public static uint ComputeAbsDiff(PixelElement Test, PixelElement Ref)
{
int R = Math.Abs((int)Test.r - (int)Ref.r);
int G = Math.Abs((int)Test.g - (int)Ref.g);
int B = Math.Abs((int)Test.b - (int)Ref.b);
return((uint)Math.Max(R, Math.Max(G, B)));
}
/*
* public void SetErrorColor(float squaredError)
* {
* a = 0xff;
*
* if (squaredError > 0.0f)
* {
* // no error is black, minor error is a noticeable color
* squaredError += 800;
* }
* squaredError /= 8;
*
* r = (byte)(Math.Min(0xff, squaredError));
* g = (byte)(Math.Min(0xff, squaredError / 8));
* b = (byte)(Math.Min(0xff, squaredError / 64));
* }
*/
public static float ComputeSquaredError(PixelElement Test, PixelElement Ref)
{
float R = (float)Test.r - (float)Ref.r;
float G = (float)Test.g - (float)Ref.g;
float B = (float)Test.b - (float)Ref.b;
return(R * R + G * G + B * B);
}
public static uint ComputeAbsDiff(PixelElement Test, PixelElement Ref)
{
int R = Math.Abs((int)Test.r - (int)Ref.r);
int G = Math.Abs((int)Test.g - (int)Ref.g);
int B = Math.Abs((int)Test.b - (int)Ref.b);
return (uint)Math.Max(R, Math.Max(G, B));
}
/*
public void SetErrorColor(float squaredError)
{
a = 0xff;
if (squaredError > 0.0f)
{
// no error is black, minor error is a noticeable color
squaredError += 800;
}
squaredError /= 8;
r = (byte)(Math.Min(0xff, squaredError));
g = (byte)(Math.Min(0xff, squaredError / 8));
b = (byte)(Math.Min(0xff, squaredError / 64));
}
*/
public static float ComputeSquaredError(PixelElement Test, PixelElement Ref)
{
float R = (float)Test.r - (float)Ref.r;
float G = (float)Test.g - (float)Ref.g;
float B = (float)Test.b - (float)Ref.b;
return R * R + G * G + B * B;
}
// compute imageDiff from imageTest and imageRef
public TestResult ComputeDiff(uint Threshold)
{
if (imageDiff != null)
{
imageDiff.Dispose();
imageDiff = null;
}
TestResult Ret = new TestResult();
if (imageTest == null)
{
Ret.ErrorText = "missing Test";
return(Ret);
}
if (imageRef == null)
{
Ret.ErrorText = "missing Ref";
return(Ret);
}
System.Drawing.Size sizeTest = GetImageSize(imageTest);
System.Drawing.Size sizeRef = GetImageSize(imageRef);
if (sizeTest != sizeRef)
{
Ret.ErrorText = "Size " +
sizeTest.Width.ToString() + "x" + sizeTest.Height.ToString() +
" != " +
sizeRef.Width.ToString() + "x" + sizeRef.Height.ToString();
return(Ret);
}
System.Drawing.Size size = GetImagesSize();
// todo: exit if Size or format is not the same
Debug.Assert(imageTest.PixelFormat == PixelFormat.Format32bppArgb);
imageDiff = new Bitmap(size.Width, size.Height);
uint CountedErrorPixels = 0;
BitmapData dataTest = imageTest.LockBits(new Rectangle(0, 0, size.Width, size.Height), ImageLockMode.ReadOnly, imageTest.PixelFormat);
BitmapData dataDiff = imageDiff.LockBits(new Rectangle(0, 0, size.Width, size.Height), ImageLockMode.WriteOnly, imageTest.PixelFormat);
BitmapData dataRef = imageRef.LockBits(new Rectangle(0, 0, size.Width, size.Height), ImageLockMode.ReadOnly, imageTest.PixelFormat);
unsafe
{
for (int x = 0; x < size.Width; ++x)
{
for (int y = 0; y < size.Height; ++y)
{
PixelElement *valueTest = (PixelElement *)((byte *)dataTest.Scan0.ToPointer() + dataTest.Stride * y + x * sizeof(PixelElement));
PixelElement *valueDiff = (PixelElement *)((byte *)dataDiff.Scan0.ToPointer() + dataDiff.Stride * y + x * sizeof(PixelElement));
PixelElement *valueRef = (PixelElement *)((byte *)dataRef.Scan0.ToPointer() + dataRef.Stride * y + x * sizeof(PixelElement));
// float Diff = PixelElement.ComputeSquaredError(*valueDiff, *valueRef);
uint localError = PixelElement.ComputeAbsDiff(*valueTest, *valueRef);
// all pixels opaque
valueDiff->a = 0xff;
if (localError >= Threshold)
{
++CountedErrorPixels;
// valueDiff->SetErrorColor(PixelElement.ComputeSquaredError(*valueTest, *valueRef));
valueDiff->SetErrorColor(localError);
// *valueDiff = *valueRef;
}
}
}
}
imageRef.UnlockBits(dataRef);
imageDiff.UnlockBits(dataDiff);
imageTest.UnlockBits(dataTest);
Ret.ErrorPixels = CountedErrorPixels;
// update Thumbnails
{
Ret.ThumbnailTest = resizeImage(imageTest);
Ret.ThumbnailDiff = resizeImage(imageDiff);
Ret.ThumbnailRef = resizeImage(imageRef);
}
return(Ret);
}