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 = File::getKV('id', $this->id);
65 if (!$this->fileRecord instanceof File) {
66 throw new ServerException('Expected File object did not exist.');
69 $this->filepath = $filepath;
70 $this->filename = basename($filepath);
72 $info = @getimagesize($this->filepath);
75 ($info[2] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) ||
76 ($info[2] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) ||
77 $info[2] == IMAGETYPE_BMP ||
78 ($info[2] == IMAGETYPE_WBMP && function_exists('imagecreatefromwbmp')) ||
79 ($info[2] == IMAGETYPE_XBM && function_exists('imagecreatefromxbm')) ||
80 ($info[2] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')))) {
82 // TRANS: Exception thrown when trying to upload an unsupported image file format.
83 throw new UnsupportedMediaException(_('Unsupported image format.'), $this->filepath);
86 $this->width = $info[0];
87 $this->height = $info[1];
88 $this->type = $info[2];
89 $this->mimetype = $info['mime'];
91 if ($this->type == IMAGETYPE_JPEG && function_exists('exif_read_data')) {
92 // Orientation value to rotate thumbnails properly
93 $exif = exif_read_data($this->filepath);
94 if (is_array($exif) && isset($exif['Orientation'])) {
95 switch ((int)$exif['Orientation']) {
99 case 3: // top is bottom
102 case 6: // top is right
105 case 8: // top is left
109 // If we ever write this back, Orientation should be set to '1'
111 } elseif ($this->type === IMAGETYPE_GIF) {
112 $this->animated = $this->isAnimatedGif();
115 Event::handle('FillImageFileMetadata', array($this));
118 public static function fromFileObject(File $file)
121 $media = common_get_mime_media($file->mimetype);
122 if (Event::handle('CreateFileImageThumbnailSource', array($file, &$imgPath, $media))) {
123 if (empty($file->filename)) {
124 throw new UnsupportedMediaException(_('File without filename could not get a thumbnail source.'));
128 $imgPath = $file->getPath();
131 throw new UnsupportedMediaException(_('Unsupported media format.'), $file->getPath());
135 if (!file_exists($imgPath)) {
136 throw new ServerException(sprintf('Image not available locally: %s', $imgPath));
140 $image = new ImageFile($file->id, $imgPath);
141 } catch (UnsupportedMediaException $e) {
142 // Avoid deleting the original
143 if ($imgPath != $file->getPath()) {
151 public function getPath()
153 if (!file_exists($this->filepath)) {
154 throw new FileNotFoundException($this->filepath);
157 return $this->filepath;
160 static function fromUpload($param='upload')
162 switch ($_FILES[$param]['error']) {
163 case UPLOAD_ERR_OK: // success, jump out
166 case UPLOAD_ERR_INI_SIZE:
167 case UPLOAD_ERR_FORM_SIZE:
168 // TRANS: Exception thrown when too large a file is uploaded.
169 // TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
170 throw new Exception(sprintf(_('That file is too big. The maximum file size is %s.'), ImageFile::maxFileSize()));
172 case UPLOAD_ERR_PARTIAL:
173 @unlink($_FILES[$param]['tmp_name']);
174 // TRANS: Exception thrown when uploading an image and that action could not be completed.
175 throw new Exception(_('Partial upload.'));
177 case UPLOAD_ERR_NO_FILE:
178 // No file; probably just a non-AJAX submission.
180 common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " . $_FILES[$param]['error']);
181 // TRANS: Exception thrown when uploading an image fails for an unknown reason.
182 throw new Exception(_('System error uploading file.'));
185 $info = @getimagesize($_FILES[$param]['tmp_name']);
188 @unlink($_FILES[$param]['tmp_name']);
189 // TRANS: Exception thrown when uploading a file as image that is not an image or is a corrupt file.
190 throw new UnsupportedMediaException(_('Not an image or corrupt file.'), '[deleted]');
193 return new ImageFile(null, $_FILES[$param]['tmp_name']);
197 * Compat interface for old code generating avatar thumbnails...
198 * Saves the scaled file directly into the avatar area.
200 * @param int $size target width & height -- must be square
201 * @param int $x (default 0) upper-left corner to crop from
202 * @param int $y (default 0) upper-left corner to crop from
203 * @param int $w (default full) width of image area to crop
204 * @param int $h (default full) height of image area to crop
205 * @return string filename
207 function resize($size, $x = 0, $y = 0, $w = null, $h = null)
209 $targetType = $this->preferredType();
210 $outname = Avatar::filename($this->id,
211 image_type_to_extension($targetType),
214 $outpath = Avatar::path($outname);
215 $this->resizeTo($outpath, array('width'=>$size, 'height'=>$size,
222 * Copy the image file to the given destination.
224 * This function may modify the resulting file. Please use the
225 * returned ImageFile object to read metadata (width, height etc.)
227 * @param string $outpath
228 * @return ImageFile the image stored at target path
230 function copyTo($outpath)
232 return new ImageFile(null, $this->resizeTo($outpath));
236 * Create and save a thumbnail image.
238 * @param string $outpath
239 * @param array $box width, height, boundary box (x,y,w,h) defaults to full image
240 * @return string full local filesystem filename
242 function resizeTo($outpath, array $box=array())
244 $box['width'] = isset($box['width']) ? intval($box['width']) : $this->width;
245 $box['height'] = isset($box['height']) ? intval($box['height']) : $this->height;
246 $box['x'] = isset($box['x']) ? intval($box['x']) : 0;
247 $box['y'] = isset($box['y']) ? intval($box['y']) : 0;
248 $box['w'] = isset($box['w']) ? intval($box['w']) : $this->width;
249 $box['h'] = isset($box['h']) ? intval($box['h']) : $this->height;
251 if (!file_exists($this->filepath)) {
252 // TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
253 throw new Exception(_('Lost our file.'));
256 // Don't rotate/crop/scale if it isn't necessary
257 if ($box['width'] === $this->width
258 && $box['height'] === $this->height
261 && $box['w'] === $this->width
262 && $box['h'] === $this->height
263 && $this->type == $this->preferredType()) {
264 if ($this->rotate == 0) {
265 // No rotational difference, just copy it as-is
266 @copy($this->filepath, $outpath);
268 } elseif (abs($this->rotate) == 90) {
269 // Box is rotated 90 degrees in either direction,
270 // so we have to redefine x to y and vice versa.
271 $tmp = $box['width'];
272 $box['width'] = $box['height'];
273 $box['height'] = $tmp;
275 $box['x'] = $box['y'];
278 $box['w'] = $box['h'];
284 if (Event::handle('StartResizeImageFile', array($this, $outpath, $box))) {
285 $this->resizeToFile($outpath, $box);
288 if (!file_exists($outpath)) {
289 throw new UseFileAsThumbnailException($this->id);
295 protected function resizeToFile($outpath, array $box)
297 switch ($this->type) {
299 $image_src = imagecreatefromgif($this->filepath);
302 $image_src = imagecreatefromjpeg($this->filepath);
305 $image_src = imagecreatefrompng($this->filepath);
308 $image_src = imagecreatefrombmp($this->filepath);
311 $image_src = imagecreatefromwbmp($this->filepath);
314 $image_src = imagecreatefromxbm($this->filepath);
317 // TRANS: Exception thrown when trying to resize an unknown file type.
318 throw new Exception(_('Unknown file type'));
321 if ($this->rotate != 0) {
322 $image_src = imagerotate($image_src, $this->rotate, 0);
325 $image_dest = imagecreatetruecolor($box['width'], $box['height']);
327 if ($this->type == IMAGETYPE_GIF || $this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
329 $transparent_idx = imagecolortransparent($image_src);
331 if ($transparent_idx >= 0) {
333 $transparent_color = imagecolorsforindex($image_src, $transparent_idx);
334 $transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
335 imagefill($image_dest, 0, 0, $transparent_idx);
336 imagecolortransparent($image_dest, $transparent_idx);
338 } elseif ($this->type == IMAGETYPE_PNG) {
340 imagealphablending($image_dest, false);
341 $transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
342 imagefill($image_dest, 0, 0, $transparent);
343 imagesavealpha($image_dest, true);
348 imagecopyresampled($image_dest, $image_src, 0, 0, $box['x'], $box['y'], $box['width'], $box['height'], $box['w'], $box['h']);
350 switch ($this->preferredType()) {
352 imagegif($image_dest, $outpath);
355 imagejpeg($image_dest, $outpath, common_config('image', 'jpegquality'));
358 imagepng($image_dest, $outpath);
361 // TRANS: Exception thrown when trying resize an unknown file type.
362 throw new Exception(_('Unknown file type'));
365 imagedestroy($image_src);
366 imagedestroy($image_dest);
371 * Several obscure file types should be normalized to PNG on resize.
373 * @fixme consider flattening anything not GIF or JPEG to PNG
376 function preferredType()
378 if($this->type == IMAGETYPE_BMP) {
379 //we don't want to save BMP... it's an inefficient, rare, antiquated format
381 return IMAGETYPE_PNG;
382 } else if($this->type == IMAGETYPE_WBMP) {
383 //we don't want to save WBMP... it's a rare format that we can't guarantee clients will support
385 return IMAGETYPE_PNG;
386 } else if($this->type == IMAGETYPE_XBM) {
387 //we don't want to save XBM... it's a rare format that we can't guarantee clients will support
389 return IMAGETYPE_PNG;
396 @unlink($this->filepath);
399 static function maxFileSize()
401 $value = ImageFile::maxFileSizeInt();
403 if ($value > 1024 * 1024) {
404 $value = $value/(1024*1024);
405 // TRANS: Number of megabytes. %d is the number.
