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237 lines
8.9 KiB
C#
237 lines
8.9 KiB
C#
//! \file ImageBMP.cs
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//! \date Wed Jul 16 18:06:47 2014
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//! \brief BMP image implementation.
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//
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// Copyright (C) 2014-2016 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.IO;
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using System.Linq;
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using System.Text;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using GameRes.Strings;
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using GameRes.Utility;
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namespace GameRes
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{
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public class BmpMetaData : ImageMetaData
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{
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public uint ImageLength;
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public uint ImageOffset;
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}
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public interface IBmpExtension
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{
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ImageData Read (IBinaryStream file, BmpMetaData info);
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}
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[Export(typeof(ImageFormat))]
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[ExportMetadata("Priority", 10)]
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public sealed class BmpFormat : ImageFormat
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{
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public override string Tag { get { return "BMP"; } }
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public override string Description { get { return "Windows device independent bitmap"; } }
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public override uint Signature { get { return 0; } }
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public override bool CanWrite { get { return true; } }
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public BmpFormat ()
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{
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Settings = new[] { EnableExtensions };
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}
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#pragma warning disable 649
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[ImportMany(typeof(IBmpExtension))]
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private IEnumerable<IBmpExtension> m_extensions;
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#pragma warning restore 649
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LocalResourceSetting EnableExtensions = new LocalResourceSetting {
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Name = "BMPEnableExtensions",
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Text = garStrings.BMPExtensionsText,
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Description = garStrings.BMPExtensionsDesc,
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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 bmp_info = info as BmpMetaData;
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if (bmp_info != null && EnableExtensions.Get<bool>() && file.AsStream.CanSeek)
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{
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foreach (var ext in m_extensions)
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{
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try
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{
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var image = ext.Read (file, bmp_info);
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if (null != image)
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return image;
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}
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catch (System.Exception X)
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{
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System.Diagnostics.Trace.WriteLine (X.Message, ext.ToString());
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}
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file.Position = 0;
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}
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}
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var decoder = new BmpBitmapDecoder (file.AsStream,
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BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
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BitmapSource frame = decoder.Frames.First();
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frame.Freeze();
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return new ImageData (frame, info);
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}
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public override void Write (Stream file, ImageData image)
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{
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var encoder = new BmpBitmapEncoder();
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encoder.Frames.Add (BitmapFrame.Create (image.Bitmap, null, null, null));
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encoder.Save (file);
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}
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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int c1 = file.ReadByte();
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int c2 = file.ReadByte();
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if ('B' != c1 || 'M' != c2)
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return null;
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uint size = file.ReadUInt32();
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file.ReadUInt32();
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uint image_offset = file.ReadUInt32();
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uint header_size = file.ReadUInt32();
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if (size < 14+header_size)
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{
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// some otherwise valid bitmaps have size field set to zero
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if (size != 0 && size != 0xE || !file.AsStream.CanSeek)
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return null;
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size = (uint)file.Length;
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}
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else if (file.AsStream.CanSeek)
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{
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if (size > file.Length)
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size = (uint)file.Length;
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}
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uint width, height;
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if (0xC == header_size)
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{
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width = file.ReadUInt16();
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height = file.ReadUInt16();
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}
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else if (header_size < 40 || size-14 < header_size)
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{
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return null;
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}
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else
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{
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width = file.ReadUInt32();
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height = file.ReadUInt32();
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}
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file.ReadInt16();
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int bpp = file.ReadInt16();
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return new BmpMetaData {
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Width = width,
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Height = height,
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OffsetX = 0,
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OffsetY = 0,
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BPP = bpp,
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ImageLength = size,
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ImageOffset = image_offset,
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};
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}
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}
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[Export(typeof(IBmpExtension))]
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public class BitmapWithAlpha : IBmpExtension
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{
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public ImageData Read (IBinaryStream file, BmpMetaData info)
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{
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if (file.AsStream.CanSeek)
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{
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var width_x_height = info.Width * info.Height;
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uint bmp_length = width_x_height * (uint)info.BPP/8 + info.ImageOffset;
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if (bmp_length == info.ImageLength || bmp_length+2 == info.ImageLength)
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{
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if (0x20 == info.BPP)
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{
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return ReadBitmapBGRA (file, info);
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}
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else if (0x18 == info.BPP)
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{
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uint length_with_alpha = info.ImageLength + width_x_height;
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if (length_with_alpha == file.Length || length_with_alpha + info.Width == file.Length)
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return ReadBitmapWithAlpha (file, info);
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}
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}
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else if (0x20 == info.BPP && (info.ImageLength - (width_x_height * 3 + info.ImageOffset)) <= 2)
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{
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return ReadBitmapBGRA (file, info);
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}
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}
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return null;
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}
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private ImageData ReadBitmapWithAlpha (IBinaryStream file, BmpMetaData info)
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{
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file.Position = info.ImageLength;
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var alpha = new byte[info.Width*info.Height];
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if (alpha.Length != file.Read (alpha, 0, alpha.Length))
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throw new EndOfStreamException();
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file.Position = info.ImageOffset;
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int dst_stride = (int)info.Width * 4;
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var pixels = new byte[(int)info.Height * dst_stride];
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int a_src = 0;
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for (int y = (int)info.Height-1; y >= 0; --y)
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{
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int dst = dst_stride * y;
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for (int x = 0; x < dst_stride; x += 4)
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{
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file.Read (pixels, dst+x, 3);
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pixels[dst+x+3] = alpha[a_src++];
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}
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}
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return ImageData.Create (info, PixelFormats.Bgra32, null, pixels, dst_stride);
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}
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private ImageData ReadBitmapBGRA (IBinaryStream file, BmpMetaData info)
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{
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file.Position = info.ImageOffset;
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int stride = (int)info.Width * 4;
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var pixels = new byte[(int)info.Height * stride];
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bool has_alpha = false;
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for (int y = (int)info.Height-1; y >= 0; --y)
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{
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int dst = stride * y;
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file.Read (pixels, dst, stride);
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for (int x = 3; !has_alpha && x < stride; x += 4)
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has_alpha = pixels[dst+x] != 0;
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/* // sometimes alpha channel is inverted
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for (int x = 3; x < stride; x += 4)
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{
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pixels[dst+x] ^= 0xFF;
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has_alpha = has_alpha || pixels[dst+x] != 0;
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}
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*/
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}
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PixelFormat format = has_alpha ? PixelFormats.Bgra32 : PixelFormats.Bgr32;
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return ImageData.Create (info, format, null, pixels, stride);
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}
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}
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}
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