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