406 return sprintf(_m('%dMB','%dMB',$value),$value);
407 } else if ($value > 1024) {
408 $value = $value/1024;
409 // TRANS: Number of kilobytes. %d is the number.
410 return sprintf(_m('%dkB','%dkB',$value),$value);
412 // TRANS: Number of bytes. %d is the number.
413 return sprintf(_m('%dB','%dB',$value),$value);
417 static function maxFileSizeInt()
419 return min(ImageFile::strToInt(ini_get('post_max_size')),
420 ImageFile::strToInt(ini_get('upload_max_filesize')),
421 ImageFile::strToInt(ini_get('memory_limit')));
424 static function strToInt($str)
426 $unit = substr($str, -1);
427 $num = substr($str, 0, -1);
429 switch(strtoupper($unit)){
441 public function scaleToFit($maxWidth=null, $maxHeight=null, $crop=null)
443 return self::getScalingValues($this->width, $this->height,
444 $maxWidth, $maxHeight, $crop, $this->rotate);
448 * Gets scaling values for images of various types. Cropping can be enabled.
450 * Values will scale _up_ to fit max values if cropping is enabled!
451 * With cropping disabled, the max value of each axis will be respected.
453 * @param $width int Original width
454 * @param $height int Original height
455 * @param $maxW int Resulting max width
456 * @param $maxH int Resulting max height
457 * @param $crop int Crop to the size (not preserving aspect ratio)
459 public static function getScalingValues($width, $height,
460 $maxW=null, $maxH=null,
461 $crop=null, $rotate=0)
463 $maxW = $maxW ?: common_config('thumbnail', 'width');
464 $maxH = $maxH ?: common_config('thumbnail', 'height');
466 if ($maxW < 1 || ($maxH !== null && $maxH < 1)) {
467 throw new ServerException('Bad parameters for ImageFile::getScalingValues');
468 } elseif ($maxH === null) {
469 // if maxH is null, we set maxH to equal maxW and enable crop
474 // Because GD doesn't understand EXIF orientation etc.
475 if (abs($rotate) == 90) {
481 // Cropping data (for original image size). Default values, 0 and null,
482 // imply no cropping and with preserved aspect ratio (per axis).
485 $cw = null; // crop area width
486 $ch = null; // crop area height
489 $s_ar = $width / $height;
490 $t_ar = $maxW / $maxH;
495 // Source aspect ratio differs from target, recalculate crop points!
497 $cx = floor($width / 2 - $height * $t_ar / 2);
498 $cw = ceil($height * $t_ar);
499 } elseif ($s_ar < $t_ar) {
500 $cy = floor($height / 2 - $width / $t_ar / 2);
501 $ch = ceil($width / $t_ar);
505 $rh = ceil($height * $rw / $width);
507 // Scaling caused too large height, decrease to max accepted value
510 $rw = ceil($width * $rh / $height);
513 return array(intval($rw), intval($rh),
514 intval($cx), intval($cy),
515 is_null($cw) ? $width : intval($cw),
516 is_null($ch) ? $height : intval($ch));
520 * Animated GIF test, courtesy of frank at huddler dot com et al:
521 * http://php.net/manual/en/function.imagecreatefromgif.php#104473
522 * Modified so avoid landing inside of a header (and thus not matching our regexp).
524 protected function isAnimatedGif()
526 if (!($fh = @fopen($this->filepath, 'rb'))) {
531 //an animated gif contains multiple "frames", with each frame having a
533 // * a static 4-byte sequence (\x00\x21\xF9\x04)
534 // * 4 variable bytes
535 // * a static 2-byte sequence (\x00\x2C)
536 // In total the header is maximum 10 bytes.
538 // We read through the file til we reach the end of the file, or we've found
539 // at least 2 frame headers
540 while(!feof($fh) && $count < 2) {
541 $chunk = fread($fh, 1024 * 100); //read 100kb at a time
542 $count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);
543 // rewind in case we ended up in the middle of the header, but avoid
544 // infinite loop (i.e. don't rewind if we're already in the end).
