galfar.imaginglib/Demos/ObjectPascal/LCLImager/mainunit.pas

{
  Vampyre Imaging Library Demo
  LCL Imager (ObjectPascal, high level/component sets/canvas, Win32/Linux)
  tested in Lazarus 0.9.18
  written by Marek Mauder

  Simple image manipulator program which shows usage of Imaging VCL/CLX/LCL
  classes (TImagingGraphic and its descendants) to display images on form.
  It also uses high level image classes and some low level functions.
  Demo uses TMultiImage class to store images (loaded from one file - MNG, DDS)
  which can be modified by user. After each modification image
  is assigned to TImagingBitmap class which provides visualization
  on the app form (using standard TImage component). Demo also uses new
  TImagingCanvas class to do some effects.
  
  In File menu you can open new image and save the current one. Items in
  View menu provide information about the current image and controls
  how it is displayed. You can also select next and previous subimage if loaded file
  contains more than one image. Format menu allows you to convert image
  to different image data formats supported by Imaging. Manipulate
  menu allows you to enlarge/shrink/flip/mirror/swap channels/other
  of the current image. Effects menu allows you to apply various effects to the
  image (provided by TImagingCanvas).
}

unit MainUnit;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs,
  Menus, ExtCtrls, ExtDlgs, DemoUtils, AboutUnit, ActnList,
  ImagingTypes,
  Imaging,
  ImagingClasses,
  ImagingComponents,
  ImagingCanvases,
  ImagingUtility;

type

  { TMainForm }

  TMainForm = class(TForm)
    ActViewInfo: TAction;
    ActViewFitToWindow: TAction;
    ActViewRealSize: TAction;
    ActionList1: TActionList;
    Image: TImage;
    MainMenu: TMainMenu;
    MenuItem1: TMenuItem;
    MenuItem10: TMenuItem;
    MenuItem11: TMenuItem;
    MenuItem12: TMenuItem;
    MenuItem13: TMenuItem;
    MenuItem14: TMenuItem;
    MenuItem15: TMenuItem;
    MenuItem16: TMenuItem;
    MenuItem17: TMenuItem;
    FormatItem: TMenuItem;
    MenuItem18: TMenuItem;
    MenuItem19: TMenuItem;
    MenuItem2: TMenuItem;
    MenuItem20: TMenuItem;
    MenuItem21: TMenuItem;
    MenuItem22: TMenuItem;
    MenuItem23: TMenuItem;
    MenuItem24: TMenuItem;
    MenuItem25: TMenuItem;
    MenuItem26: TMenuItem;
    MenuItem27: TMenuItem;
    MenuItem28: TMenuItem;
    MenuItem29: TMenuItem;
    MenuItem3: TMenuItem;
    MenuItem30: TMenuItem;
    MenuItem31: TMenuItem;
    MenuItem32: TMenuItem;
    MenuItem33: TMenuItem;
    MenuItem36: TMenuItem;
    MenuItem37: TMenuItem;
    MenuItem38: TMenuItem;
    MenuItem39: TMenuItem;
    MenuItem40: TMenuItem;
    MenuItem41: TMenuItem;
    MenuItem42: TMenuItem;
    MenuItem43: TMenuItem;
    MenuItem44: TMenuItem;
    MenuItem46: TMenuItem;
    MenuItemActSubImage: TMenuItem;
    MenuItem34: TMenuItem;
    MenuItem35: TMenuItem;
    MenuItem4: TMenuItem;
    MenuItem5: TMenuItem;
    MenuItem6: TMenuItem;
    MenuItem7: TMenuItem;
    MenuItem8: TMenuItem;
    MenuItem9: TMenuItem;
    OpenD: TOpenPictureDialog;
    SaveD: TSavePictureDialog;
    procedure ActViewFitToWindowExecute(Sender: TObject);
    procedure ActViewInfoExecute(Sender: TObject);
    procedure ActViewRealSizeExecute(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure ImageClick(Sender: TObject);
    procedure MenuItem10Click(Sender: TObject);
    procedure MenuItem12Click(Sender: TObject);
    procedure MenuItem13Click(Sender: TObject);
    procedure MenuItem14Click(Sender: TObject);
    procedure MenuItem15Click(Sender: TObject);
    procedure MenuItem18Click(Sender: TObject);
    procedure MenuItem19Click(Sender: TObject);
    procedure MenuItem20Click(Sender: TObject);
    procedure MenuItem23Click(Sender: TObject);
    procedure MenuItem24Click(Sender: TObject);
    procedure MenuItem26Click(Sender: TObject);
    procedure MenuItem27Click(Sender: TObject);
    procedure MenuItem28Click(Sender: TObject);
    procedure MenuItem29Click(Sender: TObject);
    procedure MenuItem2Click(Sender: TObject);
    procedure MenuItem30Click(Sender: TObject);
    procedure MenuItem31Click(Sender: TObject);
    procedure MenuItem33Click(Sender: TObject);
    procedure MenuItem34Click(Sender: TObject);
    procedure MenuItem35Click(Sender: TObject);
    procedure MenuItem37Click(Sender: TObject);
    procedure MenuItem38Click(Sender: TObject);
    procedure MenuItem39Click(Sender: TObject);
    procedure MenuItem3Click(Sender: TObject);
    procedure MenuItem40Click(Sender: TObject);
    procedure MenuItem41Click(Sender: TObject);
    procedure MenuItem42Click(Sender: TObject);
    procedure MenuItem43Click(Sender: TObject);
    procedure MenuItem44Click(Sender: TObject);
    procedure MenuItem46Click(Sender: TObject);
    procedure MenuItem4Click(Sender: TObject);
    procedure MenuItem5Click(Sender: TObject);
    procedure MenuItem7Click(Sender: TObject);
    procedure FormatChangeClick(Sender: TObject);
  private
    FBitmap: TImagingBitmap;
    FImage: TMultiImage;
    FImageCanvas: TImagingCanvas;
    FFileName: string;
    procedure OpenFile(const FileName: string);
    procedure SelectSubimage(Index: LongInt);
    procedure UpdateView;
    function CheckCanvasFormat: Boolean;
  public

