(btn) == CURSOR_DOWN ? D : (btn) == CURSOR_UP ? U :\
(btn) == CURSOR_LEFT ? L : R)
-static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
+static char *interpret_move(game_state *state, game_ui *ui, const game_drawstate *ds,
int x, int y, int button)
{
int w = state->shared->w, h = state->shared->h /*, sz = state->shared->sz */;