diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/effects/SkDiscretePathEffect.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/src/effects/SkDiscretePathEffect.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,83 @@
+
+/*
+ * Copyright 2006 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "SkDiscretePathEffect.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
+#include "SkPathMeasure.h"
+#include "SkRandom.h"
+
+static void Perterb(SkPoint* p, const SkVector& tangent, SkScalar scale) {
+    SkVector normal = tangent;
+    normal.rotateCCW();
+    normal.setLength(scale);
+    *p += normal;
+}
+
+
+SkDiscretePathEffect::SkDiscretePathEffect(SkScalar segLength, SkScalar deviation)
+    : fSegLength(segLength), fPerterb(deviation)
+{
+}
+
+bool SkDiscretePathEffect::filterPath(SkPath* dst, const SkPath& src,
+                                      SkStrokeRec* rec, const SkRect*) const {
+    bool doFill = rec->isFillStyle();
+
+    SkPathMeasure   meas(src, doFill);
+    uint32_t        seed = SkScalarRoundToInt(meas.getLength());
+    SkLCGRandom     rand(seed ^ ((seed << 16) | (seed >> 16)));
+    SkScalar        scale = fPerterb;
+    SkPoint         p;
+    SkVector        v;
+
+    do {
+        SkScalar    length = meas.getLength();
+
+        if (fSegLength * (2 + doFill) > length) {
+            meas.getSegment(0, length, dst, true);  // to short for us to mangle
+        } else {
+            int         n = SkScalarRoundToInt(length / fSegLength);
+            SkScalar    delta = length / n;
+            SkScalar    distance = 0;
+
+            if (meas.isClosed()) {
+                n -= 1;
+                distance += delta/2;
+            }
+
+            if (meas.getPosTan(distance, &p, &v)) {
+                Perterb(&p, v, SkScalarMul(rand.nextSScalar1(), scale));
+                dst->moveTo(p);
+            }
+            while (--n >= 0) {
+                distance += delta;
+                if (meas.getPosTan(distance, &p, &v)) {
+                    Perterb(&p, v, SkScalarMul(rand.nextSScalar1(), scale));
+                    dst->lineTo(p);
+                }
+            }
+            if (meas.isClosed()) {
+                dst->close();
+            }
+        }
+    } while (meas.nextContour());
+    return true;
+}
+
+void SkDiscretePathEffect::flatten(SkWriteBuffer& buffer) const {
+    this->INHERITED::flatten(buffer);
+    buffer.writeScalar(fSegLength);
+    buffer.writeScalar(fPerterb);
+}
+
+SkDiscretePathEffect::SkDiscretePathEffect(SkReadBuffer& buffer) {
+    fSegLength = buffer.readScalar();
+    fPerterb = buffer.readScalar();
+}