TImage32.Skew

procedure Skew(dx, dy: double);

dx represents the horizontal skew where dx is expressed as a fraction of the image's height. Likewise, dy represents the vertical skew where dy is expressed as a fraction of the image's width. (Negative values will reverse the direction of skew).
dx and dy are each limited to the range -2.0 ... 2.0.

uses Img32, Img32.Fmt.PNG;
...
img := TImage32.Create;
img.LoadFromFile('beetle.png');
img.Skew(0.5, 0);
img.SaveToFile('beetle_skewed.png');
img.Free;

Before:

After: