/* Copyright (c) 2009 The Khronos Group Inc.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and/or associated documentation files (the

 * "Materials"), to deal in the Materials without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Materials, and to

 * permit persons to whom the Materials are furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Materials.

 *

 * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

 */

#ifndef OWFATTRIBUTES_H_

#define OWFATTRIBUTES_H_

#include "owftypes.h"

#include "owfutils.h"

#ifdef __cplusplus

extern "C"

{

#endif

/*!

 *  \file Attribute interface

 *

 *  Attribute interface provides mechanism for controlled reading/writing

 *  access of different object properties in WFC and WFD APIs by proxying

 *  object instances' properties.

 *

 */

#define RANGE_UNDEFINED     0xFFFFFFFF

#define ATTR_LENGTH_BITS    20

#define MAX_ATTR_LENGTH     (1 << ATTR_LENGTH_BITS)-1

#define NUM_ATTR_VALUE_COPIES 3

#define COMMITTED_ATTR_VALUE_INDEX 0

#define WORKING_ATTR_VALUE_INDEX 1

#define SNAPSHOT_ATTR_VALUE_INDEX 2

typedef enum {

    ATTR_ERROR_NONE             = 0,

    ATTR_ERROR_NOT_FOUND        = -1,

    ATTR_ERROR_ALREADY_IN_USE   = -2,

    ATTR_ERROR_INVALID_ATTRIBUTE= -3,

    ATTR_ERROR_INVALID_VALUE    = -4,

    ATTR_ERROR_INVALID_ARGUMENT = -5,

    ATTR_ERROR_INVALID_CONTEXT  = -6,

    ATTR_ERROR_NO_MEMORY        = -7,

    ATTR_ERROR_INSANE           = -8,

    ATTR_ERROR_ACCESS_DENIED    = -9,

    ATTR_ERROR_INVALID_TYPE     = -10,

    ATTR_ERROR_CANT_HANDLE      = -11

} OWF_ATTRIBUTE_LIST_STATUS;

/* Attribute value element types */

typedef enum {

    AT_UNDEFINED = 0,

    AT_INTEGER = 1,

    AT_FLOAT = 2,

    AT_BOOLEAN = 3

} OWF_ATTRIBUTE_TYPE;

/*

 * Attribute information (header)

 *

 * Dirty field is internal. Do not fiddle with it.

 * 

 * Comment on use of bitfields: 

 * 1: It stops generic use of split dirty flag

 * 2: Some compilers will not reorder members to merge length into earier fields.

 */

typedef struct {

    OWFuint                 type: 2;

    OWFuint                 dirty: 1;

    OWFuint                 dirtysnapshot: 1;

    OWFuint                 readonly: 1;

} OWF_ATTRIBUTE_INFO;

/*

 * Attribute may be a scalar (1-element) or vector (n-element),

 * containing a reference to either integer, boolean or float value(s).

 * Attribute type cannot be changed after it has been initialized.

 *

 * Attributes don't own the data they refer to; attributes only

 * control the reading and writing of the data they refer to.

 */

typedef OWFfloat*           OWF_FLOAT_REF;

typedef OWFint*             OWF_INT_REF;

typedef OWFboolean*         OWF_BOOL_REF;

typedef OWFfloat*           OWF_FLOAT_VECTOR_REF;

typedef OWFint*             OWF_INT_VECTOR_REF;

typedef struct {

    OWF_ATTRIBUTE_INFO      attr_info;

    union {

        OWF_INT_REF             int_value;

        OWF_FLOAT_REF           float_value;

        void*                   gen_ptr;

        /*

        OWF_INT_VECTOR_REF      int_vector_value;

        OWF_FLOAT_VECTOR_REF    float_vector_value;

        */

    } attr_value[NUM_ATTR_VALUE_COPIES];

} OWF_ATTRIBUTE;

/*

 * Attribute list/context. Container for attributes.

