XUSD_Data.h

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/*
 * Copyright 2019 Side Effects Software Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef __HUSD_Data_h__
#define __HUSD_Data_h__

#include "HUSD_API.h"
#include "HUSD_DataHandle.h"
#include "XUSD_DataLock.h"
#include "HUSD_Overrides.h"
#include "XUSD_PathSet.h"
#include "XUSD_Ticket.h"
#include <UT/UT_Color.h>
#include <UT/UT_StringArray.h>
#include <UT/UT_StringHolder.h>
#include <UT/UT_StringSet.h>
#include <UT/UT_IntrusivePtr.h>
#include <UT/UT_SharedPtr.h>
#include <UT/UT_UniquePtr.h>
#include <pxr/usd/usd/stage.h>
#include <pxr/usd/usd/stageLoadRules.h>
#include <pxr/usd/usd/stagePopulationMask.h>
#include <pxr/usd/sdf/path.h>

PXR_NAMESPACE_OPEN_SCOPE

enum XUSD_AddLayerOp
{
    XUSD_ADD_LAYER_LOCKED,
    XUSD_ADD_LAYER_EDITABLE,
};

class XUSD_LayerAtPath
{
public:
                         XUSD_LayerAtPath();
    explicit             XUSD_LayerAtPath(const SdfLayerRefPtr &layer,
                                const SdfLayerOffset &offset = SdfLayerOffset(),
                                int layer_badge_index = 0);
    explicit             XUSD_LayerAtPath(const SdfLayerRefPtr &layer,
                                const std::string &filepath,
                                const SdfLayerOffset &offset = SdfLayerOffset(),
                                int layer_badge_index = 0);

    bool                 hasLayerColorIndex(int &clridx) const;
    bool                 isLayerAnonymous() const;

    SdfLayerRefPtr       myLayer;
    std::string          myIdentifier;
    SdfLayerOffset       myOffset;
    int                  myLayerColorIndex;
    bool                 myRemoveWithLayerBreak;
    bool                 myLayerIsMissingFile;
};

class XUSD_OverridesInfo
{
public:
                         XUSD_OverridesInfo(const UsdStageRefPtr &stage);
                        ~XUSD_OverridesInfo();

    bool                 isEmpty() const
                         { return !myReadOverrides && !myWriteOverrides; }

    HUSD_ConstOverridesPtr       myReadOverrides;
    HUSD_OverridesPtr            myWriteOverrides;
    SdfLayerRefPtr               mySessionLayers[HUSD_OVERRIDES_NUM_LAYERS];
    exint                        myOverridesVersionId;
};

typedef UT_Array<XUSD_LayerAtPath>       XUSD_LayerAtPathArray;

class HUSD_API XUSD_Data : public UT_IntrusiveRefCounter<XUSD_Data>,
                           public UT_NonCopyable
{
public:
                                 XUSD_Data(HUSD_MirroringType mirroring);
                                ~XUSD_Data();

    // Return true if our stage value is set and has a valid root prim.
    bool                         isStageValid() const;
    // Returns our stage. Should only be accessed when this data is locked.
    UsdStageRefPtr               stage() const;
    // Returns the active layer on our composed stage.
    SdfLayerRefPtr               activeLayer() const;
    // Return the on-stage identifiers of any layers that are marked in the
    // source layers array to be removed due to a layer break.
    std::set<std::string>        getStageLayersToRemoveFromLayerBreak() const;
    // Creates a layer by flattening all our source layers together. Also
    // strips out any layers tagged by a Layer Break LOP.
    SdfLayerRefPtr               createFlattenedLayer(
                                        HUSD_StripLayerResponse response) const;
    // Creates a layer by flattening a stage consisting of our source layers
    // after stripping out any layers tagged by a Layer Break LOP.
    SdfLayerRefPtr               createFlattenedStage(
                                        HUSD_StripLayerResponse response) const;

    // Return the array of source layers that are combined to make our stage.
    const XUSD_LayerAtPathArray &sourceLayers() const;
    // Return the current session layer overrides set on our stage.
    const HUSD_ConstOverridesPtr&overrides() const;
    // Return a specific session layer object on our stage.
    const SdfLayerRefPtr        &sessionLayer(HUSD_OverridesLayerId id) const;
    // Return the current load masks set on our stge.
    const HUSD_LoadMasksPtr     &loadMasks() const;
    // Return the identifier of our stage's root layer. This can be used as
    // a quick check as to whether we have create a brand new stage.
    const std::string           &rootLayerIdentifier() const;

    // Add a layer using a file path, layer pointer, or an empty layer.
    // Files and layer pointers can be inserted at any position in the
    // sublayer list (0 is strongest, -1 is weakest). The layer op value
    // indicates whether the layer should be editable, which implies that
    // it must be added to the strongest position (the only place where a
    // layer can be edited).
    bool                         addLayer(const std::string &filepath,
                                        const SdfLayerOffset &offset,
                                        int position,
                                        XUSD_AddLayerOp add_layer_op);
    bool                         addLayer(const XUSD_LayerAtPath &layer,
                                        int position,
                                        XUSD_AddLayerOp add_layer_op);
    bool                         addLayers(const XUSD_LayerAtPathArray &layers);
    bool                         addLayer();
    // Remove one of our source layers.
    bool                         removeLayer(const std::string &filepath);

