michael@0: 
michael@0: /*
michael@0:  * Copyright 2006 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #include "SkDisplayRandom.h"
michael@0: #include "SkInterpolator.h"
michael@0: 
michael@0: enum SkDisplayRandom_Properties {
michael@0:     SK_PROPERTY(random),
michael@0:     SK_PROPERTY(seed)
michael@0: };
michael@0: 
michael@0: #if SK_USE_CONDENSED_INFO == 0
michael@0: 
michael@0: const SkMemberInfo SkDisplayRandom::fInfo[] = {
michael@0:     SK_MEMBER(blend, Float),
michael@0:     SK_MEMBER(max, Float),
michael@0:     SK_MEMBER(min, Float),
michael@0:     SK_MEMBER_DYNAMIC_PROPERTY(random, Float),
michael@0:     SK_MEMBER_PROPERTY(seed, Int)
michael@0: };
michael@0: 
michael@0: #endif
michael@0: 
michael@0: DEFINE_GET_MEMBER(SkDisplayRandom);
michael@0: 
michael@0: SkDisplayRandom::SkDisplayRandom() : blend(0), min(0), max(SK_Scalar1) {
michael@0: }
michael@0: 
michael@0: #ifdef SK_DUMP_ENABLED
michael@0: void SkDisplayRandom::dump(SkAnimateMaker* maker) {
michael@0:     dumpBase(maker);
michael@0:     SkDebugf("min=\"%g\" ", SkScalarToFloat(min));
michael@0:     SkDebugf("max=\"%g\" ", SkScalarToFloat(max));
michael@0:     SkDebugf("blend=\"%g\" ", SkScalarToFloat(blend));
michael@0:     SkDebugf("/>\n");
michael@0: }
michael@0: #endif
michael@0: 
michael@0: bool SkDisplayRandom::getProperty(int index, SkScriptValue* value) const {
michael@0:     switch(index) {
michael@0:         case SK_PROPERTY(random): {
michael@0:             SkScalar random = fRandom.nextUScalar1();
michael@0:             SkScalar relativeT = SkUnitCubicInterp(random, SK_Scalar1 - blend, 0, 0, SK_Scalar1 - blend);
michael@0:             value->fOperand.fScalar = min + SkScalarMul(max - min, relativeT);
michael@0:             value->fType = SkType_Float;
michael@0:             return true;
michael@0:         }
michael@0:         default:
michael@0:             SkASSERT(0);
michael@0:     }
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool SkDisplayRandom::setProperty(int index, SkScriptValue& value) {
michael@0:     SkASSERT(index == SK_PROPERTY(seed));
michael@0:     SkASSERT(value.fType == SkType_Int);
michael@0:     fRandom.setSeed(value.fOperand.fS32);
michael@0:     return true;
michael@0: }