444 lines
14 KiB
C#
444 lines
14 KiB
C#
// #region License
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// /*
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// Microsoft Public License (Ms-PL)
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// MonoGame - Copyright © 2009 The MonoGame Team
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//
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// All rights reserved.
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//
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// This license governs use of the accompanying software. If you use the software, you accept this license. If you do not
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// accept the license, do not use the software.
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//
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// 1. Definitions
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// The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning here as under
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// U.S. copyright law.
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//
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// A "contribution" is the original software, or any additions or changes to the software.
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// A "contributor" is any person that distributes its contribution under this license.
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// "Licensed patents" are a contributor's patent claims that read directly on its contribution.
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//
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// 2. Grant of Rights
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// (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations in section 3,
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// each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution or any derivative works that you create.
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// (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in section 3,
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// each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution in the software or derivative works of the contribution in the software.
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//
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// 3. Conditions and Limitations
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// (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
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// (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software,
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// your patent license from such contributor to the software ends automatically.
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// (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution
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// notices that are present in the software.
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// (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
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// a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or object
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// code form, you may only do so under a license that complies with this license.
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// (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees
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// or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the extent
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// permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a particular
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// purpose and non-infringement.
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// */
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// #endregion License
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//
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using System;
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using System.IO;
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namespace Microsoft.Xna.Framework.Graphics
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{
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internal static class DxtUtil
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{
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internal static byte[] DecompressDxt1(byte[] imageData, int width, int height)
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{
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using (MemoryStream imageStream = new MemoryStream(imageData))
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return DecompressDxt1(imageStream, width, height);
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}
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internal static byte[] DecompressDxt1(Stream imageStream, int width, int height)
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{
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byte[] imageData = new byte[width * height * 4];
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using (BinaryReader imageReader = new BinaryReader(imageStream))
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{
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int blockCountX = (width + 3) / 4;
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int blockCountY = (height + 3) / 4;
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for (int y = 0; y < blockCountY; y++)
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{
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for (int x = 0; x < blockCountX; x++)
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{
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DecompressDxt1Block(imageReader, x, y, blockCountX, width, height, imageData);
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}
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}
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}
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return imageData;
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}
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private static void DecompressDxt1Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData)
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{
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ushort c0 = imageReader.ReadUInt16();
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ushort c1 = imageReader.ReadUInt16();
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byte r0, g0, b0;
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byte r1, g1, b1;
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ConvertRgb565ToRgb888(c0, out r0, out g0, out b0);
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ConvertRgb565ToRgb888(c1, out r1, out g1, out b1);
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uint lookupTable = imageReader.ReadUInt32();
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for (int blockY = 0; blockY < 4; blockY++)
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{
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for (int blockX = 0; blockX < 4; blockX++)
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{
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byte r = 0, g = 0, b = 0, a = 255;
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uint index = (lookupTable >> 2 * (4 * blockY + blockX)) & 0x03;
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if (c0 > c1)
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{
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switch (index)
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{
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case 0:
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r = r0;
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g = g0;
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b = b0;
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break;
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case 1:
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r = r1;
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g = g1;
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b = b1;
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break;
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case 2:
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r = (byte)((2 * r0 + r1) / 3);
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g = (byte)((2 * g0 + g1) / 3);
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b = (byte)((2 * b0 + b1) / 3);
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break;
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case 3:
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r = (byte)((r0 + 2 * r1) / 3);
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g = (byte)((g0 + 2 * g1) / 3);
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b = (byte)((b0 + 2 * b1) / 3);
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break;
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}
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}
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else
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{
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switch (index)
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{
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case 0:
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r = r0;
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g = g0;
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b = b0;
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break;
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case 1:
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r = r1;
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g = g1;
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b = b1;
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break;
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case 2:
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r = (byte)((r0 + r1) / 2);
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g = (byte)((g0 + g1) / 2);
