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    class-wp-image-editor-imagick.php 13.47 KiB
    <?php
    /**
     * WordPress Imagick Image Editor
     *
     * @package WordPress
     * @subpackage Image_Editor
     */
    
    /**
     * WordPress Image Editor Class for Image Manipulation through Imagick PHP Module
     *
     * @since 3.5.0
     * @package WordPress
     * @subpackage Image_Editor
     * @uses WP_Image_Editor Extends class
     */
    class WP_Image_Editor_Imagick extends WP_Image_Editor {
    	/**
    	 * @var Imagick
    	 */
    	protected $image; // Imagick Object
    
    	public function __destruct() {
    		if ( $this->image instanceof Imagick ) {
    			// we don't need the original in memory anymore
    			$this->image->clear();
    			$this->image->destroy();
    		}
    	}
    
    	/**
    	 * Checks to see if current environment supports Imagick.
    	 *
    	 * We require Imagick 2.2.0 or greater, based on whether the queryFormats()
    	 * method can be called statically.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @return boolean
    	 */
    	public static function test( $args = array() ) {
    
    		// First, test Imagick's extension and classes.
    		if ( ! extension_loaded( 'imagick' ) || ! class_exists( 'Imagick' ) || ! class_exists( 'ImagickPixel' ) )
    			return false;
    
    		if ( version_compare( phpversion( 'imagick' ), '2.2.0', '<' ) )
    			return false;
    
    		$required_methods = array(
    			'clear',
    			'destroy',
    			'valid',
    			'getimage',
    			'writeimage',
    			'getimageblob',
    			'getimagegeometry',
    			'getimageformat',
    			'setimageformat',
    			'setimagecompression',
    			'setimagecompressionquality',
    			'setimagepage',
    			'scaleimage',
    			'cropimage',
    			'rotateimage',
    			'flipimage',
    			'flopimage',
    		);
    
    		// Now, test for deep requirements within Imagick.
    		if ( ! defined( 'imagick::COMPRESSION_JPEG' ) )
    			return false;
    
    		if ( array_diff( $required_methods, get_class_methods( 'Imagick' ) ) )
    			return false;
    
    		return true;
    	}
    
    	/**
    	 * Checks to see if editor supports the mime-type specified.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param string $mime_type
    	 * @return boolean
    	 */
    	public static function supports_mime_type( $mime_type ) {
    		$imagick_extension = strtoupper( self::get_extension( $mime_type ) );
    
    		if ( ! $imagick_extension )
    			return false;
    
    		// setIteratorIndex is optional unless mime is an animated format.
    		// Here, we just say no if you are missing it and aren't loading a jpeg.
    		if ( ! method_exists( 'Imagick', 'setIteratorIndex' ) && $mime_type != 'image/jpeg' )
    				return false;
    
    		try {
    			return ( (bool) @Imagick::queryFormats( $imagick_extension ) );
    		}
    		catch ( Exception $e ) {
    			return false;
    		}
    	}
    
    	/**
    	 * Loads image from $this->file into new Imagick Object.
    	 *
    	 * @since 3.5.0
    	 * @access protected
    	 *
    	 * @return boolean|WP_Error True if loaded; WP_Error on failure.
    	 */
    	public function load() {
    		if ( $this->image instanceof Imagick )
    			return true;
    
    		if ( ! is_file( $this->file ) && ! preg_match( '|^https?://|', $this->file ) )
    			return new WP_Error( 'error_loading_image', __('File doesn&#8217;t exist?'), $this->file );
    
    		/** This filter is documented in wp-includes/class-wp-image-editor-imagick.php */
    		// Even though Imagick uses less PHP memory than GD, set higher limit for users that have low PHP.ini limits
    		@ini_set( 'memory_limit', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) );
    
    		try {
    			$this->image = new Imagick( $this->file );
    
    			if( ! $this->image->valid() )
    				return new WP_Error( 'invalid_image', __('File is not an image.'), $this->file);
    
    			// Select the first frame to handle animated images properly
    			if ( is_callable( array( $this->image, 'setIteratorIndex' ) ) )
    				$this->image->setIteratorIndex(0);
    
    			$this->mime_type = $this->get_mime_type( $this->image->getImageFormat() );
    		}
    		catch ( Exception $e ) {
    			return new WP_Error( 'invalid_image', $e->getMessage(), $this->file );
    		}
    
    		$updated_size = $this->update_size();
    		if ( is_wp_error( $updated_size ) ) {
    			return $updated_size;
    		}
    
    		return $this->set_quality();
    	}
    
    	/**
    	 * Sets Image Compression quality on a 1-100% scale.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param int $quality Compression Quality. Range: [1,100]
    	 * @return boolean|WP_Error True if set successfully; WP_Error on failure.
    	 */
    	public function set_quality( $quality = null ) {
    		$quality_result = parent::set_quality( $quality );
    		if ( is_wp_error( $quality_result ) ) {
    			return $quality_result;
    		} else {
    			$quality = $this->get_quality();
    		}
    
    		try {
    			if ( 'image/jpeg' == $this->mime_type ) {
    				$this->image->setImageCompressionQuality( $quality );
    				$this->image->setImageCompression( imagick::COMPRESSION_JPEG );
    			}
    			else {
    				$this->image->setImageCompressionQuality( $quality );
    			}
    		}
    		catch ( Exception $e ) {
    			return new WP_Error( 'image_quality_error', $e->getMessage() );
    		}
    
    		return true;
    	}
    
    	/**
    	 * Sets or updates current image size.
    	 *
    	 * @since 3.5.0
    	 * @access protected
    	 *
    	 * @param int $width
    	 * @param int $height
    	 *
    	 * @return true|WP_Error
    	 */
    	protected function update_size( $width = null, $height = null ) {
    		$size = null;
    		if ( !$width || !$height ) {
    			try {
    				$size = $this->image->getImageGeometry();
    			}
    			catch ( Exception $e ) {
    				return new WP_Error( 'invalid_image', __('Could not read image size'), $this->file );
    			}
    		}
    
    		if ( ! $width )
    			$width = $size['width'];
    
    		if ( ! $height )
    			$height = $size['height'];
    
    		return parent::update_size( $width, $height );
    	}
    
    	/**
    	 * Resizes current image.
    	 *
    	 * At minimum, either a height or width must be provided.
    	 * If one of the two is set to null, the resize will
    	 * maintain aspect ratio according to the provided dimension.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param  int|null $max_w Image width.
    	 * @param  int|null $max_h Image height.
    	 * @param  boolean  $crop
    	 * @return boolean|WP_Error
    	 */
    	public function resize( $max_w, $max_h, $crop = false ) {
    		if ( ( $this->size['width'] == $max_w ) && ( $this->size['height'] == $max_h ) )
    			return true;
    
    		$dims = image_resize_dimensions( $this->size['width'], $this->size['height'], $max_w, $max_h, $crop );
    		if ( ! $dims )
    			return new WP_Error( 'error_getting_dimensions', __('Could not calculate resized image dimensions') );
    		list( $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ) = $dims;
    
    		if ( $crop ) {
    			return $this->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h );
    		}
    
    		try {
    			/**
    			 * @TODO: Thumbnail is more efficient, given a newer version of Imagemagick.
    			 * $this->image->thumbnailImage( $dst_w, $dst_h );
    			 */
    			$this->image->scaleImage( $dst_w, $dst_h );
    		}
    		catch ( Exception $e ) {
    			return new WP_Error( 'image_resize_error', $e->getMessage() );
    		}
    
