494 lines
12 KiB
PHP
494 lines
12 KiB
PHP
<?php
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/**
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* Base WordPress Image Editor
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*
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* @package WordPress
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* @subpackage Image_Editor
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*/
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/**
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* Base image editor class from which implementations extend
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*
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* @since 3.5.0
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*/
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abstract class WP_Image_Editor {
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protected $file = null;
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protected $size = null;
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protected $mime_type = null;
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protected $default_mime_type = 'image/jpeg';
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protected $quality = false;
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protected $default_quality = 90;
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/**
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* Each instance handles a single file.
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*/
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public function __construct( $file ) {
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$this->file = $file;
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}
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/**
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* Checks to see if current environment supports the editor chosen.
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* Must be overridden in a sub-class.
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*
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* @since 3.5.0
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*
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* @static
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* @access public
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* @abstract
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*
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* @param array $args
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* @return bool
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*/
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public static function test( $args = array() ) {
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return false;
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}
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/**
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* Checks to see if editor supports the mime-type specified.
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* Must be overridden in a sub-class.
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*
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* @since 3.5.0
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*
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* @static
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* @access public
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* @abstract
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*
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* @param string $mime_type
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* @return bool
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*/
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public static function supports_mime_type( $mime_type ) {
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return false;
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}
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/**
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* Loads image from $this->file into editor.
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*
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* @since 3.5.0
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* @access protected
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* @abstract
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*
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* @return bool|WP_Error True if loaded; WP_Error on failure.
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*/
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abstract public function load();
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/**
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* Saves current image to file.
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*
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* @since 3.5.0
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* @access public
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* @abstract
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*
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* @param string $destfilename
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* @param string $mime_type
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* @return array|WP_Error {'path'=>string, 'file'=>string, 'width'=>int, 'height'=>int, 'mime-type'=>string}
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*/
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abstract public function save( $destfilename = null, $mime_type = null );
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/**
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* Resizes current image.
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*
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* At minimum, either a height or width must be provided.
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* If one of the two is set to null, the resize will
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* maintain aspect ratio according to the provided dimension.
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*
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* @since 3.5.0
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* @access public
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* @abstract
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*
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* @param int|null $max_w Image width.
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* @param int|null $max_h Image height.
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* @param bool $crop
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* @return bool|WP_Error
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*/
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abstract public function resize( $max_w, $max_h, $crop = false );
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/**
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* Resize multiple images from a single source.
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*
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* @since 3.5.0
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* @access public
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* @abstract
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*
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* @param array $sizes {
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* An array of image size arrays. Default sizes are 'small', 'medium', 'large'.
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*
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* @type array $size {
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* @type int $width Image width.
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* @type int $height Image height.
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* @type bool $crop Optional. Whether to crop the image. Default false.
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* }
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* }
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* @return array An array of resized images metadata by size.
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*/
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abstract public function multi_resize( $sizes );
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/**
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* Crops Image.
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*
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* @since 3.5.0
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* @access public
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* @abstract
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*
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* @param int $src_x The start x position to crop from.
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* @param int $src_y The start y position to crop from.
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* @param int $src_w The width to crop.
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* @param int $src_h The height to crop.
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* @param int $dst_w Optional. The destination width.
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* @param int $dst_h Optional. The destination height.
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* @param bool $src_abs Optional. If the source crop points are absolute.
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* @return bool|WP_Error
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*/
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abstract public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false );
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/**
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* Rotates current image counter-clockwise by $angle.
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*
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* @since 3.5.0
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* @access public
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* @abstract
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*
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* @param float $angle
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* @return bool|WP_Error
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*/
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abstract public function rotate( $angle );
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/**
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* Flips current image.
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*
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* @since 3.5.0
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* @access public
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* @abstract
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*
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* @param bool $horz Flip along Horizontal Axis
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* @param bool $vert Flip along Vertical Axis
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* @return bool|WP_Error
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*/
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abstract public function flip( $horz, $vert );
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/**
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* Streams current image to browser.
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*
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* @since 3.5.0
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* @access public
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* @abstract
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*
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* @param string $mime_type
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* @return bool|WP_Error
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*/
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abstract public function stream( $mime_type = null );
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/**
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* Gets dimensions of image.
