svtools/source/misc/imageresourceaccess.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_svtools.hxx"
  33
  34 #ifndef SVTOOLS_SOURCE_MISC_IMAGERESOURCEACCESS_HXX
  35 #include "imageresourceaccess.hxx"
  36 #endif
  37
  38 /** === begin UNO includes === **/
  39 #include <com/sun/star/io/NotConnectedException.hpp>
  40 #include <com/sun/star/io/XSeekable.hpp>
  41 #include <com/sun/star/graphic/XGraphicProvider.hpp>
  42 #include <com/sun/star/io/XStream.hpp>
  43 /** === end UNO includes === **/
  44 #include <unotools/ucbstreamhelper.hxx>
  45 #include <tools/stream.hxx>
  46 #include <unotools/streamwrap.hxx>
  47 #include <cppuhelper/implbase2.hxx>
  48
  49 //........................................................................
  50 namespace svt
  51 {
  52 //........................................................................
  53
  54 #define GRAPHOBJ_URLPREFIX "vnd.sun.star.GraphicObject:"
  55
  56     using namespace ::utl;
  57     using namespace ::comphelper;
  58     using namespace ::com::sun::star::io;
  59     using namespace ::com::sun::star::uno;
  60     using namespace ::com::sun::star::lang;
  61     using namespace ::com::sun::star::beans;
  62     using namespace ::com::sun::star::graphic;
  63
  64     //====================================================================
  65     //= StreamSupplier
  66     //====================================================================
  67     typedef ::cppu::WeakImplHelper2 <   XStream
  68                                     ,   XSeekable
  69                                     >   StreamSupplier_Base;
  70     class StreamSupplier : public StreamSupplier_Base
  71     {
  72     private:
  73         Reference< XInputStream >   m_xInput;
  74         Reference< XOutputStream >  m_xOutput;
  75         Reference< XSeekable >      m_xSeekable;
  76
  77     public:
  78         StreamSupplier( const Reference< XInputStream >& _rxInput, const Reference< XOutputStream >& _rxOutput );
  79
  80     protected:
  81         // XStream
  82         virtual Reference< XInputStream > SAL_CALL getInputStream(  ) throw (RuntimeException);
  83         virtual Reference< XOutputStream > SAL_CALL getOutputStream(  ) throw (RuntimeException);
  84
  85         // XSeekable
  86         virtual void SAL_CALL seek( ::sal_Int64 location ) throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException);
  87         virtual ::sal_Int64 SAL_CALL getPosition(  ) throw (::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException);
  88         virtual ::sal_Int64 SAL_CALL getLength(  ) throw (::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException);
  89     };
  90
  91     //--------------------------------------------------------------------
  92     StreamSupplier::StreamSupplier( const Reference< XInputStream >& _rxInput, const Reference< XOutputStream >& _rxOutput )
  93         :m_xInput( _rxInput )
  94         ,m_xOutput( _rxOutput )
  95     {
  96         m_xSeekable = m_xSeekable.query( m_xInput );
  97         if ( !m_xSeekable.is() )
  98             m_xSeekable = m_xSeekable.query( m_xOutput );
  99         OSL_ENSURE( m_xSeekable.is(), "StreamSupplier::StreamSupplier: at least one of both must be seekable!" );
 100     }
 101
 102     //--------------------------------------------------------------------
 103     Reference< XInputStream > SAL_CALL StreamSupplier::getInputStream(  ) throw (RuntimeException)
 104     {
 105         return m_xInput;
 106     }
 107
 108     //--------------------------------------------------------------------
 109     Reference< XOutputStream > SAL_CALL StreamSupplier::getOutputStream(  ) throw (RuntimeException)
 110     {
 111         return m_xOutput;
 112     }
 113
 114     //--------------------------------------------------------------------
 115     void SAL_CALL StreamSupplier::seek( ::sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException)
 116     {
 117         if ( !m_xSeekable.is() )
 118             throw NotConnectedException();
 119
 120         m_xSeekable->seek( location );
 121     }
 122
 123     //--------------------------------------------------------------------
 124     ::sal_Int64 SAL_CALL StreamSupplier::getPosition(  ) throw (IOException, RuntimeException)
 125     {
