nextcloud/lib/image.php

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<?php
/**
* ownCloud
*
* @author Thomas Tanghus
* @copyright 2011 Thomas Tanghus <thomas@tanghus.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
/** From user comments at http://dk2.php.net/manual/en/function.exif-imagetype.php
* Don't know if it can come in handy?
if ( ! function_exists( 'exif_imagetype' ) ) {
function exif_imagetype ( $filename ) {
if ( ( list($width, $height, $type, $attr) = getimagesize( $filename ) ) !== false ) {
return $type;
}
return false;
}
}
*/
function ellipsis($str, $maxlen) {
if (strlen($str) > $maxlen) {
$characters = floor($maxlen / 2);
return substr($str, 0, $characters) . '...' . substr($str, -1 * $characters);
}
return $str;
}
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/**
* Class for image manipulation
* Ideas: imagerotate, chunk_split(base64_encode())
*
*/
class OC_Image {
static private $resource = false; // tmp resource.
static private $destroy = false; // if the resource is created withing the object.
static private $imagetype = IMAGETYPE_PNG; // Default to png if file type isn't evident.
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static private $filepath = null;
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/**
* @brief Constructor.
* @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function.
* If a resource is passed it is the job of the caller to destroy it using imagedestroy($var)
* @returns bool False on error
*/
function __construct($imageref = null) {
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//OC_Log::write('core','OC_Image::__construct, start', OC_Log::DEBUG);
if(!extension_loaded('gd') || !function_exists('gd_info')) {
//if(!function_exists('imagecreatefromjpeg')) {
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OC_Log::write('core','OC_Image::__construct, GD module not installed', OC_Log::ERROR);
return false;
}
if(!is_null($imageref)) {
self::load($imageref);
}
}
/**
* @brief Destructor.
*/
function __destruct() {
if(is_resource(self::$resource) && self::$destroy) {
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imagedestroy(self::$resource); // Why does this issue a warning.
}
}
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/**
* @brief Determine whether the object contains an image resource.
* @returns bool
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*/
public function valid() { // apparently you can't name a method 'empty'...
$ret = is_resource(self::$resource);
return $ret;
}
/**
* @brief Returns the MIME type of the image or an empty string if no image is loaded.
* @returns int
*/
public function mimeType() {
return is_resource(self::$resource) ? image_type_to_mime_type(self::$imagetype) : '';
}
/**
* @brief Returns the width of the image or -1 if no image is loaded.
* @returns int
*/
public function width() {
return is_resource(self::$resource) ? imagesx(self::$resource) : -1;
}
/**
* @brief Returns the height of the image or -1 if no image is loaded.
* @returns int
*/
public function height() {
return is_resource(self::$resource) ? imagesy(self::$resource) : -1;
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}
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/**
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* @brief Outputs the image.
* @returns bool
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*/
public function show() {
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return $this->_output();
}
/**
* @brief Saves the image.
* @returns bool
*/
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public function save($filepath=null) {
if($filepath === null && self::$filepath === null) {
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OC_Log::write('core','OC_Image::save. save() called with no path.', OC_Log::ERROR);
return false;
} elseif($filepath === null && $this->filepath !== null) {
$filepath = $this->filepath;
}
return $this->_output($filepath, true);
}
/**
* @brief Outputs/saves the image.
*/
private function _output($filepath=null, $really=false) {
if($really === false) {
header('Content-Type: '.self::mimeType());
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$filepath = null; // Just being cautious ;-)
} else {
if(!is_writable(dirname($filepath))) {
OC_Log::write('core','OC_Image::_output. Directory \''.dirname($filepath).'\' is not writable.', OC_Log::ERROR);
return false;
} elseif(is_writable(dirname($filepath)) && file_exists($filepath) && !is_writable($filepath)) {
OC_Log::write('core','OC_Image::_output. File \''.$filepath.'\' is not writable.', OC_Log::ERROR);
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return false;
}
}
$retval = false;
switch(self::$imagetype) {
case IMAGETYPE_GIF:
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$retval = imagegif(self::$resource, $filepath);
break;
case IMAGETYPE_JPEG:
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$retval = imagejpeg(self::$resource, $filepath);
break;
case IMAGETYPE_PNG:
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$retval = imagepng(self::$resource, $filepath);
break;
case IMAGETYPE_XBM:
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$retval = imagexbm(self::$resource, $filepath);
break;
case IMAGETYPE_WBMP:
case IMAGETYPE_BMP:
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$retval = imagewbmp(self::$resource, $filepath);
break;
default:
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$retval = imagepng(self::$resource, $filepath);
}
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return $retval;
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}
/**
* @brief Prints the image when called as $image().
