SkDiscardableMemory::Factory class

src/lazy/SkDiscardablePixelRef.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 "SkDiscardablePixelRef.h"
 #include "SkDiscardableMemory.h"
 
-SkDiscardablePixelRef::SkDiscardablePixelRef(SkImageGenerator* generator,
+#if LAZY_CACHE_STATS
+#include "SkThread.h"
+
+int32_t SkDiscardablePixelRef::gCacheHits;
+int32_t SkDiscardablePixelRef::gCacheMisses;
+#endif  // LAZY_CACHE_STATS
+
+typedef SkDiscardableMemory::Factory DMFactory;
+
+SkDiscardablePixelRef::SkDiscardablePixelRef(DMFactory* factory,
+                                             SkImageGenerator* generator,
                                              const SkImageInfo& info,
                                              size_t size,
                                              size_t rowBytes)
-    : fGenerator(generator)
+    : fDMFactory(factory)
+    , fGenerator(generator)
     , fInfo(info)
     , fSize(size)
     , fRowBytes(rowBytes)
     , fDiscardableMemory(NULL) {
     SkASSERT(fGenerator != NULL);
     SkASSERT(fSize > 0);
     SkASSERT(fRowBytes > 0);
+    SkSafeRef(fDMFactory);
 }
 
 SkDiscardablePixelRef::~SkDiscardablePixelRef() {
+    SkDELETE(fDiscardableMemory);
     SkDELETE(fGenerator);
+    SkSafeUnref(fDMFactory);
 }
 
-void* SkDiscardablePixelRef::onLockPixels(SkColorTable**) {
+void* SkDiscardablePixelRef::onLockPixels(SkColorTable** colorTable) {
+    (void)colorTable;
     if (fDiscardableMemory != NULL) {
         if (fDiscardableMemory->lock()) {
+            #if LAZY_CACHE_STATS
+            sk_atomic_inc(&gCacheHits);
+            #endif
             return fDiscardableMemory->data();
         }
+        #if LAZY_CACHE_STATS
+        sk_atomic_inc(&gCacheMisses);
+        #endif
+        SkDELETE(fDiscardableMemory);
         fDiscardableMemory = NULL;
     }
-    fDiscardableMemory = SkDiscardableMemory::Create(fSize);
+    SkASSERT(NULL == fDiscardableMemory);
+    if (fDMFactory != NULL) {
+        fDiscardableMemory = fDMFactory->create(fSize);
+    } else {
+        fDiscardableMemory = SkDiscardableMemory::Create(fSize);
+    }
     if (NULL == fDiscardableMemory) {
         return NULL;  // Memory allocation failed.
     }
     void* pixels = fDiscardableMemory->data();
     if (!fGenerator->getPixels(fInfo, pixels, fRowBytes)) {
         return NULL;  // TODO(halcanary) Find out correct thing to do.
     }
     return pixels;
 }
 void SkDiscardablePixelRef::onUnlockPixels() {
     if (fDiscardableMemory != NULL) {
         fDiscardableMemory->unlock();
     }
 }
 
 bool SkDiscardablePixelRef::Install(SkImageGenerator* generator,
-                                    SkBitmap* dst) {
+                                    SkBitmap* dst,
+                                    DMFactory* factory) {
     SkImageInfo info;
     SkASSERT(generator != NULL);
     if ((NULL == generator)
         || (!generator->getInfo(&info))
-        || (!dst->setConfig(info, 0))) {
+        || (!dst->setConfig(info, 0))
+        || (0 == dst->getSize())) {
         SkDELETE(generator);
         return false;
     }
     SkAutoTUnref<SkDiscardablePixelRef> ref(SkNEW_ARGS(SkDiscardablePixelRef,
-                                                   (generator, info,
-                                                    dst->getSize(),
-                                                    dst->rowBytes())));
+                                                       (factory, generator,
+                                                        info, dst->getSize(),
+                                                        dst->rowBytes())));
     dst->setPixelRef(ref);
     return true;
 }