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/* -*- 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 <comphelper/diagnose_ex.hxx>
#include <unotools/streamwrap.hxx>
#include <cppuhelper/implbase.hxx>
#include <utility>
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> xInput, uno::Reference<io::XOutputStream> xOutput);
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> xInput, uno::Reference<io::XOutputStream> xOutput)
: m_xInput(std::move(xInput))
, m_xOutput(std::move(xOutput))
{
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: */
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