Field report with a screenshot: `btl4.exe -fit` renders tiny MFDs hugging the
corners, an over-wide world view, and a horizontally squashed scene.
CAUSE. L4VIDEO pins the windowed backbuffer to the CLIENT RECT (Gitea #56, so
a device Reset cannot silently re-derive it). That is correct precisely while
client == canvas -- true on a normal boot, and FALSE under -fit, which sizes the
window to the whole monitor BEFORE the device exists. The backbuffer came out
3440x1440 against a 1452x1059 canvas, and everything downstream disagreed:
- BTApplyWorldViewport and BTDrawCockpitPanels lay out from the BACKBUFFER,
so the canvas they drew was 3440 wide: bands unchanged, MFDs still 320x240
(hence tiny), view rect 2888x881 instead of 900x500;
- the world projection used the aspect of the INTENDED view (1.8) inside a
3.28 viewport, stretching the scene;
- Present then scaled that oversized backbuffer into the 1974x1440 letterbox,
squashing it horizontally by 0.574;
- and every button was hit-tested through gBTCockpitCanvasW/H while being
drawn in backbuffer space -- the exact #50 divergence the pinning comment
warns about, unnoticed because nothing had clicked under -fit.
FIX: when the cockpit surround is up, the backbuffer IS the canvas, whatever
the window is doing. Pin to gBTCockpitCanvasW/H and let the letterbox do the
scaling -- which is what the rest of the design already assumed. Drag-resize
was always right for this reason (the device is created while client == canvas
and a later resize does not recreate it); only -fit, which changes the client
first, exposed it.
MY EARLIER VERIFICATION WAS WRONG. I called -fit good from a screenshot that
was centred and letterboxed, without checking that the backbuffer matched the
canvas or that a single button could be clicked. Both are checked now.
Verified: -fit on 3440x1440 renders correct proportions (captured), and 72/72
buttons dispatch under -fit; surround/exploded/dock/pod/dev all boot and
simulate with zero faults.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
CydandClaude Opus 5
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