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/*
* Copyright 2015 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 "SkColor.h"
#include "SkNx.h"
// Used to prevent the compiler from optimizing away the whole loop.
volatile uint32_t blackhole = 0;
// Not a great random number generator, but it's very fast.
// The code we're measuring is quite fast, so low overhead is essential.
static uint32_t lcg_rand(uint32_t* seed) {
*seed *= 1664525;
*seed += 1013904223;
return *seed;
}
struct Sk4fBytesRoundtripBench : public Benchmark {
Sk4fBytesRoundtripBench() {}
const char* onGetName() override { return "Sk4f_roundtrip"; }
bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
void onDraw(int loops, SkCanvas* canvas) override {
// Unlike blackhole, junk can and probably will be a register.
uint32_t junk = 0;
uint32_t seed = 0;
for (int i = 0; i < loops; i++) {
uint32_t color = lcg_rand(&seed),
back;
auto f = Sk4f::FromBytes((const uint8_t*)&color);
f.toBytes((uint8_t*)&back);
junk ^= back;
}
blackhole ^= junk;
}
};
DEF_BENCH(return new Sk4fBytesRoundtripBench;)
struct Sk4fGradientBench : public Benchmark {
const char* onGetName() override { return "Sk4f_gradient"; }
bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
SkPMColor fDevice[100];
void onDraw(int loops, SkCanvas*) override {
Sk4f c0(0,0,255,255),
c1(255,0,0,255),
dc = c1 - c0,
fx(0.1f),
dx(0.002f),
dcdx(dc*dx),
dcdx4(dcdx+dcdx+dcdx+dcdx);
for (int n = 0; n < loops; n++) {
Sk4f a = c0 + dc*fx + Sk4f(0.5f), // add an extra 0.5f to get rounding for free.
b = a + dcdx,
c = b + dcdx,
d = c + dcdx;
for (size_t i = 0; i < SK_ARRAY_COUNT(fDevice); i += 4) {
Sk4f::ToBytes((uint8_t*)(fDevice+i), a, b, c, d);
a = a + dcdx4;
b = b + dcdx4;
c = c + dcdx4;
d = d + dcdx4;
}
}
}
};
DEF_BENCH(return new Sk4fGradientBench;)
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