GARbro-mirror/Legacy/Liddell/ImageBPA.cs

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2019-03-13 16:53:29 +08:00
//! \file ImageBPA.cs
//! \date 2019 Mar 12
//! \brief Liddell image format.
//
// Copyright (C) 2019 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 System.Windows.Media.Imaging;
namespace GameRes.Formats.Liddell
{
internal class BpaMetaData : ImageMetaData
{
public int Colors;
public int PaletteOffset;
public int DataOffset;
}
[Export(typeof(ImageFormat))]
public class BpaFormat : ImageFormat
{
public override string Tag { get { return "BPA"; } }
public override string Description { get { return "Liddell image format"; } }
public override uint Signature { get { return 0x4150422D; } } // '-BPA-'
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x11);
if (header[4] != '-')
return null;
int palette_offset = header.ToUInt16 (0xC);
return new BpaMetaData {
Width = header.ToUInt16 (6),
Height = header.ToUInt16 (8),
BPP = 0 == palette_offset ? header[0x10] * 8 : 8,
Colors = header.ToUInt16 (0xA),
PaletteOffset = palette_offset,
DataOffset = header.ToUInt16 (0xE),
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var reader = new BpaDecoder (file, (BpaMetaData)info);
return reader.Unpack();
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("BpaFormat.Write not implemented");
}
}
internal class BpaDecoder
{
IBinaryStream m_input;
BpaMetaData m_info;
int m_alignedWidth;
public BpaDecoder (IBinaryStream input, BpaMetaData info)
{
m_input = input;
m_info = info;
m_alignedWidth = 4 * ((m_info.iWidth - 1) / 4 + 1);
}
public ImageData Unpack ()
{
BitmapPalette palette = null;
if (m_info.PaletteOffset != 0)
{
m_input.Position = m_info.PaletteOffset;
palette = ImageFormat.ReadPalette (m_input.AsStream, m_info.Colors, PaletteFormat.Rgb);
}
m_input.Position = m_info.DataOffset;
int stride = m_alignedWidth * m_info.BPP / 8;
var pixels = new byte[stride * m_info.iHeight];
int channels = m_info.BPP / 8;
var channel = pixels;
if (channels > 1)
channel = new byte[m_alignedWidth * m_info.iHeight];
for (int i = 0; i < channels; ++i)
{
Decompress (channel);
if (channels > 1)
{
int dst_row = i;
int src_row = channel.Length - m_alignedWidth;
for (int y = 0; y < m_info.iHeight; ++y)
{
int dst = dst_row;
int src = src_row;
for (int x = 0; x < m_alignedWidth; ++x)
{
pixels[dst] = channel[src++];
dst += channels;
}
dst_row += stride;
src_row -= m_alignedWidth;
}
m_input.ReadByte();
}
}
if (8 == m_info.BPP)
return ImageData.Create (m_info, PixelFormats.Indexed8, palette, pixels, m_alignedWidth);
PixelFormat format = 24 == m_info.BPP ? PixelFormats.Bgr24 : PixelFormats.Bgra32;
stride = ((m_info.iWidth * m_info.BPP / 8) + 3) & ~3;
return ImageData.CreateFlipped (m_info, format, palette, pixels, stride);
}
void Decompress (byte[] output)
{
m_pixelStack[0] = 0;
m_pixelStack[4] = 0;
m_pixelStack[5] = 0;
int dst = 0;
for (int y = 0; y < m_info.iHeight; ++y)
{
byte ctlBits = 0;
int ctlCount = 0;
int w = m_alignedWidth;
while (w > 0)
{
if (0 == ctlCount)
{
ctlCount = 4;
ctlBits = m_input.ReadUInt8();
}
int chunk_size = Math.Min (w, 16);
switch ((ctlBits >> 6) & 3)
{
case 0:
m_input.Read (output, dst, chunk_size);
dst += chunk_size;
break;
case 1:
{
byte val = m_input.ReadUInt8();
chunk_size = m_input.ReadUInt8();
for (int i = 0; i < chunk_size; ++i)
{
output[dst++] = val;
}
StorePixel (val);
break;
}
case 2:
{
ushort ctl = m_input.ReadUInt16();
byte val = m_input.ReadUInt8();
for (int i = 0; i < chunk_size; ++i)
{
if ((ctl & 0x8000) != 0)
output[dst++] = val;
else
output[dst++] = m_input.ReadUInt8();
ctl <<= 1;
}
StorePixel (val);
break;
}
case 3:
{
m_bitCount = 0;
for (int i = 0; i < chunk_size; ++i)
{
output[dst++] = RestorePixel();
}
if (m_bitCount != 8)
m_input.ReadByte();
break;
}
}
w -= chunk_size;
--ctlCount;
ctlBits <<= 2;
}
}
}
byte[] m_pixelStack = new byte[6];
void StorePixel (byte val)
{
int i;
for (i = 0; i < 5; ++i)
{
if (m_pixelStack[i] == val)
break;
}
if (i == 0)
return;
do
{
m_pixelStack[i] = m_pixelStack[i-1];
}
while (--i > 0);
m_pixelStack[0] = val;
}
byte RestorePixel ()
{
byte bits = GetNextBit (0);
if (0 == bits)
return m_pixelStack[0];
byte result = 0;
int count = 0;
bits = GetNextBit (bits);
if (2 == bits)
{
result = m_pixelStack[1];
count = 1;
}
else if (GetNextBit (bits) == 6)
{
bits = GetNextBit (0);
switch (GetNextBit (bits))
{
case 0: count = 2; break;
case 1: count = 3; break;
case 2: count = 4; break;
case 3: count = 5; break;
}
result = m_pixelStack[count];
}
else
{
for (int i = 0; i < 8; ++i)
{
result = GetNextBit (result);
}
count = 5;
}
for (int i = count; i > 0; --i)
m_pixelStack[i] = m_pixelStack[i-1];
m_pixelStack[0] = result;
return result;
}
int m_bitCount;
byte m_curBits;
byte GetNextBit (byte prev)
{
if (m_bitCount == 0)
m_curBits = m_input.ReadUInt8();
int result = prev << 1 | m_curBits >> 7;
m_curBits <<= 1;
if (++m_bitCount >= 8)
m_bitCount = 0;
return (byte)result;
}
}
}