    		return $this->update_size( $dst_w, $dst_h );
    	}
    
    	/**
    	 * Resize multiple images from a single source.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param array $sizes {
    	 *     An array of image size arrays. Default sizes are 'small', 'medium', 'large'.
    	 *
    	 *     Either a height or width must be provided.
    	 *     If one of the two is set to null, the resize will
    	 *     maintain aspect ratio according to the provided dimension.
    	 *
    	 *     @type array $size {
    	 *         @type int  ['width']  Optional. Image width.
    	 *         @type int  ['height'] Optional. Image height.
    	 *         @type bool $crop   Optional. Whether to crop the image. Default false.
    	 *     }
    	 * }
    	 * @return array An array of resized images' metadata by size.
    	 */
    	public function multi_resize( $sizes ) {
    		$metadata = array();
    		$orig_size = $this->size;
    		$orig_image = $this->image->getImage();
    
    		foreach ( $sizes as $size => $size_data ) {
    			if ( ! $this->image )
    				$this->image = $orig_image->getImage();
    
    			if ( ! isset( $size_data['width'] ) && ! isset( $size_data['height'] ) ) {
    				continue;
    			}
    
    			if ( ! isset( $size_data['width'] ) ) {
    				$size_data['width'] = null;
    			}
    			if ( ! isset( $size_data['height'] ) ) {
    				$size_data['height'] = null;
    			}
    
    			if ( ! isset( $size_data['crop'] ) ) {
    				$size_data['crop'] = false;
    			}
    
    			$resize_result = $this->resize( $size_data['width'], $size_data['height'], $size_data['crop'] );
    			$duplicate = ( ( $orig_size['width'] == $size_data['width'] ) && ( $orig_size['height'] == $size_data['height'] ) );
    
    			if ( ! is_wp_error( $resize_result ) && ! $duplicate ) {
    				$resized = $this->_save( $this->image );
    
    				$this->image->clear();
    				$this->image->destroy();
    				$this->image = null;
    
    				if ( ! is_wp_error( $resized ) && $resized ) {
    					unset( $resized['path'] );
    					$metadata[$size] = $resized;
    				}
    			}
    
    			$this->size = $orig_size;
    		}
    
    		$this->image = $orig_image;
    
    		return $metadata;
    	}
    
    	/**
    	 * Crops Image.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param int $src_x The start x position to crop from.
    	 * @param int $src_y The start y position to crop from.
    	 * @param int $src_w The width to crop.
    	 * @param int $src_h The height to crop.
    	 * @param int $dst_w Optional. The destination width.
    	 * @param int $dst_h Optional. The destination height.
    	 * @param boolean $src_abs Optional. If the source crop points are absolute.
    	 * @return boolean|WP_Error
    	 */
    	public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false ) {
    		if ( $src_abs ) {
    			$src_w -= $src_x;
    			$src_h -= $src_y;
    		}
    
    		try {
    			$this->image->cropImage( $src_w, $src_h, $src_x, $src_y );
    			$this->image->setImagePage( $src_w, $src_h, 0, 0);
    
    			if ( $dst_w || $dst_h ) {
    				// If destination width/height isn't specified, use same as
    				// width/height from source.
    				if ( ! $dst_w )
    					$dst_w = $src_w;
    				if ( ! $dst_h )
    					$dst_h = $src_h;
    
    				$this->image->scaleImage( $dst_w, $dst_h );
    				return $this->update_size();
    			}
    		}
    		catch ( Exception $e ) {
    			return new WP_Error( 'image_crop_error', $e->getMessage() );
    		}
    		return $this->update_size();
    	}
    
    	/**
    	 * Rotates current image counter-clockwise by $angle.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param float $angle
    	 * @return boolean|WP_Error
    	 */
    	public function rotate( $angle ) {
    		/**
    		 * $angle is 360-$angle because Imagick rotates clockwise
    		 * (GD rotates counter-clockwise)
    		 */
    		try {
    			$this->image->rotateImage( new ImagickPixel('none'), 360-$angle );
    
    			// Since this changes the dimensions of the image, update the size.
    			$result = $this->update_size();
    			if ( is_wp_error( $result ) )
    				return $result;
    
