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 */
 
 /** @file  Exporter.hpp
 *  @brief Defines the CPP-API for the Assimp export interface
 */
 #pragma once
 #ifndef AI_EXPORT_HPP_INC
 #define AI_EXPORT_HPP_INC
 
 #ifdef __GNUC__
 #pragma GCC system_header
 #endif
 
 #ifndef ASSIMP_BUILD_NO_EXPORT
 
 #include "cexport.h"
 #include <map>
 #include <functional>
 
 namespace Assimp {
 
 class ExporterPimpl;
 class IOSystem;
 class ProgressHandler;
 
 // ----------------------------------------------------------------------------------
 /** CPP-API: The Exporter class forms an C++ interface to the export functionality
  * of the Open Asset Import Library. Note that the export interface is available
  * only if Assimp has been built with ASSIMP_BUILD_NO_EXPORT not defined.
  *
  * The interface is modeled after the importer interface and mostly
  * symmetric. The same rules for threading etc. apply.
  *
  * In a nutshell, there are two export interfaces: #Export, which writes the
  * output file(s) either to the regular file system or to a user-supplied
  * #IOSystem, and #ExportToBlob which returns a linked list of memory
  * buffers (blob), each referring to one output file (in most cases
  * there will be only one output file of course, but this extra complexity is
  * needed since Assimp aims at supporting a wide range of file formats).
  *
  * #ExportToBlob is especially useful if you intend to work
  * with the data in-memory.
 */
 class ASSIMP_API ExportProperties;
 
 class ASSIMP_API Exporter {
 public:
     /** Function pointer type of a Export worker function */
     typedef void (*fpExportFunc)(const char *, IOSystem *, const aiScene *, const ExportProperties *);
 
     /** Internal description of an Assimp export format option */
     struct ExportFormatEntry {
         /// Public description structure to be returned by aiGetExportFormatDescription()
         aiExportFormatDesc mDescription;
 
         // Worker function to do the actual exporting
         fpExportFunc mExportFunction;
 
         // Post-processing steps to be executed PRIOR to invoking mExportFunction
         unsigned int mEnforcePP;
 
         // Constructor to fill all entries
         ExportFormatEntry(const char *pId, const char *pDesc, const char *pExtension, fpExportFunc pFunction, unsigned int pEnforcePP = 0u) {
             mDescription.id = pId;
             mDescription.description = pDesc;
             mDescription.fileExtension = pExtension;
             mExportFunction = pFunction;
             mEnforcePP = pEnforcePP;
         }
 
         ExportFormatEntry() :
                 mExportFunction(),
                 mEnforcePP() {
             mDescription.id = nullptr;
             mDescription.description = nullptr;
             mDescription.fileExtension = nullptr;
         }
     };
 
     /**
      *  @brief  The class constructor.
      */
     Exporter();
 
     /**
     *  @brief  The class destructor.
     */
     ~Exporter();
 
     // -------------------------------------------------------------------
     /** Supplies a custom IO handler to the exporter to use to open and
      * access files.
      *
      * If you need #Export to use custom IO logic to access the files,
      * you need to supply a custom implementation of IOSystem and
      * IOFile to the exporter.
      *
      * #Exporter takes ownership of the object and will destroy it
      * afterwards. The previously assigned handler will be deleted.
      * Pass NULL to take again ownership of your IOSystem and reset Assimp
      * to use its default implementation, which uses plain file IO.
      *
      * @param pIOHandler The IO handler to be used in all file accesses
      *   of the Importer. */
     void SetIOHandler(IOSystem *pIOHandler);
 
     // -------------------------------------------------------------------
     /** Retrieves the IO handler that is currently set.
      * You can use #IsDefaultIOHandler() to check whether the returned
      * interface is the default IO handler provided by ASSIMP. The default
      * handler is active as long the application doesn't supply its own
      * custom IO handler via #SetIOHandler().
      * @return A valid IOSystem interface, never NULL. */
     IOSystem *GetIOHandler() const;
 
     // -------------------------------------------------------------------
     /** Checks whether a default IO handler is active
      * A default handler is active as long the application doesn't
      * supply its own custom IO handler via #SetIOHandler().
      * @return true by default */
     bool IsDefaultIOHandler() const;
 
     // -------------------------------------------------------------------
     /** Supplies a custom progress handler to the exporter. This
      *  interface exposes an #Update() callback, which is called
      *  more or less periodically (please don't sue us if it
      *  isn't as periodically as you'd like it to have ...).
      *  This can be used to implement progress bars and loading
      *  timeouts.
      *  @param pHandler Progress callback interface. Pass nullptr to
      *    disable progress reporting.
      *  @note Progress handlers can be used to abort the loading
      *    at almost any time.*/
     void SetProgressHandler(ProgressHandler *pHandler);
 
