GARbro-mirror/Legacy/Artel/ImageMRL.cs
2020-03-30 17:25:15 +04:00

166 lines
5.7 KiB
C#

//! \file ImageMRL.cs
//! \date 2019 May 22
//! \brief ADVG Script Interpreter System 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace GameRes.Formats.Artel
{
internal class MrlMetaData : ImageMetaData
{
public bool HasAlpha;
}
[Export(typeof(ImageFormat))]
public class MrlFormat : ImageFormat
{
public override string Tag { get { return "MRL"; } }
public override string Description { get { return "Artel ADVG engine image format"; } }
public override uint Signature { get { return 0x524D754D; } } // 'MuMRL'
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x18);
if (header[4] != 'L')
return null;
int bpp = header.ToUInt16 (0xC) * 8;
bool has_alpha = (header[8] & 8) != 0;
if (24 == bpp && has_alpha)
bpp = 32;
return new MrlMetaData {
Width = header.ToUInt32 (0x10),
Height = header.ToUInt32 (0x14),
BPP = bpp,
HasAlpha = has_alpha,
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var meta = (MrlMetaData)info;
BitmapPalette palette = null;
file.Position = 0x18;
if (8 == info.BPP)
palette = ReadPalette (file.AsStream);
int stride = info.iWidth * (info.BPP / 8);
int channel_size = info.iWidth * info.iHeight;
var pixels = new byte[stride * info.iHeight];
var input_length = (int)(file.Length - file.Position);
var input = file.ReadBytes (input_length);
DecryptInput (input, 8);
MrlDecompress (input, pixels);
RestoreOutput (pixels);
byte[] image;
if (8 == info.BPP)
{
if (!meta.HasAlpha)
return ImageData.CreateFlipped (info, PixelFormats.Indexed8, palette, pixels, stride);
stride = info.iWidth * 4;
image = new byte[stride * info.iHeight];
int src = 0;
int asrc = channel_size;
var colors = palette.Colors;
for (int dst = 0; dst < image.Length; dst += 4)
{
byte c = pixels[src++];
image[dst ] = colors[c].B;
image[dst+1] = colors[c].G;
image[dst+2] = colors[c].R;
image[dst+3] = pixels[asrc++];
}
}
else
{
image = new byte[pixels.Length];
int channels = info.BPP / 8;
int src = 0;
for (int c = 0; c < channels; ++c)
{
int dst = c;
for (int i = 0; i < channel_size; ++i)
{
image[dst] = pixels[src++];
dst += channels;
}
}
}
PixelFormat format = meta.HasAlpha ? PixelFormats.Bgra32 : PixelFormats.Bgr24;
return ImageData.CreateFlipped (info, format, palette, image, stride);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("MrlFormat.Write not implemented");
}
internal static void DecryptInput (byte[] data, byte key)
{
for (int i = 0; i < data.Length; ++i)
{
data[i] ^= key++;
}
}
internal static void MrlDecompress (byte[] input, byte[] output)
{
int src = 0;
int dst = 0;
while (src < input.Length && dst < output.Length)
{
byte p = input[src++];
if (p != 0)
{
output[dst++] = p;
}
else
{
int count = 1;
do
{
p = input[src++];
count += p;
}
while (0xFF == p);
dst += count;
}
}
}
internal static void RestoreOutput (byte[] data)
{
byte key = data[0];
for (int i = 1; i < data.Length; ++i)
{
data[i] ^= key;
key = data[i];
}
}
}
}