a1ebeb25e9
This drives me nuts, and prevents `while (loops --> 0)`. BUG=skia: Review URL: https://codereview.chromium.org/1379923005
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "Benchmark.h"
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#include "SkColor.h"
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#include "SkNx.h"
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// Used to prevent the compiler from optimizing away the whole loop.
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volatile uint32_t blackhole = 0;
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// Not a great random number generator, but it's very fast.
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// The code we're measuring is quite fast, so low overhead is essential.
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static uint32_t lcg_rand(uint32_t* seed) {
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*seed *= 1664525;
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*seed += 1013904223;
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return *seed;
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}
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struct Sk4fBytesRoundtripBench : public Benchmark {
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Sk4fBytesRoundtripBench() {}
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const char* onGetName() override { return "Sk4f_roundtrip"; }
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bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
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void onDraw(int loops, SkCanvas* canvas) override {
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// Unlike blackhole, junk can and probably will be a register.
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uint32_t junk = 0;
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uint32_t seed = 0;
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for (int i = 0; i < loops; i++) {
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uint32_t color = lcg_rand(&seed),
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back;
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auto f = Sk4f::FromBytes((const uint8_t*)&color);
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f.toBytes((uint8_t*)&back);
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junk ^= back;
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}
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blackhole ^= junk;
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}
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};
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DEF_BENCH(return new Sk4fBytesRoundtripBench;)
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struct Sk4fGradientBench : public Benchmark {
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const char* onGetName() override { return "Sk4f_gradient"; }
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bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
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SkPMColor fDevice[100];
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void onDraw(int loops, SkCanvas*) override {
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Sk4f c0(0,0,255,255),
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c1(255,0,0,255),
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dc = c1 - c0,
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fx(0.1f),
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dx(0.002f),
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dcdx(dc*dx),
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dcdx4(dcdx+dcdx+dcdx+dcdx);
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for (int n = 0; n < loops; n++) {
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Sk4f a = c0 + dc*fx + Sk4f(0.5f), // add an extra 0.5f to get rounding for free.
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b = a + dcdx,
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c = b + dcdx,
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d = c + dcdx;
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for (size_t i = 0; i < SK_ARRAY_COUNT(fDevice); i += 4) {
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a.toBytes((uint8_t*)(fDevice+i+0));
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b.toBytes((uint8_t*)(fDevice+i+1));
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c.toBytes((uint8_t*)(fDevice+i+2));
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d.toBytes((uint8_t*)(fDevice+i+3));
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a = a + dcdx4;
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b = b + dcdx4;
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c = c + dcdx4;
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d = d + dcdx4;
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}
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}
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}
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};
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DEF_BENCH(return new Sk4fGradientBench;)
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