generalize xferu64 procs using proc4f

bench/XferU64Bench.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Benchmark.h"
 #include "SkString.h"
 #include "SkXfermode.h"
 
 #define USE_AA      (1 << 31)   // merge with Xfermode::PMFlags w/o conflict
 
 #define INNER_LOOPS 1000
 
 // Benchmark that draws non-AA rects or AA text with an SkXfermode::Mode.
 class XferU64Bench : public Benchmark {
 public:
-    XferU64Bench(bool doN, uint32_t flags)
+    XferU64Bench(SkXfermode::Mode mode, const char name[], bool doN, uint32_t flags)
         : fDoN(doN)
         , fFlags(flags & ~USE_AA)
     {
-        SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode;
+        fXfer.reset(SkXfermode::Create(mode));
 
         fProc1 = SkXfermode::GetU64Proc1(mode, fFlags);
         fProcN = SkXfermode::GetU64ProcN(mode, fFlags);
-        fName.printf("xferu64_%s_%c_%s_%s",
+        fName.printf("xferu64_%s_%s_%c_%s_%s",
+                     name,
                      (flags & USE_AA) ? "aa" : "bw",
                      fDoN ? 'N' : '1',
                      (flags & SkXfermode::kSrcIsOpaque_U64Flag) ? "opaque" : "alpha",
                      (flags & SkXfermode::kDstIsFloat16_U64Flag) ? "f16" : "u16");
 
         for (int i = 0; i < N; ++i) {
             fSrc[i] = {{ 1, 1, 1, 1 }};
             fDst[i] = 0;
             fAAStorage[i] = i * 255 / (N - 1);
         }
         
         if (flags & USE_AA) {
             fAA = fAAStorage;
         } else {
             fAA = nullptr;
         }
     }
 
 protected:
     bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
 
     const char* onGetName() override { return fName.c_str(); }
 
     void onDraw(int loops, SkCanvas*) override {
-        const SkXfermode::U64State state{ nullptr, fFlags };
+        const SkXfermode::U64State state{ fXfer, fFlags };
 
         for (int i = 0; i < loops * INNER_LOOPS; ++i) {
             if (fDoN) {
                 fProcN(state, fDst, fSrc, N, fAA);
             } else {
                 fProc1(state, fDst, fSrc[0], N, fAA);
             }
         }
     }
 
 private:
+    SkAutoTUnref<SkXfermode> fXfer;
     SkString             fName;
     SkXfermode::U64Proc1 fProc1;
     SkXfermode::U64ProcN fProcN;
     const SkAlpha*  fAA;
     bool            fDoN;
     uint32_t        fFlags;
 
     enum {
         N = 1000,
     };
     SkPM4f      fSrc[N];
     uint64_t    fDst[N];
     uint8_t     fAAStorage[N];
 
     typedef Benchmark INHERITED;
 };
 
 #define F00 0
 #define F01 (SkXfermode::kSrcIsOpaque_U64Flag)
 #define F10 (SkXfermode::kDstIsFloat16_U64Flag)
 #define F11 (SkXfermode::kDstIsFloat16_U64Flag | SkXfermode::kSrcIsOpaque_U64Flag)
 
-#if 0
-DEF_BENCH( return new XferU64Bench(true,  F10 | USE_AA); )
-DEF_BENCH( return new XferU64Bench(true,  F11 | USE_AA); )
-DEF_BENCH( return new XferU64Bench(true,  F10); )
-DEF_BENCH( return new XferU64Bench(true,  F11); )
+#define MODE    SkXfermode::kSrcOver_Mode
+#define NAME    "srcover"
 
-DEF_BENCH( return new XferU64Bench(true,  F00 | USE_AA); )
-DEF_BENCH( return new XferU64Bench(true,  F01 | USE_AA); )
-DEF_BENCH( return new XferU64Bench(true,  F00); )
-DEF_BENCH( return new XferU64Bench(true,  F01); )
-#endif
+DEF_BENCH( return new XferU64Bench(MODE, NAME, true,  F10 | USE_AA); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, true,  F11 | USE_AA); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, true,  F10); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, true,  F11); )
 
-DEF_BENCH( return new XferU64Bench(false, F10 | USE_AA); )
-DEF_BENCH( return new XferU64Bench(false, F11 | USE_AA); )
-DEF_BENCH( return new XferU64Bench(false, F10); )
-DEF_BENCH( return new XferU64Bench(false, F11); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, true,  F00 | USE_AA); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, true,  F01 | USE_AA); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, true,  F00); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, true,  F01); )
 
-DEF_BENCH( return new XferU64Bench(false, F00 | USE_AA); )
-DEF_BENCH( return new XferU64Bench(false, F01 | USE_AA); )
-DEF_BENCH( return new XferU64Bench(false, F00); )
-DEF_BENCH( return new XferU64Bench(false, F01); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, false, F10 | USE_AA); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, false, F11 | USE_AA); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, false, F10); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, false, F11); )
+
+DEF_BENCH( return new XferU64Bench(MODE, NAME, false, F00 | USE_AA); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, false, F01 | USE_AA); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, false, F00); )
+DEF_BENCH( return new XferU64Bench(MODE, NAME, false, F01); )