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	backend/drm: add libliftoff composition layer
This will be useful for implementing the output layers API.
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					 3 changed files with 16 additions and 9 deletions
				
			
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			@ -292,6 +292,14 @@ static bool init_libliftoff(struct wlr_drm_backend *drm) {
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			return false;
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		}
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		crtc->liftoff_composition_layer = liftoff_layer_create(crtc->liftoff);
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		if (!crtc->liftoff_composition_layer) {
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			wlr_log(WLR_ERROR, "Failed to create liftoff composition layer");
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			return false;
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		}
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		liftoff_output_set_composition_layer(crtc->liftoff,
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			crtc->liftoff_composition_layer);
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		if (crtc->primary) {
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			crtc->primary->liftoff_layer = liftoff_layer_create(crtc->liftoff);
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			if (!crtc->primary->liftoff_layer) {
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			@ -387,6 +395,7 @@ void finish_drm_resources(struct wlr_drm_backend *drm) {
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			free(crtc->cursor);
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		}
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		liftoff_layer_destroy(crtc->liftoff_composition_layer);
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		liftoff_output_destroy(crtc->liftoff);
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	}
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			@ -49,8 +49,8 @@ static void rollback_blob(struct wlr_drm_backend *drm,
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	}
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}
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static bool set_plane_props(struct wlr_drm_plane *plane, int32_t x, int32_t y,
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		uint64_t zpos) {
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static bool set_plane_props(struct wlr_drm_plane *plane,
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		struct liftoff_layer *layer, int32_t x, int32_t y, uint64_t zpos) {
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	struct wlr_drm_fb *fb = plane_get_next_fb(plane);
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	if (fb == NULL) {
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		wlr_log(WLR_ERROR, "Failed to acquire FB");
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			@ -60,7 +60,6 @@ static bool set_plane_props(struct wlr_drm_plane *plane, int32_t x, int32_t y,
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	uint32_t width = fb->wlr_buf->width;
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	uint32_t height = fb->wlr_buf->height;
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	struct liftoff_layer *layer = plane->liftoff_layer;
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	return liftoff_layer_set_property(layer, "zpos", zpos) == 0 &&
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		liftoff_layer_set_property(layer, "SRC_X", 0) == 0 &&
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		liftoff_layer_set_property(layer, "SRC_Y", 0) == 0 &&
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			@ -111,10 +110,13 @@ static bool liftoff_crtc_commit(struct wlr_drm_connector *conn,
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		add_prop(req, crtc->id, crtc->props.active, state->active);
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	if (state->active) {
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		ok = ok && set_plane_props(crtc->primary, 0, 0, 0);
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		ok = ok &&
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			set_plane_props(crtc->primary, crtc->primary->liftoff_layer, 0, 0, 0) &&
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			set_plane_props(crtc->primary, crtc->liftoff_composition_layer, 0, 0, 0);
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		if (crtc->cursor) {
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			if (drm_connector_is_cursor_visible(conn)) {
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				ok = ok && set_plane_props(crtc->cursor,
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					crtc->cursor->liftoff_layer,
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					conn->cursor_x, conn->cursor_y, 1);
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			} else {
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				ok = ok && disable_plane(crtc->cursor);
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			@ -139,11 +141,6 @@ static bool liftoff_crtc_commit(struct wlr_drm_connector *conn,
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		goto out;
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	}
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	if (liftoff_layer_needs_composition(crtc->primary->liftoff_layer)) {
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		wlr_drm_conn_log(conn, WLR_DEBUG, "Failed to scan-out primary plane");
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		ok = false;
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		goto out;
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	}
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	if (crtc->cursor &&
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			liftoff_layer_needs_composition(crtc->cursor->liftoff_layer)) {
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		wlr_drm_conn_log(conn, WLR_DEBUG, "Failed to scan-out cursor plane");
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