Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/imagify/inc/common/attachments.php

@@ -0,0 +1,69 @@
+<?php
+defined( 'ABSPATH' ) || die( 'Cheatin’ uh?' );
+
+add_action( 'delete_attachment', 'imagify_trigger_delete_attachment_hook' );
+/**
+ * Trigger a common Imagify hook when an attachment is deleted.
+ *
+ * @since  1.9
+ * @author Grégory Viguier
+ *
+ * @param int $post_id Attachment ID.
+ */
+function imagify_trigger_delete_attachment_hook( $post_id ) {
+	$process = imagify_get_optimization_process( $post_id, 'wp' );
+
+	if ( ! $process->is_valid() ) {
+		return;
+	}
+
+	imagify_trigger_delete_media_hook( $process );
+}
+
+add_action( 'imagify_delete_media', 'imagify_cleanup_after_media_deletion' );
+/**
+ * Delete the backup file and the WebP files when an attachement is deleted.
+ *
+ * @since  1.9
+ * @author Grégory Viguier
+ *
+ * @param ProcessInterface $process An optimization process.
+ */
+function imagify_cleanup_after_media_deletion( $process ) {
+	if ( 'wp' !== $process->get_media()->get_context() ) {
+		return;
+	}
+
+	/**
+	 * The optimization data will be automatically deleted by WP (post metas).
+	 * Delete the WebP versions and the backup file.
+	 */
+	$process->delete_webp_files();
+	$process->delete_backup();
+}
+
+add_filter( 'ext2type', 'imagify_add_webp_type' );
+/**
+ * Add the WebP extension to wp_get_ext_types().
+ *
+ * @since  1.9
+ * @author Grégory Viguier
+ *
+ * @param  array $ext2type Multi-dimensional array with extensions for a default set of file types.
+ * @return array
+ */
+function imagify_add_webp_type( $ext2type ) {
+	if ( ! in_array( 'webp', $ext2type['image'], true ) ) {
+		$ext2type['image'][] = 'webp';
+	}
+	return $ext2type;
+}
+
+/**
+ * Set WP’s "big images threshold" to Imagify’s resizing value.
+ *
+ * @since  1.9.8
+ * @since  WP 5.3
+ * @author Grégory Viguier
+ */
+add_filter( 'big_image_size_threshold', [ imagify_get_context( 'wp' ), 'get_resizing_threshold' ], IMAGIFY_INT_MAX );