  end; 

const
  SWindowTitle = 'LCL Imager - Vampyre Imaging Library %s Demo';
var
  MainForm: TMainForm;

implementation

{ TMainForm }

procedure TMainForm.MenuItem10Click(Sender: TObject);
begin
  AboutForm.ShowModal;
end;

procedure TMainForm.MenuItem12Click(Sender: TObject);
begin
  SwapChannels(FImage.ImageDataPointer^, ChannelRed, ChannelBlue);
  UpdateView;
end;

procedure TMainForm.MenuItem13Click(Sender: TObject);
begin
  SwapChannels(FImage.ImageDataPointer^, ChannelRed, ChannelGreen);
  UpdateView;
end;

procedure TMainForm.MenuItem14Click(Sender: TObject);
begin
  SwapChannels(FImage.ImageDataPointer^, ChannelGreen, ChannelBlue);
  UpdateView;
end;

procedure TMainForm.MenuItem15Click(Sender: TObject);
begin
  ReduceColors(FImage.ImageDataPointer^, 1024);
  UpdateView;
end;

procedure TMainForm.MenuItem18Click(Sender: TObject);
begin
  ReduceColors(FImage.ImageDataPointer^, 256);
  UpdateView;
end;

procedure TMainForm.MenuItem19Click(Sender: TObject);
begin
  ReduceColors(FImage.ImageDataPointer^, 64);
  UpdateView;
end;

procedure TMainForm.MenuItem20Click(Sender: TObject);
begin
  ReduceColors(FImage.ImageDataPointer^, 16);
  UpdateView;
end;

procedure TMainForm.MenuItem23Click(Sender: TObject);
begin
  FImage.Rotate(-90);
  UpdateView;
end;

procedure TMainForm.MenuItem24Click(Sender: TObject);
begin
  FImage.Rotate(90);
  UpdateView;
end;

procedure TMainForm.MenuItem26Click(Sender: TObject);
begin
  FImage.Resize(FImage.Width div 2, FImage.Height div 2, rfNearest);
  UpdateView;
end;

procedure TMainForm.MenuItem27Click(Sender: TObject);
begin
  FImage.Resize(FImage.Width div 2, FImage.Height div 2, rfBilinear);
  UpdateView;
end;

procedure TMainForm.MenuItem28Click(Sender: TObject);
begin
  FImage.Resize(FImage.Width div 2, FImage.Height div 2, rfBicubic);
  UpdateView;
end;

procedure TMainForm.MenuItem29Click(Sender: TObject);
begin
  FImage.Resize(FImage.Width * 2, FImage.Height * 2, rfNearest);
  UpdateView;
end;

procedure TMainForm.MenuItem2Click(Sender: TObject);
begin
  FImage.Flip;;
  UpdateView;
end;

procedure TMainForm.MenuItem30Click(Sender: TObject);
begin
  FImage.Resize(FImage.Width * 2, FImage.Height * 2, rfBilinear);
  UpdateView;
end;

procedure TMainForm.MenuItem31Click(Sender: TObject);
begin
  FImage.Resize(FImage.Width * 2, FImage.Height * 2, rfBicubic);
  UpdateView;
end;

procedure TMainForm.MenuItem33Click(Sender: TObject);
begin
  ReduceColors(FImage.ImageDataPointer^, 2);
  UpdateView;
end;

procedure TMainForm.MenuItem34Click(Sender: TObject);
begin
  SelectSubimage(FImage.ActiveImage + 1);
end;

procedure TMainForm.MenuItem35Click(Sender: TObject);
begin
  SelectSubimage(FImage.ActiveImage - 1);
end;

function TMainForm.CheckCanvasFormat: Boolean;
begin
  Result := FImage.Format in FImageCanvas.GetSupportedFormats;
  if not Result then
    MessageDlg('Image is in format that is not supported by TImagingCanvas.', mtError, [mbOK], 0);
end;

procedure TMainForm.MenuItem37Click(Sender: TObject);
begin
  if CheckCanvasFormat then
  begin
    FImageCanvas.CreateForImage(FImage);
    FImageCanvas.ApplyConvolution3x3(FilterGaussian3x3);
    UpdateView;
  end;
end;

procedure TMainForm.MenuItem38Click(Sender: TObject);
begin
  if CheckCanvasFormat then
  begin
    FImageCanvas.CreateForImage(FImage);
    FImageCanvas.ApplyConvolution5x5(FilterGaussian5x5);
    UpdateView;
  end;
end;

procedure TMainForm.MenuItem39Click(Sender: TObject);
begin
  if CheckCanvasFormat then
  begin
    FImageCanvas.CreateForImage(FImage);
    FImageCanvas.ApplyConvolution3x3(FilterSharpen3x3);
    UpdateView;
  end;
end;

procedure TMainForm.FormCreate(Sender: TObject);
var
  Item: TMenuItem;
  Fmt: TImageFormat;
  Info: TImageFormatInfo;
begin
  Caption := Format(SWindowTitle, [Imaging.GetVersionStr]);

  { Source image and Image's graphic are created and
    default image is opened.}
  FImage := TMultiImage.Create;
  FBitmap := TImagingBitmap.Create;
  Image.Picture.Graphic := FBitmap;
  FImageCanvas := TImagingCanvas.Create;

  { This builds Format submenu containing all possible
    image data formats (it dos not start at Low(TImageFormat)
    because there are some helper formats). Format for each item
    is stored in its Tag for later use in OnClick event.}
  for Fmt := ifIndex8 to High(TImageFormat) do
  begin
    GetImageFormatInfo(Fmt, Info);
    if Info.Name <> '' then
    begin
      Item := TMenuItem.Create(MainMenu);
      Item.Caption := Info.Name;
      Item.Tag := Ord(Fmt);
      Item.OnClick := @FormatChangeClick;
      FormatItem.Add(Item);
    end;
  end;
  
  if (ParamCount > 0) and FileExists(ParamStr(1)) then
    OpenFile(ParamStr(1))
  else
    OpenFile(GetDataDir + PathDelim + 'Tigers.jpg');
end;

procedure TMainForm.FormatChangeClick(Sender: TObject);
begin
  with Sender as TMenuItem do
  begin
    FImage.Format := TImageFormat(Tag);
    UpdateView;
  end;
end;

procedure TMainForm.ActViewRealSizeExecute(Sender: TObject);
begin
  ActViewRealSize.Checked := not ActViewRealSize.Checked;
  ActViewFitToWindow.Checked := not ActViewFitToWindow.Checked;
  if ActViewRealSize.Checked then
  begin
    Image.Proportional := False;
    Image.Stretch := False;
    Image.AutoSize := True;
  end;
end;

procedure TMainForm.ActViewFitToWindowExecute(Sender: TObject);
begin
  ActViewFitToWindow.Checked := not ActViewFitToWindow.Checked;
  ActViewRealSize.Checked := not ActViewRealSize.Checked;
  if ActViewFitToWindow.Checked then
  begin
    Image.Proportional := True;
    Image.AutoSize := False;
    Image.Stretch := True;
  end;
end;

procedure TMainForm.ActViewInfoExecute(Sender: TObject);
begin
  MessageDlg('Image Info: ' + ImageToStr(FImage.ImageDataPointer^), mtInformation, [mbOK], 0);
end;

procedure TMainForm.FormDestroy(Sender: TObject);
begin
  FImageCanvas.Free;
  FBitmap.Free;
  FImage.Free;
end;

procedure TMainForm.ImageClick(Sender: TObject);
begin
  ActViewInfo.Execute;
end;

procedure TMainForm.MenuItem3Click(Sender: TObject);
begin
  OpenD.Filter := GetImageFileFormatsFilter(True);
  if OpenD.Execute then
    OpenFile(OpenD.FileName);
end;

procedure TMainForm.MenuItem40Click(Sender: TObject);
begin
  if CheckCanvasFormat then
  begin
    FImageCanvas.CreateForImage(FImage);
    FImageCanvas.ApplyConvolution5x5(FilterSharpen5x5);
    UpdateView;
  end;
end;

procedure TMainForm.MenuItem41Click(Sender: TObject);
begin
  if CheckCanvasFormat then
  begin
    FImageCanvas.CreateForImage(FImage);
    FImageCanvas.ApplyConvolution5x5(FilterGaussian5x5);
    FImageCanvas.ApplyConvolution5x5(FilterLaplace5x5);
    UpdateView;
  end;
end;

procedure TMainForm.MenuItem42Click(Sender: TObject);
begin
  if CheckCanvasFormat then
  begin
    FImageCanvas.CreateForImage(FImage);
    FImageCanvas.ApplyConvolution3x3(FilterGaussian3x3);
    FImageCanvas.ApplyConvolution3x3(FilterSobelHorz3x3);
    UpdateView;
  end;
end;

procedure TMainForm.MenuItem43Click(Sender: TObject);
begin
  if CheckCanvasFormat then
  begin
    FImageCanvas.CreateForImage(FImage);
    FImageCanvas.ApplyConvolution3x3(FilterGaussian3x3);
    FImageCanvas.ApplyConvolution3x3(FilterSobelVert3x3);
    UpdateView;
  end;
end;

procedure TMainForm.MenuItem44Click(Sender: TObject);
begin
  OpenFile(FFileName);
end;

procedure TMainForm.MenuItem46Click(Sender: TObject);
const
  FilterEmboss3x3: TConvolutionFilter3x3 = (
    Kernel: ((2,  0,  0),
             (0, -1,  0),
             (0,  0, -1));
    Divisor: 1);

begin
  FImage.Format := ifGray8;
  FImageCanvas.CreateForImage(FImage);
  FImageCanvas.ApplyConvolution3x3(FilterGaussian3x3);
  FImageCanvas.ApplyConvolution(@FilterEmboss3x3.Kernel, 3, FilterEmboss3x3.Divisor, 0.5);
  UpdateView;
end;

procedure TMainForm.MenuItem4Click(Sender: TObject);
begin
  FImage.Mirror;
  UpdateView;
end;

procedure TMainForm.MenuItem5Click(Sender: TObject);
begin
  SaveD.Filter := GetImageFileFormatsFilter(False);
  SaveD.FileName := ChangeFileExt(ExtractFileName(FFileName), '');
  SaveD.FilterIndex := GetExtensionFilterIndex(GetFileExt(FFileName), False);
  if SaveD.Execute then
  begin
    FFileName := ChangeFileExt(SaveD.FileName, '.' + GetFilterIndexExtension(SaveD.FilterIndex, False));
    FImage.SaveToFile(FFileName);
  end;
end;

procedure TMainForm.MenuItem7Click(Sender: TObject);
begin
  Close;
end;

procedure TMainForm.OpenFile(const FileName: string);
begin
  FFileName := FileName;
  FImage.LoadMultiFromFile(FileName);
  SelectSubimage(0);
end;

procedure TMainForm.SelectSubimage(Index: LongInt);
begin
  FImage.ActiveImage := Index;
  MenuItemActSubImage.Caption := Format('Active Subimage: %d/%d', [FImage.ActiveImage + 1, FImage.ImageCount]);
  UpdateView;
end;

procedure TMainForm.UpdateView;
begin
  Image.Picture.Graphic.Assign(FImage);
end;

initialization
  {$I mainunit.lrs}

{
  File Notes:

  -- TODOS ----------------------------------------------------
    - add more canvas stuff when it will be avaiable

  -- 0.19 Changes/Bug Fixes -----------------------------------
    - you can now open image in Imager from shell by passing
      path to image as parameter: 'LCLImager /home/myimage.jpg'
    - added Reload from File menu to reload image from disk
      (poor man's Undo)
    - added Effects menu with some convolution filters
    - added support for displaying of multi images

  -- 0.17 Changes/Bug Fixes -----------------------------------
    - added Nearest, Bilinear, and Bicubic filter options to
      Resize To 50/200% menu items
    - better handling of file exts when using save dialog
    - added rotations to Manipulate menu
    - now works well in Linux too

  -- 0.15 Changes/Bug Fixes -----------------------------------
    - created
}

end.