logicsegment.hpp

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/*
 * This file is part of the PulseView 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
 */

#ifndef PULSEVIEW_PV_DATA_LOGICSEGMENT_HPP
#define PULSEVIEW_PV_DATA_LOGICSEGMENT_HPP

#include "segment.hpp"

#include <utility>
#include <vector>

namespace sigrok {
    class Logic;
}

namespace LogicSegmentTest {
struct Pow2;
struct Basic;
struct LargeData;
struct Pulses;
struct LongPulses;
}

namespace pv {
namespace data {

class LogicSegment : public Segment
{
private:
    struct MipMapLevel
    {
        uint64_t length;
        uint64_t data_length;
        void *data;
    };

private:
    static const unsigned 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:
    LogicSegment(std::shared_ptr<sigrok::Logic> logic,
        uint64_t samplerate, uint64_t expected_num_samples = 0);

    virtual ~LogicSegment();

    void append_payload(std::shared_ptr<sigrok::Logic> logic);

    void get_samples(uint8_t *const data,
        int64_t start_sample, int64_t end_sample) const;

private:
    uint64_t unpack_sample(const uint8_t *ptr) const;
    void pack_sample(uint8_t *ptr, uint64_t value);
    
    void reallocate_mipmap_level(MipMapLevel &m);

    void append_payload_to_mipmap();

    uint64_t get_sample(uint64_t index) const;

public:
    void get_subsampled_edges(std::vector<EdgePair> &edges,
        uint64_t start, uint64_t end,
        float min_length, int sig_index);

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

    static uint64_t pow2_ceil(uint64_t x, unsigned int power);

private:
    struct MipMapLevel mip_map_[ScaleStepCount];
    uint64_t last_append_sample_;

    friend struct LogicSegmentTest::Pow2;
    friend struct LogicSegmentTest::Basic;
    friend struct LogicSegmentTest::LargeData;
    friend struct LogicSegmentTest::Pulses;
    friend struct LogicSegmentTest::LongPulses;
};

} // namespace data
} // namespace pv

#endif // PULSEVIEW_PV_DATA_LOGICSEGMENT_HPP