Make Tonesque work with allow_url_fopen disabled

[mightymt]

Currently Tonesque doesn't work with remote images when running in environments where allow_url_fopen is disabled because it uses the imagecreatefromgif, imagecreatefrompng and imagecreatefromjpeg functions.

I would suggest that in the color function you replace this...

switch ( $file ) {
    case 'gif' :
        $img = imagecreatefromgif( $image );
        break;
    case 'png' :
        $img = imagecreatefrompng( $image );
        break;
    case 'jpg' :
    case 'jpeg' :
        $img = imagecreatefromjpeg( $image );
        break;
    default:
        return false;
}

...with something like this...

if ( !in_array( $file, array( 'gif', 'jpg', 'jpeg', 'png' ) ) ) {
    return false;
}   

$response = wp_remote_request( $image, array( 'method' => 'GET' ) );

if ( is_wp_error( $response ) || empty( $response[ 'body' ] ) || $response['response']['code'] != 200 ) {
    return false;
}

$img = imagecreatefromstring( wp_remote_retrieve_body( $response ) );

I tested the above code on my shared hosted site where allow_url_fopen is disabled and it works as expected.