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 $animated = null; // Animated image? (has more than 1 frame). null means untested
57 function __construct($id=null, $filepath=null, $type=null, $width=null, $height=null)
60 $this->filepath = $filepath;
61 $this->filename = basename($filepath);
63 $info = @getimagesize($this->filepath);
66 ($info[2] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) ||
67 ($info[2] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) ||
68 $info[2] == IMAGETYPE_BMP ||
69 ($info[2] == IMAGETYPE_WBMP && function_exists('imagecreatefromwbmp')) ||
70 ($info[2] == IMAGETYPE_XBM && function_exists('imagecreatefromxbm')) ||
71 ($info[2] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')))) {
73 // TRANS: Exception thrown when trying to upload an unsupported image file format.
74 throw new UnsupportedMediaException(_('Unsupported image format.'), $this->filepath);
77 $this->type = ($info) ? $info[2]:$type;
78 $this->width = ($info) ? $info[0]:$width;
79 $this->height = ($info) ? $info[1]:$height;
81 if ($this->type == IMAGETYPE_JPEG && function_exists('exif_read_data')) {
82 // Orientation value to rotate thumbnails properly
83 $exif = exif_read_data($this->filepath);
84 if (is_array($exif) && isset($exif['Orientation'])) {
85 switch ((int)$exif['Orientation']) {
89 case 3: // top is bottom
92 case 6: // top is right
95 case 8: // top is left
99 // If we ever write this back, Orientation should be set to '1'
101 } elseif ($this->type === IMAGETYPE_GIF) {
102 $this->animated = $this->isAnimatedGif();
105 Event::handle('FillImageFileMetadata', array($this));
108 public static function fromFileObject(File $file)
111 $media = common_get_mime_media($file->mimetype);
112 if (Event::handle('CreateFileImageThumbnailSource', array($file, &$imgPath, $media))) {
113 if (empty($file->filename)) {
114 throw new UnsupportedMediaException(_('File without filename could not get a thumbnail source.'));
118 $imgPath = $file->getPath();
121 throw new UnsupportedMediaException(_('Unsupported media format.'), $file->getPath());
125 if (!file_exists($imgPath)) {
126 throw new ServerException(sprintf('Image not available locally: %s', $imgPath));
130 $image = new ImageFile($file->id, $imgPath);
131 } catch (UnsupportedMediaException $e) {
132 // Avoid deleting the original
133 if ($imgPath != $file->getPath()) {
141 public function getPath()
143 if (!file_exists($this->filepath)) {
144 throw new ServerException('No file in ImageFile filepath');
147 return $this->filepath;
150 static function fromUpload($param='upload')
152 switch ($_FILES[$param]['error']) {
153 case UPLOAD_ERR_OK: // success, jump out
156 case UPLOAD_ERR_INI_SIZE:
157 case UPLOAD_ERR_FORM_SIZE:
158 // TRANS: Exception thrown when too large a file is uploaded.
159 // TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
160 throw new Exception(sprintf(_('That file is too big. The maximum file size is %s.'), ImageFile::maxFileSize()));
162 case UPLOAD_ERR_PARTIAL:
163 @unlink($_FILES[$param]['tmp_name']);
164 // TRANS: Exception thrown when uploading an image and that action could not be completed.
165 throw new Exception(_('Partial upload.'));
167 case UPLOAD_ERR_NO_FILE:
168 // No file; probably just a non-AJAX submission.
170 common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " . $_FILES[$param]['error']);
171 // TRANS: Exception thrown when uploading an image fails for an unknown reason.
172 throw new Exception(_('System error uploading file.'));
175 $info = @getimagesize($_FILES[$param]['tmp_name']);
178 @unlink($_FILES[$param]['tmp_name']);
179 // TRANS: Exception thrown when uploading a file as image that is not an image or is a corrupt file.
180 throw new UnsupportedMediaException(_('Not an image or corrupt file.'), '[deleted]');
183 return new ImageFile(null, $_FILES[$param]['tmp_name']);
187 * Compat interface for old code generating avatar thumbnails...
188 * Saves the scaled file directly into the avatar area.
