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<?php
// EasyGiant is a PHP framework for creating and managing dynamic content
//
// Copyright (C) 2009 - 2014 Antonio Gallo (info@laboratoriolibero.com)
// See COPYRIGHT.txt and LICENSE.txt.
//
// This file is part of EasyGiant
//
// EasyGiant 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 3 of the License, or
// (at your option) any later version.
//
// EasyGiant 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.
//
// You should have received a copy of the GNU General Public License
// along with EasyGiant. If not, see <http://www.gnu.org/licenses/>.
if (!defined('EG')) die('Direct access not allowed!');
//class to create a thumbnail
class Image_Gd_Thumbnail
{
const DS = DIRECTORY_SEPARATOR;
private $params = array(); //parameters of the object
private $basePath = null; //the path of the folder inside which the images are saved
public function __construct($basePath,$params = null)
{
$finalChar = $basePath[strlen($basePath) - 1];
if (strcmp($finalChar,self::DS) !== 0) $basePath .= self::DS;
$this->basePath = $basePath;
$defaultParams = array(
'imgWidth' => null,
'imgHeight' => null,
'defaultImage' => null,
'cropImage' => 'no',
'horizAlign' => 'left',
'vertAlign' => 'top',
'resample' => 'yes',
'function' => 'none',
'outputFormat' => 'jpeg',
'backgroundColor' => null, //must be hex color
);
//set the $this->params array
if (is_array($params))
{
foreach ($params as $key => $value)
{
$defaultParams[$key] = $value;
}
}
$this->params = $defaultParams;
}
public function getSourceCoordinates($direction, $oldDim, $dim)
{
if ($direction === "x")
{
switch ($this->params['horizAlign'])
{
case 'left':
$coordSrc = 0;
break;
case 'right':
$coordSrc = floor(($oldDim-$dim));
break;
case 'center':
$coordSrc = floor(($oldDim-$dim)/2);
break;
default:
$coordSrc = $this->params['horizAlign'];
}
}
else
{
switch ($this->params['vertAlign'])
{
case 'top':
$coordSrc = 0;
break;
case 'bottom':
$coordSrc = floor(($oldDim-$dim));
break;
case 'center':
$coordSrc = floor(($oldDim-$dim)/2);
break;
default:
$coordSrc = $this->params['vertAlign'];
}
}
return $coordSrc;
}
//create the thumbnail
//$imageName: the name of the file inside $this->basePath
//$outputFile: the name of the output file
public function render($imageFile, $outputFile = null)
{
$imagePath = $this->basePath . basename($imageFile);
if (!file_exists($imagePath) and isset($this->params['defaultImage'])) $imagePath = $this->params['defaultImage'];
$img = null;
$type = 'jpeg';
$contentType = 'image/jpeg';
if (file_exists($imagePath))
{
$extArray = explode('.', $imagePath);
$ext = strtolower(end($extArray));
if (strcmp($ext,'jpg') === 0 or strcmp($ext,'jpeg') === 0) {
$img = @imagecreatefromjpeg($imagePath);
$type = 'jpeg';
$contentType = 'image/jpeg';
} else if (strcmp($ext,'png') === 0) {
$img = @imagecreatefrompng($imagePath);
$type = 'png';
$contentType = 'image/png';
} else if (strcmp($ext,'gif') === 0) {
$img = @imagecreatefromgif($imagePath);
$type = 'gif';
$contentType = 'image/gif';
}
}
//If an image was successfully loaded, test the image for size
if ($img)
{
//image size
$width = imagesx($img);
$height = imagesy($img);
if (!isset($this->params['imgWidth'])) $this->params['imgWidth'] = $width;
if (!isset($this->params['imgHeight'])) $this->params['imgHeight'] = $height;
if ($this->params['cropImage'] === 'no')
{
$scale = min($this->params['imgWidth']/$width, $this->params['imgHeight']/$height);
}
else if ($this->params['cropImage'] === 'yes')
{
$scale = max($this->params['imgWidth']/$width, $this->params['imgHeight']/$height);
}
$xSrc = 0; //x coordinate of source image
$ySrc = 0; //y coordinate of source image
$xDst = 0; //x coordinate of destination image
$yDst = 0; //y coordinate of destination image
if ($this->params['cropImage'] === 'no')
{
if ($scale <= 1)
{
$newWidth = $backWidth = floor($scale*$width);
$newHeight = $backHeight = floor($scale*$height);
if ($this->params['backgroundColor'])
