GARbro-mirror/ArcFormats/Circus/ImageCRX.cs

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//! \file ImageCRX.cs
//! \date Mon Jun 15 15:14:59 2015
//! \brief Circus image format.
//
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// Copyright (C) 2015-2016 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;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
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using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Circus
{
internal class CrxMetaData : ImageMetaData
{
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public int Compression;
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public int CompressionFlags;
public int Colors;
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public int Mode;
}
[Export(typeof(ImageFormat))]
public class CrxFormat : ImageFormat
{
public override string Tag { get { return "CRX"; } }
public override string Description { get { return "Circus image format"; } }
public override uint Signature { get { return 0x47585243; } } // 'CRXG'
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public override ImageMetaData ReadMetaData (IBinaryStream stream)
{
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var header = stream.ReadHeader (0x14);
int compression = header.ToUInt16 (0xC);
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if (compression < 1 || compression > 3)
return null;
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int depth = header.ToInt16 (0x10);
var info = new CrxMetaData
{
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Width = header.ToUInt16 (8),
Height = header.ToUInt16 (10),
OffsetX = header.ToInt16 (4),
OffsetY = header.ToInt16 (6),
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BPP = 0 == depth ? 24 : 1 == depth ? 32 : 8,
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Compression = compression,
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CompressionFlags = header.ToUInt16 (0xE),
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Colors = depth,
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Mode = header.ToUInt16 (0x12),
};
return info;
}
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
{
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using (var reader = new Reader (stream, (CrxMetaData)info))
{
reader.Unpack();
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return ImageData.Create (info, reader.Format, reader.Palette, reader.Data, reader.Stride);
}
}
public override void Write (Stream file, ImageData image)
{
throw new NotImplementedException ("CrxFormat.Write not implemented");
}
internal sealed class Reader : IDisposable
{
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IBinaryStream m_input;
byte[] m_output;
int m_width;
int m_height;
int m_stride;
int m_bpp;
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int m_compression;
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int m_flags;
int m_mode;
public byte[] Data { get { return m_output; } }
public PixelFormat Format { get; private set; }
public BitmapPalette Palette { get; private set; }
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public int Stride { get { return m_stride; } }
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public Reader (IBinaryStream input, CrxMetaData info)
{
m_width = (int)info.Width;
m_height = (int)info.Height;
m_bpp = info.BPP;
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m_compression = info.Compression;
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m_flags = info.CompressionFlags;
m_mode = info.Mode;
switch (m_bpp)
{
case 24: Format = PixelFormats.Bgr24; break;
case 32: Format = PixelFormats.Bgra32; break;
case 8: Format = PixelFormats.Indexed8; break;
default: throw new InvalidFormatException();
}
m_stride = (m_width * m_bpp / 8 + 3) & ~3;
m_output = new byte[m_height*m_stride];
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m_input = input;
m_input.Position = 0x14;
if (8 == m_bpp)
ReadPalette (info.Colors);
}
private void ReadPalette (int colors)
{
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int color_size = 0x102 == colors ? 4 : 3;
if (colors > 0x100)
{
colors = 0x100;
}
int palette_size = colors * color_size;
var palette_data = new byte[palette_size];
if (palette_size != m_input.Read (palette_data, 0, palette_size))
throw new InvalidFormatException();
var palette = new Color[colors];
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int color_pos = 0;
for (int i = 0; i < palette.Length; ++i)
{
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byte r = palette_data[color_pos];
byte g = palette_data[color_pos+1];
byte b = palette_data[color_pos+2];
if (0xff == b && 0 == g && 0xff == r)
g = 0xff;
palette[i] = Color.FromRgb (r, g, b);
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color_pos += color_size;
}
Palette = new BitmapPalette (palette);
}
public void Unpack (bool is_diff = false)
{
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if (m_compression >= 3)
{
int count = m_input.ReadInt32();
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m_input.Seek (count * 0x10, SeekOrigin.Current);
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}
if (0 != (m_flags & 0x10))
{
m_input.ReadInt32(); // compressed_size
}
