private static void WritePixels(BinaryWriter writer, TGAEncoding type, Color[] pixels, int depth, int width, int height, bool palette)
{
if (EncodingUsesRLEOrCmp(type))
{
throw new NotImplementedException();
}
else
{
WritePixelData(writer, pixels, depth, width, height, palette);
}
}
private static void WriteIndices(BinaryWriter writer, byte[] indices, int width, int height, TGAEncoding type, int bpp)
{
if (EncodingUsesRLEOrCmp(type))
{
throw new NotImplementedException();
}
else
{
WriteIndicesData(writer, bpp, width, height, indices);
}
}
private static Color[] ReadPixels(BinaryReader reader, TGAEncoding type, int bpp, int width, int height)
{
byte[] pixelData = reader.ReadBytes((int)((width * height) * ((float)bpp / 8)));
if (EncodingUsesRLEOrCmp(type))
{
TGADataDecoder decoder = GetDecoder(type);
throw new NotImplementedException();
}
else
{
return DecodeUncompressedPixelDataToColors(pixelData, bpp, width, height, false);
}
}
private static bool IsIndexedEncoding(TGAEncoding encoding)
{
switch (encoding)
{
case TGAEncoding.Indexed:
case TGAEncoding.IndexedRLE:
case TGAEncoding.IndexedHDRLE:
case TGAEncoding.IndexedHDRLEQ:
return true;
default:
return false;
}
}
private static byte[] ReadIndices(BinaryReader reader, TGAEncoding type, int bpp, int width, int height)
{
byte[] indices = reader.ReadBytes((int)((width * height) * ((float)bpp / 8)));
if (EncodingUsesRLEOrCmp(type))
{
TGADataDecoder decoder = GetDecoder(type);
throw new NotImplementedException();
}
else
{
indices = DecodeUncompressedIndexDataTo8Bit(indices, bpp, width, height);
}
return indices;
}
// set header info on creation
private void SetHeaderInfo(int w, int h, int bpp, int palDepth, TGAEncoding enc)
{
// check if the encoding uses rle or compression and throw an exception if it does
if (EncodingUsesRLEOrCmp(enc))
{
throw new NotImplementedException("Encodings using RLE encoding or compression are not supported.");
}
else if (enc == TGAEncoding.Grayscale)
{
throw new NotImplementedException("Grayscale encoding is not supported.");
}
bool isIndexed = IsIndexedEncoding(enc);
_idLength = 0;
_colorMapType = isIndexed ? (byte)1 : (byte)0;
_dataType = enc;
if (isIndexed)
{
_paletteStartIndex = 0;
_paletteLength = (short)(1 << bpp);
_paletteDepth = (byte)palDepth;
}
_xOrigin = 0;
_yOrigin = 0;
_width = (short)w;
_height = (short)h;
_bpp = (byte)bpp;
_imageDescriptor = 0;
}
// encoding type checking helpers
private static bool EncodingUsesRLEOrCmp(TGAEncoding type)
{
switch (type)
{
case TGAEncoding.IndexedRLE:
case TGAEncoding.RGBRLE:
case TGAEncoding.GrayScaleCmp:
case TGAEncoding.IndexedHDRLE:
case TGAEncoding.IndexedHDRLEQ:
return true;
default:
return false;
}
}
private static TGADataEncoder GetEncoder(TGAEncoding type)
{
switch (type)
{
case TGAEncoding.IndexedRLE:
case TGAEncoding.RGBRLE:
case TGAEncoding.GrayScaleCmp:
case TGAEncoding.IndexedHDRLE:
case TGAEncoding.IndexedHDRLEQ:
throw new NotImplementedException($"Encoder for data type: {type} is not implemented.");
default:
throw new ArgumentException($"Data type: {type} is not encoded.");
}
}
internal void InternalRead(BinaryReader reader)
{
_idLength = reader.ReadByte();
_colorMapType = reader.ReadByte();
_dataType = (TGAEncoding)reader.ReadByte();
_paletteStartIndex = reader.ReadInt16();
_paletteLength = reader.ReadInt16();
_paletteDepth = reader.ReadByte();
_xOrigin = reader.ReadInt16();
_yOrigin = reader.ReadInt16();
_width = reader.ReadInt16();
_height = reader.ReadInt16();
_bpp = reader.ReadByte();
_imageDescriptor = reader.ReadByte();
// format check
if (EncodingUsesRLEOrCmp(_dataType) || _dataType == TGAEncoding.Grayscale)
{
throw new NotImplementedException($"Data type not supported: {_dataType}");
}
else if (_dataType == TGAEncoding.None)
{
return;
}
// skip user data
reader.Seek(_idLength, SeekOrigin.Current);
if (IsIndexed)
{
// read palette and indices
_palette = ReadPalette(reader, _paletteLength, _bpp, _paletteDepth);
_paletteIndices = ReadIndices(reader, _dataType, _bpp, _width, _height);
}
else
{
// read pixels
_pixels = ReadPixels(reader, _dataType, _bpp, _width, _height);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TGAFile"/> class from specified dimensions, color palette, pixel indices and encoding parameters that suit the provided image data.