     // -------------------------------------------------------------------
     /** Exports the given scene to a chosen file format. Returns the exported
     * data as a binary blob which you can write into a file or something.
     * When you're done with the data, simply let the #Exporter instance go
     * out of scope to have it released automatically.
     * @param pScene The scene to export. Stays in possession of the caller,
     *   is not changed by the function.
     * @param pFormatId ID string to specify to which format you want to
     *   export to. Use
     * #GetExportFormatCount / #GetExportFormatDescription to learn which
     *   export formats are available.
     * @param pPreprocessing See the documentation for #Export
     * @return the exported data or nullptr in case of error.
     * @note If the Exporter instance did already hold a blob from
     *   a previous call to #ExportToBlob, it will be disposed.
     *   Any IO handlers set via #SetIOHandler are ignored here.
     * @note Use aiCopyScene() to get a modifiable copy of a previously
     *   imported scene. */
     const aiExportDataBlob *ExportToBlob(const aiScene *pScene, const char *pFormatId,
             unsigned int pPreprocessing = 0u, const ExportProperties *pProperties = nullptr);
     const aiExportDataBlob *ExportToBlob(const aiScene *pScene, const std::string &pFormatId,
             unsigned int pPreprocessing = 0u, const ExportProperties *pProperties = nullptr);
 
     // -------------------------------------------------------------------
     /** Convenience function to export directly to a file. Use
      *  #SetIOSystem to supply a custom IOSystem to gain fine-grained control
      *  about the output data flow of the export process.
      * @param pBlob A data blob obtained from a previous call to #aiExportScene. Must not be nullptr.
      * @param pPath Full target file name. Target must be accessible.
      * @param pPreprocessing Accepts any choice of the #aiPostProcessSteps enumerated
      *   flags, but in reality only a subset of them makes sense here. Specifying
      *   'preprocessing' flags is useful if the input scene does not conform to
      *   Assimp's default conventions as specified in the @link data Data Structures Page @endlink.
      *   In short, this means the geometry data should use a right-handed coordinate systems, face
      *   winding should be counter-clockwise and the UV coordinate origin is assumed to be in
      *   the upper left. The #aiProcess_MakeLeftHanded, #aiProcess_FlipUVs and
      *   #aiProcess_FlipWindingOrder flags are used in the import side to allow users
      *   to have those defaults automatically adapted to their conventions. Specifying those flags
      *   for exporting has the opposite effect, respectively. Some other of the
      *   #aiPostProcessSteps enumerated values may be useful as well, but you'll need
      *   to try out what their effect on the exported file is. Many formats impose
      *   their own restrictions on the structure of the geometry stored therein,
      *   so some preprocessing may have little or no effect at all, or may be
      *   redundant as exporters would apply them anyhow. A good example
      *   is triangulation - whilst you can enforce it by specifying
      *   the #aiProcess_Triangulate flag, most export formats support only
      *   triangulate data so they would run the step even if it wasn't requested.
      *
      *   If assimp detects that the input scene was directly taken from the importer side of
      *   the library (i.e. not copied using aiCopyScene and potentially modified afterwards),
      *   any post-processing steps already applied to the scene will not be applied again, unless
      *   they show non-idempotent behavior (#aiProcess_MakeLeftHanded, #aiProcess_FlipUVs and
      *   #aiProcess_FlipWindingOrder).
      * @return AI_SUCCESS if everything was fine.
      * @note Use aiCopyScene() to get a modifiable copy of a previously
      *   imported scene.*/
     aiReturn Export(const aiScene *pScene, const char *pFormatId, const char *pPath,
             unsigned int pPreprocessing = 0u, const ExportProperties *pProperties = nullptr);
     aiReturn Export(const aiScene *pScene, const std::string &pFormatId, const std::string &pPath,
             unsigned int pPreprocessing = 0u, const ExportProperties *pProperties = nullptr);
 
     // -------------------------------------------------------------------
     /** Returns an error description of an error that occurred in #Export
      *    or #ExportToBlob
      *
      * Returns an empty string if no error occurred.
      * @return A description of the last error, an empty string if no
      *   error occurred. The string is never nullptr.
      *
      * @note The returned function remains valid until one of the
      * following methods is called: #Export, #ExportToBlob, #FreeBlob */
     const char *GetErrorString() const;
 
     // -------------------------------------------------------------------
     /** Return the blob obtained from the last call to #ExportToBlob */
     const aiExportDataBlob *GetBlob() const;
 
     // -------------------------------------------------------------------
     /** Orphan the blob from the last call to #ExportToBlob. This means
      *  the caller takes ownership and is thus responsible for calling
      *  the C API function #aiReleaseExportBlob to release it. */
     const aiExportDataBlob *GetOrphanedBlob() const;
 
