Add SCRATCHCPPRENDER_EXPORT macro

Author: adazem009

include/scratchcpp-render/scratchcpp-render.h

@@ -2,6 +2,20 @@
 
 #pragma once
 
+#if defined(_MSC_VER) || defined(WIN64) || defined(_WIN64) || defined(__WIN64__) || defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__)
+#define DECL_EXPORT __declspec(dllexport)
+#define DECL_IMPORT __declspec(dllimport)
+#else
+#define DECL_EXPORT __attribute__((visibility("default")))
+#define DECL_IMPORT __attribute__((visibility("default")))
+#endif
+
+#if defined(SCRATCHCPPRENDER_LIBRARY)
+#define SCRATCHCPPRENDER_EXPORT DECL_EXPORT
+#else
+#define SCRATCHCPPRENDER_EXPORT DECL_IMPORT
+#endif
+
 #include <string>
 
 /*! \brief The main namespace of the library. */