fbcon_wipe: build up auxvec

src/lib/kitty.c

@@ -387,6 +387,9 @@ sprixel* kitty_recycle(ncplane* n){
 int kitty_wipe(sprixel* s, int ycell, int xcell){
 //fprintf(stderr, "NEW WIPE %d %d/%d\n", s->id, ycell, xcell);
   uint8_t* auxvec = sprixel_auxiliary_vector(s);
+  if(auxvec == NULL){
+    return -1;
+  }
   const int totalpixels = s->pixy * s->pixx;
   const int xpixels = s->cellpxx;
   const int ypixels = s->cellpxy;

src/lib/linux.c

@@ -2,11 +2,17 @@
 #include "internal.h"
 
 int fbcon_wipe(sprixel* s, int ycell, int xcell){
+  uint8_t* auxvec = sprixel_auxiliary_vector(s);
+  if(auxvec == NULL){
+    return -1;
+  }
   char* glyph = s->glyph;
   for(int y = 0 ; y < s->cellpxy ; ++y){
     size_t offset = (ycell * s->dimx + xcell) * 4;
     // FIXME need preserve auxvec
     for(int x = 0 ; x < s->cellpxx ; ++x){
+      const int vyx = (y % s->cellpxy) * s->cellpxx + (x % s->cellpxx);
+      auxvec[vyx] = glyph[offset + 3];
       glyph[offset + 3] = 0;
       offset += 4;
     }

src/lib/sixel.c

@@ -210,6 +210,9 @@ wipe_color(sixelmap* smap, int color, int sband, int eband,
 int sixel_wipe(sprixel* s, int ycell, int xcell){
 //fprintf(stderr, "WIPING %d/%d\n", ycell, xcell);
   uint8_t* auxvec = sprixel_auxiliary_vector(s);
+  if(auxvec == NULL){
+    return -1;
+  }
   memset(auxvec + s->cellpxx * s->cellpxy, 0xff, s->cellpxx * s->cellpxy);
   sixelmap* smap = s->smap;
   const int startx = xcell * s->cellpxx;