/* * 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 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); } }