tdf#147818 EMF+ Fix restoring clipping states

With previous implementation the clipping restoring with EmfPlusRecordTypeRestore
was implemented wrongly as it is only taken to account
the shape of clipping (state.getClipPolyPolygon) and doesn't
take if clipping was even enabled (state.getClipPolyPolygonActive).

Additionally the changing states should be made by using method:
wmfemfhelper::HandleNewClipRegion() and not directly.

The similar implementation was applied also to EmfPlusRecordTypeGetDC.

Additionally the clipping for
EmfPlusRecordTypeSetClipRect
EmfPlusRecordTypeSetClipPath
EmfPlusRecordTypeSetClipRegion
was fixed, as initially the clipping is disabled (state.getClipPolyPolygonActive)
and the clipping shape is empty (state.getClipPolyPolygon).
It means that combination other than EmfPlusCombineModeReplace,
was not working correctly.

With this implementation, if Clipping is disabled, then treat clip combining
in special way.

Change-Id: I258bda64e8bfdade7f47ffc7518bf04b7340344f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/132415
Tested-by: Jenkins
Reviewed-by: Bartosz Kosiorek <gang65@poczta.onet.pl>

2 files changed, 118 insertions, 65 deletions

diff --git a/drawinglayer/source/tools/emfphelperdata.cxx b/drawinglayer/source/tools/emfphelperdata.cxx
index 447686167837..e60f8815ef79 100644
--- a/drawinglayer/source/tools/emfphelperdata.cxx
+++ b/drawinglayer/source/tools/emfphelperdata.cxx
@@ -486,18 +486,32 @@ namespace emfplushelper
         map[ index ] = state;
     }
 
-    void EmfPlusHelperData::GraphicStatePop(GraphicStateMap& map, sal_Int32 index, wmfemfhelper::PropertyHolder& rState)
+    void EmfPlusHelperData::GraphicStatePop(GraphicStateMap& map, sal_Int32 index)
     {
-        GraphicStateMap::iterator iter = map.find( index );
+        GraphicStateMap::iterator iter = map.find(index);
 
-        if ( iter != map.end() )
+        if (iter != map.end())
         {
             wmfemfhelper::PropertyHolder state = iter->second;
 
             maWorldTransform = state.getTransformation();
-            rState.setClipPolyPolygon( state.getClipPolyPolygon() );
+            if (state.getClipPolyPolygonActive())
+            {
+                SAL_INFO("drawinglayer.emf",
+                        "EMF+\t Restore clipping region to saved in index: " << index);
+                wmfemfhelper::HandleNewClipRegion(state.getClipPolyPolygon(), mrTargetHolders,
+                                                  mrPropertyHolders);
+            }
+            else
+            {
+                SAL_INFO("drawinglayer.emf", "EMF+\t Disable clipping");
+                wmfemfhelper::HandleNewClipRegion(::basegfx::B2DPolyPolygon(), mrTargetHolders,
+                                                  mrPropertyHolders);
+            }
             mappingChanged();
-            SAL_INFO("drawinglayer.emf", "EMF+\t\tStack index: " << index << " found, maWorldTransform: " << maWorldTransform);
+            SAL_INFO("drawinglayer.emf",
+                    "EMF+\t\tStack index: " << index
+                                            << " found, maWorldTransform: " << maWorldTransform);
         }
     }
 
@@ -1000,14 +1014,8 @@ namespace emfplushelper
         }
         case EmfPlusCombineModeIntersect:
         {
-            if (leftPolygon.count())
-            {
-                aClippedPolyPolygon = basegfx::utils::clipPolyPolygonOnPolyPolygon(
-                            leftPolygon,
-                            rightPolygon,
-                            true,
-                            false);
-            }
+            aClippedPolyPolygon = basegfx::utils::clipPolyPolygonOnPolyPolygon(
+                leftPolygon, rightPolygon, true, false);
             break;
         }
         case EmfPlusCombineModeUnion:
@@ -1080,8 +1088,18 @@ namespace emfplushelper
 
             if (bIsGetDCProcessing)
             {
-                SAL_INFO("drawinglayer.emf", "EMF+\t reset the current clipping region for the world space to infinity.");
-                wmfemfhelper::HandleNewClipRegion(::basegfx::B2DPolyPolygon(), mrTargetHolders, mrPropertyHolders);
+                if (aGetDCState.getClipPolyPolygonActive())
+                {
+                    SAL_INFO("drawinglayer.emf", "EMF+\t Restore region to GetDC saved");
+                    wmfemfhelper::HandleNewClipRegion(aGetDCState.getClipPolyPolygon(), mrTargetHolders,
+                                                      mrPropertyHolders);
+                }
+                else
+                {
+                    SAL_INFO("drawinglayer.emf", "EMF+\t Disable clipping");
+                    wmfemfhelper::HandleNewClipRegion(::basegfx::B2DPolyPolygon(), mrTargetHolders,
+                                                      mrPropertyHolders);
+                }
                 bIsGetDCProcessing = false;
             }
             if (type == EmfPlusRecordTypeObject && ((mbMultipart && (flags & 0x7fff) == (mMFlags & 0x7fff)) || (flags & 0x8000)))
@@ -1160,6 +1178,7 @@ namespace emfplushelper
                     case EmfPlusRecordTypeGetDC:
                     {
                         bIsGetDCProcessing = true;
+                        aGetDCState = mrPropertyHolders.Current();
                         SAL_INFO("drawinglayer.emf", "EMF+\tAlready used in svtools wmf/emf filter parser");
                         break;
                     }
@@ -1819,7 +1838,7 @@ namespace emfplushelper
                         rMS.ReadUInt32(stackIndex);
                         SAL_INFO("drawinglayer.emf", "EMF+\t Restore stack index: " << stackIndex);
 
