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Extract QoiCodec

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Crsky
2026-04-12 18:58:42 +08:00
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commit bf8e146139
4 changed files with 121 additions and 180 deletions
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ArcFormats/QoiCodec.cs Normal file
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//! \file QoiCodec.cs
//! \date Sun Apr 12 2026
//! \brief Quite OK Image Format
//
// Copyright (C) 2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System.IO;
namespace GameRes.Formats.QoiCodec
{
static class QoiConst
{
public const int Index = 0x00;
public const int Diff = 0x40;
public const int Luma = 0x80;
public const int Run = 0xC0;
public const int Rgb = 0xFE;
public const int Rgba = 0xFF;
public const int Mask2 = 0xC0;
public const int HashTableSize = 64;
}
public class QoiDecodeStream
{
readonly IBinaryStream m_input;
readonly byte[] m_table;
uint m_pixel;
public QoiDecodeStream (IBinaryStream input)
{
m_input = input;
m_table = new byte [4*QoiConst.HashTableSize];
m_pixel = 0xFF000000;
}
public int Read (out uint output)
{
var r = (byte)m_pixel;
var g = (byte)(m_pixel >> 8);
var b = (byte)(m_pixel >> 16);
var a = (byte)(m_pixel >> 24);
var run = 1;
var b1 = m_input.ReadByte ();
if (-1 == b1)
throw new EndOfStreamException ();
if (QoiConst.Rgb == b1)
{
var rgb = m_input.ReadInt24 ();
r = (byte)rgb;
g = (byte)(rgb >> 8);
b = (byte)(rgb >> 16);
}
else if (QoiConst.Rgba == b1)
{
var rgba = m_input.ReadInt32 ();
r = (byte)rgba;
g = (byte)(rgba >> 8);
b = (byte)(rgba >> 16);
a = (byte)(rgba >> 24);
}
else if (QoiConst.Index == (b1 & QoiConst.Mask2))
{
var p1 = (b1 & ~QoiConst.Mask2) * 4;
r = m_table[p1 ];
g = m_table[p1+1];
b = m_table[p1+2];
a = m_table[p1+3];
}
else if (QoiConst.Diff == (b1 & QoiConst.Mask2))
{
r += (byte)(((b1 >> 4) & 0x03) - 2);
g += (byte)(((b1 >> 2) & 0x03) - 2);
b += (byte)((b1 & 0x03) - 2);
}
else if (QoiConst.Luma == (b1 & QoiConst.Mask2))
{
var b2 = m_input.ReadByte ();
if (-1 == b2)
throw new EndOfStreamException ();
var vg = (b1 & 0x3F) - 32;
r += (byte)(vg - 8 + ((b2 >> 4) & 0x0F));
g += (byte)vg;
b += (byte)(vg - 8 + (b2 & 0x0F));
}
else if (QoiConst.Run == (b1 & QoiConst.Mask2))
{
run = (b1 & 0x3F) + 1;
}
var p2 = (r*3 + g*5 + b*7 + a*11) % QoiConst.HashTableSize*4;
m_table[p2 ] = r;
m_table[p2+1] = g;
m_table[p2+2] = b;
m_table[p2+3] = a;
m_pixel = (uint)(r | (g << 8) | (b << 16) | (a << 24));
output = (uint)(b | (g << 8) | (r << 16) | (a << 24));
return run;
}
}
}