From 8e96c2d78e07a15e042d724ae94dee93c1691340 Mon Sep 17 00:00:00 2001
From: nick black <dankamongmen@gmail.com>
Date: Sat, 30 Nov 2019 23:30:46 -0500
Subject: [PATCH] ncplane backgrounds: render and use i nsliding-demo #69

---
 src/demo/sliding.c  | 7 ++++++-
 src/lib/notcurses.c | 6 +++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/demo/sliding.c b/src/demo/sliding.c
index b97052fc7..58575ef95 100644
--- a/src/demo/sliding.c
+++ b/src/demo/sliding.c
@@ -85,7 +85,8 @@ fill_chunk(struct ncplane* n, int idx){
     if(ncplane_cursor_move_yx(n, (maxy - 1) / 2, (maxx - 3) / 2)){
       return -1;
     }
-    ncplane_fg_rgb8(n, 224, 224, 224);
+    ncplane_fg_rgb8(n, 255 - r, 255 - g, 255 - b);
+    ncplane_bg_rgb8(n, r, g, b);
     if(ncplane_putstr(n, buf) <= 0){
       return -1;
     }
@@ -96,6 +97,10 @@ fill_chunk(struct ncplane* n, int idx){
   cell_release(n, &lr);
   cell_release(n, &hl);
   cell_release(n, &vl);
+  cell bg = CELL_TRIVIAL_INITIALIZER;
+  cell_set_bg(&bg, r, g, b);
+  ncplane_set_background(n, &bg);
+  cell_release(n, &bg);
   return 0;
 }
 
diff --git a/src/lib/notcurses.c b/src/lib/notcurses.c
index a1d6bd7ba..2446f8440 100644
--- a/src/lib/notcurses.c
+++ b/src/lib/notcurses.c
@@ -963,7 +963,11 @@ visible_cell(const notcurses* nc, int y, int x, const ncplane** retp){
     if(poffy < p->leny && poffy >= 0){
       if(poffx < p->lenx && poffx >= 0){
         *retp = p;
-        return &p->fb[fbcellidx(p, poffy, poffx)];
+        const cell* vis = &p->fb[fbcellidx(p, poffy, poffx)];
+        if(vis->gcluster == 0){
+          vis = &p->background;
+        }
+        return vis;
       }
     }
     p = p->z;