    // Apply a layer break, which tags all existing layers, and adds a new
    // empty layer for holding future modification.
    bool                         applyLayerBreak();

    // Store a ticket in with this data to keep alive cooked sop data in the
    // XUSD_TicketRegistry as long as it might be referenced by our stage.
    void                         addTicket(const XUSD_TicketPtr &ticket);
    void                         addTickets(const XUSD_TicketArray &tickets);
    const XUSD_TicketArray      &tickets() const;

    // Store pointers to arrays that were created automatically as part of a
    // process of replacing a layer on disk with an anonymous layer.
    void                         addReplacements(
                                        const XUSD_LayerArray &replacements);
    const XUSD_LayerArray       &replacements() const;

    // Store a locked stage with this data to keep alive cooked lop data in the
    // HUSD_LockedStageRegistry as long as it might be referenced by our stage.
    void                         addLockedStage(
                                        const HUSD_LockedStagePtr &stage);
    void                         addLockedStages(
                                        const HUSD_LockedStageArray &stages);
    const HUSD_LockedStageArray &lockedStages() const;

private:
    void                 reset();
    void                 createNewData(const HUSD_LoadMasksPtr &load_masks,
                                int resolver_context_nodeid,
                                const UsdStageWeakPtr &resolver_context_stage,
                                const ArResolverContext *resolver_context);
    void                 createHardCopy(const XUSD_Data &src);
    void                 createSoftCopy(const XUSD_Data &src,
                                const HUSD_LoadMasksPtr &load_masks,
                                bool make_new_implicit_layer);
    void                 createCopyWithReplacement(
                                const XUSD_Data &src,
                                const UT_StringRef &frompath,
                                const UT_StringRef &topath,
                                int nodeid,
                                HUSD_MakeNewPathFunc make_new_path,
                                UT_StringSet &replaced_layers);

    // Return the resolver context for our stage. Note this this method does
    // not require that the stage be locked, becaue it is unchanging data set
    // on the stage when it was created.
    ArResolverContext    resolverContext() const;

    // Return a layer created by flattening all source layers up to the
    // strongest layer excluded by a Layer Break node.
    void                 flattenLayers(const XUSD_Data &src,
                                int creator_node_id);
    // Return a layer created by flattening the stage composed of all source
    // layers up to the strongest layer excluded by a Layer Break node.
    void                 flattenStage(const XUSD_Data &src,
                                int creator_node_id);
    // Utility method used by the two flatten methods above to separate all
    // layers preceding a layer break point. Optionally creates a warning if
    // a layer break is found.
    UsdStageRefPtr       getOrCreateStageForFlattening(
                                HUSD_StripLayerResponse response,
                                UsdStage::InitialLoadSet loadset) const;

    void                 mirror(const XUSD_Data &src,
                                const HUSD_LoadMasks &load_masks);

    void                 afterLock(bool for_write,
                                const HUSD_ConstOverridesPtr
                                    &read_overrides =
                                    HUSD_ConstOverridesPtr(),
                                const HUSD_OverridesPtr
                                    &write_overrides =
                                    HUSD_OverridesPtr(),
                                bool remove_layer_breaks = false);
    XUSD_LayerPtr        editActiveSourceLayer();
    void                 createInitialPlaceholderSublayers();
    void                 afterRelease();

    static void          exitCallback(void *);

    UsdStageRefPtr                       myStage;
    UT_SharedPtr<UT_StringArray>         myStageLayerAssignments;
    UT_SharedPtr<XUSD_LayerArray>        myStageLayers;
    UT_SharedPtr<int>                    myStageLayerCount;
    UT_SharedPtr<XUSD_OverridesInfo>     myOverridesInfo;
    XUSD_LayerAtPathArray                mySourceLayers;
    HUSD_LoadMasksPtr                    myLoadMasks;
    XUSD_DataLockPtr                     myDataLock;
    XUSD_TicketArray                     myTicketArray;
    XUSD_LayerArray                      myReplacementLayerArray;
    HUSD_LockedStageArray                myLockedStages;
    HUSD_MirroringType                   myMirroring;
    UsdStageLoadRules                    myMirrorLoadRules;
    bool                                 myMirrorLoadRulesChanged;
    int                                  myActiveLayerIndex;
    bool                                 myOwnsActiveLayer;

    friend class ::HUSD_DataHandle;
};

class HUSD_API XUSD_Layer : public UT_IntrusiveRefCounter<XUSD_Layer>
{
public:
                                 XUSD_Layer(const SdfLayerRefPtr &layer,
                                         bool create_change_block)
                                     : myLayer(layer),
                                       myChangeBlock(nullptr)
                                 {
                                     if (create_change_block)
                                         myChangeBlock.reset(
                                             new SdfChangeBlock());
                                 }
                                ~XUSD_Layer()
                                 { }

    const SdfLayerRefPtr        &layer() const
                                 { return myLayer; }

private:
    SdfLayerRefPtr               myLayer;
    UT_UniquePtr<SdfChangeBlock> myChangeBlock;
};

PXR_NAMESPACE_CLOSE_SCOPE

#endif