641 lines
23 KiB
PHP
641 lines
23 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Abstraction for an image file
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Image
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @author Zach Copley <zach@status.net>
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* @copyright 2008-2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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/**
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* A wrapper on uploaded files
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*
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* Makes it slightly easier to accept an image file from upload.
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*
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* @category Image
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @author Zach Copley <zach@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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class ImageFile
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{
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var $id;
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var $filepath;
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var $filename;
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var $type;
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var $height;
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var $width;
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var $rotate=0; // degrees to rotate for properly oriented image (extrapolated from EXIF etc.)
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var $animated = null; // Animated image? (has more than 1 frame). null means untested
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function __construct($id=null, $filepath=null, $type=null, $width=null, $height=null)
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{
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$this->id = $id;
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$this->filepath = $filepath;
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$this->filename = basename($filepath);
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$info = @getimagesize($this->filepath);
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if (!(
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($info[2] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) ||
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($info[2] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) ||
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$info[2] == IMAGETYPE_BMP ||
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($info[2] == IMAGETYPE_WBMP && function_exists('imagecreatefromwbmp')) ||
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($info[2] == IMAGETYPE_XBM && function_exists('imagecreatefromxbm')) ||
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($info[2] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')))) {
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// TRANS: Exception thrown when trying to upload an unsupported image file format.
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throw new UnsupportedMediaException(_('Unsupported image format.'), $this->filepath);
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}
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$this->type = ($info) ? $info[2]:$type;
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$this->width = ($info) ? $info[0]:$width;
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$this->height = ($info) ? $info[1]:$height;
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if ($this->type == IMAGETYPE_JPEG && function_exists('exif_read_data')) {
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// Orientation value to rotate thumbnails properly
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$exif = exif_read_data($this->filepath);
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if (is_array($exif) && isset($exif['Orientation'])) {
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switch ((int)$exif['Orientation']) {
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case 1: // top is top
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$this->rotate = 0;
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break;
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case 3: // top is bottom
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$this->rotate = 180;
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break;
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case 6: // top is right
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$this->rotate = -90;
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break;
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case 8: // top is left
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$this->rotate = 90;
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break;
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}
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// If we ever write this back, Orientation should be set to '1'
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}
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} elseif ($this->type === IMAGETYPE_GIF) {
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$this->animated = $this->isAnimatedGif();
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}
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Event::handle('FillImageFileMetadata', array($this));
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}
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public static function fromFileObject(File $file)
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{
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$imgPath = null;
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$media = common_get_mime_media($file->mimetype);
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if (Event::handle('CreateFileImageThumbnailSource', array($file, &$imgPath, $media))) {
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if (empty($file->filename)) {
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throw new UnsupportedMediaException(_('File without filename could not get a thumbnail source.'));
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}
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switch ($media) {
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case 'image':
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$imgPath = $file->getPath();
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break;
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default:
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throw new UnsupportedMediaException(_('Unsupported media format.'), $file->getPath());
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}
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}
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if (!file_exists($imgPath)) {
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throw new ServerException(sprintf('Image not available locally: %s', $imgPath));
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}
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try {
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$image = new ImageFile($file->id, $imgPath);
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} catch (UnsupportedMediaException $e) {
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// Avoid deleting the original
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if ($imgPath != $file->getPath()) {
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unlink($imgPath);
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}
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throw $e;
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}
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return $image;
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}
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public function getPath()
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{
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if (!file_exists($this->filepath)) {
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throw new ServerException('No file in ImageFile filepath');
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}
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return $this->filepath;
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}
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static function fromUpload($param='upload')
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{
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switch ($_FILES[$param]['error']) {
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case UPLOAD_ERR_OK: // success, jump out
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break;
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case UPLOAD_ERR_INI_SIZE:
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case UPLOAD_ERR_FORM_SIZE:
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// TRANS: Exception thrown when too large a file is uploaded.
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// TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
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throw new Exception(sprintf(_('That file is too big. The maximum file size is %s.'), ImageFile::maxFileSize()));
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case UPLOAD_ERR_PARTIAL:
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@unlink($_FILES[$param]['tmp_name']);
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// TRANS: Exception thrown when uploading an image and that action could not be completed.
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throw new Exception(_('Partial upload.'));
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case UPLOAD_ERR_NO_FILE:
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// No file; probably just a non-AJAX submission.
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default:
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common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " . $_FILES[$param]['error']);
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// TRANS: Exception thrown when uploading an image fails for an unknown reason.
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throw new Exception(_('System error uploading file.'));
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}
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$info = @getimagesize($_FILES[$param]['tmp_name']);
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if (!$info) {
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@unlink($_FILES[$param]['tmp_name']);
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// TRANS: Exception thrown when uploading a file as image that is not an image or is a corrupt file.
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throw new UnsupportedMediaException(_('Not an image or corrupt file.'), '[deleted]');
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}
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return new ImageFile(null, $_FILES[$param]['tmp_name']);
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}
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/**
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* Compat interface for old code generating avatar thumbnails...
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* Saves the scaled file directly into the avatar area.
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*
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* @param int $size target width & height -- must be square
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* @param int $x (default 0) upper-left corner to crop from
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* @param int $y (default 0) upper-left corner to crop from
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* @param int $w (default full) width of image area to crop
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* @param int $h (default full) height of image area to crop
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* @return string filename
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*/
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function resize($size, $x = 0, $y = 0, $w = null, $h = null)
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{
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$targetType = $this->preferredType();
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$outname = Avatar::filename($this->id,
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image_type_to_extension($targetType),
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$size,
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common_timestamp());
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$outpath = Avatar::path($outname);
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$this->resizeTo($outpath, array('width'=>$size, 'height'=>$size,
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'x'=>$x, 'y'=>$y,
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'w'=>$w, 'h'=>$h));
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return $outname;
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}
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/**
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* Copy the image file to the given destination.
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*
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* This function may modify the resulting file. Please use the
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* returned ImageFile object to read metadata (width, height etc.)
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*
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* @param string $outpath
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* @return ImageFile the image stored at target path
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*/
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function copyTo($outpath)
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{
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return new ImageFile(null, $this->resizeTo($outpath));
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}
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/**
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* Create and save a thumbnail image.
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*
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* @param string $outpath
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* @param array $box width, height, boundary box (x,y,w,h) defaults to full image
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* @return string full local filesystem filename
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*/
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function resizeTo($outpath, array $box=array())
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{
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$box['width'] = isset($box['width']) ? intval($box['width']) : $this->width;
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$box['height'] = isset($box['height']) ? intval($box['height']) : $this->height;
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$box['x'] = isset($box['x']) ? intval($box['x']) : 0;
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$box['y'] = isset($box['y']) ? intval($box['y']) : 0;
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$box['w'] = isset($box['w']) ? intval($box['w']) : $this->width;
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$box['h'] = isset($box['h']) ? intval($box['h']) : $this->height;
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if (!file_exists($this->filepath)) {
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// TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
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throw new Exception(_('Lost our file.'));
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}
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// Don't rotate/crop/scale if it isn't necessary
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if ($box['width'] === $this->width
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&& $box['height'] === $this->height
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&& $box['x'] === 0
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&& $box['y'] === 0
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&& $box['w'] === $this->width
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&& $box['h'] === $this->height
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&& $this->type == $this->preferredType()) {
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if ($this->rotate == 0) {
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// No rotational difference, just copy it as-is
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@copy($this->filepath, $outpath);
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return $outpath;
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} elseif (abs($this->rotate) == 90) {
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// Box is rotated 90 degrees in either direction,
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// so we have to redefine x to y and vice versa.
