public void WriteToStreamTest()
{
ReportStart();
Size screenSize = new Size( 12, 4 );
bool hasGlobalColourTable = false;
int colourResolution = 3;
bool globalColourTableIsSorted = true;
int globalColourTableSizeBits = 4;
int backgroundColourIndex = 2;
int pixelAspectRatio = 1;
_lsd = new LogicalScreenDescriptor( screenSize,
hasGlobalColourTable,
colourResolution,
globalColourTableIsSorted,
globalColourTableSizeBits,
backgroundColourIndex,
pixelAspectRatio );
MemoryStream s = new MemoryStream();
_lsd.WriteToStream( s );
s.Seek( 0, SeekOrigin.Begin );
_lsd = new LogicalScreenDescriptor( s );
Assert.AreEqual( ErrorState.Ok, _lsd.ConsolidatedState );
Assert.AreEqual( screenSize, _lsd.LogicalScreenSize );
Assert.AreEqual( hasGlobalColourTable, _lsd.HasGlobalColourTable );
Assert.AreEqual( colourResolution, _lsd.ColourResolution );
Assert.AreEqual( globalColourTableIsSorted, _lsd.GlobalColourTableIsSorted );
Assert.AreEqual( globalColourTableSizeBits, _lsd.GlobalColourTableSizeBits );
Assert.AreEqual( backgroundColourIndex, _lsd.BackgroundColourIndex );
Assert.AreEqual( pixelAspectRatio, _lsd.PixelAspectRatio );
ReportEnd();
}
private void ConstructorStreamEndOfStreamTest( bool xmlDebugging )
{
Size screenSize = new Size( 12, 4 );
bool hasGlobalColourTable = false;
int colourResolution = 3;
bool globalColourTableIsSorted = true;
int globalColourTableSizeBits = 4;
int backgroundColourIndex = 2;
int pixelAspectRatio = 1;
_lsd = new LogicalScreenDescriptor( screenSize,
hasGlobalColourTable,
colourResolution,
globalColourTableIsSorted,
globalColourTableSizeBits,
backgroundColourIndex,
pixelAspectRatio );
MemoryStream s = new MemoryStream();
_lsd.WriteToStream( s );
s.SetLength( s.Length - 1 ); // remove final byte from stream
s.Seek( 0, SeekOrigin.Begin );
_lsd = new LogicalScreenDescriptor( s, xmlDebugging );
Assert.AreEqual( ErrorState.EndOfInputStream, _lsd.ConsolidatedState );
Assert.AreEqual( screenSize, _lsd.LogicalScreenSize );
Assert.AreEqual( hasGlobalColourTable, _lsd.HasGlobalColourTable );
Assert.AreEqual( colourResolution, _lsd.ColourResolution );
Assert.AreEqual( globalColourTableIsSorted, _lsd.GlobalColourTableIsSorted );
Assert.AreEqual( globalColourTableSizeBits, _lsd.GlobalColourTableSizeBits );
Assert.AreEqual( backgroundColourIndex, _lsd.BackgroundColourIndex );
Assert.AreEqual( -1, _lsd.PixelAspectRatio );
if( xmlDebugging )
{
Assert.AreEqual( ExpectedDebugXml, _lsd.DebugXml );
}
}
/// <summary>
/// Writes a Logical Screen Descriptor to the supplied stream.
/// Also writes a global colour table if required.
/// </summary>
/// <param name="outputStream">
/// The stream to write to.
/// </param>
private void WriteLogicalScreenDescriptor( Stream outputStream )
{
bool hasGlobalColourTable = _strategy == ColourTableStrategy.UseGlobal;
int colourResolution = 7; // TODO: parameterise colourResolution?
bool globalColourTableIsSorted = false; // Sorting of colour tables is not currently supported
int backgroundColorIndex = 0; // TODO: parameterise backgroundColourIndex?
int pixelAspectRatio = 0; // TODO: parameterise pixelAspectRatio?
if( _strategy == ColourTableStrategy.UseGlobal )
{
if( _quantizerType == QuantizerType.UseSuppliedPalette )
{
// use supplied palette
_globalColourTable = new ColourTable();
string buildColourTableCounterText
= "Building colour table from supplied palette";
AddCounter( buildColourTableCounterText,
_palette.Count );
int paletteIndex = 0;
foreach( Color c in _palette )
{
_globalColourTable.Add( c );
MyProgressCounters[buildColourTableCounterText].Value
= paletteIndex;
paletteIndex++;
}
_globalColourTable.Pad();
RemoveCounter( buildColourTableCounterText );
}
else
{
// Analyse the pixels in all the images to build the
// global colour table.
Collection<Image> images = new Collection<Image>();
foreach( GifFrame thisFrame in _frames )
{
Image thisImage = thisFrame.TheImage;
images.Add( thisImage );
}
_pixelAnalysis = new PixelAnalysis( images );
_pixelAnalysis.ColourQuality = _quality;
_pixelAnalysis.Analyse();
_globalColourTable = _pixelAnalysis.ColourTable;
}
LogicalScreenDescriptor lsd =
new LogicalScreenDescriptor( _logicalScreenSize,
hasGlobalColourTable,
colourResolution,
globalColourTableIsSorted,
_globalColourTable.SizeBits,
backgroundColorIndex,
pixelAspectRatio );
lsd.WriteToStream( outputStream );
_globalColourTable.WriteToStream( outputStream );
}
else
{
LogicalScreenDescriptor lsd =
new LogicalScreenDescriptor( _logicalScreenSize,
hasGlobalColourTable,
colourResolution,
globalColourTableIsSorted,
7,
backgroundColorIndex,
pixelAspectRatio );
lsd.WriteToStream( outputStream );
}
}