190 * @param int $size target width & height -- must be square
191 * @param int $x (default 0) upper-left corner to crop from
192 * @param int $y (default 0) upper-left corner to crop from
193 * @param int $w (default full) width of image area to crop
194 * @param int $h (default full) height of image area to crop
195 * @return string filename
197 function resize($size, $x = 0, $y = 0, $w = null, $h = null)
199 $targetType = $this->preferredType();
200 $outname = Avatar::filename($this->id,
201 image_type_to_extension($targetType),
204 $outpath = Avatar::path($outname);
205 $this->resizeTo($outpath, array('width'=>$size, 'height'=>$size,
212 * Copy the image file to the given destination.
214 * This function may modify the resulting file. Please use the
215 * returned ImageFile object to read metadata (width, height etc.)
217 * @param string $outpath
218 * @return ImageFile the image stored at target path
220 function copyTo($outpath)
222 return new ImageFile(null, $this->resizeTo($outpath));
226 * Create and save a thumbnail image.
228 * @param string $outpath
229 * @param array $box width, height, boundary box (x,y,w,h) defaults to full image
230 * @return string full local filesystem filename
232 function resizeTo($outpath, array $box=array())
234 $box['width'] = isset($box['width']) ? intval($box['width']) : $this->width;
235 $box['height'] = isset($box['height']) ? intval($box['height']) : $this->height;
236 $box['x'] = isset($box['x']) ? intval($box['x']) : 0;
237 $box['y'] = isset($box['y']) ? intval($box['y']) : 0;
238 $box['w'] = isset($box['w']) ? intval($box['w']) : $this->width;
239 $box['h'] = isset($box['h']) ? intval($box['h']) : $this->height;
241 if (!file_exists($this->filepath)) {
242 // TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
243 throw new Exception(_('Lost our file.'));
246 // Don't rotate/crop/scale if it isn't necessary
247 if ($box['width'] === $this->width
248 && $box['height'] === $this->height
251 && $box['w'] === $this->width
252 && $box['h'] === $this->height
253 && $this->type == $this->preferredType()) {
254 if ($this->rotate == 0) {
255 // No rotational difference, just copy it as-is
256 @copy($this->filepath, $outpath);
258 } elseif (abs($this->rotate) == 90) {
259 // Box is rotated 90 degrees in either direction,
260 // so we have to redefine x to y and vice versa.
261 $tmp = $box['width'];
262 $box['width'] = $box['height'];
263 $box['height'] = $tmp;
265 $box['x'] = $box['y'];
268 $box['w'] = $box['h'];
274 if (Event::handle('StartResizeImageFile', array($this, $outpath, $box))) {
275 $this->resizeToFile($outpath, $box);
278 if (!file_exists($outpath)) {
279 throw new UseFileAsThumbnailException($this->id);
285 protected function resizeToFile($outpath, array $box)
287 switch ($this->type) {
289 $image_src = imagecreatefromgif($this->filepath);
292 $image_src = imagecreatefromjpeg($this->filepath);
295 $image_src = imagecreatefrompng($this->filepath);
298 $image_src = imagecreatefrombmp($this->filepath);
301 $image_src = imagecreatefromwbmp($this->filepath);
304 $image_src = imagecreatefromxbm($this->filepath);
307 // TRANS: Exception thrown when trying to resize an unknown file type.
308 throw new Exception(_('Unknown file type'));
311 if ($this->rotate != 0) {
312 $image_src = imagerotate($image_src, $this->rotate, 0);
315 $image_dest = imagecreatetruecolor($box['width'], $box['height']);
317 if ($this->type == IMAGETYPE_GIF || $this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
319 $transparent_idx = imagecolortransparent($image_src);
321 if ($transparent_idx >= 0) {
323 $transparent_color = imagecolorsforindex($image_src, $transparent_idx);
324 $transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
325 imagefill($image_dest, 0, 0, $transparent_idx);
326 imagecolortransparent($image_dest, $transparent_idx);
328 } elseif ($this->type == IMAGETYPE_PNG) {
330 imagealphablending($image_dest, false);
331 $transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
332 imagefill($image_dest, 0, 0, $transparent);
333 imagesavealpha($image_dest, true);
338 imagecopyresampled($image_dest, $image_src, 0, 0, $box['x'], $box['y'], $box['width'], $box['height'], $box['w'], $box['h']);
340 switch ($this->preferredType()) {
342 imagegif($image_dest, $outpath);
345 imagejpeg($image_dest, $outpath, common_config('image', 'jpegquality'));
348 imagepng($image_dest, $outpath);
351 // TRANS: Exception thrown when trying resize an unknown file type.
