Wine shows each palette index in a colour of its own

What to know

2026-10-24, crates/hud/tests/screenshot.rs, derived/truth/run3/shots/run3-out.png.

The recorded frames come from the original under Wine's DirectDraw in an emulated PC. Their colours are not the palette's: index 0x34, which HARDWAR.PAL sets to (248, 136, 36) (the 6-bit values shifted left by 2), is (255, 138, 33) in the shot (measured). The mapping is the same for every pixel of an index, but it is not a simple rescaling of the 6-bit values.

So compare a frame by position, not by RGB: learn each index's colour in the shot from the pixels the port draws in that index, then require every such pixel to have it, and no other pixel of the compared region to have it. The window's client area is at (24, 50) in the 800 x 600 shots (border and title bar). Whether a Windows machine shows the palette's colours is unknown.