svtools/source/misc/imageresourceaccess.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include <svtools/imageresourceaccess.hxx>
  22
  23 #include <com/sun/star/io/NotConnectedException.hpp>
  24 #include <com/sun/star/io/XSeekable.hpp>
  25 #include <com/sun/star/graphic/GraphicProvider.hpp>
  26 #include <com/sun/star/graphic/XGraphicProvider.hpp>
  27 #include <com/sun/star/io/XStream.hpp>
  28 #include <unotools/ucbstreamhelper.hxx>
  29 #include <tools/stream.hxx>
  30 #include <unotools/streamwrap.hxx>
  31 #include <cppuhelper/implbase2.hxx>
  32 #include <comphelper/processfactory.hxx>
  33
  34 //........................................................................
  35 namespace svt
  36 {
  37 //........................................................................
  38
  39     using namespace ::utl;
  40     using namespace ::com::sun::star::io;
  41     using namespace ::com::sun::star::uno;
  42     using namespace ::com::sun::star::lang;
  43     using namespace ::com::sun::star::beans;
  44     using namespace ::com::sun::star::graphic;
  45
  46     //====================================================================
  47     //= StreamSupplier
  48     //====================================================================
  49     typedef ::cppu::WeakImplHelper2 <   XStream
  50                                     ,   XSeekable
  51                                     >   StreamSupplier_Base;
  52     class StreamSupplier : public StreamSupplier_Base
  53     {
  54     private:
  55         Reference< XInputStream >   m_xInput;
  56         Reference< XOutputStream >  m_xOutput;
  57         Reference< XSeekable >      m_xSeekable;
  58
  59     public:
  60         StreamSupplier( const Reference< XInputStream >& _rxInput, const Reference< XOutputStream >& _rxOutput );
  61
  62     protected:
  63         // XStream
  64         virtual Reference< XInputStream > SAL_CALL getInputStream(  ) throw (RuntimeException);
  65         virtual Reference< XOutputStream > SAL_CALL getOutputStream(  ) throw (RuntimeException);
  66
  67         // XSeekable
  68         virtual void SAL_CALL seek( ::sal_Int64 location ) throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException);
  69         virtual ::sal_Int64 SAL_CALL getPosition(  ) throw (::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException);
  70         virtual ::sal_Int64 SAL_CALL getLength(  ) throw (::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException);
  71     };
  72
  73     //--------------------------------------------------------------------
  74     StreamSupplier::StreamSupplier( const Reference< XInputStream >& _rxInput, const Reference< XOutputStream >& _rxOutput )
  75         :m_xInput( _rxInput )
  76         ,m_xOutput( _rxOutput )
  77     {
  78         m_xSeekable = m_xSeekable.query( m_xInput );
  79         if ( !m_xSeekable.is() )
  80             m_xSeekable = m_xSeekable.query( m_xOutput );
  81         OSL_ENSURE( m_xSeekable.is(), "StreamSupplier::StreamSupplier: at least one of both must be seekable!" );
  82     }
  83
  84     //--------------------------------------------------------------------
  85     Reference< XInputStream > SAL_CALL StreamSupplier::getInputStream(  ) throw (RuntimeException)
  86     {
  87         return m_xInput;
  88     }
  89
  90     //--------------------------------------------------------------------
  91     Reference< XOutputStream > SAL_CALL StreamSupplier::getOutputStream(  ) throw (RuntimeException)
  92     {
  93         return m_xOutput;
  94     }
  95
  96     //--------------------------------------------------------------------
  97     void SAL_CALL StreamSupplier::seek( ::sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException)
  98     {
  99         if ( !m_xSeekable.is() )
 100             throw NotConnectedException();
 101
 102         m_xSeekable->seek( location );
 103     }
 104
 105     //--------------------------------------------------------------------
 106     ::sal_Int64 SAL_CALL StreamSupplier::getPosition(  ) throw (IOException, RuntimeException)
 107     {
 108         if ( !m_xSeekable.is() )
