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\Logger;
  13 use Friendica\Core\System;
  14 use Friendica\Database\DBA;
  15 use Friendica\Model\Contact;
  16 use Friendica\Model\Photo;
  17 use Friendica\Util\Network;
  18 use Exception;
  19 use Imagick;
  20 use ImagickPixel;
  21
  22 /**
  23  * Class to handle images
  24  */
  25 class Image
  26 {
  27         private $image;
  28
  29         /*
  30          * Put back gd stuff, not everybody have Imagick
  31          */
  32         private $imagick;
  33         private $width;
  34         private $height;
  35         private $valid;
  36         private $type;
  37         private $types;
  38
  39         /**
  40          * @brief supported mimetypes and corresponding file extensions
  41          * @return array
  42          */
  43         public static function supportedTypes()
  44         {
  45                 if (class_exists('Imagick')) {
  46                         // Imagick::queryFormats won't help us a lot there...
  47                         // At least, not yet, other parts of friendica uses this array
  48                         $t = [
  49                                 'image/jpeg' => 'jpg',
  50                                 'image/png' => 'png',
  51                                 'image/gif' => 'gif'
  52                         ];
  53                 } else {
  54                         $t = [];
  55                         $t['image/jpeg'] ='jpg';
  56                         if (imagetypes() & IMG_PNG) {
  57                                 $t['image/png'] = 'png';
  58                         }
  59                 }
  60
  61                 return $t;
  62         }
  63
  64         /**
  65          * @brief Constructor
  66          * @param object  $data data
  67          * @param boolean $type optional, default null
  68          * @return object
  69          */
  70         public function __construct($data, $type = null)
  71         {
  72                 $this->imagick = class_exists('Imagick');
  73                 $this->types = static::supportedTypes();
  74                 if (!array_key_exists($type, $this->types)) {
  75                         $type='image/jpeg';
  76                 }
  77                 $this->type = $type;
  78
  79                 if ($this->isImagick() && $this->loadData($data)) {
  80                         return true;
  81                 } else {
  82                         // Failed to load with Imagick, fallback
  83                         $this->imagick = false;
  84                 }
  85                 return $this->loadData($data);
  86         }
  87
  88         /**
  89          * @brief Destructor
  90          * @return void
  91          */
  92         public function __destruct()
  93         {
  94                 if ($this->image) {
  95                         if ($this->isImagick()) {
  96                                 $this->image->clear();
  97                                 $this->image->destroy();
  98                                 return;
  99                         }
 100                         if (is_resource($this->image)) {
 101                                 imagedestroy($this->image);
 102                         }
 103                 }
 104         }
 105
 106         /**
 107          * @return boolean
 108          */
 109         public function isImagick()
 110         {
 111                 return $this->imagick;
 112         }
 113
 114         /**
 115          * @brief Maps Mime types to Imagick formats
 116          * @return array With with image formats (mime type as key)
 117          */
 118         public static function getFormatsMap()
 119         {
 120                 $m = [
 121                         'image/jpeg' => 'JPG',
 122                         'image/png' => 'PNG',
 123                         'image/gif' => 'GIF'
 124                 ];
 125                 return $m;
 126         }
 127
 128         /**
 129          * @param object $data data
 130          * @return boolean
 131          */
 132         private function loadData($data)
 133         {
 134                 if ($this->isImagick()) {
 135                         $this->image = new Imagick();
 136                         try {
 137                                 $this->image->readImageBlob($data);
 138                         } catch (Exception $e) {
 139                                 // Imagick couldn't use the data
 140                                 return false;
 141                         }
 142
 143                         /*
 144                          * Setup the image to the format it will be saved to
 145                          */
 146                         $map = self::getFormatsMap();
 147                         $format = $map[$this->type];
 148                         $this->image->setFormat($format);
 149
 150                         // Always coalesce, if it is not a multi-frame image it won't hurt anyway
 151                         $this->image = $this->image->coalesceImages();
 152
 153                         /*
 154                          * setup the compression here, so we'll do it only once
 155                          */
 156                         switch ($this->getType()) {
 157                                 case "image/png":
 158                                         $quality = Config::get('system', 'png_quality');
 159                                         if ((! $quality) || ($quality > 9)) {
 160                                                 $quality = PNG_QUALITY;
 161                                         }
 162                                         /*
 163                                          * From http://www.imagemagick.org/script/command-line-options.php#quality:
 164                                          *
 165                                          * 'For the MNG and PNG image formats, the quality value sets
 166                                          * the zlib compression level (quality / 10) and filter-type (quality % 10).
