retool image cache to be generic cache

bench/ImageCacheBench.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Benchmark.h"
 #include "SkScaledImageCache.h"
 
 namespace {
 static void* gGlobalAddress;
 class TestKey : public SkScaledImageCache::Key {
 public:
     void*    fPtr;
     intptr_t fValue;
 
     TestKey(intptr_t value) : fPtr(&gGlobalAddress), fValue(value) {
         this->init(sizeof(fPtr) + sizeof(fValue));
     }
 };
+struct TestRec : public SkScaledImageCache::Rec {
+    TestKey     fKey;
+    intptr_t    fValue;
+
+    TestRec(const TestKey& key, intptr_t value) : fKey(key), fValue(value) {}
+
+    virtual const Key& getKey() const SK_OVERRIDE { return fKey; }
+    virtual size_t bytesUsed() const SK_OVERRIDE { return sizeof(fKey) + sizeof(fValue); }
+};
 }
 
 class ImageCacheBench : public Benchmark {
     SkScaledImageCache  fCache;
     SkBitmap            fBM;
 
     enum {
         DIM = 1,
         CACHE_COUNT = 500
     };
 public:
     ImageCacheBench()  : fCache(CACHE_COUNT * 100) {
         fBM.allocN32Pixels(DIM, DIM);
     }
 
     void populateCache() {
         for (int i = 0; i < CACHE_COUNT; ++i) {
-            TestKey key(i);
-            SkBitmap tmp;
-            tmp.allocN32Pixels(1, 1);
-            fCache.unlock(fCache.addAndLock(key, tmp));
+            fCache.unlock(fCache.addAndLock(SkNEW_ARGS(TestRec, (TestKey(i), i))));
         }
     }
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
         return "imagecache";
     }
 
     virtual void onDraw(const int loops, SkCanvas*) SK_OVERRIDE {
         if (fCache.getTotalBytesUsed() == 0) {
             this->populateCache();
         }
 
         TestKey key(-1);
-        SkBitmap tmp;
-        // search for a miss (-1 scale)
+        // search for a miss (-1)
         for (int i = 0; i < loops; ++i) {
-            SkDEBUGCODE(SkScaledImageCache::ID* id =) fCache.findAndLock(key, &tmp);
+            SkDEBUGCODE(SkScaledImageCache::ID id =) fCache.findAndLock(key);
             SkASSERT(NULL == id);
         }
     }
 
 private:
     typedef Benchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_BENCH( return new ImageCacheBench(); )