727 lines
26 KiB
C#
727 lines
26 KiB
C#
using System;
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using System.Diagnostics;
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using System.Drawing;
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using Toolbox.Library;
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using System.Runtime.InteropServices;
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using DirectXTexNet;
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namespace Toolbox.Library
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{
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public class DDSCompressor
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{
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//Huge thanks to gdkchan and AbooodXD for the method of decomp BC5/BC4.
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//Todo. Add these to DDS code and add in methods to compress and decode more formats
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//BC7 also needs to be decompressed properly since OpenTK can't decompress those
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//BC4 actually breaks a bit with artifacts so i'll need to go back and fix
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private static byte[] BCnDecodeTile(byte[] Input, int Offset, bool IsBC1)
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{
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Color[] CLUT = new Color[4];
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int c0 = Get16(Input, Offset + 0);
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int c1 = Get16(Input, Offset + 2);
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CLUT[0] = DecodeRGB565(c0);
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CLUT[1] = DecodeRGB565(c1);
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CLUT[2] = CalculateCLUT2(CLUT[0], CLUT[1], c0, c1, IsBC1);
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CLUT[3] = CalculateCLUT3(CLUT[0], CLUT[1], c0, c1, IsBC1);
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int Indices = Get32(Input, Offset + 4);
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int IdxShift = 0;
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byte[] Output = new byte[4 * 4 * 4];
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int OOffset = 0;
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for (int TY = 0; TY < 4; TY++)
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{
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for (int TX = 0; TX < 4; TX++)
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{
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int Idx = (Indices >> IdxShift) & 3;
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IdxShift += 2;
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Color Pixel = CLUT[Idx];
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Output[OOffset + 0] = Pixel.B;
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Output[OOffset + 1] = Pixel.G;
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Output[OOffset + 2] = Pixel.R;
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Output[OOffset + 3] = Pixel.A;
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OOffset += 4;
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}
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}
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return Output;
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}
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private static Color DecodeRGB565(int Value)
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{
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int B = ((Value >> 0) & 0x1f) << 3;
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int G = ((Value >> 5) & 0x3f) << 2;
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int R = ((Value >> 11) & 0x1f) << 3;
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return Color.FromArgb(
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R | (R >> 5),
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G | (G >> 6),
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B | (B >> 5));
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}
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private static Color CalculateCLUT2(Color C0, Color C1, int c0, int c1, bool IsBC1)
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{
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if (c0 > c1 || !IsBC1)
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{
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return Color.FromArgb(
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(2 * C0.R + C1.R) / 3,
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(2 * C0.G + C1.G) / 3,
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(2 * C0.B + C1.B) / 3);
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}
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else
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{
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return Color.FromArgb(
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(C0.R + C1.R) / 2,
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(C0.G + C1.G) / 2,
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(C0.B + C1.B) / 2);
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}
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}
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private static Color CalculateCLUT3(Color C0, Color C1, int c0, int c1, bool IsBC1)
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{
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if (c0 > c1 || !IsBC1)
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{
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return
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Color.FromArgb(
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(2 * C1.R + C0.R) / 3,
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(2 * C1.G + C0.G) / 3,
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(2 * C1.B + C0.B) / 3);
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}
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return Color.Transparent;
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}
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public static Bitmap DecompressBC1(Byte[] data, int width, int height, bool IsSRGB)
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{