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b = (byte)((b0 + b1) / 2);
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break;
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case 3:
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r = 0;
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g = 0;
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b = 0;
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a = 0;
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break;
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}
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}
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int px = (x << 2) + blockX;
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int py = (y << 2) + blockY;
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if ((px < width) && (py < height))
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{
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int offset = ((py * width) + px) << 2;
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imageData[offset] = r;
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imageData[offset + 1] = g;
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imageData[offset + 2] = b;
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imageData[offset + 3] = a;
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}
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}
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}
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}
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internal static byte[] DecompressDxt3(byte[] imageData, int width, int height)
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{
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using (MemoryStream imageStream = new MemoryStream(imageData))
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return DecompressDxt3(imageStream, width, height);
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}
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internal static byte[] DecompressDxt3(Stream imageStream, int width, int height)
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{
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byte[] imageData = new byte[width * height * 4];
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using (BinaryReader imageReader = new BinaryReader(imageStream))
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{
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int blockCountX = (width + 3) / 4;
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int blockCountY = (height + 3) / 4;
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for (int y = 0; y < blockCountY; y++)
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{
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for (int x = 0; x < blockCountX; x++)
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{
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DecompressDxt3Block(imageReader, x, y, blockCountX, width, height, imageData);
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}
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}
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}
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return imageData;
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}
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private static void DecompressDxt3Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData)
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{
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byte a0 = imageReader.ReadByte();
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byte a1 = imageReader.ReadByte();
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byte a2 = imageReader.ReadByte();
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byte a3 = imageReader.ReadByte();
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byte a4 = imageReader.ReadByte();
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byte a5 = imageReader.ReadByte();
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byte a6 = imageReader.ReadByte();
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byte a7 = imageReader.ReadByte();
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ushort c0 = imageReader.ReadUInt16();
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ushort c1 = imageReader.ReadUInt16();
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byte r0, g0, b0;
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byte r1, g1, b1;
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ConvertRgb565ToRgb888(c0, out r0, out g0, out b0);
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ConvertRgb565ToRgb888(c1, out r1, out g1, out b1);
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uint lookupTable = imageReader.ReadUInt32();
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int alphaIndex = 0;
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for (int blockY = 0; blockY < 4; blockY++)
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{
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for (int blockX = 0; blockX < 4; blockX++)
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{
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byte r = 0, g = 0, b = 0, a = 0;
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uint index = (lookupTable >> 2 * (4 * blockY + blockX)) & 0x03;
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switch (alphaIndex)
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{
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case 0:
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a = (byte)((a0 & 0x0F) | ((a0 & 0x0F) << 4));
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break;
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case 1:
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a = (byte)((a0 & 0xF0) | ((a0 & 0xF0) >> 4));
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break;
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case 2:
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a = (byte)((a1 & 0x0F) | ((a1 & 0x0F) << 4));
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break;
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case 3:
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a = (byte)((a1 & 0xF0) | ((a1 & 0xF0) >> 4));
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break;
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case 4:
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a = (byte)((a2 & 0x0F) | ((a2 & 0x0F) << 4));
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break;
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case 5:
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a = (byte)((a2 & 0xF0) | ((a2 & 0xF0) >> 4));
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break;
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case 6:
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a = (byte)((a3 & 0x0F) | ((a3 & 0x0F) << 4));
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break;
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case 7:
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a = (byte)((a3 & 0xF0) | ((a3 & 0xF0) >> 4));
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break;
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case 8:
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a = (byte)((a4 & 0x0F) | ((a4 & 0x0F) << 4));
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break;
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case 9:
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a = (byte)((a4 & 0xF0) | ((a4 & 0xF0) >> 4));
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break;
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case 10:
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a = (byte)((a5 & 0x0F) | ((a5 & 0x0F) << 4));
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break;
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case 11:
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a = (byte)((a5 & 0xF0) | ((a5 & 0xF0) >> 4));
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break;
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case 12:
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a = (byte)((a6 & 0x0F) | ((a6 & 0x0F) << 4));
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break;
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case 13:
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a = (byte)((a6 & 0xF0) | ((a6 & 0xF0) >> 4));
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break;
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case 14:
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a = (byte)((a7 & 0x0F) | ((a7 & 0x0F) << 4));
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break;
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case 15:
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a = (byte)((a7 & 0xF0) | ((a7 & 0xF0) >> 4));
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break;
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}
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++alphaIndex;
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switch (index)
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{
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case 0:
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r = r0;
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g = g0;
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b = b0;
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break;
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case 1:
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r = r1;
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g = g1;
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b = b1;
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break;
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case 2:
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r = (byte)((2 * r0 + r1) / 3);
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g = (byte)((2 * g0 + g1) / 3);
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b = (byte)((2 * b0 + b1) / 3);
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break;
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case 3:
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r = (byte)((r0 + 2 * r1) / 3);
