A zoomed view needs the pixels it shows at the zoom scale, not a whole-frame
texture stretched over them. RenderRequest gains an optional PixelWindow of the
virtual full output that max_w x max_h describes; only the window is
materialized. It is Frame:🪟 the crop rectangle narrows to the window
(flips as drawn), so sampling, masks, spots, red eye and the lens warp need no
change. The post-crop vignette keeps the whole frame's geometry (Frame::view)
and dehaze uses the whole frame's airlight (estimated on a 384 px render), so a
window matches the same pixels of the full render. The GPU renderer declines
windowed requests (CPU for now).
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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