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WindowServer: Cache the last two backing stores to make flipping faster.

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Instead of reattaching to the shared buffer on every flip, keep a reference
to the last seen backing store GraphicsBitmap. This way we can simply
swap the two last buffers when a flip happens.

This does increase memory consumption in apps that disable double-buffering
but I'll address that issue separately.
This commit is contained in:
Andreas Kling
2019-03-18 20:52:23 +01:00
parent 214b67defd
commit 794c81626e
2 changed files with 24 additions and 9 deletions
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20
WindowServer/WSClientConnection.cpp
View File

@@ -445,14 +445,18 @@ void WSClientConnection::handle_request(WSAPISetWindowBackingStoreRequest& reque
return;
}
auto& window = *(*it).value;
auto shared_buffer = SharedBuffer::create_from_shared_buffer_id(request.shared_buffer_id());
if (!shared_buffer)
return;
auto backing_store = GraphicsBitmap::create_with_shared_buffer(
request.has_alpha_channel() ? GraphicsBitmap::Format::RGBA32 : GraphicsBitmap::Format::RGB32,
*shared_buffer,
request.size());
window.set_backing_store(move(backing_store));
if (window.last_backing_store() && window.last_backing_store()->shared_buffer_id() == request.shared_buffer_id()) {
window.swap_backing_stores();
} else {
auto shared_buffer = SharedBuffer::create_from_shared_buffer_id(request.shared_buffer_id());
if (!shared_buffer)
return;
auto backing_store = GraphicsBitmap::create_with_shared_buffer(
request.has_alpha_channel() ? GraphicsBitmap::Format::RGBA32 : GraphicsBitmap::Format::RGB32,
*shared_buffer,
request.size());
window.set_backing_store(move(backing_store));
}
if (request.flush_immediately())
window.invalidate();