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