1
2/*
3 * Copyright 2006 The Android Open Source Project
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10#include "SkDisplayRandom.h"
11#include "SkInterpolator.h"
12
13enum SkDisplayRandom_Properties {
14    SK_PROPERTY(random),
15    SK_PROPERTY(seed)
16};
17
18#if SK_USE_CONDENSED_INFO == 0
19
20const SkMemberInfo SkDisplayRandom::fInfo[] = {
21    SK_MEMBER(blend, Float),
22    SK_MEMBER(max, Float),
23    SK_MEMBER(min, Float),
24    SK_MEMBER_DYNAMIC_PROPERTY(random, Float),
25    SK_MEMBER_PROPERTY(seed, Int)
26};
27
28#endif
29
30DEFINE_GET_MEMBER(SkDisplayRandom);
31
32SkDisplayRandom::SkDisplayRandom() : blend(0), min(0), max(SK_Scalar1) {
33}
34
35#ifdef SK_DUMP_ENABLED
36void SkDisplayRandom::dump(SkAnimateMaker* maker) {
37    dumpBase(maker);
38    SkDebugf("min=\"%g\" ", SkScalarToFloat(min));
39    SkDebugf("max=\"%g\" ", SkScalarToFloat(max));
40    SkDebugf("blend=\"%g\" ", SkScalarToFloat(blend));
41    SkDebugf("/>\n");
42}
43#endif
44
45bool SkDisplayRandom::getProperty(int index, SkScriptValue* value) const {
46    switch(index) {
47        case SK_PROPERTY(random): {
48            SkScalar random = fRandom.nextUScalar1();
49            SkScalar relativeT = SkUnitCubicInterp(random, SK_Scalar1 - blend, 0, 0, SK_Scalar1 - blend);
50            value->fOperand.fScalar = min + SkScalarMul(max - min, relativeT);
51            value->fType = SkType_Float;
52            return true;
53        }
54        default:
55            SkASSERT(0);
56    }
57    return false;
58}
59
60bool SkDisplayRandom::setProperty(int index, SkScriptValue& value) {
61    SkASSERT(index == SK_PROPERTY(seed));
62    SkASSERT(value.fType == SkType_Int);
63    fRandom.setSeed(value.fOperand.fS32);
64    return true;
65}
66