/*
 * Copyright © 2002 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

#include "damageextint.h"
#include "extinit.h"

unsigned char DamageReqCode;

int DamageEventBase;

int DamageErrorBase;

int DamageClientPrivateIndex;

RESTYPE DamageExtType;

RESTYPE DamageExtWinType;

/* Version of the damage extension supported by the server, as opposed to the
 * DAMAGE_* defines from damageproto for what version the proto header
 * supports.
 */
#define SERVER_DAMAGE_MAJOR	1
#define SERVER_DAMAGE_MINOR	1

#define prScreen	screenInfo.screens[0]

static void
DamageExtNotify(DamageExtPtr pDamageExt, BoxPtr pBoxes, int nBoxes)
{
    ClientPtr pClient = pDamageExt->pClient;
    DamageClientPtr pDamageClient = GetDamageClient(pClient);
    DrawablePtr pDrawable = pDamageExt->pDrawable;
    xDamageNotifyEvent ev;
    int i;

    UpdateCurrentTimeIf();
    ev = (xDamageNotifyEvent) {
        .type = DamageEventBase + XDamageNotify,
        .level = pDamageExt->level,
        .drawable = pDamageExt->drawable,
        .damage = pDamageExt->id,
        .timestamp = currentTime.milliseconds,
        .geometry.x = pDrawable->x,
        .geometry.y = pDrawable->y,
        .geometry.width = pDrawable->width,
        .geometry.height = pDrawable->height
    };
    if (pBoxes) {
        for (i = 0; i < nBoxes; i++) {
            ev.level = pDamageExt->level;
            if (i < nBoxes - 1)
                ev.level |= DamageNotifyMore;
            ev.area.x = pBoxes[i].x1;
            ev.area.y = pBoxes[i].y1;
            ev.area.width = pBoxes[i].x2 - pBoxes[i].x1;
            ev.area.height = pBoxes[i].y2 - pBoxes[i].y1;
            WriteEventsToClient(pClient, 1, (xEvent *) &ev);
        }
    }
    else {
        ev.area.x = 0;
        ev.area.y = 0;
        ev.area.width = pDrawable->width;
        ev.area.height = pDrawable->height;
        WriteEventsToClient(pClient, 1, (xEvent *) &ev);
    }
    /* Composite extension marks clients with manual Subwindows as critical */
    if (pDamageClient->critical > 0) {
        SetCriticalOutputPending();
        pClient->smart_priority = SMART_MAX_PRIORITY;
    }
}

static void
DamageExtReport(DamagePtr pDamage, RegionPtr pRegion, void *closure)
{
    DamageExtPtr pDamageExt = closure;

    switch (pDamageExt->level) {
    case DamageReportRawRegion:
    case DamageReportDeltaRegion:
        DamageExtNotify(pDamageExt, REGION_RECTS(pRegion),
                        REGION_NUM_RECTS(pRegion));
        break;
    case DamageReportBoundingBox:
        DamageExtNotify(pDamageExt, REGION_EXTENTS(pRegion), 1);
        break;
    case DamageReportNonEmpty:
        DamageExtNotify(pDamageExt, NullBox, 0);
        break;
    case DamageReportNone:
        break;
    }
}

static void
DamageExtDestroy(DamagePtr pDamage, void *closure)
{
    DamageExtPtr pDamageExt = closure;

    pDamageExt->pDamage = 0;
    if (pDamageExt->id)
        FreeResource(pDamageExt->id, RT_NONE);
}

void
DamageExtSetCritical(ClientPtr pClient, Bool critical)
{
    DamageClientPtr pDamageClient = GetDamageClient(pClient);

    if (pDamageClient)
        pDamageClient->critical += critical ? 1 : -1;
}

static int
ProcDamageQueryVersion(ClientPtr client)
{
    DamageClientPtr pDamageClient = GetDamageClient(client);

    xDamageQueryVersionReply rep;


    REQUEST(xDamageQueryVersionReq);