     // -------------------------------------------------------------------
     /** Frees the current blob.
      *
      *  The function does nothing if no blob has previously been
      *  previously produced via #ExportToBlob. #FreeBlob is called
      *  automatically by the destructor. The only reason to call
      *  it manually would be to reclaim as much storage as possible
      *  without giving up the #Exporter instance yet. */
     void FreeBlob();
 
     // -------------------------------------------------------------------
     /** Returns the number of export file formats available in the current
      *  Assimp build. Use #Exporter::GetExportFormatDescription to
      *  retrieve infos of a specific export format.
      *
      *  This includes built-in exporters as well as exporters registered
      *  using #RegisterExporter.
      **/
     size_t GetExportFormatCount() const;
 
     // -------------------------------------------------------------------
     /** Returns a description of the nth export file format. Use #
      *  #Exporter::GetExportFormatCount to learn how many export
      *  formats are supported.
      *
      * The returned pointer is of static storage duration if the
      * pIndex pertains to a built-in exporter (i.e. one not registered
      * via #RegistrerExporter). It is restricted to the life-time of the
      * #Exporter instance otherwise.
      *
      * @param pIndex Index of the export format to retrieve information
      *  for. Valid range is 0 to #Exporter::GetExportFormatCount
      * @return A description of that specific export format.
      *  NULL if pIndex is out of range. */
     const aiExportFormatDesc *GetExportFormatDescription(size_t pIndex) const;
 
     // -------------------------------------------------------------------
     /** Register a custom exporter. Custom export formats are limited to
      *    to the current #Exporter instance and do not affect the
      *    library globally. The indexes under which the format's
      *    export format description can be queried are assigned
      *    monotonously.
      *  @param desc Exporter description.
      *  @return aiReturn_SUCCESS if the export format was successfully
      *    registered. A common cause that would prevent an exporter
      *    from being registered is that its format id is already
      *    occupied by another format. */
     aiReturn RegisterExporter(const ExportFormatEntry &desc);
 
     // -------------------------------------------------------------------
     /** Remove an export format previously registered with #RegisterExporter
      *  from the #Exporter instance (this can also be used to drop
      *  built-in exporters because those are implicitly registered
      *  using #RegisterExporter).
      *  @param id Format id to be unregistered, this refers to the
      *    'id' field of #aiExportFormatDesc.
      *  @note Calling this method on a format description not yet registered
      *    has no effect.*/
     void UnregisterExporter(const char *id);
 
 protected:
     // Just because we don't want you to know how we're hacking around.
     ExporterPimpl *pimpl;
 };
 
 class ASSIMP_API ExportProperties {
 public:
     // Data type to store the key hash
     typedef unsigned int KeyType;
 
     // typedefs for our four configuration maps.
     // We don't need more, so there is no need for a generic solution
     typedef std::map<KeyType, int> IntPropertyMap;
     typedef std::map<KeyType, ai_real> FloatPropertyMap;
     typedef std::map<KeyType, std::string> StringPropertyMap;
     typedef std::map<KeyType, aiMatrix4x4> MatrixPropertyMap;
     typedef std::map<KeyType, std::function<void *(void *)>> CallbackPropertyMap;
 
 public:
     /** Standard constructor
     * @see ExportProperties()
     */
     ExportProperties();
 
     // -------------------------------------------------------------------
     /** Copy constructor.
      *
      * This copies the configuration properties of another ExportProperties.
      * @see ExportProperties(const ExportProperties& other)
      */
     ExportProperties(const ExportProperties &other);
 
     // -------------------------------------------------------------------
     /** Set an integer configuration property.
      * @param szName Name of the property. All supported properties
      *   are defined in the aiConfig.g header (all constants share the
      *   prefix AI_CONFIG_XXX and are simple strings).
      * @param iValue New value of the property
      * @return true if the property was set before. The new value replaces
      *   the previous value in this case.
      * @note Property of different types (float, int, string ..) are kept
      *   on different stacks, so calling SetPropertyInteger() for a
      *   floating-point property has no effect - the loader will call
      *   GetPropertyFloat() to read the property, but it won't be there.
      */
     bool SetPropertyInteger(const char *szName, int iValue);
 
     // -------------------------------------------------------------------
     /** Set a boolean configuration property. Boolean properties
      *  are stored on the integer stack internally so it's possible
      *  to set them via #SetPropertyBool and query them with
      *  #GetPropertyBool and vice versa.
      * @see SetPropertyInteger()
      */
     bool SetPropertyBool(const char *szName, bool value) {
         return SetPropertyInteger(szName, value);
     }
 
     // -------------------------------------------------------------------
     /** Set a floating-point configuration property.
      * @see SetPropertyInteger()
      */
     bool SetPropertyFloat(const char *szName, ai_real fValue);
 
