[pulseview.git] / logicdatasnapshot.h

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include "datasnapshot.h"

#include <utility>
#include <vector>

namespace LogicDataSnapshotTest {
	class Pow2;
	class Basic;
	class LargeData;
	class Pulses;
}

class LogicDataSnapshot : public DataSnapshot
{
private:
	struct MipMapLevel
	{
		uint64_t length;
		uint64_t data_length;
		void *data;
	};

private:
	static const int ScaleStepCount = 10;
	static const int MipMapScalePower;
	static const int MipMapScaleFactor;
	static const float LogMipMapScaleFactor;
	static const uint64_t MipMapDataUnit;

public:
	typedef std::pair<int64_t, bool> EdgePair;

public:
	LogicDataSnapshot(const sr_datafeed_logic &logic);

	virtual ~LogicDataSnapshot();

	void append_payload(const sr_datafeed_logic &logic);

private:
	void reallocate_mip_map(MipMapLevel &m);

	void append_payload_to_mipmap();

public:
	uint64_t get_sample(uint64_t index) const;

	/**
	 * Parses a logic data snapshot to generate a list of transitions
	 * in a time interval to a given level of detail.
	 * @param[out] edges The vector to place the edges into.
	 * @param[in] start The start sample index.
	 * @param[in] end The end sample index.
	 * @param[in] min_length The minimum number of samples that
	 * can be resolved at this level of detail.
	 * @param[in] sig_index The index of the signal.
	 **/
	void get_subsampled_edges(std::vector<EdgePair> &edges,
		int64_t start, int64_t end,
		float min_length, int sig_index);

private:
	uint64_t get_subsample(int level, uint64_t offset) const;

	static int64_t pow2_ceil(int64_t x, unsigned int power);

private:
	struct MipMapLevel _mip_map[ScaleStepCount];
	uint64_t _last_append_sample;

	friend class LogicDataSnapshotTest::Pow2;
	friend class LogicDataSnapshotTest::Basic;
	friend class LogicDataSnapshotTest::LargeData;
	friend class LogicDataSnapshotTest::Pulses;
};
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include "datasnapshot.h"
	22
	23	#include <utility>
	24	#include <vector>
	25
	26	namespace LogicDataSnapshotTest {
	27	class Pow2;
	28	class Basic;
	29	class LargeData;
	30	class Pulses;
	31	}
	32
	33	class LogicDataSnapshot : public DataSnapshot
	34	{
	35	private:
	36	struct MipMapLevel
	37	{
	38	uint64_t length;
	39	uint64_t data_length;
	40	void *data;
	41	};
	42
	43	private:
	44	static const int ScaleStepCount = 10;
	45	static const int MipMapScalePower;
	46	static const int MipMapScaleFactor;
	47	static const float LogMipMapScaleFactor;
	48	static const uint64_t MipMapDataUnit;
	49
	50	public:
	51	typedef std::pair<int64_t, bool> EdgePair;
	52
	53	public:
	54	LogicDataSnapshot(const sr_datafeed_logic &logic);
	55
	56	virtual ~LogicDataSnapshot();
	57
	58	void append_payload(const sr_datafeed_logic &logic);
	59
	60	private:
	61	void reallocate_mip_map(MipMapLevel &m);
	62
	63	void append_payload_to_mipmap();
	64
	65	public:
	66	uint64_t get_sample(uint64_t index) const;
	67
	68	/**
	69	* Parses a logic data snapshot to generate a list of transitions
	70	* in a time interval to a given level of detail.
	71	* @param[out] edges The vector to place the edges into.
	72	* @param[in] start The start sample index.
	73	* @param[in] end The end sample index.
	74	* @param[in] min_length The minimum number of samples that
	75	* can be resolved at this level of detail.
	76	* @param[in] sig_index The index of the signal.
	77	**/
	78	void get_subsampled_edges(std::vector<EdgePair> &edges,
	79	int64_t start, int64_t end,
	80	float min_length, int sig_index);
	81
	82	private:
	83	uint64_t get_subsample(int level, uint64_t offset) const;
	84
	85	static int64_t pow2_ceil(int64_t x, unsigned int power);
	86
	87	private:
	88	struct MipMapLevel _mip_map[ScaleStepCount];
	89	uint64_t _last_append_sample;
	90
	91	friend class LogicDataSnapshotTest::Pow2;
	92	friend class LogicDataSnapshotTest::Basic;
	93	friend class LogicDataSnapshotTest::LargeData;
	94	friend class LogicDataSnapshotTest::Pulses;
	95	};