+/* Value is the string under window-relative coordinates X/Y in either
+ marginal area, or nil if none. *CHARPOS is set to the position in
+ the string returned. */
+
+Lisp_Object
+marginal_area_string (w, x, y, area, charpos)
+ struct window *w;
+ int x, y;
+ int area;
+ int *charpos;
+{
+ struct glyph_row *row = w->current_matrix->rows;
+ struct glyph *glyph, *end;
+ int x0, i, wy = y;
+ Lisp_Object string = Qnil;
+
+ if (area == 6)
+ area = LEFT_MARGIN_AREA;
+ else if (area == 7)
+ area = RIGHT_MARGIN_AREA;
+ else
+ abort ();
+
+ for (i = 0; row->enabled_p && i < w->current_matrix->nrows; ++i, ++row)
+ if (wy >= row->y && wy < MATRIX_ROW_BOTTOM_Y (row))
+ break;
+
+ if (row->enabled_p)
+ {
+ /* Find the glyph under X. If we find one with a string object,
+ it's the one we were looking for. */
+ glyph = row->glyphs[area];
+ end = glyph + row->used[area];
+ if (area == RIGHT_MARGIN_AREA)
+ x0 = (window_box_width (w, TEXT_AREA)
+ + window_box_width (w, LEFT_MARGIN_AREA));
+ else
+ x0 = 0;
+ for (; glyph < end; x0 += glyph->pixel_width, ++glyph)
+ if (x >= x0 && x < x0 + glyph->pixel_width)
+ {
+ string = glyph->object;
+ *charpos = glyph->charpos;
+ break;
+ }
+ }
+
+ return string;
+}
+
+