d6558477d7
When the linux-dmabuf protocol is available, prefer it over the old wl_drm protocol. Previously wl_drm was used when modifiers aren't supported, however linux-dmabuf supports formats without modifiers too. In this case, linux-dmabuf will send a DRM_FORMAT_MOD_INVALID modifier for each supported format [1]. This allows compositors to better handle these buffers, getting a DMA-BUF and implementing features like direct scan-out. A similar logic has been implemented for EGL [2]. DRM_FORMAT_MOD_INVALID is now stored in the xwl_screen->formats list. glamor_get_modifiers still returns FALSE with zero modifiers if the only advertised modifier is DRM_FORMAT_MOD_INVALID. [1]:fb9b2a8731[2]:c376865f5eSigned-off-by: Simon Ser <contact@emersion.fr> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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