protected override RequestedAction LayoutImage(ImageState s)
{
//Only activated if both width and height are specified, and mode=crop.
if (s.settings.Mode != FitMode.Crop || s.settings.Width < 0 || s.settings.Height < 0)
{
return(RequestedAction.None);
}
var finalMode = s.settings.Get("c.finalmode", FitMode.Pad);
var regions = SalientArea.FromQuery(s.settings);
if (regions.Length == 0)
{
return(RequestedAction.None);
}
var a = new Aligner {
Regions = regions,
ImageSize = s.originalSize,
TargetSize = new Size(s.settings.Width, s.settings.Height),
NeverCropSalientArea = finalMode != FitMode.Crop,
Zoom = regions[0].Area.Width > 0 && regions[0].Area.Height > 0 && s.settings.Get("c.zoom", false)
};
s.copyRect = a.GetCrop();
s.ValidateCropping();
//So, if we haven't met the aspect ratio yet, what mode will we pass on?
s.settings.Mode = finalMode;
return(RequestedAction.None);
}
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);
}
