public void WriteToStreamTest()
{
ReportStart();
int blockSize = 4;
DisposalMethod disposalMethod = DisposalMethod.DoNotDispose;
bool expectsUserInput = false;
bool hasTransparentColour = true;
int delayTime = 10;
int transparentColourIndex = 6;
_gce = new GraphicControlExtension( blockSize,
disposalMethod,
expectsUserInput,
hasTransparentColour,
delayTime,
transparentColourIndex );
MemoryStream s = new MemoryStream();
_gce.WriteToStream( s );
s.Seek( 0, SeekOrigin.Begin );
_gce = new GraphicControlExtension( s );
Assert.AreEqual( ErrorState.Ok, _gce.ConsolidatedState );
Assert.AreEqual( blockSize, _gce.BlockSize );
Assert.AreEqual( disposalMethod, _gce.DisposalMethod );
Assert.AreEqual( expectsUserInput, _gce.ExpectsUserInput );
Assert.AreEqual( hasTransparentColour, _gce.HasTransparentColour );
Assert.AreEqual( delayTime, _gce.DelayTime );
Assert.AreEqual( transparentColourIndex, _gce.TransparentColourIndex );
ReportEnd();
}
/// <summary>
/// Writes a Graphic Control Extension to the supplied output stream.
/// </summary>
/// <param name="frame">
/// The GifFrame to which this graphic control extension relates.
/// </param>
/// <param name="transparentColourIndex">
/// The index within the active colour table of the transparent colour.
/// </param>
/// <param name="outputStream">
/// The stream to write to.
/// </param>
private void WriteGraphicCtrlExt( GifFrame frame,
int transparentColourIndex,
Stream outputStream )
{
outputStream.WriteByte( GifComponent.CodeExtensionIntroducer );
outputStream.WriteByte( GifComponent.CodeGraphicControlLabel );
// The frame doesn't have have a graphic control extension yet, so we
// need to work out what it would contain.
DisposalMethod disposalMethod;
bool hasTransparentColour;
if( _transparent == Color.Empty ) // TODO: remove reference to _transparent - parameterise?
{
hasTransparentColour = false;
disposalMethod = DisposalMethod.NotSpecified; // dispose = no action
}
else
{
// TESTME: WriteGraphicCtrlExt - _transparent != Color.Empty
hasTransparentColour = true;
disposalMethod = DisposalMethod.RestoreToBackgroundColour; // force clear if using transparent color
}
int blockSize = 4;
GraphicControlExtension gce
= new GraphicControlExtension( blockSize,
disposalMethod,
frame.ExpectsUserInput,
hasTransparentColour,
frame.Delay,
transparentColourIndex );
gce.WriteToStream( outputStream );
}
