Double buffering support
The following functions provide support for hardware double buffering on
display devices that have two display buffers. Hardware double
buffering is used to achieve flicker free animation, but drawing to a
hidden portion of display memory and then instantly updating the screen
by changing the visible display page to the previously hidden display
page. You can also use the MGL_setDisplayStart function
to scroll around within a hardware scrolling or panning device context.
For combining hardware scrolling and double buffering, you can use MGL_setDisplayStart and
MGL_setVisualPage together.
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