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