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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "Benchmark.h" | 8 #include "Benchmark.h" |
9 #include "SkPMFloat.h" | 9 #include "SkPMFloat.h" |
10 | 10 |
11 // Used to prevent the compiler from optimizing away the whole loop. | 11 // Used to prevent the compiler from optimizing away the whole loop. |
12 volatile uint32_t blackhole = 0; | 12 volatile uint32_t blackhole = 0; |
13 | 13 |
14 // Not a great random number generator, but it's very fast. | 14 // Not a great random number generator, but it's very fast. |
15 // The code we're measuring is quite fast, so low overhead is essential. | 15 // The code we're measuring is quite fast, so low overhead is essential. |
16 static uint32_t lcg_rand(uint32_t* seed) { | 16 static uint32_t lcg_rand(uint32_t* seed) { |
17 *seed *= 1664525; | 17 *seed *= 1664525; |
18 *seed += 1013904223; | 18 *seed += 1013904223; |
19 return *seed; | 19 return *seed; |
20 } | 20 } |
21 | 21 |
22 // I'm having better luck getting these to constant-propagate away as template p
arameters. | 22 // I'm having better luck getting these to constant-propagate away as template p
arameters. |
23 template <bool kClamp, bool kWide> | 23 template <bool kClamp, bool kWide> |
24 struct PMFloatBench : public Benchmark { | 24 struct PMFloatBench : public Benchmark { |
25 PMFloatBench() {} | 25 PMFloatBench() {} |
26 | 26 |
27 const char* onGetName() SK_OVERRIDE { | 27 const char* onGetName() override { |
28 switch (kClamp << 1 | kWide) { | 28 switch (kClamp << 1 | kWide) { |
29 case 0: return "SkPMFloat_get_1x"; | 29 case 0: return "SkPMFloat_get_1x"; |
30 case 1: return "SkPMFloat_get_4x"; | 30 case 1: return "SkPMFloat_get_4x"; |
31 case 2: return "SkPMFloat_clamp_1x"; | 31 case 2: return "SkPMFloat_clamp_1x"; |
32 case 3: return "SkPMFloat_clamp_4x"; | 32 case 3: return "SkPMFloat_clamp_4x"; |
33 } | 33 } |
34 SkFAIL("unreachable"); | 34 SkFAIL("unreachable"); |
35 return "oh bother"; | 35 return "oh bother"; |
36 } | 36 } |
37 bool isSuitableFor(Backend backend) SK_OVERRIDE { return backend == kNonRend
ering_Backend; } | 37 bool isSuitableFor(Backend backend) override { return backend == kNonRenderi
ng_Backend; } |
38 | 38 |
39 void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE { | 39 void onDraw(const int loops, SkCanvas* canvas) override { |
40 // Unlike blackhole, junk can and probably will be a register. | 40 // Unlike blackhole, junk can and probably will be a register. |
41 uint32_t junk = 0; | 41 uint32_t junk = 0; |
42 uint32_t seed = 0; | 42 uint32_t seed = 0; |
43 for (int i = 0; i < loops; i++) { | 43 for (int i = 0; i < loops; i++) { |
44 SkPMColor colors[4]; | 44 SkPMColor colors[4]; |
45 #ifdef SK_DEBUG | 45 #ifdef SK_DEBUG |
46 for (int i = 0; i < 4; i++) { | 46 for (int i = 0; i < 4; i++) { |
47 // Our SkASSERTs will remind us that it's technically required t
hat we premultiply. | 47 // Our SkASSERTs will remind us that it's technically required t
hat we premultiply. |
48 colors[i] = SkPreMultiplyColor(lcg_rand(&seed)); | 48 colors[i] = SkPreMultiplyColor(lcg_rand(&seed)); |
49 } | 49 } |
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89 } | 89 } |
90 blackhole ^= junk; | 90 blackhole ^= junk; |
91 } | 91 } |
92 }; | 92 }; |
93 | 93 |
94 // Extra () help DEF_BENCH not get confused by the comma inside the <>. | 94 // Extra () help DEF_BENCH not get confused by the comma inside the <>. |
95 DEF_BENCH(return (new PMFloatBench< true, true>);) | 95 DEF_BENCH(return (new PMFloatBench< true, true>);) |
96 DEF_BENCH(return (new PMFloatBench<false, true>);) | 96 DEF_BENCH(return (new PMFloatBench<false, true>);) |
97 DEF_BENCH(return (new PMFloatBench< true, false>);) | 97 DEF_BENCH(return (new PMFloatBench< true, false>);) |
98 DEF_BENCH(return (new PMFloatBench<false, false>);) | 98 DEF_BENCH(return (new PMFloatBench<false, false>);) |
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