modules/skottie/src/Transform.cpp

/*
 * Copyright 2020 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/Transform.h"

#include "modules/sksg/include/SkSGTransform.h"

namespace skottie {
namespace internal {

TransformAdapter2D::TransformAdapter2D(sk_sp<sksg::Matrix<SkMatrix>> matrix)
    : fMatrixNode(std::move(matrix)) {}

TransformAdapter2D::~TransformAdapter2D() = default;

SkMatrix TransformAdapter2D::totalMatrix() const {
    SkMatrix t = SkMatrix::MakeTrans(-fAnchorPoint.x(), -fAnchorPoint.y());

    t.postScale(fScale.x() / 100, fScale.y() / 100); // 100% based
    t.postRotate(fRotation);
    t.postTranslate(fPosition.x(), fPosition.y());
    // TODO: skew

    return t;
}

void TransformAdapter2D::apply() {
    fMatrixNode->setMatrix(this->totalMatrix());
}

TransformAdapter3D::Vec3::Vec3(const VectorValue& v) {
    fX = v.size() > 0 ? v[0] : 0;
    fY = v.size() > 1 ? v[1] : 0;
    fZ = v.size() > 2 ? v[2] : 0;
}

TransformAdapter3D::TransformAdapter3D()
    : fMatrixNode(sksg::Matrix<SkMatrix44>::Make(SkMatrix::I())) {}

TransformAdapter3D::~TransformAdapter3D() = default;

sk_sp<sksg::Transform> TransformAdapter3D::refTransform() const {
    return fMatrixNode;
}

SkMatrix44 TransformAdapter3D::totalMatrix() const {
    SkMatrix44 t;

    t.setTranslate(-fAnchorPoint.fX, -fAnchorPoint.fY, -fAnchorPoint.fZ);
    t.postScale(fScale.fX / 100, fScale.fY / 100, fScale.fZ / 100);

    SkMatrix44 r;
    r.setRotateDegreesAbout(0, 0, 1, fRotation.fZ);
    t.postConcat(r);
    r.setRotateDegreesAbout(0, 1, 0, fRotation.fY);
    t.postConcat(r);
    r.setRotateDegreesAbout(1, 0, 0, fRotation.fX);
    t.postConcat(r);

    t.postTranslate(fPosition.fX, fPosition.fY, fPosition.fZ);

    return t;
}

void TransformAdapter3D::apply() {
    fMatrixNode->setMatrix(this->totalMatrix());
}

} // namespace internal
} // namespace skottie