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