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Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{
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;

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