Rewrite import and export of custom dashes in ooxml filter (fix)

The import mechanism of custom-dash (a:custDash) was wrong, and imported
wrong values, which causes that if you would import-export-import-export -
you would get inflated values, which might cause a corruption.

The attributes for custom-dash nodes (a:ds) are of type 'PositivePercentage'.
Office will read percentages formatted with a trailing percent sign or
formatted as 1000th of a percent without a trailing percent sign, but only
write percentages as 1000th's of a percent without a trailing percent sign.

During import - LO did not check if it was in '%' format or in
'1000th of a percent' format. So that was fixed. Also - when exporting -
it always exports now in '1000th of a percent' format.

Change-Id: I6bd74df26951974f85173227c832386c70034afb
Reviewed-on: https://gerrit.libreoffice.org/9681
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>

3 files changed, 91 insertions, 21 deletions

diff --git a/oox/source/drawingml/lineproperties.cxx b/oox/source/drawingml/lineproperties.cxx
index 2044095c484b..372740b36006 100644
--- a/oox/source/drawingml/lineproperties.cxx
+++ b/oox/source/drawingml/lineproperties.cxx
@@ -107,19 +107,26 @@ void lclConvertCustomDash( LineDash& orLineDash, const LineProperties::DashStopV
     sal_Int16 nDashes = 0;
     sal_Int32 nDashLen = 0;
     sal_Int32 nDistance = 0;
+    sal_Int32 nConvertedLen = 0;
+    sal_Int32 nConvertedDistance = 0;
     for( LineProperties::DashStopVector::const_iterator aIt = rCustomDash.begin(), aEnd = rCustomDash.end(); aIt != aEnd; ++aIt )
     {
-        if( aIt->first <= 2 )
+        // Get from "1000th of percent" ==> percent ==> multiplier
+        nConvertedLen      = aIt->first  / 1000 / 100;
+        nConvertedDistance = aIt->second / 1000 / 100;
+
+        // Check if it is a dot (100% = dot)
+        if( nConvertedLen == 1 )
         {
             ++nDots;
-            nDotLen += aIt->first;
+            nDotLen += nConvertedLen;
         }
         else
         {
             ++nDashes;
-            nDashLen += aIt->first;
+            nDashLen += nConvertedLen;
         }
-        nDistance += aIt->second;
+        nDistance += nConvertedDistance;
     }
     orLineDash.DotLen = (nDots > 0) ? ::std::max< sal_Int32 >( nDotLen / nDots, 1 ) : 0;
     orLineDash.Dots = nDots;
diff --git a/oox/source/drawingml/linepropertiescontext.cxx b/oox/source/drawingml/linepropertiescontext.cxx
index 3195e569881b..ee49fbaddbb5 100644
--- a/oox/source/drawingml/linepropertiescontext.cxx
+++ b/oox/source/drawingml/linepropertiescontext.cxx
@@ -66,8 +66,50 @@ ContextHandlerRef LinePropertiesContext::onCreateContext( sal_Int32 nElement, co
             return this;
         break;
         case A_TOKEN( ds ):
-            mrLineProperties.maCustomDash.push_back( LineProperties::DashStop(
-                rAttribs.getInteger( XML_d, 0 ), rAttribs.getInteger( XML_sp, 0 ) ) );
+        {
+            // 'a:ds' has 2 attributes : 'd' and 'sp'
+            // both are of type 'a:ST_PositivePercentage'
+            // according to the specs Office will read percentages formatted with a trailing percent sign
+            // or formatted as 1000th of a percent without a trailing percent sign, but only write percentages
+            // as 1000th's of a percent without a trailing percent sign.
+            // The code below takes care of both scenarios by converting to '1000th of a percent' always
+            OUString aStr;
+            sal_Int32 nDash = 0;
+            aStr = rAttribs.getString( XML_d, "" );
+            if ( aStr.endsWith("%") )
+            {
+                // Ends with a '%'
+                aStr = aStr.copy(0, aStr.getLength() - 1);
+                aStr = aStr.trim();
+                nDash = aStr.toInt32();
+
+                // Convert to 1000th of a percent
+                nDash *= 1000;
+            }
+            else
+            {
+                nDash = rAttribs.getInteger( XML_d, 0 );
+            }
+
+            sal_Int32 nSp = 0;
+            aStr = rAttribs.getString( XML_sp, "" );
+            if ( aStr.endsWith("%") )
+            {
+                // Ends with a '%'
+                aStr = aStr.copy(0, aStr.getLength() - 1);
+                aStr = aStr.trim();
+                nSp = aStr.toInt32();
+
+                // Convert to 1000th of a percent
+                nSp *= 1000;
+            }
+            else
+            {
+                nSp = rAttribs.getInteger( XML_sp, 0 );
+            }
+
+            mrLineProperties.maCustomDash.push_back( LineProperties::DashStop( nDash, nSp ) );
+        }
         break;
 
