xserver-xorg-dev-lts-utopic 2:1.16.0-1ubuntu1.2~trusty2 / usr / include / xorg / privates.h

/***********************************************************

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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******************************************************************/

#ifndef PRIVATES_H
#define PRIVATES_H 1

#include <X11/Xdefs.h>
#include <X11/Xosdefs.h>
#include <X11/Xfuncproto.h>
#include "misc.h"

/*****************************************************************
 * STUFF FOR PRIVATES
 *****************************************************************/

typedef struct _Private PrivateRec, *PrivatePtr;

typedef enum {
    /* XSELinux uses the same private keys for numerous objects */
    PRIVATE_XSELINUX,

    /* Otherwise, you get a private in just the requested structure
     */
    /* These can have objects created before all of the keys are registered */
    PRIVATE_SCREEN,
    PRIVATE_EXTENSION,
    PRIVATE_COLORMAP,
    PRIVATE_DEVICE,

    /* These cannot have any objects before all relevant keys are registered */
    PRIVATE_CLIENT,
    PRIVATE_PROPERTY,
    PRIVATE_SELECTION,
    PRIVATE_WINDOW,
    PRIVATE_PIXMAP,
    PRIVATE_GC,
    PRIVATE_CURSOR,
    PRIVATE_CURSOR_BITS,

    /* extension privates */
    PRIVATE_DAMAGE,
    PRIVATE_GLYPH,
    PRIVATE_GLYPHSET,
    PRIVATE_PICTURE,
    PRIVATE_SYNC_FENCE,

    /* last private type */
    PRIVATE_LAST,
} DevPrivateType;

typedef struct _DevPrivateKeyRec {
    int offset;
    int size;
    Bool initialized;
    Bool allocated;
    DevPrivateType type;
    struct _DevPrivateKeyRec *next;
} DevPrivateKeyRec, *DevPrivateKey;

typedef struct _DevPrivateSetRec {
    DevPrivateKey key;
    unsigned offset;
    int created;
    int allocated;
} DevPrivateSetRec, *DevPrivateSetPtr;

typedef struct _DevScreenPrivateKeyRec {
    DevPrivateKeyRec screenKey;
} DevScreenPrivateKeyRec, *DevScreenPrivateKey;

/*
 * Let drivers know how to initialize private keys
 */

#define HAS_DEVPRIVATEKEYREC		1
#define HAS_DIXREGISTERPRIVATEKEY	1

/*
 * Register a new private index for the private type.
 *
 * This initializes the specified key and optionally requests pre-allocated
 * private space for your driver/module. If you request no extra space, you
 * may set and get a single pointer value using this private key. Otherwise,
 * you can get the address of the extra space and store whatever data you like
 * there.
 *
 * You may call dixRegisterPrivateKey more than once on the same key, but the
 * size and type must match or the server will abort.
 *
 * dixRegisterPrivateKey returns FALSE if it fails to allocate memory
 * during its operation.
 */
extern _X_EXPORT Bool
 dixRegisterPrivateKey(DevPrivateKey key, DevPrivateType type, unsigned size);

/*
 * Check whether a private key has been registered
 */
static inline Bool
dixPrivateKeyRegistered(DevPrivateKey key)
{
    return key->initialized;
}

/*
 * Get the address of the private storage.
 *
 * For keys with pre-defined storage, this gets the base of that storage
 * Otherwise, it returns the place where the private pointer is stored.
 */
static inline void *
dixGetPrivateAddr(PrivatePtr *privates, const DevPrivateKey key)
{
    assert(key->initialized);
    return (char *) (*privates) + key->offset;
}

/*
 * Fetch a private pointer stored in the object
 *
 * Returns the pointer stored with dixSetPrivate.
 * This must only be used with keys that have
 * no pre-defined storage
 */
static inline void *
dixGetPrivate(PrivatePtr *privates, const DevPrivateKey key)
{
    assert(key->size == 0);
    return *(void **) dixGetPrivateAddr(privates, key);
}

/*
 * Associate 'val' with 'key' in 'privates' so that later calls to
 * dixLookupPrivate(privates, key) will return 'val'.
 */
static inline void
dixSetPrivate(PrivatePtr *privates, const DevPrivateKey key, void *val)
{
    assert(key->size == 0);
    *(void **) dixGetPrivateAddr(privates, key) = val;
}

#include "dix.h"
#include "resource.h"

/*
 * Lookup a pointer to the private record.
 *
 * For privates with defined storage, return the address of the
 * storage. For privates without defined storage, return the pointer
 * contents
 */
static inline void *
dixLookupPrivate(PrivatePtr *privates, const DevPrivateKey key)
{
    if (key->size)
        return dixGetPrivateAddr(privates, key);
    else
        return dixGetPrivate(privates, key);
}

/*
 * Look up the address of the pointer to the storage
 *
 * This returns the place where the private pointer is stored,
 * which is only valid for privates without predefined storage.
 */
static inline void **
dixLookupPrivateAddr(PrivatePtr *privates, const DevPrivateKey key)
{
    assert(key->size == 0);
    return (void **) dixGetPrivateAddr(privates, key);
}

extern _X_EXPORT Bool

dixRegisterScreenPrivateKey(DevScreenPrivateKey key, ScreenPtr pScreen,
                            DevPrivateType type, unsigned size);

extern _X_EXPORT DevPrivateKey
 _dixGetScreenPrivateKey(const DevScreenPrivateKey key, ScreenPtr pScreen);

static inline void *
dixGetScreenPrivateAddr(PrivatePtr *privates, const DevScreenPrivateKey key,
                        ScreenPtr pScreen)
{
    return dixGetPrivateAddr(privates, _dixGetScreenPrivateKey(key, pScreen));
}

