3 * StatusNet, the distributed open-source microblogging tool
5 * Abstraction for an image file
9 * LICENCE: This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Affero General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Affero General Public License for more details.
19 * You should have received a copy of the GNU Affero General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * @author Evan Prodromou <evan@status.net>
25 * @author Zach Copley <zach@status.net>
26 * @copyright 2008-2009 StatusNet, Inc.
27 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
28 * @link http://status.net/
31 if (!defined('GNUSOCIAL')) { exit(1); }
34 * A wrapper on uploaded files
36 * Makes it slightly easier to accept an image file from upload.
40 * @author Evan Prodromou <evan@status.net>
41 * @author Zach Copley <zach@status.net>
42 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
43 * @link http://status.net/
54 var $rotate=0; // degrees to rotate for properly oriented image (extrapolated from EXIF etc.)
55 var $animated = null; // Animated image? (has more than 1 frame). null means untested
56 var $mimetype = null; // The _ImageFile_ mimetype, _not_ the originating File object
58 protected $fileRecord = null;
60 function __construct($id, $filepath)
63 if (!empty($this->id)) {
64 $this->fileRecord = new File();
65 $this->fileRecord->id = $this->id;
66 if (!$this->fileRecord->find(true)) {
67 // If we have set an ID, we need that ID to exist!
68 throw new NoResultException($this->fileRecord);
72 // These do not have to be the same as fileRecord->filename for example,
73 // since we may have generated an image source file from something else!
74 $this->filepath = $filepath;
75 $this->filename = basename($filepath);
77 $info = @getimagesize($this->filepath);
80 ($info[2] == IMAGETYPE_GIF && !function_exists('imagecreatefromgif')) ||
81 ($info[2] == IMAGETYPE_JPEG && !function_exists('imagecreatefromjpeg')) ||
82 ($info[2] == IMAGETYPE_WBMP && !function_exists('imagecreatefromwbmp')) ||
83 ($info[2] == IMAGETYPE_XBM && !function_exists('imagecreatefromxbm')) ||
84 ($info[2] == IMAGETYPE_PNG && !function_exists('imagecreatefrompng'))) {
86 // TRANS: Exception thrown when trying to upload an unsupported image file format.
87 throw new UnsupportedMediaException(_('Unsupported image format.'), $this->filepath);
90 $this->width = $info[0];
91 $this->height = $info[1];
92 $this->type = $info[2];
93 $this->mimetype = $info['mime'];
95 if ($this->type == IMAGETYPE_JPEG && function_exists('exif_read_data')) {
96 // Orientation value to rotate thumbnails properly
97 $exif = exif_read_data($this->filepath);
98 if (is_array($exif) && isset($exif['Orientation'])) {
99 switch ((int)$exif['Orientation']) {
100 case 1: // top is top
103 case 3: // top is bottom
106 case 6: // top is right
109 case 8: // top is left
113 // If we ever write this back, Orientation should be set to '1'
115 } elseif ($this->type === IMAGETYPE_GIF) {
116 $this->animated = $this->isAnimatedGif();
119 Event::handle('FillImageFileMetadata', array($this));
122 public static function fromFileObject(File $file)
125 $media = common_get_mime_media($file->mimetype);
126 if (Event::handle('CreateFileImageThumbnailSource', array($file, &$imgPath, $media))) {
127 if (empty($file->filename) && !file_exists($imgPath)) {
128 throw new UnsupportedMediaException(_('File without filename could not get a thumbnail source.'));
131 // First some mimetype specific exceptions
132 switch ($file->mimetype) {
133 case 'image/svg+xml':
134 throw new UseFileAsThumbnailException($file->id);
137 // And we'll only consider it an image if it has such a media type
140 $imgPath = $file->getPath();
143 throw new UnsupportedMediaException(_('Unsupported media format.'), $file->getPath());
147 if (!file_exists($imgPath)) {
148 throw new ServerException(sprintf('Image not available locally: %s', $imgPath));
152 $image = new ImageFile($file->id, $imgPath);
153 } catch (UnsupportedMediaException $e) {
154 // Avoid deleting the original
155 if ($imgPath != $file->getPath()) {
163 public function getPath()
165 if (!file_exists($this->filepath)) {
166 throw new FileNotFoundException($this->filepath);
169 return $this->filepath;
172 static function fromUpload($param='upload')
174 switch ($_FILES[$param]['error']) {
175 case UPLOAD_ERR_OK: // success, jump out
178 case UPLOAD_ERR_INI_SIZE:
179 case UPLOAD_ERR_FORM_SIZE:
180 // TRANS: Exception thrown when too large a file is uploaded.
