public void FromPixel(Pixel pixel)
{
pixel = Numeric.Clamp(pixel, Pixel.Zero, Pixel.One) * Max;
this.R = (ushort)MathF.Round(pixel.R);
this.G = (ushort)MathF.Round(pixel.G);
this.B = (ushort)MathF.Round(pixel.B);
}
public void FromPixel(Pixel pixel)
{
pixel = Numeric.Clamp(pixel, Pixel.Zero, Pixel.One);
this.R = pixel.R;
this.G = pixel.G;
this.B = pixel.B;
this.A = pixel.A;
}
private static ushort Pack(ref Pixel pixel)
{
pixel = Numeric.Clamp(pixel, Pixel.Zero, Pixel.One);
return((ushort)((((int)Math.Round(pixel.A * 15F) & 0x0F) << 12)
| (((int)Math.Round(pixel.R * 15F) & 0x0F) << 8)
| (((int)Math.Round(pixel.G * 15F) & 0x0F) << 4)
| ((int)Math.Round(pixel.B * 15F) & 0x0F)));
}
public Rgba64(Vector4 vector)
{
vector = Numeric.Clamp(vector, Vector4.Zero, Vector4.One) * Max;
this.R = (ushort)MathF.Round(vector.X);
this.G = (ushort)MathF.Round(vector.Y);
this.B = (ushort)MathF.Round(vector.Z);
this.A = (ushort)MathF.Round(vector.W);
}
/// <summary>
/// Writes an 8bit lookup table
/// </summary>
/// <param name="value">The LUT to write</param>
/// <returns>The number of bytes written</returns>
public int WriteLut8(IccLut value)
{
foreach (float item in value.Values)
{
this.WriteByte((byte)Numeric.Clamp((item * byte.MaxValue) + 0.5F, 0, byte.MaxValue));
}
return(value.Values.Length);
}
/// <summary>
/// Writes an 16bit lookup table
/// </summary>
/// <param name="value">The LUT to write</param>
/// <returns>The number of bytes written</returns>
public int WriteLut16(IccLut value)
{
foreach (float item in value.Values)
{
this.WriteUInt16((ushort)Numeric.Clamp((item * ushort.MaxValue) + 0.5F, 0, ushort.MaxValue));
}
return(value.Values.Length * 2);
}
private static ushort Pack(ref Pixel pixel)
{
pixel = Numeric.Clamp(pixel, Pixel.Zero, Pixel.One);
return((ushort)(
(((int)Math.Round(pixel.R * 31F) & 0x1F) << 10)
| (((int)Math.Round(pixel.G * 31F) & 0x1F) << 5)
| (((int)Math.Round(pixel.B * 31F) & 0x1F) << 0)
| (((int)Math.Round(pixel.A) & 0x1) << 15)));
}
private static uint Pack(ref Pixel pixel)
{
pixel = Numeric.Clamp(pixel, Pixel.Zero, Pixel.One) * Multiplier;
return((uint)(
(((int)Math.Round(pixel.R) & 0x03FF) << 0)
| (((int)Math.Round(pixel.G) & 0x03FF) << 10)
| (((int)Math.Round(pixel.B) & 0x03FF) << 20)
| (((int)Math.Round(pixel.A) & 0x03) << 30)));
}
private void Pack(ref Pixel pixel)
{
pixel *= MaxBytes;
pixel += Half;
pixel = Numeric.Clamp(pixel, Pixel.Zero, MaxBytes);
this.R = (byte)pixel.R;
this.G = (byte)pixel.G;
this.B = (byte)pixel.B;
}
/// <summary>
/// Writes an unsigned 32bit number with 16 value bits and 16 fractional bits
/// </summary>
/// <param name="value">The value to write</param>
/// <returns>the number of bytes written</returns>
public int WriteUFix16(double value)
{
const double Max = ushort.MaxValue + (65535d / 65536d);
const double Min = ushort.MinValue;
value = Numeric.Clamp(value, Min, Max);
value *= 65536d;
return(this.WriteUInt32((uint)Math.Round(value, MidpointRounding.AwayFromZero)));
}
/// <summary>
/// Writes an unsigned 16bit number with 1 value bit and 15 fractional bits
/// </summary>
/// <param name="value">The value to write</param>
/// <returns>the number of bytes written</returns>
public int WriteU1Fix15(double value)
{
const double Max = 1 + (32767d / 32768d);
const double Min = 0;
value = Numeric.Clamp(value, Min, Max);
value *= 32768d;
