drmkit-capture

Read back what a CRTC is scanning out, and write it to a file.

snapshot composites the planes bound to a CRTC into an Image the size of its active mode, reading each plane's buffer back through a dma-buf. write_png puts one on disk.

This is a readback path, not a rendering one: it reads buffers that already exist and blends them on the CPU exactly as the display controller would. What it cannot read -- tiled buffers, YUV, anything not host-mappable -- it skips with a warning rather than failing the capture, because a screenshot missing its video overlay is more use than no screenshot.

Part of drmkit, a Rust port of drm-cxx. API documentation is on docs.rs.

License

MIT, matching drm-cxx.