181 // TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
182 throw new Exception(sprintf(_('That file is too big. The maximum file size is %s.'), ImageFile::maxFileSize()));
184 case UPLOAD_ERR_PARTIAL:
185 @unlink($_FILES[$param]['tmp_name']);
186 // TRANS: Exception thrown when uploading an image and that action could not be completed.
187 throw new Exception(_('Partial upload.'));
189 case UPLOAD_ERR_NO_FILE:
190 // No file; probably just a non-AJAX submission.
191 throw new ClientException(_('No file uploaded.'));
194 common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " . $_FILES[$param]['error']);
195 // TRANS: Exception thrown when uploading an image fails for an unknown reason.
196 throw new Exception(_('System error uploading file.'));
199 $info = @getimagesize($_FILES[$param]['tmp_name']);
202 @unlink($_FILES[$param]['tmp_name']);
203 // TRANS: Exception thrown when uploading a file as image that is not an image or is a corrupt file.
204 throw new UnsupportedMediaException(_('Not an image or corrupt file.'), '[deleted]');
207 return new ImageFile(null, $_FILES[$param]['tmp_name']);
211 * Copy the image file to the given destination.
213 * This function may modify the resulting file. Please use the
214 * returned ImageFile object to read metadata (width, height etc.)
216 * @param string $outpath
217 * @return ImageFile the image stored at target path
219 function copyTo($outpath)
221 return new ImageFile(null, $this->resizeTo($outpath));
225 * Create and save a thumbnail image.
227 * @param string $outpath
228 * @param array $box width, height, boundary box (x,y,w,h) defaults to full image
229 * @return string full local filesystem filename
231 function resizeTo($outpath, array $box=array())
233 $box['width'] = isset($box['width']) ? intval($box['width']) : $this->width;
234 $box['height'] = isset($box['height']) ? intval($box['height']) : $this->height;
235 $box['x'] = isset($box['x']) ? intval($box['x']) : 0;
236 $box['y'] = isset($box['y']) ? intval($box['y']) : 0;
237 $box['w'] = isset($box['w']) ? intval($box['w']) : $this->width;
238 $box['h'] = isset($box['h']) ? intval($box['h']) : $this->height;
240 if (!file_exists($this->filepath)) {
241 // TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
242 throw new Exception(_('Lost our file.'));
245 // Don't rotate/crop/scale if it isn't necessary
246 if ($box['width'] === $this->width
247 && $box['height'] === $this->height
250 && $box['w'] === $this->width
251 && $box['h'] === $this->height
252 && $this->type == $this->preferredType()) {
253 if ($this->rotate == 0) {
254 // No rotational difference, just copy it as-is
255 @copy($this->filepath, $outpath);
257 } elseif (abs($this->rotate) == 90) {
258 // Box is rotated 90 degrees in either direction,
259 // so we have to redefine x to y and vice versa.
