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<?php defined('SYSPATH') or die('No direct script access.');
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abstract class Image_Driver {
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// Reference to the current image
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protected $image;
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// Reference to the temporary processing image
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protected $tmp_image;
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// Processing errors
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protected $errors = array();
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/**
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* Executes a set of actions, defined in pairs.
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*
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* @param array actions
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* @return boolean
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*/
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public function execute($actions)
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{
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foreach($actions as $func => $args)
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{
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if ( ! $this->$func($args))
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return FALSE;
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}
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return TRUE;
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}
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/**
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* Sanitize and normalize a geometry array based on the temporary image
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* width and height. Valid properties are: width, height, top, left.
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*
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* @param array geometry properties
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* @return void
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*/
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protected function sanitize_geometry( & $geometry)
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{
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list($width, $height) = $this->properties();
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// Turn off error reporting
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$reporting = error_reporting(0);
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// Width and height cannot exceed current image size
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$geometry['width'] = min($geometry['width'], $width);
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$geometry['height'] = min($geometry['height'], $height);
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switch($geometry['top'])
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{
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case 'center':
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$geometry['top'] = floor(($height / 2) - ($geometry['height'] / 2));
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break;
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case 'top':
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$geometry['top'] = 0;
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break;
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case 'bottom':
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$geometry['top'] = $height - $geometry['height'];
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break;
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}
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switch($geometry['left'])
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{
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case 'center':
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$geometry['left'] = floor(($width / 2) - ($geometry['width'] / 2));
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break;
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case 'left':
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$geometry['left'] = 0;
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break;
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case 'right':
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$geometry['left'] = $width - $geometry['height'];
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break;
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}
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// Restore error reporting
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error_reporting($reporting);
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}
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/**
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* Return the current width and height of the temporary image. This is mainly
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* needed for sanitizing the geometry.
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*
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* @return array width, height
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*/
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abstract protected function properties();
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/**
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* Process an image with a set of actions.
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*
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* @param string image filename
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* @param array actions to execute
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* @param string destination directory path
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* @param string destination filename
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* @return boolean
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*/
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abstract public function process($image, $actions, $dir, $file);
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/**
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* Flip an image. Valid directions are horizontal and vertical.
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*
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* @param integer direction to flip
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* @return boolean
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*/
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abstract function flip($direction);
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/**
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* Crop an image. Valid properties are: width, height, top, left.
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*
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* @param array new properties
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* @return boolean
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*/
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abstract function crop($properties);
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/**
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* Resize an image. Valid properties are: width, height, and master.
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*
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* @param array new properties
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* @return boolean
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*/
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abstract public function resize($properties);
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/**
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* Rotate an image. Valid amounts are -180 to 180.
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*
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* @param integer amount to rotate
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* @return boolean
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*/
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abstract public function rotate($amount);
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/**
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* Sharpen and image. Valid amounts are 1 to 100.
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*
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* @param integer amount to sharpen
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* @return boolean
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*/
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abstract public function sharpen($amount);
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} // End Image Driver
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