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https://github.com/SerenityOS/serenity
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424a3f5ac3
This patch adds GUI::DisplayLink, a mechanism for registering callbacks that will fire at the display refresh rate. Note that we don't actually know the screen refresh rate, but this is instead completely driven by WindowServer's compositing timer. For all current intents and purposes it does the job well enough. :^)
93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Badge.h>
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <LibGUI/DisplayLink.h>
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#include <LibGUI/WindowServerConnection.h>
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namespace GUI {
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class DisplayLinkCallback : public RefCounted<DisplayLinkCallback> {
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public:
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DisplayLinkCallback(i32 link_id, Function<void(i32)> callback)
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: m_link_id(link_id)
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, m_callback(move(callback))
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{
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}
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void invoke()
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{
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m_callback(m_link_id);
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}
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private:
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i32 m_link_id { 0 };
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Function<void(i32)> m_callback;
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};
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static HashMap<i32, RefPtr<DisplayLinkCallback>>& callbacks()
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{
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static HashMap<i32, RefPtr<DisplayLinkCallback>>* map;
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if (!map)
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map = new HashMap<i32, RefPtr<DisplayLinkCallback>>;
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return *map;
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}
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static i32 s_next_callback_id = 1;
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i32 DisplayLink::register_callback(Function<void(i32)> callback)
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{
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if (callbacks().is_empty())
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WindowServerConnection::the().post_message(Messages::WindowServer::EnableDisplayLink());
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i32 callback_id = s_next_callback_id++;
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callbacks().set(callback_id, adopt(*new DisplayLinkCallback(callback_id, move(callback))));
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return callback_id;
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}
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bool DisplayLink::unregister_callback(i32 callback_id)
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{
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ASSERT(callbacks().contains(callback_id));
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callbacks().remove(callback_id);
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if (callbacks().is_empty())
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WindowServerConnection::the().post_message(Messages::WindowServer::DisableDisplayLink());
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return true;
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}
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void DisplayLink::notify(Badge<WindowServerConnection>)
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{
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auto copy_of_callbacks = callbacks();
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for (auto& it : copy_of_callbacks)
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it.value->invoke();
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}
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}
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