tdf#79679 vcl: dashed lines show as solid lines when importing EMF files

Backported fix to 5.0.

Issue is a regression in commit 09c722873b2d378d2d155f5f1dd7d8f3fb2012e9.
(EMF/WMF: fix rendering of pen styles (dash, dot, dashdot, dashdotdot).

I've looked at how the latest version of Word on the Mac works, and it
turns out that the spacings for the PenStyle enumerations in the LogPen
objects for all the create pen EMF records are as follows:

* PS_DOT           - ■ □ ■ □ ■ □ ■ □ ■ □ ■
* PS_DASHDOT       - ■ ■ ■ □ ■ □ ■ ■ ■ □ ■
* PS_DASHDOTDOT    - ■ ■ ■ □ ■ □ ■ □ ■ ■ ■

(where ■ is the actual filled in area, and □ is the space between the
filled in areas)

In other words, each dash fills in the space of three dots, and there
is the one dot worth of empty space between the dashes and dots. Each
"dot" has a width and height equal to the width specified in the pen.

So basically, we seem to be arbitrarily setting the dot, dash and
distance lengths arbitrarily, which were reasonable guesses but tended
to produce very odd lines at different zoom levels.

Change-Id: Ie8b5fa396e4fb0f480cb3594c8129a59f472c1b8
Reviewed-on: https://gerrit.libreoffice.org/22886
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/22928
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>

4 files changed, 26 insertions, 47 deletions

diff --git a/vcl/qa/cppunit/wmf/wmfimporttest.cxx b/vcl/qa/cppunit/wmf/wmfimporttest.cxx
index 32c4d9019c95..176ff5dda15e 100644
--- a/vcl/qa/cppunit/wmf/wmfimporttest.cxx
+++ b/vcl/qa/cppunit/wmf/wmfimporttest.cxx
@@ -146,38 +146,38 @@ void WmfTest::testEmfLineStyles()
     assertXPath(pDoc, "/metafile/linecolor[5]", "color", "#0000ff");
 
     assertXPath(pDoc, "/metafile/line[1]", "style", "dash");
-    assertXPath(pDoc, "/metafile/line[1]", "dashlen", "225");
+    assertXPath(pDoc, "/metafile/line[1]", "dashlen", "528");
     assertXPath(pDoc, "/metafile/line[1]", "dashcount", "1");
-    assertXPath(pDoc, "/metafile/line[1]", "dotlen", "0");
+    assertXPath(pDoc, "/metafile/line[1]", "dotlen", "176");
     assertXPath(pDoc, "/metafile/line[1]", "dotcount", "0");
-    assertXPath(pDoc, "/metafile/line[1]", "distance", "100");
+    assertXPath(pDoc, "/metafile/line[1]", "distance", "176");
     assertXPath(pDoc, "/metafile/line[1]", "join", "miter");
     assertXPath(pDoc, "/metafile/line[1]", "cap", "butt");
 
     assertXPath(pDoc, "/metafile/line[2]", "style", "dash");
-    assertXPath(pDoc, "/metafile/line[2]", "dashlen", "0");
+    assertXPath(pDoc, "/metafile/line[2]", "dashlen", "528");
     assertXPath(pDoc, "/metafile/line[2]", "dashcount", "0");
-    assertXPath(pDoc, "/metafile/line[2]", "dotlen", "30");
+    assertXPath(pDoc, "/metafile/line[2]", "dotlen", "176");
     assertXPath(pDoc, "/metafile/line[2]", "dotcount", "1");
-    assertXPath(pDoc, "/metafile/line[2]", "distance", "50");
+    assertXPath(pDoc, "/metafile/line[2]", "distance", "176");
     assertXPath(pDoc, "/metafile/line[2]", "join", "miter");
     assertXPath(pDoc, "/metafile/line[2]", "cap", "butt");
 
     assertXPath(pDoc, "/metafile/line[3]", "style", "dash");
-    assertXPath(pDoc, "/metafile/line[3]", "dashlen", "150");
+    assertXPath(pDoc, "/metafile/line[3]", "dashlen", "528");
     assertXPath(pDoc, "/metafile/line[3]", "dashcount", "1");
-    assertXPath(pDoc, "/metafile/line[3]", "dotlen", "30");
+    assertXPath(pDoc, "/metafile/line[3]", "dotlen", "176");
     assertXPath(pDoc, "/metafile/line[3]", "dotcount", "1");
-    assertXPath(pDoc, "/metafile/line[3]", "distance", "90");
+    assertXPath(pDoc, "/metafile/line[3]", "distance", "176");
     assertXPath(pDoc, "/metafile/line[3]", "join", "miter");
     assertXPath(pDoc, "/metafile/line[3]", "cap", "butt");
 
