/*
 * Copyright © 2006 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 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.
 */
/*
 * This Xinerama implementation comes from the SiS driver which has
 * the following notice:
 */
/*
 * SiS driver main code
 *
 * Copyright (C) 2001-2005 by Thomas Winischhofer, Vienna, Austria.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1) Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2) Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3) The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: Thomas Winischhofer <thomas@winischhofer.net>
 *	- driver entirely rewritten since 2001, only basic structure taken from
 *	  old code (except sis_dri.c, sis_shadow.c, sis_accel.c and parts of
 *	  sis_dga.c; these were mostly taken over; sis_dri.c was changed for
 *	  new versions of the DRI layer)
 *
 * This notice covers the entire driver code unless indicated otherwise.
 *
 * Formerly based on code which was
 * 	     Copyright (C) 1998, 1999 by Alan Hourihane, Wigan, England.
 * 	     Written by:
 *           Alan Hourihane <alanh@fairlite.demon.co.uk>,
 *           Mike Chapman <mike@paranoia.com>,
 *           Juanjo Santamarta <santamarta@ctv.es>,
 *           Mitani Hiroshi <hmitani@drl.mei.co.jp>,
 *           David Thomas <davtom@dream.org.uk>.
 */

#include "randrstr.h"
#include "swaprep.h"
#include <X11/extensions/panoramiXproto.h>

#define RR_XINERAMA_MAJOR_VERSION   1
#define RR_XINERAMA_MINOR_VERSION   1

/* Xinerama is not multi-screen capable; just report about screen 0 */
#define RR_XINERAMA_SCREEN  0

static int ProcRRXineramaQueryVersion(ClientPtr client);
static int ProcRRXineramaGetState(ClientPtr client);
static int ProcRRXineramaGetScreenCount(ClientPtr client);
static int ProcRRXineramaGetScreenSize(ClientPtr client);
static int ProcRRXineramaIsActive(ClientPtr client);
static int ProcRRXineramaQueryScreens(ClientPtr client);
static int SProcRRXineramaDispatch(ClientPtr client);

/* Proc */

int
ProcRRXineramaQueryVersion(ClientPtr client)
{
    xPanoramiXQueryVersionReply rep;


    REQUEST_SIZE_MATCH(xPanoramiXQueryVersionReq);
    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    rep.majorVersion = RR_XINERAMA_MAJOR_VERSION;
    rep.minorVersion = RR_XINERAMA_MINOR_VERSION;
    if (client->swapped) {
        swaps(&rep.sequenceNumber);
        swapl(&rep.length);
        swaps(&rep.majorVersion);
        swaps(&rep.minorVersion);
    }
    WriteToClient(client, sizeof(xPanoramiXQueryVersionReply), (char *) &rep);
    return (client->noClientException);
}

int
ProcRRXineramaGetState(ClientPtr client)
{
    REQUEST(xPanoramiXGetStateReq);
    WindowPtr pWin;

    xPanoramiXGetStateReply rep;


    ScreenPtr pScreen;

    rrScrPrivPtr pScrPriv;

    Bool active = FALSE;

    REQUEST_SIZE_MATCH(xPanoramiXGetStateReq);
    pWin = LookupWindow(stuff->window, client);
    if (!pWin)
        return BadWindow;

    pScreen = pWin->drawable.pScreen;
    pScrPriv = rrGetScrPriv(pScreen);
    if (pScrPriv) {
        /* XXX do we need more than this? */
        active = TRUE;
    }

