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119 lines
4.2 KiB
C#
119 lines
4.2 KiB
C#
//! \file QoiCodec.cs
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//! \date Sun Apr 12 2026
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//! \brief Quite OK Image Format
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//
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// Copyright (C) 2016 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 System.IO;
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namespace GameRes.Formats.QoiCodec
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{
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static class QoiConst
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{
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public const int Index = 0x00;
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public const int Diff = 0x40;
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public const int Luma = 0x80;
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public const int Run = 0xC0;
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public const int Rgb = 0xFE;
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public const int Rgba = 0xFF;
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public const int Mask2 = 0xC0;
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public const int HashTableSize = 64;
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}
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public class QoiDecodeStream
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{
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readonly IBinaryStream m_input;
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readonly byte[] m_table;
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uint m_pixel;
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public QoiDecodeStream (IBinaryStream input)
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{
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m_input = input;
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m_table = new byte [4*QoiConst.HashTableSize];
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m_pixel = 0xFF000000;
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}
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public int Read (out uint output)
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{
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var r = (byte)m_pixel;
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var g = (byte)(m_pixel >> 8);
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var b = (byte)(m_pixel >> 16);
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var a = (byte)(m_pixel >> 24);
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var run = 1;
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var b1 = m_input.ReadByte ();
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if (-1 == b1)
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throw new EndOfStreamException ();
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if (QoiConst.Rgb == b1)
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{
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var rgb = m_input.ReadInt24 ();
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r = (byte)rgb;
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g = (byte)(rgb >> 8);
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b = (byte)(rgb >> 16);
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}
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else if (QoiConst.Rgba == b1)
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{
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var rgba = m_input.ReadInt32 ();
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r = (byte)rgba;
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g = (byte)(rgba >> 8);
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b = (byte)(rgba >> 16);
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a = (byte)(rgba >> 24);
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}
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else if (QoiConst.Index == (b1 & QoiConst.Mask2))
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{
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var p1 = (b1 & ~QoiConst.Mask2) * 4;
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r = m_table[p1 ];
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g = m_table[p1+1];
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b = m_table[p1+2];
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a = m_table[p1+3];
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}
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else if (QoiConst.Diff == (b1 & QoiConst.Mask2))
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{
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r += (byte)(((b1 >> 4) & 0x03) - 2);
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g += (byte)(((b1 >> 2) & 0x03) - 2);
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b += (byte)((b1 & 0x03) - 2);
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}
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else if (QoiConst.Luma == (b1 & QoiConst.Mask2))
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{
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var b2 = m_input.ReadByte ();
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if (-1 == b2)
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throw new EndOfStreamException ();
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var vg = (b1 & 0x3F) - 32;
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r += (byte)(vg - 8 + ((b2 >> 4) & 0x0F));
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g += (byte)vg;
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b += (byte)(vg - 8 + (b2 & 0x0F));
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}
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else if (QoiConst.Run == (b1 & QoiConst.Mask2))
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{
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run = (b1 & 0x3F) + 1;
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}
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var p2 = (r*3 + g*5 + b*7 + a*11) % QoiConst.HashTableSize*4;
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m_table[p2 ] = r;
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m_table[p2+1] = g;
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m_table[p2+2] = b;
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m_table[p2+3] = a;
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m_pixel = (uint)(r | (g << 8) | (b << 16) | (a << 24));
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output = (uint)(b | (g << 8) | (r << 16) | (a << 24));
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return run;
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}
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}
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}
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