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/SkottieValue.h"
11#include "modules/sksg/include/SkSGRenderEffect.h"
12#include "src/utils/SkJSON.h"
13
14namespace skottie {
15namespace internal {
16
17namespace {
18
19class DropShadowAdapter final : public AnimatablePropertyContainer {
20public:
21 static sk_sp<DropShadowAdapter> Make(const skjson::ArrayValue& jprops,
22 sk_sp<sksg::RenderNode> layer,
23 const AnimationBuilder& abuilder) {
24 enum : size_t {
25 kShadowColor_Index = 0,
26 kOpacity_Index = 1,
27 kDirection_Index = 2,
28 kDistance_Index = 3,
29 kSoftness_Index = 4,
30 kShadowOnly_Index = 5,
31 };
32
33 sk_sp<DropShadowAdapter> adapter(new DropShadowAdapter(std::move(layer)));
34
35 EffectBinder(jprops, abuilder, adapter.get())
36 .bind(kShadowColor_Index, adapter->fColor )
37 .bind( kOpacity_Index, adapter->fOpacity )
38 .bind( kDirection_Index, adapter->fDirection)
39 .bind( kDistance_Index, adapter->fDistance )
40 .bind( kSoftness_Index, adapter->fSoftness )
41 .bind( kShadowOnly_Index, adapter->fShdwOnly );
42
43 return adapter;
44 }
45
46 const sk_sp<sksg::RenderNode>& node() const { return fImageFilterEffect; }
47
48private:
49 explicit DropShadowAdapter(sk_sp<sksg::RenderNode> layer)
50 : fDropShadow(sksg::DropShadowImageFilter::Make())
51 , fImageFilterEffect(sksg::ImageFilterEffect::Make(std::move(layer), fDropShadow)) {}
52
53 void onSync() override {
54 // fColor -> RGB, fOpacity -> A
55 const SkColor color = fColor;
56 fDropShadow->setColor(SkColorSetA(color, SkTPin(SkScalarRoundToInt(fOpacity), 0, 255)));
57
58 // The offset is specified in terms of a bearing + distance.
59 const auto rad = SkDegreesToRadians(90 - fDirection);
60 fDropShadow->setOffset(SkVector::Make( fDistance * SkScalarCos(rad),
61 -fDistance * SkScalarSin(rad)));
62
63 const auto sigma = fSoftness * kBlurSizeToSigma;
64 fDropShadow->setSigma(SkVector::Make(sigma, sigma));
65
66 fDropShadow->setMode(SkToBool(fShdwOnly)
67 ? sksg::DropShadowImageFilter::Mode::kShadowOnly
68 : sksg::DropShadowImageFilter::Mode::kShadowAndForeground);
69 }
70
71 const sk_sp<sksg::DropShadowImageFilter> fDropShadow;
72 const sk_sp<sksg::RenderNode> fImageFilterEffect;
73
74 VectorValue fColor = { 0, 0, 0, 1 };
75 ScalarValue fOpacity = 255,
76 fDirection = 0,
77 fDistance = 0,
78 fSoftness = 0,
79 fShdwOnly = 0;
80};
81
82} // namespace
83
84sk_sp<sksg::RenderNode> EffectBuilder::attachDropShadowEffect(const skjson::ArrayValue& jprops,
85 sk_sp<sksg::RenderNode> layer) const {
86 return fBuilder->attachDiscardableAdapter<DropShadowAdapter>(jprops,
87 std::move(layer),
88 *fBuilder);
89}
90
91} // namespace internal
92} // namespace skottie
93