352 throw new Exception(_('Unknown file type'));
355 imagedestroy($image_src);
356 imagedestroy($image_dest);
361 * Several obscure file types should be normalized to PNG on resize.
363 * @fixme consider flattening anything not GIF or JPEG to PNG
366 function preferredType()
368 if($this->type == IMAGETYPE_BMP) {
369 //we don't want to save BMP... it's an inefficient, rare, antiquated format
371 return IMAGETYPE_PNG;
372 } else if($this->type == IMAGETYPE_WBMP) {
373 //we don't want to save WBMP... it's a rare format that we can't guarantee clients will support
375 return IMAGETYPE_PNG;
376 } else if($this->type == IMAGETYPE_XBM) {
377 //we don't want to save XBM... it's a rare format that we can't guarantee clients will support
379 return IMAGETYPE_PNG;
386 @unlink($this->filepath);
389 static function maxFileSize()
391 $value = ImageFile::maxFileSizeInt();
393 if ($value > 1024 * 1024) {
394 $value = $value/(1024*1024);
395 // TRANS: Number of megabytes. %d is the number.
396 return sprintf(_m('%dMB','%dMB',$value),$value);
397 } else if ($value > 1024) {
398 $value = $value/1024;
399 // TRANS: Number of kilobytes. %d is the number.
400 return sprintf(_m('%dkB','%dkB',$value),$value);
402 // TRANS: Number of bytes. %d is the number.
403 return sprintf(_m('%dB','%dB',$value),$value);
407 static function maxFileSizeInt()
409 return min(ImageFile::strToInt(ini_get('post_max_size')),
410 ImageFile::strToInt(ini_get('upload_max_filesize')),
411 ImageFile::strToInt(ini_get('memory_limit')));
414 static function strToInt($str)
416 $unit = substr($str, -1);
417 $num = substr($str, 0, -1);
419 switch(strtoupper($unit)){
431 public function scaleToFit($maxWidth=null, $maxHeight=null, $crop=null)
433 return self::getScalingValues($this->width, $this->height,
434 $maxWidth, $maxHeight, $crop, $this->rotate);
438 * Gets scaling values for images of various types. Cropping can be enabled.
440 * Values will scale _up_ to fit max values if cropping is enabled!
441 * With cropping disabled, the max value of each axis will be respected.
443 * @param $width int Original width
444 * @param $height int Original height
445 * @param $maxW int Resulting max width
446 * @param $maxH int Resulting max height
447 * @param $crop int Crop to the size (not preserving aspect ratio)
449 public static function getScalingValues($width, $height,
450 $maxW=null, $maxH=null,
451 $crop=null, $rotate=0)
453 $maxW = $maxW ?: common_config('thumbnail', 'width');
454 $maxH = $maxH ?: common_config('thumbnail', 'height');
456 if ($maxW < 1 || ($maxH !== null && $maxH < 1)) {
457 throw new ServerException('Bad parameters for ImageFile::getScalingValues');
458 } elseif ($maxH === null) {
459 // if maxH is null, we set maxH to equal maxW and enable crop
464 // Because GD doesn't understand EXIF orientation etc.
465 if (abs($rotate) == 90) {
471 // Cropping data (for original image size). Default values, 0 and null,
472 // imply no cropping and with preserved aspect ratio (per axis).
475 $cw = null; // crop area width
476 $ch = null; // crop area height
479 $s_ar = $width / $height;
480 $t_ar = $maxW / $maxH;
485 // Source aspect ratio differs from target, recalculate crop points!
