Astra_Ext_Transparent_Header_Markup::replace_trans_header_attr( array $attr, object $attachment, sting $size )

		public function replace_trans_header_attr( $attr, $attachment, $size ) {

			$trans_logo     = astra_get_option( 'transparent-header-logo' );
			$custom_logo_id = attachment_url_to_postid( $trans_logo );

			if ( $custom_logo_id == $attachment->ID ) {

				$attach_data = array();
				if ( ! is_customize_preview() ) {
					$attach_data = wp_get_attachment_image_src( $attachment->ID, 'ast-transparent-logo-size' );
					if ( isset( $attach_data[0] ) ) {
						$attr['src'] = $attach_data[0];
					}
				}

				$file_type      = wp_check_filetype( $attr['src'] );
				$file_extension = $file_type['ext'];

				if ( 'svg' == $file_extension ) {
					$attr['class'] = 'astra-logo-svg';
				}

				$diff_retina_logo = astra_get_option( 'different-transparent-retina-logo' );

				if ( '1' == $diff_retina_logo ) {

					$retina_logo = astra_get_option( 'transparent-header-retina-logo' );

					$attr['srcset'] = '';

					if ( apply_filters( 'astra_transparent_header_retina', true ) && '' !== $retina_logo ) {
						$cutom_logo     = wp_get_attachment_image_src( $custom_logo_id, 'full' );
						$cutom_logo_url = $cutom_logo[0];

						if ( astra_check_is_ie() ) {
							// Replace header logo url to retina logo url.
							$attr['src'] = $retina_logo;
						}

						$attr['srcset'] = $cutom_logo_url . ' 1x, ' . $retina_logo . ' 2x';

					}
				}
			}

			return $attr;
		}