Antialiasing

[Sanchez]

hallo erstmal,

Ich habe eine Funktion fürs Antialiasing auf einem Canvas aufgetrieben.

Delphi-Quellcode:

procedure Antialiasing(C: TCanvas; Rect: TRect; Percent: Integer);
var
  l, p: Integer;
  R, G, B: Integer;
  R1, R2, G1, G2, B1, B2: Byte;
begin
  with c do
  begin
    Brush.Style := bsclear;
    for l := Rect.Top to Rect.Bottom do begin
      for p := Rect.Left to Rect.Right do begin
        R1 := GetRValue(Pixels[p, l]);
        G1 := GetGValue(Pixels[p, l]);
        B1 := GetBValue(Pixels[p, l]);

        //Pixel links
        //Pixel left
        R2 := GetRValue(Pixels[p - 1, l]);
        G2 := GetGValue(Pixels[p - 1, l]);
        B2 := GetBValue(Pixels[p - 1, l]);

        if (R1 <> R2) or (G1 <> G2) or (B1 <> B2) then begin
          R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
          G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
          B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
          Pixels[p - 1, l] := RGB(R, G, B);
        end;

        //Pixel rechts
        //Pixel right
        R2 := GetRValue(Pixels[p + 1, l]);
        G2 := GetGValue(Pixels[p + 1, l]);
        B2 := GetBValue(Pixels[p + 1, l]);

        if (R1 <> R2) or (G1 <> G2) or (B1 <> B2) then begin
          R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
          G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
          B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
          Pixels[p + 1, l] := RGB(R, G, B);
        end;

        //Pixel oben
        //Pixel up
        R2 := GetRValue(Pixels[p, l - 1]);
        G2 := GetGValue(Pixels[p, l - 1]);
        B2 := GetBValue(Pixels[p, l - 1]);

        if (R1 <> R2) or (G1 <> G2) or (B1 <> B2) then begin
          R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
          G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
          B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
          Pixels[p, l - 1] := RGB(R, G, B);
        end;

        //Pixel unten
        //Pixel down
        R2 := GetRValue(Pixels[p, l + 1]);
        G2 := GetGValue(Pixels[p, l + 1]);
        B2 := GetBValue(Pixels[p, l + 1]);

        if (R1 <> R2) or (G1 <> G2) or (B1 <> B2) then begin
          R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
          G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
          B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
          Pixels[p, l + 1] := RGB(R, G, B);
        end;
      end;
    end;
  end;
end;

Allerdings ist der Code ziemlich langsam. Hat jemand eine Idee wie ich ihn perfomanter machen kann?

grüße, daniel