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129 lines
3.6 KiB
ObjectPascal
129 lines
3.6 KiB
ObjectPascal
{ Copyright (C) 2003 Mattias Gaertner
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This library is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
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for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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}
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unit LazJPEG;
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{$mode objfpc}{$H+}
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interface
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uses
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SysUtils, Classes, FPImage, IntfGraphics, Graphics, FPReadJPEG, FPWriteJPEG,
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ClipBrd;
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type
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TJPEGQualityRange = TFPJPEGCompressionQuality;
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TJPEGPerformance = TJPEGReadPerformance;
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TJPEGImage = class(TFPImageBitmap)
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private
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FPerformance: TJPEGPerformance;
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FProgressiveEncoding: boolean;
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FQuality: TJPEGQualityRange;
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protected
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procedure InitFPImageReader(ImgReader: TFPCustomImageReader); override;
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procedure FinalizeFPImageReader(ImgReader: TFPCustomImageReader); override;
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procedure InitFPImageWriter(ImgWriter: TFPCustomImageWriter); override;
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public
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constructor Create; override;
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class function GetFileExtensions: string; override;
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class function GetDefaultFPReader: TFPCustomImageReaderClass; override;
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class function GetDefaultFPWriter: TFPCustomImageWriterClass; override;
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public
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property CompressionQuality: TJPEGQualityRange read FQuality write FQuality;
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property ProgressiveEncoding: boolean read FProgressiveEncoding;
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property Performance: TJPEGPerformance read FPerformance write FPerformance;
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end;
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const
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DefaultJPEGMimeType = 'image/jpeg';
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implementation
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{ TJPEGImage }
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procedure TJPEGImage.InitFPImageReader(ImgReader: TFPCustomImageReader);
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var
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JPEGReader: TFPReaderJPEG;
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begin
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if ImgReader is TFPReaderJPEG then begin
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JPEGReader:=TFPReaderJPEG(ImgReader);
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JPEGReader.Performance:=Performance;
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end;
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inherited InitFPImageReader(ImgReader);
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end;
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procedure TJPEGImage.FinalizeFPImageReader(ImgReader: TFPCustomImageReader);
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var
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JPEGReader: TFPReaderJPEG;
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begin
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if ImgReader is TFPReaderJPEG then begin
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JPEGReader:=TFPReaderJPEG(ImgReader);
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FProgressiveEncoding:=JPEGReader.ProgressiveEncoding;
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end;
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inherited FinalizeFPImageReader(ImgReader);
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end;
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procedure TJPEGImage.InitFPImageWriter(ImgWriter: TFPCustomImageWriter);
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var
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JPEGWriter: TFPWriterJPEG;
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begin
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if ImgWriter is TFPWriterJPEG then begin
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JPEGWriter:=TFPWriterJPEG(ImgWriter);
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if JPEGWriter<>nil then ;
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JPEGWriter.ProgressiveEncoding:=ProgressiveEncoding;
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JPEGWriter.CompressionQuality:=CompressionQuality;
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end;
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inherited InitFPImageWriter(ImgWriter);
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end;
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function TJPEGImage.GetDefaultFPReader: TFPCustomImageReaderClass;
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begin
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Result:=TFPReaderJPEG;
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end;
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function TJPEGImage.GetDefaultFPWriter: TFPCustomImageWriterClass;
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begin
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Result:=TFPWriterJPEG;
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end;
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constructor TJPEGImage.Create;
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begin
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inherited Create;
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FPerformance:=jpBestQuality;
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FProgressiveEncoding:=false;
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FQuality:=75;
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end;
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function TJPEGImage.GetFileExtensions: string;
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begin
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Result:='jpg;jpeg';
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end;
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initialization
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TPicture.RegisterFileFormat('jpg', 'JPEG Image File', TJPEGImage);
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TPicture.RegisterFileFormat('jpeg', 'JPEG Image File', TJPEGImage);
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TPicture.RegisterClipboardFormat(RegisterClipboardFormat(DefaultJPEGMimeType),
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TJPEGImage);
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finalization
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TPicture.UnregisterGraphicClass(TJPEGImage);
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end.
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