     assertXPath(pDoc, "/metafile/line[4]", "style", "dash");
-    assertXPath(pDoc, "/metafile/line[4]", "dashlen", "150");
+    assertXPath(pDoc, "/metafile/line[4]", "dashlen", "528");
     assertXPath(pDoc, "/metafile/line[4]", "dashcount", "1");
-    assertXPath(pDoc, "/metafile/line[4]", "dotlen", "30");
+    assertXPath(pDoc, "/metafile/line[4]", "dotlen", "176");
     assertXPath(pDoc, "/metafile/line[4]", "dotcount", "2");
-    assertXPath(pDoc, "/metafile/line[4]", "distance", "50");
+    assertXPath(pDoc, "/metafile/line[4]", "distance", "176");
     assertXPath(pDoc, "/metafile/line[4]", "join", "miter");
     assertXPath(pDoc, "/metafile/line[4]", "cap", "butt");
 };
diff --git a/vcl/source/filter/wmf/enhwmf.cxx b/vcl/source/filter/wmf/enhwmf.cxx
index 5b1099dc0649..674f1b4d6d4c 100644
--- a/vcl/source/filter/wmf/enhwmf.cxx
+++ b/vcl/source/filter/wmf/enhwmf.cxx
@@ -17,11 +17,13 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#include "winmtf.hxx"
 #include <osl/endian.h>
 #include <basegfx/matrix/b2dhommatrix.hxx>
 #include <boost/bind.hpp>
 #include <vcl/dibtools.hxx>
+
+#include "winmtf.hxx"
+
 #include <boost/scoped_array.hpp>
 
 using namespace std;
@@ -902,37 +904,27 @@ bool EnhWMFReader::ReadEnhWMF()
                             aLineInfo.SetWidth( aSize.Width() );
 
