copy points in array that may stretch

src/pathops/SkOpSegment.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 "SkIntersections.h"
 #include "SkOpContour.h"
 #include "SkOpSegment.h"
 #include "SkPathWriter.h"
@@ skipping 233 matching lines @@
     // if the following span exists (not past the end, non-zero winding)
     // connect the two edges
     if (!fTs[tIndexStart].fWindValue) {
         if (tIndexStart > 0 && fTs[tIndexStart - 1].fWindValue) {
 #if DEBUG_CONCIDENT
             SkDebugf("%s 1 this=%d other=%d t [%d] %1.9g (%1.9g,%1.9g)\n",
                     __FUNCTION__, fID, other->fID, tIndexStart - 1,
                     fTs[tIndexStart].fT, xyAtT(tIndexStart).fX,
                     xyAtT(tIndexStart).fY);
 #endif
-            addTPair(fTs[tIndexStart].fT, other, other->fTs[oIndex].fT, false,
-                    fTs[tIndexStart].fPt);
+            SkPoint copy = fTs[tIndexStart].fPt;  // add t pair may move the point array
+            addTPair(fTs[tIndexStart].fT, other, other->fTs[oIndex].fT, false, copy);
         }
         if (nextT < 1 && fTs[tIndex].fWindValue) {
 #if DEBUG_CONCIDENT
             SkDebugf("%s 2 this=%d other=%d t [%d] %1.9g (%1.9g,%1.9g)\n",
                     __FUNCTION__, fID, other->fID, tIndex,
                     fTs[tIndex].fT, xyAtT(tIndex).fX,
                     xyAtT(tIndex).fY);
 #endif
-            addTPair(fTs[tIndex].fT, other, other->fTs[oIndexStart].fT, false, fTs[tIndex].fPt);
+            SkPoint copy = fTs[tIndex].fPt;  // add t pair may move the point array
+            addTPair(fTs[tIndex].fT, other, other->fTs[oIndexStart].fT, false, copy);
         }
     } else {
         SkASSERT(!other->fTs[oIndexStart].fWindValue);
         if (oIndexStart > 0 && other->fTs[oIndexStart - 1].fWindValue) {
 #if DEBUG_CONCIDENT
             SkDebugf("%s 3 this=%d other=%d t [%d] %1.9g (%1.9g,%1.9g)\n",
                     __FUNCTION__, fID, other->fID, oIndexStart - 1,
                     other->fTs[oIndexStart].fT, other->xyAtT(oIndexStart).fX,
                     other->xyAtT(oIndexStart).fY);
             other->debugAddTPair(other->fTs[oIndexStart].fT, *this, fTs[tIndex].fT);
@@ skipping 4117 matching lines @@
     SkASSERT(span->fWindValue > 0 || span->fOppValue != 0);
     span->fWindValue = 0;
     span->fOppValue = 0;
     if (span->fTiny || span->fSmall) {
         return;
     }
     SkASSERT(!span->fDone);
     span->fDone = true;
     ++fDoneSpans;
 }