iterm: position cursor before draw

src/lib/iterm.c

@@ -10,27 +10,32 @@
 // yank a cell out of the PNG by setting all of its alphas to 0. the alphas
 // will be preserved in the auxvec.
 int iterm_wipe(sprixel* s, int ycell, int xcell){
-  return 0;
+  (void)s;     // FIXME
+  (void)ycell;
+  (void)xcell;
+  return -1;
 }
 
 // build a cell of the PNG back up by copying auxvec alphas to it.
 int iterm_rebuild(sprixel* s, int ycell, int xcell, uint8_t* auxvec){
-  return 0;
+  (void)s;      // FIXME
+  (void)ycell;
+  (void)xcell;
+  (void)auxvec;
+  return -1;
 }
 
 // spit out the control sequence and data.
 int iterm_draw(const ncpile *p, sprixel* s, FILE* out, int y, int x){
+  if(goto_location(p->nc, out, y, x)){
+    return -1;
+  }
   if(fwrite(s->glyph, s->glyphlen, 1, out) != 1){
     return -1;
   }
   return s->glyphlen;
 }
 
-// damage any cells underneath the graphic, destroying it.
-int iterm_scrub(const ncpile* p, sprixel* s){
-  return 0;
-}
-
 static int
 write_iterm_graphic(sprixel* s, const void* data, int leny, int stride, int lenx){
   s->glyph = NULL;