 *

 * One list/context can contain constant number of

 * attributes (amount of which is defined at construction

 * time)

 */

typedef struct {

    OWFint                  range_start;

    OWFint                  range_end;

    OWF_ATTRIBUTE*          attributes;

    OWF_ATTRIBUTE_LIST_STATUS  last_error;

} OWF_ATTRIBUTE_LIST;

/*

 * \brief Initializes attribute context

 *

 * \param aContext Attribute context to initialize

 * \param aStart Attribute range start

 * \param aEnd Attribute range end. Must be greater than range start.

 *

 * \return ERR_INVALID_ARGUMENT

 * ERR_NO_MEMORY

 */

OWF_API_CALL void

OWF_AttributeList_Create(OWF_ATTRIBUTE_LIST* aContext,

                         OWFint aStart,

                         OWFint aEnd);

/*

 * \brief Destroy attribute context and free any resources (memory

 * blocks) allocated to it. All attributes are destroyed.

 *

 * \param aContext Attribute context to destroy

 *

 * \return ERR_INVALID_ARGUMENT

 * ERR_INVALID_CONTEXT

 */

OWF_API_CALL void

OWF_AttributeList_Destroy(OWF_ATTRIBUTE_LIST* aContext);

/*

 * \brief Gets the last error from the attribute.

 * Resets the error state.

 *

 * \return	Error code.

 *

 */

OWF_API_CALL OWF_ATTRIBUTE_LIST_STATUS

OWF_AttributeList_GetError(OWF_ATTRIBUTE_LIST* aContext);

/*

 * \brief Intialize integer attribute

 *

 * \param aContext Attibute context

 * \param aName Attribute name

 * \param aValue Attribute initial value

 * \param aRdOnly Read-only flag

 *

 * \return ERR_INVALID_ARGUMENT

 * ERR_INVALID_ATTRIBUTE

 * ERR_INVALID_CONTEXT

 */

OWF_API_CALL void

OWF_Attribute_Initi(OWF_ATTRIBUTE_LIST* aContext,

                    OWFint aName,

                    OWF_INT_REF aValue,

                    OWFboolean aRdOnly);

/*

 * \brief Initialize float attribute

 *

 * \param aContext Attribute context

 * \param aName Attribute name

 * \param aValue Initial value for attribute

 * \param aRdOnly Read-only flag

 *

 * \return ERR_INVALID_ARGUMENT

 * ERR_INVALID_ATTRIBUTE

 * ERR_INVALID_CONTEXT

 */

OWF_API_CALL void

OWF_Attribute_Initf(OWF_ATTRIBUTE_LIST* aContext,

                    OWFint aName,

                    OWF_FLOAT_REF aValue,

                    OWFboolean aRdOnly);

/*

 * \brief Initialize boolean attribute

 *

 * \param aContext Attribute context

 * \param aName Attribute name

 * \param aValue Initial value for attribute

 * \param aRdOnly Read-only flag

 *

 * \return ERR_INVALID_ARGUMENT

 * ERR_INVALID_ATTRIBUTE

 * ERR_INVALID_CONTEXT

 */

OWF_API_CALL void

OWF_Attribute_Initb(OWF_ATTRIBUTE_LIST* aContext,

                    OWFint aName,

                    OWF_BOOL_REF aValue,

                    OWFboolean aRdOnly);

/*

 * \brief Initialize vector attribute

 *

 * \param aContext Attribute context

 * \param aName Attribute name

 * \param aLength Attribute (vector) length

 * \param aValues Initial value(s) for attribute

 * \param aRdOnly Read-only flag

 *

 * \return ERR_INVALID_ARGUMENT

 * ERR_INVALID_ATTRIBUTE

 * ERR_INVALID_CONTEXT

 * ERR_CANT_HANDLE

 */

OWF_API_CALL void

OWF_Attribute_Initiv(OWF_ATTRIBUTE_LIST* aContext,

                     OWFint aName,

                     OWFint aLength,

                     OWF_INT_VECTOR_REF aValues,

                     OWFboolean aRdOnly);

/*

 * \brief Initialize vector attribute

 *

 * \param aContext Attribute context

 * \param aName Attribute name

 * \param aLength Attribute (vector) length

 * \param aValues Initial value(s) for attributes

 * \param aRdOnly Read-only flag

 *

 * \return

 */

OWF_API_CALL void

OWF_Attribute_Initfv(OWF_ATTRIBUTE_LIST* aContext,

                     OWFint aName,

                     OWFint aLength,

                     OWF_FLOAT_VECTOR_REF aValues,

                     OWFboolean aRdOnly);

/*

 * \brief Get attribute integer value.

