Slightly improved first two functions in init.lua, added protection support.

init.lua

@@ -15,30 +15,37 @@ Codezeilen und schreibe das auch nicht dran.
 
 ]]--
 
+local protector = minetest.get_modpath ("protector")
+
+-- Detect stopping colors.
+function tga_encoder.image:detect_stop_colors(icon, pos, stop_colors)
+   local x = pos.x
+   local z = pos.z
+   for i_z = 1,#icon do
+      for i_x = 1,#icon[i_z] do
+	 if stop_colors[self.pixels[z + i_z][x + i_x][1]] then
+			   return true
+	 end
+      end
+   end
+end
+
 -- blit an icon into the image unless its rect overlaps pixels that
 -- have any of the stop_colors, treating a nil pixel as transparent   
 function tga_encoder.image:blit_icon(icon, pos, stop_colors)
 	local x = pos.x
 	local z = pos.z
-	local overlap = false
-	for i_z = 1,#icon do
-		for i_x = 1,#icon[i_z] do
-			local color = self.pixels[z + i_z][x + i_x][1]
-			if stop_colors[color] then
-				overlap = true
-				break
-			end
-		end
-		if overlap then
-			break
-		end
-	end
-	if overlap then
+
+	-- Just as the comment above says, exit IMMEDIATELY if there
+	-- are stop_colors present in the image.
+	if self:detect_stop_colors(icon, pos, stop_colors) then
 	   return
 	end
+	
 	for i_z = 1,#icon do
 	   for i_x = 1,#icon[i_z] do
 	      local color = icon[i_z][i_x][1]
+	      
 	      if color then
 		 self.pixels[z + i_z][x + i_x] = { color }
 	      end
@@ -65,11 +72,11 @@ local worldpath = minetest.get_worldpath()
 local textures_dir = worldpath .. "/xmaps/"
 minetest.mkdir(textures_dir)
 
-xmaps.get_map_filename = function(map_id)
+function xmaps.get_map_filename(map_id)
    return "xmaps_map_texture_" .. map_id .. ".tga"
 end
 
-xmaps.create_map_item = function(pos, properties)
+function xmaps.create_map_item(pos, properties)
    properties = properties or {}
 
    local itemstack = ItemStack("xmaps:map")
@@ -78,6 +85,8 @@ xmaps.create_map_item = function(pos, properties)
    local map_id = tostring(os.time() + math.random())
    meta:set_string("xmaps:id", map_id)
    
+   -- Size is defined above
+   -- I love this, it's so clever
    local minp = vector.multiply(vector.floor(vector.divide(pos, size)), size)
    meta:set_string("xmaps:minp", minetest.pos_to_string(minp))
    
@@ -511,7 +520,7 @@ xmaps.load_map_item = function(itemstack)
 			)
 		end
 	else
-		-- no texture file → could be a world download
+		-- no texture file -> could be a world download
 		-- so we look for missing texture in item meta
 		-- and write that to the map texture file here
 		if texture_item_meta_exists then
@@ -843,10 +852,16 @@ minetest.register_entity(
 				}
 			)
 		end,
-		on_punch = function(self)
-			-- TODO: implement protection
+		on_punch = function(self, puncher)
+		   -- Protection implemented.
 		   local pos = self.object:get_pos()
+		   if protector then
+		      if minetest.is_protected (pos, puncher) then
+			 return
+		      end
+		   end
 		   local itemstring = self._itemstring
+		   
 		   if pos and itemstring then
 		      minetest.add_item(
 			 pos,
@@ -865,7 +880,7 @@ minetest.register_craftitem(
 		inventory_image = "xmaps_map.tga",
 		groups = { not_in_creative_inventory = 1 },
 		on_place = function(itemstack, player, pointed_thing)
-			if "node" ~= pointed_thing.type then
+			if pointed_thing.type ~= "node" then
 				return
 			end
 
@@ -875,7 +890,10 @@ minetest.register_craftitem(
 			end
 
 			local node_pos = pointed_thing.under
-
+			if protector and minetest.is_protected (pointed_thing.above, player)
+			then
+			   return
+			end
 			local direction = vector.normalize(
 				vector.subtract(
 					node_pos,
@@ -928,6 +946,10 @@ if minetest.registered_items["map:mapping_kit"] then
 		{
 			on_place = function(itemstack, player, pointed_thing)
 			   local pos = pointed_thing.under
+			   if protector and minetest.is_protected (pointed_thing.above, player)
+			   then
+			      return
+			   end
 				if pos then
 					local map = xmaps.create_map_item(
 						pos,
@@ -939,6 +961,7 @@ if minetest.registered_items["map:mapping_kit"] then
 			on_secondary_use = function(itemstack, player, pointed_thing)
 				local pos = player:get_pos()
 				if pos then
+
 				   local map = xmaps.create_map_item(pos)
 				   return map
 				end