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 "include/core/SkColor.h"
9 #include "include/core/SkPoint.h"
10 #include "include/core/SkRefCnt.h"
11 #include "include/core/SkScalar.h"
12 #include "include/private/base/SkTPin.h"
13 #include "include/private/base/SkTo.h"
14 #include "modules/skottie/src/SkottiePriv.h"
15 #include "modules/skottie/src/SkottieValue.h"
16 #include "modules/skottie/src/animator/Animator.h"
17 #include "modules/skottie/src/effects/Effects.h"
18 #include "modules/sksg/include/SkSGRenderEffect.h"
19 #include "modules/sksg/include/SkSGRenderNode.h"
20
21 #include <cstddef>
22 #include <utility>
23
24 namespace skjson {
25 class ArrayValue;
26 }
27
28 namespace skottie {
29 namespace internal {
30
31 namespace {
32
33 class DropShadowAdapter final : public AnimatablePropertyContainer {
34 public:
Make(const skjson::ArrayValue & jprops,sk_sp<sksg::RenderNode> layer,const AnimationBuilder & abuilder)35 static sk_sp<DropShadowAdapter> Make(const skjson::ArrayValue& jprops,
36 sk_sp<sksg::RenderNode> layer,
37 const AnimationBuilder& abuilder) {
38 enum : size_t {
39 kShadowColor_Index = 0,
40 kOpacity_Index = 1,
41 kDirection_Index = 2,
42 kDistance_Index = 3,
43 kSoftness_Index = 4,
44 kShadowOnly_Index = 5,
45 };
46
47 sk_sp<DropShadowAdapter> adapter(new DropShadowAdapter(std::move(layer)));
48
49 EffectBinder(jprops, abuilder, adapter.get())
50 .bind(kShadowColor_Index, adapter->fColor )
51 .bind( kOpacity_Index, adapter->fOpacity )
52 .bind( kDirection_Index, adapter->fDirection)
53 .bind( kDistance_Index, adapter->fDistance )
54 .bind( kSoftness_Index, adapter->fSoftness )
55 .bind( kShadowOnly_Index, adapter->fShdwOnly );
56
57 return adapter;
58 }
59
node() const60 const sk_sp<sksg::RenderNode>& node() const { return fImageFilterEffect; }
61
62 private:
DropShadowAdapter(sk_sp<sksg::RenderNode> layer)63 explicit DropShadowAdapter(sk_sp<sksg::RenderNode> layer)
64 : fDropShadow(sksg::DropShadowImageFilter::Make())
65 , fImageFilterEffect(sksg::ImageFilterEffect::Make(std::move(layer), fDropShadow)) {}
66
onSync()67 void onSync() override {
68 // fColor -> RGB, fOpacity -> A
69 const SkColor color = fColor;
70 fDropShadow->setColor(SkColorSetA(color, SkTPin(SkScalarRoundToInt(fOpacity), 0, 255)));
71
72 // The offset is specified in terms of a bearing + distance.
73 const auto rad = SkDegreesToRadians(90 - fDirection);
74 fDropShadow->setOffset(SkVector::Make( fDistance * SkScalarCos(rad),
75 -fDistance * SkScalarSin(rad)));
76
77 const auto sigma = fSoftness * kBlurSizeToSigma;
78 fDropShadow->setSigma(SkVector::Make(sigma, sigma));
79
80 fDropShadow->setMode(SkToBool(fShdwOnly)
81 ? sksg::DropShadowImageFilter::Mode::kShadowOnly
82 : sksg::DropShadowImageFilter::Mode::kShadowAndForeground);
83 }
84
85 const sk_sp<sksg::DropShadowImageFilter> fDropShadow;
86 const sk_sp<sksg::RenderNode> fImageFilterEffect;
87
88 ColorValue fColor = { 0, 0, 0, 1 };
89 ScalarValue fOpacity = 255,
90 fDirection = 0,
91 fDistance = 0,
92 fSoftness = 0,
93 fShdwOnly = 0;
94 };
95
96 } // namespace
97
attachDropShadowEffect(const skjson::ArrayValue & jprops,sk_sp<sksg::RenderNode> layer) const98 sk_sp<sksg::RenderNode> EffectBuilder::attachDropShadowEffect(const skjson::ArrayValue& jprops,
99 sk_sp<sksg::RenderNode> layer) const {
100 return fBuilder->attachDiscardableAdapter<DropShadowAdapter>(jprops,
101 std::move(layer),
102 *fBuilder);
103 }
104
105 } // namespace internal
106 } // namespace skottie
107