Put the scaling function in a lib

CMakeLists.txt

@@ -28,6 +28,7 @@ project(pacman)
 
 set(CMAKE_CXX_STANDARD 20)
 
+add_subdirectory(scaling-lib)
 add_subdirectory(lib)
 add_subdirectory(src)
 add_subdirectory(test)

lib/CMakeLists.txt

@@ -10,14 +10,8 @@ file(GLOB_RECURSE sources CONFIGURE_DEPENDS "*.cpp")
 add_library(libpacman ${sources})
 
 target_include_directories(libpacman PUBLIC include)
-target_link_libraries(libpacman PUBLIC fmt::fmt sfml-graphics)
+target_link_libraries(libpacman PUBLIC scaling-lib fmt::fmt sfml-graphics)
 
 if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
     target_link_libraries(libpacman PUBLIC OpenGL::OpenGL OpenGL::GLX)
-endif ()
+endif ()
-
-if (${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
-    target_sources(libpacman PRIVATE Scaling.mm)
-else()
-    target_sources(libpacman PRIVATE Scaling.cpp)
-endif ()

lib/Canvas.cpp

@@ -1,11 +1,10 @@
 #include "Canvas.hpp"
 #include "Game.hpp"
+#include "Scaling.hpp"
 #include <fmt/format.h>
 #include <string>
 #include <vector>
 
-double scaling_factor_for_window(sf::WindowHandle);
-
 namespace pacman {
 
 Canvas::Canvas()

scaling-lib/CMakeLists.txt

@@ -0,0 +1,12 @@
+find_package(SFML COMPONENTS COMPONENTS window graphics CONFIG REQUIRED)
+
+add_library(scaling-lib ${sources})
+
+target_include_directories(scaling-lib PUBLIC .)
+target_link_libraries(scaling-lib PUBLIC sfml-graphics)
+
+if (${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
+    target_sources(scaling-lib PRIVATE Scaling.mm)
+else()
+    target_sources(scaling-lib PRIVATE Scaling.cpp)
+endif ()

scaling-lib/Scaling.cpp

@@ -1,5 +1,10 @@
-#include <SFML/Graphics.hpp>
+#include "Scaling.hpp"
+
+namespace pacman {
 
 double scaling_factor_for_window(sf::WindowHandle) {
     return 1.0;
 }
+
+
+}

scaling-lib/Scaling.hpp

@@ -0,0 +1,6 @@
+#pragma once
+#include <SFML/Graphics.hpp>
+
+namespace pacman {
+    double scaling_factor_for_window(sf::WindowHandle);
+}

scaling-lib/Scaling.mm

@@ -5,10 +5,15 @@ It is not a C++ file and is not part of this course!
 */
 #import "AppKit/NSWindow.h"
 #include <cassert>
+#include "Scaling.hpp"
 
-double scaling_factor_for_window(void* ptr) {
+namespace pacman {
+
+double scaling_factor_for_window(sf::WindowHandle) {
     NSWindow* window = static_cast<NSWindow*>(ptr);
     assert(window);
     double d = [window backingScaleFactor];
     return d;
+}
+
 }