9479bc8d7f
We are moving toward an architecture where the browser owns a single
process that holds the GPU context, so Skia resources can be shared
across every renderer and WebContent processes can be sandboxed away
from direct GPU access. A dedicated Compositor helper process is the
first step. The earlier commits laid the foundation; this one turns the
helper on as a selectable backend, gated behind
--enable-compositor-process so the existing in-process path stays the
shipping default.
Default topology -- one compositor per WebContent, in-process:
+---------+
| Browser |
+---------+
/ | \
v v v
+---+ +---+ +---+ each WebContent runs its own
|WC | |WC | |WC | CompositorThread on a dedicated
|+C+| |+C+| |+C+| thread, with its own GPU context.
+---+ +---+ +---+
Opt-in topology -- one single-threaded Compositor, shared by all WCs:
+---------+ control +-------------------+
| Browser |<----------->| Compositor |
+---------+ | (single thread, |
/ | \ | single GPU ctx, |
v v v data | shared by all |
[WC] [WC] [WC] ---------->| connected WCs) |
+-------------------+
Three IPC channels carry the work in the opt-in topology. The
existing Browser<->WebContent channel gains context allocation.
A new Browser<->Compositor channel carries context lifetime,
viewport, UI input, and presentation acks plus backing-store and
frame upcalls. A new WebContent<->Compositor channel carries
display lists, scroll state, video, compositor surfaces, async
scrolling, presentation, and screenshots, with upcalls for
delegated input and compositor loss.
22 lines
1.2 KiB
Text
22 lines
1.2 KiB
Text
#include <AK/Optional.h>
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#include <LibGfx/Point.h>
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#include <LibGfx/Size.h>
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#include <LibIPC/TransportHandle.h>
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#include <LibWeb/Compositor/Types.h>
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#include <LibWeb/Page/InputEvent.h>
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endpoint CompositorControlServer
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{
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init_transport(int peer_pid) => (int peer_pid)
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connect_web_content() => (IPC::TransportHandle handle, i32 web_content_connection_id)
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create_context(Web::Compositor::CompositorContextId context_id, Optional<u64> page_id, Web::Compositor::PagePresentationRegistration page_presentation_registration, i32 web_content_connection_id) => ()
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viewport_size_updated(Web::Compositor::CompositorContextId context_id, Gfx::IntSize viewport_size, bool is_top_level_traversable, Web::Compositor::WindowResizingInProgress window_resize_in_progress) =|
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handle_mouse_event(Web::Compositor::CompositorContextId context_id, Web::MouseEvent event) => (bool handled)
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dispatch_mouse_event_to_web_content(Web::Compositor::CompositorContextId context_id, Web::MouseEvent event) =|
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async_scroll_by(Web::Compositor::CompositorContextId context_id, Gfx::FloatPoint position, Gfx::FloatPoint delta_in_device_pixels) => (bool handled)
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presented_bitmap_ready_to_paint(Web::Compositor::CompositorContextId context_id, i32 bitmap_id) =|
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}
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