a1ebeb25e9
This drives me nuts, and prevents `while (loops --> 0)`. BUG=skia: Review URL: https://codereview.chromium.org/1379923005
88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
/*
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* Copyright 2013 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 "SkColorPriv.h"
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#include "SkRandom.h"
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#include "SkString.h"
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template <bool kFast, bool kScale>
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class FourByteInterpBench : public Benchmark {
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public:
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FourByteInterpBench() {
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fName.set("four_byte_interp");
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fName.append(kFast ? "_fast" : "_slow");
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fName.append(kScale ? "_255" : "_256");
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}
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bool isSuitableFor(Backend backend) override {
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return backend == kNonRendering_Backend;
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}
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const char* onGetName() override { return fName.c_str(); }
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void onDelayedSetup() override {
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// A handful of random srcs and dsts.
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SkRandom rand;
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for (int i = 0; i < kInputs; i++) {
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fSrcs[i] = SkPreMultiplyColor(rand.nextU());
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fDsts[i] = SkPreMultiplyColor(rand.nextU());
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}
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// We'll exhaustively test all scales instead of using random numbers.
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for (int i = 0; i <= 256; i++) {
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fScales[i] = i;
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}
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if (kScale) fScales[256] = 255; // We'll just do 255 twice if we're limited to [0,255].
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}
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void onDraw(int loops, SkCanvas*) override {
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// We xor results of FourByteInterp into junk to make sure the function runs.
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volatile SkPMColor junk = 0;
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for (int loop = 0; loop < loops; loop++) {
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for (int i = 0; i < kInputs; i++) {
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for (size_t j = 0; j <= 256; j++) {
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// Note: we really want to load src and dst here and not outside in the i-loop.
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// If we put the loads there, a clever compiler will do the not-insignificant
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// work in the FourByteInterps that depends only on src and dst outside this
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// loop, so we'd only be benchmarking the back half of those functions that also
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// depends on scale. Even here, these must be volatile arrays to prevent that
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// clever compiler from hoisting the loads out of the loop on its own.
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const SkPMColor src = fSrcs[i];
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const SkPMColor dst = fDsts[i];
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const unsigned scale = fScales[j];
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if (kFast && kScale) {
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junk ^= SkFastFourByteInterp(src, dst, scale);
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} else if (kFast) {
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junk ^= SkFastFourByteInterp256(src, dst, scale);
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} else if (kScale) {
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junk ^= SkFourByteInterp(src, dst, scale);
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} else {
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junk ^= SkFourByteInterp256(src, dst, scale);
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}
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}
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}
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}
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}
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private:
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SkString fName;
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static const int kInputs = 10; // Arbitrary.
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volatile unsigned fSrcs[kInputs];
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volatile unsigned fDsts[kInputs];
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unsigned fScales[257]; // We need space for [0, 256].
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};
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#define COMMA ,
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DEF_BENCH(return (new FourByteInterpBench<true COMMA true>);)
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DEF_BENCH(return (new FourByteInterpBench<true COMMA false>);)
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DEF_BENCH(return (new FourByteInterpBench<false COMMA true>);)
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DEF_BENCH(return (new FourByteInterpBench<false COMMA false>);)
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#undef COMMA
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