Home | History | Annotate | Download | only in animator 
      1 /* libs/graphics/animator/SkDisplayRandom.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 "SkDisplayRandom.h"
     19 #include "SkInterpolator.h"
     20 
     21 enum SkDisplayRandom_Properties {
     22     SK_PROPERTY(random),
     23     SK_PROPERTY(seed)
     24 };
     25 
     26 #if SK_USE_CONDENSED_INFO == 0
     27 
     28 const SkMemberInfo SkDisplayRandom::fInfo[] = {
     29     SK_MEMBER(blend, Float),
     30     SK_MEMBER(max, Float),
     31     SK_MEMBER(min, Float),
     32     SK_MEMBER_DYNAMIC_PROPERTY(random, Float),
     33     SK_MEMBER_PROPERTY(seed, Int)
     34 };
     35 
     36 #endif
     37 
     38 DEFINE_GET_MEMBER(SkDisplayRandom);
     39 
     40 SkDisplayRandom::SkDisplayRandom() : blend(0), min(0), max(SK_Scalar1) {
     41 }
     42 
     43 #ifdef SK_DUMP_ENABLED
     44 void SkDisplayRandom::dump(SkAnimateMaker* maker) {
     45     dumpBase(maker);
     46 #ifdef SK_CAN_USE_FLOAT
     47     SkDebugf("min=\"%g\" ", SkScalarToFloat(min));
     48     SkDebugf("max=\"%g\" ", SkScalarToFloat(max));
     49     SkDebugf("blend=\"%g\" ", SkScalarToFloat(blend));
     50 #else
     51     SkDebugf("min=\"%x\" ", min);
     52     SkDebugf("max=\"%x\" ", max);
     53     SkDebugf("blend=\"%x\" ", blend);
     54 #endif
     55     SkDebugf("/>\n");
     56 }
     57 #endif
     58 
     59 bool SkDisplayRandom::getProperty(int index, SkScriptValue* value) const {
     60     switch(index) {
     61         case SK_PROPERTY(random): {
     62             SkScalar random = fRandom.nextUScalar1();
     63             SkScalar relativeT = SkUnitCubicInterp(random, SK_Scalar1 - blend, 0, 0, SK_Scalar1 - blend);
     64             value->fOperand.fScalar = min + SkScalarMul(max - min, relativeT);
     65             value->fType = SkType_Float;
     66             return true;
     67         }
     68         default:
     69             SkASSERT(0);
     70     }
     71     return false;
     72 }
     73 
     74 bool SkDisplayRandom::setProperty(int index, SkScriptValue& value) {
     75     SkASSERT(index == SK_PROPERTY(seed));
     76     SkASSERT(value.fType == SkType_Int);
     77     fRandom.setSeed(value.fOperand.fS32);
     78     return true;
     79 }
     80 
     81