How to make a Solid-Color (No Shadow) Text outline?

Question

I am trying to outline a certain piece of text with a single specific color. This is for a game that has a restricted color pallete.

I have a Label with a theme that modifies the default font. I set the "Outline Color" of the DynamicFont to my desired color and have an Outline size of 2.

However, as it is, the outline is not a solid color - It behaves like a shadow and will make up extra colors to feather out the edges:

How to I modify this so that the outline is a single color?

P.S. There seems to be a property called "Shadow As Outline" which appears to be related to the problem, but changing this value (or any other constants in this category) from the default 0 does not seem to have any effect.

Answer 1

The way I've fixed this issue is by stepping the alpha value at a certain threshold. Which means that transparent pixels will be either completely opaque or completely invisible.

shader_type canvas_item;

void fragment() {
    float alpha = texture(TEXTURE, UV).a;
    COLOR.a = step(0.5, alpha);
}

example of transparent outline

result of applying the shader