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WindowServer+Magnifier: Make Magnifier buttery smooth :^)

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This patch moves the magnifier rect computation over to the server side
to ensure that the mouse cursor position and the screen image never get
out of sync.
This commit is contained in:
Andreas Kling
2021-06-07 10:20:50 +02:00
parent 0ea1fd2d54
commit cb295ab644
5 changed files with 18 additions and 9 deletions
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14
Userland/Services/WindowServer/ClientConnection.cpp
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@@ -904,6 +904,20 @@ Messages::WindowServer::GetScreenBitmapResponse ClientConnection::get_screen_bit
return bitmap.to_shareable_bitmap();
}
Messages::WindowServer::GetScreenBitmapAroundCursorResponse ClientConnection::get_screen_bitmap_around_cursor(Gfx::IntSize const& size)
{
auto scale_factor = WindowManager::the().scale_factor();
auto cursor_location = Screen::the().cursor_location();
Gfx::Rect rect { (cursor_location.x() * scale_factor) - (size.width() / 2), (cursor_location.y() * scale_factor) - (size.height() / 2), size.width(), size.height() };
// Recompose the screen to make sure the cursor is painted in the location we think it is.
// FIXME: This is rather wasteful. We can probably think of a way to avoid this.
Compositor::the().compose();
auto bitmap = Compositor::the().front_bitmap_for_screenshot({}).cropped(rect);
return bitmap->to_shareable_bitmap();
}
Messages::WindowServer::IsWindowModifiedResponse ClientConnection::is_window_modified(i32 window_id)
{
auto it = m_windows.find(window_id);