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int W = (width + 3) / 4;
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int H = (height + 3) / 4;
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byte[] Output = new byte[W * H * 64];
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for (int Y = 0; Y < H; Y++)
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{
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for (int X = 0; X < W; X++)
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{
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int IOffs = (Y * W + X) * 8;
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byte[] Tile = BCnDecodeTile(data, IOffs, true);
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int TOffset = 0;
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for (int TY = 0; TY < 4; TY++)
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{
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for (int TX = 0; TX < 4; TX++)
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{
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int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
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Output[OOffset + 0] = Tile[TOffset + 0];
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Output[OOffset + 1] = Tile[TOffset + 1];
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Output[OOffset + 2] = Tile[TOffset + 2];
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Output[OOffset + 3] = Tile[TOffset + 3];
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TOffset += 4;
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}
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}
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}
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}
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return BitmapExtension.GetBitmap(Output, W * 4, H * 4);
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}
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public static Bitmap DecompressBC3(Byte[] data, int width, int height, bool IsSRGB)
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{
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int W = (width + 3) / 4;
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int H = (height + 3) / 4;
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byte[] Output = new byte[W * H * 64];
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for (int Y = 0; Y < H; Y++)
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{
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for (int X = 0; X < W; X++)
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{
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int IOffs = (Y * W + X) * 16;
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byte[] Tile = BCnDecodeTile(data, IOffs + 8, false);
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byte[] Alpha = new byte[8];
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Alpha[0] = data[IOffs + 0];
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Alpha[1] = data[IOffs + 1];
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CalculateBC3Alpha(Alpha);
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int AlphaLow = Get32(data, IOffs + 2);
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int AlphaHigh = Get16(data, IOffs + 6);
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ulong AlphaCh = (uint)AlphaLow | (ulong)AlphaHigh << 32;
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int TOffset = 0;
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for (int TY = 0; TY < 4; TY++)
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{
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for (int TX = 0; TX < 4; TX++)
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{
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int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
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byte AlphaPx = Alpha[(AlphaCh >> (TY * 12 + TX * 3)) & 7];
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Output[OOffset + 0] = Tile[TOffset + 0];
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Output[OOffset + 1] = Tile[TOffset + 1];
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Output[OOffset + 2] = Tile[TOffset + 2];
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Output[OOffset + 3] = AlphaPx;
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TOffset += 4;
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}
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}
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}
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}
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return BitmapExtension.GetBitmap(Output, W * 4, H * 4);
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}
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public static Bitmap DecompressBC4(Byte[] data, int width, int height, bool IsSNORM)
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{
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int W = (width + 3) / 4;
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int H = (height + 3) / 4;
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byte[] Output = new byte[W * H * 64];
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for (int Y = 0; Y < H; Y++)
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{
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for (int X = 0; X < W; X++)
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{
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int IOffs = (Y * W + X) * 8;
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byte[] Red = new byte[8];
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Red[0] = data[IOffs + 0];
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Red[1] = data[IOffs + 1];
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CalculateBC3Alpha(Red);
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int RedLow = Get32(data, IOffs + 2);
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int RedHigh = Get16(data, IOffs + 6);
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ulong RedCh = (uint)RedLow | (ulong)RedHigh << 32;
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int TOffset = 0;
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int TW = Math.Min(width - X * 4, 4);
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int TH = Math.Min(height - Y * 4, 4);
