reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* libs/graphics/animator/SkDisplayMath.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkDisplayMath.h" |
| 19 | |
| 20 | enum SkDisplayMath_Properties { |
| 21 | SK_PROPERTY(E), |
| 22 | SK_PROPERTY(LN10), |
| 23 | SK_PROPERTY(LN2), |
| 24 | SK_PROPERTY(LOG10E), |
| 25 | SK_PROPERTY(LOG2E), |
| 26 | SK_PROPERTY(PI), |
| 27 | SK_PROPERTY(SQRT1_2), |
| 28 | SK_PROPERTY(SQRT2) |
| 29 | }; |
| 30 | |
| 31 | const SkScalar SkDisplayMath::gConstants[] = { |
| 32 | #ifdef SK_SCALAR_IS_FLOAT |
| 33 | 2.718281828f, // E |
| 34 | 2.302585093f, // LN10 |
| 35 | 0.693147181f, // LN2 |
| 36 | 0.434294482f, // LOG10E |
| 37 | 1.442695041f, // LOG2E |
| 38 | 3.141592654f, // PI |
| 39 | 0.707106781f, // SQRT1_2 |
| 40 | 1.414213562f // SQRT2 |
| 41 | #else |
| 42 | 0x2B7E1, // E |
| 43 | 0x24D76, // LN10 |
| 44 | 0xB172, // LN2 |
| 45 | 0x6F2E, // LOG10E |
| 46 | 0x17154, // LOG2E |
| 47 | 0x3243F, // PI |
| 48 | 0xB505, // SQRT1_2 |
| 49 | 0x16A0A // SQRT2 |
| 50 | #endif |
| 51 | }; |
| 52 | |
| 53 | enum SkDisplayMath_Functions { |
| 54 | SK_FUNCTION(abs), |
| 55 | SK_FUNCTION(acos), |
| 56 | SK_FUNCTION(asin), |
| 57 | SK_FUNCTION(atan), |
| 58 | SK_FUNCTION(atan2), |
| 59 | SK_FUNCTION(ceil), |
| 60 | SK_FUNCTION(cos), |
| 61 | SK_FUNCTION(exp), |
| 62 | SK_FUNCTION(floor), |
| 63 | SK_FUNCTION(log), |
| 64 | SK_FUNCTION(max), |
| 65 | SK_FUNCTION(min), |
| 66 | SK_FUNCTION(pow), |
| 67 | SK_FUNCTION(random), |
| 68 | SK_FUNCTION(round), |
| 69 | SK_FUNCTION(sin), |
| 70 | SK_FUNCTION(sqrt), |
| 71 | SK_FUNCTION(tan) |
| 72 | }; |
| 73 | |
| 74 | const SkFunctionParamType SkDisplayMath::fFunctionParameters[] = { |
| 75 | (SkFunctionParamType) SkType_Float, // abs |
| 76 | (SkFunctionParamType) 0, |
| 77 | (SkFunctionParamType) SkType_Float, // acos |
| 78 | (SkFunctionParamType) 0, |
| 79 | (SkFunctionParamType) SkType_Float, // asin |
| 80 | (SkFunctionParamType) 0, |
| 81 | (SkFunctionParamType) SkType_Float, // atan |
| 82 | (SkFunctionParamType) 0, |
| 83 | (SkFunctionParamType) SkType_Float, // atan2 |
| 84 | (SkFunctionParamType) SkType_Float, |
| 85 | (SkFunctionParamType) 0, |
| 86 | (SkFunctionParamType) SkType_Float, // ceil |
| 87 | (SkFunctionParamType) 0, |
| 88 | (SkFunctionParamType) SkType_Float, // cos |
| 89 | (SkFunctionParamType) 0, |
| 90 | (SkFunctionParamType) SkType_Float, // exp |
| 91 | (SkFunctionParamType) 0, |
| 92 | (SkFunctionParamType) SkType_Float, // floor |
| 93 | (SkFunctionParamType) 0, |
| 94 | (SkFunctionParamType) SkType_Float, // log |
| 95 | (SkFunctionParamType) 0, |
| 96 | (SkFunctionParamType) SkType_Array, // max |
| 97 | (SkFunctionParamType) 0, |
| 98 | (SkFunctionParamType) SkType_Array, // min |