 *

 * \param aContext Attribute context

 * \param aName Attribute name

 *

 * \return Attribute integer value (floats are floor()ed). For vector

 * attributes the return value will be error ERR_INVALID_TYPE.

 * ERR_INVALID_ATTRIBUTE

 * ERR_INVALID_CONTEXT

 */

OWF_API_CALL OWFint

OWF_Attribute_GetValuei(OWF_ATTRIBUTE_LIST* aContext,

                        OWFint aName);

/*

 * \brief Return boolean attribute value

 *

 * \param aContext Attribute context

 * \param aName Attribute name

 *

 * \return Attribute value

 * ERR_INVALID_ATTRIBUTE

 * ERR_INVALID_TYPE

 */

OWF_API_CALL OWFboolean

OWF_Attribute_GetValueb(OWF_ATTRIBUTE_LIST* aContext,

                        OWFint aName);

/*

 * \brief Get attribute float value

 *

 * \param aContext

 * \param aName

 * \param aValue

 *

 * \return Attribute

 */

OWF_API_CALL OWFfloat

OWF_Attribute_GetValuef(OWF_ATTRIBUTE_LIST* aContext,

                        OWFint aName);

/*

 * \brief

 *

 * \param aContext

 * \param aName

 * \param aSize

 * \param aValue

 *

 * \return

 */

OWF_API_CALL OWFint

OWF_Attribute_GetValueiv(OWF_ATTRIBUTE_LIST* aContext,

                         OWFint aName,

                         OWFint aLength,

                         OWFint* aValue);

/*

 * \brief

 *

 * \param aContext

 * \param aName

 * \param aSize

 * \param aValue

 *

 * \return

 */

OWF_API_CALL OWFint

OWF_Attribute_GetValuefv(OWF_ATTRIBUTE_LIST* aContext,

                         OWFint aName,

                         OWFint aLength,

                         OWFfloat* aValue);

/*

 * \brief

 *

 * \param aContext

 * \param aName

 * \param aValue

 *

 * \return

 */

OWF_API_CALL void

OWF_Attribute_SetValuei(OWF_ATTRIBUTE_LIST* aContext,

                        OWFint aName,

                        OWFint aValue);

/*

 * \brief

 *

 * \param aContext

 * \param aName

 * \param aValue

 *

 * \return

 */

OWF_API_CALL void

OWF_Attribute_SetValuef(OWF_ATTRIBUTE_LIST* aContext,

                        OWFint aName,

                        OWFfloat aValue);

/*

 * \brief

 *

 * \param

 * \param

 * \param

 *

 * \return

 */

OWF_API_CALL void

OWF_Attribute_SetValueb(OWF_ATTRIBUTE_LIST* aContext,

                        OWFint aName,

                        OWFboolean aValue);

/*

 * \brief

 *

 * \param

 * \param

 * \param

 *

 * \return

 */

OWF_API_CALL void

OWF_Attribute_SetValueiv(OWF_ATTRIBUTE_LIST* aContext,

                         OWFint aName,

                         OWFint aLength,

                         const OWFint* aValue);

/*

 * \brief

 *

 * \param

 * \param

 * \param

 *

 * \return

 */

OWF_API_CALL void

OWF_Attribute_SetValuefv(OWF_ATTRIBUTE_LIST* aContext,

                         OWFint aName,

                         OWFint aLength,

                         const OWFfloat* aValue);

OWF_API_CALL void

OWF_AttributeList_Commit(OWF_ATTRIBUTE_LIST* aContext, OWFint aStart, OWFint aEnd, OWFint aCopyTo );

#ifdef __cplusplus

}

#endif

#endif /* ATTRIBUTES_H_ */