public void Decode()
{
Bc1Block block = new Bc1Block();
block.color0 = new ColorRgb565(255, 255, 255);
block.color1 = new ColorRgb565(0, 0, 0);
Assert.False(block.HasAlphaOrBlack);
block[0] = 1;
block[1] = 1;
block[2] = 1;
block[3] = 1;
block[4] = 3;
block[5] = 3;
block[6] = 3;
block[7] = 3;
block[8] = 2;
block[9] = 2;
block[10] = 2;
block[11] = 2;
block[12] = 0;
block[13] = 0;
block[14] = 0;
block[15] = 0;
var raw = block.Decode(false);
Assert.Equal(Rgba32.Black, raw.p00);
Assert.Equal(Rgba32.Black, raw.p10);
Assert.Equal(Rgba32.Black, raw.p20);
Assert.Equal(Rgba32.Black, raw.p30);
Assert.Equal(new Rgba32(85, 85, 85), raw.p01);
Assert.Equal(new Rgba32(85, 85, 85), raw.p11);
Assert.Equal(new Rgba32(85, 85, 85), raw.p21);
Assert.Equal(new Rgba32(85, 85, 85), raw.p31);
Assert.Equal(new Rgba32(170, 170, 170), raw.p02);
Assert.Equal(new Rgba32(170, 170, 170), raw.p12);
Assert.Equal(new Rgba32(170, 170, 170), raw.p22);
Assert.Equal(new Rgba32(170, 170, 170), raw.p32);
Assert.Equal(Rgba32.White, raw.p03);
Assert.Equal(Rgba32.White, raw.p13);
Assert.Equal(Rgba32.White, raw.p23);
Assert.Equal(Rgba32.White, raw.p33);
}
public void DecodeAlpha()
{
Bc1Block block = new Bc1Block();
block.color0 = new ColorRgb565(200, 200, 200);
block.color1 = new ColorRgb565(255, 255, 255);
Assert.True(block.HasAlphaOrBlack);
block[0] = 0;
block[1] = 0;
block[2] = 0;
block[3] = 0;
block[4] = 3;
block[5] = 3;
block[6] = 3;
block[7] = 3;
block[8] = 2;
block[9] = 2;
block[10] = 2;
block[11] = 2;
block[12] = 1;
block[13] = 1;
block[14] = 1;
block[15] = 1;
var raw = block.Decode(true);
Assert.Equal(new Rgba32(206, 203, 206), raw.p00);
Assert.Equal(new Rgba32(206, 203, 206), raw.p10);
Assert.Equal(new Rgba32(206, 203, 206), raw.p20);
Assert.Equal(new Rgba32(206, 203, 206), raw.p30);
Assert.Equal(new Rgba32(0, 0, 0, 0), raw.p01);
Assert.Equal(new Rgba32(0, 0, 0, 0), raw.p11);
Assert.Equal(new Rgba32(0, 0, 0, 0), raw.p21);
Assert.Equal(new Rgba32(0, 0, 0, 0), raw.p31);
Assert.Equal(new Rgba32(230, 228, 230), raw.p02);
Assert.Equal(new Rgba32(230, 228, 230), raw.p12);
Assert.Equal(new Rgba32(230, 228, 230), raw.p22);
Assert.Equal(new Rgba32(230, 228, 230), raw.p32);
Assert.Equal(Rgba32.White, raw.p03);
Assert.Equal(Rgba32.White, raw.p13);
Assert.Equal(Rgba32.White, raw.p23);
Assert.Equal(Rgba32.White, raw.p33);
}
private static Bc1Block TryColors(RawBlock4X4Rgba32 rawBlock, ColorRgb565 color0, ColorRgb565 color1, out float error, float rWeight = 0.3f, float gWeight = 0.6f, float bWeight = 0.1f)
{
Bc1Block output = new Bc1Block();
var pixels = rawBlock.AsSpan;
output.color0 = color0;
output.color1 = color1;
var c0 = color0.ToColorRgb24();
var c1 = color1.ToColorRgb24();
ReadOnlySpan <ColorRgb24> colors = output.HasAlphaOrBlack ?
stackalloc ColorRgb24[] {
c0,
c1,
c0 *(1.0 / 2.0) + c1 * (1.0 / 2.0),
new ColorRgb24(0, 0, 0)
} : stackalloc ColorRgb24[] {