 167                                          * The default PNG "quality" is 75, which means compression level 7 with adaptive PNG filtering,
 168                                          * unless the image has a color map, in which case it means compression level 7 with no PNG filtering'
 169                                          */
 170                                         $quality = $quality * 10;
 171                                         $this->image->setCompressionQuality($quality);
 172                                         break;
 173                                 case "image/jpeg":
 174                                         $quality = Config::get('system', 'jpeg_quality');
 175                                         if ((! $quality) || ($quality > 100)) {
 176                                                 $quality = JPEG_QUALITY;
 177                                         }
 178                                         $this->image->setCompressionQuality($quality);
 179                         }
 180
 181                         // The 'width' and 'height' properties are only used by non-Imagick routines.
 182                         $this->width  = $this->image->getImageWidth();
 183                         $this->height = $this->image->getImageHeight();
 184                         $this->valid  = true;
 185
 186                         return true;
 187                 }
 188
 189                 $this->valid = false;
 190                 $this->image = @imagecreatefromstring($data);
 191                 if ($this->image !== false) {
 192                         $this->width  = imagesx($this->image);
 193                         $this->height = imagesy($this->image);
 194                         $this->valid  = true;
 195                         imagealphablending($this->image, false);
 196                         imagesavealpha($this->image, true);
 197
 198                         return true;
 199                 }
 200
 201                 return false;
 202         }
 203
 204         /**
 205          * @return boolean
 206          */
 207         public function isValid()
 208         {
 209                 if ($this->isImagick()) {
 210                         return ($this->image !== false);
 211                 }
 212                 return $this->valid;
 213         }
 214
 215         /**
 216          * @return mixed
 217          */
 218         public function getWidth()
 219         {
 220                 if (!$this->isValid()) {
 221                         return false;
 222                 }
 223
 224                 if ($this->isImagick()) {
 225                         return $this->image->getImageWidth();
 226                 }
 227                 return $this->width;
 228         }
 229
 230         /**
 231          * @return mixed
 232          */
 233         public function getHeight()
 234         {
 235                 if (!$this->isValid()) {
 236                         return false;
 237                 }
 238
 239                 if ($this->isImagick()) {
 240                         return $this->image->getImageHeight();
 241                 }
 242                 return $this->height;
 243         }
 244
 245         /**
 246          * @return mixed
 247          */
 248         public function getImage()
 249         {
 250                 if (!$this->isValid()) {
 251                         return false;
 252                 }
 253
 254                 if ($this->isImagick()) {
 255                         /* Clean it */
 256                         $this->image = $this->image->deconstructImages();
 257                         return $this->image;
 258                 }
 259                 return $this->image;
 260         }
 261
 262         /**
 263          * @return mixed
 264          */
 265         public function getType()
 266         {
 267                 if (!$this->isValid()) {
 268                         return false;
 269                 }
 270
 271                 return $this->type;
 272         }
 273
 274         /**
 275          * @return mixed
 276          */
 277         public function getExt()
 278         {
 279                 if (!$this->isValid()) {
 280                         return false;
 281                 }
 282
 283                 return $this->types[$this->getType()];
 284         }
 285
 286         /**
 287          * @param integer $max max dimension
 288          * @return mixed
 289          */
 290         public function scaleDown($max)
 291         {
 292                 if (!$this->isValid()) {
 293                         return false;
 294                 }
 295
 296                 $width = $this->getWidth();
 297                 $height = $this->getHeight();
 298
 299                 $dest_width = $dest_height = 0;
 300
 301                 if ((! $width)|| (! $height)) {
 302                         return false;
 303                 }
 304
 305                 if ($width > $max && $height > $max) {
 306                         // very tall image (greater than 16:9)
 307                         // constrain the width - let the height float.
