Graphics1 problem

Empty.hx

package;

import kha.Framebuffer;
import kha.Game;
import kha.Image;
import kha.Loader;
import kha.Configuration;
import kha.Scaler;
import kha.Color;

class Empty extends Game {
	public function new() {
		super("Empty", false);
	}
	var backbuffer1 : Image;
	var backbuffer2 : Image;
	override public function init() {
		backbuffer1 = Image.createRenderTarget(320, 240);
		backbuffer2 = Image.createRenderTarget(320, 240);
		Configuration.setScreen(this);
	}
	override public function render(frame : Framebuffer) {
		var nextcolor = [Color.White, Color.Red, Color.Blue, Color.Green, Color.Black][Std.int(Math.random() * 5)];
		{
			var g = backbuffer1.g1;
			g.begin();
			for (y in 0...backbuffer1.height) {
				for (x in 0...backbuffer1.width) {
					g.setPixel(x,y,nextcolor);
				}
			}
			g.end();
		}
		{
			var g = backbuffer2.g2;
			g.begin();
			g.clear(nextcolor);
			g.end();
		}
		
		startRender(frame);
		
		// Flash: only black and blue
		// HTML5: only black
		Scaler.scale(backbuffer1, frame, kha.Sys.screenRotation);
		
		// Flash and HTML5: all colors show OK
		//Scaler.scale(backbuffer2, frame, kha.Sys.screenRotation);
		endRender(frame);		
		
		trace("works");
	}
}