 109             throw NotConnectedException();
 110
 111         return m_xSeekable->getPosition();
 112     }
 113
 114     //--------------------------------------------------------------------
 115     ::sal_Int64 SAL_CALL StreamSupplier::getLength(  ) throw (IOException, RuntimeException)
 116     {
 117         if ( !m_xSeekable.is() )
 118             throw NotConnectedException();
 119
 120         return m_xSeekable->getLength();
 121     }
 122
 123     //====================================================================
 124     //= GraphicAccess
 125     //====================================================================
 126     //--------------------------------------------------------------------
 127     bool GraphicAccess::isSupportedURL( const OUString& _rURL )
 128     {
 129         if  (   ( _rURL.indexOfAsciiL( RTL_CONSTASCII_STRINGPARAM( "private:resource/" ) ) == 0 )
 130             ||  ( _rURL.indexOfAsciiL( RTL_CONSTASCII_STRINGPARAM( "private:graphicrepository/" ) ) == 0 )
 131             ||  ( _rURL.indexOfAsciiL( RTL_CONSTASCII_STRINGPARAM( "private:standardimage/" ) ) == 0 )
 132             ||  ( _rURL.indexOfAsciiL( RTL_CONSTASCII_STRINGPARAM( "vnd.sun.star.GraphicObject:" ) ) == 0 )
 133             ||  ( _rURL.indexOfAsciiL( RTL_CONSTASCII_STRINGPARAM( "vnd.sun.star.extension://" ) ) == 0 )
 134             )
 135             return true;
 136         return false;
 137     }
 138
 139     //--------------------------------------------------------------------
 140     SvStream* GraphicAccess::getImageStream( const Reference< XComponentContext >& _rxContext, const OUString& _rImageResourceURL )
 141     {
 142         SvStream* pReturn = NULL;
 143
 144         try
 145         {
 146             // get a GraphicProvider
 147             Reference< XGraphicProvider > xProvider = ::com::sun::star::graphic::GraphicProvider::create(_rxContext);
 148
 149             // let it create a graphic from the given URL
 150             Sequence< PropertyValue > aMediaProperties( 1 );
 151             aMediaProperties[0].Name = OUString( "URL" );
 152             aMediaProperties[0].Value <<= _rImageResourceURL;
 153             Reference< XGraphic > xGraphic( xProvider->queryGraphic( aMediaProperties ) );
 154             OSL_ENSURE( xGraphic.is(), "GraphicAccess::getImageStream: the provider did not give us a graphic object!" );
 155             if ( !xGraphic.is() )
 156                 return pReturn;
 157
 158             // copy the graphic to a in-memory buffer
 159             SvMemoryStream* pMemBuffer = new SvMemoryStream;
 160             Reference< XStream > xBufferAccess = new StreamSupplier(
 161                 new OSeekableInputStreamWrapper( *pMemBuffer ),
 162                 new OSeekableOutputStreamWrapper( *pMemBuffer )
 163             );
 164
 165             aMediaProperties.realloc( 2 );
 166             aMediaProperties[0].Name = OUString( "OutputStream" );
 167             aMediaProperties[0].Value <<= xBufferAccess;
 168             aMediaProperties[1].Name = OUString( "MimeType" );
 169             aMediaProperties[1].Value <<= OUString( "image/png" );
 170             xProvider->storeGraphic( xGraphic, aMediaProperties );
 171
 172             pMemBuffer->Seek( 0 );
 173             pReturn = pMemBuffer;
 174         }
 175         catch( const Exception& )
 176         {
 177             OSL_FAIL( "GraphicAccess::getImageStream: caught an exception!" );
 178         }
 179
 180         return pReturn;
 181     }
 182
 183     //--------------------------------------------------------------------
 184     Reference< XInputStream > GraphicAccess::getImageXStream( const Reference< XComponentContext >& _rxContext, const OUString& _rImageResourceURL )
 185     {
 186         return new OSeekableInputStreamWrapper( getImageStream( _rxContext, _rImageResourceURL ), sal_True );   // take ownership
 187     }
 188
 189 //........................................................................
 190 } // namespace svt
 191 //........................................................................
 192
 193 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */