DecodeInterpolatedAlphaBlock()

void Microsoft.Xna.Framework.Graphics.DxtDecoder.DecodeInterpolatedAlphaBlock ( byte[] source, int sourceOffset, Color[] result, int resultOffset )

inlineprivate

Definition at line 132 of file DxtDecoder.cs.

    {
        byte b = source[sourceOffset];
        byte b2 = source[sourceOffset + 1];
        alphaPalette[0] = b;
        alphaPalette[1] = b2;
        if (b > b2)
        {
            alphaPalette[2] = (byte)((6 * b + b2 + 3) / 7);
            alphaPalette[3] = (byte)((5 * b + 2 * b2 + 3) / 7);
            alphaPalette[4] = (byte)((4 * b + 3 * b2 + 3) / 7);
            alphaPalette[5] = (byte)((3 * b + 4 * b2 + 3) / 7);
            alphaPalette[6] = (byte)((2 * b + 5 * b2 + 3) / 7);
            alphaPalette[7] = (byte)((b + 6 * b2 + 3) / 7);
        }
        else
        {
            alphaPalette[2] = (byte)((4 * b + b2 + 2) / 5);
            alphaPalette[3] = (byte)((3 * b + 2 * b2 + 2) / 5);
            alphaPalette[4] = (byte)((2 * b + 3 * b2 + 2) / 5);
            alphaPalette[5] = (byte)((b + 4 * b2 + 2) / 5);
            alphaPalette[6] = 0;
            alphaPalette[7] = byte.MaxValue;
        }
        ulong num = Read48(source, sourceOffset + 2);
        for (int i = 0; i < 4; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                int num2 = (int)num & 7;
                num >>= 3;
                result[resultOffset + i * width + j].A = alphaPalette[num2];
            }
        }
    }

References Microsoft.Xna.Framework.Color.A, Microsoft.Xna.Framework.Graphics.DxtDecoder.alphaPalette, Microsoft.Xna.Framework.Graphics.DxtDecoder.Read48(), System.source, and Microsoft.Xna.Framework.Graphics.DxtDecoder.width.

Referenced by Microsoft.Xna.Framework.Graphics.DxtDecoder.Decode().