path ops : add support for inverse fill

src/pathops/SkPathOpsSimplify.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkAddIntersections.h"
 #include "SkOpEdgeBuilder.h"
 #include "SkPathOpsCommon.h"
 #include "SkPathWriter.h"
@@ skipping 131 matching lines @@
     return closable;
 }
 
 // FIXME : add this as a member of SkPath
 void Simplify(const SkPath& path, SkPath* result) {
 #if DEBUG_SORT || DEBUG_SWAP_TOP
     gDebugSortCount = gDebugSortCountDefault;
 #endif
     // returns 1 for evenodd, -1 for winding, regardless of inverse-ness
     result->reset();
-    result->setFillType(SkPath::kEvenOdd_FillType);
+    SkPath::FillType fillType = path.isInverseFillType() ? SkPath::kInverseEvenOdd_FillType
+            : SkPath::kEvenOdd_FillType;
+    result->setFillType(fillType);
     SkPathWriter simple(*result);
 
     // turn path into list of segments
     SkTArray<SkOpContour> contours;
     SkOpEdgeBuilder builder(path, contours);
     builder.finish();
     SkTDArray<SkOpContour*> contourList;
     MakeContourList(contours, contourList, false, false);
     SkOpContour** currentPtr = contourList.begin();
     if (!currentPtr) {
@@ skipping 17 matching lines @@
     FixOtherTIndex(&contourList);
     SortSegments(&contourList);
 #if DEBUG_ACTIVE_SPANS
     DebugShowActiveSpans(contourList);
 #endif
     // construct closed contours
     if (builder.xorMask() == kWinding_PathOpsMask ? bridgeWinding(contourList, &simple)
                 : !bridgeXor(contourList, &simple))
     {  // if some edges could not be resolved, assemble remaining fragments
         SkPath temp;
-        temp.setFillType(SkPath::kEvenOdd_FillType);
+        temp.setFillType(fillType);
         SkPathWriter assembled(temp);
         Assemble(simple, &assembled);
         *result = *assembled.nativePath();
     }
 }