GARbro-mirror/ArcFormats/Gpk2/ImageGFB.cs
morkt 13cf289bae (ImageFormat.ReadPalette): new static methods.
Generalized image palette deserializations.
2017-01-14 16:27:11 +04:00

148 lines
5.1 KiB
C#

//! \file ImageGFB.cs
//! \date Sun Oct 25 13:06:47 2015
//! \brief GPK2 image resource.
//
// Copyright (C) 2015 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;
using GameRes.Compression;
namespace GameRes.Formats.Gpk2
{
internal class GfbMetaData : ImageMetaData
{
public int PackedSize;
public int UnpackedSize;
public int DataOffset;
}
[Export(typeof(ImageFormat))]
public class GfbFormat : ImageFormat
{
public override string Tag { get { return "GFB"; } }
public override string Description { get { return "GPK2 image format"; } }
public override uint Signature { get { return 0x20424647; } } // 'GFB '
public override ImageMetaData ReadMetaData (IBinaryStream stream)
{
var header = stream.ReadHeader (0x40);
return new GfbMetaData
{
Width = header.ToUInt32 (0x1C),
Height = header.ToUInt32 (0x20),
BPP = header.ToUInt16 (0x26),
PackedSize = header.ToInt32 (0x0C),
UnpackedSize = header.ToInt32 (0x10),
DataOffset = header.ToInt32 (0x14),
};
}
public override ImageData Read (IBinaryStream stream, ImageMetaData info)
{
var meta = (GfbMetaData)info;
BitmapPalette palette = null;
if (8 == meta.BPP && meta.DataOffset != 0x40)
{
stream.Position = 0x40;
palette = ReadPalette (stream, meta.DataOffset - 0x40);
}
stream.Position = meta.DataOffset;
byte[] pixels = new byte[meta.UnpackedSize];
if (0 != meta.PackedSize)
{
using (var lzss = new LzssStream (stream.AsStream, LzssMode.Decompress, true))
lzss.Read (pixels, 0, pixels.Length);
}
else
stream.Read (pixels, 0, pixels.Length);
PixelFormat format;
switch (meta.BPP)
{
case 32:
if (HasAlphaChannel (pixels))
format = PixelFormats.Bgra32;
else
format = PixelFormats.Bgr32;
break;
case 24:
format = PixelFormats.Bgr24;
break;
case 16:
format = PixelFormats.Bgr565;
break;
case 8:
if (null != palette)
format = PixelFormats.Indexed8;
else
format = PixelFormats.Gray8;
break;
default:
throw new NotSupportedException ("Not supported GFB color depth");
}
int stride = pixels.Length / (int)info.Height;
return ImageData.CreateFlipped (info, format, palette, pixels, stride);
}
BitmapPalette ReadPalette (IBinaryStream input, int palette_size)
{
palette_size = Math.Min (0x400, palette_size);
var palette_data = input.ReadBytes (palette_size);
if (palette_data.Length != palette_size)
throw new EndOfStreamException();
int color_size = palette_size / 0x100;
var palette = new Color[0x100];
for (int i = 0; i < palette.Length; ++i)
{
int c = i * color_size;
palette[i] = Color.FromRgb (palette_data[c+2], palette_data[c+1], palette_data[c]);
}
return new BitmapPalette (palette);
}
static bool HasAlphaChannel (byte[] pixels)
{
for (int p = 3; p < pixels.Length; p += 4)
{
if (pixels[p] > 0)
return true;
}
return false;
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("GfbFormat.Write not implemented");
}
}
}