skia: Added SkDiscardableMemory interface.

include/core/SkGraphics.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 SkGraphics_DEFINED
 #define SkGraphics_DEFINED
 
 #include "SkTypes.h"
 
+class SkDiscardableMemoryFactory;
+
 class SK_API SkGraphics {
 public:
     /**
      *  Call this at process initialization time if your environment does not
      *  permit static global initializers that execute code. Note that
      *  Init() is not thread-safe.
      */
     static void Init();
 
     /**
@@ skipping 32 matching lines @@
      *  For debugging purposes, this will attempt to purge the font cache. It
      *  does not change the limit, but will cause subsequent font measures and
      *  draws to be recreated, since they will no longer be in the cache.
      */
     static void PurgeFontCache();
 
     static size_t GetImageCacheBytesUsed();
     static size_t GetImageCacheByteLimit();
     static size_t SetImageCacheByteLimit(size_t newLimit);
 
+    static void SetSkDiscardableMemoryFactory(

[scroggo, 2013/08/15 14:06:06]

Once SetSkDiscardableMemoryFactory does something, will the SkGraphics take
ownership of the SkDiscardableMemoryFactory?

Looks like the implementation uses a singleton. Can you add a comment that
states that SkGraphics does not manage the factory's lifecycle?

[ernstm, 2013/08/15 20:26:37]

Replaced SkDiscardableMemoryFactory by a factory function.

+        SkDiscardableMemoryFactory* factory);
+
     /**
      *  Applications with command line options may pass optional state, such
      *  as cache sizes, here, for instance:
      *  font-cache-limit=12345678
      *
      *  The flags format is name=value[;name=value...] with no spaces.
      *  This format is subject to change.
      */
     static void SetFlags(const char* flags);
 
@@ skipping 29 matching lines @@
 public:
     SkAutoGraphics() {
         SkGraphics::Init();
     }
     ~SkAutoGraphics() {
         SkGraphics::Term();
     }
 };
 
 #endif