private void LoadSegment(int offset)
{
int currentBuffer = offsets[0] >= 0 ? 0 : 1;
if (offset - offsets[currentBuffer] < 0 || offset - offsets[currentBuffer] >= 4096)
{
int segmentStart = offset / 4096 * 4096;
if (wrotePages.Contains(segmentStart))
{
if (lastSegment == segmentStart)
{
IOProxy.getInst().LoadSegment(level, segmentStart, buffer[1 - currentBuffer], dataLength - lastSegment);
}
else
{
IOProxy.getInst().LoadSegment(level, segmentStart, buffer[1 - currentBuffer], 4096);
}
}
else
{
Array.Clear(buffer[1 - currentBuffer], 0, 4096);
}
offsets[1 - currentBuffer] = segmentStart;
if (offsets[currentBuffer] >= 0)
{
WriteSegment(currentBuffer);
}
}
}
public TaskDirectory(int level, int minRow, int maxRow, int minCol, int maxCol)
{
buffer = new byte[2][];
buffer[0] = new byte[4096];
buffer[1] = new byte[4096];
offsets = new int[2];
offsets[0] = 0;
offsets[1] = -1;
validCount = 0;
startRow = minRow;
endRow = maxRow;
startCol = minCol;
endCol = maxCol;
this.level = level;
rowCount = maxRow - minRow + 1;
colCount = maxCol - minCol + 1;
int totalCount = rowCount * colCount;
int tableLength = totalCount % 8 == 0 ? totalCount / 8 : totalCount / 8 + 1;
dataLength = tableLength + 28;
lastSegment = dataLength / 4096 * 4096;
buffer[0][0] = 0xFF;
buffer[0][1] = (byte)level;
Array.Copy(IOProxy.getInst().l2b(dataLength, 4), 0, buffer[0], 2, 4);
Array.Copy(IOProxy.getInst().l2b(minRow, 4), 0, buffer[0], 6, 4);
Array.Copy(IOProxy.getInst().l2b(maxRow, 4), 0, buffer[0], 10, 4);
Array.Copy(IOProxy.getInst().l2b(minCol, 4), 0, buffer[0], 14, 4);
Array.Copy(IOProxy.getInst().l2b(maxCol, 4), 0, buffer[0], 18, 4);
int fileOffset = IOProxy.getInst().recommendOffset();
IOProxy.getInst().setLevelOffset(level, fileOffset, dataLength);
wrotePages = new List <int>();
}
public void Finish()
{
LoadSegment(0);
int currentBuffer = offsets[0] >= 0 ? 0 : 1;
Array.Copy(IOProxy.getInst().l2b(validCount, 4), 0, buffer[currentBuffer], 22, 4);
WriteSegment(currentBuffer);
}
public static IOProxy getInst()
{
if (_inst == null)
{
_inst = new IOProxy();
}
return(_inst);
}
private void WriteSegment(int currentBuffer)
{
if (lastSegment == offsets[currentBuffer])
{
buffer[currentBuffer][dataLength - lastSegment - 2] = 0xFF;
buffer[currentBuffer][dataLength - lastSegment - 1] = 0xFE;
IOProxy.getInst().WriteSegment(level, offsets[currentBuffer], buffer[currentBuffer], dataLength - lastSegment);
}
else
{
IOProxy.getInst().WriteSegment(level, offsets[currentBuffer], buffer[currentBuffer], 4096);
}
if (!wrotePages.Contains(offsets[currentBuffer]))
{
wrotePages.Add(offsets[currentBuffer]);
}
offsets[currentBuffer] = -1;
}
protected override void DoConvertToMBTiles(string outputPath, string name, string description, string attribution, int[] levels, Geometry geometry, bool doCompact)
{
Util.Envelope initial;
Point pLeftTop;
Point pRightBottom;
if (geometry is Envelope)
{
initial = geometry as Envelope;
pLeftTop = Utility.GeographicToWebMercator(new Util.Point(initial.XMin, initial.YMax));
pRightBottom = Utility.GeographicToWebMercator(new Util.Point(initial.XMax, initial.YMin));
}
else
{
Polygon temp = geometry as Polygon;
pLeftTop = new Util.Point(temp.Extent.XMin, temp.Extent.YMax);
pRightBottom = new Util.Point(temp.Extent.XMax, temp.Extent.YMin);
Point GPS_pLeftTop = Utility.WebMercatorToGeographic(pLeftTop);
Point GPS_pRightBottom = Utility.WebMercatorToGeographic(pRightBottom);
initial = new Envelope(GPS_pLeftTop.X, GPS_pRightBottom.Y, GPS_pRightBottom.X, GPS_pLeftTop.Y);
}
