Jelle Raaijmakers 634d1e0197 LibGUI+WindowServer: Improve window resizing performance ...

The old `GUI::Window` resizing behavior created a new backing store for
each resize event (i.e. every visible window size). This caused a lot of
trashing and on my machine, caused up to 25% of CPU time spent in
creating new backing stores.

The new behavior is a bit more sensible:

  * If the window size is shrinking, the backing store is already large
    enough to contain the entire window - so we don't create a new one.

  * If the window size is growing, as soon as the backing store can no
    longer contain the window, it is inflated with a large margin (of an
    arbitrary chosen 64 pixels) in both directions to accommodate some
    leeway in resizing before an even larger backing store is required.

  * When the user stops resizing the window, the backing store is
    resized to the exact dimensions of the window.

For me, this brings the CPU time for creating backing stores down to 0%.

2023-01-17 18:16:02 +01:00

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