the magic code (experimental)

source/funkin/system/OptimizedBitmapData.hx

@@ -0,0 +1,56 @@
+package funkin.system;
+
+import lime.graphics.Image;
+import openfl.geom.Rectangle;
+import openfl.display.BitmapData;
+import lime.graphics.cairo.CairoImageSurface;
+
+class OptimizedBitmapData extends BitmapData {
+	@SuppressWarnings("checkstyle:Dynamic")
+	@:noCompletion private override function __fromImage(image:#if lime Image #else Dynamic #end):Void
+	{
+		#if lime
+		if (image != null && image.buffer != null)
+		{
+			this.image = image;
+
+			width = image.width;
+			height = image.height;
+			rect = new Rectangle(0, 0, image.width, image.height);
+
+			__textureWidth = width;
+			__textureHeight = height;
+
+			#if sys
+			image.format = BGRA32;
+			image.premultiplied = true;
+			#end
+
+			__isValid = true;
+			readable = true;
+
+			lock();
+			getTexture(FlxG.stage.context3D);
+			getSurface();
+
+			readable = true;
+			this.image = null;
+		}
+		#end
+	}
+
+	@SuppressWarnings("checkstyle:Dynamic")
+	@:dox(hide) public override function getSurface():#if lime CairoImageSurface #else Dynamic #end
+	{
+		#if lime
+		if (__surface == null)
+		{
+			__surface = CairoImageSurface.fromImage(image);
+		}
+
+		return __surface;
+		#else
+		return null;
+		#end
+	}
+}