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1 /* | |
2 * Copyright 2015 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #include "Benchmark.h" | |
9 #include "SkPMFloat.h" | |
10 | |
11 // Used to prevent the compiler from optimizing away the whole loop. | |
12 volatile uint32_t blackhole = 0; | |
13 | |
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. | |
16 static uint32_t lcg_rand(uint32_t* seed) { | |
17 *seed *= 1664525; | |
18 *seed += 1013904223; | |
19 return *seed; | |
20 } | |
21 | |
22 // I'm having better luck getting these to constant-propagate away as template p
arameters. | |
23 struct PMFloatRoundtripBench : public Benchmark { | |
24 PMFloatRoundtripBench() {} | |
25 | |
26 const char* onGetName() override { return "SkPMFloat_roundtrip"; } | |
27 bool isSuitableFor(Backend backend) override { return backend == kNonRenderi
ng_Backend; } | |
28 | |
29 void onDraw(const int loops, SkCanvas* canvas) override { | |
30 // Unlike blackhole, junk can and probably will be a register. | |
31 uint32_t junk = 0; | |
32 uint32_t seed = 0; | |
33 for (int i = 0; i < loops; i++) { | |
34 SkPMColor color; | |
35 #ifdef SK_DEBUG | |
36 // Our SkASSERTs will remind us that it's technically required that
we premultiply. | |
37 color = SkPreMultiplyColor(lcg_rand(&seed)); | |
38 #else | |
39 // But it's a lot faster not to, and this code won't really mind the
non-PM colors. | |
40 color = lcg_rand(&seed); | |
41 #endif | |
42 | |
43 auto f = SkPMFloat::FromPMColor(color); | |
44 SkPMColor back = f.round(); | |
45 junk ^= back; | |
46 } | |
47 blackhole ^= junk; | |
48 } | |
49 }; | |
50 DEF_BENCH(return new PMFloatRoundtripBench;) | |
51 | |
52 struct PMFloatGradientBench : public Benchmark { | |
53 const char* onGetName() override { return "PMFloat_gradient"; } | |
54 bool isSuitableFor(Backend backend) override { return backend == kNonRenderi
ng_Backend; } | |
55 | |
56 SkPMColor fDevice[100]; | |
57 void onDraw(const int loops, SkCanvas*) override { | |
58 Sk4f c0 = SkPMFloat::FromARGB(1, 1, 0, 0), | |
59 c1 = SkPMFloat::FromARGB(1, 0, 0, 1), | |
60 dc = c1 - c0, | |
61 fx(0.1f), | |
62 dx(0.002f), | |
63 dcdx(dc*dx), | |
64 dcdx4(dcdx+dcdx+dcdx+dcdx); | |
65 | |
66 for (int n = 0; n < loops; n++) { | |
67 Sk4f a = c0 + dc*fx, | |
68 b = a + dcdx, | |
69 c = b + dcdx, | |
70 d = c + dcdx; | |
71 for (size_t i = 0; i < SK_ARRAY_COUNT(fDevice); i += 4) { | |
72 fDevice[i+0] = SkPMFloat(a).round(); | |
73 fDevice[i+1] = SkPMFloat(b).round(); | |
74 fDevice[i+2] = SkPMFloat(c).round(); | |
75 fDevice[i+3] = SkPMFloat(d).round(); | |
76 a = a + dcdx4; | |
77 b = b + dcdx4; | |
78 c = c + dcdx4; | |
79 d = d + dcdx4; | |
80 } | |
81 } | |
82 } | |
83 }; | |
84 | |
85 DEF_BENCH(return new PMFloatGradientBench;) | |
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