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39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
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/*
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* Copyright 2006 The Android Open Source Project
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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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#ifndef SkScalarCompare_DEFINED
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#define SkScalarCompare_DEFINED
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#include "SkFloatBits.h"
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#include "SkRect.h"
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/** Skia can spend a lot of time just comparing scalars (e.g. quickReject).
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When scalar==fixed, this is very fast, and when scalar==hardware-float, this
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is also reasonable, but if scalar==software-float, then each compare can be
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a function call and take real time. To account for that, we have the flag
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SK_SCALAR_SLOW_COMPARES.
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If this is defined, we have a special trick where we quickly convert floats
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to a 2's compliment form, and then treat them as signed 32bit integers. In
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this form we lose a few subtlties (e.g. NaNs always comparing false) but
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we gain the speed of integer compares.
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*/
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#ifdef SK_SCALAR_SLOW_COMPARES
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typedef int32_t SkScalarCompareType;
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typedef SkIRect SkRectCompareType;
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#define SkScalarToCompareType(x) SkScalarAs2sCompliment(x)
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#else
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typedef SkScalar SkScalarCompareType;
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typedef SkRect SkRectCompareType;
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#define SkScalarToCompareType(x) (x)
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#endif
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#endif
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