<?php
/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/
class SimpleImage {
var $image;
var $image_type;
var $image_w;
var $image_h;
function load($filename) {
$image_info = getimagesize($filename);
$this->image_w = $image_info[0];
$this->image_h = $image_info[1];
$this->image_type = $image_info[2];
if(ini_get('memory_limit')<100)
ini_set('memory_limit','100M');
if( $this->image_type == IMAGETYPE_JPEG ) {
$this->image = imagecreatefromjpeg($filename);
} elseif( $this->image_type == IMAGETYPE_GIF ) {
$this->image = imagecreatefromgif($filename);
} elseif( $this->image_type == IMAGETYPE_PNG ) {
$this->image = imagecreatefrompng($filename);
}
}
function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
if( $image_type == IMAGETYPE_JPEG ) {
imagejpeg($this->image,$filename,$compression);
} elseif( $image_type == IMAGETYPE_GIF ) {
imagegif($this->image,$filename);
} elseif( $image_type == IMAGETYPE_PNG ) {
imagepng($this->image,$filename);
}
if( $permissions != null) {
chmod($filename,$permissions);
}
}
function output($image_type=IMAGETYPE_JPEG) {
if( $image_type == IMAGETYPE_JPEG ) {
imagejpeg($this->image);
} elseif( $image_type == IMAGETYPE_GIF ) {
imagegif($this->image);
} elseif( $image_type == IMAGETYPE_PNG ) {
imagepng($this->image);
}
}
function getWidth() {
return imagesx($this->image);
}
function getHeight() {
return imagesy($this->image);
}
function resizeToHeight($height,$upscaleAllowed=true) {
if(!$upscaleAllowed && $height >= $this->image_h ) return; //don't upscale
$ratio = $height / $this->getHeight();
$width = $this->getWidth() * $ratio;
$this->resize($width,$height);
}
function resizeToWidth($width,$upscaleAllowed=true) {
if(!$upscaleAllowed && $width >= $this->image_w) return; //don't upscale
$ratio = $width / $this->getWidth();
$height = $this->getheight() * $ratio;
$this->resize($width,$height);
}
function scale($scale) {
$width = $this->getWidth() * $scale/100;
$height = $this->getheight() * $scale/100;
$this->resize($width,$height);
}
function resize($width,$height) {
$new_image = imagecreatetruecolor($width, $height);
$this->setTransparency($new_image); //Joe: this is commented, as turned out that this code breaks the background
//miro not commented anymore as turned out media lib saves all images as JPG (with .png extension)
imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
$this->image = $new_image;
}
function setTransparency(&$image_p)
{
if($this->image_type == IMAGETYPE_GIF)
{
$trnprt_indx=imagecolortransparent($this->image);
if($trnprt_indx>=0)
{
$trnprt_color=imagecolorsforindex($this->image,$trnprt_indx);
$trnprt_indx=imagecolorallocate($image_p,$trnprt_color['red'],$trnprt_color['green'],$trnprt_color['blue']);
imagefill($image_p,0,0,$trnprt_indx);
imagecolortransparent($image_p,$trnprt_indx);
}
}
elseif($this->image_type==IMAGETYPE_PNG)
{
imagealphablending($image_p,false);
$color=imagecolorallocatealpha($image_p,0,0,0,127);
imagefill($image_p,0,0,$color);
imagesavealpha($image_p,true);
}
return;
}
}
?>