1 files changed, 131 insertions, 0 deletions
diff --git a/src/tree_map.h b/src/tree_map.h
new file mode 100644
index 000000000..326504659
--- /dev/null
+++ b/src/tree_map.h
@@ -0,0 +1,131 @@
+/* $Id$ */
+
+#ifndef TREE_MAP_H
+#define TREE_MAP_H
+
+#include "macros.h"
+
+typedef enum TreeType {
+	TREE_INVALID      = -1,
+	TREE_TEMPERATE    = 0,
+	TREE_SUB_ARCTIC   = 12,
+	TREE_RAINFOREST   = 20,
+	TREE_CACTUS       = 27,
+	TREE_SUB_TROPICAL = 28,
+	TREE_TOYLAND      = 32
+} TreeType;
+
+enum {
+	TREE_COUNT_TEMPERATE    = TREE_SUB_ARCTIC   - TREE_TEMPERATE,
+	TREE_COUNT_SUB_ARCTIC   = TREE_RAINFOREST   - TREE_SUB_ARCTIC,
+	TREE_COUNT_RAINFOREST   = TREE_CACTUS       - TREE_RAINFOREST,
+	TREE_COUNT_SUB_TROPICAL = TREE_SUB_TROPICAL - TREE_CACTUS,
+	TREE_COUNT_TOYLAND      = 9
+};
+
+/* ground type, m2 bits 4...5
+ * valid densities (bits 6...7) in comments after the enum */
+typedef enum TreeGround {
+	TREE_GROUND_GRASS       = 0, // 0
+	TREE_GROUND_ROUGH       = 1, // 0
+	TREE_GROUND_SNOW_DESERT = 2  // 0-3 for snow, 3 for desert
+} TreeGround;
+
+
+static inline TreeType GetTreeType(TileIndex t)
+{
+	assert(IsTileType(t, MP_TREES));
+	return _m[t].m3;
+}
+
+
+static inline TreeGround GetTreeGround(TileIndex t)
+{
+	assert(IsTileType(t, MP_TREES));
+	return GB(_m[t].m2, 4, 2);
+}
+
+
+static inline uint GetTreeDensity(TileIndex t)
+{
+	assert(IsTileType(t, MP_TREES));
+	return GB(_m[t].m2, 6, 2);
+}
+
+
+static inline void SetTreeGroundDensity(TileIndex t, TreeGround g, uint d)
+{
+	assert(IsTileType(t, MP_TREES)); // XXX incomplete
+	SB(_m[t].m2, 4, 2, g);
+	SB(_m[t].m2, 6, 2, d);
+}
+
+
+static inline uint GetTreeCount(TileIndex t)
+{
+	assert(IsTileType(t, MP_TREES));
+	return GB(_m[t].m5, 6, 2);
+}
+
+static inline void AddTreeCount(TileIndex t, int c)
+{
+	assert(IsTileType(t, MP_TREES)); // XXX incomplete
+	_m[t].m5 += c << 6;
+}
+
+static inline void SetTreeCount(TileIndex t, uint c)
+{
+	assert(IsTileType(t, MP_TREES)); // XXX incomplete
+	SB(_m[t].m5, 6, 2, c);
+}
+
+
+static inline uint GetTreeGrowth(TileIndex t)
+{
+	assert(IsTileType(t, MP_TREES));
+	return GB(_m[t].m5, 0, 3);
+}
+
+static inline void AddTreeGrowth(TileIndex t, int a)
+{
+	assert(IsTileType(t, MP_TREES)); // XXX incomplete
+	_m[t].m5 += a;
+}
+
+static inline void SetTreeGrowth(TileIndex t, uint g)
+{
+	assert(IsTileType(t, MP_TREES)); // XXX incomplete
+	SB(_m[t].m5, 0, 3, g);
+}
+
+
+static inline uint GetTreeCounter(TileIndex t)
+{
+	assert(IsTileType(t, MP_TREES));
+	return GB(_m[t].m2, 0, 4);
+}
+
+static inline void AddTreeCounter(TileIndex t, int a)
+{
+	assert(IsTileType(t, MP_TREES)); // XXX incomplete
+	_m[t].m2 += a;
+}
+
+static inline void SetTreeCounter(TileIndex t, uint c)
+{
+	assert(IsTileType(t, MP_TREES)); // XXX incomplete
+	SB(_m[t].m2, 0, 4, c);
+}
+
+
+static inline void MakeTree(TileIndex t, TreeType type, uint count, uint growth, TreeGround ground, uint density)
+{
+	SetTileType(t, MP_TREES);
+	SetTileOwner(t, OWNER_NONE);
+	_m[t].m2 = density << 6 | ground << 4 | 0;
+	_m[t].m3 = type;
+	_m[t].m4 = 0 << 5 | 0 << 2;
+	_m[t].m5 = count << 6 | growth;
+}
+
+#endif /* TREE_MAP_H */