[SkSVGDevice] Initial clipping support

src/core/SkCanvas.cpp

 /*
  * Copyright 2008 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 "SkCanvas.h"
 #include "SkCanvasDrawable.h"
 #include "SkCanvasPriv.h"
@@ skipping 1428 matching lines @@
     if (devPath.getBounds().isEmpty()) {
         // resetting the path will remove any NaN or other wanky values
         // that might upset our scan converter.
         devPath.reset();
     }
 
     // if we called path.swap() we could avoid a deep copy of this path
     fClipStack.clipDevPath(devPath, op, kSoft_ClipEdgeStyle == edgeStyle);
 
     if (fAllowSimplifyClip) {
-        devPath.reset();
-        devPath.setFillType(SkPath::kInverseEvenOdd_FillType);
-        const SkClipStack* clipStack = getClipStack();
-        SkClipStack::Iter iter(*clipStack, SkClipStack::Iter::kBottom_IterStart);
-        const SkClipStack::Element* element;
-        while ((element = iter.next())) {
-            SkClipStack::Element::Type type = element->getType();
-            SkPath operand;
-            if (type != SkClipStack::Element::kEmpty_Type) {
-                element->asPath(&operand);
-            }
-            SkRegion::Op elementOp = element->getOp();
-            if (elementOp == SkRegion::kReplace_Op) {
-                devPath = operand;
-            } else {
-                Op(devPath, operand, (SkPathOp) elementOp, &devPath);
-            }
-            // if the prev and curr clips disagree about aa -vs- not, favor the aa request.
-            // perhaps we need an API change to avoid this sort of mixed-signals about
-            // clipping.
-            if (element->isAA()) {
-                edgeStyle = kSoft_ClipEdgeStyle;
-            }
+        bool clipIsAA = getClipStack()->asPath(&devPath);
+        if (clipIsAA) {
+            edgeStyle = kSoft_ClipEdgeStyle;
         }
+
         op = SkRegion::kReplace_Op;
     }
 
     rasterclip_path(&fMCRec->fRasterClip, this, devPath, op, edgeStyle);
 }
 
 void SkCanvas::clipRegion(const SkRegion& rgn, SkRegion::Op op) {
     this->checkForDeferredSave();
     this->onClipRegion(rgn, op);
 }
@@ skipping 1093 matching lines @@
     }
 
     if (matrix) {
         canvas->concat(*matrix);
     }
 }
 
 SkAutoCanvasMatrixPaint::~SkAutoCanvasMatrixPaint() {
     fCanvas->restoreToCount(fSaveCount);
 }