C++ PointBuffer::getCapacity方法代码示例

boost::uint32_t Crop::readBufferImpl(PointBuffer& dstData)
{
    // The client has asked us for dstData.getCapacity() points.
    // We will read from our previous stage until we get that amount (or
    // until the previous stage runs out of points).

    boost::uint32_t numPointsNeeded = dstData.getCapacity();
    assert(dstData.getNumPoints() == 0);

    while (numPointsNeeded > 0)
    {
        if (getPrevIterator().atEnd()) break;

        // set up buffer to be filled by prev stage
        PointBuffer srcData(dstData.getSchema(), numPointsNeeded);

        // read from prev stage
        const boost::uint32_t numSrcPointsRead = getPrevIterator().read(srcData);
        assert(numSrcPointsRead == srcData.getNumPoints());
        assert(numSrcPointsRead <= numPointsNeeded);

        // we got no data, and there is no more to get -- exit the loop
        if (numSrcPointsRead == 0) break;

        // copy points from src (prev stage) into dst (our stage), 
        // based on the CropFilter's rules (i.e. its bounds)
        const boost::uint32_t numPointsProcessed = m_cropFilter.processBuffer(dstData, srcData);

        numPointsNeeded -= numPointsProcessed;
    }

    const boost::uint32_t numPointsAchieved = dstData.getNumPoints();

    return numPointsAchieved;
}

boost::uint32_t Reader::processBuffer(PointBuffer& data, boost::uint64_t index) const
{
    const Schema& schema = data.getSchema();

    // how many are they asking for?
    boost::uint64_t numPointsWanted = data.getCapacity();

    // we can only give them as many as we have left
    boost::uint64_t numPointsAvailable = getNumPoints() - index;
    if (numPointsAvailable < numPointsWanted)
        numPointsWanted = numPointsAvailable;

    schema::DimensionMap* d = m_buffer.getSchema().mapDimensions(data.getSchema());

    data.setNumPoints(0);

    PointBuffer::copyLikeDimensions(m_buffer, data,
                                    *d,
                                    index,
                                    0,
                                    numPointsWanted);

    data.setNumPoints(numPointsWanted);
    delete d;
    return numPointsWanted;
}

boost::uint32_t DecimationFilterSequentialIterator::readBufferImpl(PointBuffer& dstData)
{
    // The client has asked us for dstData.getCapacity() points.
    // We will read from our previous stage until we get that amount (or
    // until the previous stage runs out of points).

    boost::uint32_t numPointsNeeded = dstData.getCapacity();
    assert(dstData.getNumPoints() == 0);

    // set up buffer to be filled by prev stage
    PointBuffer srcData(dstData.getSchemaLayout(), numPointsNeeded);

    while (numPointsNeeded > 0)
    {
        // read from prev stage
        const boost::uint64_t srcStartIndex = getPrevIterator().getIndex();
        const boost::uint32_t numSrcPointsRead = getPrevIterator().read(srcData);
        assert(numSrcPointsRead <= srcData.getNumPoints());
        //assert(numSrcPointsRead <= numPointsNeeded);

        // we got no data, and there is no more to get -- exit the loop
        if (numSrcPointsRead == 0) break;

        // copy points from src (prev stage) into dst (our stage), 
        // based on the CropFilter's rules (i.e. its bounds)
        const boost::uint32_t numPointsAdded = m_filter.processBuffer(dstData, srcData, srcStartIndex);

        numPointsNeeded -= numPointsAdded;
        //printf(".");fflush(stdout);
    }

    const boost::uint32_t numPointsAchieved = dstData.getNumPoints();
    return numPointsAchieved;
}

boost::uint32_t Mosaic::readBufferImpl(PointBuffer& destData)
{
    boost::uint32_t totalNumPointsToRead = destData.getCapacity();
    boost::uint32_t totalNumPointsRead = 0;
    boost::uint32_t destPointIndex = 0;

