GARbro-mirror/Legacy/SplushWave/ImageSWG.cs
2023-08-24 01:33:50 +04:00

189 lines
7.0 KiB
C#

//! \file ImageSWG.cs
//! \date 2023 Aug 14
//! \brief Splush Wave graphics format.
//
// Copyright (C) 2023 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.SplushWave
{
internal class SwgMetaData : ImageMetaData
{
public uint PaletteOffset;
public uint DataOffset;
public byte Depth;
public bool IsCompressed;
}
[Export(typeof(ImageFormat))]
public class SwgFormat : ImageFormat
{
public override string Tag { get { return "SWG"; } }
public override string Description { get { return "Splush Wave Graphics format"; } }
public override uint Signature { get { return 0x475753; } } // 'SWG'
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x30);
uint pal_offset = header.ToUInt32 (0x14);
if (pal_offset != 0)
pal_offset += 0x10;
byte depth = header[0x28];
return new SwgMetaData {
Width = header.ToUInt16 (0x20),
Height = header.ToUInt16 (0x22),
BPP = pal_offset != 0 ? 8 : depth == 2 ? 32 : 24,
DataOffset = header.ToUInt32 (0x10) + 0x10,
PaletteOffset = pal_offset,
Depth = depth,
IsCompressed = header[0x2F] != 0,
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var meta = (SwgMetaData)info;
PixelFormat format = meta.BPP == 8 ? PixelFormats.Indexed8
: meta.BPP == 32 ? PixelFormats.Bgr32 : PixelFormats.Bgr24;
BitmapPalette palette = null;
if (meta.BPP == 8)
{
file.Position = meta.PaletteOffset;
palette = ReadPalette (file.AsStream);
}
int stride = meta.iWidth * meta.BPP / 8;
file.Position = meta.DataOffset;
// var pixels = new byte[stride * meta.iHeight];
var pixels = new byte[4 * meta.iWidth * meta.iHeight];
if (!meta.IsCompressed)
{
file.Read (pixels, 0, pixels.Length);
return ImageData.CreateFlipped (meta, format, palette, pixels, stride);
}
var input = file.ReadBytes ((int)(file.Length - file.Position));
if (!Decompress (input, pixels, meta.Depth + 2, meta.iWidth, meta.iHeight))
throw new InvalidFormatException ("Invalid SWG file.");
return ImageData.CreateFlipped (meta, format, palette, pixels, stride);
}
bool Decompress (byte[] input, byte[] output, int channels, int width, int height)
{
int src = 0;
if (input[0] != 0 || input[1] != 1)
{
int n = 0;
for (int i = 0; i < channels; ++i)
{
if (0 == input[i])
++n;
}
if (n != channels)
return false;
src = 4;
}
int compress_method = input[src+1] + (input[src] << 8);
src += 2;
if (0 == compress_method)
{
for (int i = 0; i < channels; ++i)
{
int pos = i;
int count = height * width;
while (count --> 0)
{
output[pos] = input[src++];
pos += channels;
}
}
return true;
}
if (compress_method != 1)
return false;
int dst = 0;
int v33 = src;
int v37 = height * channels;
src += 2 * v37;
for (int row = 0; row < v37; ++row)
{
int y = row % height;
dst = channels * (width * (height - y - 1) + 1) - row / height - 1;
if (dst > output.Length)
return true;
int v24 = 0;
int v36 = input[v33+1] + (input[v33] << 8);
v33 += 2;
do
{
byte lo = input[src];
byte hi = input[src+1];
if (lo != 0)
{
if (lo < 0x81)
{
++src;
int count = lo + 1;
v24 += count + 1;
while (count --> 0)
{
output[dst] = input[src++];
dst += channels;
}
}
else
{
src += 2;
v24 += 2;
int count = Math.Min (0x101 - lo, output.Length - dst);
while (count --> 0)
{
output[dst] = hi;
dst += channels;
}
}
}
else
{
src += 2;
v24 += 2;
output[dst] = hi;
dst += channels;
}
if (dst >= output.Length)
return true;
}
while (v24 < v36);
}
return true;
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("SwgFormat.Write not implemented");
}
}
}