freenetis-github/system/libraries/drivers/Image.php @ 9d87019d
| 8baed187 | Michal Kliment | <?php defined('SYSPATH') or die('No direct script access.');
|
|
abstract class Image_Driver {
|
|||
// Reference to the current image
|
|||
protected $image;
|
|||
// Reference to the temporary processing image
|
|||
protected $tmp_image;
|
|||
// Processing errors
|
|||
protected $errors = array();
|
|||
/**
|
|||
* Executes a set of actions, defined in pairs.
|
|||
*
|
|||
* @param array actions
|
|||
* @return boolean
|
|||
*/
|
|||
public function execute($actions)
|
|||
{
|
|||
foreach($actions as $func => $args)
|
|||
{
|
|||
if ( ! $this->$func($args))
|
|||
return FALSE;
|
|||
}
|
|||
return TRUE;
|
|||
}
|
|||
/**
|
|||
* Sanitize and normalize a geometry array based on the temporary image
|
|||
* width and height. Valid properties are: width, height, top, left.
|
|||
*
|
|||
* @param array geometry properties
|
|||
* @return void
|
|||
*/
|
|||
protected function sanitize_geometry( & $geometry)
|
|||
{
|
|||
list($width, $height) = $this->properties();
|
|||
// Turn off error reporting
|
|||
$reporting = error_reporting(0);
|
|||
// Width and height cannot exceed current image size
|
|||
$geometry['width'] = min($geometry['width'], $width);
|
|||
$geometry['height'] = min($geometry['height'], $height);
|
|||
switch($geometry['top'])
|
|||
{
|
|||
case 'center':
|
|||
$geometry['top'] = floor(($height / 2) - ($geometry['height'] / 2));
|
|||
break;
|
|||
case 'top':
|
|||
$geometry['top'] = 0;
|
|||
break;
|
|||
case 'bottom':
|
|||
$geometry['top'] = $height - $geometry['height'];
|
|||
break;
|
|||
}
|
|||
switch($geometry['left'])
|
|||
{
|
|||
case 'center':
|
|||
$geometry['left'] = floor(($width / 2) - ($geometry['width'] / 2));
|
|||
break;
|
|||
case 'left':
|
|||
$geometry['left'] = 0;
|
|||
break;
|
|||
case 'right':
|
|||
$geometry['left'] = $width - $geometry['height'];
|
|||
break;
|
|||
}
|
|||
// Restore error reporting
|
|||
error_reporting($reporting);
|
|||
}
|
|||
/**
|
|||
* Return the current width and height of the temporary image. This is mainly
|
|||
* needed for sanitizing the geometry.
|
|||
*
|
|||
* @return array width, height
|
|||
*/
|
|||
abstract protected function properties();
|
|||
/**
|
|||
* Process an image with a set of actions.
|
|||
*
|
|||
* @param string image filename
|
|||
* @param array actions to execute
|
|||
* @param string destination directory path
|
|||
* @param string destination filename
|
|||
* @return boolean
|
|||
*/
|
|||
abstract public function process($image, $actions, $dir, $file);
|
|||
/**
|
|||
* Flip an image. Valid directions are horizontal and vertical.
|
|||
*
|
|||
* @param integer direction to flip
|
|||
* @return boolean
|
|||
*/
|
|||
abstract function flip($direction);
|
|||
/**
|
|||
* Crop an image. Valid properties are: width, height, top, left.
|
|||
*
|
|||
* @param array new properties
|
|||
* @return boolean
|
|||
*/
|
|||
abstract function crop($properties);
|
|||
/**
|
|||
* Resize an image. Valid properties are: width, height, and master.
|
|||
*
|
|||
* @param array new properties
|
|||
* @return boolean
|
|||
*/
|
|||
abstract public function resize($properties);
|
|||
/**
|
|||
* Rotate an image. Valid amounts are -180 to 180.
|
|||
*
|
|||
* @param integer amount to rotate
|
|||
* @return boolean
|
|||
*/
|
|||
abstract public function rotate($amount);
|
|||
/**
|
|||
* Sharpen and image. Valid amounts are 1 to 100.
|
|||
*
|
|||
* @param integer amount to sharpen
|
|||
* @return boolean
|
|||
*/
|
|||
abstract public function sharpen($amount);
|
|||
} // End Image Driver
|