Implement vertex buffer caching in the tessellated path renderer.

include/core/SkPathRef.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPathRef_DEFINED
 #define SkPathRef_DEFINED
@@ skipping 162 matching lines @@
 
     static SkPathRef* CreateFromBuffer(SkRBuffer* buffer);
 
     /**
      * Rollsback a path ref to zero verbs and points with the assumption that the path ref will be
      * repopulated with approximately the same number of verbs and points. A new path ref is created
      * only if necessary.
      */
     static void Rewind(SkAutoTUnref<SkPathRef>* pathRef);
 
-    virtual ~SkPathRef() {
-        SkDEBUGCODE(this->validate();)
-        sk_free(fPoints);
-
-        SkDEBUGCODE(fPoints = NULL;)
-        SkDEBUGCODE(fVerbs = NULL;)
-        SkDEBUGCODE(fVerbCnt = 0x9999999;)
-        SkDEBUGCODE(fPointCnt = 0xAAAAAAA;)
-        SkDEBUGCODE(fPointCnt = 0xBBBBBBB;)
-        SkDEBUGCODE(fGenerationID = 0xEEEEEEEE;)
-        SkDEBUGCODE(fEditorsAttached = 0x7777777;)
-    }
-
+    virtual ~SkPathRef();
     int countPoints() const { SkDEBUGCODE(this->validate();) return fPointCnt; }
     int countVerbs() const { SkDEBUGCODE(this->validate();) return fVerbCnt; }
     int countWeights() const { SkDEBUGCODE(this->validate();) return fConicWeights.count(); }
 
     /**
      * Returns a pointer one beyond the first logical verb (last verb in memory order).
      */
     const uint8_t* verbs() const { SkDEBUGCODE(this->validate();) return fVerbs; }
 
     /**
@@ skipping 38 matching lines @@
      */
     uint32_t writeSize() const;
 
     /**
      * Gets an ID that uniquely identifies the contents of the path ref. If two path refs have the
      * same ID then they have the same verbs and points. However, two path refs may have the same
      * contents but different genIDs.
      */
     uint32_t genID() const;
 
+    struct GenIDChangeListener {
+        virtual ~GenIDChangeListener() {}
+        virtual void onChange() = 0;
+    };
+
+    void addGenIDChangeListener(GenIDChangeListener* listener);
+    void removeGenIDChangeListener(GenIDChangeListener* listener);

[reed1, 2015/07/28 21:02:55]

are there any callers for remove? we don't offer this on pixelref, so I was
surprised to see it here.

+
     SkDEBUGCODE(void validate() const;)
 
 private:
     enum SerializationOffsets {
         kIsFinite_SerializationShift = 25,  // requires 1 bit
         kIsOval_SerializationShift = 24,    // requires 1 bit
         kSegmentMask_SerializationShift = 0 // requires 4 bits
     };
 
     SkPathRef() {
@@ skipping 157 matching lines @@
     friend SkPathRef* sk_create_empty_pathref();
 
     void setIsOval(bool isOval) { fIsOval = isOval; }
 
     SkPoint* getPoints() {
         SkDEBUGCODE(this->validate();)
         fIsOval = false;
         return fPoints;
     }
 
+    void callGenIDChangeListeners();
+
     enum {
         kMinSize = 256,
     };
 
     mutable SkRect   fBounds;
     mutable uint8_t  fBoundsIsDirty;
     mutable SkBool8  fIsFinite;    // only meaningful if bounds are valid
 
     SkBool8  fIsOval;
     uint8_t  fSegmentMask;
 
     SkPoint*            fPoints; // points to begining of the allocation
     uint8_t*            fVerbs; // points just past the end of the allocation (verbs grow backwards)
     int                 fVerbCnt;
     int                 fPointCnt;
     size_t              fFreeSpace; // redundant but saves computation
     SkTDArray<SkScalar> fConicWeights;
 
     enum {
         kEmptyGenID = 1, // GenID reserved for path ref with zero points and zero verbs.
     };
     mutable uint32_t    fGenerationID;
     SkDEBUGCODE(int32_t fEditorsAttached;) // assert that only one editor in use at any time.
 
+    SkTDArray<GenIDChangeListener*> fGenIDChangeListeners;  // pointers are owned
+
     friend class PathRefTest_Private;
     typedef SkRefCnt INHERITED;
 };
 
 #endif