Aliaksandr Kalenik a86f318a9b LibWeb: Move rendering backpressure from main thread to RenderingThread ...

In preparation for handling input events on the rendering thread, move
backpressure management to RenderingThread. The rendering thread needs
to manage this independently without querying the main thread.

Previously, the main thread would block when the UI process hadn't yet
released the backing surface. Now, the main thread can continue
producing display lists while the UI process is busy, allowing more work
to happen in parallel. When rasterization is slow and display lists are
produced faster than they can be consumed, presentation requests are
naturally coalesced using a flag-based approach -
multiple present_frame() calls simply update the pending state,
resulting in a single rasterization with the latest display list.

2026-01-26 19:05:34 +01:00

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