 308
 309                         if ((($height * 9) / 16) > $width) {
 310                                 $dest_width = $max;
 311                                 $dest_height = intval(($height * $max) / $width);
 312                         } elseif ($width > $height) {
 313                                 // else constrain both dimensions
 314                                 $dest_width = $max;
 315                                 $dest_height = intval(($height * $max) / $width);
 316                         } else {
 317                                 $dest_width = intval(($width * $max) / $height);
 318                                 $dest_height = $max;
 319                         }
 320                 } else {
 321                         if ($width > $max) {
 322                                 $dest_width = $max;
 323                                 $dest_height = intval(($height * $max) / $width);
 324                         } else {
 325                                 if ($height > $max) {
 326                                         // very tall image (greater than 16:9)
 327                                         // but width is OK - don't do anything
 328
 329                                         if ((($height * 9) / 16) > $width) {
 330                                                 $dest_width = $width;
 331                                                 $dest_height = $height;
 332                                         } else {
 333                                                 $dest_width = intval(($width * $max) / $height);
 334                                                 $dest_height = $max;
 335                                         }
 336                                 } else {
 337                                         $dest_width = $width;
 338                                         $dest_height = $height;
 339                                 }
 340                         }
 341                 }
 342
 343                 return $this->scale($dest_width, $dest_height);
 344         }
 345
 346         /**
 347          * @param integer $degrees degrees to rotate image
 348          * @return mixed
 349          */
 350         public function rotate($degrees)
 351         {
 352                 if (!$this->isValid()) {
 353                         return false;
 354                 }
 355
 356                 if ($this->isImagick()) {
 357                         $this->image->setFirstIterator();
 358                         do {
 359                                 $this->image->rotateImage(new ImagickPixel(), -$degrees); // ImageMagick rotates in the opposite direction of imagerotate()
 360                         } while ($this->image->nextImage());
 361                         return;
 362                 }
 363
 364                 // if script dies at this point check memory_limit setting in php.ini
 365                 $this->image  = imagerotate($this->image, $degrees, 0);
 366                 $this->width  = imagesx($this->image);
 367                 $this->height = imagesy($this->image);
 368         }
 369
 370         /**
 371          * @param boolean $horiz optional, default true
 372          * @param boolean $vert  optional, default false
 373          * @return mixed
 374          */
 375         public function flip($horiz = true, $vert = false)
 376         {
 377                 if (!$this->isValid()) {
 378                         return false;
 379                 }
 380
 381                 if ($this->isImagick()) {
 382                         $this->image->setFirstIterator();
 383                         do {
 384                                 if ($horiz) {
 385                                         $this->image->flipImage();
 386                                 }
 387                                 if ($vert) {
 388                                         $this->image->flopImage();
 389                                 }
 390                         } while ($this->image->nextImage());
 391                         return;
 392                 }
 393
 394                 $w = imagesx($this->image);
 395                 $h = imagesy($this->image);
 396                 $flipped = imagecreate($w, $h);
 397                 if ($horiz) {
 398                         for ($x = 0; $x < $w; $x++) {
 399                                 imagecopy($flipped, $this->image, $x, 0, $w - $x - 1, 0, 1, $h);
 400                         }
 401                 }
 402                 if ($vert) {
 403                         for ($y = 0; $y < $h; $y++) {
 404                                 imagecopy($flipped, $this->image, 0, $y, 0, $h - $y - 1, $w, 1);
 405                         }
 406                 }
 407                 $this->image = $flipped;
 408         }
 409
 410         /**
 411          * @param string $filename filename
 412          * @return mixed
 413          */
 414         public function orient($filename)
 415         {
 416                 if ($this->isImagick()) {
 417                         // based off comment on http://php.net/manual/en/imagick.getimageorientation.php
 418                         $orientation = $this->image->getImageOrientation();
 419                         switch ($orientation) {
 420                                 case Imagick::ORIENTATION_BOTTOMRIGHT:
 421                                         $this->image->rotateimage("#000", 180);
 422                                         break;
 423                                 case Imagick::ORIENTATION_RIGHTTOP:
 424                                         $this->image->rotateimage("#000", 90);
 425                                         break;
 426                                 case Imagick::ORIENTATION_LEFTBOTTOM:
