internal RectangleF GetCrop()
{
if (Zoom)
{
return(GetZoomCrop());
}
var salientBounds = SalientBoundingBox();
var idealCropSize = PolygonMath.ScaleInside(TargetSize, ImageSize);
var fits = PolygonMath.FitsInside(salientBounds.Size, idealCropSize);
// If there's no need to crop out a salient region, then center on the salient bounding box and align within the image bounds.
if (fits)
{
return(PolygonMath.AlignWithin(new RectangleF(PointF.Empty, idealCropSize),
new RectangleF(PointF.Empty, ImageSize), PolygonMath.Midpoint(salientBounds)));
}
if (NeverCropSalientArea)
{
var compromiseCrop = new SizeF(Math.Max(salientBounds.Width, idealCropSize.Width),
Math.Max(salientBounds.Height, idealCropSize.Height));
// Don't worry about 3 pixels or less, that's just annoying.
if (compromiseCrop.Width - idealCropSize.Width <= 3 &&
compromiseCrop.Height - idealCropSize.Height <= 3)
{
compromiseCrop = idealCropSize;
}
return(PolygonMath.AlignWithin(new RectangleF(PointF.Empty, compromiseCrop),
new RectangleF(PointF.Empty, ImageSize), PolygonMath.Midpoint(salientBounds)));
}
// Find the least bad crop (brute force)
var vertical = salientBounds.Height > idealCropSize.Height;
var choiceCount = vertical
? salientBounds.Height - idealCropSize.Height
: salientBounds.Width - idealCropSize.Width;
var searchArea = new RectangleF(vertical ? 0 : salientBounds.X, vertical ? salientBounds.Y : 0, vertical ? idealCropSize.Width : salientBounds.Width, vertical ? salientBounds.Height : idealCropSize.Height);
var initialWindow = PolygonMath.AlignWith(new RectangleF(PointF.Empty, idealCropSize), searchArea,
ContentAlignment.TopLeft);
double bestVolume = 0;
var bestCrop = initialWindow;
for (var i = 0; i < choiceCount; i++)
{
var window = initialWindow;
window.Offset(vertical ? 0 : i, vertical ? i : 0);
var volume = SalientArea.IntersectVolume(window, Regions);
if (volume > bestVolume)
{
bestVolume = volume;
bestCrop = window;
}
}
return(bestCrop);
}