    // for each stage, we read as many points as we can
    while (totalNumPointsRead < totalNumPointsToRead)
    {
        assert(m_iteratorIndex < m_prevIterators.size());
        m_prevIterator = m_prevIterators[m_iteratorIndex];

        // read as much as we can into temp buffer
        PointBuffer tmp(destData.getSchema(), totalNumPointsToRead-totalNumPointsRead);
        boost::uint32_t numRead = m_prevIterator->read(tmp);
        totalNumPointsRead += numRead;

        // concat the temp buffer on to end of real dest buffer
        destData.copyPointsFast(destPointIndex, 0, tmp, numRead);
        destPointIndex += numRead;
        destData.setNumPoints(destData.getNumPoints() + numRead);

        if (m_prevIterator->atEnd())
        {
            ++m_iteratorIndex;
        }
        if (m_iteratorIndex == m_prevIterators.size())
        {
            break;
        }
    }

    return totalNumPointsRead;
}

// BUG: this duplicates the code above
boost::uint32_t Cache::readBufferImpl(PointBuffer& data)
{
    const boost::uint32_t cacheBlockSize = m_filter.getCacheBlockSize();

    const boost::uint64_t currentPointIndex = getIndex();

    // for now, we only read from the cache if they are asking for one point
    // (this avoids the problem of an N-point request needing more than one
    // cached block to satisfy it)
    if (data.getCapacity() != 1)
    {
        const boost::uint32_t numRead = getPrevIterator().read(data);

        // if they asked for a full block and we got a full block,
        // and the block we got is properly aligned and not already cached,
        // then let's cache it!
        const bool isCacheable = (data.getCapacity() == cacheBlockSize) &&
                                 (numRead == cacheBlockSize) &&
                                 (currentPointIndex % cacheBlockSize == 0);
        if (isCacheable && (m_filter.lookupInCache(currentPointIndex) == NULL))
        {
            m_filter.addToCache(currentPointIndex, data);
        }

        m_filter.updateStats(numRead, data.getCapacity());

        return numRead;
    }

    // they asked for just one point -- first, check Mister Cache
    const PointBuffer* block = m_filter.lookupInCache(currentPointIndex);
    if (block != NULL)
    {
        // A hit! A palpable hit!
        data.copyPointFast(0,  currentPointIndex % cacheBlockSize, *block);

        m_filter.updateStats(0, 1);

        return 1;
    }

    // Not in the cache, so do a normal read :-(
    const boost::uint32_t numRead = getPrevIterator().read(data);
    m_filter.updateStats(numRead, numRead);

    return numRead;
}

void Selector::alterSchema(PointBuffer& buffer)
{
    Schema const& original_schema = buffer.getSchema();

    Schema new_schema = buffer.getSchema();
    
    std::map<std::string, bool> const& ignoredMap = m_selectorFilter.getIgnoredMap();
    // for (std::map<std::string, bool>::const_iterator i = ignoredMap.begin();
    //     i != ignoredMap.end(); ++i)
    // {
    //     boost::optional<Dimension const&> d = original_schema.getDimensionOptional(i->first);
    //     if (d)
    //     {
    //         Dimension d2(*d);
    //         boost::uint32_t flags = d2.getFlags();
    //         if (i->second)
    //             d2.setFlags(flags | dimension::IsIgnored);
    //         new_schema.setDimension(d2);
    //     }
    // }
    // 

    schema::Map dimensions = original_schema.getDimensions();
    schema::index_by_index const& dims = dimensions.get<schema::index>();
    for (schema::index_by_index::const_iterator t = dims.begin(); 
         t != dims.end(); 
         ++t)
    {
        
        std::map<std::string, bool>::const_iterator ignored = ignoredMap.find(t->getName());
        if (ignored != ignoredMap.end())
        {
            if (ignored->second) // marked to be dropped
            {
                // set to ignored
                Dimension d2(*t);
                boost::uint32_t flags = d2.getFlags();
                d2.setFlags(flags | dimension::IsIgnored);
                new_schema.setDimension(d2);
            }
        }
        
        else { // didn't find it in our map of specified dimensions
            
            if (m_selectorFilter.doIgnoreUnspecifiedDimensions())
            {
                // set to ignored
                Dimension d2(*t);
                boost::uint32_t flags = d2.getFlags();
                d2.setFlags(flags | dimension::IsIgnored);
                new_schema.setDimension(d2);
            }
        }

