/* * 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/core/SkCanvas.h" #include "include/core/SkPictureRecorder.h" #include "include/core/SkShader.h" #include "include/effects/SkGradientShader.h" #include "modules/skottie/src/SkottieValue.h" #include "modules/sksg/include/SkSGRenderNode.h" #include "src/utils/SkJSON.h" #include namespace skottie { namespace internal { namespace { // AE motion tile effect semantics // (https://helpx.adobe.com/after-effects/using/stylize-effects.html#motion_tile_effect): // // - the full content of the layer is mapped to a tile: tile_center, tile_width, tile_height // // - tiles are repeated in both dimensions to fill the output area: output_width, output_height // // - tiling mode is either kRepeat (default) or kMirror (when mirror_edges == true) // // - for a non-zero phase, alternating vertical columns (every other column) are offset by // the specified amount // // - when horizontal_phase is true, the phase is applied to horizontal rows instead of columns // class TileRenderNode final : public sksg::CustomRenderNode { public: TileRenderNode(const SkSize& size, sk_sp layer) : INHERITED({std::move(layer)}) , fLayerSize(size) {} SG_ATTRIBUTE(TileCenter , SkPoint , fTileCenter ) SG_ATTRIBUTE(TileWidth , SkScalar, fTileW ) SG_ATTRIBUTE(TileHeight , SkScalar, fTileH ) SG_ATTRIBUTE(OutputWidth , SkScalar, fOutputW ) SG_ATTRIBUTE(OutputHeight , SkScalar, fOutputH ) SG_ATTRIBUTE(Phase , SkScalar, fPhase ) SG_ATTRIBUTE(MirrorEdges , bool , fMirrorEdges ) SG_ATTRIBUTE(HorizontalPhase, bool , fHorizontalPhase) protected: const RenderNode* onNodeAt(const SkPoint&) const override { return nullptr; } // no hit-testing SkRect onRevalidate(sksg::InvalidationController* ic, const SkMatrix& ctm) override { // Re-record the layer picture if needed. if (!fLayerPicture || this->hasChildrenInval()) { SkASSERT(this->children().size() == 1ul); const auto& layer = this->children()[0]; layer->revalidate(ic, ctm); SkPictureRecorder recorder; layer->render(recorder.beginRecording(fLayerSize.width(), fLayerSize.height())); fLayerPicture = recorder.finishRecordingAsPicture(); } // tileW and tileH use layer size percentage units. const auto tileW = SkTPin(fTileW, 0.0f, 100.0f) * 0.01f * fLayerSize.width(), tileH = SkTPin(fTileH, 0.0f, 100.0f) * 0.01f * fLayerSize.height(); const auto tile_size = SkSize::Make(std::max(tileW, 1.0f), std::max(tileH, 1.0f)); const auto tile = SkRect::MakeXYWH(fTileCenter.fX - 0.5f * tile_size.width(), fTileCenter.fY - 0.5f * tile_size.height(), tile_size.width(), tile_size.height()); const auto layerShaderMatrix = SkMatrix::MakeRectToRect( SkRect::MakeWH(fLayerSize.width(), fLayerSize.height()), tile, SkMatrix::kFill_ScaleToFit); const auto tm = fMirrorEdges ? SkTileMode::kMirror : SkTileMode::kRepeat; auto layer_shader = fLayerPicture->makeShader(tm, tm, &layerShaderMatrix); if (fPhase) { // To implement AE phase semantics, we construct a mask shader for the pass-through // rows/columns. We then draw the layer content through this mask, and then again // through the inverse mask with a phase shift. const auto phase_vec = fHorizontalPhase ? SkVector::Make(tile.width(), 0) : SkVector::Make(0, tile.height()); const auto phase_shift = SkVector::Make(phase_vec.fX / layerShaderMatrix.getScaleX(), phase_vec.fY / layerShaderMatrix.getScaleY()) * std::fmod(fPhase * (1/360.0f), 1); const auto phase_shader_matrix = SkMatrix::MakeTrans(phase_shift.x(), phase_shift.y()); // The mask is generated using a step gradient shader, spanning 2 x tile