public override ImageSimilarityReport <TPixelA, TPixelB> CompareImages <TPixelA, TPixelB>(Image <TPixelA> expected, Image <TPixelB> actual)
{
if (expected.Size() != actual.Size())
{
throw new InvalidOperationException("Calling ImageComparer is invalid when dimensions mismatch!");
}
int width = actual.Width;
// TODO: Comparing through Rgba64 may not robust enough because of the existence of super high precision pixel types.
var aBuffer = new Vector4[width];
var bBuffer = new Vector4[width];
float totalDifference = 0F;
var differences = new List <PixelDifference>();
var configuration = new ImageSharp.Configuration();
for (int y = 0; y < actual.Height; y++)
{
Span <TPixelA> aSpan = expected.GetPixelRowSpan(y);
Span <TPixelB> bSpan = actual.GetPixelRowSpan(y);
PixelOperations <TPixelA> .Instance.ToVector4(configuration, aSpan, aBuffer);
PixelOperations <TPixelB> .Instance.ToVector4(configuration, bSpan, bBuffer);
for (int x = 0; x < width; x++)
{
float d = GetManhattanDistanceInRgbaSpace(ref aBuffer[x], ref bBuffer[x]);
if (d > this.PerPixelManhattanThreshold)
{
var diff = new PixelDifference(new Point(x, y), aBuffer[x], bBuffer[x]);
differences.Add(diff);
totalDifference += d;
}
}
}
float normalizedDifference = totalDifference / (actual.Width * (float)actual.Height);
normalizedDifference /= 4F * 65535F;
if (normalizedDifference > this.ImageThreshold)
{
return(new ImageSimilarityReport <TPixelA, TPixelB>(expected, actual, differences, normalizedDifference));
}
else
{
return(ImageSimilarityReport <TPixelA, TPixelB> .Empty);
}
}
public override ImageSimilarityReport <TPixelA, TPixelB> CompareImages <TPixelA, TPixelB>(
Image <TPixelA> expected,
Image <TPixelB> actual)
{
if (expected.Size() != actual.Size())
{
throw new InvalidOperationException("Calling ImageComparer is invalid when dimensions mismatch!");
}
int width = actual.Width;
// TODO: Comparing through Rgba64 may not be robust enough because of the existence of super high precision pixel types.
var aBuffer = new Vector4[width];
var bBuffer = new Vector4[width];
var differences = new List <PixelDifference>();
ImageSharp.Configuration configuration = expected.GetConfiguration();
for (int y = 0; y < actual.Height; y++)
{
Span <TPixelA> aSpan = expected.GetPixelRowSpan(y);
Span <TPixelB> bSpan = actual.GetPixelRowSpan(y);
PixelOperations <TPixelA> .Instance.ToVector4(configuration, aSpan, aBuffer);
PixelOperations <TPixelB> .Instance.ToVector4(configuration, bSpan, bBuffer);
for (int x = 0; x < width; x++)
{
Vector4 aPixel = aBuffer[x];
Vector4 bPixel = bBuffer[x];
if (aPixel != bPixel)
{
var diff = new PixelDifference(new Point(x, y), aPixel, bPixel);
differences.Add(diff);
}
}
}
return(new ImageSimilarityReport <TPixelA, TPixelB>(expected, actual, differences));
}