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
SkDisplayRandom()40 SkDisplayRandom::SkDisplayRandom() : blend(0), min(0), max(SK_Scalar1) {
41 }
42
43 #ifdef SK_DUMP_ENABLED
dump(SkAnimateMaker * maker)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
getProperty(int index,SkScriptValue * value) const59 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
setProperty(int index,SkScriptValue & value)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