tdf#98409 doc export: export (non-default) cell margins

Previously, the only cell margins that were being
exported were the row defaults from the last column.

These cell margins are tricky, because multiple
cells and multiple sides can be combined together
into a single definition.

A previous commit for tdf#73056 was needed to import
these sequences - instead of only the first instance.

Change-Id: I513c432ec11a78c7bb52ac6fb628851192e88023
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/93638
Tested-by: Andras Timar <andras.timar@collabora.com>
Reviewed-by: Andras Timar <andras.timar@collabora.com>

2 files changed, 61 insertions, 3 deletions

diff --git a/sw/qa/extras/ww8export/ww8export3.cxx b/sw/qa/extras/ww8export/ww8export3.cxx
index acc68352102d..c8bbe96a1b9d 100644
--- a/sw/qa/extras/ww8export/ww8export3.cxx
+++ b/sw/qa/extras/ww8export/ww8export3.cxx
@@ -171,9 +171,8 @@ DECLARE_WW8EXPORT_TEST(testTdf73056_cellMargins, "tdf73056_cellMargins.doc")
 
     // only the first cell with specific margins was processed, leaving the rest at table defaults. Was 0.
     uno::Reference< beans::XPropertySet > xPropSet( xCell, uno::UNO_QUERY_THROW );
-    if ( !mbExported )
-        CPPUNIT_ASSERT_EQUAL_MESSAGE( "bottom cell spacing to contents",
-            sal_Int32(101), getProperty<sal_Int32>(xPropSet, "BottomBorderDistance" ) );
+    CPPUNIT_ASSERT_EQUAL_MESSAGE( "bottom cell spacing to contents",
+        sal_Int32(101), getProperty<sal_Int32>(xPropSet, "BottomBorderDistance" ) );
 }
 DECLARE_WW8EXPORT_TEST(testTdf79435_legacyInputFields, "tdf79435_legacyInputFields.docx")
 {
diff --git a/sw/source/filter/ww8/wrtww8.cxx b/sw/source/filter/ww8/wrtww8.cxx
index e908cab35162..555f01de8f7d 100644
--- a/sw/source/filter/ww8/wrtww8.cxx
+++ b/sw/source/filter/ww8/wrtww8.cxx
@@ -2571,6 +2571,21 @@ void WW8AttributeOutput::TableCellBorders(
     const SvxBoxItem * pLastBox = nullptr;
     sal_uInt8 nSeqStart = 0; // start of sequence of cells with same borders
 
+    static const SvxBoxItemLine aBorders[] =
+    {
+        SvxBoxItemLine::TOP, SvxBoxItemLine::LEFT,
+        SvxBoxItemLine::BOTTOM, SvxBoxItemLine::RIGHT
+    };
+
+    sal_uInt16 nDefaultMargin[4] = {31681, 31681, 31681, 31681};  // outside of documented valid range
+    // last column in each row defines the row default in TableRowDefaultBorders()
+    if ( nBoxes && rTabBoxes.size() == nBoxes )
+    {
+        const SvxBoxItem& rBox = rTabBoxes[ nBoxes-1 ]->GetFrameFormat()->GetBox();
+        for ( int i = 0; i < 4; ++i )
+            nDefaultMargin[i] = rBox.GetDistance( aBorders[i] );
+    }
+
     // Detect sequences of cells which have the same borders, and output
     // a border description for each such cell range.
     for ( unsigned n = 0; n <= nBoxes; ++n )
@@ -2581,9 +2596,53 @@ void WW8AttributeOutput::TableCellBorders(
             pLastBox = pBox;
         else if( !pBox || *pLastBox != *pBox )
         {
+            if ( !pLastBox )
+                break;
+
             // This cell has different borders than the previous cell,
             // so output the borders for the preceding cell range.
             m_rWW8Export.Out_CellRangeBorders(pLastBox, nSeqStart, n);
+
+            // The last column is used as the row default for margins, so we can ignore these matching ones
+            if ( n == nBoxes )
+                break;
+
+            // Output cell margins.
+            // One CSSA can define up to all four margins if they are the same size value.
+            sal_uInt16 nMargin[4];
+            sal_uInt8 nSideBits[4] = {0, 0, 0, 0}; // 0001:top, 0010:left, 0100:bottom, 1000:right
+            for ( int i = 0; i < 4; ++i )  // sides: top, left, bottom, right
+            {
+                nMargin[i] = std::min(sal_uInt16(31680), pLastBox->GetDistance( aBorders[i] ));
+                if ( nMargin[i] == nDefaultMargin[i] )
+                    continue;
+
+                // join a previous side's definition if it shares the same value
+                for ( int p = 0; p < 4; ++p )
+                {
+                    if ( nMargin[i] == nMargin[p] )
+                    {
+                        nSideBits[p] |= 1 << i;
+                        break;
+                    }
+                }
+            }
+
+            // write out the cell margins definitions that were used
+            for ( int i = 0; i < 4; ++i )
+            {
+                if ( nSideBits[i] )
+                {
+                    SwWW8Writer::InsUInt16( *m_rWW8Export.pO, NS_sprm::sprmTCellPadding );
+                    m_rWW8Export.pO->push_back( sal_uInt8(6) );            // 6 bytes
+                    m_rWW8Export.pO->push_back( sal_uInt8(nSeqStart) );    // first cell: apply margin
+                    m_rWW8Export.pO->push_back( sal_uInt8(n) );            // end cell: do not apply margin
+                    m_rWW8Export.pO->push_back( sal_uInt8(nSideBits[i]) );
+                    m_rWW8Export.pO->push_back( sal_uInt8(3) );            // FtsDxa: size in twips
+                    SwWW8Writer::InsUInt16( *m_rWW8Export.pO, nMargin[i] );
+                }
+            }
+
             nSeqStart = n;
             pLastBox = pBox;
         }