An attempt at getting image data back

spider-cam/libcamera/include/libcamera/internal/request.h

@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * Request class private data
+ */
+
+#pragma once
+
+#include <chrono>
+#include <map>
+#include <memory>
+
+#include <libcamera/base/event_notifier.h>
+#include <libcamera/base/timer.h>
+
+#include <libcamera/request.h>
+
+using namespace std::chrono_literals;
+
+namespace libcamera {
+
+class Camera;
+class FrameBuffer;
+
+class Request::Private : public Extensible::Private
+{
+	LIBCAMERA_DECLARE_PUBLIC(Request)
+
+public:
+	Private(Camera *camera);
+	~Private();
+
+	Camera *camera() const { return camera_; }
+	bool hasPendingBuffers() const;
+
+	bool completeBuffer(FrameBuffer *buffer);
+	void complete();
+	void cancel();
+	void reset();
+
+	void prepare(std::chrono::milliseconds timeout = 0ms);
+	Signal<> prepared;
+
+private:
+	friend class PipelineHandler;
+	friend std::ostream &operator<<(std::ostream &out, const Request &r);
+
+	void doCancelRequest();
+	void emitPrepareCompleted();
+	void notifierActivated(FrameBuffer *buffer);
+	void timeout();
+
+	Camera *camera_;
+	bool cancelled_;
+	uint32_t sequence_ = 0;
+	bool prepared_ = false;
+
+	std::unordered_set<FrameBuffer *> pending_;
+	std::map<FrameBuffer *, std::unique_ptr<EventNotifier>> notifiers_;
+	std::unique_ptr<Timer> timer_;
+};
+
+} /* namespace libcamera */