| 99 | (SkFunctionParamType) 0, |
| 100 | (SkFunctionParamType) SkType_Float, // pow |
| 101 | (SkFunctionParamType) SkType_Float, |
| 102 | (SkFunctionParamType) 0, |
| 103 | (SkFunctionParamType) SkType_Float, // random |
| 104 | (SkFunctionParamType) 0, |
| 105 | (SkFunctionParamType) SkType_Float, // round |
| 106 | (SkFunctionParamType) 0, |
| 107 | (SkFunctionParamType) SkType_Float, // sin |
| 108 | (SkFunctionParamType) 0, |
| 109 | (SkFunctionParamType) SkType_Float, // sqrt |
| 110 | (SkFunctionParamType) 0, |
| 111 | (SkFunctionParamType) SkType_Float, // tan |
| 112 | (SkFunctionParamType) 0 |
| 113 | }; |
| 114 | |
| 115 | #if SK_USE_CONDENSED_INFO == 0 |
| 116 | |
| 117 | const SkMemberInfo SkDisplayMath::fInfo[] = { |
| 118 | SK_MEMBER_PROPERTY(E, Float), |
| 119 | SK_MEMBER_PROPERTY(LN10, Float), |
| 120 | SK_MEMBER_PROPERTY(LN2, Float), |
| 121 | SK_MEMBER_PROPERTY(LOG10E, Float), |
| 122 | SK_MEMBER_PROPERTY(LOG2E, Float), |
| 123 | SK_MEMBER_PROPERTY(PI, Float), |
| 124 | SK_MEMBER_PROPERTY(SQRT1_2, Float), |
| 125 | SK_MEMBER_PROPERTY(SQRT2, Float), |
| 126 | SK_MEMBER_FUNCTION(abs, Float), |
| 127 | SK_MEMBER_FUNCTION(acos, Float), |
| 128 | SK_MEMBER_FUNCTION(asin, Float), |
| 129 | SK_MEMBER_FUNCTION(atan, Float), |
| 130 | SK_MEMBER_FUNCTION(atan2, Float), |
| 131 | SK_MEMBER_FUNCTION(ceil, Float), |
| 132 | SK_MEMBER_FUNCTION(cos, Float), |
| 133 | SK_MEMBER_FUNCTION(exp, Float), |
| 134 | SK_MEMBER_FUNCTION(floor, Float), |
| 135 | SK_MEMBER_FUNCTION(log, Float), |
| 136 | SK_MEMBER_FUNCTION(max, Float), |
| 137 | SK_MEMBER_FUNCTION(min, Float), |
| 138 | SK_MEMBER_FUNCTION(pow, Float), |
| 139 | SK_MEMBER_FUNCTION(random, Float), |
| 140 | SK_MEMBER_FUNCTION(round, Float), |
| 141 | SK_MEMBER_FUNCTION(sin, Float), |
| 142 | SK_MEMBER_FUNCTION(sqrt, Float), |
| 143 | SK_MEMBER_FUNCTION(tan, Float) |
| 144 | }; |
| 145 | |
| 146 | #endif |
| 147 | |
| 148 | DEFINE_GET_MEMBER(SkDisplayMath); |
| 149 | |
| 150 | void SkDisplayMath::executeFunction(SkDisplayable* target, int index, |
| 151 | SkTDArray<SkScriptValue>& parameters, SkDisplayTypes type, |
| 152 | SkScriptValue* scriptValue) { |
| 153 | if (scriptValue == NULL) |
| 154 | return; |
| 155 | SkASSERT(target == this); |
| 156 | SkScriptValue* array = parameters.begin(); |
| 157 | SkScriptValue* end = parameters.end(); |
| 158 | SkScalar input = parameters[0].fOperand.fScalar; |
| 159 | SkScalar scalarResult; |
| 160 | switch (index) { |
| 161 | case SK_FUNCTION(abs): |
| 162 | scalarResult = SkScalarAbs(input); |
| 163 | break; |
| 164 | case SK_FUNCTION(acos): |
| 165 | scalarResult = SkScalarACos(input); |
| 166 | break; |
| 167 | case SK_FUNCTION(asin): |
| 168 | scalarResult = SkScalarASin(input); |
| 169 | break; |
| 170 | case SK_FUNCTION(atan): |