{
$backWidth = $this->params['imgWidth'];
$backHeight = $this->params['imgHeight'];
if ($backWidth > $newWidth)
{
$xDst = floor(($backWidth-$newWidth)/2);
}
else if ($backHeight > $newHeight)
{
$yDst = floor(($backHeight-$newHeight)/2);
}
}
}
else
{
$newWidth = $backWidth = $width;
$newHeight = $backHeight = $height;
if ($this->params['backgroundColor'])
{
$backWidth = $this->params['imgWidth'];
$backHeight = $this->params['imgHeight'];
$xDst = floor(($backWidth-$newWidth)/2);
$yDst = floor(($backHeight-$newHeight)/2);
}
}
}
else if ($this->params['cropImage'] === 'yes')
{
if ($scale < 1)
{
$newWidth = $backWidth = $this->params['imgWidth'];
$newHeight = $backHeight = $this->params['imgHeight'];
$oldWidth = $width;
$oldHeight = $height;
$width = floor($newWidth/$scale);
$height = floor($newHeight/$scale);
$xSrc = $this->getSourceCoordinates("x",$oldWidth,$width);
$ySrc = $this->getSourceCoordinates("y",$oldHeight,$height);
}
else
{
$oldWidth = $width;
$oldHeight = $height;
if ($width <= $this->params['imgWidth'] and $height <= $this->params['imgHeight'])
{
$newWidth = $backWidth = $width;
$newHeight = $backHeight = $height;
if ($this->params['backgroundColor'])
{
$backWidth = $this->params['imgWidth'];
$backHeight = $this->params['imgHeight'];
$xDst = floor(($backWidth-$newWidth)/2);
$yDst = floor(($backHeight-$newHeight)/2);
}
}
else if ($width <= $this->params['imgWidth'])
{
$newWidth = $backWidth = $width;
$newHeight = $backHeight = $height = $this->params['imgHeight'];
$ySrc = $this->getSourceCoordinates("y",$oldHeight,$height);
if ($this->params['backgroundColor'])
{
$backWidth = $this->params['imgWidth'];
$backHeight = $this->params['imgHeight'];
$xDst = floor(($backWidth-$newWidth)/2);
}
}
else if ($height <= $this->params['imgHeight'])
{
$newHeight = $backHeight = $height;
$newWidth = $backWidth = $width = $this->params['imgWidth'];
$xSrc = $this->getSourceCoordinates("x",$oldWidth,$width);
if ($this->params['backgroundColor'])
{
$backWidth = $this->params['imgWidth'];
$backHeight = $this->params['imgHeight'];
$yDst = floor(($backHeight-$newHeight)/2);
}
}
}
}
//temp image
$tmpImg = imagecreatetruecolor($backWidth, $backHeight);
//set background color if backgroundColor param is not null (hex value)
if ($this->params['backgroundColor'])
{
if (strcmp($this->params['backgroundColor'],"transparent") !== 0)
{
$rgbColor = hex2rgb($this->params['backgroundColor']);
$backgroundC = imagecolorallocate($tmpImg,$rgbColor[0],$rgbColor[1],$rgbColor[2]);
}
else
{
$backgroundC = imagecolortransparent($tmpImg);
}
imagefill($tmpImg, 0, 0, $backgroundC);
}
if(strcmp($type,'png') === 0 or strcmp($type,'gif') === 0){
if ($this->params['backgroundColor'])
{
imagealphablending($tmpImg, true);
}
else
{
imagealphablending($tmpImg, false);
}
imagesavealpha($tmpImg, true);
}
if ($this->params['resample'] === 'yes')
{
//copy and resample
imagecopyresampled($tmpImg, $img, $xDst, $yDst, $xSrc, $ySrc,$newWidth, $newHeight, $width, $height);
}
else
{
//copy and resize
imagecopyresized($tmpImg, $img, $xDst, $yDst, $xSrc, $ySrc,$newWidth, $newHeight, $width, $height);
}
imagedestroy($img);
$img = $tmpImg;
if (!function_exists($this->params['function']))
{
throw new Exception('Error in <b>'.__METHOD__.'</b>: function <b>'.$this->params['function']. '</b> does not exist');
}
$img = call_user_func($this->params['function'],$img);
}
if (!$img)
{
$imgWidth = isset($this->params['imgWidth']) ? $this->params['imgWidth'] : 100;
$imgHeight = isset($this->params['imgHeight']) ? $this->params['imgHeight'] : 100;
$img = imagecreate($imgWidth, $imgHeight);
imagecolorallocate($img,200,200,200);
}
//print the image
if (!isset($outputFile))
{
header("Content-type: $contentType");
}
if (strcmp($type,'png') === 0)
{
imagepng($img,$outputFile,9);
}
else if (strcmp($type,'gif') === 0)
{
imagegif($img,$outputFile);
}
else
{
imagejpeg($img,$outputFile,90);
}
}
}
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