    			$this->image->setImagePage( $this->size['width'], $this->size['height'], 0, 0 );
    		}
    		catch ( Exception $e ) {
    			return new WP_Error( 'image_rotate_error', $e->getMessage() );
    		}
    		return true;
    	}
    
    	/**
    	 * Flips current image.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param boolean $horz Flip along Horizontal Axis
    	 * @param boolean $vert Flip along Vertical Axis
    	 * @returns boolean|WP_Error
    	 */
    	public function flip( $horz, $vert ) {
    		try {
    			if ( $horz )
    				$this->image->flipImage();
    
    			if ( $vert )
    				$this->image->flopImage();
    		}
    		catch ( Exception $e ) {
    			return new WP_Error( 'image_flip_error', $e->getMessage() );
    		}
    		return true;
    	}
    
    	/**
    	 * Saves current image to file.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param string $destfilename
    	 * @param string $mime_type
    	 * @return array|WP_Error {'path'=>string, 'file'=>string, 'width'=>int, 'height'=>int, 'mime-type'=>string}
    	 */
    	public function save( $destfilename = null, $mime_type = null ) {
    		$saved = $this->_save( $this->image, $destfilename, $mime_type );
    
    		if ( ! is_wp_error( $saved ) ) {
    			$this->file = $saved['path'];
    			$this->mime_type = $saved['mime-type'];
    
    			try {
    				$this->image->setImageFormat( strtoupper( $this->get_extension( $this->mime_type ) ) );
    			}
    			catch ( Exception $e ) {
    				return new WP_Error( 'image_save_error', $e->getMessage(), $this->file );
    			}
    		}
    
    		return $saved;
    	}
    
    	protected function _save( $image, $filename = null, $mime_type = null ) {
    		list( $filename, $extension, $mime_type ) = $this->get_output_format( $filename, $mime_type );
    
    		if ( ! $filename )
    			$filename = $this->generate_filename( null, null, $extension );
    
    		try {
    			// Store initial Format
    			$orig_format = $this->image->getImageFormat();
    
    			$this->image->setImageFormat( strtoupper( $this->get_extension( $mime_type ) ) );
    			$this->make_image( $filename, array( $image, 'writeImage' ), array( $filename ) );
    
    			// Reset original Format
    			$this->image->setImageFormat( $orig_format );
    		}
    		catch ( Exception $e ) {
    			return new WP_Error( 'image_save_error', $e->getMessage(), $filename );
    		}
    
    		// Set correct file permissions
    		$stat = stat( dirname( $filename ) );
    		$perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
    		@ chmod( $filename, $perms );
    
    		/** This filter is documented in wp-includes/class-wp-image-editor-gd.php */
    		return array(
    			'path'      => $filename,
    			'file'      => wp_basename( apply_filters( 'image_make_intermediate_size', $filename ) ),
    			'width'     => $this->size['width'],
    			'height'    => $this->size['height'],
    			'mime-type' => $mime_type,
    		);
    	}
    
    	/**
    	 * Streams current image to browser.
    	 *
    	 * @since 3.5.0
    	 * @access public
    	 *
    	 * @param string $mime_type
    	 * @return boolean|WP_Error
    	 */
    	public function stream( $mime_type = null ) {
    		list( $filename, $extension, $mime_type ) = $this->get_output_format( null, $mime_type );
    
    		try {
    			// Temporarily change format for stream
    			$this->image->setImageFormat( strtoupper( $extension ) );
    
    			// Output stream of image content
    			header( "Content-Type: $mime_type" );
    			print $this->image->getImageBlob();
    
    			// Reset Image to original Format
    			$this->image->setImageFormat( $this->get_extension( $this->mime_type ) );
    		}
    		catch ( Exception $e ) {
    			return new WP_Error( 'image_stream_error', $e->getMessage() );
    		}
    
    		return true;
    	}
    }