docs: the plane rotation rule is leave or turn by the whole transform, not a subtraction - #65
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…, not a subtraction The header, the api document, the 0.5.8 changelog entry and the wrapper docs told a consumer to turn a frame by (output transform - plane rotation). The rule rustdesk ended up with, and the one the header's own reasoning supports, is binary: a frame from a plane that rotated or reflected is already upright and is left alone; a frame from a plane at rotate-0, or without the property, is turned by the whole output transform. The two are not subtracted because a compositor programs the plane from the CRTC transform, which also folds in the panel orientation of the connector, and wl_output does not carry that (read from the mutter source, not measured). Docs only; csrc/ resynced.
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📝 SummarySummary by CodeRabbit
WalkthroughDocumentation now says to leave frames unchanged when the plane rotates or reflects them. When the plane is unrotated or has no rotation property, it says to apply the full output transform. ChangesPlane Rotation Guidance
Priority: ⬇️ Low Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Other Merge Risk: 🔵 Low · up to The README gives the wrong Rust API value for a plane without a rotation property, which could mislead frame-orientation handling. Correct this localized documentation mismatch; the risk is bounded. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change updates guidance for handling captured frames, not the capture implementation or its permissions. Its main uncertainty is whether the rule holds across compositor and hardware combinations beyond those described. Retained concerns Security review detailsSecurity Blast Radius
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Inline comments:
In @bindings/rust/libdrmtap/README.md:
- Line 84: Update the `plane_rotation()` documentation to state that a plane
without a `rotation` property returns `None`, which consumers may treat as
rotate-0. Clarify that an unbound plane and property-read failures return `Err`,
while preserving the documented bitmask meanings and orientation behavior.
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CHANGELOG.mdbindings/rust/libdrmtap-sys/csrc/drmtap.hbindings/rust/libdrmtap/README.mdbindings/rust/libdrmtap/src/lib.rsdocs/research/05_api_and_architecture.mdinclude/drmtap.h
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Source excerpt: | Rule | Convention | |---|---| | Indent | 4 spaces, never tabs | | Naming: functions | `snake_case`, prefixed `drmtap_` for public API | | Naming: variables | `snake_case` | | Naming: macros/constants | `UPPER_SNAKE_CASE`,...
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bindings/rust/libdrmtap-sys/csrc/drmtap.hinclude/drmtap.h
Source excerpt: Architecture changes → update `docs/research/05_api_and_architecture.md`
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Source excerpt: Source excerpt: Public API changes → update `include/drmtap.h` comments
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🔇 Additional comments (5)
include/drmtap.h (1)
610-615: LGTM!bindings/rust/libdrmtap-sys/csrc/drmtap.h (1)
610-615: LGTM!bindings/rust/libdrmtap/src/lib.rs (1)
377-379: LGTM!docs/research/05_api_and_architecture.md (1)
184-185: LGTM!CHANGELOG.md (1)
21-24: LGTM!
…property and Err when it cannot read The README said None meant no plane bound or an unreadable property set and that a plane without the property answered Some(0x1). The wrapper returns Ok(None) for -ENOTSUP (no property, treat as rotate-0) and an Err for every other failure; lib.rs already said so.
1 participant
docs only. the header, the api document, the 0.5.8 changelog entry and the wrapper docs said a consumer turns a frame by (output transform - plane rotation). the rule is binary: a frame from a plane that rotated or reflected is already upright and is left alone; a frame from a plane at rotate-0, or without the property, is turned by the whole output transform. they are not subtracted because a compositor programs the plane from the crtc transform, which also folds in the panel orientation of the connector, and wl_output does not carry that (read from the mutter source, not measured).
this is the rule rustdesk uses (rustdesk/rustdesk#16345), verified on 26-sep with a peer connected: i915 + mutter at 180 (plane 0x4, frame left alone) and amdgpu + kwin at 180 (plane 0x1, frame turned), both upright.
files: include/drmtap.h (and csrc/ via tools/sync-crate.sh), docs/research/05_api_and_architecture.md, CHANGELOG.md (the 0.5.8 entry), bindings/rust/libdrmtap/src/lib.rs, bindings/rust/libdrmtap/README.md. tools/check-version.sh: version coherence OK. no version bump: nothing compiled changes.