[PATCH weston v9 19/62] compositor-drm: Rename fb_plane to scanout_plane

Daniel Stone daniels at collabora.com
Fri Mar 3 23:05:30 UTC 2017

All planes being displayed have a framebuffer. What makes 'fb_plane'
special is that it's being displayed as the primary plane by KMS.

Previous patchsets renamed this to 'primary_plane' to match the KMS
terminology, namely the CRTC's base plane, which is controlled by
drmModeSetCrtc in the legacy API, and identified by PLANE_TYPE ==
"Primary" in the universal-plane API.

However, Weston uses 'primary_plane' internally to refer to the case
where client content is _not_ directly displayed on a plane, but
composited via the renderer, with the result of the compositing then

Rename to 'scanout_plane' as our least-ambiguous name, and document it a

Signed-off-by: Daniel Stone <daniels at collabora.com>

Differential Revision: https://phabricator.freedesktop.org/D1415

Signed-off-by: Daniel Stone <daniels at collabora.com>
 libweston/compositor-drm.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index 6d4968d..7f7d936 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -224,7 +224,8 @@ struct drm_output {
 	struct gbm_surface *gbm_surface;
 	uint32_t gbm_format;
-	struct weston_plane fb_plane;
+	/* Plane currently being directly displayed by KMS */
+	struct weston_plane scanout_plane;
 	struct drm_fb *fb_current, *fb_pending, *fb_last;
 	struct drm_fb *dumb[2];
@@ -661,7 +662,7 @@ drm_output_prepare_scanout_view(struct drm_output *output,
 	drm_fb_set_buffer(output->fb_pending, buffer);
-	return &output->fb_plane;
+	return &output->scanout_plane;
 static struct drm_fb *
@@ -2685,10 +2686,10 @@ drm_output_enable(struct weston_output *base)
 	weston_plane_init(&output->cursor_plane, b->compositor,
 			  INT32_MIN, INT32_MIN);
-	weston_plane_init(&output->fb_plane, b->compositor, 0, 0);
+	weston_plane_init(&output->scanout_plane, b->compositor, 0, 0);
 	weston_compositor_stack_plane(b->compositor, &output->cursor_plane, NULL);
-	weston_compositor_stack_plane(b->compositor, &output->fb_plane,
+	weston_compositor_stack_plane(b->compositor, &output->scanout_plane,
 	weston_log("Output %s, (connector %d, crtc %d)\n",
@@ -2722,7 +2723,7 @@ drm_output_deinit(struct weston_output *base)
-	weston_plane_release(&output->fb_plane);
+	weston_plane_release(&output->scanout_plane);

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