                         bool bTransparent = false;
-                        switch( nStyle & 0xFF )
+                        switch( nStyle & PS_STYLE_MASK )
                         {
                             case PS_DASHDOTDOT :
                                 aLineInfo.SetStyle( LINE_DASH );
                                 aLineInfo.SetDashCount( 1 );
                                 aLineInfo.SetDotCount( 2 );
-                                aLineInfo.SetDashLen( 150 );
-                                aLineInfo.SetDotLen( 30 );
-                                aLineInfo.SetDistance( 50 );
                             break;
                             case PS_DASHDOT :
                                 aLineInfo.SetStyle( LINE_DASH );
                                 aLineInfo.SetDashCount( 1 );
                                 aLineInfo.SetDotCount( 1 );
-                                aLineInfo.SetDashLen( 150 );
-                                aLineInfo.SetDotLen( 30 );
-                                aLineInfo.SetDistance( 90 );
                             break;
                             case PS_DOT :
                                 aLineInfo.SetStyle( LINE_DASH );
                                 aLineInfo.SetDashCount( 0 );
                                 aLineInfo.SetDotCount( 1 );
-                                aLineInfo.SetDotLen( 30 );
-                                aLineInfo.SetDistance( 50 );
                             break;
                             case PS_DASH :
                                 aLineInfo.SetStyle( LINE_DASH );
                                 aLineInfo.SetDashCount( 1 );
                                 aLineInfo.SetDotCount( 0 );
-                                aLineInfo.SetDashLen( 225 );
-                                aLineInfo.SetDistance( 100 );
                             break;
                             case PS_NULL :
                                 bTransparent = true;
@@ -1005,31 +997,21 @@ bool EnhWMFReader::ReadEnhWMF()
                                 aLineInfo.SetStyle( LINE_DASH );
                                 aLineInfo.SetDashCount( 1 );
                                 aLineInfo.SetDotCount( 2 );
-                                aLineInfo.SetDashLen( 150 );
-                                aLineInfo.SetDotLen( 30 );
-                                aLineInfo.SetDistance( 50 );
                             break;
                             case PS_DASHDOT :
                                 aLineInfo.SetStyle( LINE_DASH );
                                 aLineInfo.SetDashCount( 1 );
                                 aLineInfo.SetDotCount( 1 );
-                                aLineInfo.SetDashLen( 150 );
-                                aLineInfo.SetDotLen( 30 );
-                                aLineInfo.SetDistance( 90 );
                             break;
                             case PS_DOT :
                                 aLineInfo.SetStyle( LINE_DASH );
                                 aLineInfo.SetDashCount( 0 );
                                 aLineInfo.SetDotCount( 1 );
-                                aLineInfo.SetDotLen( 30 );
-                                aLineInfo.SetDistance( 50 );
                             break;
                             case PS_DASH :
                                 aLineInfo.SetStyle( LINE_DASH );
                                 aLineInfo.SetDashCount( 1 );
                                 aLineInfo.SetDotCount( 0 );
-                                aLineInfo.SetDashLen( 225 );
-                                aLineInfo.SetDistance( 100 );
                             break;
                             case PS_NULL :
                                 bTransparent = true;
diff --git a/vcl/source/filter/wmf/winmtf.cxx b/vcl/source/filter/wmf/winmtf.cxx
index b2ae7dc65376..891ce44e781f 100644
--- a/vcl/source/filter/wmf/winmtf.cxx
+++ b/vcl/source/filter/wmf/winmtf.cxx
@@ -730,8 +730,16 @@ void WinMtfOutput::CreateObject( sal_Int32 nIndex, GDIObjectType eType, void* pS
             {
                 WinMtfLineStyle* pLineStyle = static_cast<WinMtfLineStyle*>(pStyle);
                 Size aSize(pLineStyle->aLineInfo.GetWidth(), 0);
-                aSize = ImplMap(aSize);
-                pLineStyle->aLineInfo.SetWidth(aSize.Width());
+                pLineStyle->aLineInfo.SetWidth( ImplMap(aSize).Width() );
+
+                if ( pLineStyle->aLineInfo.GetStyle() == LINE_DASH )
+                {
+                    aSize.Width() += 1;
+                    long nDotLen = ImplMap( aSize ).Width();
+                    pLineStyle->aLineInfo.SetDistance( nDotLen );
+                    pLineStyle->aLineInfo.SetDotLen( nDotLen );
+                    pLineStyle->aLineInfo.SetDashLen( nDotLen * 3 );
+                }
             }
         }
         if ( (sal_uInt32)nIndex >= vGDIObj.size() )
diff --git a/vcl/source/filter/wmf/winwmf.cxx b/vcl/source/filter/wmf/winwmf.cxx
index 04e553596fed..e89d5555997f 100644
--- a/vcl/source/filter/wmf/winwmf.cxx
+++ b/vcl/source/filter/wmf/winwmf.cxx
@@ -813,31 +813,20 @@ void WMFReader::ReadRecordParams( sal_uInt16 nFunc )
                     aLineInfo.SetStyle( LINE_DASH );
                     aLineInfo.SetDashCount( 1 );
                     aLineInfo.SetDotCount( 2 );
-                    aLineInfo.SetDashLen( 150 );
-                    aLineInfo.SetDotLen( 30 );
-                    aLineInfo.SetDistance( 50 );
                 break;
                 case PS_DASHDOT :
                     aLineInfo.SetStyle( LINE_DASH );
                     aLineInfo.SetDashCount( 1 );
                     aLineInfo.SetDotCount( 1 );
-                    aLineInfo.SetDashLen( 150 );
-                    aLineInfo.SetDotLen( 30 );
-                    aLineInfo.SetDistance( 90 );
                 break;
                 case PS_DOT :
                     aLineInfo.SetStyle( LINE_DASH );
                     aLineInfo.SetDashCount( 0 );
-                    aLineInfo.SetDotCount( 1 );
-                    aLineInfo.SetDotLen( 30 );
-                    aLineInfo.SetDistance( 50 );
                 break;
                 case PS_DASH :
                     aLineInfo.SetStyle( LINE_DASH );
                     aLineInfo.SetDashCount( 1 );
                     aLineInfo.SetDotCount( 0 );
-                    aLineInfo.SetDashLen( 225 );
-                    aLineInfo.SetDistance( 100 );
                 break;
                 case PS_NULL :
                     bTransparent = true;