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$tmp = $box['width'];
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$box['width'] = $box['height'];
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$box['height'] = $tmp;
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$tmp = $box['x'];
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$box['x'] = $box['y'];
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$box['y'] = $tmp;
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$tmp = $box['w'];
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$box['w'] = $box['h'];
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$box['h'] = $tmp;
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}
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}
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if (Event::handle('StartResizeImageFile', array($this, $outpath, $box))) {
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$this->resizeToFile($outpath, $box);
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}
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if (!file_exists($outpath)) {
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throw new UseFileAsThumbnailException($this->id);
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}
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return $outpath;
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}
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protected function resizeToFile($outpath, array $box)
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{
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switch ($this->type) {
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case IMAGETYPE_GIF:
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$image_src = imagecreatefromgif($this->filepath);
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break;
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case IMAGETYPE_JPEG:
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$image_src = imagecreatefromjpeg($this->filepath);
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break;
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case IMAGETYPE_PNG:
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$image_src = imagecreatefrompng($this->filepath);
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break;
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case IMAGETYPE_BMP:
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$image_src = imagecreatefrombmp($this->filepath);
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break;
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case IMAGETYPE_WBMP:
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$image_src = imagecreatefromwbmp($this->filepath);
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break;
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case IMAGETYPE_XBM:
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$image_src = imagecreatefromxbm($this->filepath);
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break;
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default:
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// TRANS: Exception thrown when trying to resize an unknown file type.
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throw new Exception(_('Unknown file type'));
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}
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if ($this->rotate != 0) {
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$image_src = imagerotate($image_src, $this->rotate, 0);
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}
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$image_dest = imagecreatetruecolor($box['width'], $box['height']);
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if ($this->type == IMAGETYPE_GIF || $this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
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$transparent_idx = imagecolortransparent($image_src);
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if ($transparent_idx >= 0) {
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$transparent_color = imagecolorsforindex($image_src, $transparent_idx);
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$transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
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imagefill($image_dest, 0, 0, $transparent_idx);
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imagecolortransparent($image_dest, $transparent_idx);
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} elseif ($this->type == IMAGETYPE_PNG) {
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imagealphablending($image_dest, false);
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$transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
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imagefill($image_dest, 0, 0, $transparent);
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imagesavealpha($image_dest, true);
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}
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}
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imagecopyresampled($image_dest, $image_src, 0, 0, $box['x'], $box['y'], $box['width'], $box['height'], $box['w'], $box['h']);
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switch ($this->preferredType()) {
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case IMAGETYPE_GIF:
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imagegif($image_dest, $outpath);
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break;
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case IMAGETYPE_JPEG:
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imagejpeg($image_dest, $outpath, common_config('image', 'jpegquality'));
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break;
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case IMAGETYPE_PNG:
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imagepng($image_dest, $outpath);
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break;
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default:
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// TRANS: Exception thrown when trying resize an unknown file type.
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throw new Exception(_('Unknown file type'));
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}
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imagedestroy($image_src);
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imagedestroy($image_dest);
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}
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/**
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* Several obscure file types should be normalized to PNG on resize.
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*
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* @fixme consider flattening anything not GIF or JPEG to PNG
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* @return int
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*/
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function preferredType()
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{
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if($this->type == IMAGETYPE_BMP) {
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//we don't want to save BMP... it's an inefficient, rare, antiquated format
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//save png instead
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return IMAGETYPE_PNG;
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} else if($this->type == IMAGETYPE_WBMP) {
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//we don't want to save WBMP... it's a rare format that we can't guarantee clients will support
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//save png instead
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return IMAGETYPE_PNG;
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} else if($this->type == IMAGETYPE_XBM) {
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//we don't want to save XBM... it's a rare format that we can't guarantee clients will support
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//save png instead
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return IMAGETYPE_PNG;
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}
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return $this->type;
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}
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function unlink()
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{
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@unlink($this->filepath);
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}
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static function maxFileSize()
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{
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$value = ImageFile::maxFileSizeInt();
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if ($value > 1024 * 1024) {
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$value = $value/(1024*1024);
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// TRANS: Number of megabytes. %d is the number.
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return sprintf(_m('%dMB','%dMB',$value),$value);
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} else if ($value > 1024) {
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$value = $value/1024;
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// TRANS: Number of kilobytes. %d is the number.
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return sprintf(_m('%dkB','%dkB',$value),$value);
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} else {
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// TRANS: Number of bytes. %d is the number.
