{
Question:
 Does anyone know of a way that I can achieve the same effect on a bitmap
 that windows achieves when you single click on an icon on the desktop? In
 other words, I want to "sorta highlight" a bitmap and let the user know that
 it's selected.
Answer:
 To me it appears as if the icons on my desktop are highlighted by overlaying
 them with a certain color, so I guess the following routine is of use.
}

 procedure Highlight(aSource, ATarget: TBitmap; AColor: TColor);
 //alters ASource to ATarget by making it appear as if
//looked through
//colored glass as given by AColor
//ASource, ATarget must have been created.
//Isn't as slow as it looks.
//Physics courtesy of a post by K.H. Brenner
var i, j: Integer;
  s, t: pRGBTriple;
  r, g, b: byte;
  cl: TColor;
 begin
  cl := ColorToRGB(AColor);
  r := GetRValue(cl);
  g := GetGValue(cl);
  b := GetBValue(cl);
  aSource.PixelFormat := pf24bit;
  ATarget.PixelFormat := pf24bit;
  ATarget.Width := aSource.Width;
  ATarget.Height := aSource.Height;
  for i := 0 to aSource.Height - 1 do
  begin
  s := ASource.Scanline[i];
  t := ATarget.Scanline[i];
  for j := 0 to aSource.Width - 1 do
  begin
  t^.rgbtBlue := (b * s^.rgbtBlue) div 255;
  t^.rgbtGreen := (g * s^.rgbtGreen) div 255;
  t^.rgbtRed := (r * s^.rgbtRed) div 255;
  inc(s);
  inc(t);
  end;
  end;
 end;