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skia2/tests/SkNxTest.cpp
mtklein 7c249e5319 SkNx: kth<...>() -> [...] 
Just some syntax cleanup.  No real change: kth<...>() was calling [...] already.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1714363002
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Review URL: https://codereview.chromium.org/1714363002
2016-02-21 10:54:19 -08:00

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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 "Sk4px.h"
#include "SkNx.h"
#include "SkRandom.h"
#include "Test.h"
template <int N>
static void test_Nf(skiatest::Reporter* r) {
auto assert_nearly_eq = [&](float eps, const SkNx<N, float>& v,
float a, float b, float c, float d) {
auto close = [=](float a, float b) { return fabsf(a-b) <= eps; };
float vals[4];
v.store(vals);
bool ok = close(vals[0], a) && close(vals[1], b)
&& close( v[0], a) && close( v[1], b);
REPORTER_ASSERT(r, ok);
if (N == 4) {
ok = close(vals[2], c) && close(vals[3], d)
&& close( v[2], c) && close( v[3], d);
REPORTER_ASSERT(r, ok);
}
};
auto assert_eq = [&](const SkNx<N, float>& v, float a, float b, float c, float d) {
return assert_nearly_eq(0, v, a,b,c,d);
};
float vals[] = {3, 4, 5, 6};
SkNx<N,float> a = SkNx<N,float>::Load(vals),
b(a),
c = a;
SkNx<N,float> d;
d = a;
assert_eq(a, 3, 4, 5, 6);
assert_eq(b, 3, 4, 5, 6);
assert_eq(c, 3, 4, 5, 6);
assert_eq(d, 3, 4, 5, 6);
assert_eq(a+b, 6, 8, 10, 12);
assert_eq(a*b, 9, 16, 25, 36);
assert_eq(a*b-b, 6, 12, 20, 30);
assert_eq((a*b).sqrt(), 3, 4, 5, 6);
assert_eq(a/b, 1, 1, 1, 1);
assert_eq(SkNx<N,float>(0)-a, -3, -4, -5, -6);
SkNx<N,float> fours(4);
assert_eq(fours.sqrt(), 2,2,2,2);
assert_nearly_eq(0.001f, fours.rsqrt0(), 0.5, 0.5, 0.5, 0.5);
assert_nearly_eq(0.001f, fours.rsqrt1(), 0.5, 0.5, 0.5, 0.5);
assert_nearly_eq(0.001f, fours.rsqrt2(), 0.5, 0.5, 0.5, 0.5);
assert_eq( fours. invert(), 0.25, 0.25, 0.25, 0.25);
assert_nearly_eq(0.001f, fours.approxInvert(), 0.25, 0.25, 0.25, 0.25);
assert_eq(SkNx<N,float>::Min(a, fours), 3, 4, 4, 4);
assert_eq(SkNx<N,float>::Max(a, fours), 4, 4, 5, 6);
// Test some comparisons. This is not exhaustive.
REPORTER_ASSERT(r, (a == b).allTrue());
REPORTER_ASSERT(r, (a+b == a*b-b).anyTrue());
REPORTER_ASSERT(r, !(a+b == a*b-b).allTrue());
REPORTER_ASSERT(r, !(a+b == a*b).anyTrue());
REPORTER_ASSERT(r, !(a != b).anyTrue());
REPORTER_ASSERT(r, (a < fours).anyTrue());
REPORTER_ASSERT(r, (a <= fours).anyTrue());
REPORTER_ASSERT(r, !(a > fours).allTrue());
REPORTER_ASSERT(r, !(a >= fours).allTrue());
}
DEF_TEST(SkNf, r) {
test_Nf<2>(r);
test_Nf<4>(r);
}
