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/SkottieAdapter.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 SkNVRefCnt<DropShadowAdapter> {
21 public:
DropShadowAdapter(sk_sp<sksg::DropShadowImageFilter> dropShadow)22 explicit DropShadowAdapter(sk_sp<sksg::DropShadowImageFilter> dropShadow)
23 : fDropShadow(std::move(dropShadow)) {
24 SkASSERT(fDropShadow);
25 }
26
27 ADAPTER_PROPERTY(Color , SkColor , SK_ColorBLACK)
28 ADAPTER_PROPERTY(Opacity , SkScalar, 255)
29 ADAPTER_PROPERTY(Direction , SkScalar, 0)
30 ADAPTER_PROPERTY(Distance , SkScalar, 0)
31 ADAPTER_PROPERTY(Softness , SkScalar, 0)
32 ADAPTER_PROPERTY(ShadowOnly, bool , false)
33
34 private:
apply()35 void apply() {
36 // fColor -> RGB, fOpacity -> A
37 fDropShadow->setColor(SkColorSetA(fColor, SkTPin(SkScalarRoundToInt(fOpacity), 0, 255)));
38
39 // The offset is specified in terms of a bearing angle + distance.
40 SkScalar rad = SkDegreesToRadians(90 - fDirection);
41 fDropShadow->setOffset(SkVector::Make( fDistance * SkScalarCos(rad),
42 -fDistance * SkScalarSin(rad)));
43
44 // Close enough to AE.
45 static constexpr SkScalar kSoftnessToSigmaFactor = 0.3f;
46 const auto sigma = fSoftness * kSoftnessToSigmaFactor;
47 fDropShadow->setSigma(SkVector::Make(sigma, sigma));
48
49 fDropShadow->setMode(fShadowOnly ? sksg::DropShadowImageFilter::Mode::kShadowOnly
50 : sksg::DropShadowImageFilter::Mode::kShadowAndForeground);
51 }
52
53 const sk_sp<sksg::DropShadowImageFilter> fDropShadow;
54 };
55
56 } // anonymous ns
57
attachDropShadowEffect(const skjson::ArrayValue & jprops,sk_sp<sksg::RenderNode> layer) const58 sk_sp<sksg::RenderNode> EffectBuilder::attachDropShadowEffect(const skjson::ArrayValue& jprops,
59 sk_sp<sksg::RenderNode> layer) const {
60 enum : size_t {
61 kShadowColor_Index = 0,
62 kOpacity_Index = 1,
63 kDirection_Index = 2,
64 kDistance_Index = 3,
65 kSoftness_Index = 4,
66 kShadowOnly_Index = 5,
67 };
68
69 auto shadow_effect = sksg::DropShadowImageFilter::Make();
70 auto shadow_adapter = sk_make_sp<DropShadowAdapter>(shadow_effect);
71
72 fBuilder->bindProperty<VectorValue>(GetPropValue(jprops, kShadowColor_Index),
73 [shadow_adapter](const VectorValue& c) {
74 shadow_adapter->setColor(ValueTraits<VectorValue>::As<SkColor>(c));
75 });
76 fBuilder->bindProperty<ScalarValue>(GetPropValue(jprops, kOpacity_Index),
77 [shadow_adapter](const ScalarValue& o) {
78 shadow_adapter->setOpacity(o);
79 });
80 fBuilder->bindProperty<ScalarValue>(GetPropValue(jprops, kDirection_Index),
81 [shadow_adapter](const ScalarValue& d) {
82 shadow_adapter->setDirection(d);
83 });
84 fBuilder->bindProperty<ScalarValue>(GetPropValue(jprops, kDistance_Index),
85 [shadow_adapter](const ScalarValue& d) {
86 shadow_adapter->setDistance(d);
87 });
88 fBuilder->bindProperty<ScalarValue>(GetPropValue(jprops, kSoftness_Index),
89 [shadow_adapter](const ScalarValue& s) {
90 shadow_adapter->setSoftness(s);
91 });
92 fBuilder->bindProperty<ScalarValue>(GetPropValue(jprops, kShadowOnly_Index),
93 [shadow_adapter](const ScalarValue& s) {
94 shadow_adapter->setShadowOnly(SkToBool(s));
95 });
96
97 return sksg::ImageFilterEffect::Make(std::move(layer), std::move(shadow_effect));
98 }
99
100 } // namespace internal
101 } // namespace skottie
102