private static void Write(BinaryWriter writer, BmpFileHeader fileHeader)
{
writer.Write(fileHeader.Type);
writer.Write(fileHeader.FileSize);
writer.Write(fileHeader.Reserved);
writer.Write(fileHeader.Offset);
}
public void TestWrite()
{
var header = new BmpFileHeader(1, 2, 3, 4);
var buffer = new byte[14];
header.WriteTo(buffer);
Assert.Equal("AQACAAAAAwAAAAQAAAA=", Convert.ToBase64String(buffer));
}
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);
}
public static bool WriteBmp(this RayImage img, Stream output)
{
try
{
var sizeFileHeader = Marshal.SizeOf <BmpFileHeader>();
//const int sizeFileHeader = 14;
var sizeInfoHeader = Marshal.SizeOf <BmpInfoHeader>();
//const int sizeInfoHeader = 40;
var sizePixels = img.Width * img.Height * 3;
var buffer = new byte[sizeFileHeader + sizeInfoHeader + sizePixels];
var span = new Span <byte>(buffer);
// write file header.
ref BmpFileHeader fileHeader = ref MemoryMarshal.Cast <byte, BmpFileHeader>(span)[0];
fileHeader.Signature = (int)('B') + ((int)('M') << 8);
fileHeader.FileSize = buffer.Length;
fileHeader.DataOffset = sizeFileHeader + sizeInfoHeader;
// write info header.
ref BmpInfoHeader infoHeader = ref MemoryMarshal.Cast <byte, BmpInfoHeader>(span.Slice(sizeFileHeader, sizeInfoHeader))[0];
/// <summary>
/// Encodes the data of the specified image and writes the result to
/// the specified stream.
/// </summary>
/// <param name="image">The image, where the data should be get from.
/// Cannot be null (Nothing in Visual Basic).</param>
/// <param name="stream">The stream, where the image data should be written to.
/// Cannot be null (Nothing in Visual Basic).</param>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="image"/> is null (Nothing in Visual Basic).</para>
/// <para>- or -</para>
/// <para><paramref name="stream"/> is null (Nothing in Visual Basic).</para>
/// </exception>
public void Encode(ImageBase image, Stream stream)
{
Guard.NotNull(image, "image");
Guard.NotNull(stream, "stream");
int rowWidth = image.PixelWidth;
int amount = (image.PixelWidth * 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.PixelHeight * rowWidth * 3;
Write(writer, fileHeader);
BmpInfoHeader infoHeader = new BmpInfoHeader();
infoHeader.HeaderSize = 40;
infoHeader.Height = image.PixelHeight;
infoHeader.Width = image.PixelWidth;
infoHeader.BitsPerPixel = 24;
infoHeader.Planes = 1;
infoHeader.Compression = BmpCompression.RGB;
infoHeader.ImageSize = image.PixelHeight * 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);
}
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 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);
}
