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PdfJpegImage.pas
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Pascal/Delphi Source File
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2001-09-15
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2KB
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76 lines
{*
* << P o w e r P d f >> -- PdfJpegImage.pas
*
* Copyright (c) 1999-2001 Takezou. <takeshi_kanno@est.hi-ho.ne.jp>
*
* 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 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 Library general Public License for more
* details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library.
*
* 2001.06.14 create
* 2001.09.07 changes the implementation of TPdfImageCreator.
*
*}
unit PdfJpegImage;
interface
uses
SysUtils, Classes, Graphics, PdfTypes, PdfDoc, PdfImages, JPEG;
type
{ TPdfJpegImage }
TPdfJpegImage = class(TPdfImageCreator)
public
function CreateImage(AImage: TGraphic): TPdfImage; override;
end;
implementation
// CreateImage
function TPdfJpegImage.CreateImage(AImage: TGraphic): TPdfImage;
begin
// check whether specified graphic is valid image.
if not (AImage is TJpegImage) then
raise EPdfInvalidValue.Create('only jpeg image is allowed.');
result := TPdfImage.CreateStream(nil);
with result do
try
TJpegImage(AImage).SaveToStream(Stream);
with Attributes do
begin
AddItem('Type', TPdfName.CreateName('XObject'));
AddItem('Subtype', TPdfName.CreateName('Image'));
AddItem('ColorSpace', TPdfName.CreateName('DeviceRGB'));
AddItem('Width', TPdfNumber.CreateNumber(AImage.Width));
AddItem('Height', TPdfNumber.CreateNumber(AImage.Height));
AddItem('BitsPerComponent', TPdfNumber.CreateNumber(8));
PdfArrayByName('Filter').AddItem(TPdfName.CreateName('DCTDecode'));
end;
except
result.Free;
raise;
end;
end;
initialization
RegisterClassAlias(TPdfJpegImage, 'Pdf-Jpeg');
finalization
UnRegisterClass(TPdfJpegImage);
end.