Reduce the amount of redundant drawing in the game area.

[rrace.git] / src / game.h

diff --git a/src/game.h b/src/game.h
index fb2fe9767135e8bfe97bab3cf2bfe46ab035a9a3..301dfac022c87681b9be53b88f96bc91dd1b01b0 100644 (file)
--- a/src/game.h
+++ b/src/game.h
@@ -111,6 +111,46 @@ static inline uint_fast32_t board_mask_v(int x, int y0, int y1)
        return (col << 5*y1) & (col >> 5*(4-y0));
 }
 
+/*
+ * Return the board bitmap setting locations on or above row y.
+ */
+static inline uint_fast32_t board_above(int y)
+{
+       uint_fast32_t val = board_row(y);
+
+       return val | (val-1);
+}
+
+/*
+ * Return the board bitmap setting locations on or below row y.
+ */
+static inline uint_fast32_t board_below(int y)
+{
+       uint_fast32_t val = board_row(y);
+
+       return val | (~val + 1);
+}
+
+/*
+ * Return the board bitmap setting locations on or left of column x.
+ */
+static inline uint_fast32_t board_left(int x)
+{
+       uint_fast32_t val = board_column(x);
+
+       return val | (val - 0x108421);
+}
+
+/*
+ * Return the board bitmap setting locations on or right of column x.
+ */
+static inline uint_fast32_t board_right(int x)
+{
+       uint_fast32_t val = board_column(x);
+
+       return ~val + 0x108421;
+}
+
 /*
  * Move the bits in the game bitmaps according to a move at position (x, y),
  * and update the location of the empty position which, if the move was valid