    REQUEST_SIZE_MATCH(xDamageQueryVersionReq);
    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    if (stuff->majorVersion < SERVER_DAMAGE_MAJOR) {
        rep.majorVersion = stuff->majorVersion;
        rep.minorVersion = stuff->minorVersion;
    }
    else {
        rep.majorVersion = SERVER_DAMAGE_MAJOR;
        if (stuff->majorVersion == SERVER_DAMAGE_MAJOR &&
            stuff->minorVersion < SERVER_DAMAGE_MINOR)
            rep.minorVersion = stuff->minorVersion;
        else
            rep.minorVersion = SERVER_DAMAGE_MINOR;
    }
    pDamageClient->major_version = rep.majorVersion;
    pDamageClient->minor_version = rep.minorVersion;
    if (client->swapped) {
        swaps(&rep.sequenceNumber);
        swapl(&rep.length);
        swapl(&rep.majorVersion);
        swapl(&rep.minorVersion);
    }
    WriteToClient(client, sizeof(xDamageQueryVersionReply), (char *) &rep);
    return (client->noClientException);
}

static int
ProcDamageCreate(ClientPtr client)
{
    DrawablePtr pDrawable;
    DamageExtPtr pDamageExt;
    DamageReportLevel level;
    RegionPtr pRegion;

    REQUEST(xDamageCreateReq);

    REQUEST_SIZE_MATCH(xDamageCreateReq);
    LEGAL_NEW_RESOURCE(stuff->damage, client);
    SECURITY_VERIFY_DRAWABLE(pDrawable, stuff->drawable, client,
                             SecurityReadAccess);
    switch (stuff->level) {
    case XDamageReportRawRectangles:
        level = DamageReportRawRegion;
        break;
    case XDamageReportDeltaRectangles:
        level = DamageReportDeltaRegion;
        break;
    case XDamageReportBoundingBox:
        level = DamageReportBoundingBox;
        break;
    case XDamageReportNonEmpty:
        level = DamageReportNonEmpty;
        break;
    default:
        client->errorValue = stuff->level;
        return BadValue;
    }

    pDamageExt = malloc(sizeof(DamageExtRec));
    if (!pDamageExt)
        return BadAlloc;
    pDamageExt->id = stuff->damage;
    pDamageExt->pDrawable = pDrawable;
    pDamageExt->level = level;
    pDamageExt->pClient = client;
    pDamageExt->pDamage = DamageCreate(DamageExtReport,
                                       DamageExtDestroy,
                                       level,
                                       FALSE, pDrawable->pScreen, pDamageExt);
    if (!pDamageExt->pDamage) {
        free(pDamageExt);
        return BadAlloc;
    }
    if (!AddResource(stuff->damage, DamageExtType, (pointer) pDamageExt))
        return BadAlloc;

    DamageRegister(pDamageExt->pDrawable, pDamageExt->pDamage);

    if (pDrawable->type == DRAWABLE_WINDOW) {
        pRegion = &((WindowPtr) pDrawable)->borderClip;
        DamageDamageRegion(pDrawable, pRegion);
    }

    return (client->noClientException);
}

static int
ProcDamageDestroy(ClientPtr client)
{
    REQUEST(xDamageDestroyReq);
    DamageExtPtr pDamageExt;

    REQUEST_SIZE_MATCH(xDamageDestroyReq);
    VERIFY_DAMAGEEXT(pDamageExt, stuff->damage, client, SecurityWriteAccess);
    FreeResource(stuff->damage, RT_NONE);
    return (client->noClientException);
}

static int
ProcDamageSubtract(ClientPtr client)
{
    REQUEST(xDamageSubtractReq);
    DamageExtPtr pDamageExt;

    RegionPtr pRepair;

    RegionPtr pParts;

