tdf#117015 EMF+ Fix for displaying EMF+ files where GetDC is used

With EMF+ Only mode, still the EMF records could be used for
displaying objects, by using Get Device Context (GetDC).
Files identified as EMF+ Only can contain both EMF+ records and EMF records. All EMF+
records are used to render the image. The EMF records that are part of the drawing are those
preceded by a Get Device Context record.

Unfortunately after finishing EMF drawing, the clip region was
not reset. As a result records after EMF record was not displayed.

With this patch, the issue was fixed by resetting clip region.

Change-Id: I998b14e7c3b56a7711ba6a7bec08ec2097e0dfce
Reviewed-on: https://gerrit.libreoffice.org/52897
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Bartosz Kosiorek <gang65@poczta.onet.pl>

2 files changed, 10 insertions, 1 deletions

diff --git a/drawinglayer/source/tools/emfphelperdata.cxx b/drawinglayer/source/tools/emfphelperdata.cxx
index 3c9d10e62fd8..a7c455cfc1aa 100644
--- a/drawinglayer/source/tools/emfphelperdata.cxx
+++ b/drawinglayer/source/tools/emfphelperdata.cxx
@@ -745,7 +745,8 @@ namespace emfplushelper
         mMFlags(0),
         mMStream(),
         mrTargetHolders(rTargetHolders),
-        mrPropertyHolders(rPropertyHolders)
+        mrPropertyHolders(rPropertyHolders),
+        bIsGetDCProcessing(false)
     {
         rMS.ReadInt32(mnFrameLeft).ReadInt32(mnFrameTop).ReadInt32(mnFrameRight).ReadInt32(mnFrameBottom);
         SAL_INFO("drawinglayer", "EMF+ picture frame: " << mnFrameLeft << "," << mnFrameTop << " - " << mnFrameRight << "," << mnFrameBottom);
@@ -838,6 +839,12 @@ namespace emfplushelper
 
             SAL_INFO("drawinglayer", "EMF+ record size: " << size << " type: " << emfTypeToName(type) << " flags: " << flags << " data size: " << dataSize);
 
+            if (bIsGetDCProcessing)
+            {
+                SAL_INFO("drawinglayer", "EMF+ Resets the current clipping region for the world space to infinity.");
+                wmfemfhelper::HandleNewClipRegion(::basegfx::B2DPolyPolygon(), mrTargetHolders, mrPropertyHolders);
+                bIsGetDCProcessing = false;
+            }
             if (type == EmfPlusRecordTypeObject && ((mbMultipart && (flags & 0x7fff) == (mMFlags & 0x7fff)) || (flags & 0x8000)))
             {
                 if (!mbMultipart)
@@ -912,6 +919,7 @@ namespace emfplushelper
                     }
                     case EmfPlusRecordTypeGetDC:
                     {
+                        bIsGetDCProcessing = true;
                         SAL_INFO("drawinglayer", "EMF+ GetDC");
                         SAL_INFO("drawinglayer", "EMF+\talready used in svtools wmf/emf filter parser");
                         break;
diff --git a/drawinglayer/source/tools/emfphelperdata.hxx b/drawinglayer/source/tools/emfphelperdata.hxx
index e5402d1fe267..281a5f7ebbba 100644
--- a/drawinglayer/source/tools/emfphelperdata.hxx
+++ b/drawinglayer/source/tools/emfphelperdata.hxx
@@ -171,6 +171,7 @@ namespace emfplushelper
         /// data holders
         wmfemfhelper::TargetHolders&    mrTargetHolders;
         wmfemfhelper::PropertyHolders&  mrPropertyHolders;
+        bool                            bIsGetDCProcessing;
 
         // readers
         void processObjectRecord(SvMemoryStream& rObjectStream, sal_uInt16 flags, sal_uInt32 dataSize, bool bUseWholeStream = false);