notcurses_at_yx: return EGC for any column of wide glyph #1490

NEWS.md

@@ -15,7 +15,8 @@ rearrangements of Notcurses.
   * `ncplane_at_yx()` now returns the EGC when called on any column of a
     wide glyph. `ncplane_at_yx_cell()` continues to duplicate the exact
     `nccell`, and can thus continue to be used to distinguish between primary
-    and secondary columns of a wide glyph.
+    and secondary columns of a wide glyph. Likewise, `notcurses_at_yx()`
+    now returns the EGC when called on any column of a wide glyph.
 
 * 2.3.1 (2021-05-18)
   * Sprixels no longer interact with their associated plane's framebuffer. This

doc/man/man3/notcurses_render.3.md

@@ -93,8 +93,9 @@ If the algorithm concludes without an EGC, the cell is rendered with no glyph
 and a default background. If the algorithm concludes without a color locked in,
 the color as computed thus far is used.
 
-**notcurses_at_yx** retrieves a call *as rendered*. The EGC in that cell is
-copied and returned; it must be **free(3)**d by the caller.
+**notcurses_at_yx** retrieves a cell *as rendered*. The EGC in that cell is
+copied and returned; it must be **free(3)**d by the caller. If the cell is a
+secondary column of a wide glyph, the glyph is still returned.
 
 # RETURN VALUES
 

src/lib/render.c

@@ -1428,6 +1428,9 @@ char* notcurses_at_yx(notcurses* nc, int yoff, int xoff, uint16_t* stylemask, ui
     if(yoff >= 0 && yoff < nc->lfdimy){
       if(xoff >= 0 || xoff < nc->lfdimx){
         const nccell* srccell = &nc->lastframe[yoff * nc->lfdimx + xoff];
+        if(nccell_wide_right_p(srccell)){
+          return notcurses_at_yx(nc, yoff, xoff - 1, stylemask, channels);
+        }
         if(stylemask){
           *stylemask = srccell->stylemask;
         }