static public void CompressBlock(byte4[] Colors, ref DXT5.AlphaColorBlock Block)
{
var MinColor = default(byte4);
var MaxColor = default(byte4);
Console.WriteLine(Colors.Select(Color => (ARGB_Rev)(Y_CO_CG_A)Color).ToStringArray());
GetMinMaxYCoCg(Colors, out MinColor, out MaxColor);
Console.WriteLine("-");
Console.WriteLine((ARGB_Rev)MinColor);
Console.WriteLine((ARGB_Rev)MaxColor);
ScaleYCoCg(Colors, ref MinColor, ref MaxColor);
Console.WriteLine("-");
Console.WriteLine((ARGB_Rev)MinColor);
Console.WriteLine((ARGB_Rev)MaxColor);
InsetYCoCgBBox(ref MinColor, ref MaxColor);
Console.WriteLine("-");
Console.WriteLine((ARGB_Rev)MinColor);
Console.WriteLine((ARGB_Rev)MaxColor);
SelectYCoCgDiagonal(Colors, ref MinColor, ref MaxColor);
Console.WriteLine("-");
Console.WriteLine((ARGB_Rev)MinColor);
Console.WriteLine((ARGB_Rev)MaxColor);
}
/*
* void EmitAlphaIndices(byte* colorBlock, byte minAlpha, byte maxAlpha)
* {
*
* int i;
* //assert( maxAlpha >= minAlpha );
*
* const int ALPHA_RANGE = 7;
*
* byte mid, ab1, ab2, ab3, ab4, ab5, ab6, ab7;
* var indexes = stackalloc byte[16];
*
* mid = (byte)((maxAlpha - minAlpha) / (2 * ALPHA_RANGE));
*
* ab1 = (byte)(minAlpha + mid);
* ab2 = (byte)((6 * maxAlpha + 1 * minAlpha) / ALPHA_RANGE + mid);
* ab3 = (byte)((5 * maxAlpha + 2 * minAlpha) / ALPHA_RANGE + mid);
* ab4 = (byte)((4 * maxAlpha + 3 * minAlpha) / ALPHA_RANGE + mid);
* ab5 = (byte)((3 * maxAlpha + 4 * minAlpha) / ALPHA_RANGE + mid);
* ab6 = (byte)((2 * maxAlpha + 5 * minAlpha) / ALPHA_RANGE + mid);
* ab7 = (byte)((1 * maxAlpha + 6 * minAlpha) / ALPHA_RANGE + mid);
*
* for (i = 0; i < 16; i++)
* {
* byte a = colorBlock[i * 4 + 3];
* int b1 = (a <= ab1) ? 1 : 0;
* int b2 = (a <= ab2) ? 1 : 0;
* int b3 = (a <= ab3) ? 1 : 0;
* int b4 = (a <= ab4) ? 1 : 0;
* int b5 = (a <= ab5) ? 1 : 0;
* int b6 = (a <= ab6) ? 1 : 0;
* int b7 = (a <= ab7) ? 1 : 0;
* int index = (b1 + b2 + b3 + b4 + b5 + b6 + b7 + 1) & 7;
* indexes[i] = (byte)(index ^ ((2 > index) ? 1 : 0));
* }
*
* EmitByte((byte)((indexes[0] >> 0) | (indexes[1] << 3) | (indexes[2] << 6)));
* EmitByte((byte)((indexes[2] >> 2) | (indexes[3] << 1) | (indexes[4] << 4) | (indexes[5] << 7)));
* EmitByte((byte)((indexes[5] >> 1) | (indexes[6] << 2) | (indexes[7] << 5)));
*
* EmitByte((byte)((indexes[8] >> 0) | (indexes[9] << 3) | (indexes[10] << 6)));
* EmitByte((byte)((indexes[10] >> 2) | (indexes[11] << 1) | (indexes[12] << 4) | (indexes[13] << 7)));
* EmitByte((byte)((indexes[13] >> 1) | (indexes[14] << 2) | (indexes[15] << 5)));
* }
*
* void EmitColorIndices(byte* colorBlock, byte* minColor, byte* maxColor)
* {
* var colors = new ushort[4, 4];
* int i;
* uint result = 0;
*
* colors[0, 0] = (ushort)((maxColor[0] & C565_5_MASK) | (maxColor[0] >> 5));
* colors[0, 1] = (ushort)((maxColor[1] & C565_6_MASK) | (maxColor[1] >> 6));
* colors[0, 2] = (ushort)((maxColor[2] & C565_5_MASK) | (maxColor[2] >> 5));
* colors[0, 3] = (ushort)(0);
* colors[1, 0] = (ushort)((minColor[0] & C565_5_MASK) | (minColor[0] >> 5));
* colors[1, 1] = (ushort)((minColor[1] & C565_6_MASK) | (minColor[1] >> 6));
* colors[1, 2] = (ushort)((minColor[2] & C565_5_MASK) | (minColor[2] >> 5));
* colors[1, 3] = (ushort)(0);
* colors[2, 0] = (ushort)((2 * colors[0, 0] + 1 * colors[1, 0]) / 3);
* colors[2, 1] = (ushort)((2 * colors[0, 1] + 1 * colors[1, 1]) / 3);
* colors[2, 2] = (ushort)((2 * colors[0, 2] + 1 * colors[1, 2]) / 3);
* colors[2, 3] = (ushort)(0);
* colors[3, 0] = (ushort)((1 * colors[0, 0] + 2 * colors[1, 0]) / 3);
* colors[3, 1] = (ushort)((1 * colors[0, 1] + 2 * colors[1, 1]) / 3);
* colors[3, 2] = (ushort)((1 * colors[0, 2] + 2 * colors[1, 2]) / 3);
* colors[3, 3] = (ushort)(0);
*
* for (i = 15; i >= 0; i--)
* {
* int c0, c1, d0, d1, d2, d3;
*
* c0 = colorBlock[i * 4 + 0];
* c1 = colorBlock[i * 4 + 1];
*
* d0 = Math.Abs(colors[0, 0] - c0) + Math.Abs(colors[0, 1] - c1);
* d1 = Math.Abs(colors[1, 0] - c0) + Math.Abs(colors[1, 1] - c1);
* d2 = Math.Abs(colors[2, 0] - c0) + Math.Abs(colors[2, 1] - c1);
* d3 = Math.Abs(colors[3, 0] - c0) + Math.Abs(colors[3, 1] - c1);
*
* int b0 = (d0 > d3) ? 1 : 0;
* int b1 = (d1 > d2) ? 1 : 0;
* int b2 = (d0 > d2) ? 1 : 0;
* int b3 = (d1 > d3) ? 1 : 0;
* int b4 = (d2 > d3) ? 1 : 0;
*
* int x0 = b1 & b2;
* int x1 = b0 & b3;
* int x2 = b0 & b4;
*
* result |= (uint)((x2 | ((x0 | x1) << 1)) << (i << 1));
* }
*
* EmitDoubleWord(result);
* }
*/
static public void CompressBlock(ARGB_Rev[] Colors, ref DXT5.AlphaColorBlock Block)
{
var ColorsCoGg = new byte4[16];
Console.WriteLine(Colors.ToStringArray());
for (int n = 0; n < 16; n++)
{
ColorsCoGg[n] = (byte4)Colors[n];
}
CompressBlock(ColorsCoGg, ref Block);
}