PNG bitmap loading, unloading and saving
The following functions provide support for loading and unloading SciTech
MGL bitmap resources in the PNG format. The SciTech MGL can load and
save all styles of PNG format bitmaps, including RGB, 8-bit grayscale
and 8-bit color bitmaps with an alpha channel. The PNG bitmap format is
the only format that the SciTech MGL supports that can load and handle
alpha channel data. The bitmap data will be converted to the format of
the destination device context if the bitmap is loaded into a device
context that is of a different pixel format to the incoming bitmap.
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