 427                                         $this->image->rotateimage("#000", -90);
 428                                         break;
 429                         }
 430
 431                         $this->image->setImageOrientation(Imagick::ORIENTATION_TOPLEFT);
 432                         return true;
 433                 }
 434                 // based off comment on http://php.net/manual/en/function.imagerotate.php
 435
 436                 if (!$this->isValid()) {
 437                         return false;
 438                 }
 439
 440                 if ((!function_exists('exif_read_data')) || ($this->getType() !== 'image/jpeg')) {
 441                         return;
 442                 }
 443
 444                 $exif = @exif_read_data($filename, null, true);
 445                 if (!$exif) {
 446                         return;
 447                 }
 448
 449                 $ort = $exif['IFD0']['Orientation'];
 450
 451                 switch ($ort) {
 452                         case 1: // nothing
 453                                 break;
 454
 455                         case 2: // horizontal flip
 456                                 $this->flip();
 457                                 break;
 458
 459                         case 3: // 180 rotate left
 460                                 $this->rotate(180);
 461                                 break;
 462
 463                         case 4: // vertical flip
 464                                 $this->flip(false, true);
 465                                 break;
 466
 467                         case 5: // vertical flip + 90 rotate right
 468                                 $this->flip(false, true);
 469                                 $this->rotate(-90);
 470                                 break;
 471
 472                         case 6: // 90 rotate right
 473                                 $this->rotate(-90);
 474                                 break;
 475
 476                         case 7: // horizontal flip + 90 rotate right
 477                                 $this->flip();
 478                                 $this->rotate(-90);
 479                                 break;
 480
 481                         case 8: // 90 rotate left
 482                                 $this->rotate(90);
 483                                 break;
 484                 }
 485
 486                 //      Logger::log('exif: ' . print_r($exif,true));
 487                 return $exif;
 488         }
 489
 490         /**
 491          * @param integer $min minimum dimension
 492          * @return mixed
 493          */
 494         public function scaleUp($min)
 495         {
 496                 if (!$this->isValid()) {
 497                         return false;
 498                 }
 499
 500                 $width = $this->getWidth();
 501                 $height = $this->getHeight();
 502
 503                 $dest_width = $dest_height = 0;
 504
 505                 if ((!$width)|| (!$height)) {
 506                         return false;
 507                 }
 508
 509                 if ($width < $min && $height < $min) {
 510                         if ($width > $height) {
 511                                 $dest_width = $min;
 512                                 $dest_height = intval(($height * $min) / $width);
 513                         } else {
 514                                 $dest_width = intval(($width * $min) / $height);
 515                                 $dest_height = $min;
 516                         }
 517                 } else {
 518                         if ($width < $min) {
 519                                 $dest_width = $min;
 520                                 $dest_height = intval(($height * $min) / $width);
 521                         } else {
 522                                 if ($height < $min) {
 523                                         $dest_width = intval(($width * $min) / $height);
 524                                         $dest_height = $min;
 525                                 } else {
 526                                         $dest_width = $width;
 527                                         $dest_height = $height;
 528                                 }
 529                         }
 530                 }
 531
 532                 return $this->scale($dest_width, $dest_height);
 533         }
 534
 535         /**
 536          * @param integer $dim dimension
 537          * @return mixed
 538          */
 539         public function scaleToSquare($dim)
 540         {
 541                 if (!$this->isValid()) {
 542                         return false;
 543                 }
 544
 545                 return $this->scale($dim, $dim);
 546         }
 547
 548         /**
 549          * @brief Scale image to target dimensions
 550          *
 551          * @param int $dest_width
 552          * @param int $dest_height
 553          * @return boolean
 554          */
 555         private function scale($dest_width, $dest_height)
 556         {
 557                 if (!$this->isValid()) {
 558                         return false;
 559                 }
 560
 561                 if ($this->isImagick()) {
 562                         /*
 563                          * If it is not animated, there will be only one iteration here,
 564                          * so don't bother checking
 565                          */
 566                         // Don't forget to go back to the first frame
 567                         $this->image->setFirstIterator();
 568                         do {
 569                                 // FIXME - implement horizontal bias for scaling as in following GD functions
 570                                 // to allow very tall images to be constrained only horizontally.
