Transparent Desktop Window Background Confusion

Haxe
#1

I’m a beginner in Haxe and OpenFL in general but I wanted to see if it’s possible to create a borderless window (can do this) which contains a png image but a transparent background (stage) without having this rectangle window area appearing, yet no matter how much I look up online I can’t find an answer to this specific thing.

Expected (Something like this which I’ve seen done in Flash):
transparentsplash

Current:

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Screen Shot 2018-10-08 at 7.22.06 PM.jpg1117×647 136 KB

.hx file:

package;


import openfl.display.Bitmap;
import openfl.display.BitmapData;
import openfl.display.Sprite;
import openfl.Assets;
import openfl.Lib;

class Main extends Sprite {
	
	
	public function new () {
		
		super ();
		var bitmap = new Bitmap (Assets.getBitmapData ("assets/openfl.png"));

		bitmap.x = (stage.stageWidth - bitmap.width) / 2;
		bitmap.y = (stage.stageHeight - bitmap.height) / 2;
		//stage.alpha=0; //making it 0 will make everything disappear
		//stage.opaqueBackground=0;
		stage.color=0x000000;
		
		addChild (bitmap);

	}
	
	
}

.xml file:

<?xml version="1.0" encoding="utf-8"?>
<project>
	
	<meta title="Displaying a Bitmap" package="org.openfl.samples.displayingabitmap" version="1.0.0" company="OpenFL" />
	<app main="Main" path="Export" file="DisplayingABitmap" />
	<window borderless="true"/>


	<source path="Source"/>
	
	<haxelib name="openfl"/>
	
	<assets path="Assets" rename="assets" />
	
</project>

Thank you so much for your time :heart_eyes:

#2

Maybe try <window background="null" />?

#3

Tried it before but didn’t do anything :frowning:

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Screen Shot 2018-10-08 at 9.49.44 PM.png1117×647 42.1 KB

#4

We do have code within OpenFL that supports a null stage color. stage.color = null might also do it. However, I believe I tried to do what you are trying to do, and I think I had trouble with the SDL2 window context working with a transparent background. It might have been that I wasn’t testing borderless, though, or it might not have been supported on all desktops

#5

So far nothing significant has changed even without borderless, isn’t there any workaround this issue? Maybe a method here and there in Lime? Or maybe instead of extending Sprite, I extend Application and try to do some sort of a Custom Rendering?

#6

The first question is if we can get a transparent context from SDL2. I think the last I looked (at least one or or two platforms) it was hard-coded to not allow alpha in the OpenGL context. That I think would be the trickiest part if it is not supported. Otherwise, we can certainly sort out our end – we do support transparent GL contexts in our HTML5 target for sure

#7

Is there any update on this? The OpenFL and Lime release notes include mentions of this but it still doesnt seem to be working

1 Like
#8

Try this?