Was intended as a simple code improvement, however it also seems to make WinMain, MxString::operator=, MxDSFile::Open 100% (all of which just needed registers to be switched around)
* 100% Match of MxDSFile
* ...almost, MxDSFile::Open is still not quite matching but all of the
other methods are 100% matching.
* Turns out that most of the virtual methods and some of the members are
actually on the MxDSSource base class, which I've pulled out as part
of this.
* In order to implement the methods I added the MXIOINFO class, which
seems to be a thin wrapper around the MMIOINFO windows structure. We
can tell this because MMIOINFO::~MMIOINFO was included in the DLL
exports, and calls down to a function which deconstructs something
looking exactly like MMIOINFO.
* Add mxdssource.cpp
* mattkc feedback
* some accuracy improvements
* Use FOURCC macro
* Tirival solve in mxioinfo.cpp
* Update mxdsfile.cpp
0xFFFFFFFF -> -1
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Co-authored-by: Christian Semmler <mail@csemmler.com>
