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/**
 * Loads the image and checks if its compatable.
 * 
 * @param string $filename The file to load
 * @return Image_Driver
 */
public static function load($filename)

/**
 * Crops the image using coordinates or percentages.
 * 
 * Absolute integer or percentages accepted for all 4.
 *  
 * @param integer $x1 X-Coordinate based from the top-left corner.
 * @param integer $y1 Y-Coordinate based from the top-left corner.
 * @param integer $x2 X-Coordinate based from the bottom-right corner.
 * @param integer $y2 Y-Coordinate based from the bottom-right corner.
 * @return Image_Driver
 */
public static function crop($x1, $y1, $x2, $y2)

/**
 * Resizes the image. If the width or height is null, it will resize retaining the original aspect ratio.
 * 
 * @param integer $width The new width of the image.
 * @param integer $height The new height of the image.
 * @param boolean $keepar Defaults to true. If false, allows resizing without keeping AR.
 * @return Image_Driver
 */
public static function resize($width, $height, $keepar = true)

/**
 * Rotates the image
 * 
 * @param integer $degrees The degrees to rotate, negatives integers allowed.
 * @return Image_Driver
 */
public static function rotate($degrees)

/**
 * Adds a watermark to the image.
 * 
 * @param string $filename The filename of the watermark file to use.
 * @param string $position The position of the watermark, ex: "bottom right", "center center", "top left"
 * @param
 * @return Image_Driver
 */
public static function watermark($filename, $position, $padding = 5)

/**
 * Adds a border to the image.
 *
 * @param integer $size The side of the border, in pixels.
 * @param string $color A hexidecimal color.
 * @param Image_Driver
 */
public static function border($size, $color = null) {

/**
 * Masks the image using the alpha channel of the image input.
 *
 * @param string $maskimage The location of the image to use as the mask
 * @return Image_Driver
 */
public static function mask($maskimage) {

/**
 * Adds rounded corners to the image.
 *
 * @param integer $radius
 * @param integer $sides Accepts any combination of "tl tr bl br" seperated by spaces, or null for all sides
 * @param integer $antialias Sets the antialias range.
 * @return Image_Driver
 */
public static function rounded($radius, $sides = null, $antialias = null)

/**
 * Saves the image, and optionally attempts to set permissions
 * 
 * @param string $filename The location where to save the image.
 * @param string $permissions Allows unix style permissions
 */
public static function save($filename, $permissions = null)

/**
 * Outputs the file directly to the user.
 * 
 * @param string $filetype The extension type to use. Ex: png, jpg, bmp, gif
 */
public static function output($filetype)