1/*
2 * Copyright 2019 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "modules/skottie/src/effects/Effects.h"
9
10#include "modules/skottie/src/Adapter.h"
11#include "modules/skottie/src/SkottieValue.h"
12#include "modules/sksg/include/SkSGColorFilter.h"
13#include "modules/sksg/include/SkSGPaint.h"
14#include "src/utils/SkJSON.h"
15
16namespace skottie {
17namespace internal {
18
19namespace  {
20
21class TritoneAdapter final : public AnimatablePropertyContainer {
22public:
23    static sk_sp<TritoneAdapter> Make(const skjson::ArrayValue& jprops,
24                                      sk_sp<sksg::RenderNode> layer,
25                                      const AnimationBuilder& abuilder) {
26        return sk_sp<TritoneAdapter>(new TritoneAdapter(jprops, std::move(layer), abuilder));
27    }
28
29    const auto& node() const { return fCF; }
30
31private:
32    TritoneAdapter(const skjson::ArrayValue& jprops,
33                   sk_sp<sksg::RenderNode> layer,
34                   const AnimationBuilder& abuilder)
35        : fLoColorNode(sksg::Color::Make(SK_ColorBLACK))
36        , fMiColorNode(sksg::Color::Make(SK_ColorBLACK))
37        , fHiColorNode(sksg::Color::Make(SK_ColorBLACK))
38        , fCF(sksg::GradientColorFilter::Make(std::move(layer),
39                                              { fLoColorNode, fMiColorNode, fHiColorNode })) {
40        enum : size_t {
41                kHiColor_Index = 0,
42                kMiColor_Index = 1,
43                kLoColor_Index = 2,
44            kBlendAmount_Index = 3,
45        };
46
47        EffectBinder(jprops, abuilder, this)
48            .bind(    kHiColor_Index, fHiColor)
49            .bind(    kMiColor_Index, fMiColor)
50            .bind(    kLoColor_Index, fLoColor)
51            .bind(kBlendAmount_Index, fWeight );
52    }
53
54    void onSync() override {
55        fLoColorNode->setColor(fLoColor);
56        fMiColorNode->setColor(fMiColor);
57        fHiColorNode->setColor(fHiColor);
58
59        // 100-based, inverted
60        fCF->setWeight((100 - fWeight) / 100);
61    }
62
63    const sk_sp<sksg::Color> fLoColorNode,
64                             fMiColorNode,
65                             fHiColorNode;
66    const sk_sp<sksg::GradientColorFilter> fCF;
67
68    VectorValue fLoColor,
69                fMiColor,
70                fHiColor;
71    ScalarValue fWeight = 0;
72};
73
74} // namespace
75
76sk_sp<sksg::RenderNode> EffectBuilder::attachTritoneEffect(const skjson::ArrayValue& jprops,
77                                                           sk_sp<sksg::RenderNode> layer) const {
78    return fBuilder->attachDiscardableAdapter<TritoneAdapter>(jprops, std::move(layer), *fBuilder);
79}
80
81} // namespace internal
82} // namespace skottie
83