public void GetColoursTest()
{
ReportStart();
_bitmap = RandomBitmap.Create(new Size(100, 100), 20,
PixelFormat.Format32bppArgb);
Collection <Color> expectedColours = new Collection <Color>();
for (int y = 0; y < _bitmap.Height; y++)
{
for (int x = 0; x < _bitmap.Width; x++)
{
expectedColours.Add(_bitmap.GetPixel(x, y));
}
}
Color[] actualColours = ImageTools.GetColours(_bitmap);
Assert.AreEqual(expectedColours.Count, actualColours.Length);
for (int i = 0; i < expectedColours.Count; i++)
{
ColourAssert.AreEqual(expectedColours[i],
actualColours[i],
"Index " + i);
}
ReportEnd();
}
public void GetRgbCollectionTest()
{
ReportStart();
_bitmap = RandomBitmap.Create(new Size(50, 50), 10,
PixelFormat.Format32bppArgb);
Color[] colours = ImageTools.GetColours(_bitmap);
int len = colours.Length;
byte[] exected = new byte[len * 3];
int rgbIndex;
for (int colourIndex = 0; colourIndex < len; colourIndex++)
{
rgbIndex = colourIndex * 3;
exected[rgbIndex] = (byte)colours[colourIndex].R;
exected[rgbIndex + 1] = (byte)colours[colourIndex].G;
exected[rgbIndex + 2] = (byte)colours[colourIndex].B;
}
Collection <byte> actual = ImageTools.GetRgbCollection(colours);
Assert.AreEqual(exected.Length, actual.Count);
for (int i = 0; i < exected.Length; i++)
{
Assert.AreEqual(actual[i], exected[i], "Index " + i);
}
ReportEnd();
}
public void GetDistinctColoursTest()
{
ReportStart();
_bitmap = RandomBitmap.Create(new Size(50, 50), 10,
PixelFormat.Format32bppArgb);
Collection <Color> expectedDistinctColours = new Collection <Color>();
Color c;
for (int y = 0; y < _bitmap.Height; y++)
{
for (int x = 0; x < _bitmap.Width; x++)
{
c = _bitmap.GetPixel(x, y);
if (expectedDistinctColours.Contains(c) == false)
{
expectedDistinctColours.Add(c);
}
}
}
Color[] actualColours = ImageTools.GetColours(_bitmap);
Collection <Color> actualDistinctColours
= ImageTools.GetDistinctColours(actualColours);
Assert.AreEqual(expectedDistinctColours.Count,
actualDistinctColours.Count);
// NB we can't compare expected[i] to actual[i] as the two collections
// are in different orders due to the use of Hashtable in the
// GetDistinctColours method
foreach (Color thisColour in expectedDistinctColours)
{
CollectionAssert.Contains(actualDistinctColours, thisColour,
thisColour.ToString());
}
ReportEnd();
}
public void GetRgbSpeedComparisonTest()
{
ReportStart();
_bitmap = RandomBitmap.Create(new Size(1000, 1000), 100,
PixelFormat.Format32bppArgb);
_bitmap.Save("GetRgbSpeedComparisonTest.bmp");
Color[] colours = ImageTools.GetColours(_bitmap);
DateTime startTime;
DateTime endTime;
startTime = DateTime.Now;
Collection <byte> rgbCollection
= ImageTools.GetRgbCollection(colours);
endTime = DateTime.Now;
TimeSpan collectionRunTime = endTime - startTime;
WriteMessage("GetRgbCollection took " + collectionRunTime);
startTime = DateTime.Now;
byte[] rgbArray = ImageTools.GetRgbArray(colours);
endTime = DateTime.Now;
TimeSpan arrayRunTime = endTime - startTime;
WriteMessage("GetRgbArray took " + arrayRunTime);
// GetRgbArray should be quicker than GetRgbCollection. If not then
// there's probably something wrong with GetRgbArray
Assert.IsTrue(arrayRunTime < collectionRunTime);
Assert.AreEqual(rgbCollection.Count, rgbArray.Length);
for (int i = 0; i < rgbCollection.Count; i++)
{
string colourName;
int remainder;
int quotient = Math.DivRem(i, 3, out remainder);
switch (remainder)
{
case 0:
colourName = "red";
break;
case 1:
colourName = "green";
break;
case 2:
colourName = "blue";
break;
default:
throw new InvalidOperationException("unexpected remainder: " + remainder);
}
string message
= "Index: " + i + ", pixel " + quotient
+ " (" + colourName + ")";
Assert.AreEqual(rgbCollection[i], rgbArray[i], message);
}
ReportEnd();
}