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*
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* @since 3.5.0
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* @access public
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*
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* @return array {'width'=>int, 'height'=>int}
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*/
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public function get_size() {
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return $this->size;
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}
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/**
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* Sets current image size.
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*
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* @since 3.5.0
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* @access protected
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*
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* @param int $width
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* @param int $height
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* @return true
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*/
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protected function update_size( $width = null, $height = null ) {
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$this->size = array(
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'width' => (int) $width,
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'height' => (int) $height
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);
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return true;
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}
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/**
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* Gets the Image Compression quality on a 1-100% scale.
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*
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* @since 4.0.0
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* @access public
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*
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* @return int $quality Compression Quality. Range: [1,100]
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*/
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public function get_quality() {
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if ( ! $this->quality ) {
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$this->set_quality();
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}
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return $this->quality;
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}
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/**
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* Sets Image Compression quality on a 1-100% scale.
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*
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* @since 3.5.0
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* @access public
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*
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* @param int $quality Compression Quality. Range: [1,100]
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* @return true|WP_Error True if set successfully; WP_Error on failure.
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*/
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public function set_quality( $quality = null ) {
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if ( null === $quality ) {
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/**
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* Filter the default image compression quality setting.
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*
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* Applies only during initial editor instantiation, or when set_quality() is run
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* manually without the `$quality` argument.
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*
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* set_quality() has priority over the filter.
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*
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* @since 3.5.0
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*
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* @param int $quality Quality level between 1 (low) and 100 (high).
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* @param string $mime_type Image mime type.
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*/
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$quality = apply_filters( 'wp_editor_set_quality', $this->default_quality, $this->mime_type );
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if ( 'image/jpeg' == $this->mime_type ) {
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/**
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* Filter the JPEG compression quality for backward-compatibility.
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*
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* Applies only during initial editor instantiation, or when set_quality() is run
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* manually without the `$quality` argument.
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*
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* set_quality() has priority over the filter.
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*
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* The filter is evaluated under two contexts: 'image_resize', and 'edit_image',
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* (when a JPEG image is saved to file).
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*
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* @since 2.5.0
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*
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* @param int $quality Quality level between 0 (low) and 100 (high) of the JPEG.
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* @param string $context Context of the filter.
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*/
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$quality = apply_filters( 'jpeg_quality', $quality, 'image_resize' );
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}
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if ( $quality < 0 || $quality > 100 ) {
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$quality = $this->default_quality;
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}
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}
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// Allow 0, but squash to 1 due to identical images in GD, and for backwards compatibility.
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if ( 0 === $quality ) {
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$quality = 1;
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}
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if ( ( $quality >= 1 ) && ( $quality <= 100 ) ) {
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$this->quality = $quality;
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return true;
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} else {
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return new WP_Error( 'invalid_image_quality', __('Attempted to set image quality outside of the range [1,100].') );
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}
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}
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/**
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* Returns preferred mime-type and extension based on provided
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* file's extension and mime, or current file's extension and mime.
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*
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* Will default to $this->default_mime_type if requested is not supported.
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*
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* Provides corrected filename only if filename is provided.
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*
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* @since 3.5.0
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* @access protected
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*
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* @param string $filename
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* @param string $mime_type
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* @return array { filename|null, extension, mime-type }
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*/
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protected function get_output_format( $filename = null, $mime_type = null ) {
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$new_ext = null;
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// By default, assume specified type takes priority
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if ( $mime_type ) {
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$new_ext = $this->get_extension( $mime_type );
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}
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if ( $filename ) {
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$file_ext = strtolower( pathinfo( $filename, PATHINFO_EXTENSION ) );
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$file_mime = $this->get_mime_type( $file_ext );
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}
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else {
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// If no file specified, grab editor's current extension and mime-type.
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$file_ext = strtolower( pathinfo( $this->file, PATHINFO_EXTENSION ) );
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$file_mime = $this->mime_type;
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}
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// Check to see if specified mime-type is the same as type implied by
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// file extension. If so, prefer extension from file.
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if ( ! $mime_type || ( $file_mime == $mime_type ) ) {
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$mime_type = $file_mime;
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$new_ext = $file_ext;
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}
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// Double-check that the mime-type selected is supported by the editor.
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// If not, choose a default instead.
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if ( ! $this->supports_mime_type( $mime_type ) ) {
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/**
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* Filter default mime type prior to getting the file extension.
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*
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* @see wp_get_mime_types()
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*
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* @since 3.5.0
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*
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* @param string $mime_type Mime type string.
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*/
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$mime_type = apply_filters( 'image_editor_default_mime_type', $this->default_mime_type );
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$new_ext = $this->get_extension( $mime_type );
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}
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if ( $filename ) {
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$ext = '';
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$info = pathinfo( $filename );
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$dir = $info['dirname'];
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if ( isset( $info['extension'] ) )
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$ext = $info['extension'];
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$filename = trailingslashit( $dir ) . wp_basename( $filename, ".$ext" ) . ".{$new_ext}";
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}
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return array( $filename, $new_ext, $mime_type );
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}
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/**
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* Builds an output filename based on current file, and adding proper suffix
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*
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* @since 3.5.0
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* @access public
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*
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* @param string $suffix
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* @param string $dest_path
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* @param string $extension
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* @return string filename
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*/
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public function generate_filename( $suffix = null, $dest_path = null, $extension = null ) {
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// $suffix will be appended to the destination filename, just before the extension
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if ( ! $suffix )
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$suffix = $this->get_suffix();
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$info = pathinfo( $this->file );
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$dir = $info['dirname'];
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$ext = $info['extension'];
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$name = wp_basename( $this->file, ".$ext" );
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$new_ext = strtolower( $extension ? $extension : $ext );
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if ( ! is_null( $dest_path ) && $_dest_path = realpath( $dest_path ) )
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$dir = $_dest_path;
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return trailingslashit( $dir ) . "{$name}-{$suffix}.{$new_ext}";
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}
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/**
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* Builds and returns proper suffix for file based on height and width.
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*
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* @since 3.5.0
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* @access public
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*
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* @return false|string suffix
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*/
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public function get_suffix() {
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if ( ! $this->get_size() )
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return false;
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return "{$this->size['width']}x{$this->size['height']}";
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}
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/**
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* Either calls editor's save function or handles file as a stream.
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*
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* @since 3.5.0
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* @access protected
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*
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* @param string|stream $filename
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* @param callable $function
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* @param array $arguments
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* @return bool
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*/
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protected function make_image( $filename, $function, $arguments ) {
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if ( $stream = wp_is_stream( $filename ) ) {
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ob_start();
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} else {
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// The directory containing the original file may no longer exist when using a replication plugin.
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wp_mkdir_p( dirname( $filename ) );
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}
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$result = call_user_func_array( $function, $arguments );
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if ( $result && $stream ) {
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$contents = ob_get_contents();
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$fp = fopen( $filename, 'w' );
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if ( ! $fp )
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return false;
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fwrite( $fp, $contents );
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fclose( $fp );
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}
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if ( $stream ) {
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ob_end_clean();
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}
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return $result;
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}
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/**
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* Returns first matched mime-type from extension,
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* as mapped from wp_get_mime_types()
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*
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* @since 3.5.0
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*
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* @static
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* @access protected
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*
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* @param string $extension
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* @return string|false
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*/
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protected static function get_mime_type( $extension = null ) {
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if ( ! $extension )
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return false;
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$mime_types = wp_get_mime_types();
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$extensions = array_keys( $mime_types );
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foreach( $extensions as $_extension ) {
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if ( preg_match( "/{$extension}/i", $_extension ) ) {
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return $mime_types[$_extension];
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}
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}
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return false;
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}
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/**
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* Returns first matched extension from Mime-type,
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* as mapped from wp_get_mime_types()
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*
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* @since 3.5.0
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*
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* @static
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* @access protected
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*
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* @param string $mime_type
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* @return string|false
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*/
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protected static function get_extension( $mime_type = null ) {
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$extensions = explode( '|', array_search( $mime_type, wp_get_mime_types() ) );
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if ( empty( $extensions[0] ) )
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return false;
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return $extensions[0];
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}
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}
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