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  • Hash : ce64b4ad
    Author : David Ludwig
    Date : 2014-11-29T10:09:30

    WinRT: bug and data-integrity fixes for SDL_GetPrefPath()
    
    This change does a few things, all with regards to the WinRT implementation of
    SDL_GetPrefPath():
    
    1. it fixes a bug whereby SDL_GetPrefPath() did not create the directory it
    returned.  On other SDL platforms, SDL_GetPrefPath() will create separate
    directories for its 'org' and 'app' folders.  Without this, attempts to create
    files in the pref-path would fail, unless those directories were first created
    by the app, or by some other library the app used.  This change makes sure
    that these directories get created, before SDL_GetPrefPath() returns to its
    caller(s).
    
    
    2. it defaults to having SDL_GetPrefPath() return a WinRT 'Local' folder
    on all platforms.  Previously, for Windows Store apps, it would have used a
    different, 'Roaming' folder.  Files in Roaming folders can be automatically,
    and synchronized across multiple devices by Windows.  This synchronization can
    happen while the app runs, with new files being copied into a running app's
    pref-path.  Unless an app is specifically designed to handle this scenario,
    there is a chance that save-data could be overwritten in unwanted or
    unexpected ways.
    
    The default is now to use a Local folder, which does not get synchronized, and
    which is arguably a bit safer to use.  Apps that wish to use Roaming folders
    can do so by setting SDL_HINT_WINRT_PREF_PATH_ROOT to "roaming", however it
    is recommended that one first read Microsoft's documentation for Roaming
    files, a link to which is provided in README-winrt.md.
    
    To preserve older pref-path selection behavior (found in SDL 2.0.3, as well as
    many pre-2.0.4 versions of SDL from hg.libsdl.org), which uses a Roaming path
    in Windows Store apps, and a Local path in Windows Phone, set
    SDL_HINT_WINRT_PREF_PATH_ROOT to "old".
    
    Please note that Roaming paths are not supported on Windows Phone 8.0, due to
    limitations in the OS itself.  Attempts to use this will fail.
    (Windows Phone 8.1 does not have this limitation, however.)
    
    
    3. It makes SDL_GetPrefPath(), when on Windows Phone 8.0, and when
    SDL_HINT_WINRT_PREF_PATH_ROOT is set to "roaming", return NULL, rather than
    silently defaulting to a Local path (then switching to a Roaming path if and
    when the user upgraded to Windows Phone 8.1).
    

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