110 строки
2.5 KiB
C++
110 строки
2.5 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates.
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// This source code is licensed under the MIT license found in the
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// LICENSE file in the root directory of this source tree.
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#pragma once
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#include <array>
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#include <folly/Hash.h>
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#include <react/graphics/Float.h>
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#include <react/graphics/Geometry.h>
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namespace facebook {
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namespace react {
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/*
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* Defines transform matrix to apply affine transformations.
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*/
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struct Transform {
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std::array<Float, 16> matrix{
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{1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}};
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/*
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* Returns the identity transform (`[1 0 0 0; 0 1 0 0; 0 0 1 0; 0 0 0 1]`).
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*/
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static Transform Identity();
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/*
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* Returns a Perspective transform.
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*/
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static Transform Perspective(Float perspective);
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/*
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* Returns a Scale transform.
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*/
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static Transform Scale(Float factorX, Float factorY, Float factorZ);
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/*
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* Returns a Translate transform.
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*/
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static Transform Translate(Float x, Float y, Float z);
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/*
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* Returns a Skew transform.
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*/
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static Transform Skew(Float x, Float y);
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/*
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* Returns a transform that rotates by `angle` radians along the given axis.
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*/
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static Transform RotateX(Float angle);
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static Transform RotateY(Float angle);
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static Transform RotateZ(Float angle);
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static Transform Rotate(Float angleX, Float angleY, Float angleZ);
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/*
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* Equality operators.
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*/
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bool operator==(Transform const &rhs) const;
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bool operator!=(Transform const &rhs) const;
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/*
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* Matrix subscript.
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*/
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Float &at(int x, int y);
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Float const &at(int x, int y) const;
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/*
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* Concatenates (multiplies) transform matrices.
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*/
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Transform operator*(Transform const &rhs) const;
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};
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/*
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* Applies tranformation to the given point.
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*/
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Point operator*(Point const &point, Transform const &transform);
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} // namespace react
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} // namespace facebook
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namespace std {
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template <>
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struct hash<facebook::react::Transform> {
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size_t operator()(const facebook::react::Transform &transform) const {
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return folly::hash::hash_combine(
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0,
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transform.matrix[0],
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transform.matrix[1],
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transform.matrix[2],
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transform.matrix[3],
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transform.matrix[4],
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transform.matrix[5],
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transform.matrix[6],
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transform.matrix[7],
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transform.matrix[8],
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transform.matrix[9],
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transform.matrix[10],
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transform.matrix[11],
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transform.matrix[12],
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transform.matrix[13],
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transform.matrix[14],
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transform.matrix[15]);
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}
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};
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} // namespace std
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