/// <summary>
/// Converts pixels to DIPs in a way consistent with MIL. Protected here is okay
/// because ImageSource isn't extensible by 3rd parties.
/// </summary>
protected static double PixelsToDIPs(double dpi, int pixels)
{
// Obtain the natural size in MIL Device Independant Pixels (DIPs, or 1/96") of the bitmap.
// This is: (Bitmap Pixels) / (Bitmap DotsPerInch) * (DIPs per inch)
float dpif = (float)dpi;
// To be consistent with BitmapBrush
//
// Floating-point precision is used to maintain consistent
// logic with BitmapBrush DPI scaling, which is implemented in
// unmanaged code using single-precision math. Any changes to
// this logic must also be updated in the UCE BitmapBrush
// resource to maintain this consistency.
if (dpif < 0.0F || FloatUtil.IsCloseToDivideByZero(96.0F, dpif))
{
dpif = 96.0F;
}
return((double)(pixels * (96.0F / dpif)));
}
