Файл: protected/extensions/image/Image.php
Строк: 368
<?php
Yii::import('application.extensions.image.Image_Driver');
/**
* 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 3809 2008-12-18 12:48:41Z OscarB $
*
* @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 $image = '';
/**
* Creates a new Image instance and returns it.
*
* @param string filename of image
* @param array non-default configurations
* @return object
*/
public static function factory($image, $config = NULL)
{
return new Image($image, $config);
}
/**
* Creates a new image editor instance.
*
* @throws Kohana_Exception
* @param string filename of image
* @param array non-default configurations
* @return void
*/
public function __construct($image, $config = NULL)
{
static $check;
// Make the check exactly once
($check === NULL) and $check = function_exists('getimagesize');
if ($check === FALSE)
throw new CException('image getimagesize missing');
// Check to make sure the image exists
if ( ! is_file($image))
throw new CException('image file not found');
// 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($image_info) < 3)
throw new CException('image file unreadable');
// Check to make sure the image type is allowed
if ( ! isset(Image::$allowed_types[$image_info[2]]))
throw new CException('image type not allowed');
// 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' => $image_info['mime']
);
// Load configuration
if ($config === null){
$this->config = array(
'driver'=>'GD',
'params'=>array(),
);
}
else{
$this->config = $config;
}
// Set driver class name
$driver = 'Image_'.ucfirst($this->config['driver']).'_Driver';
// Load the driver
Yii::import("application.extensions.image.drivers.$driver");
// Initialize the driver
$this->driver = new $driver($this->config['params']);
// Validate the driver
if ( ! ($this->driver instanceof Image_Driver))
throw new CException('image driver must be implement Image_Driver class');
}
/**
* Handles retrieval of pre-save image properties
*
* @param string property name
* @return mixed
*/
public function __get($property)
{
if (isset($this->image[$property]))
{
return $this->image[$property];
}
else
{
throw new CException('invalid property');
}
}
/**
* 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 CException('image invalid width');
if ( ! $this->valid_size('height', $height))
throw new CException('image invalid height');
if (empty($width) AND empty($height))
throw new CException('image invalid dimensions');
if ($master === NULL)
{
// Maintain the aspect ratio by default
$master = Image::AUTO;
}
elseif ( ! $this->valid_size('master', $master))
throw new CException('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 CException('image invalid width', $width);
if ( ! $this->valid_size('height', $height))
throw new CException('image invalid height', $height);
if ( ! $this->valid_size('top', $top))
throw new CException('image invalid top', $top);
if ( ! $this->valid_size('left', $left))
throw new CException('image invalid left', $left);
if (empty($width) AND empty($height))
throw new CException('image invalid dimensions');
$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 CException('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 $this;
}
/**
* Save the image to a new image or overwrite this image.
*
* @throws Kohana_Exception
* @param string new image filename
* @param integer permissions for new image
* @param boolean keep or discard image process actions
* @return object
*/
public function save($new_image = FALSE, $chmod = 0644, $keep_actions = FALSE)
{
// If no new image is defined, use the current image
empty($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($dir))
throw new CException('image directory unwritable');
if ($status = $this->driver->process($this->image, $this->actions, $dir, $file))
{
if ($chmod !== FALSE)
{
// Set permissions
chmod($new_image, $chmod);
}
}
// Reset actions. Subsequent save() or render() will not apply previous actions.
if ($keep_actions === FALSE)
$this->actions = array();
return $status;
}
/**
* Output the image to the browser.
*
* @param boolean keep or discard image process actions
* @return object
*/
public function render($keep_actions = FALSE)
{
$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)).'/';
// Process the image with the driver
$status = $this->driver->process($this->image, $this->actions, $dir, $file, $render = TRUE);
// Reset actions. Subsequent save() or render() will not apply previous actions.
if ($keep_actions === FALSE)
$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