From 420c967605b380daf4a16344d1e1aab588eca0b9 Mon Sep 17 00:00:00 2001
From: nick black <dankamongmen@gmail.com>
Date: Fri, 16 Apr 2021 08:08:11 -0400
Subject: [PATCH] [postpaint_cell] don't damage cells hidden by sprixel #1527

---
 src/lib/internal.h | 1 +
 src/lib/render.c   | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/lib/internal.h b/src/lib/internal.h
index 265223b0c..b3864ba9a 100644
--- a/src/lib/internal.h
+++ b/src/lib/internal.h
@@ -948,6 +948,7 @@ static inline bool sprixel_kitty_p(const tinfo* t){
 static inline sprixcell_e sprixel_state(sprixel* s, int y, int x){
   int localy = y - s->n->absy;
   int localx = x - s->n->absx;
+//fprintf(stderr, "TAM %d at %d/%d (%d/%d)\n", s->n->tacache[localy * s->dimx + localx], localy, localx, y, x);
   return s->n->tacache[localy * s->dimx + localx];
 }
 
diff --git a/src/lib/render.c b/src/lib/render.c
index 01b011043..024bf85dd 100644
--- a/src/lib/render.c
+++ b/src/lib/render.c
@@ -386,7 +386,13 @@ postpaint_cell(nccell* lastframe, int dimx, struct crender* crender,
   nccell* prevcell = &lastframe[fbcellidx(y, dimx, *x)];
   if(cellcmp_and_dupfar(pool, prevcell, crender->p, targc) > 0){
 //fprintf(stderr, "damaging due to cmp\n");
-    crender->s.damaged = 1;
+    if(crender->sprixel){
+      if(!crender->s.p_beats_sprixel && sprixel_state(crender->sprixel, y, *x) != SPRIXCELL_OPAQUE){
+        crender->s.damaged = 1;
+      }
+    }else{
+      crender->s.damaged = 1;
+    }
     assert(!nccell_wide_right_p(targc));
     const int width = targc->width;
     for(int i = 1 ; i < width ; ++i){