260 $tmp = $box['width'];
261 $box['width'] = $box['height'];
262 $box['height'] = $tmp;
264 $box['x'] = $box['y'];
267 $box['w'] = $box['h'];
273 if (Event::handle('StartResizeImageFile', array($this, $outpath, $box))) {
274 $this->resizeToFile($outpath, $box);
277 if (!file_exists($outpath)) {
278 throw new UseFileAsThumbnailException($this->id);
284 protected function resizeToFile($outpath, array $box)
286 switch ($this->type) {
288 $image_src = imagecreatefromgif($this->filepath);
291 $image_src = imagecreatefromjpeg($this->filepath);
294 $image_src = imagecreatefrompng($this->filepath);
297 $image_src = imagecreatefrombmp($this->filepath);
300 $image_src = imagecreatefromwbmp($this->filepath);
303 $image_src = imagecreatefromxbm($this->filepath);
306 // TRANS: Exception thrown when trying to resize an unknown file type.
307 throw new Exception(_('Unknown file type'));
310 if ($this->rotate != 0) {
311 $image_src = imagerotate($image_src, $this->rotate, 0);
314 $image_dest = imagecreatetruecolor($box['width'], $box['height']);
316 if ($this->type == IMAGETYPE_GIF || $this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
318 $transparent_idx = imagecolortransparent($image_src);
320 if ($transparent_idx >= 0) {
322 $transparent_color = imagecolorsforindex($image_src, $transparent_idx);
323 $transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
324 imagefill($image_dest, 0, 0, $transparent_idx);
325 imagecolortransparent($image_dest, $transparent_idx);
327 } elseif ($this->type == IMAGETYPE_PNG) {
329 imagealphablending($image_dest, false);
330 $transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
331 imagefill($image_dest, 0, 0, $transparent);
332 imagesavealpha($image_dest, true);
337 imagecopyresampled($image_dest, $image_src, 0, 0, $box['x'], $box['y'], $box['width'], $box['height'], $box['w'], $box['h']);
339 switch ($this->preferredType()) {
341 imagegif($image_dest, $outpath);
344 imagejpeg($image_dest, $outpath, common_config('image', 'jpegquality'));
347 imagepng($image_dest, $outpath);
350 // TRANS: Exception thrown when trying resize an unknown file type.
351 throw new Exception(_('Unknown file type'));
354 imagedestroy($image_src);
355 imagedestroy($image_dest);
360 * Several obscure file types should be normalized to PNG on resize.
362 * @fixme consider flattening anything not GIF or JPEG to PNG
365 function preferredType()
367 if($this->type == IMAGETYPE_BMP) {
368 //we don't want to save BMP... it's an inefficient, rare, antiquated format
370 return IMAGETYPE_PNG;
371 } else if($this->type == IMAGETYPE_WBMP) {
372 //we don't want to save WBMP... it's a rare format that we can't guarantee clients will support
374 return IMAGETYPE_PNG;
375 } else if($this->type == IMAGETYPE_XBM) {
376 //we don't want to save XBM... it's a rare format that we can't guarantee clients will support
378 return IMAGETYPE_PNG;
385 @unlink($this->filepath);
388 static function maxFileSize()
390 $value = ImageFile::maxFileSizeInt();
392 if ($value > 1024 * 1024) {
393 $value = $value/(1024*1024);
394 // TRANS: Number of megabytes. %d is the number.
395 return sprintf(_m('%dMB','%dMB',$value),$value);
396 } else if ($value > 1024) {
397 $value = $value/1024;
398 // TRANS: Number of kilobytes. %d is the number.
399 return sprintf(_m('%dkB','%dkB',$value),$value);
401 // TRANS: Number of bytes. %d is the number.
402 return sprintf(_m('%dB','%dB',$value),$value);
406 static function maxFileSizeInt()
408 return min(ImageFile::strToInt(ini_get('post_max_size')),
409 ImageFile::strToInt(ini_get('upload_max_filesize')),
410 ImageFile::strToInt(ini_get('memory_limit')));
413 static function strToInt($str)
415 $unit = substr($str, -1);
416 $num = substr($str, 0, -1);
418 switch(strtoupper($unit)){
430 public function scaleToFit($maxWidth=null, $maxHeight=null, $crop=null)
432 return self::getScalingValues($this->width, $this->height,
433 $maxWidth, $maxHeight, $crop, $this->rotate);
437 * Gets scaling values for images of various types. Cropping can be enabled.
