public void ConversionToBytesSetsColorIndexes()
{
byte expectedIndexes0 = "11 10 01 00".AsByte(); // d c b a
byte expectedIndexes1 = "00 11 10 01".AsByte(); // h g f e
byte expectedIndexes2 = "01 00 11 10".AsByte(); // l k j i
byte expectedIndexes3 = "10 01 00 11".AsByte(); // p o n m
var block = new BC3BlockData();
// pixel value byte
block.ColorIndexes[0] = 0; // a(0,3) 00 indexes0
block.ColorIndexes[1] = 1; // b(1,3) 01
block.ColorIndexes[2] = 2; // c(2,3) 10
block.ColorIndexes[3] = 3; // d(3,3) 11
block.ColorIndexes[4] = 1; // e(0,2) 01 indexes1
block.ColorIndexes[5] = 2; // f(1,2) 10
block.ColorIndexes[6] = 3; // g(2,2) 11
block.ColorIndexes[7] = 0; // h(3,2) 00
block.ColorIndexes[8] = 2; // i(0,1) 10 indexes2
block.ColorIndexes[9] = 3; // j(1,1) 11
block.ColorIndexes[10] = 0; // k(2,1) 00
block.ColorIndexes[11] = 1; // l(3,1) 01
block.ColorIndexes[12] = 3; // m(0,0) 11 indexes3
block.ColorIndexes[13] = 0; // n(1,0) 00
block.ColorIndexes[14] = 1; // o(2,0) 01
block.ColorIndexes[15] = 2; // p(3,0) 10
var buffer = block.ToBytes();
byte indexes0 = buffer[12];
byte indexes1 = buffer[13];
byte indexes2 = buffer[14];
byte indexes3 = buffer[15];
Assert.AreEqual(expectedIndexes0, indexes0);
Assert.AreEqual(expectedIndexes1, indexes1);
Assert.AreEqual(expectedIndexes2, indexes2);
Assert.AreEqual(expectedIndexes3, indexes3);
}
public void ConstructionFromBytesSetsAlphaIndexes()
{
// Increment until max value, then decrement
byte alphas0 = "10 001 000".AsByte(); // c b a
byte alphas1 = "1 100 011 0".AsByte(); // f e d c
byte alphas2 = "111 110 10".AsByte(); // h g f
byte alphas3 = "01 110 111".AsByte(); // k j i
byte alphas4 = "0 011 100 1".AsByte(); // n m l k
byte alphas5 = "000 001 01".AsByte(); // p o n
var bytes = new byte[BlockFormat.BC3ByteSize];
bytes[2] = alphas2;
bytes[3] = alphas1;
bytes[4] = alphas0;
bytes[5] = alphas5;
bytes[6] = alphas4;
bytes[7] = alphas3;
var block = BC3BlockData.FromBytes(bytes);
Assert.AreEqual(0, block.AlphaIndexes[0]); // a 000
Assert.AreEqual(1, block.AlphaIndexes[1]); // b 001
Assert.AreEqual(2, block.AlphaIndexes[2]); // c 010
Assert.AreEqual(3, block.AlphaIndexes[3]); // d 011
Assert.AreEqual(4, block.AlphaIndexes[4]); // e 100
Assert.AreEqual(5, block.AlphaIndexes[5]); // f 101
Assert.AreEqual(6, block.AlphaIndexes[6]); // g 110
Assert.AreEqual(7, block.AlphaIndexes[7]); // h 111
Assert.AreEqual(7, block.AlphaIndexes[8]); // i 111
Assert.AreEqual(6, block.AlphaIndexes[9]); // j 110
Assert.AreEqual(5, block.AlphaIndexes[10]); // k 101
Assert.AreEqual(4, block.AlphaIndexes[11]); // l 100
Assert.AreEqual(3, block.AlphaIndexes[12]); // m 011
Assert.AreEqual(2, block.AlphaIndexes[13]); // n 010
Assert.AreEqual(1, block.AlphaIndexes[14]); // o 001
Assert.AreEqual(0, block.AlphaIndexes[15]); // p 000
}
