internal DmtxScanGrid(DmtxDecode dec)
{
int scale = dec.Scale;
int smallestFeature = dec.ScanGap;
this._xMin = dec.XMin;
this._xMax = dec.XMax;
this._yMin = dec.YMin;
this._yMax = dec.YMax;
/* Values that get set once */
int xExtent = this._xMax - this._xMin;
int yExtent = this._yMax - this._yMin;
int maxExtent = (xExtent > yExtent) ? xExtent : yExtent;
if (maxExtent < 1)
{
throw new ArgumentException("Invalid max extent for Scan Grid: Must be greater than 0");
}
int extent = 1;
this._minExtent = extent;
for (; extent < maxExtent; extent = ((extent + 1) * 2) - 1)
{
if (extent <= smallestFeature)
{
_minExtent = extent;
}
}
this._maxExtent = extent ;
this._xOffset = (this._xMin + this._xMax - this._maxExtent) / 2;
this._yOffset = (this._yMin + this._yMax - this._maxExtent) / 2;
/* Values that get reset for every level */
this._total = 1;
this._extent = this._maxExtent;
this._jumpSize = this._extent + 1;
this._pixelTotal = 2 * this._extent - 1;
this._startPos = this._extent / 2;
this._pixelCount = 0;
this._xCenter = this._yCenter = this._startPos;
SetDerivedFields();
}
private List<string> DecodeImage(Bitmap image, int maxResultCount, TimeSpan timeOut, bool isMosaic)
{
List<string> result = new List<string>();
int stride;
byte[] rawImg = ImageToByteArray(image, out stride);
DmtxImage dmtxImg = new DmtxImage(rawImg, image.Width, image.Height, DmtxPackOrder.DmtxPack24bppRGB);
dmtxImg.RowPadBytes = stride % 3;
DmtxDecode decode = new DmtxDecode(dmtxImg, 1);
TimeSpan timeLeft = new TimeSpan(timeOut.Ticks);
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
while (true)
{
if (stopWatch.Elapsed > timeOut)
{
break;
}
DmtxRegion region = decode.RegionFindNext(timeOut);
if (region != null)
{
DmtxMessage msg = isMosaic ? decode.MosaicRegion(region, -1) : decode.MatrixRegion(region, -1);
string message = Encoding.ASCII.GetString(msg.Output);
message = message.Substring(0, message.IndexOf('\0'));
if (!result.Contains(message))
{
result.Add(message);
if (result.Count >= maxResultCount)
{
break;
}
}
}
else
{
break;
}
}
return result;
}