[skottie] Add support for invert/YIQ
The Invert layer effect [1] also supports YIQ selectors [2]: -- YIQ -- Luminance (Y) -- In Phase Chrominance (I) -- Quadrature Chrominance (Q) [1] https://helpx.adobe.com/after-effects/using/channel-effects.html#invert_effect [2] https://en.wikipedia.org/wiki/YIQ Change-Id: I54b1c81a786ff6f2bdea6456b45b435b2c0fea07 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/316446 Commit-Queue: Florin Malita <fmalita@chromium.org> Commit-Queue: Florin Malita <fmalita@google.com> Reviewed-by: Mike Reed <reed@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
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@ -88,6 +88,7 @@ public:
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// A version of Matrix which operates in HSLA space instead of RGBA.
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// I.e. HSLA-to-RGBA(Matrix(RGBA-to-HSLA(input))).
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static sk_sp<SkColorFilter> HSLAMatrix(const SkColorMatrix&);
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static sk_sp<SkColorFilter> HSLAMatrix(const float rowMajor[20]);
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static sk_sp<SkColorFilter> LinearToSRGBGamma();
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@ -7,6 +7,7 @@
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#include "modules/skottie/src/effects/Effects.h"
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#include "include/effects/SkColorMatrix.h"
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#include "modules/skottie/src/SkottieValue.h"
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#include "modules/sksg/include/SkSGColorFilter.h"
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#include "src/utils/SkJSON.h"
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@ -40,10 +41,12 @@ private:
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}
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void onSync() override {
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enum class CS { kRGB, kHSL, kYIQ };
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struct STColorMatrix {
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std::array<float,4> scale,
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trans;
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bool hsla;
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CS cs;
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};
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const auto stcm = [this]() -> STColorMatrix {
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@ -60,42 +63,66 @@ private:
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kL_Channel = 8,
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kS_Channel = 9,
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// kYIQ_Channel = ?,
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// kLum_Channel = ?,
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// kIPC_Channel = ?,
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// kQAC_Channel = ?,
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kYIQ_Channel = 11,
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kY_Channel = 12,
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kI_Channel = 13,
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kQ_Channel = 14,
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kA_Channel = 16,
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};
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switch (static_cast<uint8_t>(fChannel)) {
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case kR_Channel: return { {-1, 1, 1, 1}, { 1,0,0,0}, false}; // r' = 1 - r
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case kG_Channel: return { { 1,-1, 1, 1}, { 0,1,0,0}, false}; // g' = 1 - g
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case kB_Channel: return { { 1, 1,-1, 1}, { 0,0,1,0}, false}; // b' = 1 - b
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case kA_Channel: return { { 1, 1, 1,-1}, { 0,0,0,1}, false}; // a' = 1 - a
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case kRGB_Channel: return { {-1,-1,-1, 1}, { 1,1,1,0}, false};
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case kR_Channel: return { {-1, 1, 1, 1}, { 1,0,0,0}, CS::kRGB }; // r' = 1 - r
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case kG_Channel: return { { 1,-1, 1, 1}, { 0,1,0,0}, CS::kRGB }; // g' = 1 - g
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case kB_Channel: return { { 1, 1,-1, 1}, { 0,0,1,0}, CS::kRGB }; // b' = 1 - b
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case kA_Channel: return { { 1, 1, 1,-1}, { 0,0,0,1}, CS::kRGB }; // a' = 1 - a
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case kRGB_Channel: return { {-1,-1,-1, 1}, { 1,1,1,0}, CS::kRGB };
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case kH_Channel: return { {-1, 1, 1, 1}, {.5f,0,0,0}, true}; // h' = .5 - h
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case kS_Channel: return { { 1,-1, 1, 1}, { 0,1,0,0}, true}; // s' = 1 - s
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case kL_Channel: return { { 1, 1,-1, 1}, { 0,0,1,0}, true}; // l' = 1 - l
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case kHLS_Channel: return { {-1,-1,-1, 1}, {.5f,1,1,0}, true};
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case kH_Channel: return { {-1, 1, 1, 1}, {.5f,0,0,0}, CS::kHSL }; // h' = .5 - h
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case kS_Channel: return { { 1,-1, 1, 1}, { 0,1,0,0}, CS::kHSL }; // s' = 1 - s
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case kL_Channel: return { { 1, 1,-1, 1}, { 0,0,1,0}, CS::kHSL }; // l' = 1 - l
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case kHLS_Channel: return { {-1,-1,-1, 1}, {.5f,1,1,0}, CS::kHSL };
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default: return { { 1, 1, 1, 1}, { 0,0,0,0}, false};
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case kY_Channel: return { {-1, 1, 1, 1}, { 1,0,0,0}, CS::kYIQ }; // y' = 1 - y
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case kI_Channel: return { { 1,-1, 1, 1}, { 0,0,0,0}, CS::kYIQ }; // i' = -i
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case kQ_Channel: return { { 1, 1,-1, 1}, { 0,0,0,0}, CS::kYIQ }; // q' = -q
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case kYIQ_Channel: return { {-1,-1,-1, 1}, { 1,0,0,0}, CS::kYIQ };
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default: return { { 1, 1, 1, 1}, { 0,0,0,0}, CS::kRGB };
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}
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SkUNREACHABLE;
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}();
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const float m[] = {
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SkColorMatrix m(
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stcm.scale[0], 0, 0, 0, stcm.trans[0],
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0, stcm.scale[1], 0, 0, stcm.trans[1],
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0, 0, stcm.scale[2], 0, stcm.trans[2],
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0, 0, 0, stcm.scale[3], stcm.trans[3],
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0, 0, 0, stcm.scale[3], stcm.trans[3]
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};
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);
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fColorFilter->setColorFilter(stcm.hsla ? SkColorFilters::HSLAMatrix(m)
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: SkColorFilters::Matrix(m));
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if (stcm.cs == CS::kYIQ) {
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// https://en.wikipedia.org/wiki/YIQ
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static constexpr SkColorMatrix RGB2YIQ(
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0.2990f, 0.5870f, 0.1140f, 0, 0,
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0.5959f, -0.2746f, -0.3213f, 0, 0,
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0.2115f, -0.5227f, 0.3112f, 0, 0,
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0, 0, 0, 1, 0
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);
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static constexpr SkColorMatrix YIQ2RGB(
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1, 0.9560f, 0.6190f, 0, 0,
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1, -0.2720f, -0.6470f, 0, 0,
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1, -1.1060f, 1.7030f, 0, 0,
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0, 0, 0, 1, 0
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);
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m.preConcat (RGB2YIQ);
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m.postConcat(YIQ2RGB);
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}
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fColorFilter->setColorFilter(stcm.cs == CS::kHSL ? SkColorFilters::HSLAMatrix(m)
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: SkColorFilters::Matrix(m));
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}
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const sk_sp<sksg::ExternalColorFilter> fColorFilter;
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1
resources/skottie/skottie-invert-effect-yiq.json
Normal file
1
resources/skottie/skottie-invert-effect-yiq.json
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@ -173,6 +173,10 @@ sk_sp<SkColorFilter> SkColorFilters::HSLAMatrix(const float array[20]) {
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return MakeMatrix(array, SkColorFilter_Matrix::Domain::kHSLA);
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}
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sk_sp<SkColorFilter> SkColorFilters::HSLAMatrix(const SkColorMatrix& cm) {
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return MakeMatrix(cm.fMat.data(), SkColorFilter_Matrix::Domain::kHSLA);
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}
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void SkColorFilter_Matrix::RegisterFlattenables() {
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SK_REGISTER_FLATTENABLE(SkColorFilter_Matrix);
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