*/
public function __invoke() {
return self::show();
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}
/**
* @returns Returns the image resource in any.
*/
public function resource() {
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return self::$resource;
}
/**
* @returns Returns a base64 encoded string suitable for embedding in a VCard.
*/
function __toString() {
ob_start();
$res = imagepng(self::$resource);
if (!$res) {
OC_Log::write('core','OC_Image::_string. Error writing image',OC_Log::ERROR);
}
return chunk_split(base64_encode(ob_get_clean()));
}
/**
* @brief Loads an image from a local file, a base64 encoded string or a resource created by an imagecreate* function.
* @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function.
* If a resource is passed it is the job of the caller to destroy it using imagedestroy($var)
* @returns An image resource or false on error
*/
public function load($imageref) {
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if(self::loadFromFile($imageref) !== false) {
return self::$resource;
} elseif(self::loadFromBase64($imageref) !== false) {
return self::$resource;
} elseif(self::loadFromData($imageref) !== false) {
return self::$resource;
} elseif(self::loadFromResource($imageref) !== false) {
return self::$resource;
} else {
OC_Log::write('core','OC_Image::load, couldn\'t load anything. Giving up!', OC_Log::DEBUG);
return false;
}
}
/**
* @brief Loads an image from a local file.
* @param $imageref The path to a local file.
* @returns An image resource or false on error
*/
public function loadFromFile($imagepath=false) {
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if(!is_file($imagepath) || !file_exists($imagepath) || !is_readable($imagepath)) {
// Debug output disabled because this method is tried before loadFromBase64?
OC_Log::write('core','OC_Image::loadFromFile, couldn\'t load: '.ellipsis($imagepath, 50), OC_Log::DEBUG);
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return false;
}
$itype = exif_imagetype($imagepath);
switch($itype) {
case IMAGETYPE_GIF:
if (imagetypes() & IMG_GIF) {
self::$resource = imagecreatefromgif($imagepath);
} else {
OC_Log::write('core','OC_Image::loadFromFile, GIF images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
case IMAGETYPE_JPEG:
if (imagetypes() & IMG_JPG) {
self::$resource = imagecreatefromjpeg($imagepath);
} else {
OC_Log::write('core','OC_Image::loadFromFile, JPG images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
case IMAGETYPE_PNG:
if (imagetypes() & IMG_PNG) {
self::$resource = imagecreatefrompng($imagepath);
} else {
OC_Log::write('core','OC_Image::loadFromFile, PNG images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
case IMAGETYPE_XBM:
if (imagetypes() & IMG_XPM) {
self::$resource = imagecreatefromxbm($imagepath);
} else {
OC_Log::write('core','OC_Image::loadFromFile, XBM/XPM images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
case IMAGETYPE_WBMP:
case IMAGETYPE_BMP:
if (imagetypes() & IMG_WBMP) {
self::$resource = imagecreatefromwbmp($imagepath);
} else {
OC_Log::write('core','OC_Image::loadFromFile, (W)BMP images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
/*
case IMAGETYPE_TIFF_II: // (intel byte order)
break;
case IMAGETYPE_TIFF_MM: // (motorola byte order)
break;
case IMAGETYPE_JPC:
break;
case IMAGETYPE_JP2:
break;
case IMAGETYPE_JPX:
break;
case IMAGETYPE_JB2:
break;
case IMAGETYPE_SWC:
break;
case IMAGETYPE_IFF:
break;
case IMAGETYPE_ICO:
break;
case IMAGETYPE_SWF:
break;
case IMAGETYPE_PSD:
break;
*/
default:
self::$resource = imagecreatefromstring(file_get_contents($imagepath));
$itype = IMAGETYPE_PNG;
OC_Log::write('core','OC_Image::loadFromFile, Default', OC_Log::DEBUG);
break;
}
if($this->valid()) {
self::$imagetype = $itype;
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self::$filepath = $imagepath;
self::$destroy = true;
}
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return self::$resource;
}
/**
* @brief Loads an image from a string of data.
* @param $str A string of image data as read from a file.
* @returns An image resource or false on error
*/
public function loadFromData($str) {
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if(is_resource($str)) {
return false;
}
self::$resource = imagecreatefromstring($str);
if(!self::$resource) {
OC_Log::write('core','OC_Image::loadFromData, couldn\'t load', OC_Log::DEBUG);
return false;
}
self::$destroy = true;
return self::$resource;
}
/**
* @brief Loads an image from a base64 encoded string.