| 171 | scalarResult = SkScalarATan2(input, SK_Scalar1); |
| 172 | break; |
| 173 | case SK_FUNCTION(atan2): |
| 174 | scalarResult = SkScalarATan2(input, parameters[1].fOperand.fScalar); |
| 175 | break; |
| 176 | case SK_FUNCTION(ceil): |
| 177 | scalarResult = SkIntToScalar(SkScalarCeil(input)); |
| 178 | break; |
| 179 | case SK_FUNCTION(cos): |
| 180 | scalarResult = SkScalarCos(input); |
| 181 | break; |
| 182 | case SK_FUNCTION(exp): |
| 183 | scalarResult = SkScalarExp(input); |
| 184 | break; |
| 185 | case SK_FUNCTION(floor): |
| 186 | scalarResult = SkIntToScalar(SkScalarFloor(input)); |
| 187 | break; |
| 188 | case SK_FUNCTION(log): |
| 189 | scalarResult = SkScalarLog(input); |
| 190 | break; |
| 191 | case SK_FUNCTION(max): |
| 192 | scalarResult = -SK_ScalarMax; |
| 193 | while (array < end) { |
| 194 | scalarResult = SkMaxScalar(scalarResult, array->fOperand.fScalar); |
| 195 | array++; |
| 196 | } |
| 197 | break; |
| 198 | case SK_FUNCTION(min): |
| 199 | scalarResult = SK_ScalarMax; |
| 200 | while (array < end) { |
| 201 | scalarResult = SkMinScalar(scalarResult, array->fOperand.fScalar); |
| 202 | array++; |
| 203 | } |
| 204 | break; |
| 205 | case SK_FUNCTION(pow): |
| 206 | // not the greatest -- but use x^y = e^(y * ln(x)) |
| 207 | scalarResult = SkScalarLog(input); |
| 208 | scalarResult = SkScalarMul(parameters[1].fOperand.fScalar, scalarResult); |
| 209 | scalarResult = SkScalarExp(scalarResult); |
| 210 | break; |
| 211 | case SK_FUNCTION(random): |
| 212 | scalarResult = fRandom.nextUScalar1(); |
| 213 | break; |
| 214 | case SK_FUNCTION(round): |
| 215 | scalarResult = SkIntToScalar(SkScalarRound(input)); |
| 216 | break; |
| 217 | case SK_FUNCTION(sin): |
| 218 | scalarResult = SkScalarSin(input); |
| 219 | break; |
| 220 | case SK_FUNCTION(sqrt): { |
| 221 | SkASSERT(parameters.count() == 1); |
| 222 | SkASSERT(type == SkType_Float); |
| 223 | scalarResult = SkScalarSqrt(input); |
| 224 | } break; |
| 225 | case SK_FUNCTION(tan): |
| 226 | scalarResult = SkScalarTan(input); |
| 227 | break; |
| 228 | default: |
| 229 | SkASSERT(0); |
| 230 | scalarResult = SK_ScalarNaN; |
| 231 | } |
| 232 | scriptValue->fOperand.fScalar = scalarResult; |
| 233 | scriptValue->fType = SkType_Float; |
| 234 | } |
| 235 | |
| 236 | const SkFunctionParamType* SkDisplayMath::getFunctionsParameters() { |
| 237 | return fFunctionParameters; |
| 238 | } |
| 239 | |
| 240 | bool SkDisplayMath::getProperty(int index, SkScriptValue* value) const { |
| 241 | if ((unsigned)index < SK_ARRAY_COUNT(gConstants)) { |
| 242 | value->fOperand.fScalar = gConstants[index]; |
| 243 | value->fType = SkType_Float; |
| 244 | return true; |
| 245 | } |
| 246 | SkASSERT(0); |
| 247 | return false; |
| 248 | } |