public static BitmapHeader GetHeader(MemoryMappedViewAccessor Reader, out long MMPosition)
{
MMPosition = 0;
var header = new BitmapHeader();
header.Type = Encoding.ASCII.GetString(new byte[] { Reader.ReadByte(MMPosition) });
MMPosition++;
header.Type += Encoding.ASCII.GetString(new byte[] { Reader.ReadByte(MMPosition) });
MMPosition++;
header.FileSize = Reader.ReadInt32(MMPosition);
MMPosition += 4;
header.Reserved = Reader.ReadInt32(MMPosition);
MMPosition += 4;
header.Offset = Reader.ReadInt32(MMPosition);
MMPosition += 4;
header.BitmapInfoHeaderSize = Reader.ReadInt32(MMPosition);
MMPosition += 4;
return(header);
}
public static BigBitmap CreateBigBitmapFromBitmap(Stream Stream, string BigBitmapFilePath)
{
using (var Reader = new StreamReader(Stream))
{
using (var BigBitmapFile = new FileStream(BigBitmapFilePath, FileMode.Create, FileAccess.ReadWrite))
{
byte[] data = new byte[40];
Stream.Read(data, 0, 18);
var header = BitmapHeader.GetHeader(data);
Stream.Read(data, 0, 36);
var infoHeader = BitmapInfoHeader.GetInfoHeader(data);
if (infoHeader.BitsPerPixel != 24)
{
throw new InvalidOperationException("Only 24bpp Bitmaps Supported");
}
var bigBitmap = new BigBitmap();
bigBitmap.FileHeader = new BigBitmapHeader();
bigBitmap.FileHeader.FileSize = header.FileSize;
bigBitmap.FileInfoHeader = new BigBitmapInfoHeader();
bigBitmap.FileInfoHeader.BitmapHeight = infoHeader.BitmapHeight;
bigBitmap.FileInfoHeader.BitmapWidth = infoHeader.BitmapWidth;
bigBitmap.FileInfoHeader.BitsPerPixel = infoHeader.BitsPerPixel;
bigBitmap.FileInfoHeader.ColorDataSize = infoHeader.ColorDataSize;
bigBitmap.FileInfoHeader.ColorPlanes = infoHeader.ColorPlanes;
bigBitmap.FileInfoHeader.Colors = infoHeader.Colors;
bigBitmap.FileInfoHeader.CompressinoMethod = infoHeader.CompressinoMethod;
bigBitmap.FileInfoHeader.HorizantalResolution = infoHeader.HorizantalResolution;
bigBitmap.FileInfoHeader.IColors = infoHeader.IColors;
bigBitmap.FileInfoHeader.VerticalResolution = infoHeader.VerticalResolution;
data = bigBitmap.FileHeader.CreateBigBitmapHeader();
BigBitmapFile.Write(data, 0, data.Length);
data = bigBitmap.FileInfoHeader.CreateInfoHeaderData(infoHeader.ColorDataSize);
BigBitmapFile.Write(data, 0, data.Length);
int bytesRead = -1;
while ((bytesRead = Stream.Read(data, 0, data.Length)) != 0)
{
BigBitmapFile.Write(data, 0, bytesRead);
}
BigBitmapFile.Flush();
BigBitmapFile.Close();
return(new BigBitmap(BigBitmapFilePath));
}
}
}
public static BitmapHeader GetHeader(byte[] data)
{
var header = new BitmapHeader();
using (var s = new MemoryStream(data))
using (var reader = new BinaryReader(s))
{
header.Type = Encoding.ASCII.GetString(data, 0, 2);
s.Seek(2, SeekOrigin.Begin);
header.FileSize = reader.ReadInt32();
header.Reserved = reader.ReadInt32();
header.Offset = reader.ReadInt32();
header.BitmapInfoHeaderSize = reader.ReadInt32();
}
return(header);
}
public Bitmap ConvertToBitmap()
{
if (FileHeader.FileSize > int.MaxValue - 70)
{
throw new InvalidOperationException("File Size is too big, Try using \"Chunk\" method to get smaller Picture Size");
}
if (FileInfoHeader.BitmapHeight > int.MaxValue || FileInfoHeader.BitmapWidth > int.MaxValue || FileInfoHeader.ColorDataSize > int.MaxValue)
{
throw new InvalidOperationException("Color Data (Height or Width) is(are) too high, Cant fit one (or more) in \"Int\" DataType");
}
Bitmap map = null;
using (var ms = new MemoryStream())
{
var header = new BitmapHeader();
header.FileSize = (int)FileHeader.FileSize - 16;
var headerInfo = new BitmapInfoHeader();
headerInfo.BitmapHeight = (int)FileInfoHeader.BitmapHeight;
headerInfo.BitmapWidth = (int)FileInfoHeader.BitmapWidth;
headerInfo.BitsPerPixel = FileInfoHeader.BitsPerPixel;
headerInfo.ColorPlanes = FileInfoHeader.ColorPlanes;
headerInfo.HorizantalResolution = FileInfoHeader.HorizantalResolution;
headerInfo.VerticalResolution = FileInfoHeader.VerticalResolution;
var data = header.CreateBitmapHeader();
ms.Write(data, 0, data.Length);
data = headerInfo.CreateInfoHeaderData((int)FileInfoHeader.ColorDataSize);
ms.Write(data, 0, data.Length);
data = null;
for (int i = 0; i < header.FileSize - 54; i++) // 54 = 70 - 16
{
SeektoPage(i + 70);
ms.WriteByte(Reader.ReadByte(((i + 70) % MemoryPageSize)));
}
map = new Bitmap(ms);
}
return(map);
}
public void ConvertAndSaveToBitmap(string Path)
{
