GARbro-mirror/ArcFormats/Ism/ImagePNG.cs

72 lines
2.9 KiB
C#

//! \file ImagePNG.cs
//! \date 2023 Sep 02
//! \brief PNG image with inverted alpha-channel.
//
// 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace GameRes.Formats.Ism
{
[Export(typeof(ImageFormat))]
[ExportMetadata("Priority", -1)] // deprioritize
public class PngIsmFormat : ImageFormat
{
public override string Tag { get => "PNG/ISM"; }
public override string Description { get => "ISM engine PNG image"; }
public override uint Signature { get => 0x474e5089; }
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
// format only applied when extracting from related archive
if (!VFS.IsVirtual || VFS.CurrentArchive.Tag != "ISA")
return null;
return Png.ReadMetaData (file);
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var decoder = new PngBitmapDecoder (file.AsStream,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
BitmapSource bitmap = decoder.Frames[0];
if (bitmap.Format != PixelFormats.Bgra32)
return new ImageData (bitmap, info);
int stride = bitmap.PixelWidth * 4;
var pixels = new byte[stride * bitmap.PixelHeight];
bitmap.CopyPixels (pixels, stride, 0);
for (int i = 3; i < pixels.Length; i += 4)
{
pixels[i] ^= 0xFF;
}
return ImageData.Create (info, bitmap.Format, bitmap.Palette, pixels);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("PngIsmFormat.Write not implemented");
}
}
}