tdf#31814 EMF+ Fix an issue when not all elements were displayed

On on EMF+ images generated by ChemDraw, some elements were not displayed.
After investigation, occurs that position of points was not read
properly in same cases. This commit fixes such cases.

Change-Id: I1d01d8defc41f4e437a669ef1268b8e33823cfc1
Reviewed-on: https://gerrit.libreoffice.org/37406
Reviewed-by: Bartosz Kosiorek <gang65@poczta.onet.pl>
Tested-by: Bartosz Kosiorek <gang65@poczta.onet.pl>

2 files changed, 15 insertions, 8 deletions

diff --git a/cppcanvas/source/mtfrenderer/emfplus.cxx b/cppcanvas/source/mtfrenderer/emfplus.cxx
index 4d4bfb528d61..9db632d19413 100644
--- a/cppcanvas/source/mtfrenderer/emfplus.cxx
+++ b/cppcanvas/source/mtfrenderer/emfplus.cxx
@@ -233,6 +233,12 @@ namespace cppcanvas
 
         void ImplRenderer::ReadPoint (SvStream& s, float& x, float& y, sal_uInt32 flags)
         {
+            if (flags & 0x800) {
+                // specifies a location in the coordinate space that is relative to
+                // the location specified by the previous element in the array. In the case of the first element in
+                // PointData, a previous location at coordinates (0,0) is assumed.
+                SAL_WARN("cppcanvas.emf", "EMF+\t\t TODO Relative coordinates bit detected. Implement parse EMFPlusPointR");
+            }
             if (flags & 0x4000) {
                 sal_Int16 ix, iy;
 
diff --git a/cppcanvas/source/mtfrenderer/emfppath.cxx b/cppcanvas/source/mtfrenderer/emfppath.cxx
index 034e6419ccd7..d924ce61d816 100644
--- a/cppcanvas/source/mtfrenderer/emfppath.cxx
+++ b/cppcanvas/source/mtfrenderer/emfppath.cxx
@@ -67,22 +67,23 @@ namespace cppcanvas
         void EMFPPath::Read (SvStream& s, sal_uInt32 pathFlags, ImplRenderer& rR)
         {
             for (int i = 0; i < nPoints; i ++) {
-                if (pathFlags & 0x4000) {
+                if (pathFlags & 0x800) {
+                    // EMFPlusPointR: points are stored in EMFPlusInteger7 or
+                    // EMFPlusInteger15 objects, see section 2.2.2.21/22
+                    // If 0x800 bit is set, the 0x4000 bit is undefined and must be ignored
+                    SAL_WARN("cppcanvas.emf", "EMF+\t\t TODO - parse EMFPlusPointR object (section 2.2.1.6)");
+                } else if (pathFlags & 0x4000) {
                     // EMFPlusPoint: stored in signed short 16bit integer format
                     sal_Int16 x, y;
 
                     s.ReadInt16( x ).ReadInt16( y );
-                    SAL_INFO ("cppcanvas.emf", "EMF+\tEMFPlusPoint [x,y]: " << x << "," << y);
+                    SAL_INFO ("cppcanvas.emf", "EMF+\t EMFPlusPoint [x,y]: " << x << "," << y);
                     pPoints [i*2] = x;
                     pPoints [i*2 + 1] = y;
-                } else if (!(pathFlags & 0xC000)) {
+                } else {
                     // EMFPlusPointF: stored in Single (float) format
                     s.ReadFloat( pPoints [i*2] ).ReadFloat( pPoints [i*2 + 1] );
-                    SAL_INFO ("cppcanvas.emf", "EMF+\tEMFPlusPointF [x,y]: " << pPoints [i*2] << "," << pPoints [i*2 + 1]);
-                } else { //if (pathFlags & 0x8000)
-                    // EMFPlusPointR: points are stored in EMFPlusInteger7 or
-                    // EMFPlusInteger15 objects, see section 2.2.2.21/22
-                    SAL_INFO("cppcanvas.emf", "EMF+\t\tTODO - parse EMFPlusPointR object (section 2.2.1.6)");
+                    SAL_INFO ("cppcanvas.emf", "EMF+\t EMFPlusPointF [x,y]: " << pPoints [i*2] << "," << pPoints [i*2 + 1]);
                 }
 
             }