1 files changed, 57 insertions, 0 deletions
diff --git a/gfx/2d/PathAnalysis.h b/gfx/2d/PathAnalysis.h
new file mode 100644
index 000000000..5a38ed161
--- /dev/null
+++ b/gfx/2d/PathAnalysis.h
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "2D.h"
+#include <vector>
+
+namespace mozilla {
+namespace gfx {
+
+struct FlatPathOp
+{
+  enum OpType {
+    OP_MOVETO,
+    OP_LINETO,
+  };
+
+  OpType mType;
+  Point mPoint;
+};
+
+class FlattenedPath : public PathSink
+{
+public:
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(FlattenedPath)
+  FlattenedPath() : mCachedLength(0)
+                  , mCalculatedLength(false)
+  {
+  }
+
+  virtual void MoveTo(const Point &aPoint);
+  virtual void LineTo(const Point &aPoint);
+  virtual void BezierTo(const Point &aCP1,
+                        const Point &aCP2,
+                        const Point &aCP3);
+  virtual void QuadraticBezierTo(const Point &aCP1,
+                                 const Point &aCP2);
+  virtual void Close();
+  virtual void Arc(const Point &aOrigin, float aRadius, float aStartAngle,
+                   float aEndAngle, bool aAntiClockwise = false);
+
+  virtual Point CurrentPoint() const { return mPathOps.empty() ? Point() : mPathOps[mPathOps.size() - 1].mPoint; }
+
+  Float ComputeLength();
+  Point ComputePointAtLength(Float aLength, Point *aTangent);
+
+private:
+  Float mCachedLength;
+  bool mCalculatedLength;
+  Point mLastMove;
+
+  std::vector<FlatPathOp> mPathOps;
+};
+
+} // namespace gfx
+} // namespace mozilla