width/height, // and perpendicular to the phase vector. static constexpr SkColor colors[] = { 0xffffffff, 0x00000000 }; static constexpr SkScalar pos[] = { 0.5f, 0.5f }; const SkPoint pts[] = {{ tile.x(), tile.y() }, { tile.x() + 2 * (tile.width() - phase_vec.fX), tile.y() + 2 * (tile.height() - phase_vec.fY) }}; auto mask_shader = SkGradientShader::MakeLinear(pts, colors, pos, SK_ARRAY_COUNT(colors), SkTileMode::kRepeat); // First drawing pass: in-place masked layer content. fMainPassShader = SkShaders::Blend(SkBlendMode::kSrcIn , mask_shader, layer_shader); // Second pass: phased-shifted layer content, with an inverse mask. fPhasePassShader = SkShaders::Blend(SkBlendMode::kSrcOut, mask_shader, layer_shader, &phase_shader_matrix); } else { fMainPassShader = std::move(layer_shader); fPhasePassShader = nullptr; } // outputW and outputH also use layer size percentage units. const auto outputW = fOutputW * 0.01f * fLayerSize.width(), outputH = fOutputH * 0.01f * fLayerSize.height(); return SkRect::MakeXYWH((fLayerSize.width() - outputW) * 0.5f, (fLayerSize.height() - outputH) * 0.5f, outputW, outputH); } void onRender(SkCanvas* canvas, const RenderContext* ctx) const override { // AE allow one of the tile dimensions to collapse, but not both. if (this->bounds().isEmpty() || (fTileW <= 0 && fTileH <= 0)) { return; } SkPaint paint; paint.setAntiAlias(true); paint.setShader(fMainPassShader); canvas->drawRect(this->bounds(), paint); if (fPhasePassShader) { paint.setShader(fPhasePassShader); canvas->drawRect(this->bounds(), paint); } } private: const SkSize fLayerSize; SkPoint fTileCenter = { 0, 0 }; SkScalar fTileW = 1, fTileH = 1, fOutputW = 1, fOutputH = 1, fPhase = 0; bool fMirrorEdges = false; bool fHorizontalPhase = false; // These are computed/cached on revalidation. sk_sp fLayerPicture; // cached picture for layer content sk_sp fMainPassShader, // shader for the main tile(s) fPhasePassShader; // shader for the phased tile(s) using INHERITED = sksg::CustomRenderNode; }; } // anonymous ns sk_sp EffectBuilder::attachMotionTileEffect(const skjson::ArrayValue& jprops, sk_sp layer) const { enum : size_t { kTileCenter_Index = 0, kTileWidth_Index = 1, kTileHeight_Index = 2, kOutputWidth_Index = 3, kOutputHeight_Index = 4, kMirrorEdges_Index = 5, kPhase_Index = 6, kHorizontalPhaseShift_Index = 7, }; auto tiler = sk_make_sp(fLayerSize, std::move(layer)); fBuilder->bindProperty(GetPropValue(jprops, kTileCenter_Index), [tiler](const VectorValue& tc) { tiler->setTileCenter(ValueTraits::As(tc)); }); fBuilder->bindProperty(GetPropValue(jprops, kTileWidth_Index), [tiler](const ScalarValue& tw) { tiler->setTileWidth(tw); }); fBuilder->bindProperty(GetPropValue(jprops, kTileHeight_Index), [tiler](const ScalarValue& th) { tiler->setTileHeight(th); }); fBuilder->bindProperty(GetPropValue(jprops, kOutputWidth_Index), [tiler](const ScalarValue& ow) { tiler->setOutputWidth(ow); }); fBuilder->bindProperty(GetPropValue(jprops, kOutputHeight_Index), [tiler](const ScalarValue& oh) { tiler->setOutputHeight(oh); }); fBuilder->bindProperty(GetPropValue(jprops, kMirrorEdges_Index), [tiler](const ScalarValue& me) { tiler->setMirrorEdges(SkScalarRoundToInt(me)); }); fBuilder->bindProperty(GetPropValue(jprops, kPhase_Index), [tiler](const ScalarValue& ph) { tiler->setPhase(ph); }); fBuilder->bindProperty(GetPropValue(jprops, kHorizontalPhaseShift_Index), [tiler](const ScalarValue& hp) { tiler->setHorizontalPhase(SkScalarRoundToInt(hp)); }); return tiler; } } // namespace internal } // namespace skottie