public void TestJpegLibraryEncode444()
{
var encoder = new JpegEncoder();
encoder.SetQuantizationTable(JpegStandardQuantizationTable.ScaleByQuality(JpegStandardQuantizationTable.GetLuminanceTable(JpegElementPrecision.Precision8Bit, 0), 75));
encoder.SetQuantizationTable(JpegStandardQuantizationTable.ScaleByQuality(JpegStandardQuantizationTable.GetChrominanceTable(JpegElementPrecision.Precision8Bit, 1), 75));
encoder.SetHuffmanTable(true, 0, JpegStandardHuffmanEncodingTable.GetLuminanceDCTable());
encoder.SetHuffmanTable(false, 0, JpegStandardHuffmanEncodingTable.GetLuminanceACTable());
encoder.SetHuffmanTable(true, 1, JpegStandardHuffmanEncodingTable.GetChrominanceDCTable());
encoder.SetHuffmanTable(false, 1, JpegStandardHuffmanEncodingTable.GetChrominanceACTable());
encoder.AddComponent(1, 0, 0, 0, 1, 1); // Y component
encoder.AddComponent(2, 1, 1, 1, 1, 1); // Cb component
encoder.AddComponent(3, 1, 1, 1, 1, 1); // Cr component
byte[] ycbcr = ArrayPool <byte> .Shared.Rent(3 *_width *_height);
try
{
JpegRgbToYCbCrConverter.Shared.ConvertRgba32ToYCbCr8(MemoryMarshal.AsBytes(_rgba.AsSpan()), ycbcr, _width * _height);
encoder.SetInputReader(new JpegBufferInputReader(_width, _height, 3, ycbcr));
using var bufferWriter = new NullBufferWriter();
encoder.SetOutput(bufferWriter);
encoder.Encode();
}
finally
{
ArrayPool <byte> .Shared.Return(ycbcr);
}
}
public static Task <int> Encode(FileInfo source, FileInfo output, int quality, bool optimizeCoding)
{
if (quality <= 0 || quality > 100)
{
throw new ArgumentOutOfRangeException(nameof(quality));
}
Image <Rgb24> image;
using (FileStream stream = source.OpenRead())
{
image = Image.Load <Rgb24>(stream);
}
// Convert RGB to YCbCr
byte[] ycbcr = new byte[image.Width * image.Height * 3];
for (int i = 0; i < image.Height; i++)
{
JpegRgbToYCbCrConverter.Shared.ConvertRgb24ToYCbCr8(MemoryMarshal.AsBytes(image.GetPixelRowSpan(i)), ycbcr.AsSpan(3 * image.Width * i, 3 * image.Width), image.Width);
}
var encoder = new JpegEncoder();
encoder.SetQuantizationTable(JpegStandardQuantizationTable.ScaleByQuality(JpegStandardQuantizationTable.GetLuminanceTable(JpegElementPrecision.Precision8Bit, 0), quality));
encoder.SetQuantizationTable(JpegStandardQuantizationTable.ScaleByQuality(JpegStandardQuantizationTable.GetChrominanceTable(JpegElementPrecision.Precision8Bit, 1), quality));
if (optimizeCoding)
{
encoder.SetHuffmanTable(true, 0);
encoder.SetHuffmanTable(false, 0);
encoder.SetHuffmanTable(true, 1);
encoder.SetHuffmanTable(false, 1);
}
else
{
encoder.SetHuffmanTable(true, 0, JpegStandardHuffmanEncodingTable.GetLuminanceDCTable());
encoder.SetHuffmanTable(false, 0, JpegStandardHuffmanEncodingTable.GetLuminanceACTable());
encoder.SetHuffmanTable(true, 1, JpegStandardHuffmanEncodingTable.GetChrominanceDCTable());
encoder.SetHuffmanTable(false, 1, JpegStandardHuffmanEncodingTable.GetChrominanceACTable());
}
encoder.AddComponent(0, 0, 0, 0, 1, 1); // Y component
encoder.AddComponent(1, 1, 1, 1, 2, 2); // Cb component
encoder.AddComponent(2, 1, 1, 1, 2, 2); // Cr component
encoder.SetInputReader(new JpegBufferInputReader(image.Width, image.Height, 3, ycbcr));
var writer = new ArrayBufferWriter <byte>();
encoder.SetOutput(writer);
encoder.Encode();
using (FileStream stream = output.OpenWrite())
{
stream.Write(writer.WrittenSpan);
}
return(Task.FromResult(0));
}
public void TestJpegLibraryEncode420_NoBuffer()
{
var encoder = new JpegEncoder();
encoder.SetQuantizationTable(JpegStandardQuantizationTable.ScaleByQuality(JpegStandardQuantizationTable.GetLuminanceTable(JpegElementPrecision.Precision8Bit, 0), 75));
encoder.SetQuantizationTable(JpegStandardQuantizationTable.ScaleByQuality(JpegStandardQuantizationTable.GetChrominanceTable(JpegElementPrecision.Precision8Bit, 1), 75));
encoder.SetHuffmanTable(true, 0, JpegStandardHuffmanEncodingTable.GetLuminanceDCTable());
encoder.SetHuffmanTable(false, 0, JpegStandardHuffmanEncodingTable.GetLuminanceACTable());
encoder.SetHuffmanTable(true, 1, JpegStandardHuffmanEncodingTable.GetChrominanceDCTable());
encoder.SetHuffmanTable(false, 1, JpegStandardHuffmanEncodingTable.GetChrominanceACTable());
encoder.AddComponent(1, 0, 0, 0, 1, 1); // Y component
encoder.AddComponent(2, 1, 1, 1, 2, 2); // Cb component
encoder.AddComponent(3, 1, 1, 1, 2, 2); // Cr component
encoder.SetInputReader(new JpegRgbaInputReader(_width, _height, _rgba));
using var bufferWriter = new NullBufferWriter();
encoder.SetOutput(bufferWriter);
encoder.Encode();
}