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{ Copyright (C) 2003 Mattias Gaertner
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program 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 Library General Public License
for more details.
You should have received a copy of the GNU Library 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.
}
unit Ulazjpeg;
{$mode objfpc}{$H+}
interface
uses
SysUtils, Classes, FPImage, IntfGraphics, Graphics, FPReadJPEG, FPWriteJPEG;
type
TJPEGQualityRange = TFPJPEGCompressionQuality;
TJPEGPerformance = TJPEGReadPerformance;
TJPEGImage = class(TFPImageBitmap)
private
FPerformance: TJPEGPerformance;
FProgressiveEncoding: boolean;
FQuality: TJPEGQualityRange;
protected
procedure InitFPImageReader(ImgReader: TFPCustomImageReader); override;
procedure FinalizeFPImageReader(ImgReader: TFPCustomImageReader); override;
procedure InitFPImageWriter(ImgWriter: TFPCustomImageWriter); override;
public
constructor Create; override;
class function GetFileExtensions: string; override;
class function GetDefaultFPReader: TFPCustomImageReaderClass; override;
class function GetDefaultFPWriter: TFPCustomImageWriterClass; override;
public
property CompressionQuality: TJPEGQualityRange read FQuality write FQuality;
property ProgressiveEncoding: boolean read FProgressiveEncoding;
property Performance: TJPEGPerformance read FPerformance write FPerformance;
end;
const
DefaultJPEGMimeType = 'image/jpeg';
implementation
{ TJPEGImage }
procedure TJPEGImage.InitFPImageReader(ImgReader: TFPCustomImageReader);
var
JPEGReader: TFPReaderJPEG;
begin
if ImgReader is TFPReaderJPEG then begin
JPEGReader:=TFPReaderJPEG(ImgReader);
JPEGReader.Performance:=Performance;
end;
inherited InitFPImageReader(ImgReader);
end;
procedure TJPEGImage.FinalizeFPImageReader(ImgReader: TFPCustomImageReader);
var
JPEGReader: TFPReaderJPEG;
begin
if ImgReader is TFPReaderJPEG then begin
JPEGReader:=TFPReaderJPEG(ImgReader);
FProgressiveEncoding:=JPEGReader.ProgressiveEncoding;
end;
inherited FinalizeFPImageReader(ImgReader);
end;
procedure TJPEGImage.InitFPImageWriter(ImgWriter: TFPCustomImageWriter);
var
JPEGWriter: TFPWriterJPEG;
begin
if ImgWriter is TFPWriterJPEG then begin
JPEGWriter:=TFPWriterJPEG(ImgWriter);
if JPEGWriter<>nil then ;
JPEGWriter.ProgressiveEncoding:=ProgressiveEncoding;
JPEGWriter.CompressionQuality:=CompressionQuality;
end;
inherited InitFPImageWriter(ImgWriter);
end;
class function TJPEGImage.GetDefaultFPReader: TFPCustomImageReaderClass;
begin
Result:=TFPReaderJPEG;
end;
class function TJPEGImage.GetDefaultFPWriter: TFPCustomImageWriterClass;
begin
Result:=TFPWriterJPEG;
end;
constructor TJPEGImage.Create;
begin
inherited Create;
FPerformance:=jpBestQuality;
FProgressiveEncoding:=false;
FQuality:=75;
end;
class function TJPEGImage.GetFileExtensions: string;
begin
Result:='jpg;jpeg';
end;
end.
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