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implemented AJP images.

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morkt 2016-09-13 03:01:29 +04:00
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commit f68df1b5ab
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ArcFormats/AliceSoft/ImageAJP.cs Normal file
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//! \file ImageAJP.cs
//! \date Mon Sep 12 21:25:27 2016
//! \brief AliceSoft JPEG image.
//
// Copyright (C) 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Utility;
namespace GameRes.Formats.AliceSoft
{
internal class AjpMetaData : ImageMetaData
{
public uint ImageOffset;
public uint ImageSize;
public uint AlphaOffset;
public uint AlphaSize;
}
[Export(typeof(ImageFormat))]
public class AjpFormat : ImageFormat
{
public override string Tag { get { return "AJP"; } }
public override string Description { get { return "AliceSoft JPEG image format"; } }
public override uint Signature { get { return 0x504A41; } } // 'AJP'
internal static byte[] Key = {
0x5D, 0x91, 0xAE, 0x87, 0x4A, 0x56, 0x41, 0xCD, 0x83, 0xEC, 0x4C, 0x92, 0xB5, 0xCB, 0x16, 0x34
};
public override ImageMetaData ReadMetaData (Stream stream)
{
var header = new byte[0x18];
stream.Position = 0xC;
if (header.Length != stream.Read (header, 0, header.Length))
return null;
return new AjpMetaData
{
Width = LittleEndian.ToUInt32 (header, 0),
Height = LittleEndian.ToUInt32 (header, 4),
BPP = 32,
ImageOffset = LittleEndian.ToUInt32 (header, 8),
ImageSize = LittleEndian.ToUInt32 (header, 0xC),
AlphaOffset = LittleEndian.ToUInt32 (header, 0x10),
AlphaSize = LittleEndian.ToUInt32 (header, 0x14),
};
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = (AjpMetaData)info;
int stride = (int)meta.Width * 4;
byte[] pixels;
using (var jpeg = DecryptStream (stream, meta.ImageOffset, meta.ImageSize))
{
var decoder = new JpegBitmapDecoder (jpeg,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
BitmapSource bitmap = decoder.Frames[0];
if (bitmap.Format.BitsPerPixel != 32)
bitmap = new FormatConvertedBitmap (bitmap, PixelFormats.Bgr32, null, 0);
pixels = new byte[stride * (int)meta.Height];
bitmap.CopyPixels (pixels, stride, 0);
}
using (var mask = DecryptStream (stream, meta.AlphaOffset, meta.AlphaSize))
{
var alpha = ReadMask (mask);
int src = 0;
for (int dst = 3; dst < pixels.Length; dst += 4)
{
pixels[dst] = alpha[src++];
}
return ImageData.Create (info, PixelFormats.Bgra32, null, pixels, stride);
}
}
Stream DecryptStream (Stream input, uint offset, uint size)
{
var header = new byte[Key.Length];
input.Position = offset;
input.Read (header, 0, header.Length);
for (int i = 0; i < header.Length; ++i)
header[i] ^= Key[i];
if (size > header.Length)
{
var rest = new StreamRegion (input, input.Position, size - header.Length, true);
return new PrefixStream (header, rest);
}
else
return new MemoryStream (header, 0, (int)size);
}
byte[] ReadMask (Stream input)
{
var header = new byte[0x40];
input.Read (header, 0, header.Length);
int width = LittleEndian.ToInt32 (header, 0x18);
int height = LittleEndian.ToInt32 (header, 0x1C);
int data_offset = LittleEndian.ToInt32 (header, 0x20);
int pal_offset = LittleEndian.ToInt32 (header, 0x24);
var pixels = new byte[width * height];
int dst = 0;
input.Position = data_offset;
while (dst < pixels.Length)
{
int c = input.ReadByte();
if (-1 == c)
break;
if (c < 0xF8)
{
pixels[dst++] = (byte)c;
continue;
}
int count = 0;
switch (c)
{
case 0xF8:
pixels[dst++] = (byte)input.ReadByte();
break;
case 0xFC:
count = input.ReadByte();
input.Read (pixels, dst, 2);
count = count * 2 + 4;
Binary.CopyOverlapped (pixels, dst, dst+2, count);
dst += count+2;
break;
case 0xFD:
count = input.ReadByte() + 4;
byte b = (byte)input.ReadByte();
while (count --> 0)
pixels[dst++] = b;
break;
case 0xFE:
count = input.ReadByte() + 3;
Binary.CopyOverlapped (pixels, dst - width*2, dst, count);
dst += count;
break;
case 0xFF:
count = input.ReadByte() + 3;
Binary.CopyOverlapped (pixels, dst - width, dst, count);
dst += count;
break;
default:
throw new InvalidFormatException();
}
}
input.Position = pal_offset;
var index = ReadGrayPalette (input);
for (int i = 0; i < pixels.Length; ++i)
pixels[i] = index[pixels[i]];
return pixels;
}
byte[] ReadGrayPalette (Stream input)
{
var palette = new byte[0x300];
if (0x300 != input.Read (palette, 0, 0x300))
throw new EndOfStreamException();
var gray = new byte[0x100];
for (int i = 0; i < 0x100; ++i)
{
int c = i * 3;
gray[i] = (byte)((palette[c] + palette[c+1] + palette[c+2]) / 3);
}
return gray;
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("AjpFormat.Write not implemented");
}
}
}