5 files changed, 146 insertions, 1 deletions

diff --git a/src/Bindings/LuaState.cpp b/src/Bindings/LuaState.cpp
index 38e008b2a..ed31e678f 100644
--- a/src/Bindings/LuaState.cpp
+++ b/src/Bindings/LuaState.cpp
@@ -937,6 +937,18 @@ void cLuaState::GetStackValue(int a_StackPos, AString & a_Value)
 
 
 
+void cLuaState::GetStackValue(int a_StackPos, BLOCKTYPE & a_ReturnedVal)
+{
+	if (lua_isnumber(m_LuaState, a_StackPos))
+	{
+		a_ReturnedVal = static_cast<BLOCKTYPE>(tolua_tonumber(m_LuaState, a_StackPos, a_ReturnedVal));
+	}
+}
+
+
+
+
+
 void cLuaState::GetStackValue(int a_StackPos, bool & a_ReturnedVal)
 {
 	a_ReturnedVal = (tolua_toboolean(m_LuaState, a_StackPos, a_ReturnedVal ? 1 : 0) > 0);
@@ -995,6 +1007,24 @@ void cLuaState::GetStackValue(int a_StackPos, int & a_ReturnedVal)
 
 
 
+void cLuaState::GetStackValue(int a_StackPos, pBlockArea & a_ReturnedVal)
+{
+	if (lua_isnil(m_LuaState, a_StackPos))
+	{
+		a_ReturnedVal = nullptr;
+		return;
+	}
+	tolua_Error err;
+	if (tolua_isusertype(m_LuaState, a_StackPos, "cBlockArea", false, &err))
+	{
+		a_ReturnedVal = *(reinterpret_cast<cBlockArea **>(lua_touserdata(m_LuaState, a_StackPos)));
+	}
+}
+
+
+
+
+
 void cLuaState::GetStackValue(int a_StackPos, pBoundingBox & a_ReturnedVal)
 {
 	if (lua_isnil(m_LuaState, a_StackPos))
@@ -1005,7 +1035,7 @@ void cLuaState::GetStackValue(int a_StackPos, pBoundingBox & a_ReturnedVal)
 	tolua_Error err;
 	if (tolua_isusertype(m_LuaState, a_StackPos, "cBoundingBox", false, &err))
 	{
-		a_ReturnedVal = *((cBoundingBox **)lua_touserdata(m_LuaState, a_StackPos));
+		a_ReturnedVal = *(reinterpret_cast<cBoundingBox **>(lua_touserdata(m_LuaState, a_StackPos)));
 	}
 }
 
diff --git a/src/Bindings/LuaState.h b/src/Bindings/LuaState.h
index a6e121eb7..6bedbf5ec 100644
--- a/src/Bindings/LuaState.h
+++ b/src/Bindings/LuaState.h
@@ -37,6 +37,7 @@ extern "C"
 
 
 
+class cBlockArea;
 class cBlockEntity;
 class cBoundingBox;
 class cChunkDesc;
@@ -68,6 +69,7 @@ struct HTTPRequest;
 struct HTTPTemplateRequest;
 struct TakeDamageInfo;
 
+typedef cBlockArea *     pBlockArea;
 typedef cBoundingBox *   pBoundingBox;
 typedef cMapManager *    pMapManager;
 typedef cPluginManager * pPluginManager;
@@ -244,11 +246,13 @@ public:
 	// GetStackValue() retrieves the value at a_StackPos, if it is a valid type. If not, a_Value is unchanged.
 	// Enum values are clamped to their allowed range.
 	void GetStackValue(int a_StackPos, AString & a_Value);
+	void GetStackValue(int a_StackPos, BLOCKTYPE & a_Value);
 	void GetStackValue(int a_StackPos, bool & a_Value);
 	void GetStackValue(int a_StackPos, cRef & a_Ref);
 	void GetStackValue(int a_StackPos, double & a_Value);
 	void GetStackValue(int a_StackPos, eWeather & a_Value);
 	void GetStackValue(int a_StackPos, int & a_Value);
+	void GetStackValue(int a_StackPos, pBlockArea & a_Value);
 	void GetStackValue(int a_StackPos, pBoundingBox & a_Value);
 	void GetStackValue(int a_StackPos, pMapManager & a_Value);
 	void GetStackValue(int a_StackPos, pPluginManager & a_Value);
diff --git a/src/Bindings/ManualBindings.cpp b/src/Bindings/ManualBindings.cpp
index c4b12aa84..8e909827c 100644
--- a/src/Bindings/ManualBindings.cpp
+++ b/src/Bindings/ManualBindings.cpp
@@ -3187,6 +3187,44 @@ static int tolua_cBlockArea_GetOrigin(lua_State * tolua_S)
 
 
 
