BitBlt support
The following functions provide support for copying blocks of image data
between device contexts, or between areas of the same device context.
The data can be copied using a simple solid copy, with arbitrary
stretching and shrinking of the data to a different-sized destination
rectangle and with source transparency for drawing transparent sprites
for animation. The SciTech MGL also fully supports rasterizing of
monochrome bitmaps, which can be used for fast masking operations and
for rasterizing custom monochrome text.
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