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(PngIsmFormat): PNG image with inverted alpha-channel.
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71
ArcFormats/Ism/ImagePNG.cs
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71
ArcFormats/Ism/ImagePNG.cs
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//! \file ImagePNG.cs
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//! \date 2023 Sep 02
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//! \brief PNG image with inverted alpha-channel.
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//
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// Copyright (C) 2023 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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namespace GameRes.Formats.Ism
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{
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[Export(typeof(ImageFormat))]
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[ExportMetadata("Priority", -1)] // deprioritize
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public class PngIsmFormat : ImageFormat
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{
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public override string Tag { get => "PNG/ISM"; }
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public override string Description { get => "ISM engine PNG image"; }
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public override uint Signature { get => 0x474e5089; }
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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// format only applied when extracting from related archive
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if (!VFS.IsVirtual || VFS.CurrentArchive.Tag != "ISA")
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return null;
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return Png.ReadMetaData (file);
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}
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public override ImageData Read (IBinaryStream file, ImageMetaData info)
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{
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var decoder = new PngBitmapDecoder (file.AsStream,
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BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
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BitmapSource bitmap = decoder.Frames[0];
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if (bitmap.Format != PixelFormats.Bgra32)
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return new ImageData (bitmap, info);
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int stride = bitmap.PixelWidth * 4;
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var pixels = new byte[stride * bitmap.PixelHeight];
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bitmap.CopyPixels (pixels, stride, 0);
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for (int i = 3; i < pixels.Length; i += 4)
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{
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pixels[i] ^= 0xFF;
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}
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return ImageData.Create (info, bitmap.Format, bitmap.Palette, pixels);
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}
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public override void Write (Stream file, ImageData image)
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{
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throw new System.NotImplementedException ("PngIsmFormat.Write not implemented");
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}
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}
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}
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