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for (int TY = 0; TY < 4; TY++)
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{
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for (int TX = 0; TX < 4; TX++)
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{
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int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
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byte RedPx = Red[(RedCh >> (TY * 12 + TX * 3)) & 7];
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Output[OOffset + 0] = RedPx;
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Output[OOffset + 1] = RedPx;
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Output[OOffset + 2] = RedPx;
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Output[OOffset + 3] = 255;
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TOffset += 4;
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}
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}
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}
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}
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return BitmapExtension.GetBitmap(Output, W * 4, H * 4);
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}
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public static byte[] DecompressBC5(Byte[] data, int width, int height, bool IsSNORM, bool IsByteArray)
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{
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int W = (width + 3) / 4;
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int H = (height + 3) / 4;
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byte[] Output = new byte[width * height * 4];
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for (int Y = 0; Y < H; Y++)
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{
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for (int X = 0; X < W; X++)
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{
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int IOffs = (Y * W + X) * 16;
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byte[] Red = new byte[8];
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byte[] Green = new byte[8];
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Red[0] = data[IOffs + 0];
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Red[1] = data[IOffs + 1];
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Green[0] = data[IOffs + 8];
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Green[1] = data[IOffs + 9];
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if (IsSNORM == true)
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{
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CalculateBC3AlphaS(Red);
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CalculateBC3AlphaS(Green);
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}
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else
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{
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CalculateBC3Alpha(Red);
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CalculateBC3Alpha(Green);
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}
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int RedLow = Get32(data, IOffs + 2);
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int RedHigh = Get16(data, IOffs + 6);
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int GreenLow = Get32(data, IOffs + 10);
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int GreenHigh = Get16(data, IOffs + 14);
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ulong RedCh = (uint)RedLow | (ulong)RedHigh << 32;
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ulong GreenCh = (uint)GreenLow | (ulong)GreenHigh << 32;
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int TW = Math.Min(width - X * 4, 4);
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int TH = Math.Min(height - Y * 4, 4);
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if (IsSNORM == true)
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{
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for (int TY = 0; TY < TH; TY++)
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{
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for (int TX = 0; TX < TW; TX++)
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{
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int Shift = TY * 12 + TX * 3;
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int OOffset = ((Y * 4 + TY) * width + (X * 4 + TX)) * 4;
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byte RedPx = Red[(RedCh >> Shift) & 7];
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byte GreenPx = Green[(GreenCh >> Shift) & 7];
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if (IsSNORM == true)
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{
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RedPx += 0x80;
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GreenPx += 0x80;
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}
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float NX = (RedPx / 255f) * 2 - 1;
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float NY = (GreenPx / 255f) * 2 - 1;
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float NZ = (float)Math.Sqrt(1 - (NX * NX + NY * NY));
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Output[OOffset + 0] = Clamp((NX + 1) * 0.5f);
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Output[OOffset + 1] = Clamp((NY + 1) * 0.5f);
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Output[OOffset + 2] = Clamp((NZ + 1) * 0.5f);
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Output[OOffset + 3] = 0xff;
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}
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}
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}
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else
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{
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for (int TY = 0; TY < TH; TY++)
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{
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for (int TX = 0; TX < TW; TX++)
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{
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int Shift = TY * 12 + TX * 3;
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int OOffset = ((Y * 4 + TY) * width + (X * 4 + TX)) * 4;
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byte RedPx = Red[(RedCh >> Shift) & 7];
