//! \file ImageBMP.cs //! \date Wed Mar 16 01:08:47 2016 //! \brief Emon Engine compressed images. // // 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; using System.ComponentModel.Composition; using System.IO; using System.Windows.Media; using System.Windows.Media.Imaging; using GameRes.Compression; namespace GameRes.Formats.EmonEngine { internal class EmMetaData : ImageMetaData { public int Colors; public int Stride; public int LzssFrameSize; public int LzssInitPos; public int DataOffset; } [Export(typeof(ImageFormat))] public class EmFormat : ImageFormat { public override string Tag { get { return "EM/BMP"; } } public override string Description { get { return "Emon Engine image format"; } } // this is an artificial prefix embedded into stream by EmeOpener.OpenImage public override uint Signature { get { return 0x4D424D45; } } // 'EMBM' public EmFormat () { Extensions = new string[] { "bmp" }; } public override ImageMetaData ReadMetaData (Stream stream) { using (var reader = new ArcView.Reader (stream)) { reader.ReadInt32(); var info = new EmMetaData(); info.LzssFrameSize = reader.ReadUInt16(); info.LzssInitPos = reader.ReadUInt16(); info.BPP = reader.ReadUInt16() & 0xFF; info.Width = reader.ReadUInt16(); info.Height = reader.ReadUInt16(); info.Colors = reader.ReadUInt16(); info.Stride = reader.ReadInt32(); info.OffsetX = reader.ReadInt32(); info.OffsetY = reader.ReadInt32(); info.DataOffset = 40; return info; } } public override ImageData Read (Stream stream, ImageMetaData info) { var meta = (EmMetaData)info; stream.Position = meta.DataOffset; BitmapPalette palette = null; if (meta.Colors != 0) palette = ReadPalette (stream, Math.Max (meta.Colors, 3)); var pixels = new byte[meta.Stride * (int)info.Height]; if (meta.LzssFrameSize != 0) { using (var lzss = new LzssStream (stream, LzssMode.Decompress, true)) { lzss.Config.FrameSize = meta.LzssFrameSize; lzss.Config.FrameInitPos = meta.LzssInitPos; if (pixels.Length != lzss.Read (pixels, 0, pixels.Length)) throw new EndOfStreamException(); } } else { if (pixels.Length != stream.Read (pixels, 0, pixels.Length)) throw new EndOfStreamException(); } if (7 == meta.BPP) return ImageData.Create (info, PixelFormats.Gray8, palette, pixels, meta.Stride); PixelFormat format; if (32 == meta.BPP) format = PixelFormats.Bgr32; else if (24 == meta.BPP) format = PixelFormats.Bgr24; else format = PixelFormats.Indexed8; return ImageData.CreateFlipped (info, format, palette, pixels, meta.Stride); } BitmapPalette ReadPalette (Stream input, int colors) { int palette_size = colors * 4; var palette_data = new byte[palette_size]; if (palette_size != input.Read (palette_data, 0, palette_size)) throw new InvalidFormatException(); var palette = new Color[colors]; int src = 0; for (int i = 0; i < palette.Length; ++i) { palette[i] = Color.FromRgb (palette_data[src], palette_data[src+1], palette_data[src+2]); src += 4; } return new BitmapPalette (palette); } public override void Write (Stream file, ImageData image) { throw new System.NotImplementedException ("EmFormat.Write not implemented"); } } }