using (var file = new FileStream(Path, FileMode.Create, FileAccess.ReadWrite))
{
if (FileHeader.FileSize > int.MaxValue - 70)
{
throw new InvalidOperationException("File Size is too big, Try using \"Chunk\" method to get smaller Picture Size");
}
if (FileInfoHeader.BitmapHeight > int.MaxValue || FileInfoHeader.BitmapWidth > int.MaxValue || FileInfoHeader.ColorDataSize > int.MaxValue)
{
throw new InvalidOperationException("Color Data (Height or Width) is(are) too high, Cant fit one field (or more) in \"Int\" DataType");
}
var header = new BitmapHeader();
header.FileSize = (int)FileHeader.FileSize - 16; // 70-54=16 is difference between our new "bigbitmap" header and original bitmapheader
var headerInfo = new BitmapInfoHeader();
headerInfo.BitmapHeight = (int)FileInfoHeader.BitmapHeight;
headerInfo.BitmapWidth = (int)FileInfoHeader.BitmapWidth;
headerInfo.BitsPerPixel = FileInfoHeader.BitsPerPixel;
headerInfo.ColorPlanes = FileInfoHeader.ColorPlanes;
headerInfo.HorizantalResolution = FileInfoHeader.HorizantalResolution;
headerInfo.VerticalResolution = FileInfoHeader.VerticalResolution;
var data = header.CreateBitmapHeader();
file.Write(data, 0, data.Length);
data = headerInfo.CreateInfoHeaderData((int)FileInfoHeader.ColorDataSize);
file.Write(data, 0, data.Length);
for (int i = 0; i < header.FileSize - 54; i++) // 54 = 70 - 16
{
SeektoPage(i + 70);
file.WriteByte(Reader.ReadByte(((i + 70) % MemoryPageSize)));
}
file.Flush();
file.Close();
}
}
public Bitmap GetChunk(long width, long height, long x, long y)
{
if (width * height * 3 >= int.MaxValue)
{
throw new InvalidOperationException("Chunk Size is too big");
}
if (width + x > FileInfoHeader.BitmapWidth)
{
width = FileInfoHeader.BitmapWidth - x;
}
if (height + y > FileInfoHeader.BitmapHeight)
{
height = FileInfoHeader.BitmapHeight;
}
var newRowSize = (int)Math.Floor(((double)FileInfoHeader.BitsPerPixel * width + 31) / 32) * 4;
var newPadding = (newRowSize - width * 3);
var Data2Read = (int)(newRowSize - newPadding);
IEnumerable <byte> Chunk = null;
byte[] rawData = new byte[Data2Read];
long startByteIndex = -1;
int BytesRead = -1;
for (long i = FileInfoHeader.BitmapHeight - (y + height); i < (FileInfoHeader.BitmapHeight - y); i++)
{
startByteIndex = 70 + (x * 3) + (i * RowSize) - 1;
SeektoPage(startByteIndex);
BytesRead = Reader.ReadArray <byte>(startByteIndex % MemoryPageSize,
rawData, 0, Data2Read);
if (newPadding != 0)
{
rawData = rawData.Concat(new byte[newPadding]).ToArray();
}
if (Chunk == null)
{
if (BytesRead != Data2Read)
{
Chunk = rawData.SubArray(0, BytesRead);
Offset += BytesRead;
if (Offset + VirtualSize >= MmfInfo.Length)
{
VirtualSize = MmfInfo.Length - Offset;
}
else
{
VirtualSize = MemoryPagesForVirutalMemoryBuffer * MemoryPageSize;
}
Reader.Dispose();
Reader = Mmf.CreateViewAccessor(Offset, VirtualSize);
BytesRead += Reader.ReadArray <byte>(Offset % MemoryPageSize, rawData, BytesRead, rawData.Length - BytesRead);
if (BytesRead != RowSize)
{
Chunk = Chunk.Concat(rawData.SubArray(0, BytesRead));
}
else
{
Chunk = Chunk.Concat(rawData);
}
}
else
{
Chunk = rawData;
}
}
else
if (BytesRead != Data2Read)
{
Chunk = Chunk.Concat(rawData.SubArray(0, BytesRead));
Offset += BytesRead;
if (Offset + VirtualSize >= MmfInfo.Length)
{
VirtualSize = MmfInfo.Length - Offset;
}
else
{
VirtualSize = MemoryPagesForVirutalMemoryBuffer * MemoryPageSize;
}
Reader.Dispose();
Reader = Mmf.CreateViewAccessor(Offset, VirtualSize);
BytesRead += Reader.ReadArray <byte>(Offset % MemoryPageSize, rawData, BytesRead, rawData.Length - BytesRead);
if (BytesRead != RowSize)
{
Chunk = Chunk.Concat(rawData.SubArray(0, BytesRead));
}
else
{
Chunk = Chunk.Concat(rawData);
}
}
else
{
Chunk = Chunk.Concat(rawData);
}
}
var fileHeader = new BitmapHeader()
{
FileSize = Chunk.Count() + 54
};
var fileInfoHeader = new BitmapInfoHeader()
{
BitmapHeight = (int)height,
BitmapWidth = (int)width,
BitsPerPixel = FileInfoHeader.BitsPerPixel,
ColorPlanes = FileInfoHeader.ColorPlanes,
HorizantalResolution = FileInfoHeader.HorizantalResolution,
VerticalResolution = FileInfoHeader.VerticalResolution
};
var HeaderData = fileHeader.CreateBitmapHeader();
HeaderData = HeaderData.Concat(fileInfoHeader.CreateInfoHeaderData(Chunk.Count())).ToArray();
HeaderData = HeaderData.Concat(Chunk).ToArray();
using (var ms = new MemoryStream(HeaderData))
{ CurrentChunk = new Bitmap(ms); }
return(CurrentChunk);
}