487 $cx = floor($width / 2 - $height * $t_ar / 2);
488 $cw = ceil($height * $t_ar);
489 } elseif ($s_ar < $t_ar) {
490 $cy = floor($height / 2 - $width / $t_ar / 2);
491 $ch = ceil($width / $t_ar);
495 $rh = ceil($height * $rw / $width);
497 // Scaling caused too large height, decrease to max accepted value
500 $rw = ceil($width * $rh / $height);
503 return array(intval($rw), intval($rh),
504 intval($cx), intval($cy),
505 is_null($cw) ? $width : intval($cw),
506 is_null($ch) ? $height : intval($ch));
510 * Animated GIF test, courtesy of frank at huddler dot com et al:
511 * http://php.net/manual/en/function.imagecreatefromgif.php#104473
512 * Modified so avoid landing inside of a header (and thus not matching our regexp).
514 protected function isAnimatedGif()
516 if (!($fh = @fopen($this->filepath, 'rb'))) {
521 //an animated gif contains multiple "frames", with each frame having a
523 // * a static 4-byte sequence (\x00\x21\xF9\x04)
524 // * 4 variable bytes
525 // * a static 2-byte sequence (\x00\x2C)
526 // In total the header is maximum 10 bytes.
528 // We read through the file til we reach the end of the file, or we've found
529 // at least 2 frame headers
530 while(!feof($fh) && $count < 2) {
531 $chunk = fread($fh, 1024 * 100); //read 100kb at a time
532 $count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);
533 // rewind in case we ended up in the middle of the header, but avoid
534 // infinite loop (i.e. don't rewind if we're already in the end).
535 if (!feof($fh) && ftell($fh) >= 9) {
536 fseek($fh, -9, SEEK_CUR);
545 //PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
546 if(!function_exists('imagecreatefrombmp')){
547 //taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
548 function imagecreatefrombmp($p_sFile)
550 // Load the image into a string
551 $file = fopen($p_sFile,"rb");
552 $read = fread($file,10);
553 while(!feof($file)&&($read<>""))
554 $read .= fread($file,1024);
556 $temp = unpack("H*",$read);
558 $header = substr($hex,0,108);
560 // Process the header
561 // Structure: http://www.fastgraph.com/help/bmp_header_format.html
562 if (substr($header,0,4)=="424d")
564 // Cut it in parts of 2 bytes
565 $header_parts = str_split($header,2);
567 // Get the width 4 bytes
568 $width = hexdec($header_parts[19].$header_parts[18]);
570 // Get the height 4 bytes
571 $height = hexdec($header_parts[23].$header_parts[22]);
573 // Unset the header params
574 unset($header_parts);
577 // Define starting X and Y
582 $image = imagecreatetruecolor($width,$height);
584 // Grab the body from the image
585 $body = substr($hex,108);
587 // Calculate if padding at the end-line is needed
588 // Divided by two to keep overview.
589 // 1 byte = 2 HEX-chars
590 $body_size = (strlen($body)/2);
591 $header_size = ($width*$height);
593 // Use end-line padding? Only when needed
594 $usePadding = ($body_size>($header_size*3)+4);
596 // Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
597 // Calculate the next DWORD-position in the body
598 for ($i=0;$i<$body_size;$i+=3)
600 // Calculate line-ending and padding
603 // If padding needed, ignore image-padding
604 // Shift i to the ending of the current 32-bit-block
608 // Reset horizontal position
611 // Raise the height-position (bottom-up)
614 // Reached the image-height? Break the for-loop
619 // Calculation of the RGB-pixel (defined as BGR in image-data)
620 // Define $i_pos as absolute position in the body
622 $r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
623 $g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
624 $b = hexdec($body[$i_pos].$body[$i_pos+1]);
626 // Calculate and draw the pixel
627 $color = imagecolorallocate($image,$r,$g,$b);
628 imagesetpixel($image,$x,$height-$y,$color);
630 // Raise the horizontal position
634 // Unset the body / free the memory
637 // Return image-object
640 } // if(!function_exists('imagecreatefrombmp'))