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byte GreenPx = Green[(GreenCh >> Shift) & 7];
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Output[OOffset + 0] = RedPx;
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Output[OOffset + 1] = GreenPx;
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Output[OOffset + 2] = 255;
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Output[OOffset + 3] = 255;
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}
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}
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}
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}
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}
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return Output;
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}
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public static Bitmap DecompressBC5(Byte[] data, int width, int height, bool IsSNORM)
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{
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int W = (width + 3) / 4;
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int H = (height + 3) / 4;
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byte[] Output = new byte[W * H * 64];
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for (int Y = 0; Y < H; Y++)
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{
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for (int X = 0; X < W; X++)
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{
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int IOffs = (Y * W + X) * 16;
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byte[] Red = new byte[8];
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byte[] Green = new byte[8];
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Red[0] = data[IOffs + 0];
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Red[1] = data[IOffs + 1];
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Green[0] = data[IOffs + 8];
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Green[1] = data[IOffs + 9];
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if (IsSNORM == true)
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{
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CalculateBC3AlphaS(Red);
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CalculateBC3AlphaS(Green);
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}
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else
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{
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CalculateBC3Alpha(Red);
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CalculateBC3Alpha(Green);
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}
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int RedLow = Get32(data, IOffs + 2);
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int RedHigh = Get16(data, IOffs + 6);
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int GreenLow = Get32(data, IOffs + 10);
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int GreenHigh = Get16(data, IOffs + 14);
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ulong RedCh = (uint)RedLow | (ulong)RedHigh << 32;
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ulong GreenCh = (uint)GreenLow | (ulong)GreenHigh << 32;
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int TW = Math.Min(width - X * 4, 4);
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int TH = Math.Min(height - Y * 4, 4);
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if (IsSNORM == true)
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{
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for (int TY = 0; TY < TH; TY++)
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{
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for (int TX = 0; TX < TW; TX++)
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{
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int Shift = TY * 12 + TX * 3;
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int OOffset = ((Y * 4 + TY) * width + (X * 4 + TX)) * 4;
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byte RedPx = Red[(RedCh >> Shift) & 7];
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byte GreenPx = Green[(GreenCh >> Shift) & 7];
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if (IsSNORM == true)
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{
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RedPx += 0x80;
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GreenPx += 0x80;
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}
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float NX = (RedPx / 255f) * 2 - 1;
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float NY = (GreenPx / 255f) * 2 - 1;
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float NZ = (float)Math.Sqrt(1 - (NX * NX + NY * NY));
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Output[OOffset + 0] = Clamp((NZ + 1) * 0.5f);
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Output[OOffset + 1] = Clamp((NY + 1) * 0.5f);
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Output[OOffset + 2] = Clamp((NX + 1) * 0.5f);
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Output[OOffset + 3] = 0xff;
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}
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}
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}
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else
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{
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for (int TY = 0; TY < TH; TY++)
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{
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for (int TX = 0; TX < TW; TX++)
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{
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int Shift = TY * 12 + TX * 3;
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int OOffset = ((Y * 4 + TY) * width + (X * 4 + TX)) * 4;
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byte RedPx = Red[(RedCh >> Shift) & 7];
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byte GreenPx = Green[(GreenCh >> Shift) & 7];
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Output[OOffset + 0] = 255;
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Output[OOffset + 1] = GreenPx;
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Output[OOffset + 2] = RedPx;
