reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2006-2008 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 SkFilter_DEFINED |
| 18 | #define SkFilter_DEFINED |
| 19 | |
| 20 | #include "SkMath.h" |
| 21 | #include "SkFixed.h" |
| 22 | |
| 23 | typedef unsigned (*SkFilterProc)(unsigned x00, unsigned x01, |
| 24 | unsigned x10, unsigned x11); |
| 25 | |
| 26 | const SkFilterProc* SkGetBilinearFilterProcTable(); |
| 27 | |
| 28 | inline SkFilterProc SkGetBilinearFilterProc(const SkFilterProc* table, |
| 29 | SkFixed x, SkFixed y) |
| 30 | { |
| 31 | SkASSERT(table); |
| 32 | |
| 33 | // convert to dot 2 |
| 34 | x = (unsigned)(x << 16) >> 30; |
| 35 | y = (unsigned)(y << 16) >> 30; |
| 36 | return table[(y << 2) | x]; |
| 37 | } |
| 38 | |
| 39 | inline SkFilterProc SkGetBilinearFilterProc22(const SkFilterProc* table, |
| 40 | unsigned x, unsigned y) |
| 41 | { |
| 42 | SkASSERT(table); |
| 43 | |
| 44 | // extract low 2 bits |
| 45 | x = x << 30 >> 30; |
| 46 | y = y << 30 >> 30; |
| 47 | return table[(y << 2) | x]; |
| 48 | } |
| 49 | |
| 50 | inline const SkFilterProc* SkGetBilinearFilterProc22Row(const SkFilterProc* table, |
| 51 | unsigned y) |
| 52 | { |
| 53 | SkASSERT(table); |
| 54 | // extract low 2 bits and shift up 2 |
| 55 | return &table[y << 30 >> 28]; |
| 56 | } |
| 57 | |
| 58 | inline SkFilterProc SkGetBilinearFilterProc22RowProc(const SkFilterProc* row, |
| 59 | unsigned x) |
| 60 | { |
| 61 | SkASSERT(row); |
| 62 | // extract low 2 bits |
| 63 | return row[x << 30 >> 30]; |
| 64 | } |
| 65 | |
| 66 | /////////////////////////////////////////////////////////////////////////////// |
| 67 | |
| 68 | typedef unsigned (*SkFilter32Proc)(uint32_t x00, uint32_t x01, |
| 69 | uint32_t x10, uint32_t x11); |
| 70 | |
| 71 | const SkFilter32Proc* SkGetFilter32ProcTable(); |
| 72 | |
| 73 | inline SkFilter32Proc SkGetFilter32Proc22(const SkFilter32Proc* table, |
| 74 | unsigned x, unsigned y) |
| 75 | { |
| 76 | SkASSERT(table); |
| 77 | |
| 78 | // extract low 2 bits |
| 79 | x = x << 30 >> 30; |
| 80 | y = y << 30 >> 30; |
| 81 | return table[(y << 2) | x]; |
| 82 | } |
| 83 | |
| 84 | inline const SkFilter32Proc* SkGetFilter32Proc22Row(const SkFilter32Proc* table, |
| 85 | unsigned y) |
| 86 | { |
| 87 | SkASSERT(table); |
| 88 | // extract low 2 bits and shift up 2 |
| 89 | return &table[y << 30 >> 28]; |
| 90 | } |
| 91 | |
| 92 | inline SkFilter32Proc SkGetFilter32Proc22RowProc(const SkFilter32Proc* row, |
| 93 | unsigned x) |
| 94 | { |
| 95 | SkASSERT(row); |
| 96 | // extract low 2 bits |
| 97 | return row[x << 30 >> 30]; |
| 98 | } |
| 99 | |
| 100 | /////////////////////////////////////////////////////////////////////////////// |
| 101 | |
| 102 | /** Special version of SkFilterProc. This takes the address of 4 ints, and combines them a byte at a |
| 103 | time. AABBCCDD. |
| 104 | */ |
| 105 | typedef uint32_t (*SkFilterPtrProc)(const uint32_t*, const uint32_t*, const uint32_t*, const uint32_t*); |
| 106 | |
| 107 | const SkFilterPtrProc* SkGetBilinearFilterPtrProcTable(); |
| 108 | inline SkFilterPtrProc SkGetBilinearFilterPtrProc(const SkFilterPtrProc* table, SkFixed x, SkFixed y) |
| 109 | { |
| 110 | SkASSERT(table); |
| 111 | |
| 112 | // convert to dot 2 |
| 113 | x = (unsigned)(x << 16) >> 30; |
| 114 | y = (unsigned)(y << 16) >> 30; |
| 115 | return table[(y << 2) | x]; |
| 116 | } |
| 117 | |
| 118 | /** Given a Y value, return a subset of the proc table for that value. |
| 119 | Pass this to SkGetBilinearFilterPtrXProc with the corresponding X value to get the |
| 120 | correct proc. |
| 121 | */ |
| 122 | inline const SkFilterPtrProc* SkGetBilinearFilterPtrProcYTable(const SkFilterPtrProc* table, SkFixed y) |
| 123 | { |
| 124 | SkASSERT(table); |
| 125 | |
| 126 | y = (unsigned)(y << 16) >> 30; |
| 127 | return table + (y << 2); |
| 128 | } |
| 129 | |
| 130 | /** Given a subtable returned by SkGetBilinearFilterPtrProcYTable(), return the proc for the |
| 131 | specified X value. |
| 132 | */ |
| 133 | inline SkFilterPtrProc SkGetBilinearFilterPtrXProc(const SkFilterPtrProc* table, SkFixed x) |
| 134 | { |
| 135 | SkASSERT(table); |
| 136 | |
| 137 | // convert to dot 2 |
| 138 | x = (unsigned)(x << 16) >> 30; |
| 139 | return table[x]; |
| 140 | } |
| 141 | |
| 142 | #endif |
| 143 | |
| 144 | |