Method "Exact" for WP Image Editor, will return the image with the exactly size requested, scaling it if necessary.

wp_image_editor_method_exact.php

/*
*  Method "exact" for WP Image Editor
*
*  Usage: exact($image, array(200, 200, true)) using same "resize" arguments from WP Image Editor.
*  https://codex.wordpress.org/Class_Reference/WP_Image_Editor
*
*  @description: Return the exact size from an image, scaling it when necessary.
*  @created: 31/07/15
*  @param object $image - The WP Image Editor instance
*  @param array	$args - The same arguments from "resize" method
*/
function exact($image, $args) {
	
	$orig_size = $image->get_size();
	$orig_w = $orig_size['width'];
	$orig_h = $orig_size['height'];
	
	$dest_w = $args[0];
	$dest_h = $args[1];
	
	$ratio = 1;

	if($orig_w < $dest_w)
		$ratio = $dest_w / $orig_w;
				
	if($orig_h < $dest_h) {
		$ratio_h = $dest_h / $orig_h;
		if($ratio_h > $ratio)
			$ratio = $ratio_h;
	}

	if($ratio > 1) {
		$new_w = ceil($orig_w * $ratio);
		$new_h = ceil($orig_h * $ratio);
		$image->crop(0, 0, $orig_w, $orig_h, $new_w, $new_h);
	}
	
	call_user_func_array(array($image, 'resize'), $args);
	
}

// Testing
$image = wp_get_image_editor('image.jpg');
exact($image, array(200, 200, true));
$image->stream();