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https://github.com/LadybirdBrowser/ladybird
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ad2ee4fe7a
Previously, iframes were rasterized synchronously as nested display lists inside their parent's display list: the parent's paint walk called record_display_list() on each hosted iframe document and emitted a PaintNestedDisplayList command that the player would recurse into. Only the top-level traversable's RenderingThread was ever active, even though every Navigable already owned one. The motivation for splitting this apart: - Work in the outer document no longer has to be re-recorded when only an iframe changes. The parent's cached display list now references the iframe's rasterized output live via an ExternalContentSource, so an iframe invalidation just needs the parent's display list replayed, not re-recorded. - Each iframe now has a self-contained rasterization pipeline, which is prep work for moving iframes into separate sandboxed processes.