134 lines
4.6 KiB
C++
134 lines
4.6 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 "SkPMFloat.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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// I'm having better luck getting these to constant-propagate away as template parameters.
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template <bool kClamp, bool kWide>
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struct PMFloatGetSetBench : public Benchmark {
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PMFloatGetSetBench() {}
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const char* onGetName() override {
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switch (kClamp << 1 | kWide) {
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case 0: return "SkPMFloat_get_1x";
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case 1: return "SkPMFloat_get_4x";
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case 2: return "SkPMFloat_clamp_1x";
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case 3: return "SkPMFloat_clamp_4x";
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}
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SkFAIL("unreachable");
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return "oh bother";
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}
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bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
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void onDraw(const 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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SkPMColor colors[4];
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#ifdef SK_DEBUG
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for (int i = 0; i < 4; i++) {
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// Our SkASSERTs will remind us that it's technically required that we premultiply.
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colors[i] = SkPreMultiplyColor(lcg_rand(&seed));
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}
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#else
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// But it's a lot faster not to, and this code won't really mind the non-PM colors.
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(void)lcg_rand(&seed);
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colors[0] = seed + 0;
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colors[1] = seed + 1;
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colors[2] = seed + 2;
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colors[3] = seed + 3;
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#endif
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SkPMFloat fa,fb,fc,fd;
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if (kWide) {
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SkPMFloat::From4PMColors(colors, &fa, &fb, &fc, &fd);
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} else {
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fa = SkPMFloat::FromPMColor(colors[0]);
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fb = SkPMFloat::FromPMColor(colors[1]);
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fc = SkPMFloat::FromPMColor(colors[2]);
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fd = SkPMFloat::FromPMColor(colors[3]);
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}
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SkPMColor back[4];
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switch (kClamp << 1 | kWide) {
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case 0: {
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back[0] = fa.get();
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back[1] = fb.get();
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back[2] = fc.get();
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back[3] = fd.get();
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} break;
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case 1: SkPMFloat::To4PMColors(fa, fb, fc, fd, back); break;
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case 2: {
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back[0] = fa.clamped();
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back[1] = fb.clamped();
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back[2] = fc.clamped();
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back[3] = fd.clamped();
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} break;
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case 3: SkPMFloat::ClampTo4PMColors(fa, fb, fc, fd, back); break;
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}
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for (int i = 0; i < 4; i++) {
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junk ^= back[i];
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}
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}
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blackhole ^= junk;
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}
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};
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// Extra () help DEF_BENCH not get confused by the comma inside the <>.
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DEF_BENCH(return (new PMFloatGetSetBench< true, true>);)
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DEF_BENCH(return (new PMFloatGetSetBench<false, true>);)
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DEF_BENCH(return (new PMFloatGetSetBench< true, false>);)
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DEF_BENCH(return (new PMFloatGetSetBench<false, false>);)
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struct PMFloatGradientBench : public Benchmark {
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const char* onGetName() override { return "PMFloat_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(const int loops, SkCanvas*) override {
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Sk4f c0 = SkPMFloat::FromARGB(255, 255, 0, 0),
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c1 = SkPMFloat::FromARGB(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), // The +0.5f lets us call trunc() instead of get().
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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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fDevice[i+0] = SkPMFloat(a).trunc();
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fDevice[i+1] = SkPMFloat(b).trunc();
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fDevice[i+2] = SkPMFloat(c).trunc();
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fDevice[i+3] = SkPMFloat(d).trunc();
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a += dcdx4;
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b += dcdx4;
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c += dcdx4;
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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 PMFloatGradientBench;)
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