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Output[OOffset + 3] = 255;
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}
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}
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}
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}
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}
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return BitmapExtension.GetBitmap(Output, W * 4, H * 4);
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}
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public static unsafe byte[] CompressBlock(Byte[] data, int width, int height, DDS.DXGI_FORMAT format, float AlphaRef = 0.5f, STCompressionMode CompressionMode = STCompressionMode.Normal)
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{
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long inputRowPitch = width * 4;
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long inputSlicePitch = width * height * 4;
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if (data.Length == inputSlicePitch)
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{
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byte* buf;
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buf = (byte*)Marshal.AllocHGlobal((int)inputSlicePitch);
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Marshal.Copy(data, 0, (IntPtr)buf, (int)inputSlicePitch);
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DirectXTexNet.Image inputImage = new DirectXTexNet.Image(
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width, height, DXGI_FORMAT.R8G8B8A8_UNORM, inputRowPitch,
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inputSlicePitch, (IntPtr)buf, null);
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TexMetadata texMetadata = new TexMetadata(width, height, 1, 1, 1, 0, 0,
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DXGI_FORMAT.R8G8B8A8_UNORM, TEX_DIMENSION.TEXTURE2D);
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ScratchImage scratchImage = TexHelper.Instance.InitializeTemporary(
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new DirectXTexNet.Image[] { inputImage }, texMetadata, null);
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var compFlags = TEX_COMPRESS_FLAGS.DEFAULT;
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// compFlags |= TEX_COMPRESS_FLAGS.PARALLEL;
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if (format == DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM ||
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format == DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB ||
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format == DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_TYPELESS)
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{
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if (CompressionMode == STCompressionMode.Fast)
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compFlags |= TEX_COMPRESS_FLAGS.BC7_QUICK;
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}
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if (format == DDS.DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM_SRGB ||
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format == DDS.DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM_SRGB ||
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format == DDS.DXGI_FORMAT.DXGI_FORMAT_BC2_UNORM_SRGB ||
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format == DDS.DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM_SRGB ||
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format == DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB)
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{
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compFlags |= TEX_COMPRESS_FLAGS.SRGB;
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}
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using (var comp = scratchImage.Compress((DXGI_FORMAT)format, compFlags, 0.5f))
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{
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long outRowPitch;
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long outSlicePitch;
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TexHelper.Instance.ComputePitch((DXGI_FORMAT)format, width, height, out outRowPitch, out outSlicePitch, CP_FLAGS.NONE);
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byte[] result = new byte[outSlicePitch];
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Marshal.Copy(comp.GetImage(0).Pixels, result, 0, result.Length);
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inputImage = null;
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scratchImage.Dispose();
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return result;
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}
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}
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return null;
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}
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public static unsafe byte[] DecompressBlock(Byte[] data, int width, int height, DDS.DXGI_FORMAT format)
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{
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Console.WriteLine(format);
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Console.WriteLine(width);
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Console.WriteLine(height);
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long inputRowPitch;
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long inputSlicePitch;
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TexHelper.Instance.ComputePitch((DXGI_FORMAT)format, width, height, out inputRowPitch, out inputSlicePitch, CP_FLAGS.NONE);
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DXGI_FORMAT FormatDecompressed;
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if (format.ToString().Contains("SRGB"))
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FormatDecompressed = DXGI_FORMAT.R8G8B8A8_UNORM_SRGB;
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else
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FormatDecompressed = DXGI_FORMAT.R8G8B8A8_UNORM;
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byte* buf;
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buf = (byte*)Marshal.AllocHGlobal((int)inputSlicePitch);
|
|
Marshal.Copy(data, 0, (IntPtr)buf, (int)inputSlicePitch);
|
|
|
|
DirectXTexNet.Image inputImage = new DirectXTexNet.Image(
