public void Encode(Image image, Stream stream)
{
int rowWidth = image.Width;
int amount = (image.Width * 3) % 4;
if (amount != 0)
{
rowWidth += 4 - amount;
}
BinaryWriter writer = new BinaryWriter(stream);
BmpFileHeader fileHeader = new BmpFileHeader();
fileHeader.Type = 19778;
fileHeader.Offset = 54;
fileHeader.FileSize = 54 + image.Height * rowWidth * 3;
Write(writer, fileHeader);
BmpInfoHeader infoHeader = new BmpInfoHeader();
infoHeader.HeaderSize = 40;
infoHeader.Height = image.Height;
infoHeader.Width = image.Width;
infoHeader.BitsPerPixel = 24;
infoHeader.Planes = 1;
infoHeader.Compression = BmpCompression.RGB;
infoHeader.ImageSize = image.Height * rowWidth * 3;
infoHeader.ClrUsed = 0;
infoHeader.ClrImportant = 0;
Write(writer, infoHeader);
WriteImage(writer, image);
writer.Flush();
}
private static void Write(BinaryWriter writer, BmpFileHeader fileHeader)
{
writer.Write(fileHeader.Type);
writer.Write(fileHeader.FileSize);
writer.Write(fileHeader.Reserved);
writer.Write(fileHeader.Offset);
}
private void ReadFileHeader()
{
byte[] data = new byte[BmpFileHeader.Size];
_stream.Read(data, 0, BmpFileHeader.Size);
_fileHeader = new BmpFileHeader();
_fileHeader.Type = BitConverter.ToInt16(data, 0);
_fileHeader.FileSize = BitConverter.ToInt32(data, 2);
_fileHeader.Reserved = BitConverter.ToInt32(data, 6);
_fileHeader.Offset = BitConverter.ToInt32(data, 10);
}
