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 "include/private/base/SkTPin.h"
11 #include "modules/skottie/src/SkottieValue.h"
12 #include "modules/sksg/include/SkSGRenderEffect.h"
13 #include "src/utils/SkJSON.h"
14
15 namespace skottie {
16 namespace internal {
17
18 namespace {
19
20 class DropShadowAdapter final : public AnimatablePropertyContainer {
21 public:
Make(const skjson::ArrayValue & jprops,sk_sp<sksg::RenderNode> layer,const AnimationBuilder & abuilder)22 static sk_sp<DropShadowAdapter> Make(const skjson::ArrayValue& jprops,
23 sk_sp<sksg::RenderNode> layer,
24 const AnimationBuilder& abuilder) {
25 enum : size_t {
26 kShadowColor_Index = 0,
27 kOpacity_Index = 1,
28 kDirection_Index = 2,
29 kDistance_Index = 3,
30 kSoftness_Index = 4,
31 kShadowOnly_Index = 5,
32 };
33
34 sk_sp<DropShadowAdapter> adapter(new DropShadowAdapter(std::move(layer)));
35
36 EffectBinder(jprops, abuilder, adapter.get())
37 .bind(kShadowColor_Index, adapter->fColor )
38 .bind( kOpacity_Index, adapter->fOpacity )
39 .bind( kDirection_Index, adapter->fDirection)
40 .bind( kDistance_Index, adapter->fDistance )
41 .bind( kSoftness_Index, adapter->fSoftness )
42 .bind( kShadowOnly_Index, adapter->fShdwOnly );
43
44 return adapter;
45 }
46
node() const47 const sk_sp<sksg::RenderNode>& node() const { return fImageFilterEffect; }
48
49 private:
DropShadowAdapter(sk_sp<sksg::RenderNode> layer)50 explicit DropShadowAdapter(sk_sp<sksg::RenderNode> layer)
51 : fDropShadow(sksg::DropShadowImageFilter::Make())
52 , fImageFilterEffect(sksg::ImageFilterEffect::Make(std::move(layer), fDropShadow)) {}
53
onSync()54 void onSync() override {
55 // fColor -> RGB, fOpacity -> A
56 const SkColor color = fColor;
57 fDropShadow->setColor(SkColorSetA(color, SkTPin(SkScalarRoundToInt(fOpacity), 0, 255)));
58
59 // The offset is specified in terms of a bearing + distance.
60 const auto rad = SkDegreesToRadians(90 - fDirection);
61 fDropShadow->setOffset(SkVector::Make( fDistance * SkScalarCos(rad),
62 -fDistance * SkScalarSin(rad)));
63
64 const auto sigma = fSoftness * kBlurSizeToSigma;
65 fDropShadow->setSigma(SkVector::Make(sigma, sigma));
66
67 fDropShadow->setMode(SkToBool(fShdwOnly)
68 ? sksg::DropShadowImageFilter::Mode::kShadowOnly
69 : sksg::DropShadowImageFilter::Mode::kShadowAndForeground);
70 }
71
72 const sk_sp<sksg::DropShadowImageFilter> fDropShadow;
73 const sk_sp<sksg::RenderNode> fImageFilterEffect;
74
75 VectorValue fColor = { 0, 0, 0, 1 };
76 ScalarValue fOpacity = 255,
77 fDirection = 0,
78 fDistance = 0,
79 fSoftness = 0,
80 fShdwOnly = 0;
81 };
82
83 } // namespace
84
attachDropShadowEffect(const skjson::ArrayValue & jprops,sk_sp<sksg::RenderNode> layer) const85 sk_sp<sksg::RenderNode> EffectBuilder::attachDropShadowEffect(const skjson::ArrayValue& jprops,
86 sk_sp<sksg::RenderNode> layer) const {
87 return fBuilder->attachDiscardableAdapter<DropShadowAdapter>(jprops,
88 std::move(layer),
89 *fBuilder);
90 }
91
92 } // namespace internal
93 } // namespace skottie
94