|
|
width, height, (DXGI_FORMAT)format, inputRowPitch,
|
|
inputSlicePitch, (IntPtr)buf, null);
|
|
|
|
TexMetadata texMetadata = new TexMetadata(width, height, 1, 1, 1, 0, 0,
|
|
(DXGI_FORMAT)format, TEX_DIMENSION.TEXTURE2D);
|
|
|
|
ScratchImage scratchImage = TexHelper.Instance.InitializeTemporary(
|
|
new DirectXTexNet.Image[] { inputImage }, texMetadata, null);
|
|
|
|
using (var decomp = scratchImage.Decompress(0, FormatDecompressed))
|
|
{
|
|
byte[] result = new byte[4 * width * height];
|
|
Marshal.Copy(decomp.GetImage(0).Pixels, result, 0, result.Length);
|
|
|
|
inputImage = null;
|
|
scratchImage.Dispose();
|
|
|
|
return result;
|
|
}
|
|
}
|
|
public static unsafe byte[] DecodePixelBlock(Byte[] data, int width, int height, DDS.DXGI_FORMAT format, float AlphaRef = 0.5f)
|
|
{
|
|
if (format == DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM)
|
|
{
|
|
byte[] result = new byte[data.Length];
|
|
Array.Copy(data, result, data.Length);
|
|
return result;
|
|
}
|
|
|
|
return Convert(data, width, height, (DXGI_FORMAT)format, DXGI_FORMAT.R8G8B8A8_UNORM);
|
|
}
|
|
public static unsafe byte[] EncodePixelBlock(Byte[] data, int width, int height, DDS.DXGI_FORMAT format, float AlphaRef = 0.5f)
|
|
{
|
|
if (format == DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM || format == DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM_SRGB)
|
|
return data;
|
|
|
|
return Convert(data, width, height, DXGI_FORMAT.R8G8B8A8_UNORM, (DXGI_FORMAT)format);
|
|
}
|
|
public static unsafe byte[] Convert(Byte[] data, int width, int height, DXGI_FORMAT inputFormat, DXGI_FORMAT outputFormat)
|
|
{
|
|
long inputRowPitch;
|
|
long inputSlicePitch;
|
|
TexHelper.Instance.ComputePitch(inputFormat, width, height, out inputRowPitch, out inputSlicePitch, CP_FLAGS.NONE);
|
|
|
|
if (data.Length == inputSlicePitch)
|
|
{
|
|
byte* buf;
|
|
buf = (byte*)Marshal.AllocHGlobal((int)inputSlicePitch);
|
|
Marshal.Copy(data, 0, (IntPtr)buf, (int)inputSlicePitch);
|
|
|
|
DirectXTexNet.Image inputImage = new DirectXTexNet.Image(
|
|
width, height, inputFormat, inputRowPitch,
|
|
inputSlicePitch, (IntPtr)buf, null);
|
|
|
|
TexMetadata texMetadata = new TexMetadata(width, height, 1, 1, 1, 0, 0,
|
|
inputFormat, TEX_DIMENSION.TEXTURE2D);
|
|
|
|
ScratchImage scratchImage = TexHelper.Instance.InitializeTemporary(
|
|
new DirectXTexNet.Image[] { inputImage }, texMetadata, null);
|
|
|
|
var convFlags = TEX_FILTER_FLAGS.DEFAULT;
|
|
|
|
if (inputFormat == DXGI_FORMAT.B8G8R8A8_UNORM_SRGB ||
|
|
inputFormat == DXGI_FORMAT.B8G8R8X8_UNORM_SRGB ||
|
|
inputFormat == DXGI_FORMAT.R8G8B8A8_UNORM_SRGB)
|
|
{
|
|
convFlags |= TEX_FILTER_FLAGS.SRGB;
|
|
}
|
|
|
|
using (var decomp = scratchImage.Convert(0, outputFormat, convFlags, 0.5f))
|
|
{
|
|
long outRowPitch;
|
|
long outSlicePitch;
|
|
TexHelper.Instance.ComputePitch(outputFormat, width, height, out outRowPitch, out outSlicePitch, CP_FLAGS.NONE);
|
|
|
|
byte[] result = new byte[outSlicePitch];
|
|
Marshal.Copy(decomp.GetImage(0).Pixels, result, 0, result.Length);
|
|
|
|
inputImage = null;
|
|
scratchImage.Dispose();
|
|
|
|
|
|
return result;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
/* public static byte[] CompressBlock(Byte[] data, int width, int height, DDS.DXGI_FORMAT format, float AlphaRef)
|
|
{
|
|
return DirectXTex.ImageCompressor.Compress(data, width, height, (int)format, AlphaRef);
|
|
}*/
|
|
|
|
public static byte[] DecompressCompLibBlock(Byte[] data, int width, int height, DDS.DXGI_FORMAT format)
|
|
{
|
|
byte[] output = null;
|
|
|
|
switch (format)
|
|
{
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM:
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM_SRGB:
|
|
output = CSharpImageLibrary.DDS.Dxt.DecompressDxt1(data, (int)width, (int)height);
|
|
break;
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM:
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM_SRGB:
|
|
output = CSharpImageLibrary.DDS.Dxt.DecompressDxt5(data, (int)width, (int)height);
|
|
break;
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC4_UNORM:
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC4_SNORM:
|
|
output = CSharpImageLibrary.DDS.Dxt.DecompressDxt4(data, (int)width, (int)height);
|
|
break;
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC5_UNORM:
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC5_SNORM:
|
|
output = CSharpImageLibrary.DDS.Dxt.DecompressDxt4(data, (int)width, (int)height);
|
|
break;
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM:
|
|
case DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB:
|
|
output = CSharpImageLibrary.DDS.Dxt.DecompressBc7(data, (int)width, (int)height);
|
|
break;
|
|
default:
|
|
output = DecompressBlock(data, width, height, format);
|
|
break;
|
|
|
|
}
|
|
|
|
return output;
|
|
}
|
|
|
|
public static Bitmap DecompressCompLibBlock(Byte[] data, int width, int height, DDS.DXGI_FORMAT format, bool GetBitmap)
|
|
{
|
|
return BitmapExtension.GetBitmap(DecompressBlock(data, width, height, format), (int)width, (int)height);
|
|
}
|
|
|
|
public static int Get16(byte[] Data, int Address)
|
|
{
|
|
return
|
|
Data[Address + 0] << 0 |
|
|
Data[Address + 1] << 8;
|
|
}
|
|
|
|
public static int Get32(byte[] Data, int Address)
|
|
{
|
|
return
|
|
Data[Address + 0] << 0 |
|
|
Data[Address + 1] << 8 |
|
|
Data[Address + 2] << 16 |
|
|
Data[Address + 3] << 24;
|
|
}
|
|
|
|
private static byte Clamp(float Value)
|
|
{
|
|
if (Value > 1)
|
|
{
|
|
return 0xff;
|
|
}
|
|
else if (Value < 0)
|
|
{
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
return (byte)(Value * 0xff);
|
|
}
|
|
}
|
|
|
|
private static void CalculateBC3Alpha(byte[] Alpha)
|
|
{
|
|
for (int i = 2; i < 8; i++)
|
|
{
|
|
if (Alpha[0] > Alpha[1])
|
|
{
|
|
Alpha[i] = (byte)(((8 - i) * Alpha[0] + (i - 1) * Alpha[1]) / 7);
|
|
}
|
|
else if (i < 6)
|
|
{
|
|
Alpha[i] = (byte)(((6 - i) * Alpha[0] + (i - 1) * Alpha[1]) / 7);
|
|
}
|
|
else if (i == 6)
|
|
{
|
|
Alpha[i] = 0;
|
|
}
|
|
else /* i == 7 */
|
|
{
|
|
Alpha[i] = 0xff;
|
|
}
|
|
}
|
|
}
|
|
private static void CalculateBC3AlphaS(byte[] Alpha)
|
|
{
|
|
for (int i = 2; i < 8; i++)
|
|
{
|
|
if ((sbyte)Alpha[0] > (sbyte)Alpha[1])
|
|
{
|
|
Alpha[i] = (byte)(((8 - i) * (sbyte)Alpha[0] + (i - 1) * (sbyte)Alpha[1]) / 7);
|
|
}
|
|
else if (i < 6)
|
|
{
|
|
Alpha[i] = (byte)(((6 - i) * (sbyte)Alpha[0] + (i - 1) * (sbyte)Alpha[1]) / 7);
|
|
}
|
|
else if (i == 6)
|
|
{
|
|
Alpha[i] = 0x80;
|
|
}
|
|
else /* i == 7 */
|
|
{
|
|
Alpha[i] = 0x7f;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|