1 files changed, 157 insertions, 0 deletions
diff --git a/src/effects/SkCornerPathEffect.cpp b/src/effects/SkCornerPathEffect.cpp
new file mode 100644
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--- /dev/null
+++ b/src/effects/SkCornerPathEffect.cpp
@@ -0,0 +1,157 @@
+/* libs/graphics/effects/SkCornerPathEffect.cpp
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#include "SkCornerPathEffect.h"
+#include "SkPath.h"
+#include "SkPoint.h"
+#include "SkBuffer.h"
+
+SkCornerPathEffect::SkCornerPathEffect(SkScalar radius) : fRadius(radius)
+{
+}
+
+SkCornerPathEffect::~SkCornerPathEffect()
+{
+}
+
+static bool ComputeStep(const SkPoint& a, const SkPoint& b, SkScalar radius, SkPoint* step)
+{
+    SkScalar dist = SkPoint::Distance(a, b);
+
+    step->set(b.fX - a.fX, b.fY - a.fY);
+    
+    if (dist <= radius * 2) {
+        step->scale(SK_ScalarHalf);
+        return false;
+    }
+    else {
+        step->scale(SkScalarDiv(radius, dist));
+        return true;
+    }
+}
+
+bool SkCornerPathEffect::filterPath(SkPath* dst, const SkPath& src, SkScalar* width)
+{
+    if (fRadius == 0)
+        return false;
+
+    SkPath::Iter    iter(src, false);
+    SkPath::Verb    verb, prevVerb = (SkPath::Verb)-1;
+    SkPoint         pts[4];
+
+    bool        closed;
+    SkPoint     moveTo, lastCorner;
+    SkVector    firstStep, step;
+    bool        prevIsValid = true;
+
+    // to avoid warnings
+    moveTo.set(0, 0);
+    firstStep.set(0, 0);
+    lastCorner.set(0, 0);
+
+    for (;;) {
+        switch (verb = iter.next(pts)) {
+        case SkPath::kMove_Verb:
+            closed = iter.isClosedContour();
+            if (closed) {
+                moveTo = pts[0];
+                prevIsValid = false;
+            }
+            else {
+                dst->moveTo(pts[0]);
+                prevIsValid = true;
+            }
+            break;
+        case SkPath::kLine_Verb:
+            {
+                bool drawSegment = ComputeStep(pts[0], pts[1], fRadius, &step);
+                // prev corner
+                if (!prevIsValid) {
+                    dst->moveTo(moveTo + step);
+                    prevIsValid = true;
+                }
+                else {
+                    dst->quadTo(pts[0].fX, pts[0].fY, pts[0].fX + step.fX, pts[0].fY + step.fY);
+                }
+                if (drawSegment) {
+                    dst->lineTo(pts[1].fX - step.fX, pts[1].fY - step.fY);
+                }
+                lastCorner = pts[1];
+                prevIsValid = true;
+            }
+            break;
+        case SkPath::kQuad_Verb:
+            // TBD - just replicate the curve for now
+            if (!prevIsValid)
+            {
+                dst->moveTo(pts[0]);
+                prevIsValid = true;
+            }
+            dst->quadTo(pts[1], pts[2]);
+            lastCorner = pts[2];
+            firstStep.set(0, 0);
+            break;
+        case SkPath::kCubic_Verb:
+            if (!prevIsValid)
+            {
+                dst->moveTo(pts[0]);
+                prevIsValid = true;
+            }
+            // TBD - just replicate the curve for now
+            dst->cubicTo(pts[1], pts[2], pts[3]);
+            lastCorner = pts[3];
+            firstStep.set(0, 0);
+            break;
+        case SkPath::kClose_Verb:
+            if (firstStep.fX || firstStep.fY)
+                dst->quadTo(lastCorner.fX, lastCorner.fY,
+                            lastCorner.fX + firstStep.fX,
+                            lastCorner.fY + firstStep.fY);
+            dst->close();
+            break;
+        case SkPath::kDone_Verb:
+            goto DONE;
+        }
+
+        if (SkPath::kMove_Verb == prevVerb)
+            firstStep = step;
+        prevVerb = verb;
+    }
+DONE:
+    return true;
+}
+
+SkFlattenable::Factory SkCornerPathEffect::getFactory()
+{
+    return CreateProc;
+}
+
+void SkCornerPathEffect::flatten(SkFlattenableWriteBuffer& buffer)
+{
+    buffer.writeScalar(fRadius);
+}
+
+SkFlattenable* SkCornerPathEffect::CreateProc(SkFlattenableReadBuffer& buffer)
+{
+    return SkNEW_ARGS(SkCornerPathEffect, (buffer));
+}
+
+SkCornerPathEffect::SkCornerPathEffect(SkFlattenableReadBuffer& buffer)
+{
+    fRadius = buffer.readScalar();
+}
+