* @param $str A string base64 encoded string of image data.
* @returns An image resource or false on error
*/
public function loadFromBase64($str) {
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if(!is_string($str)) {
return false;
}
$data = base64_decode($str);
if($data) { // try to load from string data
self::$resource = imagecreatefromstring($data);
if(!self::$resource) {
OC_Log::write('core','OC_Image::loadFromBase64, couldn\'t load', OC_Log::DEBUG);
return false;
}
self::$destroy = true;
return self::$resource;
} else {
return false;
}
}
/**
* @brief Checks if image resource is valid and assigns it to self::$resource.
* @param $res An image resource.
* @returns An image resource or false on error
*/
public function loadFromResource($res) {
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if(!is_resource($res)) {
return false;
}
self::$resource = $res;
}
/**
* @brief Resizes the image preserving ratio.
* @param $maxsize The maximum size of either the width or height.
* @returns bool
*/
public function resize($maxsize) {
if(!self::$resource) {
OC_Log::write('core','OC_Image::resize, No image loaded', OC_Log::ERROR);
return false;
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}
$width_orig=imageSX(self::$resource);
$height_orig=imageSY(self::$resource);
$ratio_orig = $width_orig/$height_orig;
if ($ratio_orig > 1) {
$new_height = round($maxsize/$ratio_orig);
$new_width = $maxsize;
} else {
$new_width = round($maxsize*$ratio_orig);
$new_height = $maxsize;
}
$process = imagecreatetruecolor(round($new_width), round($new_height));
if ($process == false) {
OC_Log::write('core','OC_Image::resize. Error creating true color image',OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagecopyresampled($process, self::$resource, 0, 0, 0, 0, $new_width, $new_height, $width_orig, $height_orig);
if ($process == false) {
OC_Log::write('core','OC_Image::resize. Error resampling process image '.$new_width.'x'.$new_height,OC_Log::ERROR);
imagedestroy($process);
return false;
}
self::$resource = $process;
return true;
}
/**
* @brief Crops the image to the middle square. If the image is already square it just returns.
* @returns bool for success or failure
*/
public function centerCrop() {
if(!self::$resource) {
OC_Log::write('core','OC_Image::centerCrop, No image loaded', OC_Log::ERROR);
return false;
}
$width_orig=imageSX(self::$resource);
$height_orig=imageSY(self::$resource);
if($width_orig === $height_orig) {
return true;
}
$ratio_orig = $width_orig/$height_orig;
$width = $height = min($width_orig, $height_orig);
if ($ratio_orig > 1) {
$x = ($width_orig/2) - ($width/2);
$y = 0;
} else {
$y = ($height_orig/2) - ($height/2);
$x = 0;
}
$process = imagecreatetruecolor($width, $height);
if ($process == false) {
OC_Log::write('core','OC_Image::centerCrop. Error creating true color image',OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagecopyresampled($process, self::$resource, 0, 0, $x, $y, $width, $height, $width, $height);
if ($process == false) {
OC_Log::write('core','OC_Image::centerCrop. Error resampling process image '.$width.'x'.$height,OC_Log::ERROR);
imagedestroy($process);
return false;
}
self::$resource = $process;
return true;
}
/**
* @brief Crops the image from point $x$y with dimension $wx$h.
* @param $x Horizontal position
* @param $y Vertical position
* @param $w Width
* @param $h Hight
* @returns bool for success or failure
*/
public function crop($x, $y, $w, $h) {
if(!self::$resource) {
OC_Log::write('core','OC_Image::crop, No image loaded', OC_Log::ERROR);
return false;
}
$width_orig=imageSX(self::$resource);
$height_orig=imageSY(self::$resource);
//OC_Log::write('core','OC_Image::crop. Original size: '.$width_orig.'x'.$height_orig, OC_Log::DEBUG);
$process = imagecreatetruecolor($w, $h);
if ($process == false) {
OC_Log::write('core','OC_Image::crop. Error creating true color image',OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagecopyresampled($process, self::$resource, 0, 0, $x, $y, $w, $h, $w, $h);
if ($process == false) {
OC_Log::write('core','OC_Image::crop. Error resampling process image '.$w.'x'.$h,OC_Log::ERROR);
imagedestroy($process);
return false;
}
self::$resource = $process;
return true;
}
}