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Using FireMonkey’s filter effect without visible controls

Discussion in 'Delphi Android And IOS' started by N0body, Mar 14, 2014.

  1. N0body
    Online

    N0bodyN0body is a Verified Member DelphiFan Administrator Staff Member DF Staff

    The conventional way would be add a TImage with a TGlowEffect child control, and using MakeScreenshot to capture the result image. But I found this is not possible at least TGlowEffect do not work (or any other effects) when the control is not visible.

    The problem lead me to dig into FMX.Effects, FMX.Filter and FMX.Filter.Custom. This is what I found.

    Filters code are in FMX.Filter.Custom, TGlowFilter, TInnerGlowFilter, etc.
    They are registered to TFilterManager
    TGlowEffect component and other effect components uses TFilterManager to work
    Filter’s parameter can be set using ValueAsFloat, and ValueAsBitmap etc as long as you know the key string, e.g. ValuesAsFloat['BlurAmount'] := FSoftness
     

    Here is my code using GlowFilter manually.  Call GlowFilter.ApplyWithoutCopyToOutput will render a new image with the effect only, and I manually render the original image on top of it to make the actually resulted image.

    Code:
    with TFilterManager.FilterByName('GlowFilter') do
    begin
      ValuesAsFloat['BlurAmount'] := 0.2;
      ValuesAsColor['Color'] := $FFFFFFFF;
      ValuesAsBitmap['Input'] := icon;
      ApplyWithoutCopyToOutput;
      icon2.SetSize(icon.Width, icon.Height);
      TFilterManager.FilterContext.CopyToBitmap(icon2, Rect(0, 0, icon2.Width, icon2.Height));
      icon2.Canvas.BeginScene();
      try
        icon2.Canvas.DrawBitmap(icon, RectF(0, 0, icon.Width, icon.Height),
       RectF((icon2.Width-icon.Width)/2, (icon2.Height-icon.Height)/2,
       (icon2.Width-icon.Width)/2+icon.Width,
       (icon2.Height-icon.Height)/2+icon.Height), 1);
      finally
        icon2.Canvas.EndScene;
      end;
      fTrayicon.SetImage('normal', icon2);
     
  2. silicon
    Offline

    silicon DF Member

    thanks
     

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