+ corners = snewn(state->w * state->h, unsigned char);
+ memset(corners, 0, state->w * state->h);
+ for (x = 0; x < state->w; x++)
+ for (y = 0; y < state->h; y++) {
+ if (x > 0) {
+ int e = index(state, vedge, x, y);
+ if (index(state,corners,x,y) < e)
+ index(state,corners,x,y) = e;
+ if (y+1 < state->h &&
+ index(state,corners,x,y+1) < e)
+ index(state,corners,x,y+1) = e;
+ }
+ if (y > 0) {
+ int e = index(state, hedge, x, y);
+ if (index(state,corners,x,y) < e)
+ index(state,corners,x,y) = e;
+ if (x+1 < state->w &&
+ index(state,corners,x+1,y) < e)
+ index(state,corners,x+1,y) = e;
+ }
+ }
+