Re: windowscodecs: Implement ComponentFactory_CreateBitmapFromMemory. Take 2.

[Vincent Povirk]

This looks good to me (and it's hard for me to stick to my preference
for IWICBitmapLock, given how little code is needed here to accomplish
the same thing).

The remaining todo is an unrelated bug that's my fault, and I'll
resend my patch for it if this one is accepted.