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/usr/include/xorg/damage.h is in xserver-xorg-dev 2:1.15.1-0ubuntu2.11.

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/*
 * Copyright © 2003 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#ifndef _DAMAGE_H_
#define _DAMAGE_H_

typedef struct _damage *DamagePtr;

typedef enum _damageReportLevel {
    DamageReportRawRegion,
    DamageReportDeltaRegion,
    DamageReportBoundingBox,
    DamageReportNonEmpty,
    DamageReportNone
} DamageReportLevel;

typedef void (*DamageReportFunc) (DamagePtr pDamage, RegionPtr pRegion,
                                  void *closure);
typedef void (*DamageDestroyFunc) (DamagePtr pDamage, void *closure);

typedef void (*DamageScreenCreateFunc) (DamagePtr);
typedef void (*DamageScreenRegisterFunc) (DrawablePtr, DamagePtr);
typedef void (*DamageScreenUnregisterFunc) (DrawablePtr, DamagePtr);
typedef void (*DamageScreenDestroyFunc) (DamagePtr);

typedef struct _damageScreenFuncs {
    DamageScreenCreateFunc Create;
    DamageScreenRegisterFunc Register;
    DamageScreenUnregisterFunc Unregister;
    DamageScreenDestroyFunc Destroy;
} DamageScreenFuncsRec, *DamageScreenFuncsPtr;

extern _X_EXPORT void miDamageCreate(DamagePtr);
extern _X_EXPORT void miDamageRegister(DrawablePtr, DamagePtr);
extern _X_EXPORT void miDamageUnregister(DrawablePtr, DamagePtr);
extern _X_EXPORT void miDamageDestroy(DamagePtr);

extern _X_EXPORT Bool
 DamageSetup(ScreenPtr pScreen);

extern _X_EXPORT DamagePtr
DamageCreate(DamageReportFunc damageReport,
             DamageDestroyFunc damageDestroy,
             DamageReportLevel damageLevel,
             Bool isInternal, ScreenPtr pScreen, void *closure);

extern _X_EXPORT void
 DamageDrawInternal(ScreenPtr pScreen, Bool enable);

extern _X_EXPORT void
 DamageRegister(DrawablePtr pDrawable, DamagePtr pDamage);

extern _X_EXPORT void
 DamageUnregister(DamagePtr pDamage);

extern _X_EXPORT void
 DamageDestroy(DamagePtr pDamage);

extern _X_EXPORT Bool
 DamageSubtract(DamagePtr pDamage, const RegionPtr pRegion);

extern _X_EXPORT void
 DamageEmpty(DamagePtr pDamage);

extern _X_EXPORT RegionPtr
 DamageRegion(DamagePtr pDamage);

extern _X_EXPORT RegionPtr
 DamagePendingRegion(DamagePtr pDamage);

/* In case of rendering, call this before the submitting the commands. */
extern _X_EXPORT void
 DamageRegionAppend(DrawablePtr pDrawable, RegionPtr pRegion);

/* Call this directly after the rendering operation has been submitted. */
extern _X_EXPORT void
 DamageRegionProcessPending(DrawablePtr pDrawable);

/* Call this when you create a new Damage and you wish to send an initial damage message (to it). */
extern _X_EXPORT void
 DamageReportDamage(DamagePtr pDamage, RegionPtr pDamageRegion);

/* Avoid using this call, it only exists for API compatibility. */
extern _X_EXPORT void
 DamageDamageRegion(DrawablePtr pDrawable, const RegionPtr pRegion);

extern _X_EXPORT void
 DamageSetReportAfterOp(DamagePtr pDamage, Bool reportAfter);

extern _X_EXPORT DamageScreenFuncsPtr DamageGetScreenFuncs(ScreenPtr);

#endif                          /* _DAMAGE_H_ */