path ops : make it real

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 "SkBounder.h"
 #include "SkDevice.h"
 #include "SkDeviceImageFilterProxy.h"
 #include "SkDraw.h"
 #include "SkDrawFilter.h"
 #include "SkDrawLooper.h"
 #include "SkMetaData.h"
+#include "SkPathOps.h"
 #include "SkPicture.h"
 #include "SkRasterClip.h"
 #include "SkRRect.h"
 #include "SkScalarCompare.h"
 #include "SkSurface_Base.h"
 #include "SkTemplates.h"
 #include "SkTextFormatParams.h"
 #include "SkTLazy.h"
 #include "SkUtils.h"
 
@@ skipping 473 matching lines @@
 
 #define LOOPER_END    }
 
 ////////////////////////////////////////////////////////////////////////////
 
 SkDevice* SkCanvas::init(SkDevice* device) {
     fBounder = NULL;
     fLocalBoundsCompareType.setEmpty();
     fLocalBoundsCompareTypeDirty = true;
     fAllowSoftClip = true;
+    fAllowSimplifyClip = false;
     fDeviceCMDirty = false;
     fSaveLayerCount = 0;
     fMetaData = NULL;
 
     fMCRec = (MCRec*)fMCStack.push_back();
     new (fMCRec) MCRec(NULL, 0);
 
     fMCRec->fLayer = SkNEW_ARGS(DeviceCM, (NULL, 0, 0, NULL, NULL));
     fMCRec->fTopLayer = fMCRec->fLayer;
     fMCRec->fNext = NULL;
@@ skipping 713 matching lines @@
     // bounds to empty if that is the case. (see SkRect::set(pts, count))
     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, doAA);
 
+    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();
+            if (type == SkClipStack::Element::kEmpty_Type) {
+                continue;
+            }
+            SkPath operand;
+            if (type == SkClipStack::Element::kRect_Type) {
+                operand.addRect(element->getRect());
+            } else if (type == SkClipStack::Element::kPath_Type) {
+                operand = element->getPath();
+            } else {
+                SkDEBUGFAIL("Unexpected type.");
+            }
+            SkRegion::Op elementOp = element->getOp();
+            if (elementOp == SkRegion::kReplace_Op) {
+                devPath = operand;
+            } else {
+                Op(devPath, operand, (SkPathOp) elementOp, &devPath);
+            }
+        }
+        op = SkRegion::kReplace_Op;
+    }
+
     return clipPathHelper(this, fMCRec->fRasterClip, devPath, op, doAA);
 }
 
 bool SkCanvas::clipRegion(const SkRegion& rgn, SkRegion::Op op) {
     AutoValidateClip avc(this);
 
     fDeviceCMDirty = true;
     fLocalBoundsCompareTypeDirty = true;
 
     // todo: signal fClipStack that we have a region, and therefore (I guess)
@@ skipping 874 matching lines @@
     return *paint;
 }
 
 const SkRegion& SkCanvas::LayerIter::clip() const { return fImpl->getClip(); }
 int SkCanvas::LayerIter::x() const { return fImpl->getX(); }
 int SkCanvas::LayerIter::y() const { return fImpl->getY(); }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkCanvas::ClipVisitor::~ClipVisitor() { }