template <int N, typename T>
void test_Ni(skiatest::Reporter* r) {
auto assert_eq = [&](const SkNx<N,T>& v, T a, T b, T c, T d, T e, T f, T g, T h) {
T vals[8];
v.store(vals);
switch (N) {
case 8: REPORTER_ASSERT(r, vals[4] == e && vals[5] == f && vals[6] == g && vals[7] == h);
case 4: REPORTER_ASSERT(r, vals[2] == c && vals[3] == d);
case 2: REPORTER_ASSERT(r, vals[0] == a && vals[1] == b);
}
switch (N) {
case 8: REPORTER_ASSERT(r, v[4] == e && v[5] == f &&
v[6] == g && v[7] == h);
case 4: REPORTER_ASSERT(r, v[2] == c && v[3] == d);
case 2: REPORTER_ASSERT(r, v[0] == a && v[1] == b);
}
};
T vals[] = { 1,2,3,4,5,6,7,8 };
SkNx<N,T> a = SkNx<N,T>::Load(vals),
b(a),
c = a;
SkNx<N,T> d;
d = a;
assert_eq(a, 1,2,3,4,5,6,7,8);
assert_eq(b, 1,2,3,4,5,6,7,8);
assert_eq(c, 1,2,3,4,5,6,7,8);
assert_eq(d, 1,2,3,4,5,6,7,8);
assert_eq(a+a, 2,4,6,8,10,12,14,16);
assert_eq(a*a, 1,4,9,16,25,36,49,64);
assert_eq(a*a-a, 0,2,6,12,20,30,42,56);
assert_eq(a >> 2, 0,0,0,1,1,1,1,2);
assert_eq(a << 1, 2,4,6,8,10,12,14,16);
REPORTER_ASSERT(r, a[1] == 2);
}
DEF_TEST(SkNx, r) {
test_Ni<2, uint16_t>(r);
test_Ni<4, uint16_t>(r);
test_Ni<8, uint16_t>(r);
test_Ni<2, int>(r);
test_Ni<4, int>(r);
test_Ni<8, int>(r);
}
DEF_TEST(SkNi_min_lt, r) {
// Exhaustively check the 8x8 bit space.
for (int a = 0; a < (1<<8); a++) {
for (int b = 0; b < (1<<8); b++) {
Sk16b aw(a), bw(b);
REPORTER_ASSERT(r, Sk16b::Min(aw, bw)[0] == SkTMin(a, b));
REPORTER_ASSERT(r, !(aw < bw)[0] == !(a < b));
}}
// Exhausting the 16x16 bit space is kind of slow, so only do that in release builds.
#ifdef SK_DEBUG
SkRandom rand;
for (int i = 0; i < (1<<16); i++) {
uint16_t a = rand.nextU() >> 16,
b = rand.nextU() >> 16;
REPORTER_ASSERT(r, Sk16h::Min(Sk16h(a), Sk16h(b))[0] == SkTMin(a, b));
}
#else
for (int a = 0; a < (1<<16); a++) {
for (int b = 0; b < (1<<16); b++) {
REPORTER_ASSERT(r, Sk16h::Min(Sk16h(a), Sk16h(b))[0] == SkTMin(a, b));
}}
#endif
}
DEF_TEST(SkNi_saturatedAdd, r) {
for (int a = 0; a < (1<<8); a++) {
for (int b = 0; b < (1<<8); b++) {
int exact = a+b;
if (exact > 255) { exact = 255; }
if (exact < 0) { exact = 0; }
REPORTER_ASSERT(r, Sk16b(a).saturatedAdd(Sk16b(b))[0] == exact);
}
}
}
DEF_TEST(Sk4px_muldiv255round, r) {
for (int a = 0; a < (1<<8); a++) {
for (int b = 0; b < (1<<8); b++) {
int exact = (a*b+127)/255;
// Duplicate a and b 16x each.
auto av = Sk4px::DupAlpha(a),
bv = Sk4px::DupAlpha(b);
// This way should always be exactly correct.
int correct = (av * bv).div255()[0];
REPORTER_ASSERT(r, correct == exact);
// We're a bit more flexible on this method: correct for 0 or 255, otherwise off by <=1.
int fast = av.approxMulDiv255(bv)[0];
REPORTER_ASSERT(r, fast-exact >= -1 && fast-exact <= 1);
if (a == 0 || a == 255 || b == 0 || b == 255) {
REPORTER_ASSERT(r, fast == exact);
}
}
}
}
DEF_TEST(Sk4px_widening, r) {
SkPMColor colors[] = {
SkPreMultiplyColor(0xff00ff00),
SkPreMultiplyColor(0x40008000),
SkPreMultiplyColor(0x7f020406),
SkPreMultiplyColor(0x00000000),
};
auto packed = Sk4px::Load4(colors);
auto wideLo = packed.widenLo(),
wideHi = packed.widenHi(),
wideLoHi = packed.widenLoHi(),
wideLoHiAlt = wideLo + wideHi;
REPORTER_ASSERT(r, 0 == memcmp(&wideLoHi, &wideLoHiAlt, sizeof(wideLoHi)));
}
DEF_TEST(SkNx_abs, r) {
auto fs = Sk4f(0.0f, -0.0f, 2.0f, -4.0f).abs();
REPORTER_ASSERT(r, fs[0] == 0.0f);
REPORTER_ASSERT(r, fs[1] == 0.0f);
REPORTER_ASSERT(r, fs[2] == 2.0f);
REPORTER_ASSERT(r, fs[3] == 4.0f);
}
DEF_TEST(SkNx_floor, r) {
auto fs = Sk4f(0.4f, -0.4f, 0.6f, -0.6f).floor();
REPORTER_ASSERT(r, fs[0] == 0.0f);
REPORTER_ASSERT(r, fs[1] == -1.0f);
REPORTER_ASSERT(r, fs[2] == 0.0f);
REPORTER_ASSERT(r, fs[3] == -1.0f);
}
DEF_TEST(SkNx_shuffle, r) {
Sk4f f4(0,10,20,30);
Sk2f f2 = SkNx_shuffle<2,1>(f4);
REPORTER_ASSERT(r, f2[0] == 20);
REPORTER_ASSERT(r, f2[1] == 10);
f4 = SkNx_shuffle<0,1,1,0>(f2);
REPORTER_ASSERT(r, f4[0] == 20);
REPORTER_ASSERT(r, f4[1] == 10);
REPORTER_ASSERT(r, f4[2] == 10);
REPORTER_ASSERT(r, f4[3] == 20);
}
DEF_TEST(SkNx_int_float, r) {
Sk4f f(-2.3f, 1.0f, 0.45f, 0.6f);
Sk4i i = SkNx_cast<int>(f);
REPORTER_ASSERT(r, i[0] == -2);
REPORTER_ASSERT(r, i[1] == 1);
REPORTER_ASSERT(r, i[2] == 0);
REPORTER_ASSERT(r, i[3] == 0);
f = SkNx_cast<float>(i);
REPORTER_ASSERT(r, f[0] == -2.0f);
REPORTER_ASSERT(r, f[1] == 1.0f);
REPORTER_ASSERT(r, f[2] == 0.0f);
REPORTER_ASSERT(r, f[3] == 0.0f);
}
#include "SkRandom.h"
DEF_TEST(SkNx_u16_float, r) {
{
// u16 --> float
auto h4 = Sk4h(15, 17, 257, 65535);
auto f4 = SkNx_cast<float>(h4);
REPORTER_ASSERT(r, f4[0] == 15.0f);
REPORTER_ASSERT(r, f4[1] == 17.0f);
REPORTER_ASSERT(r, f4[2] == 257.0f);
REPORTER_ASSERT(r, f4[3] == 65535.0f);
}
{
// float -> u16
auto f4 = Sk4f(15, 17, 257, 65535);
auto h4 = SkNx_cast<uint16_t>(f4);
REPORTER_ASSERT(r, h4[0] == 15);
REPORTER_ASSERT(r, h4[1] == 17);
REPORTER_ASSERT(r, h4[2] == 257);
REPORTER_ASSERT(r, h4[3] == 65535);
}
// starting with any u16 value, we should be able to have a perfect round-trip in/out of floats
//
SkRandom rand;
for (int i = 0; i < 10000; ++i) {
const uint16_t s16[4] {
(uint16_t)rand.nextU16(), (uint16_t)rand.nextU16(),
(uint16_t)rand.nextU16(), (uint16_t)rand.nextU16(),
};
auto u4_0 = Sk4h::Load(s16);
auto f4 = SkNx_cast<float>(u4_0);
auto u4_1 = SkNx_cast<uint16_t>(f4);
uint16_t d16[4];
u4_1.store(d16);
REPORTER_ASSERT(r, !memcmp(s16, d16, sizeof(s16)));
}
}
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