Integer Coordinates
Integer coordinates are passed as 32-bit signed integers to the
accelerated rendering functions. For the most part the hardware drawing
functions perform any kind of clipping, so it is up to the application
to ensure that all coordinates passed to the accelerated rendering
functions are within the range of the currently active drawing buffer.
The exception to this rule is the ClipMonoImage, StretchBlt and clipped
line drawing family of functions.
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