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freenetis-github/system/libraries/Image.php @ master

<?php defined('SYSPATH') or die('No direct script access.');
/**
* Manipulate images using standard methods such as resize, crop, rotate, etc.
* This class must be re-initialized for every image you wish to manipulate.
*
* $Id: Image.php 1911 2008-02-04 16:13:16Z PugFish $
*
* @package Image
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Image {

// Master Dimension
const NONE = 1;
const AUTO = 2;
const HEIGHT = 3;
const WIDTH = 4;
// Flip Directions
const HORIZONTAL = 5;
const VERTICAL = 6;

// Allowed image types
public static $allowed_types = array
(
IMAGETYPE_GIF => 'gif',
IMAGETYPE_JPEG => 'jpg',
IMAGETYPE_PNG => 'png',
IMAGETYPE_TIFF_II => 'tiff',
IMAGETYPE_TIFF_MM => 'tiff',
);

// Driver instance
protected $driver;

// Driver actions
protected $actions = array();

// Reference to the current image filename
protected $image = '';

/**
* Creates a new image editor instance.
*
* @throws Kohana_Exception
* @param string filename of image
* @param array non-default configurations
* @return void
*/
public function __construct($image, $config = NULL)
{
static $check;

// Make the check exactly once
($check === NULL) and $check = function_exists('getimagesize');

if ($check === FALSE)
throw new Kohana_Exception('image.getimagesize_missing');

// Check to make sure the image exists
if ( ! file_exists($image))
throw new Kohana_Exception('image.file_not_found', $image);

// Disable error reporting, to prevent PHP warnings
$ER = error_reporting(0);

// Fetch the image size and mime type
$image_info = getimagesize($image);

// Turn on error reporting again
error_reporting($ER);

// Make sure that the image is readable and valid
if ( ! is_array($image_info) OR count($image_info) < 3)
throw new Kohana_Exception('image.file_unreadable', $image);

// Check to make sure the image type is allowed
if ( ! isset(Image::$allowed_types[$image_info[2]]))
throw new Kohana_Exception('image.type_not_allowed', $image);

// Image has been validated, load it
$this->image = array
(
'file' => str_replace('\\', '/', realpath($image)),
'width' => $image_info[0],
'height' => $image_info[1],
'type' => $image_info[2],
'ext' => Image::$allowed_types[$image_info[2]],
'mime' => $image_info['mime']
);

// Load configuration
$this->config = (array) $config + Config::item('image');

// Set driver class name
$driver = 'Image_'.ucfirst($this->config['driver']).'_Driver';

// Load the driver
if ( ! Kohana::auto_load($driver))
throw new Kohana_Exception('image.driver_not_supported', $this->config['driver']);

// Initialize the driver
$this->driver = new $driver($this->config['params']);

if ( ! ($this->driver instanceof Image_Driver))
throw new Kohana_Exception('image.invalid_driver', $driver);
}

/**
* Resize an image to a specific width and height. By default, Kohana will
* maintain the aspect ratio using the width as the master dimension. If you
* wish to use height as master dim, set $image->master_dim = Image::HEIGHT
* This method is chainable.
*
* @throws Kohana_Exception
* @param integer width
* @param integer height
* @param integer one of: Image::NONE, Image::AUTO, Image::WIDTH, Image::HEIGHT
* @return object
*/
public function resize($width, $height, $master = NULL)
{
if ( ! $this->valid_size('width', $width))
throw new Kohana_Exception('image.invalid_width', $width);

if ( ! $this->valid_size('height', $height))
throw new Kohana_Exception('image.invalid_height', $height);

if (empty($width) AND empty($height))
throw new Kohana_Exception('image.invalid_dimensions', __FUNCTION__);

if ($master === NULL)
{
// Maintain the aspect ratio by default
$master = Image::AUTO;
}
elseif ( ! $this->valid_size('master', $master))
throw new Kohana_Exception('image.invalid_master');

$this->actions['resize'] = array
(
'width' => $width,
'height' => $height,
'master' => $master,
);

return $this;
}

/**
* Crop an image to a specific width and height. You may also set the top
* and left offset.
* This method is chainable.
*
* @throws Kohana_Exception
* @param integer width
* @param integer height
* @param integer top offset, pixel value or one of: top, center, bottom
* @param integer left offset, pixel value or one of: left, center, right
* @return object
*/
public function crop($width, $height, $top = 'center', $left = 'center')
{
if ( ! $this->valid_size('width', $width))
throw new Kohana_Exception('image.invalid_width', $width);

if ( ! $this->valid_size('height', $height))
throw new Kohana_Exception('image.invalid_height', $height);

if ( ! $this->valid_size('top', $top))
throw new Kohana_Exception('image.invalid_top', $top);

if ( ! $this->valid_size('left', $left))
throw new Kohana_Exception('image.invalid_left', $left);

if (empty($width) AND empty($height))
throw new Kohana_Exception('image.invalid_dimensions', __FUNCTION__);

$this->actions['crop'] = array
(
'width' => $width,
'height' => $height,
'top' => $top,
'left' => $left,
);

return $this;
}

/**
* Allows rotation of an image by 180 degrees clockwise or counter clockwise.
*
* @param integer degrees
* @return object
*/
public function rotate($degrees)
{
$degrees = (int) $degrees;

if ($degrees > 180)
{
do
{
// Keep subtracting full circles until the degrees have normalized
$degrees -= 360;
}
while($degrees > 180);
}

if ($degrees < -180)
{
do
{
// Keep adding full circles until the degrees have normalized
$degrees += 360;
}
while($degrees < -180);
}

$this->actions['rotate'] = $degrees;

return $this;
}

/**
* Flip an image horizontally or vertically.
*
* @throws Kohana_Exception
* @param integer direction
* @return object
*/
public function flip($direction)
{
if ($direction !== self::HORIZONTAL AND $direction !== self::VERTICAL)
throw new Kohana_Exception('image.invalid_flip');

$this->actions['flip'] = $direction;

return $this;
}

/**
* Change the quality of an image.
*
* @param integer quality as a percentage
* @return object
*/
public function quality($amount)
{
$this->actions['quality'] = max(1, min($amount, 100));

return $this;
}

/**
* Sharpen an image.
*
* @param integer amount to sharpen, usually ~20 is ideal
* @return object
*/
public function sharpen($amount)
{
$this->actions['sharpen'] = max(1, min($amount, 100));

return $this;
}

/**
* Save the image to a new image or overwrite this image.
*
* @throws Kohana_Exception
* @param string new image filename
* @return object
*/
public function save($new_image = FALSE)
{
// If no new image is defined, use the current image
empty($new_image) and $new_image = $this->image['file'];

// Separate the directory and filename
$dir = pathinfo($new_image, PATHINFO_DIRNAME);
$file = pathinfo($new_image, PATHINFO_BASENAME);

// Normalize the path
$dir = str_replace('\\', '/', realpath($dir)).'/';

if ( ! is_writable($dir))
throw new Kohana_Exception('image.directory_unwritable', $dir);

// Process the image with the driver
$status = $this->driver->process($this->image, $this->actions, $dir, $file);

// Reset the actions
$this->actions = array();

return $status;
}

/**
* Sanitize a given value type.
*
* @param string type of property
* @param mixed property value
* @return boolean
*/
protected function valid_size($type, & $value)
{
if (is_null($value))
return TRUE;

if ( ! is_scalar($value))
return FALSE;

switch($type)
{
case 'width':
case 'height':
if (is_string($value) AND ! ctype_digit($value))
{
// Only numbers and percent signs
if ( ! preg_match('/^[0-9]++%$/D', $value))
return FALSE;
}
else
{
$value = (int) $value;
}
break;
case 'top':
if (is_string($value) AND ! ctype_digit($value))
{
if ( ! in_array($value, array('top', 'bottom', 'center')))
return FALSE;
}
else
{
$value = (int) $value;
}
break;
case 'left':
if (is_string($value) AND ! ctype_digit($value))
{
if ( ! in_array($value, array('left', 'right', 'center')))
return FALSE;
}
else
{
$value = (int) $value;
}
break;
case 'master':
if ($value !== Image::NONE AND
$value !== Image::AUTO AND
$value !== Image::WIDTH AND
$value !== Image::HEIGHT)
return FALSE;
break;
}

return TRUE;
}

} // End Image
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