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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 "src/core/SkFixed15.h"
- #include "tests/Test.h"
- DEF_TEST(SkFixed15, r) {
- // For all v, v*0 == 0, v*1 == v.
- for (uint16_t bits = 0; bits <= 32768; bits++) {
- auto v = SkFixed15::Load(bits);
- REPORTER_ASSERT(r, v * 0.0f == 0.0f);
- REPORTER_ASSERT(r, v * 1.0f == v);
- }
- // Division and multiplication by powers of 2 is exact.
- SkFixed15 v = 1.0f;
- REPORTER_ASSERT(r, (v>>1) == 0.50f);
- REPORTER_ASSERT(r, (v>>2) == 0.25f);
- REPORTER_ASSERT(r, (v>>2<<1) == 0.50f);
- // FromU8() should be just as good as going through float.
- for (int x = 0; x < 256; x++) {
- REPORTER_ASSERT(r, SkFixed15::FromU8(x) == SkFixed15(x * (1/255.0f)));
- }
- // to_u8() and FromU8() should roundtrip all bytes.
- for (int x = 0; x < 256; x++) {
- REPORTER_ASSERT(r, x == SkFixed15::FromU8(x).to_u8());
- }
- }
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