 571                                 $this->image->scaleImage($dest_width, $dest_height);
 572                         } while ($this->image->nextImage());
 573
 574                         // These may not be necessary anymore
 575                         $this->width  = $this->image->getImageWidth();
 576                         $this->height = $this->image->getImageHeight();
 577                 } else {
 578                         $dest = imagecreatetruecolor($dest_width, $dest_height);
 579                         imagealphablending($dest, false);
 580                         imagesavealpha($dest, true);
 581
 582                         if ($this->type=='image/png') {
 583                                 imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
 584                         }
 585
 586                         imagecopyresampled($dest, $this->image, 0, 0, 0, 0, $dest_width, $dest_height, $this->width, $this->height);
 587
 588                         if ($this->image) {
 589                                 imagedestroy($this->image);
 590                         }
 591
 592                         $this->image = $dest;
 593                         $this->width  = imagesx($this->image);
 594                         $this->height = imagesy($this->image);
 595                 }
 596
 597                 return true;
 598         }
 599
 600         /**
 601          * @param integer $max maximum
 602          * @param integer $x   x coordinate
 603          * @param integer $y   y coordinate
 604          * @param integer $w   width
 605          * @param integer $h   height
 606          * @return mixed
 607          */
 608         public function crop($max, $x, $y, $w, $h)
 609         {
 610                 if (!$this->isValid()) {
 611                         return false;
 612                 }
 613
 614                 if ($this->isImagick()) {
 615                         $this->image->setFirstIterator();
 616                         do {
 617                                 $this->image->cropImage($w, $h, $x, $y);
 618                                 /*
 619                                  * We need to remove the canva,
 620                                  * or the image is not resized to the crop:
 621                                  * http://php.net/manual/en/imagick.cropimage.php#97232
 622                                  */
 623                                 $this->image->setImagePage(0, 0, 0, 0);
 624                         } while ($this->image->nextImage());
 625                         return $this->scaleDown($max);
 626                 }
 627
 628                 $dest = imagecreatetruecolor($max, $max);
 629                 imagealphablending($dest, false);
 630                 imagesavealpha($dest, true);
 631                 if ($this->type=='image/png') {
 632                         imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
 633                 }
 634                 imagecopyresampled($dest, $this->image, 0, 0, $x, $y, $max, $max, $w, $h);
 635                 if ($this->image) {
 636                         imagedestroy($this->image);
 637                 }
 638                 $this->image = $dest;
 639                 $this->width  = imagesx($this->image);
 640                 $this->height = imagesy($this->image);
 641         }
 642
 643         /**
 644          * @param string $path file path
 645          * @return mixed
 646          */
 647         public function saveToFilePath($path)
 648         {
 649                 if (!$this->isValid()) {
 650                         return false;
 651                 }
 652
 653                 $string = $this->asString();
 654
 655                 $a = \get_app();
 656
 657                 $stamp1 = microtime(true);
 658                 file_put_contents($path, $string);
 659                 $a->saveTimestamp($stamp1, "file");
 660         }
 661
 662         /**
 663          * @brief Magic method allowing string casting of an Image object
 664          *
 665          * Ex: $data = $Image->asString();
 666          * can be replaced by
 667          * $data = (string) $Image;
 668          *
 669          * @return string
 670          */
 671         public function __toString() {
 672                 return $this->asString();
 673         }
 674
 675         /**
 676          * @return mixed
 677          */
 678         public function asString()
 679         {
 680                 if (!$this->isValid()) {
 681                         return false;
 682                 }
 683
 684                 if ($this->isImagick()) {
 685                         /* Clean it */
 686                         $this->image = $this->image->deconstructImages();
 687                         $string = $this->image->getImagesBlob();
 688                         return $string;
 689                 }
 690
 691                 $quality = false;
 692
 693                 ob_start();
 694
 695                 // Enable interlacing
 696                 imageinterlace($this->image, true);
 697
 698                 switch ($this->getType()) {
 699                         case "image/png":
 700                                 $quality = Config::get('system', 'png_quality');
 701                                 if ((!$quality) || ($quality > 9)) {
 702                                         $quality = PNG_QUALITY;
 703                                 }
 704                                 imagepng($this->image, null, $quality);
 705                                 break;
 706                         case "image/jpeg":
 707                                 $quality = Config::get('system', 'jpeg_quality');
 708                                 if ((!$quality) || ($quality > 100)) {
 709                                         $quality = JPEG_QUALITY;
 710                                 }
