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<?php |
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/** |
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* The Image Class. |
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* |
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* @package Jetpack |
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*/ |
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/** |
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* Represents a resizable image, exposing properties necessary for properly generating srcset. |
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*/ |
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class Jetpack_Photon_Image { |
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/** |
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* @var string $filename Attachment's Filename. |
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*/ |
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public $filename; |
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/** |
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* @var string/WP_Erorr $mime_type Attachment's mime-type, WP_Error on failure when recalculating the dimensions. |
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*/ |
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private $mime_type; |
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/** |
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* @var int $original_width Image original width. |
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*/ |
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private $original_width; |
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/** |
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* @var int $original_width Image original height. |
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*/ |
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private $original_height; |
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/** |
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* @var int $width Current attachment's width. |
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*/ |
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private $width; |
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/** |
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* @var int $height Current attachment's height. |
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*/ |
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private $height; |
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/** |
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* @var bool $is_resized Whether the attachment has been resized yet, or not. |
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*/ |
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private $is_resized = false; |
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/** |
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* Constructs the image object. |
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* |
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* The $data array should provide at least |
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* file : string Image file path |
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* width : int Image width |
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* height : int Image height |
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* |
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* @param array $data Array of attachment metadata, typically value of _wp_attachment_metadata postmeta |
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* @param string|\WP_Error $mime_type Typically value returned from get_post_mime_type function. |
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*/ |
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public function __construct( $data, $mime_type ) { |
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$this->filename = $data['file']; |
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$this->width = $this->original_width = $data['width']; |
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$this->height = $this->original_height = $data['height']; |
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$this->mime_type = $mime_type; |
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} |
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/** |
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* Resizes the image to given size. |
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* |
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* @param array $size_data Array of width, height, and crop properties of a size. |
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* |
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* @return bool|\WP_Error True if resize was successful, WP_Error on failure. |
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*/ |
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public function resize( $size_data ) { |
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$dimensions = $this->image_resize_dimensions( $size_data['width'], $size_data['height'], $size_data['crop'] ); |
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if ( true === is_wp_error( $dimensions ) ) { |
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return $dimensions; // Returns \WP_Error. |
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} |
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if ( true === is_wp_error( $this->mime_type ) ) { |
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return $this->mime_type; // Returns \WP_Error. |
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} |
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$this->set_width_height( $dimensions ); |
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return $this->is_resized = true; |
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} |
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/** |
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* Generates size data for usage in $metadata['sizes'];. |
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* |
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* @param array $size_data Array of width, height, and crop properties of a size. |
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* |
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* @return array|\WP_Error An array containing file, width, height, and mime-type keys and it's values. WP_Error on failure. |
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*/ |
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public function get_size( $size_data ) { |
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$is_resized = $this->resize( $size_data ); |
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if ( true === is_wp_error( $is_resized ) ) { |
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return $is_resized; |
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} |
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return array( |
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'file' => $this->get_filename(), |
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'width' => $this->get_width(), |
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'height' => $this->get_height(), |
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'mime-type' => $this->get_mime_type(), |
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); |
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} |
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/** |
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* Resets the image to it's original dimensions. |
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* |
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* @return bool True on successful reset to original dimensions. |
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*/ |
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public function reset_to_original() { |
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$this->width = $this->original_width; |
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$this->height = $this->original_height; |
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$this->is_resized = false; |
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return true; |
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} |
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/** |
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* Return the basename filename. If the image has been resized, including |
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* the resizing params for Jetpack CDN. |
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* |
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* @return string Basename of the filename. |
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*/ |
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public function get_filename() { |
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return wp_basename( $this->get_raw_filename() ); |
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} |
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/** |
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* Return the absolute filename. If the image has been resized, including |
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* the resizing params for Jetpack CDN. |
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* |
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* @return string Filename. |
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*/ |
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public function get_raw_filename() { |
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return $this->is_resized() ? $this->get_resized_filename() : $this->filename; |
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} |
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/** |
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* Returns current image width. Either original, or after resize. |
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* |
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* @return int |
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*/ |
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public function get_width() { |
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return (int) $this->width; |
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} |
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/** |
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* Returns current image height. Either original, or after resize. |
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* |
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* @return int |
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*/ |
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public function get_height() { |
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return (int) $this->height; |
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} |
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/** |
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* Returns image mime type. |
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* |
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* @return string|WP_Error Image's mime type or WP_Error if it was not determined. |
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*/ |
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public function get_mime_type() { |
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return $this->mime_type; |
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} |
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/** |
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* Checks the resize status of the image. |
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* |
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* @return bool If the image has been resized. |
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*/ |
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public function is_resized() { |
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return ( true === $this->is_resized ); |
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} |
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/** |
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* Get filename with proper args for the Photon service. |
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* |
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* @return string Filename with query args for Photon service |
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*/ |
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protected function get_resized_filename() { |
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$query_args = array( |
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'resize' => join( |
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',', |
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array( |
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$this->get_width(), |
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$this->get_height(), |
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) |
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), |
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); |
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return add_query_arg( $query_args, $this->filename ); |
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} |
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/** |
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* Get resize dimensions used for the Jetpack CDN service. |
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* |
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* Converts the list of values returned from `image_resize_dimensions()` to |
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* associative array for the sake of more readable code no relying on index |
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* nor `list`. |
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* |
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* @param int $max_width |
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* @param int $max_height |
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* @param bool|array $crop |
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* |
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* @return array|\WP_Error Array of dimensions matching the parameters to imagecopyresampled. WP_Error on failure. |
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*/ |
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protected function image_resize_dimensions( $max_width, $max_height, $crop ) { |
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$dimensions = image_resize_dimensions( $this->original_width, $this->original_height, $max_width, $max_height, $crop ); |
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if ( ! $dimensions ) { |
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return new WP_Error( 'error_getting_dimensions', __( 'Could not calculate resized image dimensions' ), $this->filename ); |
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} |
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return array_combine( |
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array( |
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'dst_x', |
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'dst_y', |
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'src_x', |
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'src_y', |
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'dst_w', |
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'dst_h', |
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'src_w', |
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'src_h', |
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), |
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$dimensions |
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); |
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} |
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/** |
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* Sets proper width and height from dimensions. |
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* |
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* @param array $dimensions an array of image dimensions. |
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* @return void |
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*/ |
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protected function set_width_height( $dimensions ) { |
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$this->width = (int) $dimensions['dst_w']; |
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$this->height = (int) $dimensions['dst_h']; |
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} |
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} |
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