1 /*
2  * Copyright 2014 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef SkHalf_DEFINED
9 #define SkHalf_DEFINED
10 
11 #include "SkTypes.h"
12 
13 // 16-bit floating point value
14 // format is 1 bit sign, 5 bits exponent, 10 bits mantissa
15 // only used for storage
16 typedef uint16_t SkHalf;
17 
18 #define SK_HalfMin      0x0400   // 2^-24  (minimum positive normal value)
19 #define SK_HalfMax      0x7bff   // 65504
20 #define SK_HalfEpsilon  0x1400   // 2^-10
21 
22 // convert between half and single precision floating point
23 float SkHalfToFloat(SkHalf h);
24 SkHalf SkFloatToHalf(float f);
25 
26 #endif
27