1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "Test.h" 9 #include "SkFixed15.h" 10 11 DEF_TEST(SkFixed15, r) { 12 // For all v, v*0 == 0, v*1 == v. 13 for (uint16_t bits = 0; bits <= 32768; bits++) { 14 auto v = SkFixed15::Load(bits); 15 REPORTER_ASSERT(r, v * 0.0f == 0.0f); 16 REPORTER_ASSERT(r, v * 1.0f == v); 17 } 18 19 // Division and multiplication by powers of 2 is exact. 20 SkFixed15 v = 1.0f; 21 REPORTER_ASSERT(r, (v>>1) == 0.50f); 22 REPORTER_ASSERT(r, (v>>2) == 0.25f); 23 REPORTER_ASSERT(r, (v>>2<<1) == 0.50f); 24 25 // FromU8() should be just as good as going through float. 26 for (int x = 0; x < 256; x++) { 27 REPORTER_ASSERT(r, SkFixed15::FromU8(x) == SkFixed15(x * (1/255.0f))); 28 } 29 30 // to_u8() and FromU8() should roundtrip all bytes. 31 for (int x = 0; x < 256; x++) { 32 REPORTER_ASSERT(r, x == SkFixed15::FromU8(x).to_u8()); 33 } 34 } 35