return(this.WriteUInt16((ushort)Math.Round(value, MidpointRounding.AwayFromZero)));
}
/// <summary>
/// Writes an unsigned 16bit number with 8 value bits and 8 fractional bits
/// </summary>
/// <param name="value">The value to write</param>
/// <returns>the number of bytes written</returns>
public int WriteUFix8(double value)
{
const double Max = byte.MaxValue + (255d / 256d);
const double Min = byte.MinValue;
value = Numeric.Clamp(value, Min, Max);
value *= 256d;
return(this.WriteUInt16((ushort)Math.Round(value, MidpointRounding.AwayFromZero)));
}
private static uint Pack(ref Pixel pixel)
{
var vec = Numeric.Clamp(pixel, MinusOne, Pixel.One) * Half;
uint byte4 = ((uint)MathF.Round(vec.R) & 0xFF) << 0;
uint byte3 = ((uint)MathF.Round(vec.G) & 0xFF) << 8;
uint byte2 = ((uint)MathF.Round(vec.B) & 0xFF) << 16;
uint byte1 = ((uint)MathF.Round(vec.A) & 0xFF) << 24;
return(byte4 | byte3 | byte2 | byte1);
}
private static ulong Pack(ref Pixel pixel)
{
pixel = Numeric.Clamp(pixel, Min, Max);
// Clamp the value between min and max values
ulong word4 = ((ulong)Math.Round(pixel.R) & 0xFFFF) << 0x00;
ulong word3 = ((ulong)Math.Round(pixel.G) & 0xFFFF) << 0x10;
ulong word2 = ((ulong)Math.Round(pixel.B) & 0xFFFF) << 0x20;
ulong word1 = ((ulong)Math.Round(pixel.A) & 0xFFFF) << 0x30;
return(word4 | word3 | word2 | word1);
}
private static ulong Pack(ref Pixel pixel)
{
pixel *= Max;
pixel = Numeric.Clamp(pixel, Min, Max);
// Round rather than truncate.
ulong word4 = ((ulong)MathF.Round(pixel.R) & 0xFFFF) << 0x00;
ulong word3 = ((ulong)MathF.Round(pixel.G) & 0xFFFF) << 0x10;
ulong word2 = ((ulong)MathF.Round(pixel.B) & 0xFFFF) << 0x20;
ulong word1 = ((ulong)MathF.Round(pixel.A) & 0xFFFF) << 0x30;
return(word4 | word3 | word2 | word1);
}
/// <summary>
/// Writes a 16bit color lookup table
/// </summary>
/// <param name="value">The CLUT to write</param>
/// <returns>The number of bytes written</returns>
public int WriteClut16(IccClut value)
{
int count = 0;
foreach (float[] inArray in value.Values)
{
foreach (float item in inArray)
{
count += this.WriteUInt16((ushort)Numeric.Clamp((item * ushort.MaxValue) + 0.5F, 0, ushort.MaxValue));
}
}
return(count);
}
/// <summary>
/// Writes a 8bit color lookup table
/// </summary>
/// <param name="value">The CLUT to write</param>
/// <returns>The number of bytes written</returns>
public int WriteClut8(IccClut value)
{
int count = 0;
foreach (float[] inArray in value.Values)
{
foreach (float item in inArray)
{
count += this.WriteByte((byte)Numeric.Clamp((item * byte.MaxValue) + 0.5F, 0, byte.MaxValue));
}
}
return(count);
}
private static uint Pack(ref Pixel pixel)
{
const float Max = 255F;
// Clamp the value between min and max values
pixel = Numeric.Clamp(pixel, Pixel.Zero, new Pixel(Max));
uint byte4 = (uint)Math.Round(pixel.R) & 0xFF;
uint byte3 = ((uint)Math.Round(pixel.G) & 0xFF) << 0x8;
uint byte2 = ((uint)Math.Round(pixel.B) & 0xFF) << 0x10;
uint byte1 = ((uint)Math.Round(pixel.A) & 0xFF) << 0x18;
return(byte4 | byte3 | byte2 | byte1);
}
/// <summary>
/// Level shift by +maximum/2, clip to [0, maximum]
/// </summary>
public void NormalizeColorsInPlace(float maximum)
{
var CMin4 = new Vector4(0F);
var CMax4 = new Vector4(maximum);
var COff4 = new Vector4(MathF.Ceiling(maximum / 2));
this.V0L = Numeric.Clamp(this.V0L + COff4, CMin4, CMax4);
