1 /* 2 * Copyright 2017 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 #ifndef SkSGTransform_DEFINED 9 #define SkSGTransform_DEFINED 10 11 #include "SkSGEffectNode.h" 12 13 #include "SkMatrix.h" 14 15 namespace sksg { 16 17 /** 18 * Concrete node, wrapping an SkMatrix, with an optional parent Matrix (to allow chaining): 19 * 20 * M' = parent x M 21 */ 22 class Matrix : public Node { 23 public: 24 static sk_sp<Matrix> Make(const SkMatrix& m, sk_sp<Matrix> parent = nullptr) { 25 return sk_sp<Matrix>(new Matrix(m, std::move(parent))); 26 } 27 28 ~Matrix() override; 29 30 SG_ATTRIBUTE(Matrix, SkMatrix, fLocalMatrix) 31 32 const SkMatrix& getTotalMatrix() const { return fTotalMatrix; } 33 34 protected: 35 Matrix(const SkMatrix&, sk_sp<Matrix>); 36 37 SkRect onRevalidate(InvalidationController*, const SkMatrix&) override; 38 39 private: 40 sk_sp<Matrix> fParent; 41 SkMatrix fLocalMatrix, 42 fTotalMatrix; // cached during revalidation 43 44 typedef Node INHERITED; 45 }; 46 47 /** 48 * Concrete Effect node, binding a Matrix to a RenderNode. 49 */ 50 class Transform final : public EffectNode { 51 public: 52 static sk_sp<Transform> Make(sk_sp<RenderNode> child, sk_sp<Matrix> matrix) { 53 return child && matrix 54 ? sk_sp<Transform>(new Transform(std::move(child), std::move(matrix))) 55 : nullptr; 56 } 57 58 static sk_sp<Transform> Make(sk_sp<RenderNode> child, const SkMatrix& m) { 59 return Make(std::move(child), Matrix::Make(m)); 60 } 61 62 ~Transform() override; 63 64 const sk_sp<Matrix>& getMatrix() const { return fMatrix; } 65 66 protected: 67 void onRender(SkCanvas*) const override; 68 69 SkRect onRevalidate(InvalidationController*, const SkMatrix&) override; 70 71 private: 72 Transform(sk_sp<RenderNode>, sk_sp<Matrix>); 73 74 const sk_sp<Matrix> fMatrix; 75 76 typedef EffectNode INHERITED; 77 }; 78 79 } // namespace sksg 80 81 #endif // SkSGTransform_DEFINED 82
