/*
 * Copyright © 2000 Compaq Computer Corporation
 * Copyright © 2002 Hewlett-Packard Company
 * Copyright © 2006 Intel Corporation
 *
 * 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 the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS 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.
 *
 * Author:  Jim Gettys, Hewlett-Packard Company, Inc.
 *	    Keith Packard, Intel Corporation
 */

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

#include "randrstr.h"

/* From render.h */
#ifndef SubPixelUnknown
#define SubPixelUnknown 0
#endif

#define RR_VALIDATE
static int RRNScreens;

#define wrap(priv,real,mem,func) {\
    priv->mem = real->mem; \
    real->mem = func; \
}

#define unwrap(priv,real,mem) {\
    real->mem = priv->mem; \
}

static int ProcRRDispatch(ClientPtr pClient);

static int SProcRRDispatch(ClientPtr pClient);

int RREventBase;

int RRErrorBase;

RESTYPE RRClientType, RREventType;      /* resource types for event masks */

int RRClientPrivateIndex;

int rrPrivIndex = -1;

static void
RRClientCallback(CallbackListPtr *list, pointer closure, pointer data)
{
    NewClientInfoRec *clientinfo = (NewClientInfoRec *) data;

    ClientPtr pClient = clientinfo->client;

    rrClientPriv(pClient);
    RRTimesPtr pTimes = (RRTimesPtr) (pRRClient + 1);

    int i;

    pRRClient->major_version = 0;
    pRRClient->minor_version = 0;
    for (i = 0; i < screenInfo.numScreens; i++) {
        ScreenPtr pScreen = screenInfo.screens[i];

        rrScrPriv(pScreen);

        if (pScrPriv) {
            pTimes[i].setTime = pScrPriv->lastSetTime;
            pTimes[i].configTime = pScrPriv->lastConfigTime;
        }
    }
}

static void
RRResetProc(ExtensionEntry * extEntry)
{
}

static Bool
RRCloseScreen(int i, ScreenPtr pScreen)
{
    rrScrPriv(pScreen);
    int j;

    unwrap(pScrPriv, pScreen, CloseScreen);
    for (j = pScrPriv->numCrtcs - 1; j >= 0; j--)
        RRCrtcDestroy(pScrPriv->crtcs[j]);
    for (j = pScrPriv->numOutputs - 1; j >= 0; j--)
        RROutputDestroy(pScrPriv->outputs[j]);

    free(pScrPriv);
    RRNScreens -= 1;            /* ok, one fewer screen with RandR running */
    return (*pScreen->CloseScreen) (i, pScreen);
}

static void
SRRScreenChangeNotifyEvent(xRRScreenChangeNotifyEvent * from,
                           xRRScreenChangeNotifyEvent * to)
{
    to->type = from->type;
    to->rotation = from->rotation;
    cpswaps(from->sequenceNumber, to->sequenceNumber);
    cpswapl(from->timestamp, to->timestamp);
    cpswapl(from->configTimestamp, to->configTimestamp);
    cpswapl(from->root, to->root);
    cpswapl(from->window, to->window);
    cpswaps(from->sizeID, to->sizeID);
    cpswaps(from->widthInPixels, to->widthInPixels);
    cpswaps(from->heightInPixels, to->heightInPixels);
    cpswaps(from->widthInMillimeters, to->widthInMillimeters);
    cpswaps(from->heightInMillimeters, to->heightInMillimeters);
    cpswaps(from->subpixelOrder, to->subpixelOrder);
}

static void
SRRCrtcChangeNotifyEvent(xRRCrtcChangeNotifyEvent * from,
                         xRRCrtcChangeNotifyEvent * to)
{
    to->type = from->type;
    to->subCode = from->subCode;
    cpswaps(from->sequenceNumber, to->sequenceNumber);
    cpswapl(from->timestamp, to->timestamp);
    cpswapl(from->window, to->window);
    cpswapl(from->crtc, to->crtc);
    cpswapl(from->mode, to->mode);
    cpswapl(from->window, to->window);
    cpswaps(from->rotation, to->rotation);
    cpswaps(from->x, to->x);
    cpswaps(from->y, to->y);
    cpswaps(from->width, to->width);
    cpswaps(from->height, to->height);
}

static void
SRROutputChangeNotifyEvent(xRROutputChangeNotifyEvent * from,
                           xRROutputChangeNotifyEvent * to)
{
    to->type = from->type;
    to->subCode = from->subCode;
    cpswaps(from->sequenceNumber, to->sequenceNumber);
    cpswapl(from->timestamp, to->timestamp);
    cpswapl(from->configTimestamp, to->configTimestamp);
    cpswapl(from->window, to->window);
    cpswapl(from->output, to->output);
    cpswapl(from->crtc, to->crtc);
    cpswapl(from->mode, to->mode);
    cpswaps(from->rotation, to->rotation);
}

static void
SRROutputPropertyNotifyEvent(xRROutputPropertyNotifyEvent * from,
                             xRROutputPropertyNotifyEvent * to)
{
    to->type = from->type;
    to->subCode = from->subCode;
    cpswaps(from->sequenceNumber, to->sequenceNumber);
    cpswapl(from->window, to->window);
    cpswapl(from->output, to->output);
    cpswapl(from->atom, to->atom);
    cpswapl(from->timestamp, to->timestamp);
}

static void
SRRNotifyEvent(xEvent *from, xEvent *to)
{
    switch (from->u.u.detail) {
    case RRNotify_CrtcChange:
        SRRCrtcChangeNotifyEvent((xRRCrtcChangeNotifyEvent *) from,
                                 (xRRCrtcChangeNotifyEvent *) to);
        break;
    case RRNotify_OutputChange:
        SRROutputChangeNotifyEvent((xRROutputChangeNotifyEvent *) from,
                                   (xRROutputChangeNotifyEvent *) to);
        break;
    case RRNotify_OutputProperty:
        SRROutputPropertyNotifyEvent((xRROutputPropertyNotifyEvent *) from,
                                     (xRROutputPropertyNotifyEvent *) to);
        break;
    default:
        break;
    }
}

static int RRGeneration;

Bool
RRInit(void)
{
    if (RRGeneration != serverGeneration) {
        if (!RRModeInit())
            return FALSE;
        if (!RRCrtcInit())
            return FALSE;
        if (!RROutputInit())
            return FALSE;
        RRGeneration = serverGeneration;
    }
    return TRUE;
}

static int RRScreenGeneration;

Bool
RRScreenInit(ScreenPtr pScreen)
{
    rrScrPrivPtr pScrPriv;

    if (!RRInit())
        return FALSE;

    if (RRScreenGeneration != serverGeneration) {
        if ((rrPrivIndex = AllocateScreenPrivateIndex()) < 0)
            return FALSE;
        RRScreenGeneration = serverGeneration;
    }

    pScrPriv = malloc(sizeof(rrScrPrivRec));
    if (!pScrPriv)
        return FALSE;

    SetRRScreen(pScreen, pScrPriv);

    /*
     * Calling function best set these function vectors
     */
    pScrPriv->rrGetInfo = 0;
    pScrPriv->maxWidth = pScrPriv->minWidth = pScreen->width;
    pScrPriv->maxHeight = pScrPriv->minHeight = pScreen->height;

    pScrPriv->width = pScreen->width;
    pScrPriv->height = pScreen->height;
    pScrPriv->mmWidth = pScreen->mmWidth;
    pScrPriv->mmHeight = pScreen->mmHeight;
#if RANDR_12_INTERFACE
    pScrPriv->rrScreenSetSize = NULL;
    pScrPriv->rrCrtcSet = NULL;
    pScrPriv->rrCrtcSetGamma = NULL;
#endif
#if RANDR_10_INTERFACE
    pScrPriv->rrSetConfig = 0;
    pScrPriv->rotations = RR_Rotate_0;
    pScrPriv->reqWidth = pScreen->width;
    pScrPriv->reqHeight = pScreen->height;
    pScrPriv->nSizes = 0;
    pScrPriv->pSizes = NULL;
    pScrPriv->rotation = RR_Rotate_0;
    pScrPriv->rate = 0;
    pScrPriv->size = 0;
#endif

    /*
     * This value doesn't really matter -- any client must call
     * GetScreenInfo before reading it which will automatically update
     * the time
     */
    pScrPriv->lastSetTime = currentTime;
    pScrPriv->lastConfigTime = currentTime;

    wrap(pScrPriv, pScreen, CloseScreen, RRCloseScreen);

    pScrPriv->numOutputs = 0;
    pScrPriv->outputs = NULL;
    pScrPriv->numCrtcs = 0;
    pScrPriv->crtcs = NULL;

    RRNScreens += 1;            /* keep count of screens that implement randr */
    return TRUE;
}

 /*ARGSUSED*/ static int
RRFreeClient(pointer data, XID id)
{
    RREventPtr pRREvent;

    WindowPtr pWin;

    RREventPtr *pHead, pCur, pPrev;

    pRREvent = (RREventPtr) data;
    pWin = pRREvent->window;
    pHead = (RREventPtr *) LookupIDByType(pWin->drawable.id, RREventType);
    if (pHead) {
        pPrev = 0;
        for (pCur = *pHead; pCur && pCur != pRREvent; pCur = pCur->next)
            pPrev = pCur;
        if (pCur) {
            if (pPrev)
                pPrev->next = pRREvent->next;
            else
                *pHead = pRREvent->next;
        }
    }
    free((pointer) pRREvent);
    return 1;
}

 /*ARGSUSED*/ static int
RRFreeEvents(pointer data, XID id)
{
    RREventPtr *pHead, pCur, pNext;

    pHead = (RREventPtr *) data;
    for (pCur = *pHead; pCur; pCur = pNext) {
        pNext = pCur->next;
        FreeResource(pCur->clientResource, RRClientType);
        free((pointer) pCur);
    }
    free((pointer) pHead);
    return 1;
}

void
RRExtensionInit(void)
{
    ExtensionEntry *extEntry;

    if (RRNScreens == 0)
        return;