 711                                 imagejpeg($this->image, null, $quality);
 712                 }
 713                 $string = ob_get_contents();
 714                 ob_end_clean();
 715
 716                 return $string;
 717         }
 718
 719         /**
 720          * Guess image mimetype from filename or from Content-Type header
 721          *
 722          * @param string  $filename Image filename
 723          * @param boolean $fromcurl Check Content-Type header from curl request
 724          * @param string $header passed headers to take into account
 725          *
 726          * @return object
 727          */
 728         public static function guessType($filename, $fromcurl = false, $header = '')
 729         {
 730                 Logger::log('Image: guessType: '.$filename . ($fromcurl?' from curl headers':''), Logger::DEBUG);
 731                 $type = null;
 732                 if ($fromcurl) {
 733                         $a = \get_app();
 734                         $headers=[];
 735                         $h = explode("\n", $header);
 736                         foreach ($h as $l) {
 737                                 $data = array_map("trim", explode(":", trim($l), 2));
 738                                 if (count($data) > 1) {
 739                                         list($k,$v) = $data;
 740                                         $headers[$k] = $v;
 741                                 }
 742                         }
 743                         if (array_key_exists('Content-Type', $headers))
 744                                 $type = $headers['Content-Type'];
 745                 }
 746                 if (is_null($type)) {
 747                         // Guessing from extension? Isn't that... dangerous?
 748                         if (class_exists('Imagick') && file_exists($filename) && is_readable($filename)) {
 749                                 /**
 750                                  * Well, this not much better,
 751                                  * but at least it comes from the data inside the image,
 752                                  * we won't be tricked by a manipulated extension
 753                                  */
 754                                 $image = new Imagick($filename);
 755                                 $type = $image->getImageMimeType();
 756                                 $image->setInterlaceScheme(Imagick::INTERLACE_PLANE);
 757                         } else {
 758                                 $ext = pathinfo($filename, PATHINFO_EXTENSION);
 759                                 $types = self::supportedTypes();
 760                                 $type = "image/jpeg";
 761                                 foreach ($types as $m => $e) {
 762                                         if ($ext == $e) {
 763                                                 $type = $m;
 764                                         }
 765                                 }
 766                         }
 767                 }
 768                 Logger::log('Image: guessType: type='.$type, Logger::DEBUG);
 769                 return $type;
 770         }
 771
 772         /**
 773          * @param string $url url
 774          * @return object
 775          */
 776         public static function getInfoFromURL($url)
 777         {
 778                 $data = [];
 779
 780                 if (empty($url)) {
 781                         return $data;
 782                 }
 783
 784                 $data = Cache::get($url);
 785
 786                 if (is_null($data) || !$data || !is_array($data)) {
 787                         $img_str = Network::fetchUrl($url, true, $redirects, 4);
 788
 789                         if (!$img_str) {
 790                                 return false;
 791                         }
 792
 793                         $filesize = strlen($img_str);
 794
 795                         try {
 796                                 if (function_exists("getimagesizefromstring")) {
 797                                         $data = @getimagesizefromstring($img_str);
 798                                 } else {
 799                                         $tempfile = tempnam(get_temppath(), "cache");
 800
 801                                         $a = \get_app();
 802                                         $stamp1 = microtime(true);
 803                                         file_put_contents($tempfile, $img_str);
 804                                         $a->saveTimestamp($stamp1, "file");
 805
 806                                         $data = getimagesize($tempfile);
 807                                         unlink($tempfile);
 808                                 }
 809                         } catch (Exception $e) {
 810                                 return false;
 811                         }
 812
 813                         if ($data) {
 814                                 $data["size"] = $filesize;
 815                         }
 816
 817                         Cache::set($url, $data);
 818                 }
 819
 820                 return $data;
 821         }
 822
 823         /**
 824          * @param integer $width  width
 825          * @param integer $height height
 826          * @param integer $max    max
 827          * @return array
 828          */
 829         public static function getScalingDimensions($width, $height, $max)
 830         {
 831                 $dest_width = $dest_height = 0;
 832
 833                 if ((!$width) || (!$height)) {
 834                         return false;
 835                 }
 836
 837                 if ($width > $max && $height > $max) {
 838                         // very tall image (greater than 16:9)
 839                         // constrain the width - let the height float.
 840
 841                         if ((($height * 9) / 16) > $width) {
 842                                 $dest_width = $max;
 843                                 $dest_height = intval(($height * $max) / $width);
 844                         } elseif ($width > $height) {
 845                                 // else constrain both dimensions
 846                                 $dest_width = $max;
 847                                 $dest_height = intval(($height * $max) / $width);
 848                         } else {
 849                                 $dest_width = intval(($width * $max) / $height);
 850                                 $dest_height = $max;
 851                         }
 852                 } else {
 853                         if ($width > $max) {
 854                                 $dest_width = $max;
 855                                 $dest_height = intval(($height * $max) / $width);
 856                         } else {
 857                                 if ($height > $max) {
 858                                         // very tall image (greater than 16:9)
 859                                         // but width is OK - don't do anything
 860
 861                                         if ((($height * 9) / 16) > $width) {
 862                                                 $dest_width = $width;
 863                                                 $dest_height = $height;
 864                                         } else {
 865                                                 $dest_width = intval(($width * $max) / $height);
 866                                                 $dest_height = $max;
 867                                         }
 868                                 } else {
 869                                         $dest_width = $width;
 870                                         $dest_height = $height;
 871                                 }
 872                         }
 873                 }
 874                 return ["width" => $dest_width, "height" => $dest_height];
 875         }
 876
 877         /**
 878          * @brief This function is used by the fromgplus addon
 879          * @param object  $a         App
 880          * @param integer $uid       user id
 881          * @param string  $imagedata optional, default empty
 882          * @param string  $url       optional, default empty
 883          * @return array
 884          */
 885         public static function storePhoto(App $a, $uid, $imagedata = "", $url = "")
 886         {
 887                 $r = q(
 888                         "SELECT `user`.`nickname`, `user`.`page-flags`, `contact`.`id` FROM `user` INNER JOIN `contact` on `user`.`uid` = `contact`.`uid`
 889                         WHERE `user`.`uid` = %d AND `user`.`blocked` = 0 AND `contact`.`self` = 1 LIMIT 1",
 890                         intval($uid)
 891                 );
 892
 893                 if (!DBA::isResult($r)) {
 894                         Logger::log("Can't detect user data for uid ".$uid, Logger::DEBUG);
 895                         return([]);
 896                 }
 897
 898                 $page_owner_nick  = $r[0]['nickname'];
 899
 900                 /// @TODO
 901                 /// $default_cid      = $r[0]['id'];
 902                 /// $community_page   = (($r[0]['page-flags'] == Contact::PAGE_COMMUNITY) ? true : false);
 903
 904                 if ((strlen($imagedata) == 0) && ($url == "")) {
 905                         Logger::log("No image data and no url provided", Logger::DEBUG);
 906                         return([]);
 907                 } elseif (strlen($imagedata) == 0) {
 908                         Logger::log("Uploading picture from ".$url, Logger::DEBUG);
 909
 910                         $stamp1 = microtime(true);
 911                         $imagedata = @file_get_contents($url);
 912                         $a->saveTimestamp($stamp1, "file");
 913                 }
 914
 915                 $maximagesize = Config::get('system', 'maximagesize');
 916
 917                 if (($maximagesize) && (strlen($imagedata) > $maximagesize)) {
 918                         Logger::log("Image exceeds size limit of ".$maximagesize, Logger::DEBUG);
 919                         return([]);
 920                 }
 921
 922                 $tempfile = tempnam(get_temppath(), "cache");
 923
 924                 $stamp1 = microtime(true);
 925                 file_put_contents($tempfile, $imagedata);
 926                 $a->saveTimestamp($stamp1, "file");
 927
 928                 $data = getimagesize($tempfile);
 929
 930                 if (!isset($data["mime"])) {
 931                         unlink($tempfile);
 932                         Logger::log("File is no picture", Logger::DEBUG);
