| /* |
| * Copyright 2017 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkottieValue.h" |
| |
| #include "SkColor.h" |
| #include "SkNx.h" |
| #include "SkPoint.h" |
| #include "SkSize.h" |
| |
| namespace skottie { |
| |
| template <> |
| size_t ValueTraits<ScalarValue>::Cardinality(const ScalarValue&) { |
| return 1; |
| } |
| |
| template <> |
| ScalarValue ValueTraits<ScalarValue>::Lerp(const ScalarValue& v0, const ScalarValue& v1, float t) { |
| SkASSERT(t >= 0 && t <= 1); |
| return v0 + (v1 - v0) * t; |
| } |
| |
| template <> |
| template <> |
| SkScalar ValueTraits<ScalarValue>::As<SkScalar>(const ScalarValue& v) { |
| return v; |
| } |
| |
| template <> |
| size_t ValueTraits<VectorValue>::Cardinality(const VectorValue& vec) { |
| return vec.size(); |
| } |
| |
| template <> |
| VectorValue ValueTraits<VectorValue>::Lerp(const VectorValue& v0, const VectorValue& v1, float t) { |
| SkASSERT(v0.size() == v1.size()); |
| |
| VectorValue v; |
| v.reserve(v0.size()); |
| |
| for (size_t i = 0; i < v0.size(); ++i) { |
| v.push_back(ValueTraits<ScalarValue>::Lerp(v0[i], v1[i], t)); |
| } |
| |
| return v; |
| } |
| |
| template <> |
| template <> |
| SkColor ValueTraits<VectorValue>::As<SkColor>(const VectorValue& v) { |
| // best effort to turn this into a color |
| const auto r = v.size() > 0 ? v[0] : 0, |
| g = v.size() > 1 ? v[1] : 0, |
| b = v.size() > 2 ? v[2] : 0, |
| a = v.size() > 3 ? v[3] : 1; |
| |
| return SkColorSetARGB(SkScalarRoundToInt(SkTPin(a, 0.0f, 1.0f) * 255), |
| SkScalarRoundToInt(SkTPin(r, 0.0f, 1.0f) * 255), |
| SkScalarRoundToInt(SkTPin(g, 0.0f, 1.0f) * 255), |
| SkScalarRoundToInt(SkTPin(b, 0.0f, 1.0f) * 255)); |
| } |
| |
| template <> |
| template <> |
| SkPoint ValueTraits<VectorValue>::As<SkPoint>(const VectorValue& vec) { |
| // best effort to turn this into a point |
| const auto x = vec.size() > 0 ? vec[0] : 0, |
| y = vec.size() > 1 ? vec[1] : 0; |
| return SkPoint::Make(x, y); |
| } |
| |
| template <> |
| template <> |
| SkSize ValueTraits<VectorValue>::As<SkSize>(const VectorValue& vec) { |
| const auto pt = ValueTraits::As<SkPoint>(vec); |
| return SkSize::Make(pt.x(), pt.y()); |
| } |
| |
| template <> |
| size_t ValueTraits<ShapeValue>::Cardinality(const ShapeValue& shape) { |
| return shape.fVertices.size(); |
| } |
| |
| static SkPoint lerp_point(const SkPoint& v0, const SkPoint& v1, const Sk2f& t) { |
| const auto v2f0 = Sk2f::Load(&v0), |
| v2f1 = Sk2f::Load(&v1); |
| |
| SkPoint v; |
| (v2f0 + (v2f1 - v2f0) * t).store(&v); |
| |
| return v; |
| } |
| |
| template <> |
| ShapeValue ValueTraits<ShapeValue>::Lerp(const ShapeValue& v0, const ShapeValue& v1, float t) { |
| SkASSERT(t >= 0 && t <= 1); |
| SkASSERT(v0.fVertices.size() == v1.fVertices.size()); |
| SkASSERT(v0.fClosed == v1.fClosed); |
| |
| ShapeValue v; |
| v.fClosed = v0.fClosed; |
| v.fVolatile = true; // interpolated values are volatile |
| |
| const auto t2f = Sk2f(t); |
| v.fVertices.reserve(v0.fVertices.size()); |
| |
| for (size_t i = 0; i < v0.fVertices.size(); ++i) { |
| v.fVertices.emplace_back(BezierVertex({ |
| lerp_point(v0.fVertices[i].fInPoint , v1.fVertices[i].fInPoint , t2f), |
| lerp_point(v0.fVertices[i].fOutPoint, v1.fVertices[i].fOutPoint, t2f), |
| lerp_point(v0.fVertices[i].fVertex , v1.fVertices[i].fVertex , t2f) |
| })); |
| } |
| |
| return v; |
| } |
| |
| template <> |
| template <> |
| SkPath ValueTraits<ShapeValue>::As<SkPath>(const ShapeValue& shape) { |
| SkPath path; |
| |
| if (!shape.fVertices.empty()) { |
| path.moveTo(shape.fVertices.front().fVertex); |
| } |
| |
| const auto& addCubic = [&](size_t from, size_t to) { |
| const auto c0 = shape.fVertices[from].fVertex + shape.fVertices[from].fOutPoint, |
| c1 = shape.fVertices[to].fVertex + shape.fVertices[to].fInPoint; |
| |
| if (c0 == shape.fVertices[from].fVertex && |
| c1 == shape.fVertices[to].fVertex) { |
| // If the control points are coincident, we can power-reduce to a straight line. |
| // TODO: we could also do that when the controls are on the same line as the |
| // vertices, but it's unclear how common that case is. |
| path.lineTo(shape.fVertices[to].fVertex); |
| } else { |
| path.cubicTo(c0, c1, shape.fVertices[to].fVertex); |
| } |
| }; |
| |
| for (size_t i = 1; i < shape.fVertices.size(); ++i) { |
| addCubic(i - 1, i); |
| } |
| |
| if (!shape.fVertices.empty() && shape.fClosed) { |
| addCubic(shape.fVertices.size() - 1, 0); |
| path.close(); |
| } |
| |
| path.setIsVolatile(shape.fVolatile); |
| |
| return path; |
| } |
| |
| } // namespace skottie |