439 * Values will scale _up_ to fit max values if cropping is enabled!
440 * With cropping disabled, the max value of each axis will be respected.
442 * @param $width int Original width
443 * @param $height int Original height
444 * @param $maxW int Resulting max width
445 * @param $maxH int Resulting max height
446 * @param $crop int Crop to the size (not preserving aspect ratio)
448 public static function getScalingValues($width, $height,
449 $maxW=null, $maxH=null,
450 $crop=null, $rotate=0)
452 $maxW = $maxW ?: common_config('thumbnail', 'width');
453 $maxH = $maxH ?: common_config('thumbnail', 'height');
455 if ($maxW < 1 || ($maxH !== null && $maxH < 1)) {
456 throw new ServerException('Bad parameters for ImageFile::getScalingValues');
457 } elseif ($maxH === null) {
458 // if maxH is null, we set maxH to equal maxW and enable crop
463 // Because GD doesn't understand EXIF orientation etc.
464 if (abs($rotate) == 90) {
470 // Cropping data (for original image size). Default values, 0 and null,
471 // imply no cropping and with preserved aspect ratio (per axis).
474 $cw = null; // crop area width
475 $ch = null; // crop area height
478 $s_ar = $width / $height;
479 $t_ar = $maxW / $maxH;
484 // Source aspect ratio differs from target, recalculate crop points!
486 $cx = floor($width / 2 - $height * $t_ar / 2);
487 $cw = ceil($height * $t_ar);
488 } elseif ($s_ar < $t_ar) {
489 $cy = floor($height / 2 - $width / $t_ar / 2);
490 $ch = ceil($width / $t_ar);
494 $rh = ceil($height * $rw / $width);
496 // Scaling caused too large height, decrease to max accepted value
499 $rw = ceil($width * $rh / $height);
502 return array(intval($rw), intval($rh),
503 intval($cx), intval($cy),
504 is_null($cw) ? $width : intval($cw),
505 is_null($ch) ? $height : intval($ch));
509 * Animated GIF test, courtesy of frank at huddler dot com et al:
510 * http://php.net/manual/en/function.imagecreatefromgif.php#104473
511 * Modified so avoid landing inside of a header (and thus not matching our regexp).
513 protected function isAnimatedGif()
515 if (!($fh = @fopen($this->filepath, 'rb'))) {
520 //an animated gif contains multiple "frames", with each frame having a
522 // * a static 4-byte sequence (\x00\x21\xF9\x04)
523 // * 4 variable bytes
524 // * a static 2-byte sequence (\x00\x2C)
525 // In total the header is maximum 10 bytes.
527 // We read through the file til we reach the end of the file, or we've found
528 // at least 2 frame headers
529 while(!feof($fh) && $count < 2) {
530 $chunk = fread($fh, 1024 * 100); //read 100kb at a time
531 $count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);
532 // rewind in case we ended up in the middle of the header, but avoid
533 // infinite loop (i.e. don't rewind if we're already in the end).
534 if (!feof($fh) && ftell($fh) >= 9) {
535 fseek($fh, -9, SEEK_CUR);
543 public function getFileThumbnail($width, $height, $crop)
545 if (!$this->fileRecord instanceof File) {
546 throw new ServerException('No File object attached to this ImageFile object.');
549 if ($width === null) {
550 $width = common_config('thumbnail', 'width');
551 $height = common_config('thumbnail', 'height');
552 $crop = common_config('thumbnail', 'crop');
555 if ($height === null) {
560 // Get proper aspect ratio width and height before lookup
561 // We have to do it through an ImageFile object because of orientation etc.
562 // Only other solution would've been to rotate + rewrite uploaded files
563 // which we don't want to do because we like original, untouched data!
