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 $animated = false; // Animated image? (has more than 2 frames)
57 function __construct($id=null, $filepath=null, $type=null, $width=null, $height=null)
60 $this->filepath = $filepath;
62 $info = @getimagesize($this->filepath);
65 ($info[2] == IMAGETYPE_GIF && !function_exists('imagecreatefromgif')) ||
66 ($info[2] == IMAGETYPE_JPEG && !function_exists('imagecreatefromjpeg')) ||
67 ($info[2] == IMAGETYPE_WBMP && !function_exists('imagecreatefromwbmp')) ||
68 ($info[2] == IMAGETYPE_XBM && !function_exists('imagecreatefromxbm')) ||
69 ($info[2] == IMAGETYPE_PNG && !function_exists('imagecreatefrompng'))) {
71 // TRANS: Exception thrown when trying to upload an unsupported image file format.
72 throw new UnsupportedMediaException(_('Unsupported image format.'), $this->filepath);
75 $this->type = ($info) ? $info[2]:$type;
76 $this->width = ($info) ? $info[0]:$width;
77 $this->height = ($info) ? $info[1]:$height;
79 if ($this->type == IMAGETYPE_JPEG && function_exists('exif_read_data')) {
80 // Orientation value to rotate thumbnails properly
81 $exif = exif_read_data($this->filepath);
82 if (is_array($exif) && isset($exif['Orientation'])) {
83 switch ((int)$exif['Orientation']) {
87 case 3: // top is bottom
90 case 6: // top is right
93 case 8: // top is left
97 // If we ever write this back, Orientation should be set to '1'
101 Event::handle('FillImageFileMetadata', array($this));
104 public static function fromFileObject(File $file)
107 $media = common_get_mime_media($file->mimetype);
108 if (Event::handle('CreateFileImageThumbnailSource', array($file, &$imgPath, $media))) {
111 $imgPath = $file->getPath();
114 throw new UnsupportedMediaException(_('Unsupported media format.'), $file->getPath());
118 if (!file_exists($imgPath)) {
119 throw new ServerException(sprintf('Image not available locally: %s', $imgPath));
123 $image = new ImageFile($file->id, $imgPath);
124 } catch (UnsupportedMediaException $e) {
125 // Avoid deleting the original
126 if ($imgPath != $file->getPath()) {
134 public function getPath()
136 if (!file_exists($this->filepath)) {
137 throw new ServerException('No file in ImageFile filepath');
140 return $this->filepath;
143 static function fromUpload($param='upload')
145 switch ($_FILES[$param]['error']) {
146 case UPLOAD_ERR_OK: // success, jump out
149 case UPLOAD_ERR_INI_SIZE:
150 case UPLOAD_ERR_FORM_SIZE:
151 // TRANS: Exception thrown when too large a file is uploaded.
152 // TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
153 throw new Exception(sprintf(_('That file is too big. The maximum file size is %s.'), ImageFile::maxFileSize()));
155 case UPLOAD_ERR_PARTIAL:
156 @unlink($_FILES[$param]['tmp_name']);
157 // TRANS: Exception thrown when uploading an image and that action could not be completed.
158 throw new Exception(_('Partial upload.'));
160 case UPLOAD_ERR_NO_FILE:
161 // No file; probably just a non-AJAX submission.
163 common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " . $_FILES[$param]['error']);
164 // TRANS: Exception thrown when uploading an image fails for an unknown reason.
165 throw new Exception(_('System error uploading file.'));
168 $info = @getimagesize($_FILES[$param]['tmp_name']);
171 @unlink($_FILES[$param]['tmp_name']);
172 // TRANS: Exception thrown when uploading a file as image that is not an image or is a corrupt file.
173 throw new UnsupportedMediaException(_('Not an image or corrupt file.'), '[deleted]');
176 return new ImageFile(null, $_FILES[$param]['tmp_name']);
180 * Compat interface for old code generating avatar thumbnails...
181 * Saves the scaled file directly into the avatar area.
183 * @param int $size target width & height -- must be square
184 * @param int $x (default 0) upper-left corner to crop from
185 * @param int $y (default 0) upper-left corner to crop from
186 * @param int $w (default full) width of image area to crop
187 * @param int $h (default full) height of image area to crop
188 * @return string filename
190 function resize($size, $x = 0, $y = 0, $w = null, $h = null)
192 $targetType = $this->preferredType();
193 $outname = Avatar::filename($this->id,
194 image_type_to_extension($targetType),
197 $outpath = Avatar::path($outname);
198 $this->resizeTo($outpath, array('width'=>$size, 'height'=>$size,
205 * Copy the image file to the given destination.
207 * This function may modify the resulting file. Please use the
208 * returned ImageFile object to read metadata (width, height etc.)
210 * @param string $outpath
211 * @return ImageFile the image stored at target path
213 function copyTo($outpath)
215 return new ImageFile(null, $this->resizeTo($outpath));
219 * Create and save a thumbnail image.
