fix some pathops bugs found in 1M skps

src/pathops/SkPathOpsDebug.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPathOpsDebug_DEFINED
 #define SkPathOpsDebug_DEFINED
 
 #include "SkPathOps.h"
@@ skipping 25 matching lines @@
 #define WIND_AS_STRING(x) char x##Str[12]; \
         if (!SkPathOpsDebug::ValidWind(x)) strcpy(x##Str, "?"); \
         else SK_SNPRINTF(x##Str, sizeof(x##Str), "%d", x)
 
 #if FORCE_RELEASE
 
 #define DEBUG_ACTIVE_OP 0
 #define DEBUG_ACTIVE_SPANS 0
 #define DEBUG_ADD_INTERSECTING_TS 0
 #define DEBUG_ADD_T 0
+#define DEBUG_ALIGNMENT 0
 #define DEBUG_ANGLE 0
 #define DEBUG_ASSEMBLE 0
+#define DEBUG_COINCIDENCE 0
 #define DEBUG_CUBIC_BINARY_SEARCH 0
 #define DEBUG_CUBIC_SPLIT 0
 #define DEBUG_DUMP_SEGMENTS 0
 #define DEBUG_FLOW 0
 #define DEBUG_LIMIT_WIND_SUM 0
 #define DEBUG_MARK_DONE 0
 #define DEBUG_PATH_CONSTRUCTION 0
 #define DEBUG_PERP 0
 #define DEBUG_SHOW_TEST_NAME 0
 #define DEBUG_SORT 0
 #define DEBUG_T_SECT 0
 #define DEBUG_T_SECT_DUMP 0
+#define DEBUG_T_SECT_LOOP_COUNT 0
 #define DEBUG_VALIDATE 0
 #define DEBUG_WINDING 0
 #define DEBUG_WINDING_AT_T 0
 
+
 #else
 
 #define DEBUG_ACTIVE_OP 1
 #define DEBUG_ACTIVE_SPANS 1
 #define DEBUG_ADD_INTERSECTING_TS 1
 #define DEBUG_ADD_T 1
+#define DEBUG_ALIGNMENT 0
 #define DEBUG_ANGLE 1
 #define DEBUG_ASSEMBLE 1
+#define DEBUG_COINCIDENCE 1
 #define DEBUG_CUBIC_BINARY_SEARCH 0
 #define DEBUG_CUBIC_SPLIT 1
 #define DEBUG_DUMP_SEGMENTS 1
 #define DEBUG_FLOW 1
 #define DEBUG_LIMIT_WIND_SUM 5
 #define DEBUG_MARK_DONE 1
 #define DEBUG_PATH_CONSTRUCTION 1
 #define DEBUG_PERP 1
 #define DEBUG_SHOW_TEST_NAME 1
 #define DEBUG_SORT 1
-#define DEBUG_T_SECT 0
-#define DEBUG_T_SECT_DUMP 0
+#define DEBUG_T_SECT 1
+#define DEBUG_T_SECT_DUMP 1
+#define DEBUG_T_SECT_LOOP_COUNT 1
 #define DEBUG_VALIDATE 1
 #define DEBUG_WINDING 1
 #define DEBUG_WINDING_AT_T 1
 
 #endif
 
 #ifdef SK_RELEASE
     #define SkDEBUGRELEASE(a, b) b
     #define SkDEBUGPARAMS(...)
     #define SkDEBUGCODE_(...)
@@ skipping 16 matching lines @@
 #else
     #define PATH_OPS_DEBUG_T_SECT_RELEASE(a, b) a
     #define PATH_OPS_DEBUG_T_SECT_PARAMS(...) , __VA_ARGS__
     #define PATH_OPS_DEBUG_T_SECT_CODE(...) __VA_ARGS__
 #endif
 
 #if DEBUG_T_SECT_DUMP > 1
     extern int gDumpTSectNum;
 #endif
 
+#if DEBUG_COINCIDENCE
+    #define DEBUG_COINCIDENCE_HEALTH(contourList, id) \
+            SkPathOpsDebug::CheckHealth(contourList, id)
+#else
+    #define DEBUG_COINCIDENCE_HEALTH(contourList, id)
+#endif
+
 #define CUBIC_DEBUG_STR  "{{{%1.9g,%1.9g}, {%1.9g,%1.9g}, {%1.9g,%1.9g}, {%1.9g,%1.9g}}}"
 #define CONIC_DEBUG_STR "{{{{%1.9g,%1.9g}, {%1.9g,%1.9g}, {%1.9g,%1.9g}}}, %1.9g}"
 #define QUAD_DEBUG_STR   "{{{%1.9g,%1.9g}, {%1.9g,%1.9g}, {%1.9g,%1.9g}}}"
 #define LINE_DEBUG_STR   "{{{%1.9g,%1.9g}, {%1.9g,%1.9g}}}"
 #define PT_DEBUG_STR "{{%1.9g,%1.9g}}"
 
