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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Badge.h>
#include <AK/Function.h>
#include <AK/HashMap.h>
#include <LibGUI/DisplayLink.h>
#include <LibGUI/WindowServerConnection.h>
namespace GUI {
class DisplayLinkCallback : public RefCounted<DisplayLinkCallback> {
public:
DisplayLinkCallback(i32 link_id, Function<void(i32)> callback)
: m_link_id(link_id)
, m_callback(move(callback))
{
}
void invoke()
{
m_callback(m_link_id);
}
private:
i32 m_link_id { 0 };
Function<void(i32)> m_callback;
};
static HashMap<i32, RefPtr<DisplayLinkCallback>>& callbacks()
{
static HashMap<i32, RefPtr<DisplayLinkCallback>>* map;
if (!map)
map = new HashMap<i32, RefPtr<DisplayLinkCallback>>;
return *map;
}
static i32 s_next_callback_id = 1;
i32 DisplayLink::register_callback(Function<void(i32)> callback)
{
if (callbacks().is_empty())
WindowServerConnection::the().post_message(Messages::WindowServer::EnableDisplayLink());
i32 callback_id = s_next_callback_id++;
callbacks().set(callback_id, adopt(*new DisplayLinkCallback(callback_id, move(callback))));
return callback_id;
}
bool DisplayLink::unregister_callback(i32 callback_id)
{
ASSERT(callbacks().contains(callback_id));
callbacks().remove(callback_id);
if (callbacks().is_empty())
WindowServerConnection::the().post_message(Messages::WindowServer::DisableDisplayLink());
return true;
}
void DisplayLink::notify(Badge<WindowServerConnection>)
{
auto copy_of_callbacks = callbacks();
for (auto& it : copy_of_callbacks)
it.value->invoke();
}
}
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