This class support machine independent represenation of colors.
Your application will run unchanged independent of the type of display (b&w,
greyscale or color) and resolution (4bit, 8bit etc).
On systems with lower color resolution, colors are automatically represented
as dithered patterns to approximate the desired look.
All resource management is done automatically - colors are freed in the display
when no longer needed (you dont have to manually keep track of which colors are
still in use).
In most places, patterns can be used instead of pure colors for drawing.
This class represents cursors; both a number of standard cursors (such as hourglass, arrow, textCursor etc) and user defined cursors are supported.
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