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- mr.2615
- mr.2616
- mr.2620
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c/compositor: Support compensation for rolling scanout HMDs

Implements per-scanline timewarp to correct projection distortion on devices with rolling (non-global) refresh patterns (fixes #508). This addresses visual artifacts on HMDs that refresh line-by-line rather than all at once.

**Limitations**: Currently only supports top-to-bottom scanout direction.