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https://github.com/crskycode/GARbro.git
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209 lines
7.5 KiB
C#
209 lines
7.5 KiB
C#
//! \file DxtDecoder.cs
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//! \date Fri Apr 14 07:34:50 2017
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//! \brief DXT decompressor.
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//
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// Copyright (C) 2016-2017 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using GameRes.Utility;
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namespace GameRes.Formats.DirectDraw
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{
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public class DxtDecoder
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{
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byte[] m_input;
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byte[] m_output;
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int m_width;
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int m_height;
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int m_output_stride;
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public DxtDecoder (byte[] input, ImageMetaData info)
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{
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m_input = input;
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m_width = (int)info.Width;
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m_output_stride = m_width * 4;
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m_height = (int)info.Height;
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m_output = new byte[m_output_stride*m_height];
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}
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public byte[] UnpackDXT1 ()
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{
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int src = 0;
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for (int y = 0; y < m_height; y += 4)
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for (int x = 0; x < m_width; x += 4)
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{
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DecompressDXT1Block (m_input, src, y, x);
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src += 8;
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}
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return m_output;
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}
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public byte[] UnpackDXT5 ()
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{
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int src = 0;
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for (int y = 0; y < m_height; y += 4)
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for (int x = 0; x < m_width; x += 4)
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{
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DecompressDXT5Block (m_input, src, y, x);
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src += 16;
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}
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return m_output;
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}
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byte[] m_dxt_buffer = new byte[16];
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void DecompressDXT1Block (byte[] input, int src, int block_y, int block_x)
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{
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ReadDXT1Color (input, src, 0);
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ReadDXT1Color (input, src+2, 4);
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bool has_alpha = m_dxt_buffer[0] <= m_dxt_buffer[4]
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&& m_dxt_buffer[1] <= m_dxt_buffer[5]
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&& m_dxt_buffer[2] <= m_dxt_buffer[6];
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for (int i = 0; i < 4; ++i)
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{
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if (has_alpha)
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{
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m_dxt_buffer[8+i] = (byte)((m_dxt_buffer[i] + m_dxt_buffer[4+i]) >> 1);
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m_dxt_buffer[12+i] = 0;
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}
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else
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{
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m_dxt_buffer[8+i] = (byte)(((m_dxt_buffer[i] << 1) + m_dxt_buffer[4+i]) / 3);
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m_dxt_buffer[12+i] = (byte)(((m_dxt_buffer[4+i] << 1) + m_dxt_buffer[i]) / 3);
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}
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}
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uint map = LittleEndian.ToUInt32 (input, src+4);
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for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
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for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
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{
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int color = (int)(map & 3) << 2;
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int dst = m_output_stride * (block_y + y) + (block_x + x) * 4;
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m_output[dst] = m_dxt_buffer[color];
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m_output[dst+1] = m_dxt_buffer[color+1];
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m_output[dst+2] = m_dxt_buffer[color+2];
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m_output[dst+3] = m_dxt_buffer[color+3];
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map >>= 2;
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}
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}
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void ReadDXT1Color (byte[] input, int src, int idx)
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{
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int b = input[src] & 0x1F;
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int g = (input[src] >> 5 | input[src+1] << 3) & 0x3F;
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int r = input[src+1] >> 3;
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m_dxt_buffer[idx ] = (byte)(b << 3 | b >> 2);
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m_dxt_buffer[idx+1] = (byte)(g << 2 | g >> 4);
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m_dxt_buffer[idx+2] = (byte)(r << 3 | r >> 2);
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m_dxt_buffer[idx+3] = 0xFF;
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}
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void DecompressDXT5Block (byte[] input, int src, int block_y, int block_x)
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{
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byte alpha0 = input[src];
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byte alpha1 = input[src+1];
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DecompressDXT5Alpha (input, src+2, m_dxt_buffer);
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ushort color0 = LittleEndian.ToUInt16 (input, src+8);
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ushort color1 = LittleEndian.ToUInt16 (input, src+10);
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int t = (color0 >> 11) * 255 + 16;
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byte r0 = (byte)((t / 32 + t) / 32);
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t = ((color0 & 0x07E0) >> 5) * 255 + 32;
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byte g0 = (byte)((t / 64 + t) / 64);
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t = (color0 & 0x001F) * 255 + 16;
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byte b0 = (byte)((t / 32 + t) / 32);
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t = (color1 >> 11) * 255 + 16;
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byte r1 = (byte)((t / 32 + t) / 32);
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t = ((color1 & 0x07E0) >> 5) * 255 + 32;
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byte g1 = (byte)((t / 64 + t) / 64);
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t = (color1 & 0x001F) * 255 + 16;
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byte b1 = (byte)((t / 32 + t) / 32);
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uint code = LittleEndian.ToUInt32 (input, src+12);
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for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
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for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
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{
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int alpha_code = m_dxt_buffer[4 * y + x];
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byte alpha;
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if (0 == alpha_code)
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alpha = alpha0;
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else if (1 == alpha_code)
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alpha = alpha1;
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else if (alpha0 > alpha1)
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alpha = (byte)(((8 - alpha_code) * alpha0 + (alpha_code - 1) * alpha1) / 7);
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else if (6 == alpha_code)
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alpha = 0;
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else if (7 == alpha_code)
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alpha = 0xFF;
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else
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alpha = (byte)(((6 - alpha_code) * alpha0 + (alpha_code - 1) * alpha1) / 5);
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int dst = m_output_stride * (block_y + y) + (block_x + x) * 4;
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switch (code & 3)
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{
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case 0:
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PutPixel (dst, r0, g0, b0, alpha);
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break;
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case 1:
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PutPixel (dst, r1, g1, b1, alpha);
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break;
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case 2:
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PutPixel (dst, (byte)((2 * r0 + r1) / 3), (byte)((2 * g0 + g1) / 3), (byte)((2 * b0 + b1) / 3), alpha);
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break;
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case 3:
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PutPixel (dst, (byte)((r0 + 2 * r1) / 3), (byte)((g0 + 2 * g1) / 3), (byte)((b0 + 2 * b1) / 3), alpha);
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break;
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}
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code >>= 2;
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}
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}
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static void DecompressDXT5Alpha (byte[] input, int src, byte[] output)
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{
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int dst = 0;
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for (int j = 0; j < 2; ++j)
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{
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int block = input[src++];
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block |= input[src++] << 8;
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block |= input[src++] << 16;
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for (int i = 0; i < 8; ++i)
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{
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output[dst++] = (byte)(block & 7);
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block >>= 3;
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}
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}
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}
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void PutPixel (int dst, byte r, byte g, byte b, byte a)
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{
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m_output[dst] = b;
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m_output[dst+1] = g;
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m_output[dst+2] = r;
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m_output[dst+3] = a;
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}
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}
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}
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