this.V0R = Numeric.Clamp(this.V0R + COff4, CMin4, CMax4);
this.V1L = Numeric.Clamp(this.V1L + COff4, CMin4, CMax4);
this.V1R = Numeric.Clamp(this.V1R + COff4, CMin4, CMax4);
this.V2L = Numeric.Clamp(this.V2L + COff4, CMin4, CMax4);
this.V2R = Numeric.Clamp(this.V2R + COff4, CMin4, CMax4);
this.V3L = Numeric.Clamp(this.V3L + COff4, CMin4, CMax4);
this.V3R = Numeric.Clamp(this.V3R + COff4, CMin4, CMax4);
this.V4L = Numeric.Clamp(this.V4L + COff4, CMin4, CMax4);
this.V4R = Numeric.Clamp(this.V4R + COff4, CMin4, CMax4);
this.V5L = Numeric.Clamp(this.V5L + COff4, CMin4, CMax4);
this.V5R = Numeric.Clamp(this.V5R + COff4, CMin4, CMax4);
this.V6L = Numeric.Clamp(this.V6L + COff4, CMin4, CMax4);
this.V6R = Numeric.Clamp(this.V6R + COff4, CMin4, CMax4);
this.V7L = Numeric.Clamp(this.V7L + COff4, CMin4, CMax4);
this.V7R = Numeric.Clamp(this.V7R + COff4, CMin4, CMax4);
}
internal static Vector4 PseudoRound(this Vector4 v)
{
Vector4 sign = Numeric.Clamp(v, new Vector4(-1), new Vector4(1));
return(v + (sign * 0.5f));
}
/// <summary>
/// Encode writes the image to the jpeg baseline format with the given options.
/// </summary>
/// <param name="image">The image to write from.</param>
/// <param name="stream">The stream to write to.</param>
/// <param name="cancellationToken">The token to request cancellation.</param>
public void Encode(Buffer2D <Pixel> image, ImageMetadata metadata, Stream stream, CancellationToken cancellationToken)
{
//Guard.NotNull(image, nameof(image));
//Guard.NotNull(stream, nameof(stream));
cancellationToken.ThrowIfCancellationRequested();
const ushort max = JpegConstants.MaxLength;
if (image.Width >= max || image.Height >= max)
{
throw new ImageFormatException($"Image is too large to encode at {image.Width}x{image.Height}.");
}
this.outputStream = stream;
// System.Drawing produces identical output for jpegs with a quality parameter of 0 and 1.
int qlty = Numeric.Clamp(this.quality ?? metadata.GetFormatMetadata(new JpegFormat()).Quality, 1, 100);
this.subsample ??= qlty >= 91 ? JpegSubsample.Ratio444 : JpegSubsample.Ratio420;
// Convert from a quality rating to a scaling factor.
int scale;
if (qlty < 50)
{
scale = 5000 / qlty;
}
else
{
scale = 200 - (qlty * 2);
}
// Initialize the quantization tables.
InitQuantizationTable(0, scale, ref this.luminanceQuantTable);
InitQuantizationTable(1, scale, ref this.chrominanceQuantTable);
// Compute number of components based on input image type.
const int componentCount = 3;
// Write the Start Of Image marker.
this.WriteApplicationHeader(metadata);
// Write Exif, ICC and IPTC profiles
this.WriteProfiles(metadata);
// Write the quantization tables.
this.WriteDefineQuantizationTables();
// Write the image dimensions.
this.WriteStartOfFrame(image.Width, image.Height, componentCount);
// Write the Huffman tables.
this.WriteDefineHuffmanTables(componentCount);
// Write the image data.
this.WriteStartOfScan(image, cancellationToken);
// Write the End Of Image marker.
this.buffer[0] = JpegConstants.Markers.XFF;
this.buffer[1] = JpegConstants.Markers.EOI;
stream.Write(this.buffer, 0, 2);
stream.Flush();
}
/// <summary>
/// Sets the reading position to the given value
/// </summary>
/// <param name="index">The new index position</param>
public void SetIndex(int index)
{
this.currentIndex = Numeric.Clamp(index, 0, this.data.Length);
}
