private static Statistics RenderAndDiff(ImageGraphic control, ImageGraphic test, string controlName, string testName)
{
List <int> diffs = new List <int>();
using (Bitmap controlBitmap = new Bitmap(control.Columns, control.Rows))
{
using (Bitmap testBitmap = Render(test))
{
for (int x = 0; x < control.Columns; x++)
{
for (int y = 0; y < control.Rows; y++)
{
if (control is ColorImageGraphic)
{
Color controlColor = Color.FromArgb(control.PixelData.GetPixel(x, y));
Color testColor = testBitmap.GetPixel(x, y);
diffs.Add(Math.Abs(controlColor.R - testColor.R));
diffs.Add(Math.Abs(controlColor.G - testColor.G));
diffs.Add(Math.Abs(controlColor.B - testColor.B));
controlBitmap.SetPixel(x, y, controlColor);
}
else if (control is GrayscaleImageGraphic)
{
int range = 1 << ((GrayscaleImageGraphic)control).BitsStored;
int offset = ((GrayscaleImageGraphic)control).IsSigned ? -(range >> 1) : 0;
int v = (int)(256f * (control.PixelData.GetPixel(x, y) - offset) / range);
Color controlColor = Color.FromArgb(255, v, v, v);
Color testColor = testBitmap.GetPixel(x, y);
diffs.Add(Math.Abs(controlColor.R - testColor.R));
diffs.Add(Math.Abs(controlColor.G - testColor.G));
diffs.Add(Math.Abs(controlColor.B - testColor.B));
controlBitmap.SetPixel(x, y, controlColor);
}
else
{
Assert.Ignore("Unable to render and diff images of type {0}", control.GetType().FullName);
}
}
}
if (!string.IsNullOrEmpty(testName))
{
testBitmap.Save(testName);
}
}
if (!string.IsNullOrEmpty(controlName))
{
controlBitmap.Save(controlName);
}
}
return(new Statistics(diffs));
}