implement selection mask with lasso tool

android/CMakeLists.txt

@@ -26,6 +26,11 @@ add_library(
 	../libs/tinyxml2/tinyxml2.cpp
 	../libs/jpeg/jpgd.cpp
 	../libs/jpeg/jpge.cpp
+	../libs/poly2tri/poly2tri/common/shapes.cc
+	../libs/poly2tri/poly2tri/sweep/advancing_front.cc
+	../libs/poly2tri/poly2tri/sweep/cdt.cc
+	../libs/poly2tri/poly2tri/sweep/sweep_context.cc
+	../libs/poly2tri/poly2tri/sweep/sweep.cc
 	src/main/cpp/main.cpp
 	../engine/pch.cpp
 	../engine/util.cpp
@@ -84,6 +89,7 @@ target_include_directories(native-lib PRIVATE
 	../libs/stb
 	../libs/jpeg
 	../libs/curl-android-ios/prebuilt-with-ssl/android/include
+	../libs/poly2tri/poly2tri
 )
 
 # add lib dependencies