 #define T_DEBUG_STR(t, n) #t "[" #n "]=%1.9g"
 #define TX_DEBUG_STR(t) #t "[%d]=%1.9g"
 #define CUBIC_DEBUG_DATA(c) c[0].fX, c[0].fY, c[1].fX, c[1].fY, c[2].fX, c[2].fY, c[3].fX, c[3].fY
 #define CONIC_DEBUG_DATA(c, w) c[0].fX, c[0].fY, c[1].fX, c[1].fY, c[2].fX, c[2].fY, w
 #define QUAD_DEBUG_DATA(q)  q[0].fX, q[0].fY, q[1].fX, q[1].fY, q[2].fX, q[2].fY
 #define LINE_DEBUG_DATA(l)  l[0].fX, l[0].fY, l[1].fX, l[1].fY
 #define PT_DEBUG_DATA(i, n) i.pt(n).asSkPoint().fX, i.pt(n).asSkPoint().fY
 
 #ifndef DEBUG_TEST
 #define DEBUG_TEST 0
 #endif
 
 #if DEBUG_SHOW_TEST_NAME
 #include "SkTLS.h"
 #endif
 
 class SkPathOpsDebug {
 public:
     static const char* kLVerbStr[];
+    struct GlitchLog;
 
 #if defined(SK_DEBUG) || !FORCE_RELEASE
     static int gContourID;
     static int gSegmentID;
 #endif
 
 #if DEBUG_SORT
     static int gSortCountDefault;
     static int gSortCount;
 #endif
 
 #if DEBUG_ACTIVE_OP
     static const char* kPathOpStr[];
 #endif
 
+    static void CoincidentHealth(class SkOpContourHead* contourList, const char* id);
     static void MathematicaIze(char* str, size_t bufferSize);
     static bool ValidWind(int winding);
     static void WindingPrintf(int winding);
 
 #if DEBUG_SHOW_TEST_NAME
     static void* CreateNameStr();
     static void DeleteNameStr(void* v);
 #define DEBUG_FILENAME_STRING_LENGTH 64
 #define DEBUG_FILENAME_STRING (reinterpret_cast<char* >(SkTLS::Get(SkPathOpsDebug::CreateNameStr, \
         SkPathOpsDebug::DeleteNameStr)))
     static void BumpTestName(char* );
 #endif
     static const char* OpStr(SkPathOp );
     static void ShowOnePath(const SkPath& path, const char* name, bool includeDeclaration);
     static void ShowPath(const SkPath& one, const SkPath& two, SkPathOp op, const char* name);
 
     static bool ChaseContains(const SkTDArray<class SkOpSpanBase*>& , const class SkOpSpanBase* );
 
+    static void CheckHealth(class SkOpContourHead* contourList, const char* id);
+
     static const struct SkOpAngle* DebugAngleAngle(const struct SkOpAngle*, int id);
     static class SkOpContour* DebugAngleContour(struct SkOpAngle*, int id);
     static const class SkOpPtT* DebugAnglePtT(const struct SkOpAngle*, int id);
     static const class SkOpSegment* DebugAngleSegment(const struct SkOpAngle*, int id);
     static const class SkOpSpanBase* DebugAngleSpan(const struct SkOpAngle*, int id);
 
     static const struct SkOpAngle* DebugContourAngle(class SkOpContour*, int id);
     static class SkOpContour* DebugContourContour(class SkOpContour*, int id);
     static const class SkOpPtT* DebugContourPtT(class SkOpContour*, int id);
     static const class SkOpSegment* DebugContourSegment(class SkOpContour*, int id);
@@ skipping 24 matching lines @@
     static const class SkOpSpanBase* DebugSpanSpan(const class SkOpSpanBase*, int id);
 };
 
 struct SkDQuad;
 
 // generates tools/path_sorter.htm and path_visualizer.htm compatible data
 void DumpQ(const SkDQuad& quad1, const SkDQuad& quad2, int testNo);
 void DumpT(const SkDQuad& quad, double t);
 
 #endif