On Mon, Oct 09, 2023 at 04:22:29PM +0200, Javier Martinez Canillas wrote: > Thomas Zimmermann <tzimmermann@xxxxxxx> writes: > > Store an instance of struct drm_format_conv_state in the shadow-plane > > state struct drm_shadow_plane_state. Many drivers with shadow planes > > use DRM's format helpers to copy or convert the framebuffer data to > > backing storage in the scanout buffer. The shadow plane provides the > > necessary state and manages the conversion's intermediate buffer memory. > > > > I would argue this is one of the primary selling points for this series > (since Maxime was asking about the motivation). As you point out, many > drivers that use a shadow-buffer can also expose a different format than > the native one to user-space, so makes sense to have the buffer used for > conversion as a part of the shadow-plane state. I'm confused, can we convert between formats or not? Or is it about XRGB8888 vs whatever native format is used by the device? Maxime
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