WinRT: made WinRT path retrieval be available in both UCS-2 and UTF-8 flavors

include/SDL_system.h

@@ -135,7 +135,25 @@ typedef enum
  *      SDL_WinRT_Path for more information on which path types are
  *      supported where.
  */
-extern DECLSPEC const wchar_t * SDLCALL SDL_WinRTGetFileSystemPath(SDL_WinRT_Path pathType);
+extern DECLSPEC const wchar_t * SDLCALL SDL_WinRTGetFSPathUNICODE(SDL_WinRT_Path pathType);
+
+/**
+ *  \brief Retrieves a Windows RT defined path on the local file system
+ *
+ *  \note Documentation on most app-specific path types on Windows RT
+ *      can be found on MSDN, at the URL:
+ *      http://msdn.microsoft.com/en-us/library/windows/apps/hh464917.aspx
+ *
+ *  \param pathType The type of path to retrieve.
+ *  \ret A UTF-8 string (8-bit, multi-byte) containing the path, or NULL
+ *      if the path is not available for any reason.  Not all paths are
+ *      available on all versions of Windows.  This is especially true on
+ *      Windows Phone.  Check the documentation for the given
+ *      SDL_WinRT_Path for more information on which path types are
+ *      supported where.
+ */
+extern DECLSPEC const char * SDLCALL SDL_WinRTGetFSPathUTF8(SDL_WinRT_Path pathType);
+
 
 #endif /* __WINRT__ */
 

src/core/windowsrt/SDL_winrtpaths.cpp

@@ -14,12 +14,13 @@ extern "C" {
 }
 
 #include <string>
+#include <unordered_map>
 
 using namespace std;
 using namespace Windows::Storage;
 
 extern "C" const wchar_t *
-SDL_WinRTGetFileSystemPath(SDL_WinRT_Path pathType)
+SDL_WinRTGetFSPathUNICODE(SDL_WinRT_Path pathType)
 {
     switch (pathType) {
         case SDL_WINRT_PATH_INSTALLED_LOCATION:
@@ -68,4 +69,26 @@ SDL_WinRTGetFileSystemPath(SDL_WinRT_Path pathType)
     return NULL;
 }
 
+extern "C" const char *
+SDL_WinRTGetFSPathUTF8(SDL_WinRT_Path pathType)
+{
+    typedef unordered_map<SDL_WinRT_Path, string> UTF8PathMap;
+    static UTF8PathMap utf8Paths;
+
+    UTF8PathMap::iterator searchResult = utf8Paths.find(pathType);
+    if (searchResult != utf8Paths.end()) {
+        return searchResult->second.c_str();
+    }
+
+    const wchar_t * ucs2Path = SDL_WinRTGetFSPathUNICODE(pathType);
+    if (!ucs2Path) {
+        return NULL;
+    }
+
+    char * utf8Path = WIN_StringToUTF8(ucs2Path);
+    utf8Paths[pathType] = utf8Path;
+    SDL_free(utf8Path);
+    return utf8Paths[pathType].c_str();
+}
+
 #endif /* __WINRT__ */