Reimplement gpu message bus for invalidated bitmap gen IDs

include/gpu/GrResourceKey.h

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrResourceKey_DEFINED
 #define GrResourceKey_DEFINED
@@ skipping 28 matching lines @@
         fKey[kHash_MetaDataIdx] = 0;
         fKey[kDomainAndSize_MetaDataIdx] = kInvalidDomain;
     }
 
     bool operator==(const GrResourceKey& that) const {
         SkASSERT(this->isValid() && that.isValid());
         return 0 == memcmp(fKey.get(), that.fKey.get(), this->size());
     }
 
     GrResourceKey& operator=(const GrResourceKey& that) {
+        SkASSERT(that.isValid());
         if (this != &that) {
             size_t bytes = that.size();
             SkASSERT(SkIsAlign4(bytes));
             fKey.reset(SkToInt(bytes / sizeof(uint32_t)));
             memcpy(fKey.get(), that.fKey.get(), bytes);
+            this->validate();
         }
         return *this;
     }
 
     bool isValid() const { return kInvalidDomain != this->domain(); }
 
     uint32_t domain() const { return fKey[kDomainAndSize_MetaDataIdx] & 0xffff; }
 
     /** size of the key data, excluding meta-data (hash, domain, etc).  */
     size_t dataSize() const { return this->size() - 4 * kMetaDataCnt; }
@@ skipping 165 matching lines @@
         }
 
     private:
         static int Data32CntForInnerKey(const GrContentKey& innerKey) {
             // key data + domain
             return SkToInt((innerKey.dataSize() >> 2) + 1);
         }
     };
 };
 
+// The cache listens for these messages to purge junk resources proactively.
+class GrContentKeyInvalidatedMessage {
+public:
+    explicit GrContentKeyInvalidatedMessage(const GrContentKey& key) : fKey(key) {}
+    GrContentKeyInvalidatedMessage(const GrContentKeyInvalidatedMessage& that) : fKey(that.fKey) {}
+    GrContentKeyInvalidatedMessage& operator=(const GrContentKeyInvalidatedMessage& that) {
+        fKey = that.fKey;
+        return *this;
+    }
+    const GrContentKey& key() const { return fKey; }
+private:
+    GrContentKey fKey;
+};
 #endif