Raw layer draw method.
This function is meant to be overridden.
UIElement are drawn on the Raw layer by increasing
z-order, or lexical order if lack thereof.
The widgets who have non-overlapping positions are
drawn in parallel if their flags allow it.
One MUST NOT draw outsides the given dirtyRects.
This allows fast and fine-grained updates.
A UIElement that doesn't respect dirtyRects WILL
have bad rendering with surrounding updates.
Raw layer draw method. This function is meant to be overridden.
UIElement are drawn on the Raw layer by increasing z-order, or lexical order if lack thereof.
The widgets who have non-overlapping positions are drawn in parallel if their flags allow it.
One MUST NOT draw outsides the given dirtyRects. This allows fast and fine-grained updates. A UIElement that doesn't respect dirtyRects WILL have bad rendering with surrounding updates.