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, BmpInfoHeader infoHeader)
{
writer.Write(infoHeader.HeaderSize);
writer.Write(infoHeader.Width);
writer.Write(infoHeader.Height);
writer.Write(infoHeader.Planes);
writer.Write(infoHeader.BitsPerPixel);
writer.Write((int)infoHeader.Compression);
writer.Write(infoHeader.ImageSize);
writer.Write(infoHeader.XPelsPerMeter);
writer.Write(infoHeader.YPelsPerMeter);
writer.Write(infoHeader.ClrUsed);
writer.Write(infoHeader.ClrImportant);
}
private void ReadInfoHeader()
{
byte[] data = new byte[BmpInfoHeader.Size];
_stream.Read(data, 0, BmpInfoHeader.Size);
_infoHeader = new BmpInfoHeader();
_infoHeader.HeaderSize = BitConverter.ToInt32(data, 0);
_infoHeader.Width = BitConverter.ToInt32(data, 4);
_infoHeader.Height = BitConverter.ToInt32(data, 8);
_infoHeader.Planes = BitConverter.ToInt16(data, 12);
_infoHeader.BitsPerPixel = BitConverter.ToInt16(data, 14);
_infoHeader.ImageSize = BitConverter.ToInt32(data, 20);
_infoHeader.XPelsPerMeter = BitConverter.ToInt32(data, 24);
_infoHeader.YPelsPerMeter = BitConverter.ToInt32(data, 28);
_infoHeader.ClrUsed = BitConverter.ToInt32(data, 32);
_infoHeader.ClrImportant = BitConverter.ToInt32(data, 36);
_infoHeader.Compression = (BmpCompression)BitConverter.ToInt32(data, 16);
}
