javascript - Defining transpency in bmp files -


a game i'm researching, has textures on interface. textures in-game transparent. game old (1999) , textures saved .bmp. here sample texture file:

sample texture interface file

this game written in c++.

here's question: how possible, game understands parts of .bmp, black, transparent surface? can give me idea, how define 1 well? i'm working in canvas (javascript, babylonjs), need idea, not code.


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