1 2 /* 3 * Copyright 2006 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef SkScalarCompare_DEFINED 11 #define SkScalarCompare_DEFINED 12 13 #include "SkFloatBits.h" 14 #include "SkRect.h" 15 16 /** Skia can spend a lot of time just comparing scalars (e.g. quickReject). 17 When scalar==fixed, this is very fast, and when scalar==hardware-float, this 18 is also reasonable, but if scalar==software-float, then each compare can be 19 a function call and take real time. To account for that, we have the flag 20 SK_SCALAR_SLOW_COMPARES. 21 22 If this is defined, we have a special trick where we quickly convert floats 23 to a 2's compliment form, and then treat them as signed 32bit integers. In 24 this form we lose a few subtlties (e.g. NaNs always comparing false) but 25 we gain the speed of integer compares. 26 */ 27 28 #ifdef SK_SCALAR_SLOW_COMPARES 29 typedef int32_t SkScalarCompareType; 30 typedef SkIRect SkRectCompareType; 31 #define SkScalarToCompareType(x) SkScalarAs2sCompliment(x) 32 #else 33 typedef SkScalar SkScalarCompareType; 34 typedef SkRect SkRectCompareType; 35 #define SkScalarToCompareType(x) (x) 36 #endif 37 38 #endif 39 40
