2021-08-23 20:22:34 (UTC-03:00)

Marcel Rodrigues <marcelgmr@gmail.com>

map: use better sentinel for end-of-poly in cache

(0, 0) might occur as an actual origin for a poly
use the largest negative coordinates instead

diff --git a/map.lua b/map.lua
index c801955..8239921 100644
--- a/map.lua
+++ b/map.lua
@@ -260,7 +260,7 @@ function Frame:save_cache(fname, sf, filter)
             end
             bio.write_beu32(cache, 0) -- end list of points
         end
-        bio.write_beu32(cache, 0) -- end list of polys
+        bio.write_beu32(cache, 0x80008000) -- end list of polys
     end
     cache:close()
 end
@@ -360,7 +360,7 @@ function Cache:get_polys(key)
     cache:seek("set", offset)
     return function()
         local ox, oy = bio.read_bei16(cache), bio.read_bei16(cache)
-        if ox ~= 0 or oy ~= 0 then
+        if ox ~= -0x8000 or oy ~= -0x8000 then
             local x, y = 0, 0
             return function()
                 if x ~= ox or y ~= oy then