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);
}
}
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();
}
/// <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();
//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);
}
}
