2253c22afb
Parent camera layer transforms apply to the camera itself, thus
T_camera' = T_camera x Inv(T_parent)
To support this composition:
- introduce sksg::Transform::MakeInverse()
- allow selectable pre/post parent composition in
AnimationBuilder::attachMatrix3D()
Change-Id: Ie70b36e4e9bb1b32e60893df5695bdc6c0dc0d00
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/210422
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
118 lines
2.9 KiB
C++
118 lines
2.9 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkSGTransform_DEFINED
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#define SkSGTransform_DEFINED
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#include "modules/sksg/include/SkSGEffectNode.h"
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#include "include/core/SkMatrix.h"
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#include "include/core/SkMatrix44.h"
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namespace sksg {
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/**
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* Transformations base class.
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*/
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class Transform : public Node {
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public:
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// Compose T' = A x B
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static sk_sp<Transform> MakeConcat(sk_sp<Transform> a, sk_sp<Transform> b);
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// T' = Inv(T)
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static sk_sp<Transform> MakeInverse(sk_sp<Transform> t);
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protected:
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Transform();
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virtual bool is44() const = 0;
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virtual SkMatrix asMatrix () const = 0;
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virtual SkMatrix44 asMatrix44() const = 0;
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private:
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friend class TransformPriv;
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using INHERITED = Node;
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};
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/**
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* Concrete, matrix-backed Transform.
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*
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* Supported instantiations: SkMatrix, SkMatrix44.
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*
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* Sample use:
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*
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* auto m33 = Matrix<SkMatrix>::Make(SkMatrix::I());
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* ...
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* m33->setMatrix(SkMatrix::MakeTrans(10, 10));
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*
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*/
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template <typename T>
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class Matrix final : public Transform {
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public:
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template <typename = std::enable_if<std::is_same<T, SkMatrix >::value ||
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std::is_same<T, SkMatrix44>::value>>
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static sk_sp<Matrix> Make(const T& m) { return sk_sp<Matrix>(new Matrix(m)); }
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SG_ATTRIBUTE(Matrix, T, fMatrix)
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protected:
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explicit Matrix(const T& m) : fMatrix(m) {}
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SkRect onRevalidate(InvalidationController*, const SkMatrix&) override {
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return SkRect::MakeEmpty();
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}
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bool is44() const override { return std::is_same<T, SkMatrix44>::value; }
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SkMatrix asMatrix () const override { return fMatrix; }
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SkMatrix44 asMatrix44() const override { return fMatrix; }
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private:
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T fMatrix;
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using INHERITED = Transform;
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};
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/**
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* Concrete Effect node, binding a Transform to a RenderNode.
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*/
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class TransformEffect final : public EffectNode {
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public:
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static sk_sp<TransformEffect> Make(sk_sp<RenderNode> child, sk_sp<Transform> transform) {
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return child && transform
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? sk_sp<TransformEffect>(new TransformEffect(std::move(child), std::move(transform)))
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: nullptr;
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}
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static sk_sp<TransformEffect> Make(sk_sp<RenderNode> child, const SkMatrix& m) {
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return Make(std::move(child), Matrix<SkMatrix>::Make(m));
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}
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~TransformEffect() override;
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const sk_sp<Transform>& getTransform() const { return fTransform; }
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protected:
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void onRender(SkCanvas*, const RenderContext*) const override;
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const RenderNode* onNodeAt(const SkPoint&) const override;
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SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
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private:
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TransformEffect(sk_sp<RenderNode>, sk_sp<Transform>);
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const sk_sp<Transform> fTransform;
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typedef EffectNode INHERITED;
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};
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} // namespace sksg
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#endif // SkSGTransform_DEFINED
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