294 lines
8.7 KiB
PHP
294 lines
8.7 KiB
PHP
<?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/>.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* 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.
|
|
/**
|
|
* @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($imageref = null) {
|
|
OC_Log::write('core','OC_Image::__construct, start', OC_Log::DEBUG);
|
|
if(!function_exists('imagecreatefromjpeg')) { // FIXME: Find a better way to check for GD
|
|
OC_Log::write('core','OC_Image::__construct, GD module not installed', OC_Log::ERROR);
|
|
return false;
|
|
}
|
|
if(!is_null($imageref)) {
|
|
self::load($imageref);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Destructor.
|
|
*/
|
|
function __destruct() {
|
|
if(self::$resource && self::$destroy) {
|
|
imagedestroy(self::$resource); // Why does this issue a warning.
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Prints the image.
|
|
*/
|
|
public function show() {
|
|
header('Content-Type: image/png');
|
|
imagepng(self::$resource);
|
|
}
|
|
|
|
/**
|
|
* @brief Prints the image when called as $image().
|
|
*/
|
|
public function __invoke() {
|
|
self::show();
|
|
}
|
|
|
|
/**
|
|
* @returns Returns the image resource in any.
|
|
*/
|
|
public function imageResource() {
|
|
return self::$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
|
|
*/
|
|
static public function load($imageref) {
|
|
if(self::loadFromFile($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 $imageref The path to a local file.
|
|
* @returns An image resource or false on error
|
|
*/
|
|
static public function loadFromFile($imagepath=false) {
|
|
if(!is_string($imagepath)) {
|
|
return false;
|
|
}
|
|
if(!is_file($imagepath) || !file_exists($imagepath) || !is_readable($imagepath)) {
|
|
OC_Log::write('core','OC_Image::loadFromFile, couldn\'t load'.$imagepath, OC_Log::DEBUG);
|
|
return false;
|
|
}
|
|
self::$resource = imagecreatefromstring(file_get_contents($imagepath));
|
|
self::$destroy = true;
|
|
return self::$resource;
|
|
}
|
|
|
|
/**
|
|
* @brief Loads an image from a string of data.
|
|
* @param $str A string of image data as read from a file.
|
|
* @returns An image resource or false on error
|
|
*/
|
|
static public function loadFromData($str) {
|
|
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 $str A string base64 encoded string of image data.
|
|
* @returns An image resource or false on error
|
|
*/
|
|
static public function loadFromBase64($str) {
|
|
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 $res An image resource.
|
|
* @returns An image resource or false on error
|
|
*/
|
|
static public function loadFromResource($res) {
|
|
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;
|
|
}
|
|
$width_orig=imageSX(self::$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;
|
|
}
|
|
}
|