private static FileEntry CalculateDiffImage(FileEntry oldImg, FileEntry newImg, double maxAllowedDiff, string errorMetric)
{
if (oldImg.Exists)
{
#if ENABLE_IMAGE_MAGICK
using (ImageMagick.MagickImage original = new ImageMagick.MagickImage()) {
original.LoadFromFileEntry(oldImg);
ImageMagick.ErrorMetric eM = EnumUtil.Parse <ImageMagick.ErrorMetric>(errorMetric);
var diff = original.Compare(newImg, eM, maxAllowedDiff);
if (diff != null)
{
return(diff);
}
else
{
newImg.CopyToV2(oldImg, replaceExisting: true);
}
}
#else
Log.d("AssertVisually.AssertNoVisualChange() skipped: ENABLE_IMAGE_MAGICK define not active, see instructions 'readme Image Magick Unity Installation Instructions.txt'");
#endif
}
else
{
newImg.CopyToV2(oldImg, replaceExisting: false);
}
return(null);
}
public static double Standardize(
this ImageMagick.ErrorMetric errorMetric,
double upperBound,
double value,
double transparencyRate = 0d)
{
const double STANDARD_UPPER_BOUND = 100d;
// Would add PEAK_CROSS_POINT and such but it'd bloat the code.
double result;
switch (errorMetric)
{
case ImageMagick.ErrorMetric.PeakSignalToNoiseRatio:
//result = value > 1d ? (double.IsPositiveInfinity(value) ? 1d : (1d - 1d / value) * 0.9375 + 0.0625)
// : value * 0.0625;
result = value > 1d ? (1d - 1d / value) * 0.9375 + 0.0625 : value * 0.0625;
break;
case ImageMagick.ErrorMetric.MeanErrorPerPixel:
case ImageMagick.ErrorMetric.Absolute:
result = value / upperBound;
break;
case ImageMagick.ErrorMetric.StructuralDissimilarity:
result = value * 2;
break;
case ImageMagick.ErrorMetric.StructuralSimilarity:
case ImageMagick.ErrorMetric.NormalizedCrossCorrelation:
result = value;
break;
default:
result = 1d - value;
break;
}
if (transparencyRate > 0d)
{
if (transparencyRate < 1d)
{
result = (result - transparencyRate) / (1 - transparencyRate);
}
else
{
return(double.NaN);
}
}
return(Math.Max(0d, Math.Min(STANDARD_UPPER_BOUND, result * STANDARD_UPPER_BOUND)));
}
public static double UpperBound(this ImageMagick.ErrorMetric errorMetric, int pixelCount, int channels, int bitDepth = 255)
{
switch (errorMetric)
{
case ImageMagick.ErrorMetric.PeakSignalToNoiseRatio: return(double.PositiveInfinity);
case ImageMagick.ErrorMetric.MeanErrorPerPixel: return(pixelCount * channels * bitDepth);
case ImageMagick.ErrorMetric.Absolute: return(pixelCount);
case ImageMagick.ErrorMetric.StructuralDissimilarity: return(0.5);
default: return(1d);
}
}
