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/Animator.h"
11 #include "modules/skottie/src/SkottieValue.h"
12 #include "modules/sksg/include/SkSGColorFilter.h"
13 #include "src/utils/SkJSON.h"
14
15 namespace skottie {
16 namespace internal {
17
18 namespace {
19
20 class InvertEffectAdapter final : public AnimatablePropertyContainer {
21 public:
Make(const skjson::ArrayValue & jprops,sk_sp<sksg::RenderNode> layer,const AnimationBuilder * abuilder)22 static sk_sp<InvertEffectAdapter> Make(const skjson::ArrayValue& jprops,
23 sk_sp<sksg::RenderNode> layer,
24 const AnimationBuilder* abuilder) {
25 return sk_sp<InvertEffectAdapter>(
26 new InvertEffectAdapter(jprops, std::move(layer), abuilder));
27 }
28
node() const29 const sk_sp<sksg::ExternalColorFilter>& node() const { return fColorFilter; }
30
31 private:
InvertEffectAdapter(const skjson::ArrayValue & jprops,sk_sp<sksg::RenderNode> layer,const AnimationBuilder * abuilder)32 InvertEffectAdapter(const skjson::ArrayValue& jprops,
33 sk_sp<sksg::RenderNode> layer,
34 const AnimationBuilder* abuilder)
35 : fColorFilter(sksg::ExternalColorFilter::Make(std::move(layer))) {
36 enum : size_t {
37 kChannel_Index = 0,
38 };
39
40 this->bind(*abuilder, EffectBuilder::GetPropValue(jprops, kChannel_Index), &fChannel);
41 }
42
onSync()43 void onSync() override {
44 struct STColorMatrix {
45 std::array<float,4> scale,
46 trans;
47 bool hsla;
48 };
49
50 const auto stcm = [this]() -> STColorMatrix {
51 // https://helpx.adobe.com/after-effects/using/channel-effects.html#invert_effect
52 enum : uint8_t {
53 kRGB_Channel = 1,
54 kR_Channel = 2,
55 kG_Channel = 3,
56 kB_Channel = 4,
57
58 // NB: HLS vs. HSL
59 kHLS_Channel = 6,
60 kH_Channel = 7,
61 kL_Channel = 8,
62 kS_Channel = 9,
63
64 // kYIQ_Channel = ?,
65 // kLum_Channel = ?,
66 // kIPC_Channel = ?,
67 // kQAC_Channel = ?,
68
69 kA_Channel = 16,
70 };
71
72 switch (static_cast<uint8_t>(fChannel)) {
73 case kR_Channel: return { {-1, 1, 1, 1}, { 1,0,0,0}, false}; // r' = 1 - r
74 case kG_Channel: return { { 1,-1, 1, 1}, { 0,1,0,0}, false}; // g' = 1 - g
75 case kB_Channel: return { { 1, 1,-1, 1}, { 0,0,1,0}, false}; // b' = 1 - b
76 case kA_Channel: return { { 1, 1, 1,-1}, { 0,0,0,1}, false}; // a' = 1 - a
77 case kRGB_Channel: return { {-1,-1,-1, 1}, { 1,1,1,0}, false};
78
79 case kH_Channel: return { {-1, 1, 1, 1}, {.5f,0,0,0}, true}; // h' = .5 - h
80 case kS_Channel: return { { 1,-1, 1, 1}, { 0,1,0,0}, true}; // s' = 1 - s
81 case kL_Channel: return { { 1, 1,-1, 1}, { 0,0,1,0}, true}; // l' = 1 - l
82 case kHLS_Channel: return { {-1,-1,-1, 1}, {.5f,1,1,0}, true};
83
84 default: return { { 1, 1, 1, 1}, { 0,0,0,0}, false};
85 }
86
87 SkUNREACHABLE;
88 }();
89
90 const float m[] = {
91 stcm.scale[0], 0, 0, 0, stcm.trans[0],
92 0, stcm.scale[1], 0, 0, stcm.trans[1],
93 0, 0, stcm.scale[2], 0, stcm.trans[2],
94 0, 0, 0, stcm.scale[3], stcm.trans[3],
95
96 };
97
98 fColorFilter->setColorFilter(stcm.hsla ? SkColorFilters::HSLAMatrix(m)
99 : SkColorFilters::Matrix(m));
100 }
101
102 const sk_sp<sksg::ExternalColorFilter> fColorFilter;
103
104 float fChannel = 0;
105 };
106
107 } // namespace
108
attachInvertEffect(const skjson::ArrayValue & jprops,sk_sp<sksg::RenderNode> layer) const109 sk_sp<sksg::RenderNode> EffectBuilder::attachInvertEffect(const skjson::ArrayValue& jprops,
110 sk_sp<sksg::RenderNode> layer) const {
111 return fBuilder->attachDiscardableAdapter<InvertEffectAdapter>(jprops,
112 std::move(layer),
113 fBuilder);
114 }
115
116 } // namespace internal
117 } // namespace skottie
118