221 * @param string $outpath
222 * @param array $box width, height, boundary box (x,y,w,h) defaults to full image
223 * @return string full local filesystem filename
225 function resizeTo($outpath, array $box=array())
227 $box['width'] = isset($box['width']) ? intval($box['width']) : $this->width;
228 $box['height'] = isset($box['height']) ? intval($box['height']) : $this->height;
229 $box['x'] = isset($box['x']) ? intval($box['x']) : 0;
230 $box['y'] = isset($box['y']) ? intval($box['y']) : 0;
231 $box['w'] = isset($box['w']) ? intval($box['w']) : $this->width;
232 $box['h'] = isset($box['h']) ? intval($box['h']) : $this->height;
234 if (!file_exists($this->filepath)) {
235 // TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
236 throw new Exception(_('Lost our file.'));
239 // Don't rotate/crop/scale if it isn't necessary
240 if ($box['width'] === $this->width
241 && $box['height'] === $this->height
244 && $box['w'] === $this->width
245 && $box['h'] === $this->height
246 && $this->type == $this->preferredType()) {
247 if ($this->rotate == 0) {
248 // No rotational difference, just copy it as-is
249 @copy($this->filepath, $outpath);
251 } elseif (abs($this->rotate) == 90) {
252 // Box is rotated 90 degrees in either direction,
253 // so we have to redefine x to y and vice versa.
254 $tmp = $box['width'];
255 $box['width'] = $box['height'];
256 $box['height'] = $tmp;
258 $box['x'] = $box['y'];
261 $box['w'] = $box['h'];
267 if (Event::handle('StartResizeImageFile', array($this, $outpath, $box))) {
268 $this->resizeToFile($outpath, $box);
271 if (!file_exists($outpath)) {
272 throw new UseFileAsThumbnailException($this->id);
278 protected function resizeToFile($outpath, array $box)
280 switch ($this->type) {
282 $image_src = imagecreatefromgif($this->filepath);
285 $image_src = imagecreatefromjpeg($this->filepath);
288 $image_src = imagecreatefrompng($this->filepath);
291 $image_src = imagecreatefrombmp($this->filepath);
294 $image_src = imagecreatefromwbmp($this->filepath);
297 $image_src = imagecreatefromxbm($this->filepath);
300 // TRANS: Exception thrown when trying to resize an unknown file type.
301 throw new Exception(_('Unknown file type'));
304 if ($this->rotate != 0) {
305 $image_src = imagerotate($image_src, $this->rotate, 0);
308 $image_dest = imagecreatetruecolor($box['width'], $box['height']);
310 if ($this->type == IMAGETYPE_GIF || $this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
312 $transparent_idx = imagecolortransparent($image_src);
314 if ($transparent_idx >= 0) {
316 $transparent_color = imagecolorsforindex($image_src, $transparent_idx);
317 $transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
318 imagefill($image_dest, 0, 0, $transparent_idx);
319 imagecolortransparent($image_dest, $transparent_idx);
321 } elseif ($this->type == IMAGETYPE_PNG) {
323 imagealphablending($image_dest, false);
324 $transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
325 imagefill($image_dest, 0, 0, $transparent);
326 imagesavealpha($image_dest, true);
331 imagecopyresampled($image_dest, $image_src, 0, 0, $box['x'], $box['y'], $box['width'], $box['height'], $box['w'], $box['h']);
333 switch ($this->preferredType()) {
335 imagegif($image_dest, $outpath);
338 imagejpeg($image_dest, $outpath, common_config('image', 'jpegquality'));
341 imagepng($image_dest, $outpath);
344 // TRANS: Exception thrown when trying resize an unknown file type.
345 throw new Exception(_('Unknown file type'));
348 // Always chmod 0644 to have other processes (e.g. queue daemon read it)
349 @chmod($outpath, 0644);
351 imagedestroy($image_src);
352 imagedestroy($image_dest);
357 * Several obscure file types should be normalized to PNG on resize.
359 * @fixme consider flattening anything not GIF or JPEG to PNG
362 function preferredType()
364 if($this->type == IMAGETYPE_BMP) {
365 //we don't want to save BMP... it's an inefficient, rare, antiquated format
367 return IMAGETYPE_PNG;
368 } else if($this->type == IMAGETYPE_WBMP) {
369 //we don't want to save WBMP... it's a rare format that we can't guarantee clients will support
371 return IMAGETYPE_PNG;
372 } else if($this->type == IMAGETYPE_XBM) {
373 //we don't want to save XBM... it's a rare format that we can't guarantee clients will support
375 return IMAGETYPE_PNG;
382 @unlink($this->filepath);
385 static function maxFileSize()
387 $value = ImageFile::maxFileSizeInt();
389 if ($value > 1024 * 1024) {
390 $value = $value/(1024*1024);
391 // TRANS: Number of megabytes. %d is the number.
392 return sprintf(_m('%dMB','%dMB',$value),$value);
393 } else if ($value > 1024) {
394 $value = $value/1024;
395 // TRANS: Number of kilobytes. %d is the number.
396 return sprintf(_m('%dkB','%dkB',$value),$value);
398 // TRANS: Number of bytes. %d is the number.
