Add SkCachedData and use it for SkMipMap

src/core/SkResourceCache.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 "SkCachedData.h"
 #include "SkChecksum.h"
 #include "SkResourceCache.h"
 #include "SkMipMap.h"
 #include "SkPixelRef.h"
 
 // This can be defined by the caller's build system
 //#define SK_USE_DISCARDABLE_SCALEDIMAGECACHE
 
 #ifndef SK_DISCARDABLEMEMORY_SCALEDIMAGECACHE_COUNT_LIMIT
 #   define SK_DISCARDABLEMEMORY_SCALEDIMAGECACHE_COUNT_LIMIT   1024
@@ skipping 238 matching lines @@
 
 size_t SkResourceCache::setTotalByteLimit(size_t newLimit) {
     size_t prevLimit = fTotalByteLimit;
     fTotalByteLimit = newLimit;
     if (newLimit < prevLimit) {
         this->purgeAsNeeded();
     }
     return prevLimit;
 }
 
+SkCachedData* SkResourceCache::newCachedData(size_t bytes) {
+    if (fDiscardableFactory) {
+        SkDiscardableMemory* dm = fDiscardableFactory(bytes);
+        return dm ? SkNEW_ARGS(SkCachedData, (bytes, dm)) : NULL;
+    } else {
+        return SkNEW_ARGS(SkCachedData, (sk_malloc_throw(bytes), bytes));
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkResourceCache::detach(Rec* rec) {
     Rec* prev = rec->fPrev;
     Rec* next = rec->fNext;
 
     if (!prev) {
         SkASSERT(fHead == rec);
         fHead = next;
     } else {
@@ skipping 159 matching lines @@
 SkResourceCache::DiscardableFactory SkResourceCache::GetDiscardableFactory() {
     SkAutoMutexAcquire am(gMutex);
     return get_cache()->discardableFactory();
 }
 
 SkBitmap::Allocator* SkResourceCache::GetAllocator() {
     SkAutoMutexAcquire am(gMutex);
     return get_cache()->allocator();
 }
 
+SkCachedData* SkResourceCache::NewCachedData(size_t bytes) {
+    SkAutoMutexAcquire am(gMutex);
+    return get_cache()->newCachedData(bytes);
+}
+
 void SkResourceCache::Dump() {
     SkAutoMutexAcquire am(gMutex);
     get_cache()->dump();
 }
 
 size_t SkResourceCache::SetSingleAllocationByteLimit(size_t size) {
     SkAutoMutexAcquire am(gMutex);
     return get_cache()->setSingleAllocationByteLimit(size);
 }
 
@@ skipping 38 matching lines @@
 }
 
 size_t SkGraphics::SetResourceCacheSingleAllocationByteLimit(size_t newLimit) {
     return SkResourceCache::SetSingleAllocationByteLimit(newLimit);
 }
 
 void SkGraphics::PurgeResourceCache() {
     return SkResourceCache::PurgeAll();
 }