+static int tolua_cBlockArea_GetNonAirCropRelCoords(lua_State * tolua_S)
+{
+	// function cBlockArea::GetNonAirCropRelCoords()
+	// Exported manually because tolua would generate extra input params for the outputs
+	
+	cLuaState L(tolua_S);
+	if (!L.CheckParamUserType(1, "cBlockArea"))
+	{
+		return 0;
+	}
+	
+	cBlockArea * self = nullptr;
+	BLOCKTYPE IgnoreBlockType = E_BLOCK_AIR;
+	L.GetStackValues(1, self, IgnoreBlockType);
+	if (self == nullptr)
+	{
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetNonAirCropRelCoords'", nullptr);
+		return 0;
+	}
+	
+	// Calculate the crop coords:
+	int MinRelX, MinRelY, MinRelZ, MaxRelX, MaxRelY, MaxRelZ;
+	self->GetNonAirCropRelCoords(MinRelX, MinRelY, MinRelZ, MaxRelX, MaxRelY, MaxRelZ, IgnoreBlockType);
+
+	// Push the six crop coords:
+	L.Push(MinRelX);
+	L.Push(MinRelY);
+	L.Push(MinRelZ);
+	L.Push(MaxRelX);
+	L.Push(MaxRelY);
+	L.Push(MaxRelZ);
+	return 6;
+}
+
+
+
+
+
 static int tolua_cBlockArea_GetRelBlockTypeMeta(lua_State * tolua_S)
 {
 	// function cBlockArea::GetRelBlockTypeMeta()
@@ -3687,6 +3725,7 @@ void ManualBindings::Bind(lua_State * tolua_S)
 			tolua_function(tolua_S, "GetBlockTypeMeta",        tolua_cBlockArea_GetBlockTypeMeta);
 			tolua_function(tolua_S, "GetCoordRange",           tolua_cBlockArea_GetCoordRange);
 			tolua_function(tolua_S, "GetOrigin",               tolua_cBlockArea_GetOrigin);
+			tolua_function(tolua_S, "GetNonAirCropRelCoords",  tolua_cBlockArea_GetNonAirCropRelCoords);
 			tolua_function(tolua_S, "GetRelBlockTypeMeta",     tolua_cBlockArea_GetRelBlockTypeMeta);
 			tolua_function(tolua_S, "GetSize",                 tolua_cBlockArea_GetSize);
 			tolua_function(tolua_S, "LoadFromSchematicFile",   tolua_cBlockArea_LoadFromSchematicFile);
diff --git a/src/BlockArea.cpp b/src/BlockArea.cpp
index 4c3da0535..7526e1c32 100644
--- a/src/BlockArea.cpp
+++ b/src/BlockArea.cpp
@@ -1614,6 +1614,73 @@ void cBlockArea::GetRelBlockTypeMeta(int a_RelX, int a_RelY, int a_RelZ, BLOCKTY
 
 
 
+void cBlockArea::GetNonAirCropRelCoords(int & a_MinRelX, int & a_MinRelY, int & a_MinRelZ, int & a_MaxRelX, int & a_MaxRelY, int & a_MaxRelZ, BLOCKTYPE a_IgnoreBlockType)
+{
+	// Check if blocktypes are valid:
+	if (m_BlockTypes == nullptr)
+	{
+		LOGWARNING("%s: BlockTypes have not been read!", __FUNCTION__);
+		a_MinRelX = 1;
+		a_MaxRelX = 0;
+		return;
+	}
+
+	// Walk all the blocks and find the min and max coords for the non-ignored ones:
+	int MaxX = 0, MinX = m_Size.x - 1;
+	int MaxY = 0, MinY = m_Size.y - 1;
+	int MaxZ = 0, MinZ = m_Size.z - 1;
+	for (int y = 0; y < m_Size.y; y++)
+	{
+		for (int z = 0; z < m_Size.z; z++)
+		{
+			for (int x = 0; x < m_Size.x; x++)
+			{
+				if (m_BlockTypes[MakeIndex(x, y, z)] == a_IgnoreBlockType)
+				{
+					continue;
+				}
+				// The block is not ignored, update any coords that need updating:
+				if (x < MinX)
+				{
+					MinX = x;
+				}
+				if (x > MaxX)
+				{
+					MaxX = x;
+				}
+				if (y < MinY)
+				{
+					MinY = y;
+				}
+				if (y > MaxY)
+				{
+					MaxY = y;
+				}
+				if (z < MinZ)
+				{
+					MinZ = z;
+				}
+				if (z > MaxZ)
+				{
+					MaxZ = z;
+				}
+			}  // for x
+		}  // for z
+	}  // for y
+
+	// Assign to the output:
+	a_MinRelX = MinX;
+	a_MinRelY = MinY;
+	a_MinRelZ = MinZ;
+	a_MaxRelX = MaxX;
+	a_MaxRelY = MaxY;
+	a_MaxRelZ = MaxZ;
+}
+
+
+
+
+
 int cBlockArea::GetDataTypes(void) const
 {
 	int res = 0;
diff --git a/src/BlockArea.h b/src/BlockArea.h
index 348e960dd..6b8b30443 100644
--- a/src/BlockArea.h
+++ b/src/BlockArea.h
@@ -288,6 +288,11 @@ public:
 	bool HasBlockSkyLights(void) const { return (m_BlockSkyLight != nullptr); }
 	
 	// tolua_end
+
+	/** Returns the minimum and maximum coords in each direction for the first non-ignored block in each direction.
+	If there are no non-ignored blocks within the area, or blocktypes are not present, the returned values are reverse-ranges (MinX <- m_RangeX, MaxX <- 0 etc.)
+	Exported to Lua in ManualBindings.cpp. */
+	void GetNonAirCropRelCoords(int & a_MinRelX, int & a_MinRelY, int & a_MinRelZ, int & a_MaxRelX, int & a_MaxRelY, int & a_MaxRelZ, BLOCKTYPE a_IgnoreBlockType = E_BLOCK_AIR);
 	
 	// Clients can use these for faster access to all blocktypes. Be careful though!
 	/** Returns the internal pointer to the block types */