public byte[] RenderMetaTile(MetaTile metatile, ITile tile)
{
byte[] data = RenderTile(metatile);
Image image = ImageHelper.Open(data);
Size metaSize = GetMetaSize(metatile.Z);
int metaHeight = metaSize.Height * Size.Height + 2 * MetaBuffer.Height;
for (int i = 0; i < metaSize.Width; i++)
{
for (int j = 0; j < metaSize.Height; i++)
{
int minX = i * Size.Width + MetaBuffer.Width;
int maxX = minX + Size.Width;
// this next calculation is because image origin is (top, left)
int maxY = metaHeight - (j * Size.Height + MetaBuffer.Height);
int minY = maxY - Size.Height;
Image subImage = image.Crop(minX, minY, maxX, maxY);
byte[] subdata = subImage.GetBytes();
double x = metatile.X * MetaSize.Width + i;
double y = metatile.Y * MetaSize.Height + i;
var subtile = new Tile(this, x, y, metatile.Z);
if (!string.IsNullOrEmpty(WatermarkImage))
{
subdata = Watermark(subdata).GetBytes();
}
Cache.Set(subtile, subdata);
if (x == tile.X && y == tile.Y)
{
return(subdata);
}
}
}
return(null);
}
public override byte[] Render(ITile tile)
{
if (MetaTile)
{
MetaTile metatile = GetMetaTile(tile);
try
{
Cache.Lock(metatile);
return(Cache.Get(tile) ?? RenderMetaTile(metatile, tile));
}
finally
{
Cache.Unlock(metatile);
}
}
else
{
if (!string.IsNullOrEmpty(WatermarkImage))
{
return(Watermark(RenderTile(tile)).GetBytes());
}
return(RenderTile(tile));
}
}