 933                         return([]);
 934                 }
 935
 936                 $Image = new Image($imagedata, $data["mime"]);
 937
 938                 if (!$Image->isValid()) {
 939                         unlink($tempfile);
 940                         Logger::log("Picture is no valid picture", Logger::DEBUG);
 941                         return([]);
 942                 }
 943
 944                 $Image->orient($tempfile);
 945                 unlink($tempfile);
 946
 947                 $max_length = Config::get('system', 'max_image_length');
 948                 if (! $max_length) {
 949                         $max_length = MAX_IMAGE_LENGTH;
 950                 }
 951
 952                 if ($max_length > 0) {
 953                         $Image->scaleDown($max_length);
 954                 }
 955
 956                 $width = $Image->getWidth();
 957                 $height = $Image->getHeight();
 958
 959                 $hash = Photo::newResource();
 960
 961                 $smallest = 0;
 962
 963                 // Pictures are always public by now
 964                 //$defperm = '<'.$default_cid.'>';
 965                 $defperm = "";
 966                 $visitor = 0;
 967
 968                 $r = Photo::store($Image, $uid, $visitor, $hash, $tempfile, L10n::t('Wall Photos'), 0, 0, $defperm);
 969
 970                 if (!$r) {
 971                         Logger::log("Picture couldn't be stored", Logger::DEBUG);
 972                         return([]);
 973                 }
 974
 975                 $image = ["page" => System::baseUrl().'/photos/'.$page_owner_nick.'/image/'.$hash,
 976                         "full" => System::baseUrl()."/photo/{$hash}-0.".$Image->getExt()];
 977
 978                 if ($width > 800 || $height > 800) {
 979                         $image["large"] = System::baseUrl()."/photo/{$hash}-0.".$Image->getExt();
 980                 }
 981
 982                 if ($width > 640 || $height > 640) {
 983                         $Image->scaleDown(640);
 984                         $r = Photo::store($Image, $uid, $visitor, $hash, $tempfile, L10n::t('Wall Photos'), 1, 0, $defperm);
 985                         if ($r) {
 986                                 $image["medium"] = System::baseUrl()."/photo/{$hash}-1.".$Image->getExt();
 987                         }
 988                 }
 989
 990                 if ($width > 320 || $height > 320) {
 991                         $Image->scaleDown(320);
 992                         $r = Photo::store($Image, $uid, $visitor, $hash, $tempfile, L10n::t('Wall Photos'), 2, 0, $defperm);
 993                         if ($r) {
 994                                 $image["small"] = System::baseUrl()."/photo/{$hash}-2.".$Image->getExt();
 995                         }
 996                 }
 997
 998                 if ($width > 160 && $height > 160) {
 999                         $x = 0;
1000                         $y = 0;
1001
1002                         $min = $Image->getWidth();
1003                         if ($min > 160) {
1004                                 $x = ($min - 160) / 2;
1005                         }
1006
1007                         if ($Image->getHeight() < $min) {
1008                                 $min = $Image->getHeight();
1009                                 if ($min > 160) {
1010                                         $y = ($min - 160) / 2;
1011                                 }
1012                         }
1013
1014                         $min = 160;
1015                         $Image->crop(160, $x, $y, $min, $min);
1016
1017                         $r = Photo::store($Image, $uid, $visitor, $hash, $tempfile, L10n::t('Wall Photos'), 3, 0, $defperm);
1018                         if ($r) {
1019                                 $image["thumb"] = System::baseUrl()."/photo/{$hash}-3.".$Image->getExt();
1020                         }
1021                 }
1022
1023                 // Set the full image as preview image. This will be overwritten, if the picture is larger than 640.
1024                 $image["preview"] = $image["full"];
1025
1026                 // Deactivated, since that would result in a cropped preview, if the picture wasn't larger than 320
1027                 //if (isset($image["thumb"]))
1028                 //  $image["preview"] = $image["thumb"];
1029
1030                 // Unsure, if this should be activated or deactivated
1031                 //if (isset($image["small"]))
1032                 //  $image["preview"] = $image["small"];
1033
1034                 if (isset($image["medium"])) {
1035                         $image["preview"] = $image["medium"];
1036                 }
1037
1038                 return($image);
1039         }
1040 }