SkFDot6.h revision 8ff8a1959f514b969198ec2242c7de57fbf413cd 
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 SkFDot6_DEFINED
11#define SkFDot6_DEFINED
12
13#include "SkScalar.h"
14#include "SkMath.h"
15
16typedef int32_t SkFDot6;
17
18#define SK_FDot6One         (64)
19#define SK_FDot6Half        (32)
20
21#ifdef SK_DEBUG
22    inline SkFDot6 SkIntToFDot6(S16CPU x) {
23        SkASSERT(SkToS16(x) == x);
24        return x << 6;
25    }
26#else
27    #define SkIntToFDot6(x) ((x) << 6)
28#endif
29
30#define SkFDot6Floor(x)     ((x) >> 6)
31#define SkFDot6Ceil(x)      (((x) + 63) >> 6)
32#define SkFDot6Round(x)     (((x) + 32) >> 6)
33
34#define SkFixedToFDot6(x)   ((x) >> 10)
35
36inline SkFixed SkFDot6ToFixed(SkFDot6 x) {
37    SkASSERT((x << 10 >> 10) == x);
38
39    return x << 10;
40}
41
42#ifdef SK_SCALAR_IS_FLOAT
43    #define SkScalarToFDot6(x)  (SkFDot6)((x) * 64)
44    #define SkFDot6ToScalar(x)  ((SkScalar)(x) * SkFloatToScalar(0.015625f))
45#else
46    #define SkScalarToFDot6(x)  ((x) >> 10)
47    #define SkFDot6ToScalar(x)  ((x) << 10)
48#endif
49
50inline SkFixed SkFDot6Div(SkFDot6 a, SkFDot6 b) {
51    SkASSERT(b != 0);
52
53    if (a == (int16_t)a) {
54        return (a << 16) / b;
55    } else {
56        return SkFixedDiv(a, b);
57    }
58}
59
60#endif
61
62