lifegpc/GARbro-crskycode
1
0
Fork 0
mirror of https://github.com/crskycode/GARbro.git synced 2026-07-08 01:30:18 +08:00
Code Issues Packages Projects Releases Wiki Activity

Extract QoiCodec

Browse Source
This commit is contained in:
Crsky
2026-04-12 18:58:42 +08:00
parent 6cff1b96d4
commit bf8e146139
4 changed files with 121 additions and 180 deletions
Download Patch File Download Diff File Expand all files Collapse all files

92
ArcFormats/YuRis/ImageYDG.cs
View File

@@ -30,6 +30,7 @@ using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Media;
using GameRes.Formats.QoiCodec;
using GameRes.Utility;
namespace GameRes.Formats.YuRis
@@ -233,96 +234,5 @@ namespace GameRes.Formats.YuRis
return output;
}
}
static class QoiCodec
{
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;
}
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 * QoiCodec.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 (QoiCodec.Rgb == b1)
{
var rgb = m_input.ReadInt24();
r = (byte)rgb;
g = (byte)(rgb >> 8);
b = (byte)(rgb >> 16);
}
else if (QoiCodec.Rgba == b1)
{
var rgba = m_input.ReadInt32();
r = (byte)rgba;
g = (byte)(rgba >> 8);
b = (byte)(rgba >> 16);
a = (byte)(rgba >> 24);
}
else if (QoiCodec.Index == (b1 & QoiCodec.Mask2))
{
var p1 = (b1 & ~QoiCodec.Mask2) * 4;
r = m_table[p1];
g = m_table[p1 + 1];
b = m_table[p1 + 2];
a = m_table[p1 + 3];
}
else if (QoiCodec.Diff == (b1 & QoiCodec.Mask2))
{
r += (byte)(((b1 >> 4) & 0x03) - 2);
g += (byte)(((b1 >> 2) & 0x03) - 2);
b += (byte)((b1 & 0x03) - 2);
}
else if (QoiCodec.Luma == (b1 & QoiCodec.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 (QoiCodec.Run == (b1 & QoiCodec.Mask2))
{
run = (b1 & 0x3F) + 1;
}
var p2 = (r * 3 + g * 5 + b * 7 + a * 11) % QoiCodec.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;
}
}
}
}