phpldapadmin/includes/kohana/modules/image/classes/Kohana/Image/Imagick.php
2013-03-19 15:55:33 +11:00

334 lines
8.4 KiB
PHP

<?php defined('SYSPATH') OR die('No direct script access.');
/**
* Support for image manipulation using [Imagick](http://php.net/Imagick).
*
* @package Kohana/Image
* @category Drivers
* @author Tamas Mihalik tamas.mihalik@gmail.com
* @copyright (c) 2009-2012 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Kohana_Image_Imagick extends Image {
/**
* @var Imagick image magick object
*/
protected $im;
/**
* Checks if ImageMagick is enabled.
*
* @throws Kohana_Exception
* @return boolean
*/
public static function check()
{
if ( ! extension_loaded('imagick'))
{
throw new Kohana_Exception('Imagick is not installed, or the extension is not loaded');
}
return Image_Imagick::$_checked = TRUE;
}
/**
* Runs [Image_Imagick::check] and loads the image.
*
* @return void
* @throws Kohana_Exception
*/
public function __construct($file)
{
if ( ! Image_Imagick::$_checked)
{
// Run the install check
Image_Imagick::check();
}
parent::__construct($file);
$this->im = new Imagick;
$this->im->readImage($file);
if ( ! $this->im->getImageAlphaChannel())
{
// Force the image to have an alpha channel
$this->im->setImageAlphaChannel(Imagick::ALPHACHANNEL_SET);
}
}
/**
* Destroys the loaded image to free up resources.
*
* @return void
*/
public function __destruct()
{
$this->im->clear();
$this->im->destroy();
}
protected function _do_resize($width, $height)
{
if ($this->im->scaleImage($width, $height))
{
// Reset the width and height
$this->width = $this->im->getImageWidth();
$this->height = $this->im->getImageHeight();
return TRUE;
}
return FALSE;
}
protected function _do_crop($width, $height, $offset_x, $offset_y)
{
if ($this->im->cropImage($width, $height, $offset_x, $offset_y))
{
// Reset the width and height
$this->width = $this->im->getImageWidth();
$this->height = $this->im->getImageHeight();
// Trim off hidden areas
$this->im->setImagePage($this->width, $this->height, 0, 0);
return TRUE;
}
return FALSE;
}
protected function _do_rotate($degrees)
{
if ($this->im->rotateImage(new ImagickPixel('transparent'), $degrees))
{
// Reset the width and height
$this->width = $this->im->getImageWidth();
$this->height = $this->im->getImageHeight();
// Trim off hidden areas
$this->im->setImagePage($this->width, $this->height, 0, 0);
return TRUE;
}
return FALSE;
}
protected function _do_flip($direction)
{
if ($direction === Image::HORIZONTAL)
{
return $this->im->flopImage();
}
else
{
return $this->im->flipImage();
}
}
protected function _do_sharpen($amount)
{
// IM not support $amount under 5 (0.15)
$amount = ($amount < 5) ? 5 : $amount;
// Amount should be in the range of 0.0 to 3.0
$amount = ($amount * 3.0) / 100;
return $this->im->sharpenImage(0, $amount);
}
protected function _do_reflection($height, $opacity, $fade_in)
{
// Clone the current image and flip it for reflection
$reflection = $this->im->clone();
$reflection->flipImage();
// Crop the reflection to the selected height
$reflection->cropImage($this->width, $height, 0, 0);
$reflection->setImagePage($this->width, $height, 0, 0);
// Select the fade direction
$direction = array('transparent', 'black');
if ($fade_in)
{
// Change the direction of the fade
$direction = array_reverse($direction);
}
// Create a gradient for fading
$fade = new Imagick;
$fade->newPseudoImage($reflection->getImageWidth(), $reflection->getImageHeight(), vsprintf('gradient:%s-%s', $direction));
// Apply the fade alpha channel to the reflection
$reflection->compositeImage($fade, Imagick::COMPOSITE_DSTOUT, 0, 0);
// NOTE: Using setImageOpacity will destroy alpha channels!
$reflection->evaluateImage(Imagick::EVALUATE_MULTIPLY, $opacity / 100, Imagick::CHANNEL_ALPHA);
// Create a new container to hold the image and reflection
$image = new Imagick;
$image->newImage($this->width, $this->height + $height, new ImagickPixel);
// Force the image to have an alpha channel
$image->setImageAlphaChannel(Imagick::ALPHACHANNEL_SET);
// Force the background color to be transparent
// $image->setImageBackgroundColor(new ImagickPixel('transparent'));
// Match the colorspace between the two images before compositing
$image->setColorspace($this->im->getColorspace());
// Place the image and reflection into the container
if ($image->compositeImage($this->im, Imagick::COMPOSITE_SRC, 0, 0)
AND $image->compositeImage($reflection, Imagick::COMPOSITE_OVER, 0, $this->height))
{
// Replace the current image with the reflected image
$this->im = $image;
// Reset the width and height
$this->width = $this->im->getImageWidth();
$this->height = $this->im->getImageHeight();
return TRUE;
}
return FALSE;
}
protected function _do_watermark(Image $image, $offset_x, $offset_y, $opacity)
{
// Convert the Image intance into an Imagick instance
$watermark = new Imagick;
$watermark->readImageBlob($image->render(), $image->file);
if ($watermark->getImageAlphaChannel() !== Imagick::ALPHACHANNEL_ACTIVATE)
{
// Force the image to have an alpha channel
$watermark->setImageAlphaChannel(Imagick::ALPHACHANNEL_OPAQUE);
}
if ($opacity < 100)
{
// NOTE: Using setImageOpacity will destroy current alpha channels!
$watermark->evaluateImage(Imagick::EVALUATE_MULTIPLY, $opacity / 100, Imagick::CHANNEL_ALPHA);
}
// Match the colorspace between the two images before compositing
// $watermark->setColorspace($this->im->getColorspace());
// Apply the watermark to the image
return $this->im->compositeImage($watermark, Imagick::COMPOSITE_DISSOLVE, $offset_x, $offset_y);
}
protected function _do_background($r, $g, $b, $opacity)
{
// Create a RGB color for the background
$color = sprintf('rgb(%d, %d, %d)', $r, $g, $b);
// Create a new image for the background
$background = new Imagick;
$background->newImage($this->width, $this->height, new ImagickPixel($color));
if ( ! $background->getImageAlphaChannel())
{
// Force the image to have an alpha channel
$background->setImageAlphaChannel(Imagick::ALPHACHANNEL_SET);
}
// Clear the background image
$background->setImageBackgroundColor(new ImagickPixel('transparent'));
// NOTE: Using setImageOpacity will destroy current alpha channels!
$background->evaluateImage(Imagick::EVALUATE_MULTIPLY, $opacity / 100, Imagick::CHANNEL_ALPHA);
// Match the colorspace between the two images before compositing
$background->setColorspace($this->im->getColorspace());
if ($background->compositeImage($this->im, Imagick::COMPOSITE_DISSOLVE, 0, 0))
{
// Replace the current image with the new image
$this->im = $background;
return TRUE;
}
return FALSE;
}
protected function _do_save($file, $quality)
{
// Get the image format and type
list($format, $type) = $this->_get_imagetype(pathinfo($file, PATHINFO_EXTENSION));
// Set the output image type
$this->im->setFormat($format);
// Set the output quality
$this->im->setImageCompressionQuality($quality);
if ($this->im->writeImage($file))
{
// Reset the image type and mime type
$this->type = $type;
$this->mime = image_type_to_mime_type($type);
return TRUE;
}
return FALSE;
}
protected function _do_render($type, $quality)
{
// Get the image format and type
list($format, $type) = $this->_get_imagetype($type);
// Set the output image type
$this->im->setFormat($format);
// Set the output quality
$this->im->setImageCompressionQuality($quality);
// Reset the image type and mime type
$this->type = $type;
$this->mime = image_type_to_mime_type($type);
return (string) $this->im;
}
/**
* Get the image type and format for an extension.
*
* @param string $extension image extension: png, jpg, etc
* @return string IMAGETYPE_* constant
* @throws Kohana_Exception
*/
protected function _get_imagetype($extension)
{
// Normalize the extension to a format
$format = strtolower($extension);
switch ($format)
{
case 'jpg':
case 'jpeg':
$type = IMAGETYPE_JPEG;
break;
case 'gif':
$type = IMAGETYPE_GIF;
break;
case 'png':
$type = IMAGETYPE_PNG;
break;
default:
throw new Kohana_Exception('Installed ImageMagick does not support :type images',
array(':type' => $extension));
break;
}
return array($format, $type);
}
} // End Kohana_Image_Imagick