$img_str) {
 788                                 return false;
 789                         }
 790
 791                         $filesize = strlen($img_str);
 792
 793                         try {
 794                                 if (function_exists("getimagesizefromstring")) {
 795                                         $data = getimagesizefromstring($img_str);
 796                                 } else {
 797                                         $tempfile = tempnam(get_temppath(), "cache");
 798
 799                                         $a = get_app();
 800                                         $stamp1 = microtime(true);
 801                                         file_put_contents($tempfile, $img_str);
 802                                         $a->save_timestamp($stamp1, "file");
 803
 804                                         $data = getimagesize($tempfile);
 805                                         unlink($tempfile);
 806                                 }
 807                         } catch (Exception $e) {
 808                                 return false;
 809                         }
 810
 811                         if ($data) {
 812                                 $data["size"] = $filesize;
 813                         }
 814
 815                         Cache::set($url, $data);
 816                 }
 817
 818                 return $data;
 819         }
 820
 821         /**
 822          * @param integer $width  width
 823          * @param integer $height height
 824          * @param integer $max    max
 825          * @return array
 826          */
 827         public static function getScalingDimensions($width, $height, $max)
 828         {
 829                 $dest_width = $dest_height = 0;
 830
 831                 if ((!$width) || (!$height)) {
 832                         return false;
 833                 }
 834
 835                 if ($width > $max && $height > $max) {
 836                         // very tall image (greater than 16:9)
 837                         // constrain the width - let the height float.
 838
 839                         if ((($height * 9) / 16) > $width) {
 840                                 $dest_width = $max;
 841                                 $dest_height = intval(($height * $max) / $width);
 842                         } elseif ($width > $height) {
 843                                 // else constrain both dimensions
 844                                 $dest_width = $max;
 845                                 $dest_height = intval(($height * $max) / $width);
 846                         } else {
 847                                 $dest_width = intval(($width * $max) / $height);
 848                                 $dest_height = $max;
 849                         }
 850                 } else {
 851                         if ($width > $max) {
 852                                 $dest_width = $max;
 853                                 $dest_height = intval(($height * $max) / $width);
 854                         } else {
 855                                 if ($height > $max) {
 856                                         // very tall image (greater than 16:9)
 857                                         // but width is OK - don't do anything
 858
 859                                         if ((($height * 9) / 16) > $width) {
 860                                                 $dest_width = $width;
 861                                                 $dest_height = $height;
 862                                         } else {
 863                                                 $dest_width = intval(($width * $max) / $height);
 864                                                 $dest_height = $max;
 865                                         }
 866                                 } else {
 867                                         $dest_width = $width;
 868                                         $dest_height = $height;
 869                                 }
 870                         }
 871                 }
 872                 return ["width" => $dest_width, "height" => $dest_height];
 873         }
 874
 875         /**
 876          * @brief This function is used by the fromgplus addon
 877          * @param object  $a         App
 878          * @param integer $uid       user id
 879          * @param string  $imagedata optional, default empty
 880          * @param string  $url       optional, default empty
 881          * @return array
 882          */
 883         public static function storePhoto(App $a, $uid, $imagedata = "", $url = "")
 884         {
 885                 $r = q(
 886                         "SELECT `user`.`nickname`, `user`.`page-flags`, `contact`.`id` FROM `user` INNER JOIN `contact` on `user`.`uid` = `contact`.`uid`
 887                         WHERE `user`.`uid` = %d AND `user`.`blocked` = 0 AND `contact`.`self` = 1 LIMIT 1",
 888                         intval($uid)
 889                 );
 890
 891                 if (!DBA::isResult($r)) {
 892                         logger("Can't detect user data for uid ".$uid, LOGGER_DEBUG);
 893                         return([]);
 894                 }
 895
 896                 $page_owner_nick  = $r[0]['nickname'];
 897
 898                 /// @TODO
 899                 /// $default_cid      = $r[0]['id'];
 900                 /// $community_page   = (($r[0]['page-flags'] == Contact::PAGE_COMMUNITY) ? true : false);
 901
 902                 if ((strlen($imagedata) == 0) && ($url == "")) {
 903                         logger("No image data and no url provided", LOGGER_DEBUG);
 904                         return([]);
 905                 } elseif (strlen($imagedata) == 0) {
 906                         logger("Uploading picture from ".$url, LOGGER_DEBUG);
