Remove duplicate code for reading thumbnails

Change-Id: I51de8d07a4dc51ba03d24a1a5805df051b6e09b4
Reviewed-on: https://gerrit.libreoffice.org/4779
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Tested-by: Petr Mladek <pmladek@suse.cz>

2 files changed, 104 insertions, 97 deletions

diff --git a/sfx2/source/control/templateabstractview.cxx b/sfx2/source/control/templateabstractview.cxx
index ae9a343754d9..cd6e77fd0521 100644
--- a/sfx2/source/control/templateabstractview.cxx
+++ b/sfx2/source/control/templateabstractview.cxx
@@ -285,103 +285,7 @@ BitmapEx TemplateAbstractView::getDefaultThumbnail( const OUString& rPath )
 
 BitmapEx TemplateAbstractView::fetchThumbnail (const OUString &msURL, long width, long height)
 {
-    using namespace ::com::sun::star;
-    using namespace ::com::sun::star::uno;
-
-    // Load the thumbnail from a template document.
-    uno::Reference<io::XInputStream> xIStream;
-
-    uno::Reference< uno::XComponentContext > xContext (comphelper::getProcessComponentContext());
-
-    try
-    {
-        uno::Reference<lang::XSingleServiceFactory> xStorageFactory = embed::StorageFactory::create( xContext );
-
-        uno::Sequence<uno::Any> aArgs (2);
-        aArgs[0] <<= msURL;
-        aArgs[1] <<= embed::ElementModes::READ;
-        uno::Reference<embed::XStorage> xDocStorage (
-            xStorageFactory->createInstanceWithArguments(aArgs),
-            uno::UNO_QUERY);
-
-        try
-        {
-            if (xDocStorage.is())
-            {
-                uno::Reference<embed::XStorage> xStorage (
-                    xDocStorage->openStorageElement(
-                        "Thumbnails",
-                        embed::ElementModes::READ));
-                if (xStorage.is())
-                {
-                    uno::Reference<io::XStream> xThumbnailCopy (
-                        xStorage->cloneStreamElement("thumbnail.png"));
-                    if (xThumbnailCopy.is())
-                        xIStream = xThumbnailCopy->getInputStream();
-                }
-            }
-        }
-        catch (const uno::Exception& rException)
-        {
-            OSL_TRACE (
-                "caught exception while trying to access Thumbnail/thumbnail.png of %s: %s",
-                OUStringToOString(msURL,
-                    RTL_TEXTENCODING_UTF8).getStr(),
-                OUStringToOString(rException.Message,
-                    RTL_TEXTENCODING_UTF8).getStr());
-        }
-
-        try
-        {
-            // An (older) implementation had a bug - The storage
-            // name was "Thumbnail" instead of "Thumbnails".  The
-            // old name is still used as fallback but this code can
-            // be removed soon.
-            if ( ! xIStream.is())
-            {
-                uno::Reference<embed::XStorage> xStorage (
-                    xDocStorage->openStorageElement( "Thumbnail",
-                        embed::ElementModes::READ));
-                if (xStorage.is())
-                {
-                    uno::Reference<io::XStream> xThumbnailCopy (
-                        xStorage->cloneStreamElement("thumbnail.png"));
-                    if (xThumbnailCopy.is())
-                        xIStream = xThumbnailCopy->getInputStream();
-                }
-            }
-        }
-        catch (const uno::Exception& rException)
-        {
-            OSL_TRACE (
-                "caught exception while trying to access Thumbnails/thumbnail.png of %s: %s",
-                OUStringToOString(msURL,
-                    RTL_TEXTENCODING_UTF8).getStr(),
-                OUStringToOString(rException.Message,
-                    RTL_TEXTENCODING_UTF8).getStr());
-        }
-    }
-    catch (const uno::Exception& rException)
-    {
-        OSL_TRACE (
-            "caught exception while trying to access tuhmbnail of %s: %s",
-            OUStringToOString(msURL,
-                RTL_TEXTENCODING_UTF8).getStr(),
-            OUStringToOString(rException.Message,
-                RTL_TEXTENCODING_UTF8).getStr());
-    }
-
-    // Extract the image from the stream.
-    BitmapEx aThumbnail;
-    if (xIStream.is())
-    {
-        ::std::auto_ptr<SvStream> pStream (
-            ::utl::UcbStreamHelper::CreateStream (xIStream));
-        ::vcl::PNGReader aReader (*pStream);
-        aThumbnail = aReader.Read ();
-    }
-
-    return TemplateAbstractView::scaleImg(aThumbnail,width,height);
+    return TemplateAbstractView::scaleImg(ThumbnailView::readThumbnail(msURL), width, height);
 }
 
 IMPL_LINK_NOARG(TemplateAbstractView, ShowRootRegionHdl)
diff --git a/sfx2/source/control/thumbnailview.cxx b/sfx2/source/control/thumbnailview.cxx
index cfefc1f62d51..872299c5b242 100644
--- a/sfx2/source/control/thumbnailview.cxx
+++ b/sfx2/source/control/thumbnailview.cxx
@@ -1285,6 +1285,109 @@ bool ThumbnailView::renameItem(ThumbnailViewItem*, OUString)
     return false;
 }
 
+BitmapEx ThumbnailView::readThumbnail(const OUString &msURL)
+{
+    using namespace ::com::sun::star;
+    using namespace ::com::sun::star::uno;
+
+    // Load the thumbnail from a template document.
+    uno::Reference<io::XInputStream> xIStream;
+
+    uno::Reference< uno::XComponentContext > xContext(::comphelper::getProcessComponentContext());
+    try
+    {
+        uno::Reference<lang::XSingleServiceFactory> xStorageFactory = embed::StorageFactory::create(xContext);
+
+        uno::Sequence<uno::Any> aArgs (2);
+        aArgs[0] <<= msURL;
+        aArgs[1] <<= embed::ElementModes::READ;
+        uno::Reference<embed::XStorage> xDocStorage (
+            xStorageFactory->createInstanceWithArguments(aArgs),
+            uno::UNO_QUERY);
+
+        try
+        {
+            if (xDocStorage.is())
+            {
+                uno::Reference<embed::XStorage> xStorage (
+                    xDocStorage->openStorageElement(
+                        "Thumbnails",
+                        embed::ElementModes::READ));
+                if (xStorage.is())
+                {
+                    uno::Reference<io::XStream> xThumbnailCopy (
+                        xStorage->cloneStreamElement("thumbnail.png"));
+                    if (xThumbnailCopy.is())
+                        xIStream = xThumbnailCopy->getInputStream();
+                }
+            }
+        }
+        catch (const uno::Exception& rException)
+        {
+            OSL_TRACE (
+                "caught exception while trying to access Thumbnail/thumbnail.png of %s: %s",
+                OUStringToOString(msURL,
+                    RTL_TEXTENCODING_UTF8).getStr(),
+                OUStringToOString(rException.Message,
+                    RTL_TEXTENCODING_UTF8).getStr());
+        }
+
+        try
+        {
+            // An (older) implementation had a bug - The storage
+            // name was "Thumbnail" instead of "Thumbnails".  The
+            // old name is still used as fallback but this code can
+            // be removed soon.
+            if ( ! xIStream.is())
+            {
+                uno::Reference<embed::XStorage> xStorage (
+                    xDocStorage->openStorageElement( "Thumbnail",
+                        embed::ElementModes::READ));
+                if (xStorage.is())
+                {
+                    uno::Reference<io::XStream> xThumbnailCopy (
+                        xStorage->cloneStreamElement("thumbnail.png"));
+                    if (xThumbnailCopy.is())
+                        xIStream = xThumbnailCopy->getInputStream();
+                }
+            }
+        }
+        catch (const uno::Exception& rException)
+        {
+            OSL_TRACE (
+                "caught exception while trying to access Thumbnails/thumbnail.png of %s: %s",
+                OUStringToOString(msURL,
+                    RTL_TEXTENCODING_UTF8).getStr(),
+                OUStringToOString(rException.Message,
+                    RTL_TEXTENCODING_UTF8).getStr());
+        }
+    }
+    catch (const uno::Exception& rException)
+    {
+        OSL_TRACE (
+            "caught exception while trying to access tuhmbnail of %s: %s",
+            OUStringToOString(msURL,
+                RTL_TEXTENCODING_UTF8).getStr(),
+            OUStringToOString(rException.Message,
+                RTL_TEXTENCODING_UTF8).getStr());
+    }
+
+    // Extract the image from the stream.
+    BitmapEx aThumbnail;
+    if (xIStream.is())
+    {
+        ::std::auto_ptr<SvStream> pStream (
+            ::utl::UcbStreamHelper::CreateStream (xIStream));
+        ::vcl::PNGReader aReader (*pStream);
+        aThumbnail = aReader.Read ();
+    }
+
+    // Note that the preview is returned without scaling it to the desired
+    // width.  This gives the caller the chance to take advantage of a
+    // possibly larger resolution then was asked for.
+    return aThumbnail;
+}
+
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