    REQUEST_SIZE_MATCH(xDamageSubtractReq);
    VERIFY_DAMAGEEXT(pDamageExt, stuff->damage, client, SecurityWriteAccess);
    VERIFY_REGION_OR_NONE(pRepair, stuff->repair, client, SecurityWriteAccess);
    VERIFY_REGION_OR_NONE(pParts, stuff->parts, client, SecurityWriteAccess);

    if (pDamageExt->level != DamageReportRawRegion) {
        DamagePtr pDamage = pDamageExt->pDamage;

        if (pRepair) {
            if (pParts)
                REGION_INTERSECT(pParts, DamageRegion(pDamage),
                                 pRepair);
            if (DamageSubtract(pDamage, pRepair))
                DamageExtReport(pDamage, DamageRegion(pDamage),
                                (void *) pDamageExt);
        }
        else {
            if (pParts)
                REGION_COPY(pParts, DamageRegion(pDamage));
            DamageEmpty(pDamage);
        }
    }
    return (client->noClientException);
}

static int
ProcDamageAdd(ClientPtr client)
{
    REQUEST(xDamageAddReq);
    DrawablePtr pDrawable;

    RegionPtr pRegion;

    REQUEST_SIZE_MATCH(xDamageAddReq);
    VERIFY_REGION(pRegion, stuff->region, client, SecurityWriteAccess);
    SECURITY_VERIFY_DRAWABLE(pDrawable, stuff->drawable, client,
                             SecurityReadAccess);

    /* The region is relative to the drawable origin, so translate it out to
     * screen coordinates like damage expects.
     */
    REGION_TRANSLATE(pRegion, pDrawable->x, pDrawable->y);
    DamageDamageRegion(pDrawable, pRegion);
    REGION_TRANSLATE(pRegion, -pDrawable->x, -pDrawable->y);

    return (client->noClientException);
}

/* Major version controls available requests */
static const int version_requests[] = {
    X_DamageQueryVersion,       /* before client sends QueryVersion */
    X_DamageAdd,                /* Version 1 */
};

#define NUM_VERSION_REQUESTS	(sizeof (version_requests) / sizeof (version_requests[0]))

int (*ProcDamageVector[XDamageNumberRequests]) (ClientPtr) = {
/*************** Version 1 ******************/
    ProcDamageQueryVersion,
        ProcDamageCreate, ProcDamageDestroy, ProcDamageSubtract,
/*************** Version 1.1 ****************/
ProcDamageAdd,};

static int
ProcDamageDispatch(ClientPtr client)
{
    REQUEST(xDamageReq);
    DamageClientPtr pDamageClient = GetDamageClient(client);

    if (pDamageClient->major_version >= NUM_VERSION_REQUESTS)
        return BadRequest;
    if (stuff->damageReqType > version_requests[pDamageClient->major_version])
        return BadRequest;
    return (*ProcDamageVector[stuff->damageReqType]) (client);
}

static int
SProcDamageQueryVersion(ClientPtr client)
{

    REQUEST(xDamageQueryVersionReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xDamageQueryVersionReq);
    swapl(&stuff->majorVersion);
    swapl(&stuff->minorVersion);
    return (*ProcDamageVector[stuff->damageReqType]) (client);
}

static int
SProcDamageCreate(ClientPtr client)
{

    REQUEST(xDamageCreateReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xDamageCreateReq);
    swapl(&stuff->damage);
    swapl(&stuff->drawable);
    return (*ProcDamageVector[stuff->damageReqType]) (client);
}

static int
SProcDamageDestroy(ClientPtr client)
{

    REQUEST(xDamageDestroyReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xDamageDestroyReq);
    swapl(&stuff->damage);
    return (*ProcDamageVector[stuff->damageReqType]) (client);
}

static int
SProcDamageSubtract(ClientPtr client)
{

    REQUEST(xDamageSubtractReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xDamageSubtractReq);
    swapl(&stuff->damage);
    swapl(&stuff->repair);
    swapl(&stuff->parts);
    return (*ProcDamageVector[stuff->damageReqType]) (client);
}

static int
SProcDamageAdd(ClientPtr client)
{

    REQUEST(xDamageAddReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xDamageSubtractReq);
    swapl(&stuff->drawable);
    swapl(&stuff->region);
    return (*ProcDamageVector[stuff->damageReqType]) (client);
}

