FOR step := 32 DOWNTO 0 DO
BEGIN
FOR j := 0 TO Bitmap.Height-1 DO
BEGIN
RowBase := BitmapBase.Scanline[j];
Row := Bitmap.Scanline[j];
FOR i := 0 TO Bitmap.Width-1 DO
BEGIN // 32 = 2^5
Row[i].rgbtRed := (step * RowBase[i].rgbtRed ) SHR 5;
Row[i].rgbtGreen := (step * RowBase[i].rgbtGreen) SHR 5;
Row[i].rgbtBlue := (step * RowBase[i].rgbtBlue ) SHR 5
END
END;
ImageRGB.Picture.Graphic := Bitmap;
// Use API calls to avoid flicker.
// See VCL Repaint alternative in FadeIn
InvalidateRect(FormDaisy.Handle, NIL {whole window},
FALSE {don't erase background});
RedrawWindow(FormDaisy.Handle, NIL, 0, RDW_UPDATENOW);
END
FINALLY
Bitmap.Free;
END;
end;
FOR step := 0 TO 32 DO
BEGIN
FOR j := 0 TO Bitmap.Height-1 DO
BEGIN
RowBase := BitmapBase.Scanline[j];
Row := Bitmap.Scanline[j];
FOR i := 0 TO Bitmap.Width-1 DO
BEGIN // 32 = 2^5
Row[i].rgbtRed := (step * RowBase[i].rgbtRed ) SHR 5;
Row[i].rgbtGreen := (step * RowBase[i].rgbtGreen) SHR 5;
Row[i].rgbtBlue := (step * RowBase[i].rgbtBlue ) SHR 5
END
END;
// This is just as effective as the API calls.
// (See API call alternative in FadeOut.)
ImageRGB.Picture.Graphic := Bitmap;
ImageRGB.Repaint
END
FINALLY
Bitmap.Free;
END;
end;