add apply Image Convolution

[GoodLittleDev]

I wrote this to add Image Convolution matrix options to an image though I would share.
add this to \PHPImageWorkshop\Core\ImageWorkshopLayer.php

I put it just after apply Filter function.

public function applyImageConvolution($matrix, $div=0, $offset=0,$recursive=false){
if(is_string($matrix)){
$matrix = strtolower($matrix);
switch($matrix){
case "blur":
$matrix = array(array(1,1,1), array(1,.25,1), array(1,1,1));
$div = 8.25;
$offset = 0;
break;

            case "emboss": 
                $matrix = array(array(2, 2, 2), array(2, 1, -2), array(-2, -2, -2));
                $div = 0;
                $offset = 127;
            break;

            case  "gaussian blur" :
                $matrix = array(array(1.0, 2.0, 1.0), array(2.0, 4.0, 2.0), array(1.0, 2.0, 1.0));
                $div = 16;
                $offset = 0;
            break;

            case "sharpen" :
                $Matrix = array(array(-1.2, -1.2, -1.2),array(-1.2, .4, -1.2),array(-1.2, -1.2, -1.2)); 
                $div = array_sum(array_map('array_sum', $Matrix));  
                $offset = 0;
            break;

        }

    }
    if(is_array($matrix)){
        imageconvolution($this->image, $matrix, $div, $offset);
    }

    if ($recursive) {

        $layers = $this->layers;

        foreach($layers as $layerId => $layer) {
            $this->layers[$layerId]->applyImageConvolution($matrix, $div, $offset);
        }
    }



}