forked from GNUsocial/gnu-social
d59eb5e184
The File object now stores width and height of files that can supply this kind of information. Formats which we can not read natively in PHP do not currently benefit from this. However an event hook will be introduced later. The CreateFileImageThumbnail event is renamed to: CreateFileImageThumbnailSource to clarify that the hooks should not generate their own thumbnails but only the source image. Also it now accepts File objects, not MediaFile objects. The thumbnail generation is documented in the source code. For developers, call 'getThumbnail' on a File object and hope for the best. Default thumbnail sizes have increased to be more appealing.
505 lines
18 KiB
PHP
505 lines
18 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 $barename;
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var $type;
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var $height;
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var $width;
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function __construct($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 = $filepath;
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$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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}
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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, $size, $size, $x, $y, $w, $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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* For obscure formats, this will automatically convert to PNG;
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* otherwise the original file will be copied as-is.
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*
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* @param string $outpath
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* @return string filename
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*/
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function copyTo($outpath)
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{
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return $this->resizeTo($outpath, $this->width, $this->height);
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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 int $width target width
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* @param int $height target height
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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 $h (default full) height of image area to crop
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* @return string full local filesystem filename
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*/
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function resizeTo($outpath, $width, $height, $x=0, $y=0, $w=null, $h=null)
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{
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$w = ($w === null) ? $this->width:$w;
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$h = ($h === null) ? $this->height:$h;
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$targetType = $this->preferredType();
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if (!file_exists($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 crop/scale if it isn't necessary
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if ($width === $this->width
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&& $height === $this->height
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&& $x === 0
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&& $y === 0
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&& $w === $this->width
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&& $h === $this->height
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&& $this->type == $targetType) {
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@copy($this->filepath, $outpath);
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return $outpath;
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}
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switch ($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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$image_dest = imagecreatetruecolor($width, $height);
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if ($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, $x, $y, $width, $height, $w, $h);
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switch ($targetType) {
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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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return $outpath;
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}
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/**
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* Several obscure file types should be normalized to PNG on resize.
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*
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* @fixme consider flattening anything not GIF or JPEG to PNG
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* @return int
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*/
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function preferredType()
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{
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if($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);
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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)
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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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// 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 / $width);
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// Scaling caused too large height, decrease to max accepted value
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if ($rh > $maxH) {
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$rh = $maxH;
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$rw = ceil($width * $rh / $height);
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}
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}
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return array(intval($rw), intval($rh),
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intval($cx), intval($cy),
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is_null($cw) ? null : intval($cw),
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is_null($ch) ? null : intval($ch));
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}
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}
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//PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
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if(!function_exists('imagecreatefrombmp')){
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//taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
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function imagecreatefrombmp($p_sFile)
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{
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// Load the image into a string
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$file = fopen($p_sFile,"rb");
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$read = fread($file,10);
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while(!feof($file)&&($read<>""))
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$read .= fread($file,1024);
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$temp = unpack("H*",$read);
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$hex = $temp[1];
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$header = substr($hex,0,108);
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// Process the header
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// Structure: http://www.fastgraph.com/help/bmp_header_format.html
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if (substr($header,0,4)=="424d")
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{
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// Cut it in parts of 2 bytes
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$header_parts = str_split($header,2);
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// Get the width 4 bytes
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$width = hexdec($header_parts[19].$header_parts[18]);
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// Get the height 4 bytes
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$height = hexdec($header_parts[23].$header_parts[22]);
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// Unset the header params
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unset($header_parts);
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}
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// Define starting X and Y
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$x = 0;
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$y = 1;
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// Create newimage
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$image = imagecreatetruecolor($width,$height);
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// Grab the body from the image
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$body = substr($hex,108);
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// Calculate if padding at the end-line is needed
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// Divided by two to keep overview.
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// 1 byte = 2 HEX-chars
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$body_size = (strlen($body)/2);
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$header_size = ($width*$height);
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// Use end-line padding? Only when needed
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$usePadding = ($body_size>($header_size*3)+4);
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// Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
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// Calculate the next DWORD-position in the body
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for ($i=0;$i<$body_size;$i+=3)
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{
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// Calculate line-ending and padding
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if ($x>=$width)
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{
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// If padding needed, ignore image-padding
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// Shift i to the ending of the current 32-bit-block
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if ($usePadding)
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$i += $width%4;
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// Reset horizontal position
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$x = 0;
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// Raise the height-position (bottom-up)
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$y++;
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// Reached the image-height? Break the for-loop
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if ($y>$height)
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break;
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}
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// Calculation of the RGB-pixel (defined as BGR in image-data)
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// Define $i_pos as absolute position in the body
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$i_pos = $i*2;
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$r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
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$g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
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$b = hexdec($body[$i_pos].$body[$i_pos+1]);
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// Calculate and draw the pixel
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$color = imagecolorallocate($image,$r,$g,$b);
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imagesetpixel($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'))
|