         // LineJoinPropertiesGroup
diff --git a/oox/source/export/drawingml.cxx b/oox/source/export/drawingml.cxx
index 42d007a7aa5f..6340b6e9c051 100644
--- a/oox/source/export/drawingml.cxx
+++ b/oox/source/export/drawingml.cxx
@@ -626,24 +626,45 @@ void DrawingML::WriteOutline( Reference< XPropertySet > rXPropSet )
 
     if( bDashSet && aStyleLineStyle != drawing::LineStyle_DASH ) {
         // line style is a dash and it was not set by the shape style
-        // TODO: the XML_d and XML_sp values seem insane
+
         mpFS->startElementNS( XML_a, XML_custDash, FSEND );
 
-        aLineDash.DotLen = aLineDash.DotLen / nLineWidth;
-        aLineDash.DashLen = aLineDash.DashLen / nLineWidth;
-        aLineDash.Distance = aLineDash.Distance / nLineWidth;
+        // Check that line-width is positive and distance between dashes\dots is positive
+        if ( nLineWidth > 0 && aLineDash.Distance > 0 )
+        {
+            // Write 'dashes' first, and then 'dots'
+            int i;
+            if ( aLineDash.Dashes > 0 )
+            {
+                for( i = 0; i < aLineDash.Dashes; i ++ )
+                    mpFS->singleElementNS( XML_a , XML_ds,
+                                           XML_d , write1000thOfAPercent( aLineDash.DashLen  > 0 ? aLineDash.DashLen  / nLineWidth * 100 : 100 ),
+                                           XML_sp, write1000thOfAPercent( aLineDash.Distance > 0 ? aLineDash.Distance / nLineWidth * 100 : 100 ),
+                                           FSEND );
+            }
+            if ( aLineDash.Dots > 0 )
+            {
+                for( i = 0; i < aLineDash.Dots; i ++ )
+                    mpFS->singleElementNS( XML_a, XML_ds,
+                                           XML_d , write1000thOfAPercent( aLineDash.DotLen   > 0 ? aLineDash.DotLen   / nLineWidth * 100 : 100 ),
+                                           XML_sp, write1000thOfAPercent( aLineDash.Distance > 0 ? aLineDash.Distance / nLineWidth * 100 : 100 ),
+                                           FSEND );
+            }
+        }
+
+        if ( nLineWidth <= 0 )
+            SAL_WARN("oox", "while writing outline - custom dash - line width was < 0  : " << nLineWidth);
+        if ( aLineDash.Dashes < 0 )
+            SAL_WARN("oox", "while writing outline - custom dash - number of dashes was < 0  : " << aLineDash.Dashes);
+        if ( aLineDash.Dashes > 0 && aLineDash.DashLen <= 0 )
+            SAL_WARN("oox", "while writing outline - custom dash - dash length was < 0  : " << aLineDash.DashLen);
+        if ( aLineDash.Dots < 0 )
+            SAL_WARN("oox", "while writing outline - custom dash - number of dots was < 0  : " << aLineDash.Dots);
+        if ( aLineDash.Dots > 0 && aLineDash.DotLen <= 0 )
+            SAL_WARN("oox", "while writing outline - custom dash - dot length was < 0  : " << aLineDash.DotLen);
+        if ( aLineDash.Distance <= 0 )
+            SAL_WARN("oox", "while writing outline - custom dash - distance was < 0  : " << aLineDash.Distance);
 
-        int i;
-        for( i = 0; i < aLineDash.Dots; i ++ )
-            mpFS->singleElementNS( XML_a, XML_ds,
-                                   XML_d, aLineDash.DotLen ? writePercentage( aLineDash.DotLen*1000 ) : "100000%",
-                                   XML_sp, writePercentage( aLineDash.Distance*1000 ),
-                                   FSEND );
-        for( i = 0; i < aLineDash.Dashes; i ++ )
-            mpFS->singleElementNS( XML_a, XML_ds,
-                                   XML_d, aLineDash.DashLen ? writePercentage( aLineDash.DashLen*1000 ) : "100000%",
-                                   XML_sp, writePercentage( aLineDash.Distance*1000 ),
-                                   FSEND );
         mpFS->endElementNS( XML_a, XML_custDash );
     }