/// </summary>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="palette">The color palette of the image</param>
/// <param name="pixelIndices">The per-pixel palette color indices of the image.</param>
/// <param name="encodingType">Specifies the pixel data encoding to use.</param>
/// <param name="bitsPerPixel">Specifies the amount of bits per pixel.
/// 4 and 8 are reserved for indexed encodings, while 16, 24 and 32 are used for non-indexed images.</param>
/// <param name="paletteDepth">Specifies the amount of bits per color in the palette. Ignored if the encoding type is of an indexed encoding.</param>
public TGAFile(int width, int height, Color[] palette, byte[] pixelIndices,
TGAEncoding encodingType = TGAEncoding.Indexed, int bitsPerPixel = 8, int paletteDepth = 32)
{
// set header
SetHeaderInfo(width, height, bitsPerPixel, paletteDepth, encodingType);
// done if the encoding type is set to none
if (encodingType == TGAEncoding.None)
return;
/*
// check if input data is correct
if (_palette.Length != _paletteLength || (width * height * (float)(bitsPerPixel / 8)) != pixelIndices.Length)
{
throw new ArgumentException("Palette or pixel index data was not in the expected format");
}
*/
// should probably throw a format exception somewhere as this is pretty insane ;p
if (IsIndexed)
{
if (palette.Length != (1 << bitsPerPixel))
{
BitmapHelper.QuantizeBitmap(BitmapHelper.Create(palette, pixelIndices, width, height), 1 << bitsPerPixel, out _paletteIndices, out _palette);
}
else
{
// set palette and pixel data
_palette = palette;
_paletteIndices = pixelIndices;
}
}
else
{
_pixels = BitmapHelper.GetColors(BitmapHelper.Create(palette, pixelIndices, width, height));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TGAFile"/> class from the specified <see cref="Bitmap"/> class, and encoding parameters to encode the bitmap with.
/// </summary>
/// <param name="bitmap">The bitmap instance used for encoding.</param>
/// <param name="encodingType">Specifies the pixel data encoding to use.</param>
/// <param name="bitsPerPixel">Specifies the amount of bits per pixel.
/// 4 and 8 are reserved for indexed encodings, while 16, 24 and 32 are used for non-indexed images.</param>
/// <param name="paletteDepth">Specifies the amount of bits per color in the palette. Ignored if the encoding type is of an indexed encoding.</param>
public TGAFile(Bitmap bitmap, TGAEncoding encodingType = TGAEncoding.Indexed, int bitsPerPixel = 8, int paletteDepth = 32)
{
// set header
SetHeaderInfo(bitmap.Width, bitmap.Height, bitsPerPixel, paletteDepth, encodingType);
// done if the encoding type is set to none
if (encodingType == TGAEncoding.None)
return;
// set bitmap data
if (IsIndexed)
{
BitmapHelper.QuantizeBitmap(bitmap, 1 << bitsPerPixel, out _paletteIndices, out _palette);
}
else
{
_pixels = BitmapHelper.GetColors(bitmap);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TGAFile"/> class from the specified bitmap file path, and encoding parameters to encode the bitmap with.
/// </summary>
/// <param name="filename">The bitmap file path used for encoding.</param>
/// <param name="encodingType">Specifies the pixel data encoding to use.</param>
/// <param name="bitsPerPixel">Specifies the amount of bits per pixel.
/// 4 and 8 are reserved for indexed encodings, while 16, 24 and 32 are used for non-indexed images.</param>
/// <param name="paletteDepth">Specifies the amount of bits per color in the palette. Ignored if the encoding type is of an indexed encoding.</param>
public TGAFile(string filename, TGAEncoding encodingType = TGAEncoding.Indexed, int bitsPerPixel = 8, int paletteDepth = 32)
: this(new Bitmap(filename), encodingType, bitsPerPixel, paletteDepth)
{
}