196 lines
6.5 KiB
C
196 lines
6.5 KiB
C
/*
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Simple DiretMedia Layer
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_properties.h
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*
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* Header file for SDL properties.
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*/
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#ifndef SDL_properties_h_
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#define SDL_properties_h_
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#include <SDL3/SDL_begin_code.h>
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* SDL properties ID
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*/
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typedef Uint32 SDL_PropertiesID;
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/**
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* Create a set of properties
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*
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* All properties are automatically destroyed when SDL_Quit() is called.
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*
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* \returns an ID for a new set of properties, or 0 on failure; call
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* SDL_GetError() for more information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_DestroyProperties
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*/
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extern DECLSPEC SDL_PropertiesID SDLCALL SDL_CreateProperties(void);
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/**
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* Lock a set of properties
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*
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* Obtain a multi-threaded lock for these properties. Other threads will wait
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* while trying to lock these properties until they are unlocked. Properties
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* must be unlocked before they are destroyed.
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*
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* The lock is automatically taken when setting individual properties, this
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* function is only needed when you want to set several properties atomically
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* or want to guarantee that properties being queried aren't freed in another
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* thread.
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*
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* \param props the properties to lock
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* \returns 0 on success or a negative error code on failure; call
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* SDL_GetError() for more information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_UnlockProperties
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*/
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extern DECLSPEC int SDLCALL SDL_LockProperties(SDL_PropertiesID props);
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/**
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* Unlock a set of properties
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*
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* \param props the properties to unlock
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_LockProperties
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*/
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extern DECLSPEC void SDLCALL SDL_UnlockProperties(SDL_PropertiesID props);
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/**
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* Set a property on a set of properties
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*
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* \param props the properties to modify
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* \param name the name of the property to modify
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* \param value the new value of the property, or NULL to delete the property
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* \returns 0 on success or a negative error code on failure; call
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* SDL_GetError() for more information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_GetProperty
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* \sa SDL_SetPropertyWithCleanup
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*/
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extern DECLSPEC int SDLCALL SDL_SetProperty(SDL_PropertiesID props, const char *name, void *value);
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/**
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* Set a property on a set of properties with a cleanup function that is called when the property is deleted
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*
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* \param props the properties to modify
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* \param name the name of the property to modify
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* \param value the new value of the property, or NULL to delete the property
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* \param cleanup the function to call when this property is deleted, or NULL
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* if no cleanup is necessary
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* \param userdata a pointer that is passed to the cleanup function
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* \returns 0 on success or a negative error code on failure; call
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* SDL_GetError() for more information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_GetProperty
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* \sa SDL_SetProperty
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*/
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extern DECLSPEC int SDLCALL SDL_SetPropertyWithCleanup(SDL_PropertiesID props, const char *name, void *value, void (SDLCALL *cleanup)(void *userdata, void *value), void *userdata);
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/**
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* Get a property on a set of properties
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*
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* By convention, the names of properties that SDL exposes on objects will start with "SDL.", and properties that SDL uses internally will start with "SDL.internal.". These should be considered read-only and should not be modified by applications.
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*
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* \param props the properties to query
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* \param name the name of the property to query
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* \returns the value of the property, or NULL if it is not set.
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*
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* \threadsafety It is safe to call this function from any thread, although
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* the data returned is not protected and could potentially be
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* freed if you call SDL_SetProperty() or SDL_ClearProperty() on
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* these properties from another thread. If you need to avoid
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* this, use SDL_LockProperties() and SDL_UnlockProperties().
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_SetProperty
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*/
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extern DECLSPEC void *SDLCALL SDL_GetProperty(SDL_PropertiesID props, const char *name);
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/**
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* Clear a property on a set of properties
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*
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* \param props the properties to modify
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* \param name the name of the property to clear
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* \returns 0 on success or a negative error code on failure; call
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* SDL_GetError() for more information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_GetProperty
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*/
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extern DECLSPEC int SDLCALL SDL_ClearProperty(SDL_PropertiesID props, const char *name);
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/**
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* Destroy a set of properties
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*
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* All properties are deleted and their cleanup functions will be called, if
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* any.
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*
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* \param props the properties to destroy
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*
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* \threadsafety This function should not be called while these properties are
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* locked or other threads might be setting or getting values
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* from these properties.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_CreateProperties
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*/
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extern DECLSPEC void SDLCALL SDL_DestroyProperties(SDL_PropertiesID props);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include <SDL3/SDL_close_code.h>
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#endif /* SDL_properties_h_ */
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