From d280d425bd541ebbb3a5e9045913eabb3f85f04b Mon Sep 17 00:00:00 2001 From: Mike Klein Date: Mon, 31 Oct 2016 09:20:54 -0400 Subject: SkFixed15 BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3981 Change-Id: I811b22004e8e2d5b7135f574caea296ffdff7011 Reviewed-on: https://skia-review.googlesource.com/3981 Reviewed-by: Mike Reed Commit-Queue: Mike Klein --- tests/SkFixed15Test.cpp | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 tests/SkFixed15Test.cpp (limited to 'tests/SkFixed15Test.cpp') diff --git a/tests/SkFixed15Test.cpp b/tests/SkFixed15Test.cpp new file mode 100644 index 0000000000..e2108d5604 --- /dev/null +++ b/tests/SkFixed15Test.cpp @@ -0,0 +1,29 @@ +/* + * 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 "SkFixed15.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))); + } +} -- cgit v1.2.3