/// <summary>
/// Writes the image data into the stream in the given format.
/// </summary>
/// <param name="image">The image whose data to write.</param>
/// <param name="stream">The stream into which to write the data.</param>
/// <param name="type">The type of Netpbm image according to which to encode the data.</param>
/// <typeparam name="TPixelComponent">The type of pixel component values.</typeparam>
public void WriteImageData <TPixelComponent>(NetpbmImage <TPixelComponent> image, Stream stream, ImageType type)
{
// check if the format is supported
var supportedTypes = SupportedTypesForImage(image);
if (!supportedTypes.Contains(type))
{
throw new ArgumentOutOfRangeException("type", type, "the image cannot be encoded into this type");
}
using (var writer = new NetpbmBinaryWriter(stream, new UTF8Encoding(false, true), leaveOpen: true))
{
bool isPlain;
switch (type)
{
case ImageType.PBM:
case ImageType.PGM:
case ImageType.PPM:
case ImageType.PAM:
case ImageType.BigPAM:
isPlain = false;
break;
case ImageType.PlainPBM:
case ImageType.PlainPGM:
case ImageType.PlainPPM:
isPlain = true;
break;
default:
throw new ArgumentOutOfRangeException("type", type, "unknown image type");
}
if (isPlain)
{
// output in row-major order as decimal numbers
// add newlines after each row to make things nicer
foreach (var row in image.NativeRows)
{
foreach (var value in row)
{
writer.WriteUnprefixed(value.ToString());
writer.Write(' ');
}
writer.Write('\n');
}
}
else if (type == ImageType.PBM)
{
// special case: bit-packed format!
var values = new List <TPixelComponent>(8);
foreach (var row in image.NativeRows)
{
foreach (var value in row)
{
values.Add(value);
if (values.Count == 8)
{
byte theByte = EncodeBitmapValuesIntoByte(image, values);
writer.Write(theByte);
values.Clear();
}
}
if (values.Count != 0)
{
byte theByte = EncodeBitmapValuesIntoByte(image, values);
writer.Write(theByte);
}
}
}
else
{
// just the big endian bytes
foreach (var row in image.NativeRows)
{
foreach (var value in row)
{
writer.Write(image.ComponentToBigEndianBytes(value).ToArray());
}
}
}
}
}
/// <summary>
/// Writes a row of image data into the stream in the given format.
/// </summary>
/// <param name="image">The image whose row is being encoded (for formatting purposes).</param>
/// <param name="row">The row to write.</param>
/// <param name="stream">The stream to write into.</param>
/// <param name="type">The format according to which to write.</param>
public void WriteImageRow <TPixelComponent>(NetpbmImage <TPixelComponent> image, IEnumerable <TPixelComponent> row, Stream stream, ImageType type)
{
using (var writer = new NetpbmBinaryWriter(stream, new UTF8Encoding(false, true), leaveOpen: true))
{
bool isPlain;
switch (type)
{
case ImageType.PBM:
case ImageType.PGM:
case ImageType.PPM:
case ImageType.PAM:
case ImageType.BigPAM:
isPlain = false;
break;
case ImageType.PlainPBM:
case ImageType.PlainPGM:
case ImageType.PlainPPM:
isPlain = true;
break;
default:
throw new ArgumentOutOfRangeException("type", type, "unknown image type");
}
if (isPlain)
{
// output row as decimal numbers
// add a newline after the row to make things nicer
foreach (var value in row)
{
writer.WriteUnprefixed(value.ToString());
writer.Write(' ');
}
writer.Write('\n');
}
else if (type == ImageType.PBM)
{
// special case: bit-packed format!
var values = new List <TPixelComponent>(8);
foreach (var value in row)
{
values.Add(value);
if (values.Count == 8)
{
byte theByte = EncodeBitmapValuesIntoByte(image, values);
writer.Write(theByte);
values.Clear();
}
}
if (values.Count != 0)
{
byte theByte = EncodeBitmapValuesIntoByte(image, values);
writer.Write(theByte);
}
}
else
{
// just the big endian bytes
foreach (var value in row)
{
writer.Write(image.ComponentToBigEndianBytes(value).ToArray());
}
}
}
}
/// <summary>
/// Writes the image header into the stream in the given format.
/// </summary>
/// <param name="header">The image header to write.</param>
/// <param name="stream">The stream into which to write the header.</param>
/// <param name="type">The type of Netpbm image according to which to encode the header.</param>
/// <typeparam name="TPixelComponent">The type of pixel component values.</typeparam>
public void WriteImageHeader <TPixelComponent>(NetpbmHeader <TPixelComponent> header, Stream stream, ImageType type)
{
// check if the format is supported
var supportedTypes = SupportedTypesForHeader(header);
if (!supportedTypes.Contains(type))
{
throw new ArgumentOutOfRangeException("type", type, "the image cannot be encoded into this type");
}
using (var writer = new NetpbmBinaryWriter(stream, new UTF8Encoding(false, true), leaveOpen: true))
{
int magicNumber = (int)type;
switch (type)
{
case ImageType.PBM:
case ImageType.PGM:
case ImageType.PPM:
case ImageType.PAM:
case ImageType.PlainPBM:
case ImageType.PlainPGM:
case ImageType.PlainPPM:
break;
case ImageType.BigPAM:
magicNumber = (int)ImageType.PAM;
break;
default:
throw new ArgumentOutOfRangeException("type", type, "unknown image type");
}
// output the magic
writer.WriteUnprefixed("P{0}\n", magicNumber);
if (type == ImageType.PAM || type == ImageType.BigPAM)
{
// output width line
writer.WriteUnprefixed("WIDTH {0}\n", header.Width);
// output height line
writer.WriteUnprefixed("HEIGHT {0}\n", header.Height);
// output number of components
writer.WriteUnprefixed("DEPTH {0}\n", header.Components.Count);
// maximum value
writer.WriteUnprefixed("MAXVAL {0}\n", header.HighestComponentValue);
// find the components we are working with
writer.WriteUnprefixed("TUPLTYPE {0}\n", GetPamTupleType(header));
writer.WriteUnprefixed("ENDHDR\n");
}
else
{
// output width and height
writer.WriteUnprefixed("{0} {1}\n", header.Width, header.Height);
// unless PBM (where the max value is always 1)
if (type != ImageType.PBM && type != ImageType.PlainPBM)
{
// output the max value
writer.WriteUnprefixed("{0}\n", header.HighestComponentValue);
}
// the header's final newline
writer.Write('\n');
}
}
}
