Generalize to SkDescriptorMap

Change-Id: I4e7ff8093dbbe24cd5de4d4ea478716514d519f2
Reviewed-on: https://skia-review.googlesource.com/123041
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/core/SkStrikeCache.h b/src/core/SkStrikeCache.h
index cdaffb5688..d4dc13927c 100644
--- a/src/core/SkStrikeCache.h
+++ b/src/core/SkStrikeCache.h
@@ -8,6 +8,8 @@
 #ifndef SkStrikeCache_DEFINED
 #define SkStrikeCache_DEFINED
 
+#include <unordered_map>
+
 #include "SkDescriptor.h"
 #include "SkSpinlock.h"
 #include "SkTemplates.h"
@@ -29,6 +31,24 @@ class SkTraceMemoryDump;
 
 ///////////////////////////////////////////////////////////////////////////////
 
+struct SkDescriptorMapOperators {
+    size_t operator()(const SkDescriptor* key) const {
+        return key->getChecksum();
+    }
+
+    bool operator()(const SkDescriptor* lhs, const SkDescriptor* rhs) const {
+        return *lhs == *rhs;
+    }
+};
+
+template <typename T>
+using SkDescriptorMap =
+        std::unordered_map<
+                const SkDescriptor*,
+                T,
+                SkDescriptorMapOperators,
+                SkDescriptorMapOperators>;
+
 class SkStrikePinner {
 public:
     virtual ~SkStrikePinner() = default;