/// <summary>
/// Deserializes the <see cref="ColourCollection" /> contained by the specified <see cref="Stream" />.
/// </summary>
/// <param name="stream">The <see cref="Stream" /> that contains the palette to deserialize.</param>
/// <returns>The <see cref="ColourCollection" /> being deserialized.</returns>
public override ColourCollection Deserialise(Stream stream)
{
ColourCollection results;
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
results = new ColourCollection();
using (StreamReader reader = new StreamReader(stream))
{
string header;
int swatchIndex;
bool readingPalette;
readingPalette = false;
// check signature
header = reader.ReadLine();
if (header != "GIMP Palette")
{
throw new InvalidDataException("Invalid palette file");
}
// read the swatches
swatchIndex = 0;
while (!reader.EndOfStream)
{
string data;
data = reader.ReadLine();
if (!string.IsNullOrEmpty(data))
{
if (data[0] == '#')
{
// comment
readingPalette = true;
}
else if (!readingPalette)
{
// custom attribute
}
else if (readingPalette)
{
int r;
int g;
int b;
string[] parts;
string name;
// TODO: Optimize this a touch. Microoptimization? Maybe.
parts = !string.IsNullOrEmpty(data) ? data.Split(new[]
{
' ',
'\t'
}, StringSplitOptions.RemoveEmptyEntries) : new string[0];
name = parts.Length > 3 ? string.Join(" ", parts, 3, parts.Length - 3) : null;
if (!int.TryParse(parts[0], out r) || !int.TryParse(parts[1], out g) || !int.TryParse(parts[2], out b))
{
throw new InvalidDataException(string.Format("Invalid palette contents found with data '{0}'", data));
}
results.Add(Color.FromArgb(r, g, b));
#if USENAMEHACK
results.SetName(swatchIndex, name);
#endif
swatchIndex++;
}
}
}
}
return(results);
}
protected virtual ColourCollection ReadPalette(Stream stream, AdobePhotoshopColourSwatchFileVersion version)
{
int colourCount;
ColourCollection results;
results = new ColourCollection();
// read the number of colors, which also occupies two bytes
colourCount = this.ReadInt16(stream);
for (int i = 0; i < colourCount; i++)
{
AdobePhotoshopColourSwatchColourSpace colorSpace;
int value1;
int value2;
int value3;
string name;
// again, two bytes for the color space
colorSpace = (AdobePhotoshopColourSwatchColourSpace)this.ReadInt16(stream);
value1 = this.ReadInt16(stream);
value2 = this.ReadInt16(stream);
value3 = this.ReadInt16(stream);
this.ReadInt16(stream); // only CMYK supports this field. As we can't handle CMYK colors, we read the value to advance the stream but don't do anything with it
if (version == AdobePhotoshopColourSwatchFileVersion.VERSION2)
{
int length;
// need to read the name even though currently our colour collection doesn't support names
length = this.ReadInt32(stream);
name = this.ReadString(stream, length);
}
else
{
name = string.Empty;
}
switch (colorSpace)
{
case AdobePhotoshopColourSwatchColourSpace.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;
green = value2 / 256;
blue = value3 / 256;
results.Add(Color.FromArgb(red, green, blue));
break;
case AdobePhotoshopColourSwatchColourSpace.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;
saturation = value2 / 655.35;
brightness = value3 / 655.35;
results.Add(new HSLColour(hue, saturation, brightness).ToRgbColour());
break;
case AdobePhotoshopColourSwatchColourSpace.GRAYSCALE:
int gray;
// Grayscale.
// The first value in the color data is the gray value, from 0...10000.
gray = (int)(value1 / 39.0625);
results.Add(Color.FromArgb(gray, gray, gray));
break;
default:
throw new InvalidDataException(string.Format("Color space '{0}' not supported.", colorSpace));
}
#if USENAMEHACK
results.SetName(i, name);
#endif
}
return(results);
}
