private int GetBlockLength(AseColorEntryData block)
{
int blockLength;
blockLength = this.GetBlockLength((_BlockData)block);
blockLength += 6; // 4 bytes for the color space and 2 bytes for the color type
// TODO: Include support for other color spaces
blockLength += 12; // length of RGB data (3 * 4 bytes)
return(blockLength);
}
private void WriteBlock(Stream stream, AseColorEntryData block)
{
int blockLength;
blockLength = this.GetBlockLength(block);
stream.WriteBigEndian((ushort)AseBlockType.Color);
stream.WriteBigEndian(blockLength);
this.WriteNullTerminatedString(stream, block.Name);
stream.Write("RGB ");
stream.WriteBigEndian((float)(block.R / 255.0));
stream.WriteBigEndian((float)(block.G / 255.0));
stream.WriteBigEndian((float)(block.B / 255.0));
stream.WriteBigEndian((ushort)block.Type);
this.WriteExtraData(stream, block.ExtraData);
}
private _BlockData ReadColorBlock(Stream stream, Stack <AseColorEntryCollection> colorStack)
{
AseColorEntryData block;
string colorMode;
byte r;
byte g;
byte b;
AseColorType colorType;
string name;
AseColorEntryCollection colors;
// get the name of the color
// this is stored as a null terminated string
// with the length of the byte data stored before
// the string data in a 16bit int
name = stream.ReadStringBigEndian();
// get the mode of the color, which is stored
// as four ASCII characters
colorMode = stream.ReadString(4);
// read the color data
// how much data we need to read depends on the
// color mode we previously read
switch (colorMode)
{
case "RGB ":
// RGB is comprised of three floating point values ranging from 0-1.0
float value1;
float value2;
float value3;
value1 = stream.ReadSingleBigEndian();
value2 = stream.ReadSingleBigEndian();
value3 = stream.ReadSingleBigEndian();
r = (byte)Convert.ToInt32(value1 * 255);
g = (byte)Convert.ToInt32(value2 * 255);
b = (byte)Convert.ToInt32(value3 * 255);
break;
case "CMYK":
// CMYK is comprised of four floating point values
throw new InvalidDataException(string.Format("Unsupported color mode '{0}'.", colorMode));
case "LAB ":
// LAB is comprised of three floating point values
throw new InvalidDataException(string.Format("Unsupported color mode '{0}'.", colorMode));
case "Gray":
// Grayscale is comprised of a single floating point value
throw new InvalidDataException(string.Format("Unsupported color mode '{0}'.", colorMode));
default:
throw new InvalidDataException(string.Format("Unsupported color mode '{0}'.", colorMode));
}
// the final "official" piece of data is a color type
colorType = (AseColorType)stream.ReadUInt16BigEndian();
block = new AseColorEntryData
{
R = r,
G = g,
B = b,
Name = name,
Type = colorType
};
colors = colorStack.Peek();
colors.Add(block);
return(block);
}