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return sprintf(_m('%dB','%dB',$value),$value);
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}
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}
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static function maxFileSizeInt()
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{
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return min(ImageFile::strToInt(ini_get('post_max_size')),
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ImageFile::strToInt(ini_get('upload_max_filesize')),
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ImageFile::strToInt(ini_get('memory_limit')));
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}
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static function strToInt($str)
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{
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$unit = substr($str, -1);
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$num = substr($str, 0, -1);
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switch(strtoupper($unit)){
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case 'G':
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$num *= 1024;
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case 'M':
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$num *= 1024;
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case 'K':
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$num *= 1024;
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}
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return $num;
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}
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public function scaleToFit($maxWidth=null, $maxHeight=null, $crop=null)
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{
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return self::getScalingValues($this->width, $this->height,
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$maxWidth, $maxHeight, $crop, $this->rotate);
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}
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/*
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* Gets scaling values for images of various types. Cropping can be enabled.
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*
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* Values will scale _up_ to fit max values if cropping is enabled!
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* With cropping disabled, the max value of each axis will be respected.
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*
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* @param $width int Original width
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* @param $height int Original height
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* @param $maxW int Resulting max width
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* @param $maxH int Resulting max height
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* @param $crop int Crop to the size (not preserving aspect ratio)
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*/
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public static function getScalingValues($width, $height,
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$maxW=null, $maxH=null,
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$crop=null, $rotate=0)
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{
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$maxW = $maxW ?: common_config('thumbnail', 'width');
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$maxH = $maxH ?: common_config('thumbnail', 'height');
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if ($maxW < 1 || ($maxH !== null && $maxH < 1)) {
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throw new ServerException('Bad parameters for ImageFile::getScalingValues');
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} elseif ($maxH === null) {
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// if maxH is null, we set maxH to equal maxW and enable crop
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$maxH = $maxW;
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$crop = true;
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}
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// Because GD doesn't understand EXIF orientation etc.
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if (abs($rotate) == 90) {
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$tmp = $width;
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$width = $height;
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$height = $tmp;
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}
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// Cropping data (for original image size). Default values, 0 and null,
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// imply no cropping and with preserved aspect ratio (per axis).
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$cx = 0; // crop x
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$cy = 0; // crop y
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$cw = null; // crop area width
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$ch = null; // crop area height
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if ($crop) {
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$s_ar = $width / $height;
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$t_ar = $maxW / $maxH;
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$rw = $maxW;
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$rh = $maxH;
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// Source aspect ratio differs from target, recalculate crop points!
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if ($s_ar > $t_ar) {
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$cx = floor($width / 2 - $height * $t_ar / 2);
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$cw = ceil($height * $t_ar);
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} elseif ($s_ar < $t_ar) {
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$cy = floor($height / 2 - $width / $t_ar / 2);
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$ch = ceil($width / $t_ar);
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}
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} else {
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$rw = $maxW;
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$rh = ceil($height * $rw / $width);
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// Scaling caused too large height, decrease to max accepted value
|
|
if ($rh > $maxH) {
|
|
$rh = $maxH;
|
|
$rw = ceil($width * $rh / $height);
|
|
}
|
|
}
|
|
return array(intval($rw), intval($rh),
|
|
intval($cx), intval($cy),
|
|
is_null($cw) ? $width : intval($cw),
|
|
is_null($ch) ? $height : intval($ch));
|
|
}
|
|
|
|
/**
|
|
* Animated GIF test, courtesy of frank at huddler dot com et al:
|
|
* http://php.net/manual/en/function.imagecreatefromgif.php#104473
|
|
* Modified so avoid landing inside of a header (and thus not matching our regexp).
|
|
*/
|
|
protected function isAnimatedGif()
|
|
{
|
|
if (!($fh = @fopen($this->filepath, 'rb'))) {
|
|
return false;
|
|
}
|
|
|
|
$count = 0;
|
|
//an animated gif contains multiple "frames", with each frame having a
|
|
//header made up of:
|
|
// * a static 4-byte sequence (\x00\x21\xF9\x04)
|
|
// * 4 variable bytes
|
|
// * a static 2-byte sequence (\x00\x2C)
|
|
// In total the header is maximum 10 bytes.
