WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/libnest2d/CMakeLists.txt

@@ -0,0 +1,135 @@
+cmake_minimum_required(VERSION 2.8)
+
+project(Libnest2D)
+
+if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
+    # Update if necessary
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-long-long ")
+endif()
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED)
+
+# Add our own cmake module path.
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake_modules/)
+
+option(LIBNEST2D_UNITTESTS "If enabled, googletest framework will be downloaded
+    and the provided unit tests will be included in the build." OFF)
+
+option(LIBNEST2D_BUILD_EXAMPLES "If enabled, examples will be built." OFF)
+
+set(LIBNEST2D_GEOMETRIES_BACKEND "clipper" CACHE STRING
+    "Build libnest2d with geometry classes implemented by the chosen backend.")
+
+set(LIBNEST2D_OPTIMIZER_BACKEND "nlopt" CACHE STRING
+    "Build libnest2d with optimization features implemented by the chosen backend.")
+
+set(LIBNEST2D_SRCFILES
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/libnest2d.hpp         # Templates only
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d.h                     # Exports ready made types using template arguments
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/geometry_traits.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/common.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/optimizer.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/metaloop.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/rotfinder.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/placers/placer_boilerplate.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/placers/bottomleftplacer.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/placers/nfpplacer.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/geometry_traits_nfp.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/selections/selection_boilerplate.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/selections/filler.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/selections/firstfit.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/selections/djd_heuristic.hpp
+    )
+
+set(LIBNEST2D_LIBRARIES "")
+
+set(LIBNEST2D_HEADERS ${CMAKE_CURRENT_SOURCE_DIR})
+
+if(LIBNEST2D_GEOMETRIES_BACKEND STREQUAL "clipper")
+
+    # Clipper backend is not enough on its own, it still needs some functions
+    # from Boost geometry
+    if(NOT Boost_INCLUDE_DIRS_FOUND)
+        find_package(Boost 1.58 REQUIRED)
+        # TODO automatic download of boost geometry headers
+    endif()
+
+    add_subdirectory(libnest2d/clipper_backend)
+
+    include_directories(BEFORE ${CLIPPER_INCLUDE_DIRS})
+    include_directories(${Boost_INCLUDE_DIRS})
+
+    list(APPEND LIBNEST2D_SRCFILES ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/clipper_backend/clipper_backend.hpp
+                                   ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/boost_alg.hpp)
+    list(APPEND LIBNEST2D_LIBRARIES ${CLIPPER_LIBRARIES})
+    list(APPEND LIBNEST2D_HEADERS ${CLIPPER_INCLUDE_DIRS}
+                                  ${Boost_INCLUDE_DIRS_FOUND})
+endif()
+
+if(LIBNEST2D_OPTIMIZER_BACKEND STREQUAL "nlopt")
+    find_package(NLopt 1.4)
+    if(NOT NLopt_FOUND)
+        message(STATUS  "NLopt not found so downloading "
+                        "and automatic build is performed...")
+        include(DownloadNLopt)
+    endif()
+    find_package(Threads REQUIRED)
+
+    list(APPEND LIBNEST2D_SRCFILES  ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/optimizers/simplex.hpp
+                                    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/optimizers/subplex.hpp
+                                    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/optimizers/genetic.hpp
+                                    ${CMAKE_CURRENT_SOURCE_DIR}/libnest2d/optimizers/nlopt_boilerplate.hpp)
+    list(APPEND LIBNEST2D_LIBRARIES ${NLopt_LIBS})
+    list(APPEND LIBNEST2D_HEADERS ${NLopt_INCLUDE_DIR})
+endif()
+
+if(LIBNEST2D_UNITTESTS)
+    enable_testing()
+    add_subdirectory(tests)
+endif()
+
+if(LIBNEST2D_BUILD_EXAMPLES)
+
+    add_executable(example examples/main.cpp
+#                           tools/libnfpglue.hpp
+#                           tools/libnfpglue.cpp
+                           tools/nfp_svgnest.hpp
+                           tools/nfp_svgnest_glue.hpp
+                           tools/svgtools.hpp
+                           tests/printer_parts.cpp
+                           tests/printer_parts.h
+                           ${LIBNEST2D_SRCFILES}
+                           )
+    set(TBB_STATIC ON)
+    find_package(TBB QUIET)
+    if(TBB_FOUND)
+        message(STATUS "Parallelization with Intel TBB")
+        target_include_directories(example PUBLIC ${TBB_INCLUDE_DIRS})
+        target_compile_definitions(example PUBLIC ${TBB_DEFINITIONS} -DUSE_TBB)
+        if(MSVC)
+           # Suppress implicit linking of the TBB libraries by the Visual Studio compiler.
+           target_compile_definitions(example PUBLIC -D__TBB_NO_IMPLICIT_LINKAGE)
+        endif()
+        # The Intel TBB library will use the std::exception_ptr feature of C++11.
+        target_compile_definitions(example PUBLIC -DTBB_USE_CAPTURED_EXCEPTION=1)
+
+        target_link_libraries(example ${TBB_LIBRARIES})
+   else()
+       find_package(OpenMP QUIET)
+       if(OpenMP_CXX_FOUND)
+           message(STATUS "Parallelization with OpenMP")
+           target_include_directories(example PUBLIC OpenMP::OpenMP_CXX)
+           target_link_libraries(example OpenMP::OpenMP_CXX)
+       endif()
+   endif()
+
+    target_link_libraries(example ${LIBNEST2D_LIBRARIES})
+    target_include_directories(example PUBLIC ${LIBNEST2D_HEADERS})
+endif()
+
+get_directory_property(hasParent PARENT_DIRECTORY)
+if(hasParent)
+    set(LIBNEST2D_INCLUDES ${LIBNEST2D_HEADERS} PARENT_SCOPE)
+    set(LIBNEST2D_LIBRARIES ${LIBNEST2D_LIBRARIES} PARENT_SCOPE)
+endif()