• Ander Conselvan de Oliveira's avatar
    compositor-drm: refactor to avoid unnecessary allocation of KMS FBs · 555c17dd
    Ander Conselvan de Oliveira authored
    Currently, the drm backend will create and destroy a KMS FB for each
    frame. However, the bos for a gbm surface are reused (at least with
    mesa) so we can store the fb_id on it and destroy it only on the bo's
    destroy callback.
    
    To use the same path for scanning out client buffers, some refactor
    was needed. Previously, the bo for the client buffer was destroyed
    early so that gbm_surface_release_buffer() would not be called with
    it, since at the page flip handler output->scanout_buffer can be
    NULL even if the current frame is a client buffer.
    
    This was solved by adding a drm_fb structure that holds a gbm_bo,
    an fb_id, and information about the fb coming from a client buffer
    or not. A drm_fb is created in such a way that it is destroyed
    whenever the bo it references is destroyed. The fields current_*
    and next_* in drm_output are changed into only two pointers to
    drm_fb's.
    555c17dd
compositor-drm.c 46.5 KB