Function import_copy_target 

pub fn import_copy_target(
    device: &Device,
    image: &DmabufRef<'_>,
) -> Result<ImportedRenderTarget, ImportError>

Import the one linear plane of an ABGR8888/XBGR8888 dma-buf as a texture a frame is copied into (COPY_DST).

The render service draws each app’s frame into a retained Rgba8Unorm target and copies what changed into the buffer the app then attaches to its surface. These formats store R, G, B, A bytes in memory order, which is Rgba8Unorm, so that copy is a plain copy_texture_to_texture with no format conversion, and the compositor composites or scans the buffer out as it would any client’s.

With VK_EXT_image_drm_format_modifier the producer’s exact row pitch is used (a GBM buffer’s pitch is aligned for scanout); without it the driver’s own linear pitch has to agree.

Errors

As import_render_target, for another format or a tiled layout.