| /* |
| * Copyright 2019 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "modules/skottie/src/effects/Effects.h" |
| |
| #include "include/effects/SkColorMatrix.h" |
| #include "modules/skottie/src/SkottieValue.h" |
| #include "modules/sksg/include/SkSGColorFilter.h" |
| #include "src/utils/SkJSON.h" |
| |
| namespace skottie { |
| namespace internal { |
| |
| namespace { |
| |
| class InvertEffectAdapter final : public AnimatablePropertyContainer { |
| public: |
| static sk_sp<InvertEffectAdapter> Make(const skjson::ArrayValue& jprops, |
| sk_sp<sksg::RenderNode> layer, |
| const AnimationBuilder* abuilder) { |
| return sk_sp<InvertEffectAdapter>( |
| new InvertEffectAdapter(jprops, std::move(layer), abuilder)); |
| } |
| |
| const sk_sp<sksg::ExternalColorFilter>& node() const { return fColorFilter; } |
| |
| private: |
| InvertEffectAdapter(const skjson::ArrayValue& jprops, |
| sk_sp<sksg::RenderNode> layer, |
| const AnimationBuilder* abuilder) |
| : fColorFilter(sksg::ExternalColorFilter::Make(std::move(layer))) { |
| enum : size_t { |
| kChannel_Index = 0, |
| }; |
| |
| EffectBinder(jprops, *abuilder, this).bind(kChannel_Index, fChannel); |
| } |
| |
| void onSync() override { |
| enum class CS { kRGB, kHSL, kYIQ }; |
| |
| struct STColorMatrix { |
| std::array<float,4> scale, |
| trans; |
| CS cs; |
| }; |
| |
| const auto stcm = [this]() -> STColorMatrix { |
| // https://helpx.adobe.com/after-effects/using/channel-effects.html#invert_effect |
| enum : uint8_t { |
| kRGB_Channel = 1, |
| kR_Channel = 2, |
| kG_Channel = 3, |
| kB_Channel = 4, |
| |
| // NB: HLS vs. HSL |
| kHLS_Channel = 6, |
| kH_Channel = 7, |
| kL_Channel = 8, |
| kS_Channel = 9, |
| |
| kYIQ_Channel = 11, |
| kY_Channel = 12, |
| kI_Channel = 13, |
| kQ_Channel = 14, |
| |
| kA_Channel = 16, |
| }; |
| |
| switch (static_cast<uint8_t>(fChannel)) { |
| case kR_Channel: return { {-1, 1, 1, 1}, { 1,0,0,0}, CS::kRGB }; // r' = 1 - r |
| case kG_Channel: return { { 1,-1, 1, 1}, { 0,1,0,0}, CS::kRGB }; // g' = 1 - g |
| case kB_Channel: return { { 1, 1,-1, 1}, { 0,0,1,0}, CS::kRGB }; // b' = 1 - b |
| case kA_Channel: return { { 1, 1, 1,-1}, { 0,0,0,1}, CS::kRGB }; // a' = 1 - a |
| case kRGB_Channel: return { {-1,-1,-1, 1}, { 1,1,1,0}, CS::kRGB }; |
| |
| case kH_Channel: return { {-1, 1, 1, 1}, {.5f,0,0,0}, CS::kHSL }; // h' = .5 - h |
| case kS_Channel: return { { 1,-1, 1, 1}, { 0,1,0,0}, CS::kHSL }; // s' = 1 - s |
| case kL_Channel: return { { 1, 1,-1, 1}, { 0,0,1,0}, CS::kHSL }; // l' = 1 - l |
| case kHLS_Channel: return { {-1,-1,-1, 1}, {.5f,1,1,0}, CS::kHSL }; |
| |
| case kY_Channel: return { {-1, 1, 1, 1}, { 1,0,0,0}, CS::kYIQ }; // y' = 1 - y |
| case kI_Channel: return { { 1,-1, 1, 1}, { 0,0,0,0}, CS::kYIQ }; // i' = -i |
| case kQ_Channel: return { { 1, 1,-1, 1}, { 0,0,0,0}, CS::kYIQ }; // q' = -q |
| case kYIQ_Channel: return { {-1,-1,-1, 1}, { 1,0,0,0}, CS::kYIQ }; |
| |
| default: return { { 1, 1, 1, 1}, { 0,0,0,0}, CS::kRGB }; |
| } |
| |
| SkUNREACHABLE; |
| }(); |
| |
| SkColorMatrix m( |
| stcm.scale[0], 0, 0, 0, stcm.trans[0], |
| 0, stcm.scale[1], 0, 0, stcm.trans[1], |
| 0, 0, stcm.scale[2], 0, stcm.trans[2], |
| 0, 0, 0, stcm.scale[3], stcm.trans[3] |
| |
| ); |
| |
| if (stcm.cs == CS::kYIQ) { |
| // https://en.wikipedia.org/wiki/YIQ |
| static constexpr SkColorMatrix RGB2YIQ( |
| 0.2990f, 0.5870f, 0.1140f, 0, 0, |
| 0.5959f, -0.2746f, -0.3213f, 0, 0, |
| 0.2115f, -0.5227f, 0.3112f, 0, 0, |
| 0, 0, 0, 1, 0 |
| ); |
| static constexpr SkColorMatrix YIQ2RGB( |
| 1, 0.9560f, 0.6190f, 0, 0, |
| 1, -0.2720f, -0.6470f, 0, 0, |
| 1, -1.1060f, 1.7030f, 0, 0, |
| 0, 0, 0, 1, 0 |
| ); |
| |
| m.preConcat (RGB2YIQ); |
| m.postConcat(YIQ2RGB); |
| } |
| |
| fColorFilter->setColorFilter(stcm.cs == CS::kHSL ? SkColorFilters::HSLAMatrix(m) |
| : SkColorFilters::Matrix(m)); |
| } |
| |
| const sk_sp<sksg::ExternalColorFilter> fColorFilter; |
| |
| float fChannel = 0; |
| }; |
| |
| } // namespace |
| |
| sk_sp<sksg::RenderNode> EffectBuilder::attachInvertEffect(const skjson::ArrayValue& jprops, |
| sk_sp<sksg::RenderNode> layer) const { |
| return fBuilder->attachDiscardableAdapter<InvertEffectAdapter>(jprops, |
| std::move(layer), |
| fBuilder); |
| } |
| |
| } // namespace internal |
| } // namespace skottie |