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 = ReadInt16(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)(ReadInt16(stream));
value1 = ReadInt16(stream);
value2 = ReadInt16(stream);
value3 = ReadInt16(stream);
value4 = ReadInt16(stream);
if (version == FileVersion.Version2)
{
int length;
// need to read the name even though currently our colour collection doesn't support names
length = ReadInt32(stream);
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(Color.FromRgb((byte)red, (byte)green, (byte)blue));
break;
case ColorSpace.Hsb:
double hue;
double saturation;
double 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 / 182.04; // 0-359
saturation = value2 / 655.35 / 100; // 0-1.0
brightness = value3 / 655.35 / 100; // 0-1.0
results.Add(ColorsHelper.CreateFromHSV(hue, saturation, brightness));
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(Color.FromRgb((byte)gray, (byte)gray, (byte)gray));
break;
default:
throw new InvalidDataException(string.Format("Color space '{0}' not supported.", colorSpace));
}
}
return(results);
}