static inline void *
dixGetScreenPrivate(PrivatePtr *privates, const DevScreenPrivateKey key,
                    ScreenPtr pScreen)
{
    return dixGetPrivate(privates, _dixGetScreenPrivateKey(key, pScreen));
}

static inline void
dixSetScreenPrivate(PrivatePtr *privates, const DevScreenPrivateKey key,
                    ScreenPtr pScreen, void *val)
{
    dixSetPrivate(privates, _dixGetScreenPrivateKey(key, pScreen), val);
}

static inline void *
dixLookupScreenPrivate(PrivatePtr *privates, const DevScreenPrivateKey key,
                       ScreenPtr pScreen)
{
    return dixLookupPrivate(privates, _dixGetScreenPrivateKey(key, pScreen));
}

static inline void **
dixLookupScreenPrivateAddr(PrivatePtr *privates, const DevScreenPrivateKey key,
                           ScreenPtr pScreen)
{
    return dixLookupPrivateAddr(privates,
                                _dixGetScreenPrivateKey(key, pScreen));
}

/*
 * These functions relate to allocations related to a specific screen;
 * space will only be available for objects allocated for use on that
 * screen. As such, only objects which are related directly to a specific
 * screen are candidates for allocation this way, this includes
 * windows, pixmaps, gcs, pictures and colormaps. This key is
 * used just like any other key using dixGetPrivate and friends.
 *
 * This is distinctly different from the ScreenPrivateKeys above which
 * allocate space in global objects like cursor bits for a specific
 * screen, allowing multiple screen-related chunks of storage in a
 * single global object.
 */

#define HAVE_SCREEN_SPECIFIC_PRIVATE_KEYS       1

extern _X_EXPORT Bool
dixRegisterScreenSpecificPrivateKey(ScreenPtr pScreen, DevPrivateKey key,
                                    DevPrivateType type, unsigned size);

/* Clean up screen-specific privates before CloseScreen */
extern void
dixFreeScreenSpecificPrivates(ScreenPtr pScreen);

/* Initialize screen-specific privates in AddScreen */
extern void
dixInitScreenSpecificPrivates(ScreenPtr pScreen);

extern _X_EXPORT void *
_dixAllocateScreenObjectWithPrivates(ScreenPtr pScreen,
                                     unsigned size,
                                     unsigned clear,
                                     unsigned offset,
                                     DevPrivateType type);

#define dixAllocateScreenObjectWithPrivates(s, t, type) _dixAllocateScreenObjectWithPrivates(s, sizeof(t), sizeof(t), offsetof(t, devPrivates), type)

extern _X_EXPORT int
dixScreenSpecificPrivatesSize(ScreenPtr pScreen, DevPrivateType type);

extern _X_EXPORT void
_dixInitScreenPrivates(ScreenPtr pScreen, PrivatePtr *privates, void *addr, DevPrivateType type);

#define dixInitScreenPrivates(s, o, v, type) _dixInitScreenPrivates(s, &(o)->devPrivates, (v), type);

/*
 * Allocates private data separately from main object.
 *
 * For objects created during server initialization, this allows those
 * privates to be re-allocated as new private keys are registered.
 *
 * This includes screens, the serverClient, default colormaps and
 * extensions entries.
 */
extern _X_EXPORT Bool
 dixAllocatePrivates(PrivatePtr *privates, DevPrivateType type);

/*
 * Frees separately allocated private data
 */
extern _X_EXPORT void
 dixFreePrivates(PrivatePtr privates, DevPrivateType type);

/*
 * Initialize privates by zeroing them
 */
extern _X_EXPORT void
_dixInitPrivates(PrivatePtr *privates, void *addr, DevPrivateType type);

#define dixInitPrivates(o, v, type) _dixInitPrivates(&(o)->devPrivates, (v), type);

/*
 * Clean up privates
 */
extern _X_EXPORT void
 _dixFiniPrivates(PrivatePtr privates, DevPrivateType type);

#define dixFiniPrivates(o,t)	_dixFiniPrivates((o)->devPrivates,t)

/*
 * Allocates private data at object creation time. Required
 * for almost all objects, except for the list described
 * above for dixAllocatePrivates.
 */
extern _X_EXPORT void *_dixAllocateObjectWithPrivates(unsigned size,
                                                      unsigned clear,
                                                      unsigned offset,
                                                      DevPrivateType type);

#define dixAllocateObjectWithPrivates(t, type) (t *) _dixAllocateObjectWithPrivates(sizeof(t), sizeof(t), offsetof(t, devPrivates), type)

extern _X_EXPORT void

_dixFreeObjectWithPrivates(void *object, PrivatePtr privates,
                           DevPrivateType type);

#define dixFreeObjectWithPrivates(o,t) _dixFreeObjectWithPrivates(o, (o)->devPrivates, t)

/*
 * Return size of privates for the specified type
 */
extern _X_EXPORT int
 dixPrivatesSize(DevPrivateType type);

/*
 * Dump out private stats to ErrorF
 */
extern void
 dixPrivateUsage(void);

/*
 * Resets the privates subsystem.  dixResetPrivates is called from the main loop
 * before each server generation.  This function must only be called by main().
 */
extern _X_EXPORT void
 dixResetPrivates(void);

/*
 * Looks up the offset where the devPrivates field is located.
 *
 * Returns -1 if the specified resource has no dev privates.
 * The position of the devPrivates field varies by structure
 * and calling code might only know the resource type, not the
 * structure definition.
 */
extern _X_EXPORT int
 dixLookupPrivateOffset(RESTYPE type);

/*
 * Convenience macro for adding an offset to an object pointer
 * when making a call to one of the devPrivates functions
 */
#define DEVPRIV_AT(ptr, offset) ((PrivatePtr *)((char *)(ptr) + offset))

#endif                          /* PRIVATES_H */