|
|
|
|
// We read through the file til we reach the end of the file, or we've found
|
|
// at least 2 frame headers
|
|
while(!feof($fh) && $count < 2) {
|
|
$chunk = fread($fh, 1024 * 100); //read 100kb at a time
|
|
$count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);
|
|
// rewind in case we ended up in the middle of the header, but avoid
|
|
// infinite loop (i.e. don't rewind if we're already in the end).
|
|
if (!feof($fh) && ftell($fh) >= 9) {
|
|
fseek($fh, -9, SEEK_CUR);
|
|
}
|
|
}
|
|
|
|
fclose($fh);
|
|
return $count > 1;
|
|
}
|
|
}
|
|
|
|
//PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
|
|
if(!function_exists('imagecreatefrombmp')){
|
|
//taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
|
|
function imagecreatefrombmp($p_sFile)
|
|
{
|
|
// Load the image into a string
|
|
$file = fopen($p_sFile,"rb");
|
|
$read = fread($file,10);
|
|
while(!feof($file)&&($read<>""))
|
|
$read .= fread($file,1024);
|
|
|
|
$temp = unpack("H*",$read);
|
|
$hex = $temp[1];
|
|
$header = substr($hex,0,108);
|
|
|
|
// Process the header
|
|
// Structure: http://www.fastgraph.com/help/bmp_header_format.html
|
|
if (substr($header,0,4)=="424d")
|
|
{
|
|
// Cut it in parts of 2 bytes
|
|
$header_parts = str_split($header,2);
|
|
|
|
// Get the width 4 bytes
|
|
$width = hexdec($header_parts[19].$header_parts[18]);
|
|
|
|
// Get the height 4 bytes
|
|
$height = hexdec($header_parts[23].$header_parts[22]);
|
|
|
|
// Unset the header params
|
|
unset($header_parts);
|
|
}
|
|
|
|
// Define starting X and Y
|
|
$x = 0;
|
|
$y = 1;
|
|
|
|
// Create newimage
|
|
$image = imagecreatetruecolor($width,$height);
|
|
|
|
// Grab the body from the image
|
|
$body = substr($hex,108);
|
|
|
|
// Calculate if padding at the end-line is needed
|
|
// Divided by two to keep overview.
|
|
// 1 byte = 2 HEX-chars
|
|
$body_size = (strlen($body)/2);
|
|
$header_size = ($width*$height);
|
|
|
|
// Use end-line padding? Only when needed
|
|
$usePadding = ($body_size>($header_size*3)+4);
|
|
|
|
// Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
|
|
// Calculate the next DWORD-position in the body
|
|
for ($i=0;$i<$body_size;$i+=3)
|
|
{
|
|
// Calculate line-ending and padding
|
|
if ($x>=$width)
|
|
{
|
|
// If padding needed, ignore image-padding
|
|
// Shift i to the ending of the current 32-bit-block
|
|
if ($usePadding)
|
|
$i += $width%4;
|
|
|
|
// Reset horizontal position
|
|
$x = 0;
|
|
|
|
// Raise the height-position (bottom-up)
|
|
$y++;
|
|
|
|
// Reached the image-height? Break the for-loop
|
|
if ($y>$height)
|
|
break;
|
|
}
|
|
|
|
// Calculation of the RGB-pixel (defined as BGR in image-data)
|
|
// Define $i_pos as absolute position in the body
|
|
$i_pos = $i*2;
|
|
$r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
|
|
$g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
|
|
$b = hexdec($body[$i_pos].$body[$i_pos+1]);
|
|
|
|
// Calculate and draw the pixel
|
|
$color = imagecolorallocate($image,$r,$g,$b);
|
|
imagesetpixel($image,$x,$height-$y,$color);
|
|
|
|
// Raise the horizontal position
|
|
$x++;
|
|
}
|
|
|
|
// Unset the body / free the memory
|
|
unset($body);
|
|
|
|
// Return image-object
|
|
return $image;
|
|
}
|
|
} // if(!function_exists('imagecreatefrombmp'))
|