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GloDroid / glodroid_manifest

Android port that aims to bring both user- and developer-friendly experience in using AOSP with a set of single-board computers (SBC), phones and other devices.
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Add sunxi v4l2 rotation engine support to the drm_hwcomposer #66

Open rsglobal opened 4 years ago

rsglobal commented 4 years ago

Sunxi display controlled has no support for rotated planes. Instead it offers separate IP core to rotate buffer, which is exposed to user as v4l2 driver.

To off-load GPU with changed orientation, we can use that driver.

Case 1: No rotation [hwc layer 1] -> [drm_plane 1] [hwc layer 2] -> [drm_plane 2]

Case 2: Changed orientation

[hwc layer 1] -> [Rotate layer into new buffer, cache it] -> [drm_plane 1] [hwc layer 2] -> [Rotate layer into new buffer, cache it] -> [drm_plane 2]

rsglobal commented 4 years ago

Link to the driver: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/media/platform/sunxi/sun8i-rotate?h=v5.9-rc2&id=d77182ada3d40854735eb9321ce30de60c2abdbb

rsglobal commented 3 years ago

@matviizorin

Assignment removed due to long inactivity. Please update it if you are still working on the issue.