 907
 908                         $stamp1 = microtime(true);
 909                         $imagedata = @file_get_contents($url);
 910                         $a->save_timestamp($stamp1, "file");
 911                 }
 912
 913                 $maximagesize = Config::get('system', 'maximagesize');
 914
 915                 if (($maximagesize) && (strlen($imagedata) > $maximagesize)) {
 916                         logger("Image exceeds size limit of ".$maximagesize, LOGGER_DEBUG);
 917                         return([]);
 918                 }
 919
 920                 $tempfile = tempnam(get_temppath(), "cache");
 921
 922                 $stamp1 = microtime(true);
 923                 file_put_contents($tempfile, $imagedata);
 924                 $a->save_timestamp($stamp1, "file");
 925
 926                 $data = getimagesize($tempfile);
 927
 928                 if (!isset($data["mime"])) {
 929                         unlink($tempfile);
 930                         logger("File is no picture", LOGGER_DEBUG);
 931                         return([]);
 932                 }
 933
 934                 $Image = new Image($imagedata, $data["mime"]);
 935
 936                 if (!$Image->isValid()) {
 937                         unlink($tempfile);
 938                         logger("Picture is no valid picture", LOGGER_DEBUG);
 939                         return([]);
 940                 }
 941
 942                 $Image->orient($tempfile);
 943                 unlink($tempfile);
 944
 945                 $max_length = Config::get('system', 'max_image_length');
 946                 if (! $max_length) {
 947                         $max_length = MAX_IMAGE_LENGTH;
 948                 }
 949
 950                 if ($max_length > 0) {
 951                         $Image->scaleDown($max_length);
 952                 }
 953
 954                 $width = $Image->getWidth();
 955                 $height = $Image->getHeight();
 956
 957                 $hash = Photo::newResource();
 958
 959                 $smallest = 0;
 960
 961                 // Pictures are always public by now
 962                 //$defperm = '<'.$default_cid.'>';
 963                 $defperm = "";
 964                 $visitor = 0;
 965
 966                 $r = Photo::store($Image, $uid, $visitor, $hash, $tempfile, L10n::t('Wall Photos'), 0, 0, $defperm);
 967
 968                 if (!$r) {
 969                         logger("Picture couldn't be stored", LOGGER_DEBUG);
 970                         return([]);
 971                 }
 972
 973                 $image = ["page" => System::baseUrl().'/photos/'.$page_owner_nick.'/image/'.$hash,
 974                         "full" => System::baseUrl()."/photo/{$hash}-0.".$Image->getExt()];
 975
 976                 if ($width > 800 || $height > 800) {
 977                         $image["large"] = System::baseUrl()."/photo/{$hash}-0.".$Image->getExt();
 978                 }
 979
 980                 if ($width > 640 || $height > 640) {
 981                         $Image->scaleDown(640);
 982                         $r = Photo::store($Image, $uid, $visitor, $hash, $tempfile, L10n::t('Wall Photos'), 1, 0, $defperm);
 983                         if ($r) {
 984                                 $image["medium"] = System::baseUrl()."/photo/{$hash}-1.".$Image->getExt();
 985                         }
 986                 }
 987
 988                 if ($width > 320 || $height > 320) {
 989                         $Image->scaleDown(320);
 990                         $r = Photo::store($Image, $uid, $visitor, $hash, $tempfile, L10n::t('Wall Photos'), 2, 0, $defperm);
 991                         if ($r) {
 992                                 $image["small"] = System::baseUrl()."/photo/{$hash}-2.".$Image->getExt();
 993                         }
 994                 }
 995
 996                 if ($width > 160 && $height > 160) {
 997                         $x = 0;
 998                         $y = 0;
 999
1000                         $min = $Image->getWidth();
1001                         if ($min > 160) {
1002                                 $x = ($min - 160) / 2;
1003                         }
1004
1005                         if ($Image->getHeight() < $min) {
1006                                 $min = $Image->getHeight();
1007                                 if ($min > 160) {
1008                                         $y = ($min - 160) / 2;
1009                                 }
1010                         }
1011
1012                         $min = 160;
1013                         $Image->crop(160, $x, $y, $min, $min);
1014
1015                         $r = Photo::store($Image, $uid, $visitor, $hash, $tempfile, L10n::t('Wall Photos'), 3, 0, $defperm);
1016                         if ($r) {
1017                                 $image["thumb"] = System::baseUrl()."/photo/{$hash}-3.".$Image->getExt();
1018                         }
1019                 }
1020
1021                 // Set the full image as preview image. This will be overwritten, if the picture is larger than 640.
1022                 $image["preview"] = $image["full"];
1023
1024                 // Deactivated, since that would result in a cropped preview, if the picture wasn't larger than 320
1025                 //if (isset($image["thumb"]))
1026                 //  $image["preview"] = $image["thumb"];
1027
1028                 // Unsure, if this should be activated or deactivated
1029                 //if (isset($image["small"]))
1030                 //  $image["preview"] = $image["small"];
1031
1032                 if (isset($image["medium"])) {
1033                         $image["preview"] = $image["medium"];
1034                 }
1035
1036                 return($image);
1037         }
1038 }