| /* |
| * 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 "Test.h" |
| #include "SkColor.h" |
| #include "SkHalf.h" |
| #include "SkOpts.h" |
| #include "SkPixmap.h" |
| #include "SkRandom.h" |
| |
| static bool eq_within_half_float(float a, float b) { |
| const float kTolerance = 1.0f / (1 << (8 + 10)); |
| |
| SkHalf ha = SkFloatToHalf(a); |
| SkHalf hb = SkFloatToHalf(b); |
| float a2 = SkHalfToFloat(ha); |
| float b2 = SkHalfToFloat(hb); |
| return fabsf(a2 - b2) <= kTolerance; |
| } |
| |
| static bool eq_within_half_float(const SkPM4f& a, const SkPM4f& b) { |
| for (int i = 0; i < 4; ++i) { |
| if (!eq_within_half_float(a.fVec[i], b.fVec[i])) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| DEF_TEST(color_half_float, reporter) { |
| const int w = 100; |
| const int h = 100; |
| |
| SkImageInfo info = SkImageInfo::Make(w, h, kRGBA_F16_SkColorType, kPremul_SkAlphaType); |
| |
| SkAutoPixmapStorage pm; |
| pm.alloc(info); |
| REPORTER_ASSERT(reporter, pm.getSafeSize() == SkToSizeT(w * h * sizeof(uint64_t))); |
| |
| SkColor4f c4 { 0.5f, 1, 0.5f, 0.25f }; |
| pm.erase(c4); |
| |
| SkPM4f origpm4 = c4.premul(); |
| for (int y = 0; y < pm.height(); ++y) { |
| for (int x = 0; x < pm.width(); ++x) { |
| SkPM4f pm4 = SkPM4f::FromF16(pm.addrF16(x, y)); |
| REPORTER_ASSERT(reporter, eq_within_half_float(origpm4, pm4)); |
| } |
| } |
| } |
| |
| DEF_TEST(float_to_half, reporter) { |
| const float fs[] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 }; |
| const uint16_t hs[] = { 0x3c00, 0x4000, 0x4200, 0x4400, 0x4500, 0x4600, 0x4700 }; |
| |
| uint16_t hscratch[7]; |
| SkOpts::float_to_half(hscratch, fs, 7); |
| REPORTER_ASSERT(reporter, 0 == memcmp(hscratch, hs, sizeof(hs))); |
| |
| float fscratch[7]; |
| SkOpts::half_to_float(fscratch, hs, 7); |
| REPORTER_ASSERT(reporter, 0 == memcmp(fscratch, fs, sizeof(fs))); |
| } |
| |
| DEF_TEST(HalfToFloat_01, r) { |
| for (uint16_t h = 0; h < 0x8000; h++) { |
| float f = SkHalfToFloat(h); |
| if (f >= 0 && f <= 1) { |
| REPORTER_ASSERT(r, SkHalfToFloat_01(h)[0] == f); |
| REPORTER_ASSERT(r, SkFloatToHalf_01(SkHalfToFloat_01(h)) == h); |
| } |
| } |
| } |
| |
| DEF_TEST(FloatToHalf_01, r) { |
| #if 0 |
| for (uint32_t bits = 0; bits < 0x80000000; bits++) { |
| #else |
| SkRandom rand; |
| for (int i = 0; i < 1000000; i++) { |
| uint32_t bits = rand.nextU(); |
| #endif |
| float f; |
| memcpy(&f, &bits, 4); |
| if (f >= 0 && f <= 1) { |
| uint16_t h1 = (uint16_t)SkFloatToHalf_01(Sk4f(f,0,0,0)), |
| h2 = SkFloatToHalf(f); |
| bool ok = (h1 == h2 || h1 == h2-1); |
| REPORTER_ASSERT(r, ok); |
| if (!ok) { |
| SkDebugf("%08x (%d) -> %04x (%d), want %04x (%d)\n", |
| bits, bits>>23, h1, h1>>10, h2, h2>>10); |
| break; |
| } |
| } |
| } |
| } |