GARbro-mirror/GameRes/ImageBMP.cs
2014-07-21 23:26:28 +04:00

82 lines
2.7 KiB
C#

//! \file ImageBMP.cs
//! \date Wed Jul 16 18:06:47 2014
//! \brief BMP image implementation.
//
using System.IO;
using System.Linq;
using System.Text;
using System.ComponentModel.Composition;
using System.Windows.Media.Imaging;
using GameRes.Utility;
using System.Windows.Media;
namespace GameRes
{
[Export(typeof(ImageFormat))]
public class BmpFormat : ImageFormat
{
public override string Tag { get { return "BMP"; } }
public override string Description { get { return "Windows device independent bitmap"; } }
public override uint Signature { get { return 0; } }
public override ImageData Read (Stream file, ImageMetaData info)
{
var decoder = new BmpBitmapDecoder (file,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
BitmapSource frame = decoder.Frames.First();
frame.Freeze();
return new ImageData (frame, info);
}
public override void Write (Stream file, ImageData image)
{
var encoder = new BmpBitmapEncoder();
encoder.Frames.Add (BitmapFrame.Create (image.Bitmap));
encoder.Save (file);
}
void SkipBytes (BinaryReader file, uint num)
{
if (file.BaseStream.CanSeek)
file.BaseStream.Seek (num, SeekOrigin.Current);
else
{
for (int i = 0; i < num / 4; ++i)
file.ReadInt32();
for (int i = 0; i < num % 4; ++i)
file.ReadByte();
}
}
public override ImageMetaData ReadMetaData (Stream stream)
{
int c1 = stream.ReadByte();
int c2 = stream.ReadByte();
if (0x42 != c1 || 0x4d != c2)
return null;
using (var file = new ArcView.Reader (stream))
{
uint size = file.ReadUInt32();
if (size < 14+40)
return null;
SkipBytes (file, 8);
uint header_size = file.ReadUInt32();
if (header_size < 40 || size-14 < header_size)
return null;
uint width = file.ReadUInt32();
uint height = file.ReadUInt32();
file.ReadInt16();
int bpp = file.ReadInt16();
return new ImageMetaData {
Width = width,
Height = height,
OffsetX = 0,
OffsetY = 0,
BPP = bpp
};
}
}
}
}