    }

    buffer = PointBuffer(new_schema, buffer.getCapacity());
}

PointBuffer* makeTestBuffer()
{
    Dimension d1("Classification", dimension::UnsignedInteger, 1);
    Dimension d2("X", dimension::SignedInteger, 4);
    Dimension d3("Y", dimension::Float, 8);
    Schema schema;
    schema.appendDimension(d1);
    schema.appendDimension(d2);
    schema.appendDimension(d3);

    std::size_t offX = schema.getDimension(0).getByteOffset();
    BOOST_CHECK(offX==0);
    std::size_t offY = schema.getDimension(1).getByteOffset();
    BOOST_CHECK(offY==1);
    std::size_t offZ = schema.getDimension(2).getByteOffset();
    BOOST_CHECK(offZ==5);

    boost::uint32_t capacity = 17;
    PointBuffer* data = new PointBuffer(schema, capacity);

    BOOST_CHECK(data->getCapacity() == capacity);

    Dimension const& dimC = data->getSchema().getDimension("Classification");
    Dimension const& dimX = data->getSchema().getDimension("X");
    Dimension const& dimY = data->getSchema().getDimension("Y");

    // write the data into the buffer
    for (boost::uint32_t i=0; i<data->getCapacity(); i++)
    {
        const boost::uint8_t x = static_cast<boost::uint8_t>(i)+1;
        const boost::int32_t y = i*10;
        const double z = i * 100;

        data->setField(dimC, i, x);
        data->setField(dimX, i, y);
        data->setField(dimY, i, z);
        data->setNumPoints(i+1);

    }
    BOOST_CHECK(data->getCapacity() ==17);
    BOOST_CHECK(data->getNumPoints() ==17);
    return data;
}

boost::uint32_t Predicate::processBuffer(PointBuffer& data, pdal::plang::BufferedInvocation& python) const
{
    python.resetArguments();

    python.beginChunk(data);

    python.execute();

    if (!python.hasOutputVariable("Mask"))
    {
        throw python_error("Mask variable not set in predicate filter function");
    }

    boost::uint8_t* mask = new boost::uint8_t[data.getNumPoints()];

    PointBuffer dstData(data.getSchema(), data.getCapacity());

    python.extractResult("Mask", (boost::uint8_t*)mask, data.getNumPoints(), 1, pdal::dimension::RawByte, 1);

    boost::uint8_t* dst = dstData.getData(0);
    boost::uint8_t* src = data.getData(0);

    const Schema& schema = dstData.getSchema();
    boost::uint32_t numBytes = schema.getByteSize();
    assert(numBytes == data.getSchema().getByteSize());

    boost::uint32_t numSrcPoints = data.getNumPoints();
    boost::uint32_t count = 0;
    for (boost::uint32_t srcIndex=0; srcIndex<numSrcPoints; srcIndex++)
    {
        if (mask[srcIndex])
        {
            memcpy(dst, src, numBytes);
            dst += numBytes;
            ++count;
            dstData.setNumPoints(count);
        }
        src += numBytes;
    }


    data.copyPointsFast(0, 0, dstData, count);
    data.setNumPoints(count);

    delete[] mask;

    return count;
}

void IteratorBase::fillUserBuffer(PointBuffer& user_buffer)
{

    Schema const& user_schema = user_buffer.getSchema();
    schema::index_by_index const& idx = user_schema.getDimensions().get<schema::index>();

    boost::int32_t numUserSpace = user_buffer.getCapacity() - user_buffer.getNumPoints();
    if (numUserSpace < 0)
        throw pdal_error("We ran out of space!");

    boost::int32_t numOraclePoints = m_active_buffer->getNumPoints() - m_buffer_position;

    schema::index_by_index::size_type i(0);
    for (i = 0; i < idx.size(); ++i)
    {
        copyDatabaseData(*m_active_buffer,
                         user_buffer,
                         idx[i],
                         m_buffer_position,
                         user_buffer.getNumPoints(),
                         (std::min)(numOraclePoints,numUserSpace));

    }

    bool bSetPointSourceId = getReader().getOptions().getValueOrDefault<bool>("populate_pointsourceid", false);
    if (bSetPointSourceId)
    {
        Dimension const* point_source_field = &(user_buffer.getSchema().getDimensionOptional("PointSourceId").get());
        if (point_source_field)
        {
            for (boost::int32_t i = 0; i < numUserSpace; ++i)
            {
                if (i < 0)
                    throw sqlite_driver_error("point_source_field point index is less than 0!");
                user_buffer.setField(*point_source_field, i, m_active_cloud_id);
            }
        }
    }

    if (numOraclePoints > numUserSpace)
        m_buffer_position = m_buffer_position + numUserSpace;
    else if (numOraclePoints < numUserSpace)
        m_buffer_position = 0;

    boost::uint32_t howManyThisRead = (std::min)(numUserSpace, numOraclePoints);
    user_buffer.setNumPoints(howManyThisRead + user_buffer.getNumPoints());
}

boost::uint32_t Reader::processBuffer(PointBuffer& data, boost::uint64_t index) const
{
    const Schema& schema = data.getSchema();

    // make up some data and put it into the buffer

    // how many are they asking for?
    boost::uint64_t numPointsWanted = data.getCapacity();

    // we can only give them as many as we have left
    boost::uint64_t numPointsAvailable = getNumPoints() - index;
    if (numPointsAvailable < numPointsWanted)
        numPointsWanted = numPointsAvailable;

    const Bounds<double>& bounds = getBounds();
    const std::vector< Range<double> >& dims = bounds.dimensions();
    const double minX = dims[0].getMinimum();
    const double maxX = dims[0].getMaximum();
    const double minY = dims[1].getMinimum();
    const double maxY = dims[1].getMaximum();
    const double minZ = dims[2].getMinimum();
    const double maxZ = dims[2].getMaximum();

    const double numDeltas = (double)getNumPoints() - 1.0;
    const double delX = (maxX - minX) / numDeltas;
    const double delY = (maxY - minY) / numDeltas;
    const double delZ = (maxZ - minZ) / numDeltas;

    const Dimension& dimX = schema.getDimension("X", getName());
    const Dimension& dimY = schema.getDimension("Y", getName());
    const Dimension& dimZ = schema.getDimension("Z", getName());
    const Dimension& dimTime = schema.getDimension("Time", getName());

    boost::uint64_t time = index;

    const Reader::Mode mode = getMode();

    boost::uint32_t cnt = 0;
    data.setNumPoints(0);

    for (boost::uint32_t pointIndex=0; pointIndex<numPointsWanted; pointIndex++)
    {
        double x;
        double y;
        double z;
        switch (mode)
        {
            case Reader::Random:
                x = Utils::random(minX, maxX);
                y = Utils::random(minY, maxY);
                z = Utils::random(minZ, maxZ);
                break;
            case Reader::Constant:
                x = minX;
                y = minY;
                z = minZ;
                break;
            case Reader::Ramp:
                x = minX + delX * pointIndex;
                y = minY + delY * pointIndex;
                z = minZ + delZ * pointIndex;
                break;
            default:
                throw pdal_error("invalid mode in FauxReader");
                break;
        }

        data.setField<double>(dimX, pointIndex, x);
        data.setField<double>(dimY, pointIndex, y);
        data.setField<double>(dimZ, pointIndex, z);
        data.setField<boost::uint64_t>(dimTime, pointIndex, time);

        ++time;

        ++cnt;
        data.setNumPoints(cnt);
        assert(cnt <= data.getCapacity());
    }

    return cnt;
}

uint32_t MrsidReader::processBuffer(PointBuffer& data, uint64_t index) const
{
    const Schema& schema = data.getSchema();

    // how many are they asking for?
    uint64_t numPointsWanted = data.getCapacity();

    // we can only give them as many as we have left
    uint64_t numPointsAvailable = getNumPoints() - index;
    if (numPointsAvailable < numPointsWanted)
        numPointsWanted = numPointsAvailable;


    LizardTech::PointData points;
    // to do:  specify a PointInfo structure that reads only the channels we will output.
    points.init(m_PS->getPointInfo(), (size_t)numPointsWanted);
    size_t count = m_iter->getNextPoints(points);

    uint32_t cnt = 0;
    data.setNumPoints(0);

    schema::index_by_index const& dims = schema.getDimensions().get<schema::index>();

    for (uint32_t pointIndex=0; pointIndex<count; pointIndex++)
    {
        ++cnt;

        for (unsigned int i=0; i < dims.size(); i++)
        {
            Dimension const& d = dims[i];

            if (d.getName() == "X" && d.getInterpretation() == dimension::Float && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_X))
            {
                double *pData = static_cast<double*>(points.getChannel(CHANNEL_NAME_X)->getData());
                double value = static_cast<double>(pData[pointIndex]);
                data.setField<double>(d, pointIndex, value);
            }
            else if (d.getName() == "X" && d.getInterpretation() == dimension::SignedInteger && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_X))
            {
                double *pData = static_cast<double*>(points.getChannel(CHANNEL_NAME_X)->getData());
                int32_t value = static_cast<int32_t>(pData[pointIndex]);
                data.setField<int32_t>(d, pointIndex, value);
            }
            else if (d.getName() == "Y" && d.getInterpretation() == dimension::Float && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_Y))
            {
                double *pData = static_cast<double*>(points.getChannel(CHANNEL_NAME_Y)->getData());
                double value = static_cast<double>(pData[pointIndex]);
                data.setField<double>(d, pointIndex, value);
            }
            else if (d.getName() == "Y" && d.getInterpretation() == dimension::SignedInteger && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_Y))
            {
                double *pData = static_cast<double*>(points.getChannel(CHANNEL_NAME_Y)->getData());
                int32_t value = static_cast<int32_t>(pData[pointIndex]);
                data.setField<int32_t>(d, pointIndex, value);
            }
            else if (d.getName() == "Z" && d.getInterpretation() == dimension::Float && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_Z))
            {
                double *pData = static_cast<double*>(points.getChannel(CHANNEL_NAME_Z)->getData());
                double value = static_cast<double>(pData[pointIndex]);
                data.setField<double>(d, pointIndex, value);
            }
            else if (d.getName() == "Z" && d.getInterpretation() == dimension::SignedInteger && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_Z))
            {
                double *pData = static_cast<double*>(points.getChannel(CHANNEL_NAME_Z)->getData());
                int32_t value = static_cast<int32_t>(pData[pointIndex]);
                data.setField<int32_t>(d, pointIndex, value);
            }
            else if (d.getName() == "Time" && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_GPSTime))
            {
                double *pData = static_cast<double*>(points.getChannel(CHANNEL_NAME_GPSTime)->getData());
                uint64_t  value = static_cast<uint64_t>(pData[pointIndex]);
                data.setField<uint64_t>(d, pointIndex, value);
            }
            else if (d.getName() == "Intensity" && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_Intensity))
            {
                uint16_t *pData = static_cast<uint16_t*>(points.getChannel(CHANNEL_NAME_Intensity)->getData());
                uint16_t value = static_cast<uint16_t>(pData[pointIndex]);
                data.setField<uint16_t>(d, pointIndex, value);
            }
            else if (d.getName() == "ReturnNumber" && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_ReturnNum))
            {
                uint8_t *pData = static_cast<uint8_t*>(points.getChannel(CHANNEL_NAME_ReturnNum)->getData());
                uint8_t value = static_cast<uint8_t>(pData[pointIndex]);
                data.setField<uint8_t>(d, pointIndex, value);
            }
            else if (d.getName() == "NumberOfReturns" && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_NumReturns))
            {
                uint8_t *pData = static_cast<uint8_t*>(points.getChannel(CHANNEL_NAME_NumReturns)->getData());
                uint8_t value = static_cast<uint8_t>(pData[pointIndex]);
                data.setField<uint8_t>(d, pointIndex, value);
            }
            else if (d.getName() == "ScanDirectionFlag" && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_ScanDir))
            {
                uint8_t *pData = static_cast<uint8_t*>(points.getChannel(CHANNEL_NAME_NumReturns)->getData());
                uint8_t value = static_cast<uint8_t>(pData[pointIndex]);
                data.setField<uint8_t>(d, pointIndex, value);
            }
            else if (d.getName() == "ScanAngleRank" && m_PS->getPointInfo().hasChannel(CHANNEL_NAME_ScanAngle))
            {
                int8_t *pData = static_cast<int8_t*>(points.getChannel(CHANNEL_NAME_NumReturns)->getData());
//.........这里部分代码省略.........

