unit filterCopy;
(* ***** 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
 * Site :
 *   http://filters.sourceforge.net/
 *
 * ***** END LICENSE BLOCK ***** *)

{
 edurand (filters@edurand.com)
}

interface
uses
  filter, fparameters, image, SysUtils;

type
  TFilterCopy = class(TFilter)
  public
    constructor Create; override;
    destructor Destroy; override;
    procedure Run(); override;
  private
    parameterImageIn : TParameterImage;
    parameterOutputColor : TParameterString;
    outputparameterImageOut : TParameterImage;
    outImage : PBitmap32;
    imgIn : PBitmap32 ;
    procedure _run();
    procedure deleteImages;
  end;

implementation
uses
  imageIO, Math;

constructor TFilterCopy.Create;
begin
  inherited;
  parameterImageIn := addParameterImage( 'inImage', 'image to copy' );
  parameterOutputColor := addParameterString( 'outputColor', 'UNCHANGED/INTENSITY','UNCHANGED' );
  outputparameterImageOut := addOutputParameterImage( 'outImage', 'outImage' );
end;

destructor TFilterCopy.Destroy;
begin
  deleteImages;
  inherited;
end;

procedure TFilterCopy.deleteImages;
begin
  image.freeImage(outImage);
end;

procedure TFilterCopy.Run();
begin
  imgIn  := parameterImageIn.Image ;
  if (imgIn<>nil) then begin
    _run();
  end;
end;

procedure TFilterCopy._run();
var
  pSrc, PDest : PColor32Array;
  imgOutWidth, imageOutHeight : Integer;
  x, y, maxX, maxY : Integer ;
  imgOut : PBitmap32 ;
  c : TColor32;
  mode : Byte;
  tIntensity : Byte;
begin
  mode := 0;
  if parameterOutputColor.Value='INTENSITY' then mode :=1;
  deleteImages;
  imgOutWidth := scanWidth(imgIn);
  imageOutHeight := scanHeight(imgIn);
  maxX := imgOutWidth-1;
  maxY := imageOutHeight-1;
  outImage := createImage(imgOutWidth,imageOutHeight);
  imgOut := outImage;
  eraseImage(imgOut);
  for y:=0 to maxY do begin
    pDest := imgOut.Bits;
    Inc(pDest,y*imgOutWidth);
    pSrc := scanLine(imgIn, y) ;
    for x:=0 to maxX do begin
      case mode of
      0 : begin
          pDest^[0] := pSrc^[0];
          end;
      1 : begin
            c := pSrc^[0];
            tIntensity :=
              (
                (Byte(c shr 16) * 61) +
                (Byte(c shr 8) * 174) +
                (Byte(c) * 21)
              ) shr 8;
            pDest^[0] := TColor32(0) shl 24 + TColor32(tIntensity) shl 16 + TColor32(tIntensity) shl 8 + TColor32(tIntensity);
          end;
      end;
      inc(pDest) ;
      inc(pSrc) ;
    end ;
  end ;
  setOutputParameterImage( 'outImage', outImage );
end;


end.