/// <summary>
/// Updates the ARGB, HSL and HSB color to represent the CMYK current color.
/// <para>This SHOULD be called after changing any values of the CMYK color</para>
/// </summary>
public void UpdateCMYK()
{
this.ARGB = CMYK;
this.HSL = CMYK;
this.HSB = CMYK;
this.a = CMYK.A;
}
/// <summary>
/// Updates the ARGB, HSB and CMYK color to represent the HSL current color.
/// <para>This SHOULD be called after changing any values of the HSL color</para>
/// </summary>
public void UpdateHSL()
{
this.ARGB = HSL;
this.HSB = HSL;
this.CMYK = HSL;
this.a = HSL.A;
}
/// <summary>
/// Updates the ARGB, HSL and CMYK color to represent the HSB current color.
/// <para>This SHOULD be called after changing any values of the HSB color</para>
/// </summary>
public void UpdateHSB()
{
this.ARGB = HSB;
this.HSL = HSB;
this.CMYK = HSB;
this.a = HSB.A;
}
/// <summary>
/// Creates a new instnace of the COLOR struct from the given System.Drawing.Color.
/// </summary>
/// <param name="color">A System.Drawing.Color color.</param>
public COLOR(Color color)
{
ARGB = color;
HSB = color;
HSL = color;
CMYK = color;
a = color.A;
}
// https://www.cyotek.com/blog/reading-photoshop-color-swatch-aco-files-using-csharp
private static List <Color> ReadSwatches(Stream stream, FileVersion version)
{
int colorCount;
List <Color> results;
results = new List <Color>();
// read the number of colors, which also occupies two bytes
colorCount = ByteHelper.ReadInt16BE(stream);
for (int i = 0; i < colorCount; i++)
{
ColorSpace colorSpace;
int value1;
int value2;
int value3;
int value4;
// again, two bytes for the color space
colorSpace = (ColorSpace)(ByteHelper.ReadInt16BE(stream));
value1 = ByteHelper.ReadInt16BE(stream);
value2 = ByteHelper.ReadInt16BE(stream);
value3 = ByteHelper.ReadInt16BE(stream);
value4 = ByteHelper.ReadInt16BE(stream);
if (version == FileVersion.Version2)
{
int length;
// need to read the name even though currently our colour collection doesn't support names
length = ByteHelper.ReadInt32BE(stream);
Helper.ReadString(stream, length);
}
switch (colorSpace)
{
case ColorSpace.Rgb:
int red;
int green;
int blue;
// RGB.
// The first three values in the color data are red , green , and blue . They are full unsigned
// 16-bit values as in Apple's RGBColor data structure. Pure red = 65535, 0, 0.
red = value1 / 256; // 0-255
green = value2 / 256; // 0-255
blue = value3 / 256; // 0-255
results.Add(ARGB.FromARGB(red.ToByte(), green.ToByte(), blue.ToByte()));
break;
case ColorSpace.Hsb:
float hue;
float saturation;
float brightness;
// HSB.
// The first three values in the color data are hue , saturation , and brightness . They are full
// unsigned 16-bit values as in Apple's HSVColor data structure. Pure red = 0,65535, 65535.
hue = value1 / 182.04f; // 0-359
saturation = value2 / 655.35f; // 0-100
brightness = value3 / 655.35f; // 0-100
results.Add(new HSB(hue, saturation, brightness).ToColor());
break;
case ColorSpace.Grayscale:
int gray;
// Grayscale.
// The first value in the color data is the gray value, from 0...10000.
gray = (int)(value1 / 39.0625); // 0-255
results.Add(ARGB.FromARGB(gray.ToByte(), gray.ToByte(), gray.ToByte()));
break;
default:
throw new InvalidDataException(string.Format("Color space '{0}' not supported.", colorSpace));
}
}
return(results);
}
// https://www.cyotek.com/blog/loading-the-color-palette-from-a-bbm-lbm-image-file-using-csharp#files
public static List <Color> ReadColorMap(string fileName)
{
List <Color> colorPalette;
colorPalette = new List <Color>();
using (FileStream stream = File.OpenRead(fileName))
{
byte[] buffer;
string header;
// read the FORM header that identifies the document as an IFF file
buffer = new byte[4];
stream.Read(buffer, 0, buffer.Length);
if (Encoding.ASCII.GetString(buffer) != "FORM")
{
throw new InvalidDataException("Form header not found.");
}
// the next value is the size of all the data in the FORM chunk
// We don't actually need this value, but we have to read it
// regardless to advance the stream
ByteHelper.ReadInt32BE(stream);
// read either the PBM or ILBM header that identifies this document as an image file
stream.Read(buffer, 0, buffer.Length);
header = Encoding.ASCII.GetString(buffer);
if (header != "PBM " && header != "ILBM")
{
throw new InvalidDataException("Bitmap header not found.");
}
while (stream.Read(buffer, 0, buffer.Length) == buffer.Length)
{
int chunkLength;
chunkLength = ByteHelper.ReadInt32BE(stream);
if (Encoding.ASCII.GetString(buffer) != "CMAP")
{
// some other LBM chunk, skip it
if (stream.CanSeek)
{
stream.Seek(chunkLength, SeekOrigin.Current);
}
else
{
for (int i = 0; i < chunkLength; i++)
{
stream.ReadByte();
}
}
}
else
{
// color map chunk!
for (int i = 0; i < chunkLength / 3; i++)
{
int r;
int g;
int b;
r = stream.ReadByte();
g = stream.ReadByte();
b = stream.ReadByte();
colorPalette.Add(ARGB.FromARGB(255, r.ToByte(), g.ToByte(), b.ToByte()));
}
// all done so stop reading the rest of the file
break;
}
// chunks always contain an even number of bytes even if the recorded length is odd
// if the length is odd, then there's a padding byte in the file - just read and discard
if (chunkLength % 2 != 0)
{
stream.ReadByte();
}
}
}
return(colorPalette);
}
/// <summary>
/// Gets the inverted ARGB color.
/// </summary>
/// <param name="input">The color to invert.</param>
/// <returns>An inverted ARGB struct.</returns>
public static ARGB GetInverted(ARGB input)
{
return(new ARGB(input.A, 255 - input.R, 255 - input.G, 255 - input.B));
}