Envelope downloadExtentMercator = new Envelope(pLeftTop.X, pRightBottom.Y, pRightBottom.X, pLeftTop.Y);
_outputFile = outputPath;
_downloadGeometry = geometry;
_convertingStatus.IsInProgress = true;
try
{
CreateMBTilesFileAndWriteMetaData(outputPath, name, description, attribution, initial);
if (autoCorrectCoord)
{
CreateCCMBTilesFile(outputPath, name, description, attribution, initial);
}
_outputconn = new SQLiteConnection("Data source = " + base._outputFile);
_outputconn.Open();
#region calculate startCol/Row and endCol/Row and tiles count of each level
_convertingStatus.TotalCount = 0;
string[] keyTileInfos = new string[levels.Length];
int[] tilesCountOfLevel = new int[levels.Length];
for (int i = 0; i < levels.Length; i++)
{
LODInfo lod = TilingScheme.LODs[levels[i]];
double oneTileDistance = lod.Resolution * 256;
int level = TilingScheme.LODs[levels[i]].LevelID;
int startTileRow = (int)(Math.Abs(TilingScheme.TileOrigin.Y - geometry.Extent.YMax) / oneTileDistance);
int startTileCol = (int)(Math.Abs(TilingScheme.TileOrigin.X - geometry.Extent.XMin) / oneTileDistance);
int endTileRow = (int)(Math.Abs(TilingScheme.TileOrigin.Y - geometry.Extent.YMin) / oneTileDistance);
int endTileCol = (int)(Math.Abs(TilingScheme.TileOrigin.X - geometry.Extent.XMax) / oneTileDistance);
keyTileInfos[i] = string.Format("{0},{1},{2},{3}", startTileRow, startTileCol, endTileRow, endTileCol);
tilesCountOfLevel[i] = Math.Abs((endTileCol - startTileCol + 1) * (endTileRow - startTileRow + 1));
_convertingStatus.TotalCount += tilesCountOfLevel[i];
}
_totalCount = _convertingStatus.TotalCount;
_completeCount = _errorCount = 0;
_wroteBytes = _wroteCounts = 0;
#endregion
int arcgisTileCount = 0;
for (int i = 0; i < levels.Length; i++)
{
int level, startR, startC, endR, endC;//startTileRow,startTileCol,...
level = TilingScheme.LODs[levels[i]].LevelID;
startR = int.Parse(keyTileInfos[i].Split(new char[] { ',' })[0]);
startC = int.Parse(keyTileInfos[i].Split(new char[] { ',' })[1]);
endR = int.Parse(keyTileInfos[i].Split(new char[] { ',' })[2]);
endC = int.Parse(keyTileInfos[i].Split(new char[] { ',' })[3]);
_convertingStatus.Level = level;
_convertingStatus.LevelTotalCount = tilesCountOfLevel[i];
_convertingStatus.LevelCompleteCount = _convertingStatus.LevelErrorCount = 0;
_levelTotalCount = _convertingStatus.LevelTotalCount;
_levelCompleteCount = _levelErrorCount = 0;
SaveOneLevelTilesToMBTiles(level, startR, startC, endR, endC);
if (autoCorrectCoord)
{
RCRange range = BaiDuMapManager.inst.getArcgisRCRangeFromMercator(downloadExtentMercator, levels[i]);
startR = range.MinRow;
startC = range.MinCol;
endR = range.MaxRow;
endC = range.MaxCol;
recordScope(level, startR, startC, endR, endC);
arcgisTileCount += (endR - startR + 1) * (endC - startC + 1);
}
if (_convertingStatus.IsCancelled)
{
_convertingStatus.IsCompletedSuccessfully = false;
break;
}
}
IOProxy.getInst().Dispose();
recordCount(arcgisTileCount);
if (doCompact)
{
_convertingStatus.IsDoingCompact = true;
_convertingStatus.SizeBeforeCompact = new FileInfo(_outputFile).Length;
CompactMBTiles(_outputFile);
_convertingStatus.IsDoingCompact = false;
_convertingStatus.SizeAfterCompact = new FileInfo(_outputFile).Length;
}
if (!_convertingStatus.IsCancelled)
{
_convertingStatus.IsCompletedSuccessfully = true;
}
}
finally
{
if (_correctOutputconn != null)
{
_correctOutputconn.Dispose();
}
RecoverFailure();
_convertingStatus.IsInProgress = false;
_convertingStatus.IsCommittingTransaction = false;
_convertingStatus.IsDoingCompact = false;
_outputconn.Close();
_outputconn.Dispose();
}
}