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: */