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