GARbro-mirror/Legacy/KeroQ/ImageKGD.cs
2018-08-23 23:56:39 +04:00

210 lines
7.6 KiB
C#

//! \file ImageKGD.cs
//! \date 2018 Aug 22
//! \brief KeroQ image format.
//
// Copyright (C) 2018 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;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using GameRes.Compression;
// [011130][KeroQ] Nijuubako
namespace GameRes.Formats.KeroQ
{
[Export(typeof(ImageFormat))]
public class KgdFormat : ImageFormat
{
public override string Tag { get { return "KGD"; } }
public override string Description { get { return "KeroQ image format"; } }
public override uint Signature { get { return 0x44474B89; } } // '\x89KGD'
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x19);
if (header.ToInt32 (4) != 0x10 || header[8] != 1)
return null;
return new ImageMetaData {
Width = header.ToUInt32 (9),
Height = header.ToUInt32 (0xD),
BPP = 2 == header[0x12] ? 24 : 32,
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
file.Position = 0x19;
using (var packed = new KgdStream (file))
using (var input = new ZLibStream (packed, CompressionMode.Decompress))
{
int stride = ((int)info.Width * info.BPP + 7) / 8;
int pixel_size = (info.BPP + 7) / 8;
var buffer = new byte[stride+1];
var prev_line = new byte[stride];
var pixels = new byte[stride * (int)info.Height];
int dst = 0;
for (uint i = 0; i < info.Height; ++i)
{
if (input.Read (buffer, 0, buffer.Length) == 0)
break;
switch (buffer[0])
{
case 1: // PNG_FILTER_VALUE_SUB
for (int j = pixel_size; j < stride; ++j)
{
buffer[1+j] += buffer[1+j-pixel_size];
}
break;
case 2: // PNG_FILTER_VALUE_UP
for (int j = 0; j < stride; ++j)
{
buffer[1+j] += prev_line[j];
}
break;
case 3: // PNG_FILTER_VALUE_AVG
for (int j = 0; j < pixel_size; ++j)
{
buffer[1+j] += (byte)(prev_line[j] >> 1);
}
for (int j = pixel_size; j < stride; ++j)
{
int v = (prev_line[j] + buffer[1+j-pixel_size]) >> 1;
buffer[1+j] += (byte)v;
}
break;
case 4: // PNG_FILTER_VALUE_PAETH
for (int j = 0; j < pixel_size; ++j)
{
buffer[1+j] += prev_line[j];
}
int src = 1;
for (int j = pixel_size; j < stride; ++j)
{
byte y = prev_line[j];
byte x = buffer[src++];
byte z = prev_line[j-pixel_size];
int yz = y - z;
int xz = x - z;
int ayz = Math.Abs (yz);
int axz = Math.Abs (xz);
int axy = Math.Abs (xz + yz);
if (!(ayz > axz || ayz > axy))
z = x;
else if (axz <= axy)
z = y;
buffer[1+j] += (byte)z;
}
break;
case 0:
break;
}
Buffer.BlockCopy (buffer, 1, prev_line, 0, stride);
Buffer.BlockCopy (buffer, 1, pixels, dst, stride);
dst += stride;
}
PixelFormat format = 24 == info.BPP ? PixelFormats.Bgr24 : PixelFormats.Bgr32;
return ImageData.Create (info, PixelFormats.Bgr24, null, pixels);
}
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("KgdFormat.Write not implemented");
}
}
internal class KgdStream : InputProxyStream
{
IBinaryStream m_input;
bool m_eof = false;
byte[] m_buffer = new byte[0x2000];
int m_buffer_pos = 0;
int m_buffer_size = 0;
public KgdStream (IBinaryStream input) : base (input.AsStream, true)
{
m_input = input;
}
public override bool CanSeek { get { return false; } }
public override int Read (byte[] buffer, int offset, int count)
{
int read = 0;
while (!m_eof && count > 0)
{
if (m_buffer_pos >= m_buffer_size)
{
FillBuffer();
continue;
}
int avail = Math.Min (count, m_buffer_size - m_buffer_pos);
Buffer.BlockCopy (m_buffer, m_buffer_pos, buffer, offset, avail);
m_buffer_pos += avail;
offset += avail;
count -= avail;
read += avail;
}
return read;
}
public override int ReadByte ()
{
if (m_eof)
return -1;
if (m_buffer_pos >= m_buffer_size)
{
FillBuffer();
if (m_eof)
return -1;
}
return m_buffer[m_buffer_pos++];
}
void FillBuffer ()
{
if (m_input.PeekByte() == -1)
{
m_eof = true;
return;
}
int chunk_size = m_input.ReadInt32();
int type = m_input.ReadByte();
if (type != 2)
{
m_eof = true;
return;
}
if (chunk_size > m_buffer.Length)
m_buffer = new byte[chunk_size];
m_buffer_size = m_input.Read (m_buffer, 0, chunk_size);
m_buffer_pos = 0;
}
}
}