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