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/*
* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "Filters/Filter.h"
#include <AK/Function.h>
#include <AK/NonnullRefPtr.h>
#include <AK/RefCounted.h>
#include <AK/Singleton.h>
#include <LibCore/SharedCircularQueue.h>
#include <LibThreading/ConditionVariable.h>
#include <LibThreading/Thread.h>
namespace PixelPaint {
class ImageProcessingCommand : public RefCounted<ImageProcessingCommand> {
public:
virtual void execute() = 0;
virtual ~ImageProcessingCommand() = default;
};
// A command applying a filter from a source to a target bitmap.
class FilterApplicationCommand : public ImageProcessingCommand {
public:
FilterApplicationCommand(NonnullRefPtr<Filter>, NonnullRefPtr<Layer>);
virtual void execute() override;
virtual ~FilterApplicationCommand() = default;
private:
NonnullRefPtr<Filter> m_filter;
NonnullRefPtr<Layer> m_target_layer;
};
// A command based on a custom user function.
class FunctionCommand : public ImageProcessingCommand {
public:
FunctionCommand(Function<void()> function)
: m_function(move(function))
{
}
virtual void execute() override { m_function(); }
private:
Function<void()> m_function;
};
// A utility class that allows various PixelPaint systems to execute image processing commands asynchronously on another thread.
class ImageProcessor final {
friend struct AK::SingletonInstanceCreator<ImageProcessor>;
public:
static ImageProcessor* the();
ErrorOr<void> enqueue_command(NonnullRefPtr<ImageProcessingCommand> command);
private:
ImageProcessor();
// Only the memory in the queue is in shared memory, i.e. the smart pointers themselves.
// The actual data will remain in normal memory, but for this application we're not using multiple processes so it's fine.
using Queue = Core::SharedSingleProducerCircularQueue<RefPtr<ImageProcessingCommand>>;
Queue m_command_queue;
NonnullRefPtr<Threading::Thread> m_processor_thread;
Threading::Mutex m_wakeup_mutex {};
Threading::ConditionVariable m_wakeup_variable;
};
}
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