int (*SProcDamageVector[XDamageNumberRequests]) (ClientPtr) = {
/*************** Version 1 ******************/
    SProcDamageQueryVersion,
        SProcDamageCreate, SProcDamageDestroy, SProcDamageSubtract,
/*************** Version 1.1 ****************/
SProcDamageAdd,};

static int
SProcDamageDispatch(ClientPtr client)
{
    REQUEST(xDamageReq);
    if (stuff->damageReqType >= XDamageNumberRequests)
        return BadRequest;
    return (*SProcDamageVector[stuff->damageReqType]) (client);
}

static void
DamageClientCallback(CallbackListPtr *list, pointer closure, pointer data)
{
    NewClientInfoRec *clientinfo = (NewClientInfoRec *) data;
    ClientPtr pClient = clientinfo->client;
    DamageClientPtr pDamageClient = GetDamageClient(pClient);

    pDamageClient->critical = 0;
    pDamageClient->major_version = 0;
    pDamageClient->minor_version = 0;
}

 /*ARGSUSED*/ static void
DamageResetProc(ExtensionEntry * extEntry)
{
    DeleteCallback(&ClientStateCallback, DamageClientCallback, 0);
}

static int
FreeDamageExt(pointer value, XID did)
{
    DamageExtPtr pDamageExt = (DamageExtPtr) value;

    /*
     * Get rid of the resource table entry hanging from the window id
     */
    pDamageExt->id = 0;
    if (WindowDrawable(pDamageExt->pDrawable->type))
        FreeResourceByType(pDamageExt->pDrawable->id, DamageExtWinType, TRUE);
    if (pDamageExt->pDamage) {
        DamageUnregister(pDamageExt->pDrawable, pDamageExt->pDamage);
        DamageDestroy(pDamageExt->pDamage);
    }
    free(pDamageExt);
    return Success;
}

static int
FreeDamageExtWin(pointer value, XID wid)
{
    DamageExtPtr pDamageExt = (DamageExtPtr) value;

    if (pDamageExt->id)
        FreeResource(pDamageExt->id, RT_NONE);
    return Success;
}

void
SDamageNotifyEvent(xDamageNotifyEvent * from, xDamageNotifyEvent * to)
{
    to->type = from->type;
    cpswaps(from->sequenceNumber, to->sequenceNumber);
    cpswapl(from->drawable, to->drawable);
    cpswapl(from->damage, to->damage);
    cpswaps(from->area.x, to->area.x);
    cpswaps(from->area.y, to->area.y);
    cpswaps(from->area.width, to->area.width);
    cpswaps(from->area.height, to->area.height);
    cpswaps(from->geometry.x, to->geometry.x);
    cpswaps(from->geometry.y, to->geometry.y);
    cpswaps(from->geometry.width, to->geometry.width);
    cpswaps(from->geometry.height, to->geometry.height);
}

void
DamageExtensionInit(void)
{
    ExtensionEntry *extEntry;

    int s;

    for (s = 0; s < screenInfo.numScreens; s++)
        DamageSetup(screenInfo.screens[s]);

    DamageExtType = CreateNewResourceType(FreeDamageExt);
    if (!DamageExtType)
        return;

    DamageExtWinType = CreateNewResourceType(FreeDamageExtWin);
    if (!DamageExtWinType)
        return;

    DamageClientPrivateIndex = AllocateClientPrivateIndex();
    if (!AllocateClientPrivate(DamageClientPrivateIndex,
                               sizeof(DamageClientRec)))
        return;
    if (!AddCallback(&ClientStateCallback, DamageClientCallback, 0))
        return;

    if ((extEntry = AddExtension(DAMAGE_NAME, XDamageNumberEvents,
                                 XDamageNumberErrors,
                                 ProcDamageDispatch, SProcDamageDispatch,
                                 DamageResetProc, StandardMinorOpcode)) != 0) {
        DamageReqCode = (unsigned char) extEntry->base;
        DamageEventBase = extEntry->eventBase;
        DamageErrorBase = extEntry->errorBase;
        EventSwapVector[DamageEventBase + XDamageNotify] =
            (EventSwapPtr) SDamageNotifyEvent;
    }
}