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 <osl/diagnose.h>
  29 #include <unotools/ucbstreamhelper.hxx>
  30 #include <tools/stream.hxx>
  31 #include <unotools/streamwrap.hxx>
  32 #include <cppuhelper/implbase2.hxx>
  33 #include <comphelper/processfactory.hxx>
  34
  35
  36 namespace svt
  37 {
  38
  39
  40     using namespace ::utl;
  41     using namespace ::com::sun::star::io;
  42     using namespace ::com::sun::star::uno;
  43     using namespace ::com::sun::star::lang;
  44     using namespace ::com::sun::star::beans;
  45     using namespace ::com::sun::star::graphic;
  46
  47
  48     //= StreamSupplier
  49
  50     typedef ::cppu::WeakImplHelper2 <   XStream
  51                                     ,   XSeekable
  52                                     >   StreamSupplier_Base;
  53     class StreamSupplier : public StreamSupplier_Base
  54     {
  55     private:
  56         Reference< XInputStream >   m_xInput;
  57         Reference< XOutputStream >  m_xOutput;
  58         Reference< XSeekable >      m_xSeekable;
  59
  60     public:
  61         StreamSupplier( const Reference< XInputStream >& _rxInput, const Reference< XOutputStream >& _rxOutput );
  62
  63     protected:
  64         // XStream
  65         virtual Reference< XInputStream > SAL_CALL getInputStream(  ) throw (RuntimeException, std::exception) SAL_OVERRIDE;
  66         virtual Reference< XOutputStream > SAL_CALL getOutputStream(  ) throw (RuntimeException, std::exception) SAL_OVERRIDE;
  67
  68         // XSeekable
  69         virtual void SAL_CALL seek( ::sal_Int64 location ) throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException, std::exception) SAL_OVERRIDE;
  70         virtual ::sal_Int64 SAL_CALL getPosition(  ) throw (::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException, std::exception) SAL_OVERRIDE;
  71         virtual ::sal_Int64 SAL_CALL getLength(  ) throw (::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException, std::exception) SAL_OVERRIDE;
  72     };
  73
  74
  75     StreamSupplier::StreamSupplier( const Reference< XInputStream >& _rxInput, const Reference< XOutputStream >& _rxOutput )
  76         :m_xInput( _rxInput )
  77         ,m_xOutput( _rxOutput )
  78     {
  79         m_xSeekable.set(m_xInput, css::uno::UNO_QUERY);
  80         if ( !m_xSeekable.is() )
  81             m_xSeekable.set(m_xOutput, css::uno::UNO_QUERY);
  82         OSL_ENSURE( m_xSeekable.is(), "StreamSupplier::StreamSupplier: at least one of both must be seekable!" );
  83     }
  84
  85
  86     Reference< XInputStream > SAL_CALL StreamSupplier::getInputStream(  ) throw (RuntimeException, std::exception)
  87     {
  88         return m_xInput;
  89     }
  90
  91
  92     Reference< XOutputStream > SAL_CALL StreamSupplier::getOutputStream(  ) throw (RuntimeException, std::exception)
  93     {
  94         return m_xOutput;
  95     }
  96
  97
  98     void SAL_CALL StreamSupplier::seek( ::sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException, std::exception)
  99     {
 100         if ( !m_xSeekable.is() )
 101             throw NotConnectedException();
 102
 103         m_xSeekable->seek( location );
 104     }
 105
 106
 107     ::sal_Int64 SAL_CALL StreamSupplier::getPosition(  ) throw (IOException, RuntimeException, std::exception)
 108     {
 109         if ( !m_xSeekable.is() )
 110             throw NotConnectedException();
 111
 112         return m_xSeekable->getPosition();
 113     }
 114
 115
 116     ::sal_Int64 SAL_CALL StreamSupplier::getLength(  ) throw (IOException, RuntimeException, std::exception)
 117     {
 118         if ( !m_xSeekable.is() )
 119             throw NotConnectedException();
 120
 121         return m_xSeekable->getLength();
 122     }
 123
 124
 125     //= GraphicAccess
 126
 127
 128     bool GraphicAccess::isSupportedURL( const OUString& _rURL )
 129     {
 130         if  (  _rURL.startsWith( "private:resource/" )
 131             || _rURL.startsWith( "private:graphicrepository/" )
 132             || _rURL.startsWith( "private:standardimage/" )
 133             || _rURL.startsWith( "vnd.sun.star.GraphicObject:" )
 134             || _rURL.startsWith( "vnd.sun.star.extension://" )
 135             )
 136             return true;
 137         return false;
 138     }
 139
 140
 141     SvStream* GraphicAccess::getImageStream( const Reference< XComponentContext >& _rxContext, const OUString& _rImageResourceURL )
 142     {
 143         SvStream* pReturn = NULL;
 144
 145         try
 146         {
 147             // get a GraphicProvider
 148             Reference< XGraphicProvider > xProvider = ::com::sun::star::graphic::GraphicProvider::create(_rxContext);
 149
 150             // let it create a graphic from the given URL
 151             Sequence< PropertyValue > aMediaProperties( 1 );
 152             aMediaProperties[0].Name = "URL";
 153             aMediaProperties[0].Value <<= _rImageResourceURL;
 154             Reference< XGraphic > xGraphic( xProvider->queryGraphic( aMediaProperties ) );
 155             OSL_ENSURE( xGraphic.is(), "GraphicAccess::getImageStream: the provider did not give us a graphic object!" );
 156             if ( !xGraphic.is() )
 157                 return pReturn;
 158
 159             // copy the graphic to a in-memory buffer
 160             SvMemoryStream* pMemBuffer = new SvMemoryStream;
 161             Reference< XStream > xBufferAccess = new StreamSupplier(
 162                 new OSeekableInputStreamWrapper( *pMemBuffer ),
 163                 new OSeekableOutputStreamWrapper( *pMemBuffer )
 164             );
 165
 166             aMediaProperties.realloc( 2 );
 167             aMediaProperties[0].Name = "OutputStream";
 168             aMediaProperties[0].Value <<= xBufferAccess;
 169             aMediaProperties[1].Name = "MimeType";
 170             aMediaProperties[1].Value <<= OUString( "image/png" );
 171             xProvider->storeGraphic( xGraphic, aMediaProperties );
 172
 173             pMemBuffer->Seek( 0 );
 174             pReturn = pMemBuffer;
 175         }
 176         catch( const Exception& )
 177         {
 178             OSL_FAIL( "GraphicAccess::getImageStream: caught an exception!" );
 179         }
 180
 181         return pReturn;
 182     }
 183
 184
 185     Reference< XInputStream > GraphicAccess::getImageXStream( const Reference< XComponentContext >& _rxContext, const OUString& _rImageResourceURL )
 186     {
 187         return new OSeekableInputStreamWrapper( getImageStream( _rxContext, _rImageResourceURL ), true );   // take ownership
 188     }
 189
 190
 191 } // namespace svt
 192
 193
 194 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */