40443b2371
git-svn-id: http://skia.googlecode.com/svn/trunk@260 2bbb7eff-a529-9590-31e7-b0007b416f81
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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