unit filterWaves;
(* ***** BEGIN LICENSE BLOCK *****
 * Copyright (C) 2004 Durand Emmanuel
 * Copyright (C) 2004 Burgel Eric
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Contact :
 *   filters@edurand.com
 *   filters@burgel.com
 *
 * ***** END LICENSE BLOCK ***** *)

{
 eburgel (filters@burgel.com)
}

interface
uses
  filter, fparameters, image, LacModel ;

type
  TFilterWaves = class(TFilter)
  public
    constructor Create; override;
    procedure setParameterImage(const aName: String; const aImage: PBitmap32); override ;
    procedure Run(); override;
  private
    parameterImageIn, parameterImageOut : TParameterImage;
    width, height : Integer ;
    lac : TLac ;
    procedure _run();
  end;

implementation

uses
  imageIO, Math ;

constructor TFilterWaves.Create;
begin
  inherited;
  parameterImageIn:=addParameterImage('inImage', 'input image to invert');
  parameterImageOut:=addParameterImage('outImage', 'result image of invertion');
  lac := nil ;
end;

procedure TFilterWaves.setParameterImage(const aName: String; const aImage: PBitmap32) ;
Var
  x, y : Integer ;
  pSrc : PColor32Array;
Begin
  inherited ;
  if aName = 'inImage' Then Begin
    width := aImage.Width ;
    height := aImage.Height ;
    lac.Free ;
    lac := TLac.create(width, height);
    for y := height-1 downto 0 do Begin
      pSrc := scanLine(aImage, y) ;
      for x := width-1 downto 0 do Begin
        lac.setPoint(x, y, Intensity(pSrc^[x])div 2);
      End ;
    End ;
    //lac.setPoint(width div 2, height div 2, 64) ;
  End ;
End ;

procedure TFilterWaves.Run();
begin
  if (parameterImageIn.Image<>nil) and (parameterImageOut.Image<>nil) then begin
    _run();
  end;
end;

procedure TFilterWaves._run();
var
  PDest : PColor32Array;
  x, y, maxX, maxY : Integer ;
  imgOut : PBitmap32 ;
  value : Single ;
begin
  imgOut := parameterImageOut.Image ;

  maxX := scanWidth(imgOut)-1 ;
  maxY := scanHeight(imgOut)-1 ;

  // Compute a single step
  lac.compute() ;

  for y:=0 to maxY do begin
    pDest := scanLine(imgOut, y) ;
    for x := 0 To maxX do Begin
      value := lac.getPoint(x, y) ;
      pDest^[0] := Gray32(floor(value)+128) ;
      inc(pDest) ;
    End ;
  end ;
end;

end.