diff options
Diffstat (limited to 'svtools/source/misc/imageresourceaccess.cxx')
| -rw-r--r-- | svtools/source/misc/imageresourceaccess.cxx | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/svtools/source/misc/imageresourceaccess.cxx b/svtools/source/misc/imageresourceaccess.cxx new file mode 100644 index 000000000..66c458c91 --- /dev/null +++ b/svtools/source/misc/imageresourceaccess.cxx @@ -0,0 +1,166 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + + +#include <svtools/imageresourceaccess.hxx> + +#include <com/sun/star/io/NotConnectedException.hpp> +#include <com/sun/star/io/XSeekable.hpp> +#include <com/sun/star/graphic/GraphicProvider.hpp> +#include <com/sun/star/graphic/XGraphicProvider.hpp> +#include <com/sun/star/io/XStream.hpp> + +#include <comphelper/propertyvalue.hxx> +#include <o3tl/string_view.hxx> +#include <osl/diagnose.h> +#include <tools/stream.hxx> +#include <tools/diagnose_ex.h> +#include <unotools/streamwrap.hxx> +#include <cppuhelper/implbase.hxx> + +namespace svt::GraphicAccess +{ + +using namespace ::utl; +using namespace css; + +typedef ::cppu::WeakImplHelper<io::XStream, io::XSeekable> StreamSupplier_Base; + +namespace { + +class StreamSupplier : public StreamSupplier_Base +{ +private: + uno::Reference<io::XInputStream> m_xInput; + uno::Reference<io::XOutputStream> m_xOutput; + uno::Reference<io::XSeekable> m_xSeekable; + +public: + StreamSupplier(uno::Reference<io::XInputStream> const & rxInput, uno::Reference<io::XOutputStream> const & rxOutput); + +protected: + // XStream + virtual uno::Reference<io::XInputStream> SAL_CALL getInputStream() override; + virtual uno::Reference<io::XOutputStream> SAL_CALL getOutputStream() override; + + // XSeekable + virtual void SAL_CALL seek(sal_Int64 location) override; + virtual sal_Int64 SAL_CALL getPosition() override; + virtual sal_Int64 SAL_CALL getLength() override; +}; + +} + +StreamSupplier::StreamSupplier(uno::Reference<io::XInputStream> const & rxInput, uno::Reference<io::XOutputStream> const & rxOutput) + : m_xInput(rxInput) + , m_xOutput(rxOutput) +{ + m_xSeekable.set(m_xInput, uno::UNO_QUERY); + if (!m_xSeekable.is()) + m_xSeekable.set(m_xOutput, uno::UNO_QUERY); + OSL_ENSURE(m_xSeekable.is(), "StreamSupplier::StreamSupplier: at least one of both must be seekable!"); +} + +uno::Reference<io::XInputStream> SAL_CALL StreamSupplier::getInputStream() +{ + return m_xInput; +} + +uno::Reference<io::XOutputStream> SAL_CALL StreamSupplier::getOutputStream() +{ + return m_xOutput; +} + +void SAL_CALL StreamSupplier::seek(sal_Int64 nLocation) +{ + if (!m_xSeekable.is()) + throw io::NotConnectedException(); + m_xSeekable->seek(nLocation); +} + +sal_Int64 SAL_CALL StreamSupplier::getPosition() +{ + if (!m_xSeekable.is()) + throw io::NotConnectedException(); + return m_xSeekable->getPosition(); +} + +sal_Int64 SAL_CALL StreamSupplier::getLength() +{ + if (!m_xSeekable.is()) + throw io::NotConnectedException(); + + return m_xSeekable->getLength(); +} + +bool isSupportedURL(std::u16string_view rURL) +{ + return o3tl::starts_with(rURL, u"private:resource/") + || o3tl::starts_with(rURL, u"private:graphicrepository/") + || o3tl::starts_with(rURL, u"private:standardimage/") + || o3tl::starts_with(rURL, u"vnd.sun.star.extension://"); +} + +std::unique_ptr<SvStream> getImageStream(uno::Reference<uno::XComponentContext> const & rxContext, OUString const & rImageResourceURL) +{ + std::unique_ptr<SvMemoryStream> pMemBuffer; + + try + { + // get a GraphicProvider + uno::Reference<graphic::XGraphicProvider> xProvider = css::graphic::GraphicProvider::create(rxContext); + + // let it create a graphic from the given URL + uno::Sequence<beans::PropertyValue> aMediaProperties{ comphelper::makePropertyValue( + "URL", rImageResourceURL) }; + uno::Reference<graphic::XGraphic> xGraphic(xProvider->queryGraphic(aMediaProperties)); + + OSL_ENSURE(xGraphic.is(), "GraphicAccess::getImageStream: the provider did not give us a graphic object!"); + if (!xGraphic.is()) + return pMemBuffer; + + // copy the graphic to an in-memory buffer + pMemBuffer.reset(new SvMemoryStream); + uno::Reference<io::XStream> xBufferAccess = new StreamSupplier( + new OSeekableInputStreamWrapper(*pMemBuffer), + new OSeekableOutputStreamWrapper(*pMemBuffer)); + + aMediaProperties = { comphelper::makePropertyValue("OutputStream", xBufferAccess), + comphelper::makePropertyValue("MimeType", OUString("image/png")) }; + xProvider->storeGraphic(xGraphic, aMediaProperties); + + pMemBuffer->Seek(0); + } + catch (const uno::Exception&) + { + TOOLS_WARN_EXCEPTION("svtools", "GraphicAccess::getImageStream"); + pMemBuffer.reset(); + } + + return pMemBuffer; +} + +uno::Reference<io::XInputStream> getImageXStream(uno::Reference<uno::XComponentContext> const & rxContext, OUString const & rImageResourceURL) +{ + return new OSeekableInputStreamWrapper(getImageStream(rxContext, rImageResourceURL).release(), true); // take ownership +} + +} // namespace svt::GraphicAccess + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |