Introduce WP_Image_Editor, WP_Image_Editor_Imagick, and WP_Image_Editor_GD. Abstracts image editing API and adds support for ImageMagick.

Props DH-Shredder, kurtpayne, markoheijnen
see #6821


git-svn-id: http://core.svn.wordpress.org/trunk@22094 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -1295,9 +1295,21 @@ function wp_get_original_referer() {
  * @return bool Whether the path was created. True if path already exists.
  */
 function wp_mkdir_p( $target ) {
+	$wrapper = null;
+
+	// strip the protocol
+	if( wp_is_stream( $target ) ) {
+		list( $wrapper, $target ) = explode( '://', $target, 2 );
+	}
+
 	// from php.net/mkdir user contributed notes
 	$target = str_replace( '//', '/', $target );
 
+	// put the wrapper back on the target
+	if( $wrapper !== null ) {
+		$target = $wrapper . '://' . $target;
+	}
+
 	// safe mode fails with a trailing slash under certain PHP versions.
 	$target = rtrim($target, '/'); // Use rtrim() instead of untrailingslashit to avoid formatting.php dependency.
 	if ( empty($target) )
@@ -3749,6 +3761,19 @@ function _device_can_upload() {
 	return true;
 }
 
+/**
+ * Test if a given path is a stream URL
+ *
+ * @param string $path The resource path or URL
+ * @return bool True if the path is a stream URL
+ */
+function wp_is_stream( $path ) {
+	$wrappers = stream_get_wrappers();
+	$wrappers_re = '(' . join('|', $wrappers) . ')';
+
+	return preg_match( "!^$wrappers_re://!", $path ) === 1;
+}
+
 /**
  * Test if the supplied date is valid for the Gregorian calendar
  *