    RRClientPrivateIndex = AllocateClientPrivateIndex();
    if (!AllocateClientPrivate(RRClientPrivateIndex,
                               sizeof(RRClientRec) +
                               screenInfo.numScreens * sizeof(RRTimesRec)))
        return;
    if (!AddCallback(&ClientStateCallback, RRClientCallback, 0))
        return;

    RRClientType = CreateNewResourceType(RRFreeClient);
    if (!RRClientType)
        return;
    RREventType = CreateNewResourceType(RRFreeEvents);
    if (!RREventType)
        return;
    extEntry = AddExtension(RANDR_NAME, RRNumberEvents, RRNumberErrors,
                            ProcRRDispatch, SProcRRDispatch,
                            RRResetProc, StandardMinorOpcode);
    if (!extEntry)
        return;
    RRErrorBase = extEntry->errorBase;
    RREventBase = extEntry->eventBase;
    EventSwapVector[RREventBase + RRScreenChangeNotify] = (EventSwapPtr)
        SRRScreenChangeNotifyEvent;
    EventSwapVector[RREventBase + RRNotify] = (EventSwapPtr)
        SRRNotifyEvent;

    RRXineramaExtensionInit();
}

static int
TellChanged(WindowPtr pWin, pointer value)
{
    RREventPtr *pHead, pRREvent;

    ClientPtr client;

    ScreenPtr pScreen = pWin->drawable.pScreen;

    rrScrPriv(pScreen);
    int i;

    pHead = (RREventPtr *) LookupIDByType(pWin->drawable.id, RREventType);
    if (!pHead)
        return WT_WALKCHILDREN;

    for (pRREvent = *pHead; pRREvent; pRREvent = pRREvent->next) {
        client = pRREvent->client;
        if (client == serverClient || client->clientGone)
            continue;

        if (pRREvent->mask & RRScreenChangeNotifyMask)
            RRDeliverScreenEvent(client, pWin, pScreen);

        if (pRREvent->mask & RRCrtcChangeNotifyMask) {
            for (i = 0; i < pScrPriv->numCrtcs; i++) {
                RRCrtcPtr crtc = pScrPriv->crtcs[i];

                if (crtc->changed)
                    RRDeliverCrtcEvent(client, pWin, crtc);
            }
        }

        if (pRREvent->mask & RROutputChangeNotifyMask) {
            for (i = 0; i < pScrPriv->numOutputs; i++) {
                RROutputPtr output = pScrPriv->outputs[i];

                if (output->changed)
                    RRDeliverOutputEvent(client, pWin, output);
            }
        }
    }
    return WT_WALKCHILDREN;
}

/*
 * Something changed; send events and adjust pointer position
 */
void
RRTellChanged(ScreenPtr pScreen)
{
    rrScrPriv(pScreen);
    int i;

    if (pScrPriv->changed) {
        UpdateCurrentTime();
        if (pScrPriv->configChanged) {
            pScrPriv->lastConfigTime = currentTime;
            pScrPriv->configChanged = FALSE;
        }
        pScrPriv->changed = FALSE;
        WalkTree(pScreen, TellChanged, (pointer) pScreen);
        for (i = 0; i < pScrPriv->numOutputs; i++)
            pScrPriv->outputs[i]->changed = FALSE;
        for (i = 0; i < pScrPriv->numCrtcs; i++)
            pScrPriv->crtcs[i]->changed = FALSE;
        if (pScrPriv->layoutChanged) {
            pScrPriv->layoutChanged = FALSE;
            RRPointerScreenConfigured(pScreen);
            RRSendConfigNotify(pScreen);
        }
    }
}

/*
 * Return the first output which is connected to an active CRTC
 * Used in emulating 1.0 behaviour
 */
RROutputPtr
RRFirstOutput(ScreenPtr pScreen)
{
    rrScrPriv(pScreen);
    RROutputPtr output;

    int i, j;

    for (i = 0; i < pScrPriv->numCrtcs; i++) {
        RRCrtcPtr crtc = pScrPriv->crtcs[i];

        for (j = 0; j < pScrPriv->numOutputs; j++) {
            output = pScrPriv->outputs[j];
            if (output->crtc == crtc)
                return output;
        }
    }
    return NULL;
}

CARD16
RRVerticalRefresh(xRRModeInfo * mode)
{
    CARD32 refresh;

    CARD32 dots = mode->hTotal * mode->vTotal;

    if (!dots)
        return 0;
    refresh = (mode->dotClock + dots / 2) / dots;
    if (refresh > 0xffff)
        refresh = 0xffff;
    return (CARD16) refresh;
}

static int
ProcRRDispatch(ClientPtr client)
{
    REQUEST(xReq);
    if (stuff->data >= RRNumberRequests || !ProcRandrVector[stuff->data])
        return BadRequest;
    return (*ProcRandrVector[stuff->data]) (client);
}

static int
SProcRRDispatch(ClientPtr client)
{
    REQUEST(xReq);
    if (stuff->data >= RRNumberRequests || !ProcRandrVector[stuff->data])
        return BadRequest;
    return (*SProcRandrVector[stuff->data]) (client);
}