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g = (byte)((g0 + 2 * g1) / 3);
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b = (byte)((b0 + 2 * b1) / 3);
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break;
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}
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int px = (x << 2) + blockX;
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int py = (y << 2) + blockY;
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if ((px < width) && (py < height))
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{
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int offset = ((py * width) + px) << 2;
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imageData[offset] = r;
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imageData[offset + 1] = g;
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imageData[offset + 2] = b;
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imageData[offset + 3] = a;
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}
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}
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}
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}
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internal static byte[] DecompressDxt5(byte[] imageData, int width, int height)
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{
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using (MemoryStream imageStream = new MemoryStream(imageData))
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return DecompressDxt5(imageStream, width, height);
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}
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internal static byte[] DecompressDxt5(Stream imageStream, int width, int height)
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{
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byte[] imageData = new byte[width * height * 4];
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using (BinaryReader imageReader = new BinaryReader(imageStream))
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{
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int blockCountX = (width + 3) / 4;
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int blockCountY = (height + 3) / 4;
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for (int y = 0; y < blockCountY; y++)
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{
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for (int x = 0; x < blockCountX; x++)
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{
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DecompressDxt5Block(imageReader, x, y, blockCountX, width, height, imageData);
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}
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}
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}
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return imageData;
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}
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private static void DecompressDxt5Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData)
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{
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byte alpha0 = imageReader.ReadByte();
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byte alpha1 = imageReader.ReadByte();
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ulong alphaMask = (ulong)imageReader.ReadByte();
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alphaMask += (ulong)imageReader.ReadByte() << 8;
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alphaMask += (ulong)imageReader.ReadByte() << 16;
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alphaMask += (ulong)imageReader.ReadByte() << 24;
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alphaMask += (ulong)imageReader.ReadByte() << 32;
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alphaMask += (ulong)imageReader.ReadByte() << 40;
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ushort c0 = imageReader.ReadUInt16();
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ushort c1 = imageReader.ReadUInt16();
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byte r0, g0, b0;
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byte r1, g1, b1;
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ConvertRgb565ToRgb888(c0, out r0, out g0, out b0);
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ConvertRgb565ToRgb888(c1, out r1, out g1, out b1);
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uint lookupTable = imageReader.ReadUInt32();
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for (int blockY = 0; blockY < 4; blockY++)
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{
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for (int blockX = 0; blockX < 4; blockX++)
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{
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byte r = 0, g = 0, b = 0, a = 255;
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uint index = (lookupTable >> 2 * (4 * blockY + blockX)) & 0x03;
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uint alphaIndex = (uint)((alphaMask >> 3 * (4 * blockY + blockX)) & 0x07);
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if (alphaIndex == 0)
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{
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a = alpha0;
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}
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else if (alphaIndex == 1)
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{
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a = alpha1;
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}
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else if (alpha0 > alpha1)
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{
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a = (byte)(((8 - alphaIndex) * alpha0 + (alphaIndex - 1) * alpha1) / 7);
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}
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else if (alphaIndex == 6)
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{
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a = 0;
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}
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else if (alphaIndex == 7)
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{
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a = 0xff;
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}
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else
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{
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a = (byte)(((6 - alphaIndex) * alpha0 + (alphaIndex - 1) * alpha1) / 5);
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}
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switch (index)
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{
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case 0:
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r = r0;
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g = g0;
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b = b0;
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break;
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case 1:
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r = r1;
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g = g1;
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b = b1;
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break;
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case 2:
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r = (byte)((2 * r0 + r1) / 3);
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g = (byte)((2 * g0 + g1) / 3);
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b = (byte)((2 * b0 + b1) / 3);
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break;
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case 3:
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r = (byte)((r0 + 2 * r1) / 3);
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g = (byte)((g0 + 2 * g1) / 3);
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b = (byte)((b0 + 2 * b1) / 3);
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break;
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}
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int px = (x << 2) + blockX;
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int py = (y << 2) + blockY;
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if ((px < width) && (py < height))
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{
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int offset = ((py * width) + px) << 2;
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imageData[offset] = r;
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imageData[offset + 1] = g;
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imageData[offset + 2] = b;
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imageData[offset + 3] = a;
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}
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}
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}
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}
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private static void ConvertRgb565ToRgb888(ushort color, out byte r, out byte g, out byte b)
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{
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int temp;
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temp = (color >> 11) * 255 + 16;
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r = (byte)((temp / 32 + temp) / 32);
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temp = ((color & 0x07E0) >> 5) * 255 + 32;
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g = (byte)((temp / 64 + temp) / 64);
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temp = (color & 0x001F) * 255 + 16;
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b = (byte)((temp / 32 + temp) / 32);
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}
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}
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}
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