SkFDot6.h revision 03202c9c3dfbf8c4feb0a1ee9b3680817e633f58 
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 SkFDot6_DEFINED
18#define SkFDot6_DEFINED
19
20#include "SkMath.h"
21
22typedef int32_t SkFDot6;
23
24#define SK_FDot61           (64)
25#define SK_FDot6Half        (32)
26
27#ifdef SK_DEBUG
28    inline SkFDot6 SkIntToFDot6(S16CPU x)
29    {
30        SkASSERT(SkToS16(x) == x);
31        return x << 6;
32    }
33#else
34    #define SkIntToFDot6(x) ((x) << 6)
35#endif
36
37#define SkFDot6Floor(x)     ((x) >> 6)
38#define SkFDot6Ceil(x)      (((x) + 63) >> 6)
39#define SkFDot6Round(x)     (((x) + 32) >> 6)
40
41#define SkFixedToFDot6(x)   ((x) >> 10)
42
43inline SkFixed SkFDot6ToFixed(SkFDot6 x)
44{
45    SkASSERT((x << 10 >> 10) == x);
46
47    return x << 10;
48}
49
50#ifdef SK_SCALAR_IS_FLOAT
51    #define SkScalarToFDot6(x)  (SkFDot6)((x) * 64)
52#else
53    #define SkScalarToFDot6(x)  ((x) >> 10)
54#endif
55
56inline SkFixed SkFDot6Div(SkFDot6 a, SkFDot6 b)
57{
58    SkASSERT(b != 0);
59
60    if (a == (int16_t)a)
61        return (a << 16) / b;
62    else
63        return SkFixedDiv(a, b);
64}
65
66#endif
67
68