[PATCH weston v11 11/13] compositor-drm: Don't repaint if no damage

[Daniel Stone]

If we don't have any damage for the primary plane, then don't force a
repaint; simply reuse the old buffer we already have.

Signed-off-by: Daniel Stone <dani...@collabora.com>
---
 libweston/compositor-drm.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index bf3273ba..ca4146a5 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -1507,6 +1507,7 @@ drm_output_render(struct drm_output_state *state, 
pixman_region32_t *damage)
        struct drm_output *output = state->output;
        struct weston_compositor *c = output->base.compositor;
        struct drm_plane_state *scanout_state;
+       struct drm_plane *scanout_plane = output->scanout_plane;
        struct drm_backend *b = to_drm_backend(c);
        struct drm_fb *fb;
 
@@ -1517,10 +1518,20 @@ drm_output_render(struct drm_output_state *state, 
pixman_region32_t *damage)
        if (scanout_state->fb)
                return;
 
-       if (b->use_pixman)
+       if (!pixman_region32_not_empty(damage) &&
+           scanout_plane->state_cur->fb &&
+           (scanout_plane->state_cur->fb->type == BUFFER_GBM_SURFACE ||
+            scanout_plane->state_cur->fb->type == BUFFER_PIXMAN_DUMB) &&
+           scanout_plane->state_cur->fb->width ==
+               output->base.current_mode->width &&
+           scanout_plane->state_cur->fb->height ==
+               output->base.current_mode->height) {
+               fb = drm_fb_ref(scanout_plane->state_cur->fb);
+       } else if (b->use_pixman) {
                fb = drm_output_render_pixman(state, damage);
-       else
+       } else {
                fb = drm_output_render_gl(state, damage);
+       }
 
        if (!fb) {
                drm_plane_state_put_back(scanout_state);
-- 
2.13.3

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