 126         if ( !m_xSeekable.is() )
 127             throw NotConnectedException();
 128
 129         return m_xSeekable->getPosition();
 130     }
 131
 132     //--------------------------------------------------------------------
 133     ::sal_Int64 SAL_CALL StreamSupplier::getLength(  ) throw (IOException, RuntimeException)
 134     {
 135         if ( !m_xSeekable.is() )
 136             throw NotConnectedException();
 137
 138         return m_xSeekable->getLength();
 139     }
 140
 141     //====================================================================
 142     //= GraphicAccess
 143     //====================================================================
 144     //--------------------------------------------------------------------
 145     bool GraphicAccess::isSupportedURL( const ::rtl::OUString& _rURL )
 146     {
 147         ::rtl::OUString sIndicator( RTL_CONSTASCII_USTRINGPARAM( "private:resource/" ) );
 148         return ( ( _rURL.indexOf( sIndicator ) == 0 ) || ( _rURL.compareToAscii( GRAPHOBJ_URLPREFIX, RTL_CONSTASCII_LENGTH( GRAPHOBJ_URLPREFIX ) ) == 0 ) );
 149     }
 150
 151     //--------------------------------------------------------------------
 152     SvStream* GraphicAccess::getImageStream( const Reference< XMultiServiceFactory >& _rxORB, const ::rtl::OUString& _rImageResourceURL )
 153     {
 154         SvStream* pReturn = NULL;
 155
 156         try
 157         {
 158             // get a GraphicProvider
 159             Reference< XGraphicProvider > xProvider;
 160             if ( _rxORB.is() )
 161                 xProvider = xProvider.query( _rxORB->createInstance( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "com.sun.star.graphic.GraphicProvider" ) ) ) );
 162             OSL_ENSURE( xProvider.is(), "GraphicAccess::getImageStream: could not create a graphic provider!" );
 163
 164             if ( !xProvider.is() )
 165                 return pReturn;
 166
 167             // let it create a graphic from the given URL
 168             Sequence< PropertyValue > aMediaProperties( 1 );
 169             aMediaProperties[0].Name = ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "URL" ) );
 170             aMediaProperties[0].Value <<= _rImageResourceURL;
 171             Reference< XGraphic > xGraphic( xProvider->queryGraphic( aMediaProperties ) );
 172             OSL_ENSURE( xGraphic.is(), "GraphicAccess::getImageStream: the provider did not give us a graphic object!" );
 173             if ( !xGraphic.is() )
 174                 return pReturn;
 175
 176             // copy the graphic to a in-memory buffer
 177             SvMemoryStream* pMemBuffer = new SvMemoryStream;
 178             Reference< XStream > xBufferAccess = new StreamSupplier(
 179                 new OSeekableInputStreamWrapper( *pMemBuffer ),
 180                 new OSeekableOutputStreamWrapper( *pMemBuffer )
 181             );
 182
 183             aMediaProperties.realloc( 2 );
 184             aMediaProperties[0].Name = ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "OutputStream" ) );
 185             aMediaProperties[0].Value <<= xBufferAccess;
 186             aMediaProperties[1].Name = ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "MimeType" ) );
 187             aMediaProperties[1].Value <<= ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "image/png" ) );
 188             xProvider->storeGraphic( xGraphic, aMediaProperties );
 189
 190             pMemBuffer->Seek( 0 );
 191             pReturn = pMemBuffer;
 192         }
 193         catch( const Exception& )
 194         {
 195             OSL_ENSURE( sal_False, "GraphicAccess::getImageStream: caught an exception!" );
 196         }
 197
 198         return pReturn;
 199     }
 200
 201     //--------------------------------------------------------------------
 202     Reference< XInputStream > GraphicAccess::getImageXStream( const Reference< XMultiServiceFactory >& _rxORB, const ::rtl::OUString& _rImageResourceURL )
 203     {
 204         return new OSeekableInputStreamWrapper( getImageStream( _rxORB, _rImageResourceURL ), sal_True );   // take ownership
 205     }
 206
 207 //........................................................................
 208 } // namespace svt
 209 //........................................................................
 210