Some usability ideas around SkTHash.

  - By default, use new SkGoodHash to hash keys, which is:
    * for 4 byte values, use SkChecksum::Mix,
    * for SkStrings, use SkChecksum::Murmur3 on the data,
    * for other structs, shallow hash the struct with Murmur3.
  - Expand SkChecksum::Murmur3 to support non-4-byte-aligned data.
  - Add const foreach() methods.
  - Have foreach() take a functor, which allows lambdas.

BUG=skia:

Review URL: https://codereview.chromium.org/1021033002

1 files changed, 1 insertions, 6 deletions

diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index 1b77ed0e32..e0d2bf6d7c 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -403,13 +403,8 @@ private:
                 && fType      == rhs.fType
                 && fFboFormat == rhs.fFboFormat;
         }
-        static uint32_t Hash(const ReadPixelsSupportedFormat& r) {
-            return SkChecksum::Murmur3(reinterpret_cast<const uint32_t*>(&r), sizeof(r));
-        }
     };
-
-    mutable SkTHashMap<ReadPixelsSupportedFormat, bool, ReadPixelsSupportedFormat::Hash>
-        fReadPixelsSupportedCache;
+    mutable SkTHashMap<ReadPixelsSupportedFormat, bool> fReadPixelsSupportedCache;
 
     typedef GrDrawTargetCaps INHERITED;
 };