boost::uint32_t IteratorBase::myReadBlocks(PointBuffer& user_buffer)
{
    boost::uint32_t numPointsRead = 0;

    std::string const& query = getReader().getOptions().getValueOrThrow<std::string>("query");

    ::soci::row block;
    ::soci::indicator ind = ::soci::i_null;


    ::soci::statement blocks = (m_session->prepare << query, ::soci::into(block, ind));
    blocks.execute();

    bool bDidRead = blocks.fetch();

    // if (ind == ::soci::i_null)
    // {
    //     // We have no points to return
    //     getReader().log()->get(logDEBUG) << "Query returned no points" << std::endl;
    //     return 0;
    // }

    //
    // size_t size = block.size();
    // for (size_t i = 0; i < size; ++i)
    // {
    //     getReader().log()->get(logDEBUG3) << "column: " << block.get_properties(i).get_name() << std::endl;
    // }
    if (!m_active_buffer)
    {
        m_active_buffer = fetchPointBuffer(block.get<int>("cloud_id"),
                                           block.get<std::string>("schema"),
                                           user_buffer.getCapacity());
        m_active_cloud_id = block.get<int>("cloud_id");
    }
    //
    // This shouldn't ever happen
    int num_points = block.get<int>("num_points");
    if (num_points > static_cast<boost::int32_t>(m_active_buffer->getCapacity()))
    {
        std::ostringstream oss;
        oss << "Block size, " << num_points <<", is too large to fit in "
            << "buffer of size " << user_buffer.getCapacity() <<". Increase buffer capacity with writer's \"chunk_size\" option "
            << "or increase the read buffer size";
        throw buffer_too_small(oss.str());
    }


    while (bDidRead)
    {
        boost::uint32_t numReadThisBlock = static_cast<boost::uint32_t>(block.get<int>("num_points"));
        boost::uint32_t numSpaceLeftThisBuffer = user_buffer.getCapacity() - user_buffer.getNumPoints();

        getReader().log()->get(logDEBUG4) << "IteratorBase::myReadBlocks:" "numReadThisBlock: "
                                          << numReadThisBlock << " numSpaceLeftThisBlock: "
                                          << numSpaceLeftThisBuffer << " total numPointsRead: "
                                          << numPointsRead << std::endl;