-                        GraphicStatePop(mGSStack, stackIndex, mrPropertyHolders.Current());
+                        GraphicStatePop(mGSStack, stackIndex);
                         break;
                     }
                     case EmfPlusRecordTypeBeginContainer:
@@ -1866,7 +1885,7 @@ namespace emfplushelper
                         rMS.ReadUInt32(stackIndex);
                         SAL_INFO("drawinglayer.emf", "EMF+\t End Container stack index: " << stackIndex);
 
-                        GraphicStatePop(mGSContainerStack, stackIndex, mrPropertyHolders.Current());
+                        GraphicStatePop(mGSContainerStack, stackIndex);
                         break;
                     }
                     case EmfPlusRecordTypeSetWorldTransform:
@@ -2001,62 +2020,95 @@ namespace emfplushelper
                         break;
                     }
                     case EmfPlusRecordTypeSetClipRect:
-                    {
-                        int combineMode = (flags >> 8) & 0xf;
-
-                        SAL_INFO("drawinglayer.emf", "EMF+\t SetClipRect combine mode: " << combineMode);
-
-                        float dx, dy, dw, dh;
-                        ReadRectangle(rMS, dx, dy, dw, dh);
-                        SAL_INFO("drawinglayer.emf", "EMF+\t RectData: " << dx << "," << dy << " " << dw << "x" << dh);
-                        ::basegfx::B2DPoint mappedPoint1(Map(dx, dy));
-                        ::basegfx::B2DPoint mappedPoint2(Map(dx + dw, dy + dh));
-
-                        ::basegfx::B2DPolyPolygon polyPolygon(
-                                ::basegfx::utils::createPolygonFromRect(
-                                    ::basegfx::B2DRectangle(
-                                        mappedPoint1.getX(),
-                                        mappedPoint1.getY(),
-                                        mappedPoint2.getX(),
-                                        mappedPoint2.getY())));
-
-                        HandleNewClipRegion(combineClip(mrPropertyHolders.Current().getClipPolyPolygon(),
-                                                        combineMode, polyPolygon), mrTargetHolders, mrPropertyHolders);
-                        break;
-                    }
                     case EmfPlusRecordTypeSetClipPath:
+                    case EmfPlusRecordTypeSetClipRegion:
                     {
                         int combineMode = (flags >> 8) & 0xf;
-                        SAL_INFO("drawinglayer.emf", "EMF+\t SetClipPath combine mode: " << combineMode);
-                        SAL_INFO("drawinglayer.emf", "EMF+\t Path in slot: " << (flags & 0xff));
-
-                        EMFPPath *path = dynamic_cast<EMFPPath*>(maEMFPObjects[flags & 0xff].get());
-                        if (!path)
+                        ::basegfx::B2DPolyPolygon polyPolygon;
+                        if (type == EmfPlusRecordTypeSetClipRect)
                         {
-                            SAL_WARN("drawinglayer.emf", "EMF+\t TODO Unable to find path in slot: " << (flags & 0xff));
-                            break;
-                        }
+                            SAL_INFO("drawinglayer.emf", "EMF+\t SetClipRect");
 
-                        ::basegfx::B2DPolyPolygon& clipPoly(path->GetPolygon(*this));
+                            float dx, dy, dw, dh;
+                            ReadRectangle(rMS, dx, dy, dw, dh);
+                            SAL_INFO("drawinglayer.emf",
+                                    "EMF+\t RectData: " << dx << "," << dy << " " << dw << "x" << dh);
+                            ::basegfx::B2DPoint mappedPoint1(Map(dx, dy));
+                            ::basegfx::B2DPoint mappedPoint2(Map(dx + dw, dy + dh));
+
+                            polyPolygon
+                                = ::basegfx::B2DPolyPolygon(::basegfx::utils::createPolygonFromRect(
+                                    ::basegfx::B2DRectangle(mappedPoint1.getX(), mappedPoint1.getY(),
+                                                            mappedPoint2.getX(), mappedPoint2.getY())));
+                        }
+                        else if (type == EmfPlusRecordTypeSetClipPath)
+                        {
+                            SAL_INFO("drawinglayer.emf", "EMF+\tSetClipPath " << (flags & 0xff));
 
