Add SkChecksum::Murmur3.

bench/ChecksumBench.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkBenchmark.h"
 #include "SkCanvas.h"
 #include "SkChecksum.h"
 #include "SkMD5.h"
 #include "SkRandom.h"
 #include "SkSHA1.h"
 #include "SkTemplates.h"
 
 enum ChecksumType {
     kChecksum_ChecksumType,
     kMD5_ChecksumType,
-    kSHA1_ChecksumType
+    kSHA1_ChecksumType,
+    kMurmur3_ChecksumType,
 };
 
 class ComputeChecksumBench : public SkBenchmark {
     enum {
         U32COUNT  = 256,
         SIZE      = U32COUNT * 4,
         N         = SkBENCHLOOP(100000),
     };
     uint32_t    fData[U32COUNT];
     ChecksumType fType;
 
 public:
     ComputeChecksumBench(void* param, ChecksumType type) : INHERITED(param), fType(type) {
         SkRandom rand;
         for (int i = 0; i < U32COUNT; ++i) {
             fData[i] = rand.nextU();
         }
         fIsRendering = false;
     }
 
 protected:
     virtual const char* onGetName() {
         switch (fType) {
             case kChecksum_ChecksumType: return "compute_checksum";
             case kMD5_ChecksumType: return "compute_md5";
             case kSHA1_ChecksumType: return "compute_sha1";
+            case kMurmur3_ChecksumType: return "compute_murmur3";
+
             default: SK_CRASH(); return "";
         }
     }
 
     virtual void onDraw(SkCanvas*) {
         switch (fType) {
             case kChecksum_ChecksumType: {
                 for (int i = 0; i < N; i++) {
                     volatile uint32_t result = SkChecksum::Compute(fData, sizeof(fData));
                     sk_ignore_unused_variable(result);
                 }
             } break;
             case kMD5_ChecksumType: {
                 for (int i = 0; i < N; i++) {
                     SkMD5 md5;
                     md5.update(reinterpret_cast<uint8_t*>(fData), sizeof(fData));
                     SkMD5::Digest digest;
                     md5.finish(digest);
                 }
             } break;
             case kSHA1_ChecksumType: {
                 for (int i = 0; i < N; i++) {
                     SkSHA1 sha1;
                     sha1.update(reinterpret_cast<uint8_t*>(fData), sizeof(fData));
                     SkSHA1::Digest digest;
                     sha1.finish(digest);
                 }
             } break;
+            case kMurmur3_ChecksumType: {
+                for (int i = 0; i < N; i++) {
+                    volatile uint32_t result = SkChecksum::Murmur3(fData, sizeof(fData));
+                    sk_ignore_unused_variable(result);
+                }
+            }break;
         }
 
     }
 
 private:
     typedef SkBenchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static SkBenchmark* Fact0(void* p) { return new ComputeChecksumBench(p, kChecksum_ChecksumType); }
 static SkBenchmark* Fact1(void* p) { return new ComputeChecksumBench(p, kMD5_ChecksumType); }
 static SkBenchmark* Fact2(void* p) { return new ComputeChecksumBench(p, kSHA1_ChecksumType); }
+static SkBenchmark* Fact3(void* p) { return new ComputeChecksumBench(p, kMurmur3_ChecksumType); }
+
 
 static BenchRegistry gReg0(Fact0);
 static BenchRegistry gReg1(Fact1);
 static BenchRegistry gReg2(Fact2);
+static BenchRegistry gReg3(Fact3);
+