    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    rep.state = active;
    if (client->swapped) {
        swaps(&rep.sequenceNumber);
        swapl(&rep.length);
    }
    WriteToClient(client, sizeof(xPanoramiXGetStateReply), (char *) &rep);
    return client->noClientException;
}

static Bool
RRXineramaScreenActive(ScreenPtr pScreen)
{
    return rrGetScrPriv(pScreen) != NULL;
}

static Bool
RRXineramaCrtcActive(RRCrtcPtr crtc)
{
    return crtc->mode != NULL && crtc->numOutputs > 0;
}

static int
RRXineramaScreenCount(ScreenPtr pScreen)
{
    int i, n;

    n = 0;
    if (RRXineramaScreenActive(pScreen)) {
        rrScrPriv(pScreen);
        for (i = 0; i < pScrPriv->numCrtcs; i++)
            if (RRXineramaCrtcActive(pScrPriv->crtcs[i]))
                n++;
    }
    return n;
}

int
ProcRRXineramaGetScreenCount(ClientPtr client)
{
    REQUEST(xPanoramiXGetScreenCountReq);
    WindowPtr pWin;

    xPanoramiXGetScreenCountReply rep;


    REQUEST_SIZE_MATCH(xPanoramiXGetScreenCountReq);
    pWin = LookupWindow(stuff->window, client);
    if (!pWin)
        return BadWindow;

    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    rep.ScreenCount = RRXineramaScreenCount(pWin->drawable.pScreen);
    if (client->swapped) {
        swaps(&rep.sequenceNumber);
        swapl(&rep.length);
    }
    WriteToClient(client, sizeof(xPanoramiXGetScreenCountReply), (char *) &rep);
    return client->noClientException;
}

int
ProcRRXineramaGetScreenSize(ClientPtr client)
{
    REQUEST(xPanoramiXGetScreenSizeReq);
    WindowPtr pWin, pRoot;

    ScreenPtr pScreen;

    xPanoramiXGetScreenSizeReply rep;


    REQUEST_SIZE_MATCH(xPanoramiXGetScreenSizeReq);
    pWin = LookupWindow(stuff->window, client);
    if (!pWin)
        return BadWindow;

    pScreen = pWin->drawable.pScreen;
    pRoot = WindowTable[pScreen->myNum];

    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    rep.width = pRoot->drawable.width;
    rep.height = pRoot->drawable.height;
    if (client->swapped) {
        swaps(&rep.sequenceNumber);
        swapl(&rep.length);
        swapl(&rep.width);
        swapl(&rep.height);
    }
    WriteToClient(client, sizeof(xPanoramiXGetScreenSizeReply), (char *) &rep);
    return client->noClientException;
}

int
ProcRRXineramaIsActive(ClientPtr client)
{
    xXineramaIsActiveReply rep;

    REQUEST_SIZE_MATCH(xXineramaIsActiveReq);

    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    rep.state = RRXineramaScreenActive(screenInfo.screens[RR_XINERAMA_SCREEN]);
    if (client->swapped) {

        swaps(&rep.sequenceNumber);
        swapl(&rep.length);
        swapl(&rep.state);
    }
    WriteToClient(client, sizeof(xXineramaIsActiveReply), (char *) &rep);
    return client->noClientException;
}

int
ProcRRXineramaQueryScreens(ClientPtr client)
{
    xXineramaQueryScreensReply rep;

    ScreenPtr pScreen = screenInfo.screens[RR_XINERAMA_SCREEN];

    REQUEST_SIZE_MATCH(xXineramaQueryScreensReq);

    if (RRXineramaScreenActive(pScreen)) {
        rrScrPriv(pScreen);
        if (pScrPriv->numCrtcs == 0 || pScrPriv->numOutputs == 0)
            RRGetInfo(pScreen);
    }

    rep.type = X_Reply;
    rep.sequenceNumber = client->sequence;
    rep.number = RRXineramaScreenCount(pScreen);
    rep.length = rep.number * sz_XineramaScreenInfo >> 2;
    if (client->swapped) {

        swaps(&rep.sequenceNumber);
        swapl(&rep.length);
        swapl(&rep.number);
    }
    WriteToClient(client, sizeof(xXineramaQueryScreensReply), (char *) &rep);

    if (rep.number) {
        rrScrPriv(pScreen);
        xXineramaScreenInfo scratch;

        int i;

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

            if (RRXineramaCrtcActive(crtc)) {
                int width, height;

                RRCrtcGetScanoutSize(crtc, &width, &height);
                scratch.x_org = crtc->x;
                scratch.y_org = crtc->y;
                scratch.width = width;
                scratch.height = height;
                if (client->swapped) {

                    swaps(&scratch.x_org);
                    swaps(&scratch.y_org);
                    swaps(&scratch.width);
                    swaps(&scratch.height);
                }
                WriteToClient(client, sz_XineramaScreenInfo, (char *) &scratch);
            }
        }
    }

    return client->noClientException;
}

static int
ProcRRXineramaDispatch(ClientPtr client)
{
    REQUEST(xReq);
    switch (stuff->data) {
    case X_PanoramiXQueryVersion:
        return ProcRRXineramaQueryVersion(client);
    case X_PanoramiXGetState:
        return ProcRRXineramaGetState(client);
    case X_PanoramiXGetScreenCount:
        return ProcRRXineramaGetScreenCount(client);
    case X_PanoramiXGetScreenSize:
        return ProcRRXineramaGetScreenSize(client);
    case X_XineramaIsActive:
        return ProcRRXineramaIsActive(client);
    case X_XineramaQueryScreens:
        return ProcRRXineramaQueryScreens(client);
    }
    return BadRequest;
}

/* SProc */

static int
SProcRRXineramaQueryVersion(ClientPtr client)
{
    REQUEST(xPanoramiXQueryVersionReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xPanoramiXQueryVersionReq);
    return ProcRRXineramaQueryVersion(client);
}

static int
SProcRRXineramaGetState(ClientPtr client)
{
    REQUEST(xPanoramiXGetStateReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xPanoramiXGetStateReq);
    return ProcRRXineramaGetState(client);
}

static int
SProcRRXineramaGetScreenCount(ClientPtr client)
{
    REQUEST(xPanoramiXGetScreenCountReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xPanoramiXGetScreenCountReq);
    return ProcRRXineramaGetScreenCount(client);
}

static int
SProcRRXineramaGetScreenSize(ClientPtr client)
{
    REQUEST(xPanoramiXGetScreenSizeReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xPanoramiXGetScreenSizeReq);
    return ProcRRXineramaGetScreenSize(client);
}

static int
SProcRRXineramaIsActive(ClientPtr client)
{
    REQUEST(xXineramaIsActiveReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xXineramaIsActiveReq);
    return ProcRRXineramaIsActive(client);
}

static int
SProcRRXineramaQueryScreens(ClientPtr client)
{
    REQUEST(xXineramaQueryScreensReq);

    swaps(&stuff->length);
    REQUEST_SIZE_MATCH(xXineramaQueryScreensReq);
    return ProcRRXineramaQueryScreens(client);
}

int
SProcRRXineramaDispatch(ClientPtr client)
{
    REQUEST(xReq);
    switch (stuff->data) {
    case X_PanoramiXQueryVersion:
        return SProcRRXineramaQueryVersion(client);
    case X_PanoramiXGetState:
        return SProcRRXineramaGetState(client);
    case X_PanoramiXGetScreenCount:
        return SProcRRXineramaGetScreenCount(client);
    case X_PanoramiXGetScreenSize:
        return SProcRRXineramaGetScreenSize(client);
    case X_XineramaIsActive:
        return SProcRRXineramaIsActive(client);
    case X_XineramaQueryScreens:
        return SProcRRXineramaQueryScreens(client);
    }
    return BadRequest;
}

static void
RRXineramaResetProc(ExtensionEntry * extEntry)
{
}

void
RRXineramaExtensionInit(void)
{
    return;

    (void) AddExtension(PANORAMIX_PROTOCOL_NAME, 0, 0,
                        ProcRRXineramaDispatch,
                        SProcRRXineramaDispatch,
                        RRXineramaResetProc, StandardMinorOpcode);
}