-                        HandleNewClipRegion(combineClip(mrPropertyHolders.Current().getClipPolyPolygon(),
-                                                        combineMode, clipPoly), mrTargetHolders, mrPropertyHolders);
-                        break;
-                    }
-                    case EmfPlusRecordTypeSetClipRegion:
-                    {
-                        int combineMode = (flags >> 8) & 0xf;
-                        SAL_INFO("drawinglayer.emf", "EMF+\t Region in slot: " << (flags & 0xff));
+                            EMFPPath* path = dynamic_cast<EMFPPath*>(maEMFPObjects[flags & 0xff].get());
+                            if (!path)
+                            {
+                                SAL_WARN("drawinglayer.emf",
+                                        "EMF+\t TODO Unable to find path in slot: " << (flags & 0xff));
+                                break;
+                            }
+                            polyPolygon = path->GetPolygon(*this);
+                        }
+                        else if (type == EmfPlusRecordTypeSetClipRegion)
+                        {
+                            SAL_INFO("drawinglayer.emf", "EMF+\t Region in slot: " << (flags & 0xff));
+                            EMFPRegion* region
+                                = dynamic_cast<EMFPRegion*>(maEMFPObjects[flags & 0xff].get());
+                            if (!region)
+                            {
+                                SAL_WARN(
+                                    "drawinglayer.emf",
+                                    "EMF+\t TODO Unable to find region in slot: " << (flags & 0xff));
+                                break;
+                            }
+                            polyPolygon = region->regionPolyPolygon;
+                        }
                         SAL_INFO("drawinglayer.emf", "EMF+\t Combine mode: " << combineMode);
-                        EMFPRegion *region = dynamic_cast<EMFPRegion*>(maEMFPObjects[flags & 0xff].get());
-                        if (!region)
+                        ::basegfx::B2DPolyPolygon aClippedPolyPolygon;
+                        if (mrPropertyHolders.Current().getClipPolyPolygonActive())
                         {
-                            SAL_WARN("drawinglayer.emf", "EMF+\t TODO Unable to find region in slot: " << (flags & 0xff));
-                            break;
+                            aClippedPolyPolygon
+                                = combineClip(mrPropertyHolders.Current().getClipPolyPolygon(),
+                                            combineMode, polyPolygon);
                         }
-
-                        HandleNewClipRegion(combineClip(mrPropertyHolders.Current().getClipPolyPolygon(),
-                                                        combineMode, region->regionPolyPolygon), mrTargetHolders, mrPropertyHolders);
+                        else
+                        {
+                            //Combine with infinity
+                            switch (combineMode)
+                            {
+                                case EmfPlusCombineModeReplace:
+                                case EmfPlusCombineModeIntersect:
+                                {
+                                    aClippedPolyPolygon = polyPolygon;
+                                    break;
+                                }
+                                case EmfPlusCombineModeUnion:
+                                {
+                                    // Disable clipping as the clipping is infinity
+                                    aClippedPolyPolygon = ::basegfx::B2DPolyPolygon();
+                                    break;
+                                }
+                                case EmfPlusCombineModeXOR:
+                                case EmfPlusCombineModeComplement:
+                                {
+                                    //TODO It is not correct and it should be fixed
+                                    aClippedPolyPolygon = polyPolygon;
+                                    break;
+                                }
+                                case EmfPlusCombineModeExclude:
+                                {
+                                    //TODO It is not correct and it should be fixed
+                                    aClippedPolyPolygon = ::basegfx::B2DPolyPolygon();
+                                    break;
+                                }
+                            }
+                        }
+                        HandleNewClipRegion(aClippedPolyPolygon, mrTargetHolders, mrPropertyHolders);
                         break;
                     }
                     case EmfPlusRecordTypeOffsetClip:
diff --git a/drawinglayer/source/tools/emfphelperdata.hxx b/drawinglayer/source/tools/emfphelperdata.hxx
index cf3474b5b1a7..563f7773c3ba 100644
--- a/drawinglayer/source/tools/emfphelperdata.hxx
+++ b/drawinglayer/source/tools/emfphelperdata.hxx
@@ -213,6 +213,7 @@ namespace emfplushelper
         /// data holders
         wmfemfhelper::TargetHolders&    mrTargetHolders;
         wmfemfhelper::PropertyHolders&  mrPropertyHolders;
+        wmfemfhelper::PropertyHolder    aGetDCState;
         bool                            bIsGetDCProcessing;
 
         // readers
@@ -224,7 +225,7 @@ namespace emfplushelper
 
         // stack actions
         void GraphicStatePush(GraphicStateMap& map, sal_Int32 index);
-        void GraphicStatePop (GraphicStateMap& map, sal_Int32 index, wmfemfhelper::PropertyHolder& rState);
+        void GraphicStatePop(GraphicStateMap& map, sal_Int32 index);
 
         // primitive creators
         void EMFPPlusDrawPolygon(const ::basegfx::B2DPolyPolygon& polygon, sal_uInt32 penIndex);