Std.Ui.Canvas.repaint

fn

This is a callable function.

What it does

A surface with regions brought up to date with the display list.

Only the regions are rasterized; every other pixel is carried from the

earlier surface. When the regions cover every pixel whose color differs

between the display list the earlier surface was rendered from and this

one, the result is exactly what render gives.

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• Result makes success and recoverable failure part of the function's type.