public ImageDecoderIndexed(byte[] pixelData, int width, int height, IndexCodec codec, SKColor[] palette = null, ImageFilter imageFilter = null, PaletteFilter paletteFilter = null)
{
this.pixelData = pixelData;
if (imageFilter != null)
{
this.pixelData = imageFilter.Defilter(pixelData);
}
this.width = width;
this.height = height;
this.indexCodec = codec;
grayScale = new SKColor[1 << codec.BitDepth];
for (int i = 0; i < grayScale.Length; i++)
{
grayScale[i] = new SKColor((byte)(i * (256 / grayScale.Length)), (byte)(i * (256 / grayScale.Length)), (byte)(i * (256 / grayScale.Length)));
}
if (paletteFilter != null && palette != null)
{
Palette = paletteFilter.Defilter(palette);
}
else if (palette == null)
{
palette = (SKColor[])grayScale.Clone();
Palette = palette;
}
else
{
Palette = (SKColor[])palette.Clone();
}
}
private void Init(IndexCodec codec, IComparer <Color> pixelComparer, ColorCodec encoder, ImageFilter imageFilter, PaletteFilter paletteFilter)
{
this.codec = codec;
this.colorEncoder = encoder;
this.imageFilter = imageFilter;
this.paletteFilter = paletteFilter;
colors = 1 << codec.BitDepth;
if (pixelComparer != null)
{
pixelSorter = pixelComparer;
}
}
public ImageEncoderIndexed(IList <Color[]> palettes, Image referenceImage, IndexCodec codec, ColorCodec encoder = null, ImageFilter imageFilter = null, PaletteFilter paletteFilter = null)
{
fromReference = true;
Palettes = palettes;
this.referenceImage = referenceImage;
width = referenceImage.Width;
height = referenceImage.Height;
if (!IsGreyScale(referenceImage))
{
throw new ArgumentException("The reference image must be in grey scale!");
}
Init(codec, null, encoder, imageFilter, paletteFilter);
}
private ImageEncoderIndexed(IList <Image> images, IndexCodec codec, IComparer <Color> pixelComparer = null, ColorCodec encoder = null, ImageFilter imageFilter = null, PaletteFilter paletteFilter = null)
{
fromReference = false;
if (images.Count == 0)
{
throw new ArgumentException("The image list cannot be empty!");
}
width = images.First().Width;
height = images.First().Height;
foreach (Image img in images)
{
if (img.Width != width || img.Height != height)
{
throw new ArgumentException("The images are not of the same size!");
}
}
this.images = images;
Init(codec, pixelComparer, encoder, imageFilter, paletteFilter);
}
public ImageEncoderIndexed(Image image, IndexCodec codec, IComparer <Color> pixelComparer = null, ColorCodec encoder = null, ImageFilter imageFilter = null, PaletteFilter paletteFilter = null)
: this(new List <Image>() { image }, codec, pixelComparer, encoder, imageFilter, paletteFilter)
{
}