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if (1 == m_compression)
UnpackV1();
else
UnpackV2();
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if (32 == m_bpp && m_mode != 1)
{
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int alpha_flip = 2 == m_mode ? 0 : 0xFF;
int line = 0;
for (int h = 0; h < m_height; h++)
{
int shift = (h & 1) * 3;
for (int w = 0; w < m_width; w++)
{
int pixel = line + w * 4;
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int alpha = m_output[pixel];
int b = m_output[pixel+1];
int g = m_output[pixel+2];
int r = m_output[pixel+3];
if (!is_diff && alpha != alpha_flip)
{
b += (w & 1) + shift;
if (b < 0)
b = 0;
else if (b > 0xff)
b = 0xff;
g += (w & 1) + shift;
if (g < 0)
g = 0;
else if (g > 0xff)
g = 0xff;
r += (w & 1) + shift;
if (r < 0)
r = 0;
else if (r > 0xff)
r = 0xff;
}
m_output[pixel] = (byte)b;
m_output[pixel+1] = (byte)g;
m_output[pixel+2] = (byte)r;
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m_output[pixel+3] = (byte)(alpha ^ alpha_flip);
shift = -shift;
}
line += m_stride;
}
}
else if (24 == m_bpp)
{
int pixel = 0;
for (int h = 0; h < m_height; h++)
{
int shift = (h & 1) * 3;
for (int w = 0; w < m_width; w++)
{
int b = m_output[pixel];
int g = m_output[pixel+1];
int r = m_output[pixel+2];
if (b != 0xff || 0 != g || r != b)
{
b += (w & 1) + shift;
if (b < 0)
b = 0;
else if (b > 0xff)
b = 0xff;
g += (w & 1) + shift;
if (g < 0)
g = 0;
else if (g > 0xff)
g = 0xff;
r += (w & 1) + shift;
if (r < 0)
r = 0;
else if (r > 0xff)
r = 0xff;
m_output[pixel] = (byte)b;
m_output[pixel+1] = (byte)g;
m_output[pixel+2] = (byte)r;
}
shift = -shift;
pixel += 3;
}
}
}
}
private void UnpackV1 ()
{
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byte[] window = new byte[0x10000];
int flag = 0;
int win_pos = 0;
int dst = 0;
while (dst < m_output.Length)
{
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flag >>= 1;
if (0 == (flag & 0x100))
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flag = m_input.ReadUInt8() | 0xff00;
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if (0 != (flag & 1))
{
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byte dat = m_input.ReadUInt8();
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window[win_pos++] = dat;
win_pos &= 0xffff;
m_output[dst++] = dat;
}
else
{
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byte control = m_input.ReadUInt8();
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int count, offset;
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if (control >= 0xc0)
{
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offset = ((control & 3) << 8) | m_input.ReadUInt8();
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count = 4 + ((control >> 2) & 0xf);
}
else if (0 != (control & 0x80))
{
offset = control & 0x1f;
count = 2 + ((control >> 5) & 3);
if (0 == offset)
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offset = m_input.ReadUInt8();
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}
else if (0x7f == control)
{
count = 2 + m_input.ReadUInt16();
offset = m_input.ReadUInt16();
}
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else
{
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offset = m_input.ReadUInt16();
count = control + 4;
}
offset = win_pos - offset;
for (int k = 0; k < count && dst < m_output.Length; k++)
{
offset &= 0xffff;
byte dat = window[offset++];
window[win_pos++] = dat;
win_pos &= 0xffff;
m_output[dst++] = dat;
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}
}
}
}
private void UnpackV2 ()
{
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int pixel_size = m_bpp / 8;
int src_stride = m_width * pixel_size;
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using (var zlib = new ZLibStream (m_input.AsStream, CompressionMode.Decompress, true))
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using (var src = new BinaryReader (zlib))
{
if (m_bpp >= 24)
{
for (int y = 0; y < m_height; ++y)
{
byte ctl = src.ReadByte();
int dst = y * m_stride;
int prev_row = dst - m_stride;
switch (ctl)
{
case 0:
src.Read (m_output, dst, pixel_size);
for (int x = pixel_size; x < src_stride; ++x)
m_output[dst+x] = (byte)(src.ReadByte() + m_output[dst+x - pixel_size]);
break;
case 1:
for (int x = 0; x < src_stride; ++x)
m_output[dst+x] = (byte)(src.ReadByte() + m_output[prev_row+x]);
break;
case 2:
src.Read (m_output, dst, pixel_size);
for (int x = pixel_size; x < src_stride; ++x)
m_output[dst+x] = (byte)(src.ReadByte() + m_output[prev_row+x - pixel_size]);
break;
case 3:
for (int x = src_stride - pixel_size; x > 0; --x)
m_output[dst++] = (byte)(src.ReadByte() + m_output[prev_row++ + pixel_size]);
src.Read (m_output, dst, pixel_size);
break;
case 4:
for (int i = 0; i < pixel_size; ++i)
{
int w = m_width;
byte val = src.ReadByte();
while (w > 0)
{
m_output[dst] = val;
dst += pixel_size;
if (0 == --w)
break;
byte next = src.ReadByte();
if (val == next)
{
int count = src.ReadByte();
for (int j = 0; j < count; ++j)
{
m_output[dst] = val;
dst += pixel_size;
}
w -= count;
if (w > 0)
val = src.ReadByte();
}
else
val = next;
}
dst -= src_stride - 1;
}
break;
default:
break;
}
}
}
else
{
int dst = 0;
for (int y = 0; y < m_height; ++y)
{
src.Read (m_output, dst, src_stride);
dst += m_stride;
}
}
}
}
#region IDisposable Members
public void Dispose ()
{
}
#endregion
}
}
}