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LibGUI+WindowServer: Use anonymous files for window backing stores :^)

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This patch replaces the use of shbufs for GUI::Window backing stores
with the new anonymous files mechanism.

Backing bitmaps are now built on memory allocated with anon_create().
They are passed across the IPC socket as IPC::File. This means that
WindowServer now pledges "recvfd" and graphical clients need to pledge
"sendfd" to work.

To support the cached bitmap swapping optimization on the WindowServer
side, each backing store is assigned an incrementing serial number on
the client side. (This allows us to re-use an already mapped file.)
This commit is contained in:
Andreas Kling 2021-01-15 12:11:22 +01:00
parent 4d97b955e6
commit 0b0514d46b
5 changed files with 42 additions and 19 deletions
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9
Userland/Services/WindowServer/Window.h
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@ -190,18 +190,23 @@ public:
const Gfx::Bitmap* backing_store() const { return m_backing_store.ptr(); }
Gfx::Bitmap* backing_store() { return m_backing_store.ptr(); }
void set_backing_store(RefPtr<Gfx::Bitmap>&& backing_store)
void set_backing_store(RefPtr<Gfx::Bitmap> backing_store, i32 serial)
{
m_last_backing_store = move(m_backing_store);
m_backing_store = move(backing_store);
m_last_backing_store_serial = m_backing_store_serial;
m_backing_store_serial = serial;
}
void swap_backing_stores()
{
swap(m_backing_store, m_last_backing_store);
swap(m_backing_store_serial, m_last_backing_store_serial);
}
Gfx::Bitmap* last_backing_store() { return m_last_backing_store.ptr(); }
i32 last_backing_store_serial() const { return m_last_backing_store_serial; }
void set_global_cursor_tracking_enabled(bool);
void set_automatic_cursor_tracking_enabled(bool enabled) { m_automatic_cursor_tracking_enabled = enabled; }
@ -340,6 +345,8 @@ private:
bool m_occluded { false };
RefPtr<Gfx::Bitmap> m_backing_store;
RefPtr<Gfx::Bitmap> m_last_backing_store;
i32 m_backing_store_serial { -1 };
i32 m_last_backing_store_serial { -1 };
int m_window_id { -1 };
i32 m_client_id { -1 };
float m_opacity { 1 };