Set temporary paths volatile so we don't cache them.

include/core/SkPath.h

 
 /*
  * 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.
  */
 
 
 #ifndef SkPath_DEFINED
@@ skipping 167 matching lines @@
 
     /**
      *  Returns true if all of the points in this path are finite, meaning there
      *  are no infinities and no NaNs.
      */
     bool isFinite() const {
         SkDEBUGCODE(this->validate();)
         return fPathRef->isFinite();
     }
 
+    /** Returns true if the path is volatile (i.e. should not be cached by devices.)
+     */
+    bool isVolatile() const {
+        return SkToBool(fIsVolatile);
+    }
+
+    /** Specify whether this path is volatile. Paths are not volatile by
+     default. Temporary paths that are discarded or modified after use should be
+     marked as volatile. This provides a hint to the device that the path
+     should not be cached. Providing this hint when appropriate can
+     improve performance by avoiding unnecessary overhead and resource
+     consumption on the device.
+     */
+    void setIsVolatile(bool isVolatile) {
+        fIsVolatile = isVolatile;
+    }
+
     /** Test a line for zero length
 
         @return true if the line is of zero length; otherwise false.
     */
     static bool IsLineDegenerate(const SkPoint& p1, const SkPoint& p2) {
         return p1.equalsWithinTolerance(p2);
     }
 
     /** Test a quad for zero length
 
@@ skipping 766 matching lines @@
     static const int kPathRefGenIDBitCnt = 32;
 #endif
 
     SkDEBUGCODE(void validate() const;)
 
 private:
     enum SerializationOffsets {
         // 1 free bit at 29
         kUnused1_SerializationShift = 28,    // 1 free bit
         kDirection_SerializationShift = 26, // requires 2 bits
-        kUnused2_SerializationShift = 25,    // 1 free bit
+        kIsVolatile_SerializationShift = 25, // requires 1 bit
         // 1 free bit at 24
         kConvexity_SerializationShift = 16, // requires 8 bits
         kFillType_SerializationShift = 8,   // requires 8 bits
         // 8 free bits at 0
     };
 
     SkAutoTUnref<SkPathRef> fPathRef;
 
     int                 fLastMoveToIndex;
     uint8_t             fFillType;
     mutable uint8_t     fConvexity;
     mutable uint8_t     fDirection;
+    mutable SkBool8     fIsVolatile;
 #ifdef SK_BUILD_FOR_ANDROID
     const SkPath*       fSourcePath;
 #endif
 
     /** Resets all fields other than fPathRef to their initial 'empty' values.
      *  Assumes the caller has already emptied fPathRef.
      *  On Android increments fGenerationID without reseting it.
      */
     void resetFields();
 
@@ skipping 45 matching lines @@
     }
 
     friend class SkAutoPathBoundsUpdate;
     friend class SkAutoDisableOvalCheck;
     friend class SkAutoDisableDirectionCheck;
     friend class SkBench_AddPathTest; // perf test reversePathTo
     friend class PathTest_Private; // unit test reversePathTo
 };
 
 #endif