d32b8177da
Change-Id: Iedbcd2d938122cdc8f6b235745eb6165e348c237 Reviewed-on: https://skia-review.googlesource.com/7108 Commit-Queue: Mike Klein <mtklein@chromium.org> Reviewed-by: Herb Derby <herb@google.com>
35 lines
1004 B
C++
35 lines
1004 B
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "Test.h"
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#include "SkFixed15.h"
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DEF_TEST(SkFixed15, r) {
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// For all v, v*0 == 0, v*1 == v.
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for (uint16_t bits = 0; bits <= 32768; bits++) {
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auto v = SkFixed15::Load(bits);
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REPORTER_ASSERT(r, v * 0.0f == 0.0f);
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REPORTER_ASSERT(r, v * 1.0f == v);
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}
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// Division and multiplication by powers of 2 is exact.
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SkFixed15 v = 1.0f;
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REPORTER_ASSERT(r, (v>>1) == 0.50f);
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REPORTER_ASSERT(r, (v>>2) == 0.25f);
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REPORTER_ASSERT(r, (v>>2<<1) == 0.50f);
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// FromU8() should be just as good as going through float.
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for (int x = 0; x < 256; x++) {
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REPORTER_ASSERT(r, SkFixed15::FromU8(x) == SkFixed15(x * (1/255.0f)));
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}
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// to_u8() and FromU8() should roundtrip all bytes.
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for (int x = 0; x < 256; x++) {
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REPORTER_ASSERT(r, x == SkFixed15::FromU8(x).to_u8());
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}
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}
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