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904862da90
More testing has revealed that the `image_editor_output_format` filter has some interesting edge cases that developers should be aware of when electing to use this filter (see #53667 and #53668). Because this is a new filter that was intended to be used for experimenting with different ways to handle generating image sizes and has not yet been adopted in the wild, expanding the inline documentation is an acceptable temporary solution while these edge cases are explored further and addressed. Props mikeschroder, antpb, desrosj, adamsilverstein, ianmjones. See #5366, #53668, #35725. Built from https://develop.svn.wordpress.org/trunk@51442 git-svn-id: http://core.svn.wordpress.org/trunk@51053 1a063a9b-81f0-0310-95a4-ce76da25c4cd
604 lines
16 KiB
PHP
604 lines
16 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 = 82;
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/**
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* Each instance handles a single file.
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*
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* @param string $file Path to the file to load.
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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 subclass.
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*
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* @since 3.5.0
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*
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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 subclass.
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*
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* @since 3.5.0
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*
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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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* @abstract
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*
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* @return true|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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* @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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* @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 true|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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* @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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* @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 true|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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* @abstract
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*
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* @param float $angle
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* @return true|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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* @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 true|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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* @abstract
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*
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* @param string $mime_type The mime type of the image.
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* @return true|WP_Error True on success, WP_Error object on failure.
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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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*
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* @return array {
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* Dimensions of the image.
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*
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* @type int $width The image width.
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* @type int $height The image height.
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* }
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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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*
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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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*
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* @return int 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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*
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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 === $quality ) {
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/**
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* Filters the default image compression quality setting.
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*
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* Applies only during initial editor instantiation, or when set_quality() is run
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* manually without the `$quality` argument.
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*
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* The WP_Image_Editor::set_quality() method 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' === $this->mime_type ) {
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/**
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* Filters the JPEG compression quality for backward-compatibility.
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*
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* Applies only during initial editor instantiation, or when set_quality() is run
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* manually without the `$quality` argument.
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*
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* The WP_Image_Editor::set_quality() method 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 backward 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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*
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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( $file_ext );
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} else {
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// If no file specified, grab editor's current extension and mime-type.
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$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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/**
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* Filters the image editor output format mapping.
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*
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* Enables filtering the mime type used to save images. By default,
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* the mapping array is empty, so the mime type matches the source image.
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*
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* This should be considered experimental as there are a few edge cases that
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* still need to be solved.
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*
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* When this filter is used in combination with the {@see 'wp_editor_set_quality'}
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* filter, the image quality value used will be that of the original mime type,
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* not the mapped one. This could result in unexpected image quality for generated
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* images. See https://core.trac.wordpress.org/ticket/53667 for more details.
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*
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* When a mime type is mapped to another, and two images with the same name are
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* uploaded (image.jpg and image.webp, for example), the generated images for one
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* will potentially overwrite the other's.
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* See https://core.trac.wordpress.org/ticket/53668 for more details.
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*
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* @see WP_Image_Editor::get_output_format()
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*
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* @since 5.8.0
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*
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* @param string[] $output_format {
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* An array of mime type mappings. Maps a source mime type to a new
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* destination mime type. Default empty array.
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*
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* @type string ...$0 The new mime type.
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* }
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* @param string $filename Path to the image.
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* @param string $mime_type The source image mime type.
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* }
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*/
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$output_format = apply_filters( 'image_editor_output_format', array(), $filename, $mime_type );
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if ( isset( $output_format[ $mime_type ] )
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&& $this->supports_mime_type( $output_format[ $mime_type ] )
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) {
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$mime_type = $output_format[ $mime_type ];
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$new_ext = $this->get_extension( $mime_type );
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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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* Filters 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 ( $filename ) {
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$dir = pathinfo( $filename, PATHINFO_DIRNAME );
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$ext = pathinfo( $filename, PATHINFO_EXTENSION );
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$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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*
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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 = $this->get_suffix();
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}
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$dir = pathinfo( $this->file, PATHINFO_DIRNAME );
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$ext = pathinfo( $this->file, PATHINFO_EXTENSION );
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$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 ) ) {
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if ( ! wp_is_stream( $dest_path ) ) {
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$_dest_path = realpath( $dest_path );
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if ( $_dest_path ) {
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$dir = $_dest_path;
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}
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} else {
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$dir = $dest_path;
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}
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}
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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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*
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* @return string|false suffix
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*/
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public function get_suffix() {
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if ( ! $this->get_size() ) {
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return false;
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}
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return "{$this->size['width']}x{$this->size['height']}";
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}
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/**
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* Check if a JPEG image has EXIF Orientation tag and rotate it if needed.
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*
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* @since 5.3.0
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*
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* @return bool|WP_Error True if the image was rotated. False if not rotated (no EXIF data or the image doesn't need to be rotated).
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* WP_Error if error while rotating.
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*/
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public function maybe_exif_rotate() {
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$orientation = null;
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if ( is_callable( 'exif_read_data' ) && 'image/jpeg' === $this->mime_type ) {
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$exif_data = @exif_read_data( $this->file );
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if ( ! empty( $exif_data['Orientation'] ) ) {
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$orientation = (int) $exif_data['Orientation'];
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}
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}
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/**
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* Filters the `$orientation` value to correct it before rotating or to prevemnt rotating the image.
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*
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* @since 5.3.0
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*
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* @param int $orientation EXIF Orientation value as retrieved from the image file.
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* @param string $file Path to the image file.
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*/
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$orientation = apply_filters( 'wp_image_maybe_exif_rotate', $orientation, $this->file );
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if ( ! $orientation || 1 === $orientation ) {
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return false;
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}
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switch ( $orientation ) {
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case 2:
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// Flip horizontally.
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$result = $this->flip( true, false );
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break;
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case 3:
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// Rotate 180 degrees or flip horizontally and vertically.
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// Flipping seems faster and uses less resources.
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$result = $this->flip( true, true );
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break;
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case 4:
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// Flip vertically.
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$result = $this->flip( false, true );
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break;
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case 5:
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// Rotate 90 degrees counter-clockwise and flip vertically.
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$result = $this->rotate( 90 );
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if ( ! is_wp_error( $result ) ) {
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$result = $this->flip( false, true );
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}
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break;
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case 6:
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// Rotate 90 degrees clockwise (270 counter-clockwise).
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$result = $this->rotate( 270 );
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break;
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case 7:
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// Rotate 90 degrees counter-clockwise and flip horizontally.
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$result = $this->rotate( 90 );
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if ( ! is_wp_error( $result ) ) {
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$result = $this->flip( true, false );
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}
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break;
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case 8:
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// Rotate 90 degrees counter-clockwise.
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$result = $this->rotate( 90 );
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break;
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}
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return $result;
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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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*
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* @param string $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, $arguments ) {
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$stream = wp_is_stream( $filename );
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if ( $stream ) {
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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 ) );
|
|
}
|
|
|
|
$result = call_user_func_array( $function, $arguments );
|
|
|
|
if ( $result && $stream ) {
|
|
$contents = ob_get_contents();
|
|
|
|
$fp = fopen( $filename, 'w' );
|
|
|
|
if ( ! $fp ) {
|
|
ob_end_clean();
|
|
return false;
|
|
}
|
|
|
|
fwrite( $fp, $contents );
|
|
fclose( $fp );
|
|
}
|
|
|
|
if ( $stream ) {
|
|
ob_end_clean();
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Returns first matched mime-type from extension,
|
|
* as mapped from wp_get_mime_types()
|
|
*
|
|
* @since 3.5.0
|
|
*
|
|
* @param string $extension
|
|
* @return string|false
|
|
*/
|
|
protected static function get_mime_type( $extension = null ) {
|
|
if ( ! $extension ) {
|
|
return false;
|
|
}
|
|
|
|
$mime_types = wp_get_mime_types();
|
|
$extensions = array_keys( $mime_types );
|
|
|
|
foreach ( $extensions as $_extension ) {
|
|
if ( preg_match( "/{$extension}/i", $_extension ) ) {
|
|
return $mime_types[ $_extension ];
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns first matched extension from Mime-type,
|
|
* as mapped from wp_get_mime_types()
|
|
*
|
|
* @since 3.5.0
|
|
*
|
|
* @param string $mime_type
|
|
* @return string|false
|
|
*/
|
|
protected static function get_extension( $mime_type = null ) {
|
|
$extensions = explode( '|', array_search( $mime_type, wp_get_mime_types(), true ) );
|
|
|
|
if ( empty( $extensions[0] ) ) {
|
|
return false;
|
|
}
|
|
|
|
return $extensions[0];
|
|
}
|
|
}
|
|
|