public void Save(Stream aStream)
{
this.BehaviorExtention.Save(aStream);
foreach (var _extention in this.Extensions)
{
_extention.Save(aStream);
}
aStream.WriteByte(Separator);
var _bw = new BinaryWriter(aStream);
_bw.Write(this.FOffsetX);
_bw.Write(this.FOffsetY);
_bw.Write((UInt16)this.Width);
_bw.Write((UInt16)this.Height);
_bw.Write(this.ImageFlags);
if (!this.UseGlobalPalette)
{
foreach (var _c in this.FFrame.Palette.Colors)
{
_bw.Write(_c.R);
_bw.Write(_c.G);
_bw.Write(_c.B);
}
}
var _gifEncoder = new GifBitmapEncoder();
_gifEncoder.Frames.Add(this.FFrame);
var _buff = new MemoryStream();
_gifEncoder.Save(_buff);
// find image data start position
var _fileHeaderSize = 13;
_buff.Seek(_fileHeaderSize, SeekOrigin.Begin);
GifExtension _ext = null;
while ((_ext = GifExtension.Load(_buff)) != null)
{
;
}
var _imageDataStart = (int)_buff.Position;
var _data = _buff.ToArray();
_buff.Close();
var _imageHeaderSize = 9;
int _imageDataStartPosition = _imageDataStart + _imageHeaderSize + this.FFrame.Palette.Colors.Count * 3;
_bw.Write(_data, _imageDataStartPosition, _data.Length - _imageDataStartPosition - 1);
}
public void Load(Stream aStream)
{
var _decoder = new GifBitmapDecoder(aStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
aStream.Position = 0;
var _formatIdData = new byte[FormatId.Length];
aStream.Read(_formatIdData, 0, _formatIdData.Length);
var _br = new BinaryReader(aStream);
this.FScreenWidth = _br.ReadUInt16();
this.FScreenHeight = _br.ReadUInt16();
int _flags = _br.ReadByte();
this.FBackgroundColorIndex = _br.ReadByte();
aStream.ReadByte(); // skip pixel shape
if ((_flags & 0x80) != 0)
{
int _bitsPerPixel = (_flags & 0x07) + 1;
int _paletteLength = (int)Math.Pow(2, _bitsPerPixel);
var _colors = new List <Color>(_paletteLength);
for (int i = 0; i < _paletteLength; i++)
{
var _c = new Color();
_c.R = _br.ReadByte();
_c.G = _br.ReadByte();
_c.B = _br.ReadByte();
_colors.Add(_c);
}
this.FGlobalPalette = new BitmapPalette(_colors);
}
GifExtension _extension = null;
while ((_extension = GifExtension.Load(aStream)) != null &&
_extension.ExtensionType != ExtensionType.ImageBehaviorExtension)
{
this.Extensions.Add(_extension);
}
for (int i = 0; i < _decoder.Frames.Count; i++)
{
var _currentFrame = new GifBitmapFrame(_decoder.Frames[i]);
_currentFrame.BehaviorExtention = _extension;
_extension = _currentFrame.Load(aStream);
this.Frames.Add(_currentFrame);
}
}
public GifExtension Load(Stream aStream)
{
GifExtension _extension = null;
while ((_extension = GifExtension.Load(aStream)) != null)
{
this.Extensions.Add(_extension);
}
var _br = new BinaryReader(aStream);
this.FOffsetX = _br.ReadUInt16();
this.FOffsetY = _br.ReadUInt16();
_br.ReadUInt16(); // don't store width, get from frame
_br.ReadUInt16(); // don't store heiht, get from frame
this.ImageFlags = _br.ReadByte();
// palette stored in frame
if (!this.UseGlobalPalette)
{
aStream.Seek(this.FFrame.Palette.Colors.Count * 3, SeekOrigin.Current);
}
_br.ReadByte(); // skip code size
// image data stored in frame
var _dataLength = _br.ReadByte();
while (_dataLength != 0)
{
aStream.Seek(_dataLength, SeekOrigin.Current);
_dataLength = _br.ReadByte();
}
while ((_extension = GifExtension.Load(aStream)) != null &&
_extension.ExtensionType != ExtensionType.ImageBehaviorExtension)
{
this.Extensions.Add(_extension);
}
return(_extension);
}
public static GifExtension Load(Stream aStream)
{
var _br = new BinaryReader(aStream);
if (_br.ReadByte() != Separator)
{
return(null);
}
var _extensionType = (ExtensionType)_br.ReadByte();
GifExtension _extension = null;
switch (_extensionType)
{
case ExtensionType.ApplicationExtension:
{
_extension = new GifApplicationExtension();
break;
}
case ExtensionType.CommentExtension:
{
_extension = new GifCommentExtension();
break;
}
case ExtensionType.ImageBehaviorExtension:
{
_extension = new GifExtension(_extensionType);
break;
}
}
_extension.FExtensionType = _extensionType;
_extension.LoadData(aStream);
return(_extension);
}
