public ScanResult ReadInterleavedScan(DroppedFrameResponse droppedFrameResponse, bool useSymmetricXCoordinates, uint timeoutMilliseconds)
{
AssertValidHandle();
byte[] buffer1 = new byte[BufferLength];
byte[] buffer2 = new byte[BufferLength];
bool success = GetScanRawData(buffer1, timeoutMilliseconds);
if (!success)
{
return(null);
}
if (ScanResult.PeekImageNumber(buffer1) % 2 == 0)
{
// we want to start with an odd-numbered buffer, so repeat the process
success = GetScanRawData(buffer1, timeoutMilliseconds);
if (!success)
{
return(null);
}
}
// we now have a valid first image, get the second one
success = GetScanRawData(buffer2, timeoutMilliseconds);
if (!success)
{
return(null);
}
return(ScanResult.FromBufferPair(_scannerInformation, buffer1, buffer2, droppedFrameResponse, useSymmetricXCoordinates));
}
public ScanResult ReadInterleavedScan(DroppedFrameResponse droppedFrameResponse)
{
return(ReadInterleavedScan(droppedFrameResponse, useSymmetricXCoordinates: true, timeoutMilliseconds: DefaultTimeout));
}
public static ScanResult FromBufferPair(ScannerInformation scanInfo, byte[] buffer1, byte[] buffer2, DroppedFrameResponse droppedFrameResponse, bool useSymmetricXCoordinates)
{
var numXPixels = scanInfo.NumXPixels;
if (numXPixels != ExpectedNumberOfXPixels)
{
throw new ArgumentException("Unsupported number of X pixels.");
}
var encoderPosition = ReadSigned27BitValue(buffer1, EncoderPositionOffset);
var imageNumber = buffer1[ImageNumberOffset];
var secondImageNumber = buffer2[ImageNumberOffset];
if (secondImageNumber != imageNumber + 1)
{
// buffer pair is not sequential, we dropped a frame
switch (droppedFrameResponse)
{
case DroppedFrameResponse.ThrowException:
default:
throw new ApplicationException("Non-sequential buffer pair.");
case DroppedFrameResponse.Ignore:
case DroppedFrameResponse.IgnoreOnce:
return(null);
case DroppedFrameResponse.ReturnNonInterleaved:
return(FromSingleBuffer(scanInfo, buffer2, useSymmetricXCoordinates));
}
}
var xScale = scanInfo.XScaleFactor;
var zScale = scanInfo.ZScaleFactor;
var iScale = 1.0 / byte.MaxValue;
var xOffset = useSymmetricXCoordinates ? -(scanInfo.ScanRangeEnd / 10.0) / 2 : 0;
var points = new Vector3[2 * numXPixels];
for (int i = 0; i < numXPixels; i++)
{
var offset = ScanDataOffset + i * StrideOfScanData;
points[2 * i] = ReadVector(buffer1, offset, xScale, zScale, iScale, xOffset);
points[2 * i + 1] = ReadVector(buffer2, offset, xScale, zScale, iScale, xOffset);
}
return(new ScanResult(encoderPosition, imageNumber, secondImageNumber, points));
}
