reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 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 | |
| 22 | typedef 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 | |
| 43 | inline 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 | |
| 56 | inline 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 | |