     // -------------------------------------------------------------------
     /** Set a string configuration property.
      * @see SetPropertyInteger()
      */
     bool SetPropertyString(const char *szName, const std::string &sValue);
 
     // -------------------------------------------------------------------
     /** Set a matrix configuration property.
      * @see SetPropertyInteger()
      */
     bool SetPropertyMatrix(const char *szName, const aiMatrix4x4 &sValue);
 
     bool SetPropertyCallback(const char *szName, const std::function<void *(void *)> &f);
 
     // -------------------------------------------------------------------
     /** Get a configuration property.
      * @param szName Name of the property. All supported properties
      *   are defined in the aiConfig.g header (all constants share the
      *   prefix AI_CONFIG_XXX).
      * @param iErrorReturn Value that is returned if the property
      *   is not found.
      * @return Current value of the property
      * @note Property of different types (float, int, string ..) are kept
      *   on different lists, so calling SetPropertyInteger() for a
      *   floating-point property has no effect - the loader will call
      *   GetPropertyFloat() to read the property, but it won't be there.
      */
     int GetPropertyInteger(const char *szName,
             int iErrorReturn = 0xffffffff) const;
 
     // -------------------------------------------------------------------
     /** Get a boolean configuration property. Boolean properties
      *  are stored on the integer stack internally so it's possible
      *  to set them via #SetPropertyBool and query them with
      *  #GetPropertyBool and vice versa.
      * @see GetPropertyInteger()
      */
     bool GetPropertyBool(const char *szName, bool bErrorReturn = false) const {
         return GetPropertyInteger(szName, bErrorReturn) != 0;
     }
 
     // -------------------------------------------------------------------
     /** Get a floating-point configuration property
      * @see GetPropertyInteger()
      */
     ai_real GetPropertyFloat(const char *szName,
             ai_real fErrorReturn = 10e10f) const;
 
     // -------------------------------------------------------------------
     /** Get a string configuration property
      *
      *  The return value remains valid until the property is modified.
      * @see GetPropertyInteger()
      */
     const std::string GetPropertyString(const char *szName,
             const std::string &sErrorReturn = "") const;
 
     // -------------------------------------------------------------------
     /** Get a matrix configuration property
      *
      *  The return value remains valid until the property is modified.
      * @see GetPropertyInteger()
      */
     const aiMatrix4x4 GetPropertyMatrix(const char *szName,
             const aiMatrix4x4 &sErrorReturn = aiMatrix4x4()) const;
 
     std::function<void *(void *)> GetPropertyCallback(const char* szName) const;
 
     // -------------------------------------------------------------------
     /** Determine a integer configuration property has been set.
     * @see HasPropertyInteger()
      */
     bool HasPropertyInteger(const char *szName) const;
 
     /** Determine a boolean configuration property has been set.
     * @see HasPropertyBool()
      */
     bool HasPropertyBool(const char *szName) const;
 
     /** Determine a boolean configuration property has been set.
     * @see HasPropertyFloat()
      */
     bool HasPropertyFloat(const char *szName) const;
 
     /** Determine a String configuration property has been set.
     * @see HasPropertyString()
      */
     bool HasPropertyString(const char *szName) const;
 
     /** Determine a Matrix configuration property has been set.
     * @see HasPropertyMatrix()
      */
     bool HasPropertyMatrix(const char *szName) const;
 
     bool HasPropertyCallback(const char *szName) const;
 
     /** List of integer properties */
     IntPropertyMap mIntProperties;
 
     /** List of floating-point properties */
     FloatPropertyMap mFloatProperties;
 
     /** List of string properties */
     StringPropertyMap mStringProperties;
 
     /** List of Matrix properties */
     MatrixPropertyMap mMatrixProperties;
 
     CallbackPropertyMap mCallbackProperties;
 };
 
 // ----------------------------------------------------------------------------------
 inline const aiExportDataBlob *Exporter::ExportToBlob(const aiScene *pScene, const std::string &pFormatId,
         unsigned int pPreprocessing, const ExportProperties *pProperties) {
     return ExportToBlob(pScene, pFormatId.c_str(), pPreprocessing, pProperties);
 }
 
 // ----------------------------------------------------------------------------------
 inline aiReturn Exporter ::Export(const aiScene *pScene, const std::string &pFormatId,
         const std::string &pPath, unsigned int pPreprocessing,
         const ExportProperties *pProperties) {
     return Export(pScene, pFormatId.c_str(), pPath.c_str(), pPreprocessing, pProperties);
 }
 
 } // namespace Assimp
 
 #endif // ASSIMP_BUILD_NO_EXPORT
 #endif // AI_EXPORT_HPP_INC

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