        numPointsRead = numPointsRead + numReadThisBlock;

        readBlob(block, (std::min)(numReadThisBlock, numSpaceLeftThisBuffer));
        fillUserBuffer(user_buffer);

        bDidRead = blocks.fetch();
        // if (!bDidRead)
        //     return user_buffer.getNumPoints();

        boost::int32_t const& current_cloud_id = block.get<int>("cloud_id");
        if (current_cloud_id != m_active_cloud_id)
        {


            getReader().log()->get(logDEBUG3) << "IteratorBase::myReadBlocks: current_cloud_id: "
                                              << current_cloud_id << " m_active_cloud_id: "
                                              << m_active_cloud_id << std::endl;
            m_active_buffer = fetchPointBuffer(current_cloud_id, block.get<std::string>("schema"), user_buffer.getCapacity());

            m_active_cloud_id = current_cloud_id;
            return user_buffer.getNumPoints();
        }

    }


    return numPointsRead;
}

// append all points from src buffer to end of dst buffer, based on the our bounds
boost::uint32_t Crop::processBuffer(PointBuffer& dstData, const PointBuffer& srcData) const
{
    const Schema& schema = dstData.getSchema();

    const Bounds<double>& bounds = this->getBounds();

    boost::uint32_t numSrcPoints = srcData.getNumPoints();
    boost::uint32_t dstIndex = dstData.getNumPoints();

    boost::uint32_t numPointsAdded = 0;

    boost::optional<Dimension const&> dimX = schema.getDimension("X");
    boost::optional<Dimension const&> dimY = schema.getDimension("Y");
    boost::optional<Dimension const&> dimZ = schema.getDimension("Z");

    for (boost::uint32_t srcIndex=0; srcIndex<numSrcPoints; srcIndex++)
    {
        // need to scale the values
        double x(0.0);
        double y(0.0);
        double z(0.0);
        
        if (dimX->getInterpretation() == dimension::SignedInteger )
        {
            boost::int32_t xi = srcData.getField<boost::int32_t>(*dimX, srcIndex);
            boost::int32_t yi = srcData.getField<boost::int32_t>(*dimY, srcIndex);
            boost::int32_t zi = srcData.getField<boost::int32_t>(*dimZ, srcIndex);

            x = dimX->applyScaling(xi);
            y = dimY->applyScaling(yi);
            z = dimZ->applyScaling(zi);
            
        }
        else if (dimX->getInterpretation() == dimension::UnsignedInteger)
        {
            boost::uint32_t xi = srcData.getField<boost::uint32_t>(*dimX, srcIndex);
            boost::uint32_t yi = srcData.getField<boost::uint32_t>(*dimY, srcIndex);
            boost::uint32_t zi = srcData.getField<boost::uint32_t>(*dimZ, srcIndex);

            x = dimX->applyScaling(xi);
            y = dimY->applyScaling(yi);
            z = dimZ->applyScaling(zi);
            
        } else
        {
            x = srcData.getField<double>(*dimX, srcIndex);
            y = srcData.getField<double>(*dimY, srcIndex);
            z = srcData.getField<double>(*dimZ, srcIndex);

        }
     
        Vector<double> point(x,y,z);
    
        if (bounds.contains(point))
        {
            dstData.copyPointFast(dstIndex, srcIndex, srcData);
            dstData.setNumPoints(dstIndex+1);
            ++dstIndex;
            ++numPointsAdded;
        }
    }

    assert(dstIndex <= dstData.getCapacity());

    return numPointsAdded;
}

boost::uint32_t IteratorBase::myReadBlocks(PointBuffer& user_buffer)
{
    boost::uint32_t numPointsRead = 0;

    user_buffer.setNumPoints(0);

    bool bDidRead = false;

    if (!m_oracle_buffer)
    {
        m_oracle_buffer = fetchPointBuffer(m_initialQueryStatement, m_block->pc);
        if (!m_oracle_buffer) throw pdal_error("m_oracle_buffer was NULL!");
        m_dimension_map = fetchDimensionMap(m_initialQueryStatement, m_block->pc, *m_oracle_buffer, user_buffer);
        
        boost::int32_t current_cloud_id(0);
        current_cloud_id  = m_initialQueryStatement->GetInteger(&m_block->pc->pc_id);
        m_active_cloud_id = current_cloud_id;
    }

