sw SVG export: try to reuse original bitmap data for JPG and PNG bitmaps

Writer shapes are implemented using SwXShape, Impress shapes use
SdrGrafObj. So switch to working with the XShape interface, which is
supported by both.

Also, don't work with the transformed graphic if it has the same
checksum as the original graphic: the transformed graphic is not linked
to the original JPG/PNG data.

Now selecting an image in Writer Online has the same speedup that
Impress Online already had.

Change-Id: Iab2791c5f5c7a2754e3de0ebb2d6ea664f6c77e4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89542
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

2 files changed, 123 insertions, 0 deletions

diff --git a/filter/qa/unit/data/preserve-jpg.odt b/filter/qa/unit/data/preserve-jpg.odt
new file mode 100644
index 000000000000..83768bd47afb
--- /dev/null
+++ b/filter/qa/unit/data/preserve-jpg.odt
diff --git a/filter/qa/unit/svg.cxx b/filter/qa/unit/svg.cxx
new file mode 100644
index 000000000000..379189b98365
--- /dev/null
+++ b/filter/qa/unit/svg.cxx
@@ -0,0 +1,123 @@
+/* -*- 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/.
+ */
+
+#include <test/bootstrapfixture.hxx>
+#include <unotest/macros_test.hxx>
+#include <test/xmltesttools.hxx>
+
+#include <com/sun/star/drawing/XDrawPagesSupplier.hpp>
+#include <com/sun/star/frame/Desktop.hpp>
+#include <com/sun/star/frame/XStorable.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/frame/DispatchHelper.hpp>
+#include <unotools/streamwrap.hxx>
+#include <unotools/mediadescriptor.hxx>
+#include <tools/stream.hxx>
+#include <comphelper/processfactory.hxx>
+
+using namespace ::com::sun::star;
+
+char const DATA_DIRECTORY[] = "/filter/qa/unit/data/";
+
+namespace
+{
+void dispatchCommand(const uno::Reference<lang::XComponent>& xComponent, const OUString& rCommand,
+                     const uno::Sequence<beans::PropertyValue>& rPropertyValues)
+{
+    uno::Reference<frame::XController> xController
+        = uno::Reference<frame::XModel>(xComponent, uno::UNO_QUERY_THROW)->getCurrentController();
+    CPPUNIT_ASSERT(xController.is());
+    uno::Reference<frame::XDispatchProvider> xFrame(xController->getFrame(), uno::UNO_QUERY);
+    CPPUNIT_ASSERT(xFrame.is());
+
+    uno::Reference<uno::XComponentContext> xContext = ::comphelper::getProcessComponentContext();
+    uno::Reference<frame::XDispatchHelper> xDispatchHelper(frame::DispatchHelper::create(xContext));
+    CPPUNIT_ASSERT(xDispatchHelper.is());
+
+    xDispatchHelper->executeDispatch(xFrame, rCommand, OUString(), 0, rPropertyValues);
+}
+}
+
+/// SVG filter tests.
+class SvgFilterTest : public test::BootstrapFixture, public unotest::MacrosTest, public XmlTestTools
+{
+private:
+    uno::Reference<uno::XComponentContext> mxComponentContext;
+    uno::Reference<lang::XComponent> mxComponent;
+
+public:
+    void setUp() override;
+    void tearDown() override;
+    void registerNamespaces(xmlXPathContextPtr& pXmlXpathCtx) override;
+    uno::Reference<lang::XComponent>& getComponent() { return mxComponent; }
+    void load(const OUString& rURL);
+};
+
+void SvgFilterTest::setUp()
+{
+    test::BootstrapFixture::setUp();
+
+    mxComponentContext.set(comphelper::getComponentContext(getMultiServiceFactory()));
+    mxDesktop.set(frame::Desktop::create(mxComponentContext));
+}
+
+void SvgFilterTest::tearDown()
+{
+    if (mxComponent.is())
+        mxComponent->dispose();
+
+    test::BootstrapFixture::tearDown();
+}
+
+void SvgFilterTest::load(const OUString& rFileName)
+{
+    OUString aURL = m_directories.getURLFromSrc(DATA_DIRECTORY) + rFileName;
+    mxComponent = loadFromDesktop(aURL);
+}
+
+void SvgFilterTest::registerNamespaces(xmlXPathContextPtr& pXmlXpathCtx)
+{
+    xmlXPathRegisterNs(pXmlXpathCtx, BAD_CAST("svg"), BAD_CAST("http://www.w3.org/2000/svg"));
+}
+
+CPPUNIT_TEST_FIXTURE(SvgFilterTest, testPreserveJpg)
+{
+#if !defined(MACOSX)
+    // Load a document with a jpeg image in it.
+    load("preserve-jpg.odt");
+
+    // Select the image.
+    dispatchCommand(getComponent(), ".uno:JumpToNextFrame", {});
+
+    // Export the selection to SVG.
+    uno::Reference<frame::XStorable> xStorable(getComponent(), uno::UNO_QUERY_THROW);
+    SvMemoryStream aStream;
+    uno::Reference<io::XOutputStream> xOut = new utl::OOutputStreamWrapper(aStream);
+    utl::MediaDescriptor aMediaDescriptor;
+    aMediaDescriptor["FilterName"] <<= OUString("writer_svg_Export");
+    aMediaDescriptor["SelectionOnly"] <<= true;
+    aMediaDescriptor["OutputStream"] <<= xOut;
+    xStorable->storeToURL("private:stream", aMediaDescriptor.getAsConstPropertyValueList());
+    aStream.Seek(STREAM_SEEK_TO_BEGIN);
+
+    // Make sure the the original JPG data is reused and we don't perform a PNG re-compress.
+    xmlDocPtr pXmlDoc = parseXmlStream(&aStream);
+    OUString aAttributeValue = getXPath(pXmlDoc, "//svg:image", "href");
+
+    // Without the accompanying fix in place, this test would have failed with:
+    // - Expression: aAttributeValue.startsWith("data:image/jpeg")
+    // i.e. the SVG export result re-compressed the image as PNG, even if the original and the
+    // transformed image is the same, so there is no need for that.
+    CPPUNIT_ASSERT(aAttributeValue.startsWith("data:image/jpeg"));
+#endif
+}
+
+CPPUNIT_PLUGIN_IMPLEMENT();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */