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- /*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkColor.h"
- #include "include/core/SkPixmap.h"
- #include "include/private/SkHalf.h"
- #include "include/private/SkTo.h"
- #include "include/utils/SkRandom.h"
- #include "src/core/SkAutoPixmapStorage.h"
- #include "src/core/SkOpts.h"
- #include "tests/Test.h"
- #include <cmath>
- static bool is_denorm(uint16_t h) {
- return (h & 0x7fff) < 0x0400;
- }
- static bool is_finite(uint16_t h) {
- return (h & 0x7c00) != 0x7c00;
- }
- DEF_TEST(SkHalfToFloat_finite_ftz, r) {
- for (uint32_t h = 0; h <= 0xffff; h++) {
- if (!is_finite(h)) {
- // _finite_ftz() only works for values that can be represented as a finite half float.
- continue;
- }
- // _finite_ftz() may flush denorms to zero. 0.0f will compare == with both +0.0f and -0.0f.
- float expected = SkHalfToFloat(h),
- alternate = is_denorm(h) ? 0.0f : expected;
- float actual = SkHalfToFloat_finite_ftz(h)[0];
- REPORTER_ASSERT(r, actual == expected || actual == alternate);
- }
- }
- DEF_TEST(SkFloatToHalf_finite_ftz, r) {
- #if 0
- for (uint64_t bits = 0; bits <= 0xffffffff; bits++) {
- #else
- SkRandom rand;
- for (int i = 0; i < 1000000; i++) {
- uint32_t bits = rand.nextU();
- #endif
- float f;
- memcpy(&f, &bits, 4);
- uint16_t expected = SkFloatToHalf(f);
- if (!is_finite(expected)) {
- // _finite_ftz() only works for values that can be represented as a finite half float.
- continue;
- }
- uint16_t alternate = expected;
- if (is_denorm(expected)) {
- // _finite_ftz() may flush denorms to zero, and happens to keep the sign bit.
- alternate = std::signbit(f) ? 0x8000 : 0x0000;
- }
- uint16_t actual = SkFloatToHalf_finite_ftz(Sk4f{f})[0];
- // _finite_ftz() may truncate instead of rounding, so it may be one too small.
- REPORTER_ASSERT(r, actual == expected || actual == expected - 1 ||
- actual == alternate || actual == alternate - 1);
- }
- }
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