public bool Save(Stream stream)
{
Contract.Assert(stream != null && stream.CanWrite && stream.CanSeek && stream.Position == 0);
ImageFileHeader ifh = new ImageFileHeader();
var nextIfdIndex = 8;
bool isBigEndian = false;
ifh.Save(stream, isBigEndian, nextIfdIndex);
for (var i = 0; i < frameList.Count; i++)
{
var frame = frameList[i];
var isLastOne = i == frameList.Count - 1;
frame.Save(stream, isBigEndian, isLastOne);
}
return(true);
}
/// <summary>
///
/// </summary>
/// <param name="stream"></param>
/// <param name="quickly">为true时，快速加载，只解析每个帧的头信息，而不解析所有内容(第一帧为完整加载)</param>
/// <returns></returns>
public bool Load(Stream stream, bool quickly = false)
{
var ifh = new ImageFileHeader();
if (!ifh.Load(stream))
{
return(false);
}
IsBigEndian = ifh.IsBigEndian;
//第一个IFD位置偏移
var nextPosition = ifh.FirstFramePosition;
while (true)
{
if (nextPosition != stream.Position)
{
Contract.Requires(nextPosition > stream.Position);
stream.Position = nextPosition;
}
var ifd = new ImageFileDirection();
if (quickly)
{
ifd.LoadHeader(stream, IsBigEndian);
}
else
{
ifd.Load(stream, IsBigEndian);
}
ImageFileDirectionList.Add(ifd);
if (ifd.NextIfdIndex == 0)
{
break;
}
nextPosition = ifd.NextIfdIndex;
}
Contract.Requires(ImageFileDirectionList.Count > 0);
return(true);
}
