improve opencv again (#455)

packages/o/opencv/xmake.lua

@@ -55,6 +55,7 @@ package("opencv")
     end
     add_configs("blas", {description = "Set BLAS vendor.", default = nil, type = "string", values = {"mkl", "openblas"}})
     add_configs("cuda", {description = "Enable CUDA support.", default = false, type = "boolean"})
+    add_configs("dynamic_parallel", {description = "Dynamically load parallel runtime (TBB etc.).", default = false, type = "boolean"})
 
     if is_plat("macosx") then
         add_frameworks("Foundation", "CoreFoundation", "CoreGraphics", "AppKit", "OpenCL")
@@ -109,6 +110,8 @@ package("opencv")
         if package:config("cuda") then
             table.insert(configs, "-DWITH_CUDA=ON")
         end
+        table.insert(configs, "-DPARALLEL_ENABLE_PLUGINS=" .. (package:config("dynamic_parallel") and "ON" or "OFF"))
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
         table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
         if package:is_plat("windows") then
             table.insert(configs, "-DBUILD_WITH_STATIC_CRT=" .. (package:config("vs_runtime"):startswith("MT") and "ON" or "OFF"))