editTarget.h

//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_USD_USD_EDIT_TARGET_H
#define PXR_USD_USD_EDIT_TARGET_H

#include "pxr/pxr.h"
#include "pxr/usd/usd/api.h"
#include "pxr/usd/pcp/layerStackIdentifier.h"
#include "pxr/usd/pcp/mapFunction.h"
#include "pxr/usd/pcp/node.h"
#include "pxr/usd/sdf/layer.h"
#include "pxr/usd/sdf/path.h"
#include "pxr/usd/sdf/primSpec.h"

PXR_NAMESPACE_OPEN_SCOPE


TF_DECLARE_WEAK_PTRS(UsdStage);

class UsdEditTarget
{
public:

    USD_API
    UsdEditTarget();

    USD_API
    UsdEditTarget(const SdfLayerHandle &layer,
                  SdfLayerOffset offset = SdfLayerOffset());

    USD_API
    UsdEditTarget(const SdfLayerRefPtr &layer,
                  SdfLayerOffset offset = SdfLayerOffset());

    USD_API
    UsdEditTarget(const SdfLayerHandle &layer, const PcpNodeRef &node);

    USD_API
    UsdEditTarget(const SdfLayerRefPtr &layer, const PcpNodeRef &node);

    USD_API
    static UsdEditTarget
    ForLocalDirectVariant(const SdfLayerHandle &layer,
                          const SdfPath &varSelPath);

    USD_API
    bool operator==(const UsdEditTarget &other) const;

    bool operator!=(const UsdEditTarget &other) const {
        return !(*this == other);
    }

    bool IsNull() const { return *this == UsdEditTarget(); }

    bool IsValid() const { return _layer; }

    const SdfLayerHandle &GetLayer() const & { return _layer; }
    SdfLayerHandle GetLayer() && { return std::move(_layer); }

    USD_API
    SdfPath MapToSpecPath(const SdfPath &scenePath) const;

    USD_API
    SdfPrimSpecHandle
    GetPrimSpecForScenePath(const SdfPath &scenePath) const;

    USD_API
    SdfPropertySpecHandle
    GetPropertySpecForScenePath(const SdfPath &scenePath) const;

    USD_API
    SdfSpecHandle
    GetSpecForScenePath(const SdfPath &scenePath) const;

    const PcpMapFunction &
    GetMapFunction() const { return _mapping; }

    USD_API
    UsdEditTarget ComposeOver(const UsdEditTarget &weaker) const;

private:

    UsdEditTarget(const SdfLayerHandle &layer,
                  const PcpMapFunction &mapping);

    SdfLayerHandle _layer;
    PcpMapFunction _mapping;
};


PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_USD_EDIT_TARGET_H