399 return sprintf(_m('%dB','%dB',$value),$value);
403 static function maxFileSizeInt()
405 return min(ImageFile::strToInt(ini_get('post_max_size')),
406 ImageFile::strToInt(ini_get('upload_max_filesize')),
407 ImageFile::strToInt(ini_get('memory_limit')));
410 static function strToInt($str)
412 $unit = substr($str, -1);
413 $num = substr($str, 0, -1);
415 switch(strtoupper($unit)){
427 public function scaleToFit($maxWidth=null, $maxHeight=null, $crop=null)
429 return self::getScalingValues($this->width, $this->height,
430 $maxWidth, $maxHeight, $crop, $this->rotate);
434 * Gets scaling values for images of various types. Cropping can be enabled.
436 * Values will scale _up_ to fit max values if cropping is enabled!
437 * With cropping disabled, the max value of each axis will be respected.
439 * @param $width int Original width
440 * @param $height int Original height
441 * @param $maxW int Resulting max width
442 * @param $maxH int Resulting max height
443 * @param $crop int Crop to the size (not preserving aspect ratio)
445 public static function getScalingValues($width, $height,
446 $maxW=null, $maxH=null,
447 $crop=null, $rotate=0)
449 $maxW = $maxW ?: common_config('thumbnail', 'width');
450 $maxH = $maxH ?: common_config('thumbnail', 'height');
452 if ($maxW < 1 || ($maxH !== null && $maxH < 1)) {
453 throw new ServerException('Bad parameters for ImageFile::getScalingValues');
454 } elseif ($maxH === null) {
455 // if maxH is null, we set maxH to equal maxW and enable crop
460 // Because GD doesn't understand EXIF orientation etc.
461 if (abs($rotate) == 90) {
467 // Cropping data (for original image size). Default values, 0 and null,
468 // imply no cropping and with preserved aspect ratio (per axis).
471 $cw = null; // crop area width
472 $ch = null; // crop area height
475 $s_ar = $width / $height;
476 $t_ar = $maxW / $maxH;
481 // Source aspect ratio differs from target, recalculate crop points!
483 $cx = floor($width / 2 - $height * $t_ar / 2);
484 $cw = ceil($height * $t_ar);
485 } elseif ($s_ar < $t_ar) {
486 $cy = floor($height / 2 - $width / $t_ar / 2);
487 $ch = ceil($width / $t_ar);
491 $rh = ceil($height * $rw / $width);
493 // Scaling caused too large height, decrease to max accepted value
496 $rw = ceil($width * $rh / $height);
499 return array(intval($rw), intval($rh),
500 intval($cx), intval($cy),
501 is_null($cw) ? $width : intval($cw),
502 is_null($ch) ? $height : intval($ch));
506 //PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
507 if(!function_exists('imagecreatefrombmp')){
508 //taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
509 function imagecreatefrombmp($p_sFile)
511 // Load the image into a string
512 $file = fopen($p_sFile,"rb");
513 $read = fread($file,10);
514 while(!feof($file)&&($read<>""))
515 $read .= fread($file,1024);
517 $temp = unpack("H*",$read);
519 $header = substr($hex,0,108);
521 // Process the header
522 // Structure: http://www.fastgraph.com/help/bmp_header_format.html
523 if (substr($header,0,4)=="424d")
525 // Cut it in parts of 2 bytes
526 $header_parts = str_split($header,2);
528 // Get the width 4 bytes
529 $width = hexdec($header_parts[19].$header_parts[18]);
531 // Get the height 4 bytes
532 $height = hexdec($header_parts[23].$header_parts[22]);
534 // Unset the header params
535 unset($header_parts);
538 // Define starting X and Y
543 $image = imagecreatetruecolor($width,$height);
545 // Grab the body from the image
546 $body = substr($hex,108);
548 // Calculate if padding at the end-line is needed
549 // Divided by two to keep overview.
550 // 1 byte = 2 HEX-chars
551 $body_size = (strlen($body)/2);
552 $header_size = ($width*$height);
554 // Use end-line padding? Only when needed
555 $usePadding = ($body_size>($header_size*3)+4);
557 // Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
558 // Calculate the next DWORD-position in the body
559 for ($i=0;$i<$body_size;$i+=3)
561 // Calculate line-ending and padding
564 // If padding needed, ignore image-padding
565 // Shift i to the ending of the current 32-bit-block
569 // Reset horizontal position
572 // Raise the height-position (bottom-up)
575 // Reached the image-height? Break the for-loop
580 // Calculation of the RGB-pixel (defined as BGR in image-data)
581 // Define $i_pos as absolute position in the body
583 $r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
584 $g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
585 $b = hexdec($body[$i_pos].$body[$i_pos+1]);
587 // Calculate and draw the pixel
588 $color = imagecolorallocate($image,$r,$g,$b);
589 imagesetpixel($image,$x,$height-$y,$color);
591 // Raise the horizontal position
595 // Unset the body / free the memory
598 // Return image-object
601 } // if(!function_exists('imagecreatefrombmp'))