1 /* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SkScalarCompare_DEFINED 18 #define SkScalarCompare_DEFINED 19 20 #include "SkFloatBits.h" 21 #include "SkRect.h" 22 23 /** Skia can spend a lot of time just comparing scalars (e.g. quickReject). 24 When scalar==fixed, this is very fast, and when scalar==hardware-float, this 25 is also reasonable, but if scalar==software-float, then each compare can be 26 a function call and take real time. To account for that, we have the flag 27 SK_SCALAR_SLOW_COMPARES. 28 29 If this is defined, we have a special trick where we quickly convert floats 30 to a 2's compliment form, and then treat them as signed 32bit integers. In 31 this form we lose a few subtlties (e.g. NaNs always comparing false) but 32 we gain the speed of integer compares. 33 */ 34 35 #ifdef SK_SCALAR_SLOW_COMPARES 36 typedef int32_t SkScalarCompareType; 37 typedef SkIRect SkRectCompareType; 38 #define SkScalarToCompareType(x) SkScalarAs2sCompliment(x) 39 #else 40 typedef SkScalar SkScalarCompareType; 41 typedef SkRect SkRectCompareType; 42 #define SkScalarToCompareType(x) (x) 43 #endif 44 45 #endif 46 47