545 if (!feof($fh) && ftell($fh) >= 9) {
546 fseek($fh, -9, SEEK_CUR);
554 public function getFileThumbnail($width, $height, $crop)
556 if (!$this->fileRecord instanceof File) {
557 throw new ServerException('No File object attached to this ImageFile object.');
560 if ($width === null) {
561 $width = common_config('thumbnail', 'width');
562 $height = common_config('thumbnail', 'height');
563 $crop = common_config('thumbnail', 'crop');
566 if ($height === null) {
571 // Get proper aspect ratio width and height before lookup
572 // We have to do it through an ImageFile object because of orientation etc.
573 // Only other solution would've been to rotate + rewrite uploaded files
574 // which we don't want to do because we like original, untouched data!
575 list($width, $height, $x, $y, $w, $h) = $this->scaleToFit($width, $height, $crop);
577 $thumb = File_thumbnail::pkeyGet(array(
578 'file_id'=> $this->fileRecord->id,
582 if ($thumb instanceof File_thumbnail) {
586 $filename = $this->fileRecord->filehash ?: $this->filename; // Remote files don't have $this->filehash
587 $extension = File::guessMimeExtension($this->mimetype);
588 $outname = "thumb-{$this->fileRecord->id}-{$width}x{$height}-{$filename}." . $extension;
589 $outpath = File_thumbnail::path($outname);
591 // The boundary box for our resizing
592 $box = array('width'=>$width, 'height'=>$height,
596 // Doublecheck that parameters are sane and integers.
597 if ($box['width'] < 1 || $box['width'] > common_config('thumbnail', 'maxsize')
598 || $box['height'] < 1 || $box['height'] > common_config('thumbnail', 'maxsize')
599 || $box['w'] < 1 || $box['x'] >= $this->width
600 || $box['h'] < 1 || $box['y'] >= $this->height) {
601 // Fail on bad width parameter. If this occurs, it's due to algorithm in ImageFile->scaleToFit
602 common_debug("Boundary box parameters for resize of {$this->filepath} : ".var_export($box,true));
603 throw new ServerException('Bad thumbnail size parameters.');
606 common_debug(sprintf('Generating a thumbnail of File id==%u of size %ux%u', $this->fileRecord->id, $width, $height));
608 // Perform resize and store into file
609 $this->resizeTo($outpath, $box);
611 // Avoid deleting the original
612 if ($this->getPath() != File_thumbnail::path($this->filename)) {
615 return File_thumbnail::saveThumbnail($this->fileRecord->id,
616 File_thumbnail::url($outname),
622 //PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
623 if(!function_exists('imagecreatefrombmp')){
624 //taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
625 function imagecreatefrombmp($p_sFile)
627 // Load the image into a string
628 $file = fopen($p_sFile,"rb");
629 $read = fread($file,10);
630 while(!feof($file)&&($read<>""))
631 $read .= fread($file,1024);
633 $temp = unpack("H*",$read);
635 $header = substr($hex,0,108);
637 // Process the header
638 // Structure: http://www.fastgraph.com/help/bmp_header_format.html
639 if (substr($header,0,4)=="424d")
641 // Cut it in parts of 2 bytes
642 $header_parts = str_split($header,2);
644 // Get the width 4 bytes
645 $width = hexdec($header_parts[19].$header_parts[18]);
647 // Get the height 4 bytes
648 $height = hexdec($header_parts[23].$header_parts[22]);
650 // Unset the header params
651 unset($header_parts);
654 // Define starting X and Y
659 $image = imagecreatetruecolor($width,$height);
661 // Grab the body from the image
662 $body = substr($hex,108);
664 // Calculate if padding at the end-line is needed
665 // Divided by two to keep overview.
666 // 1 byte = 2 HEX-chars
667 $body_size = (strlen($body)/2);
668 $header_size = ($width*$height);
670 // Use end-line padding? Only when needed
671 $usePadding = ($body_size>($header_size*3)+4);
673 // Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
674 // Calculate the next DWORD-position in the body
675 for ($i=0;$i<$body_size;$i+=3)
677 // Calculate line-ending and padding
680 // If padding needed, ignore image-padding
681 // Shift i to the ending of the current 32-bit-block
685 // Reset horizontal position
688 // Raise the height-position (bottom-up)
691 // Reached the image-height? Break the for-loop
696 // Calculation of the RGB-pixel (defined as BGR in image-data)
697 // Define $i_pos as absolute position in the body
699 $r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
700 $g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
701 $b = hexdec($body[$i_pos].$body[$i_pos+1]);
703 // Calculate and draw the pixel
704 $color = imagecolorallocate($image,$r,$g,$b);
705 imagesetpixel($image,$x,$height-$y,$color);
707 // Raise the horizontal position
711 // Unset the body / free the memory
714 // Return image-object
717 } // if(!function_exists('imagecreatefrombmp'))