public void TestEncoding(Type pixelType, string filename, PictBpp bpp)
{
filename = "./input/" + filename;
bool match;
if (pixelType == typeof(Rgba32))
{
match = Compare <Rgba32>(filename, bpp);
}
else
{
match = Compare <Rgb48>(filename, bpp);
}
Assert.True(match, "Image did not match source");
}
private bool Compare <TPixel>(string filename, PictBpp bpp) where TPixel : unmanaged, IPixel <TPixel>
{
// Load the image
//using var sourceImage = Image<Rgba32>.Load<Rgba32>(filename);
var imageMagickDecoder = ImageMagickPictDecoder.Instance;
var outputPath = "./output/" + Path.GetFileNameWithoutExtension(filename);
var pictPath = $"{outputPath}_{bpp}.pict";
using var sourceImage = Image <TPixel> .Load <TPixel>(filename);
using var pictStream = new System.IO.MemoryStream();
var maxColors = ((byte)bpp >= 16 ? 256 : 1 << (int)bpp);
// Only use two colors, as PNG support palletised 1 and 2 bit images, whereas PICT doesn't
//var colors = new ReadOnlyMemory<Color>(new Color[] { Color.Black, Color.White });
//var quantizer = new PaletteQuantizer(colors, new QuantizerOptions { MaxColors = maxColors });
var quantizer = new WuQuantizer(new QuantizerOptions {
MaxColors = maxColors
});
var encoder = new PictEncoder()
{
PictBpp = bpp, Quantizer = quantizer
};
sourceImage.SaveAsPict(pictPath, encoder);
PngBitDepth pngBpp;
PngColorType pngColorType;
switch (bpp)
{
case PictBpp.Bit1:
pngBpp = PngBitDepth.Bit1;
pngColorType = PngColorType.Palette;
break;
case PictBpp.Bit2:
pngBpp = PngBitDepth.Bit2;
pngColorType = PngColorType.Palette;
break;
case PictBpp.Bit4:
pngBpp = PngBitDepth.Bit4;
pngColorType = PngColorType.Palette;
break;
case PictBpp.Bit8:
pngBpp = PngBitDepth.Bit8;
pngColorType = PngColorType.Palette;
break;
default:
pngBpp = PngBitDepth.Bit8;
pngColorType = PngColorType.Rgb;
break;
}
// For reference, also write out a PNG version
sourceImage.SaveAsPng($"{outputPath}_{bpp}.png", new SixLabors.ImageSharp.Formats.Png.PngEncoder()
{
BitDepth = pngBpp, ColorType = pngColorType, Quantizer = quantizer
});
// Get the quantized version to compare
using var pngVersion = Image.Load <TPixel>($"{outputPath}_{bpp}.png");
// Reload the image in ImageMagik to to compare
using var imageMagickImage = imageMagickDecoder.ReadPict <TPixel>(SixLabors.ImageSharp.Configuration.Default, pictPath);
bool match = true;
// very stupid compare
for (int y = 0; y < pngVersion.Height; y++)
{
var sourceSpan = pngVersion.GetPixelRowSpan(y);
var magickSpan = imageMagickImage.GetPixelRowSpan(y);
for (int x = 0; x < sourceSpan.Length; x++)
{
if (sourceSpan[x].ToScaledVector4() != magickSpan[x].ToScaledVector4())
{
match = false;
break;
}
}
if (match == false)
{
break;
}
}
return(match);
}
