procedure SetBorderTransparent(ABitmap: TCustomBitmap32; ARect: TRect);


This is an auxiliary function that sets the alpha channel along the edges of specified rectangle to zero. It may be used on a bitmap before passing it to Transform function as a workarownd to the edge antialiasing problem. For a dynamic option see TPixelAccessMode pamTransparentEdge, which can do the same trick without any destructive editing.

See Also

TCustomBitmap32, Rectangle Types, TPixelAccessMode, Transform