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unit main;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ExtCtrls, StdCtrls,
ComCtrls, Spin, EditBtn, FPReadJpeg;
type
{ TForm1 }
TForm1 = class(TForm)
BtnWrite: TButton;
BtnRead: TButton;
CbApplyMinSize: TCheckBox;
CbGrayscale: TCheckBox;
LblProgressive: TLabel;
RbOtherFile: TRadioButton;
CbProgressive: TCheckBox;
CbSmoothing: TCheckBox;
EdFileName: TFileNameEdit;
RbUseCheetah: TRadioButton;
EdMinWidth: TSpinEdit;
EdMinHeight: TSpinEdit;
FilenamePanel: TPanel;
Image1: TImage;
Image2: TImage;
LblMinHeight: TLabel;
LblQualityLevel: TLabel;
LblSpeed: TLabel;
LblQuality: TLabel;
LblSizeInfo: TLabel;
PageControl: TPageControl;
Panel1: TPanel;
Panel2: TPanel;
RgScale: TRadioGroup;
RgPerformance: TRadioGroup;
SbQuality: TScrollBar;
ScrollBox1: TScrollBox;
ScrollBox2: TScrollBox;
PgRead: TTabSheet;
PgWrite: TTabSheet;
procedure BtnReadClick(Sender: TObject);
procedure BtnWriteClick(Sender: TObject);
procedure EdFileNameAcceptFileName(Sender: TObject; var Value: String);
procedure EdFileNameButtonClick(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure SbQualityChange(Sender: TObject);
private
function GetFileName: String;
public
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
const
CHEETAH_FILENAME = '../../images\splash_source/cheetah.jpg';
{ TForm1 }
procedure TForm1.BtnReadClick(Sender: TObject);
var
filename: String;
jpeg: TJpegImage;
t: TDateTime;
begin
fileName := GetFileName;
if fileName = '' then begin
MessageDlg('No filename', mtError, [mbOK], 0);
exit;
end;
if not FileExists(filename) then begin
MessageDlg(Format('File "%s" not found.', [filename]), mtError, [mbOK], 0);
exit;
end;
LblSpeed.Caption := 'Time to load: ...';
LblSpeed.Refresh;
jpeg := TJpegImage.Create;
try
t := now;
jpeg.Scale := TJPEGScale(RgScale.ItemIndex);
jpeg.Smoothing := CbSmoothing.Checked;
jpeg.Performance := TJPEGPerformance(RgPerformance.ItemIndex);
if CbApplyMinSize.Checked then begin
jpeg.MinWidth := EdMinWidth.Value;
jpeg.MinHeight := EdMinHeight.Value;
end;
jpeg.LoadFromFile(FILENAME);
t := now - t;
Image1.Picture.Assign(jpeg);
Image1.Width := Image1.Picture.Width;
Image1.Height := Image1.Picture.Height;
LblSizeInfo.Caption := Format('Size %d x %d', [jpeg.Width, jpeg.Height]);
LblSpeed.Caption := 'Time to load: ' + FormatDateTime('s.zzz', t) + ' s';
if jpeg.ProgressiveEncoding then
LblProgressive.Caption := 'Progressive encoding'
else
LblProgressive.Caption := '';
finally
jpeg.Free;
end;
end;
procedure TForm1.BtnWriteClick(Sender: TObject);
var
jpeg: TJpegImage;
fileName: String;
newFileName: String;
begin
fileName := GetFileName;
if fileName = '' then begin
MessageDlg('No filename', mtError, [mbOK], 0);
exit;
end;
if not FileExists(filename) then begin
MessageDlg(Format('File "%s" not found.', [filename]), mtError, [mbOK], 0);
exit;
end;
newFileName := ChangeFileExt(filename, '') + '_mod.jpg';
jpeg := TJpegImage.Create;
try
jpeg.LoadFromFile(filename);
jpeg.CompressionQuality := SbQuality.Position;
{$IF FPC_FullVersion >= 30004}
jpeg.GrayScale := CbGrayScale.Checked;
{$IFEND}
jpeg.ProgressiveEncoding := CbProgressive.Checked;
jpeg.SaveToFile(newFileName);
finally
jpeg.Free;
end;
jpeg := TJpegImage.Create;
try
jpeg.LoadFromFile(newFileName);
Image2.Picture.Assign(jpeg);
Image2.Width := Image2.Picture.Width;
Image2.Height := Image2.Picture.Height;
finally
jpeg.Free;
end;
end;
procedure TForm1.EdFileNameAcceptFileName(Sender: TObject; var Value: String);
begin
RbOtherFile.Checked := true;
end;
procedure TForm1.EdFileNameButtonClick(Sender: TObject);
begin
if EdFileName.FileName <> '' then
EdFileName.InitialDir := ExtractFileDir(EdFilename.Filename);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
LblProgressive.Caption := '';
BtnReadClick(nil);
SbQualityChange(nil);
{$IF FPC_FullVersion < 30004}
CbGrayScale.Enabled := false;
{$ENDIF}
end;
function TForm1.GetFileName: String;
begin
if RbUseCheetah.Checked then
Result := CHEETAH_FILENAME
else
Result := EdFileName.FileName;
end;
procedure TForm1.SbQualityChange(Sender: TObject);
begin
LblQualityLevel.Caption := IntToStr(SbQuality.Position);
end;
end.
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