diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/pathops/SkOpAngle.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/src/pathops/SkOpAngle.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkOpAngle_DEFINED
+#define SkOpAngle_DEFINED
+
+#include "SkLineParameters.h"
+#include "SkPath.h"
+#include "SkPathOpsCubic.h"
+
+class SkOpSegment;
+struct SkOpSpan;
+
+// sorting angles
+// given angles of {dx dy ddx ddy dddx dddy} sort them
+class SkOpAngle {
+public:
+    enum { kStackBasedCount = 8 }; // FIXME: determine what this should be
+    enum IncludeType {
+        kUnaryWinding,
+        kUnaryXor,
+        kBinarySingle,
+        kBinaryOpp,
+    };
+
+    bool operator<(const SkOpAngle& rh) const;
+
+    bool calcSlop(double x, double y, double rx, double ry, bool* result) const;
+
+    double dx() const {
+        return fTangentPart.dx();
+    }
+
+    double dy() const {
+        return fTangentPart.dy();
+    }
+
+    int end() const {
+        return fEnd;
+    }
+
+    bool isHorizontal() const;
+
+    SkOpSpan* lastMarked() const {
+        return fLastMarked;
+    }
+
+    void set(const SkOpSegment* segment, int start, int end);
+
+    void setLastMarked(SkOpSpan* marked) {
+        fLastMarked = marked;
+    }
+
+    SkOpSegment* segment() const {
+        return const_cast<SkOpSegment*>(fSegment);
+    }
+
+    int sign() const {
+        return SkSign32(fStart - fEnd);
+    }
+
+    int start() const {
+        return fStart;
+    }
+
+    bool unorderable() const {
+        return fUnorderable;
+    }
+
+    bool unsortable() const {
+        return fUnsortable;
+    }
+
+#ifdef SK_DEBUG
+    void dump() const;
+#endif
+
+#if DEBUG_ANGLE
+    void setID(int id) {
+        fID = id;
+    }
+#endif
+
+private:
+    bool lengthen(const SkOpAngle& );
+    void setSpans();
+
+    SkDCubic fCurvePart; // the curve from start to end
+    SkDCubic fCurveHalf; // the curve from start to 1 or 0
+    double fSide;
+    double fSide2;
+    SkLineParameters fTangentPart;
+    SkLineParameters fTangentHalf;
+    const SkOpSegment* fSegment;
+    SkOpSpan* fLastMarked;
+    int fStart;
+    int fEnd;
+    bool fComputed; // tangent is computed, may contain some error
+    // if subdividing a quad or cubic causes the tangent to go from the maximum angle to the
+    // minimum, mark it unorderable. It still can be sorted, which is good enough for find-top
+    // but can't be ordered, and therefore can't be used to compute winding
+    bool fUnorderable;
+    mutable bool fUnsortable;  // this alone is editable by the less than operator
+#if DEBUG_ANGLE
+    int fID;
+#endif
+};
+
+#endif