    // This shouldn't ever happen
    if (m_block->num_points > static_cast<boost::int32_t>(m_oracle_buffer->getCapacity()))
    {
        m_oracle_buffer->resize(m_block->num_points);
    }

    if (!m_block->num_points)
    {
        // We still have a block of data from the last readBuffer call
        // that was partially read.
        getReader().log()->get(logDEBUG3) << "IteratorBase::myReadBlocks: fetching first block" << std::endl;
        bDidRead = m_initialQueryStatement->Fetch();
        if (!bDidRead)
        {
            m_at_end = true;
            return 0;
        }

        user_buffer.setSpatialBounds(getBounds(m_initialQueryStatement, m_block));

    }
    else
    {
        // Our read was already "done" last readBuffer call, but if we're done,
        // we're done
        if (m_at_end)
            getReader().log()->get(logDEBUG3) << "IteratorBase::myReadBlocks: we are at end of the blocks;" << std::endl;
        else
            getReader().log()->get(logDEBUG3) << "IteratorBase::myReadBlocks: we have points left to read on this block" << std::endl;

        if (m_at_end) return 0;
        bDidRead = true;

    }

    while (bDidRead)
    {
        boost::uint32_t numReadThisBlock = m_block->num_points;
        boost::uint32_t numSpaceLeftThisBuffer = user_buffer.getCapacity() - user_buffer.getNumPoints();

        getReader().log()->get(logDEBUG4) << "IteratorBase::myReadBlocks:" "numReadThisBlock: "
                                          << numReadThisBlock << " numSpaceLeftThisBlock: "
                                          << numSpaceLeftThisBuffer << " total numPointsRead: "
                                          << numPointsRead << std::endl;

        numPointsRead = numPointsRead + numReadThisBlock;

        readBlob(m_initialQueryStatement, m_block, m_block->num_points);
        fillUserBuffer(user_buffer);
        if (m_buffer_position != 0)
        {
            return user_buffer.getNumPoints();
        }
        else
        {
            bDidRead = m_initialQueryStatement->Fetch();
            if (!bDidRead)
            {
                getReader().log()->get(logDEBUG3) << "IteratorBase::myReadBlocks: done reading block. Read " << numPointsRead << " points" << std::endl;
                m_at_end = true;
                return user_buffer.getNumPoints();
            }
        }

        boost::int32_t current_cloud_id(0);
        current_cloud_id  = m_initialQueryStatement->GetInteger(&m_block->pc->pc_id);

        getReader().log()->get(logDEBUG3) << "IteratorBase::myReadBlocks: current_cloud_id: "
                                          << current_cloud_id << " m_active_cloud_id: "
                                          << m_active_cloud_id << std::endl;

        if (current_cloud_id != m_active_cloud_id)
        {
            m_oracle_buffer = fetchPointBuffer(m_initialQueryStatement, m_block->pc);
            if (!m_oracle_buffer) throw pdal_error("m_oracle_buffer was NULL!");
            m_dimension_map = fetchDimensionMap(m_initialQueryStatement, m_block->pc, *m_oracle_buffer, user_buffer);

            m_active_cloud_id = current_cloud_id;
            return user_buffer.getNumPoints();
        }

//.........这里部分代码省略.........

boost::uint32_t Reader::readBufferImpl(PointBuffer& data)
{
    m_log->get(logDEBUG5) << "Reading a point buffer of " <<
        data.getCapacity() << " points." << std::endl;
    return m_reader.processBuffer(data, getIndex());
}