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docs: kernel version, pixel layout, the helper copy and frame lifetimes - #70
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- GETFB2 is in mainline since 5.7 (455e00f1412f), not 4.20; Ubuntu 20.04 runs it as a backport in its 5.4. - A converted frame is XRGB8888, but a linear 8-bit scanout keeps its own order (reduce_linear_to_xrgb8888 leaves 8-bit formats alone); frame->format says which. - Through the helper a linear scanout on a real GPU is copied, not exported: drmtap_grab then returns pixels and dma_buf_fd -1. grab() and data() in the Rust wrapper say so too. - drmtap_grab_mapped says how long frame->data lives and points at drmtap_frame_owns_data(). - The FP16 note only promises the linear case.
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WalkthroughCapture documentation now distinguishes converted pixels from linear scanouts that retain their format. It also describes helper-mediated copies, frame data lifetimes, FP16 conversion, and kernel requirements for tiled or modifier framebuffers. ChangesCapture Documentation
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Other Merge Risk: 🔵 Low · up to The README may lead Rust users to decode zero-copy frames using the wrong pixel layout; clarify the distinction between 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Review comments at @bindings/rust/libdrmtap/README.md:
- Around line 7-9: Update the README’s frame-format description to limit the
four-byte, 8-bit pixel guarantee to frames returned by grab_mapped(). Describe
grab() separately as potentially returning an unconverted DMA-BUF scanout whose
pixel layout depends on the source format.
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AGENTS.mdREADME.mdbindings/rust/libdrmtap-sys/README.mdbindings/rust/libdrmtap-sys/csrc/drmtap.hbindings/rust/libdrmtap/README.mdbindings/rust/libdrmtap/src/lib.rsinclude/drmtap.h
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Source excerpt: | Rule | Convention | |---|---| | Indent | 4 spaces, never tabs | Source excerpt: | Rule | Convention | |---|---| | Naming: functions | `snake_case`, prefixed `drmtap_` for public API | Source excerpt: | Rule | Convention |...
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Documentation only. The pixel paragraph of both crate READMEs now ties the 8-bit layout to the mapped grab and says that grab() converts nothing (CodeRabbit on #70).
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docs only: what the readmes, the header and the rust docs said that the code does not do.
1- kernel:
GETFB2is in mainline since 5.7 (455e00f1412f), not 4.20. ubuntu 20.04 runs it as a backport in its 5.4 (LP: #1863874, since 5.4.0-16.19).2- pixel layout: a converted frame is
XRGB8888, but a linear 8-bit scanout comes back in its own order (reduce_linear_to_xrgb8888leaves 8-bit formats alone), andframe->formatsays which.3- the helper exports a tiled or virtio-gpu scanout as a dma-buf and copies the pixels of a linear one, so
drmtap_grabcan return pixels withdma_buf_fd-1. the rustgrab()anddata()docs say it too.4-
drmtap_grab_mappedsays how longframe->datalives and points atdrmtap_frame_owns_data().5- the fp16 note only promises the linear case; the tiled one is a separate code fix.
meson test 13/13, cargo test with doctests green, csrc resynced, version coherence ok.