564 list($width, $height, $x, $y, $w, $h) = $this->scaleToFit($width, $height, $crop);
566 $thumb = File_thumbnail::pkeyGet(array(
567 'file_id'=> $this->fileRecord->id,
571 if ($thumb instanceof File_thumbnail) {
575 $filename = $this->fileRecord->filehash ?: $this->filename; // Remote files don't have $this->filehash
576 $extension = File::guessMimeExtension($this->mimetype);
577 $outname = "thumb-{$this->fileRecord->id}-{$width}x{$height}-{$filename}." . $extension;
578 $outpath = File_thumbnail::path($outname);
580 // The boundary box for our resizing
581 $box = array('width'=>$width, 'height'=>$height,
585 // Doublecheck that parameters are sane and integers.
586 if ($box['width'] < 1 || $box['width'] > common_config('thumbnail', 'maxsize')
587 || $box['height'] < 1 || $box['height'] > common_config('thumbnail', 'maxsize')
588 || $box['w'] < 1 || $box['x'] >= $this->width
589 || $box['h'] < 1 || $box['y'] >= $this->height) {
590 // Fail on bad width parameter. If this occurs, it's due to algorithm in ImageFile->scaleToFit
591 common_debug("Boundary box parameters for resize of {$this->filepath} : ".var_export($box,true));
592 throw new ServerException('Bad thumbnail size parameters.');
595 common_debug(sprintf('Generating a thumbnail of File id==%u of size %ux%u', $this->fileRecord->id, $width, $height));
597 // Perform resize and store into file
598 $this->resizeTo($outpath, $box);
600 // Avoid deleting the original
601 if ($this->getPath() != File_thumbnail::path($this->filename)) {
604 return File_thumbnail::saveThumbnail($this->fileRecord->id,
605 File_thumbnail::url($outname),
611 //PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
612 if(!function_exists('imagecreatefrombmp')){
613 //taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
614 function imagecreatefrombmp($p_sFile)
616 // Load the image into a string
617 $file = fopen($p_sFile,"rb");
618 $read = fread($file,10);
619 while(!feof($file)&&($read<>""))
620 $read .= fread($file,1024);
622 $temp = unpack("H*",$read);
624 $header = substr($hex,0,108);
626 // Process the header
627 // Structure: http://www.fastgraph.com/help/bmp_header_format.html
628 if (substr($header,0,4)=="424d")
630 // Cut it in parts of 2 bytes
631 $header_parts = str_split($header,2);
633 // Get the width 4 bytes
634 $width = hexdec($header_parts[19].$header_parts[18]);
636 // Get the height 4 bytes
637 $height = hexdec($header_parts[23].$header_parts[22]);
639 // Unset the header params
640 unset($header_parts);
643 // Define starting X and Y
648 $image = imagecreatetruecolor($width,$height);
650 // Grab the body from the image
651 $body = substr($hex,108);
653 // Calculate if padding at the end-line is needed
654 // Divided by two to keep overview.
655 // 1 byte = 2 HEX-chars
656 $body_size = (strlen($body)/2);
657 $header_size = ($width*$height);
659 // Use end-line padding? Only when needed
660 $usePadding = ($body_size>($header_size*3)+4);
662 // Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
663 // Calculate the next DWORD-position in the body
664 for ($i=0;$i<$body_size;$i+=3)
666 // Calculate line-ending and padding
669 // If padding needed, ignore image-padding
670 // Shift i to the ending of the current 32-bit-block
674 // Reset horizontal position
677 // Raise the height-position (bottom-up)
680 // Reached the image-height? Break the for-loop
685 // Calculation of the RGB-pixel (defined as BGR in image-data)
686 // Define $i_pos as absolute position in the body
688 $r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
689 $g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
690 $b = hexdec($body[$i_pos].$body[$i_pos+1]);
692 // Calculate and draw the pixel
693 $color = imagecolorallocate($image,$r,$g,$b);
694 imagesetpixel($image,$x,$height-$y,$color);
696 // Raise the horizontal position
700 // Unset the body / free the memory
703 // Return image-object
706 } // if(!function_exists('imagecreatefrombmp'))