示例#1
0
        private void DecompressDXT3()
        {
            Colour8888[] colours = new Colour8888[4];
            uint bitmask, offset;
            int i, j, k, x, y, z, Select;
            ushort word, colour0, colour1;
            byte[] alpha; //temp;

            MemoryStream mem = new MemoryStream(this.compdata.Length);
            mem.Write(this.compdata, 0, this.compdata.Length);
            mem.Seek(0, SeekOrigin.Begin);
            BinaryReader r = new BinaryReader(mem);

            for (z=0; z<this.depth; z++) {
                for (y=0; y<this.height; y+=4) {
                    for (x=0; x<this.width; x+=4) {
                        alpha = r.ReadBytes(8);

                        colour0 = r.ReadUInt16();
                        colour1 = r.ReadUInt16();
                        this.ReadColour(colour0, ref colours[0]);
                        this.ReadColour(colour1, ref colours[1]);

                        bitmask = r.ReadUInt32();

                        colours[2].b = (byte)((2 * colours[0].b + colours[1].b + 1) / 3);
                        colours[2].g = (byte)((2 * colours[0].g + colours[1].g + 1) / 3);
                        colours[2].r = (byte)((2 * colours[0].r + colours[1].r + 1) / 3);

                        colours[3].b = (byte)((colours[0].b + 2 * colours[1].b + 1) / 3);
                        colours[3].g = (byte)((colours[0].g + 2 * colours[1].g + 1) / 3);
                        colours[3].r = (byte)((colours[0].r + 2 * colours[1].r + 1) / 3);

                        for (j = 0, k = 0; j < 4; j++) {
                            for (i = 0; i < 4; k++, i++) {
                                Select = (int)((bitmask & (0x03 << k*2)) >> k*2);

                                if (((x + i) < this.width) && ((y + j) < this.height)) {
                                    offset = (uint)(z * this.sizeofplane + (y + j) * this.bps + (x + i) * this.bpp);
                                    this.rawidata[offset] = (byte)colours[Select].r;
                                    this.rawidata[offset + 1] = (byte)colours[Select].g;
                                    this.rawidata[offset + 2] = (byte)colours[Select].b;
                                }
                            }
                        }

                        for (j = 0; j < 4; j++) {
                            word = (ushort)(alpha[2*j] + 256*alpha[2*j+1]);
                            for (i = 0; i < 4; i++) {
                                if (((x + i) < this.width) && ((y + j) < this.height)) {
                                    offset = (uint)(z * this.sizeofplane + (y + j) * this.bps + (x + i) * this.bpp + 3);
                                    this.rawidata[offset] = (byte)(word & 0x0F);
                                    this.rawidata[offset] = (byte)(this.rawidata[offset] | (this.rawidata[offset] << 4));
                                }
                                word >>= 4;
                            }
                        }
                    }
                }
            }
        }
示例#2
0
        private void ReadColour(ushort Data, ref Colour8888 op)
        {
            byte r, g, b;

            b = (byte)(Data & 0x1f);
            g = (byte)((Data & 0x7E0) >> 5);
            r = (byte)((Data & 0xF800) >> 11);

            op.r = (byte)(r * 255 / 31);
            op.g = (byte)(g * 255 / 63);
            op.b = (byte)(b * 255 / 31);
        }
示例#3
0
        private void DecompressDXT1()
        {
            // DXT1 decompressor
            Colour8888[] colours = new Colour8888[4];

            ushort colour0, colour1;
            uint bitmask, offset;
            int i, j, k, x, y, z, Select;

            MemoryStream mem = new MemoryStream(this.compdata.Length);
            mem.Write(this.compdata, 0, this.compdata.Length);
            mem.Seek(0, SeekOrigin.Begin);
            BinaryReader r = new BinaryReader(mem);

            colours[0].a = 255;
            colours[1].a = 255;
            colours[2].a = 255;

            for (z=0; z<this.depth; z++) {
                for (y=0; y<this.height; y+=4) {
                    for (x=0; x<this.width; x+=4) {
                        colour0 = r.ReadUInt16();
                        colour1 = r.ReadUInt16();

                        this.ReadColour(colour0, ref colours[0]);
                        this.ReadColour(colour1, ref colours[1]);

                        bitmask = r.ReadUInt32();

                        if (colour0 > colour1) {
                            // Four-color block: derive the other two colors.
                            // 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
                            // These 2-bit codes correspond to the 2-bit fields
                            // stored in the 64-bit block.
                            colours[2].b = (byte)((2 * colours[0].b + colours[1].b + 1) / 3);
                            colours[2].g = (byte)((2 * colours[0].g + colours[1].g + 1) / 3);
                            colours[2].r = (byte)((2 * colours[0].r + colours[1].r + 1) / 3);

                            colours[3].b = (byte)((colours[0].b + 2 * colours[1].b + 1) / 3);
                            colours[3].g = (byte)((colours[0].g + 2 * colours[1].g + 1) / 3);
                            colours[3].r = (byte)((colours[0].r + 2 * colours[1].r + 1) / 3);
                            colours[3].a = 0xFF;
                        } else {
                            // Three-color block: derive the other color.
                            // 00 = color_0,  01 = color_1,  10 = color_2,
                            // 11 = transparent.
                            // These 2-bit codes correspond to the 2-bit fields
                            // stored in the 64-bit block.
                            colours[2].b = (byte)((colours[0].b + colours[1].b) / 2);
                            colours[2].g = (byte)((colours[0].g + colours[1].g) / 2);
                            colours[2].r = (byte)((colours[0].r + colours[1].r) / 2);

                            colours[3].b = 0;
                            colours[3].g = 0;
                            colours[3].r = 0;
                            colours[3].a = 0;
                        }

                        for (j = 0, k = 0; j < 4; j++) {
                            for (i = 0; i < 4; i++, k++) {
                                Select = (int)((bitmask & (0x03 << k*2)) >> k*2);
                                if (((x + i) < this.width) && ((y + j) < this.height)) {
                                    offset = (uint)(z * this.sizeofplane + (y + j) * this.bps + (x + i) * this.bpp);
                                    this.rawidata[offset] = (byte)colours[Select].r;
                                    this.rawidata[offset + 1] = (byte)colours[Select].g;
                                    this.rawidata[offset + 2] = (byte)colours[Select].b;
                                    this.rawidata[offset + 3] = (byte)colours[Select].a;
                                }
                            }
                        }

                    }
                }
            }
        }