/// <summary>
/// Find based on the fitting pixel size
/// </summary>
IconFrame FindBySize(float scale, Size fittingSize)
{
// adjust fitting size to scale to get pixel size desired
fittingSize = Size.Ceiling((SizeF)fittingSize * scale);
var fs = fittingSize.Width * fittingSize.Height;
var frame = Frames
.Select(r => Tuple.Create(r.PixelSize.Width * r.PixelSize.Height, r))
.OrderBy(r => r.Item1)
.FirstOrDefault(r => r.Item1 >= fs)?.Item2;
return(frame ?? Frames.OrderBy(r => r.PixelSize.Width * r.PixelSize.Height).Last());
}
/// <summary>
/// find based on scale alone, we don't know the final render size
/// </summary>
IconFrame FindByScale(float scale)
{
IconFrame selected = null;
float scaleDiff = 0;
float lastScale = 0;
foreach (var frame in Frames.OrderBy(r => r.Scale).ThenByDescending(r => r.Size.Width * r.Size.Height))
{
var ps = Size.Ceiling((SizeF)Size * scale);
var pixelSizeNeeded = ps.Width * ps.Height;
var diff = scale - frame.Scale;
if (selected == null || (diff < scaleDiff && (diff >= 0 || scaleDiff > 0)))
{
// found where scale is the next greater or equal to desired scale
scaleDiff = diff;
lastScale = frame.Scale;
selected = frame;
}
else if (lastScale == frame.Scale)
{
// multiple resolutions with the same scale, use the one with the best pixel size
// (e.g. ico file with multiple resolutions)
ps = frame.PixelSize;
if (ps.Width * ps.Height >= pixelSizeNeeded)
{
selected = frame;
scaleDiff = diff;
lastScale = frame.Scale;
}
else
{
break;
}
}
else
{
break;
}
}
if (selected == null)
{
// get largest
selected = Frames.OrderBy(r => r.PixelSize.Width * r.PixelSize.Height).Last();
}
return(selected);
}