path: root/xorg-server/hw/kdrive/ephyr/ephyr.c

/*
 * Xephyr - A kdrive X server thats runs in a host X window.
 *          Authored by Matthew Allum <mallum@openedhand.com>
 * 
 * Copyright © 2004 Nokia 
 *
 * 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 Nokia not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission. Nokia makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * NOKIA DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL NOKIA 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_CONFIG_H
#include <kdrive-config.h>
#endif

#include <xcb/xcb_keysyms.h>
#include <X11/keysym.h>

#include "ephyr.h"

#include "inputstr.h"
#include "scrnintstr.h"
#include "ephyrlog.h"

#ifdef XF86DRI
#include <xcb/xf86dri.h>
#include "ephyrdri.h"
#include "ephyrdriext.h"
#include "ephyrglxext.h"
#endif                          /* XF86DRI */

#include "xkbsrv.h"

extern int KdTsPhyScreen;

KdKeyboardInfo *ephyrKbd;
KdPointerInfo *ephyrMouse;
EphyrKeySyms ephyrKeySyms;
Bool ephyrNoDRI = FALSE;
Bool ephyrNoXV = FALSE;

static int mouseState = 0;
static Rotation ephyrRandr = RR_Rotate_0;

typedef struct _EphyrInputPrivate {
    Bool enabled;
} EphyrKbdPrivate, EphyrPointerPrivate;

Bool EphyrWantGrayScale = 0;
Bool EphyrWantResize = 0;

Bool
host_has_extension(xcb_extension_t *extension)
{
    const xcb_query_extension_reply_t *rep;

    rep = xcb_get_extension_data(hostx_get_xcbconn(), extension);

    return rep && rep->present;
}

Bool
ephyrInitialize(KdCardInfo * card, EphyrPriv * priv)
{
#ifdef _MSC_VER
  __asm int 3;
#else
    OsSignal(SIGUSR1, hostx_handle_signal);
#endif  
    priv->base = 0;
    priv->bytes_per_line = 0;
    return TRUE;
}

Bool
ephyrCardInit(KdCardInfo * card)
{
    EphyrPriv *priv;

    priv = (EphyrPriv *) malloc(sizeof(EphyrPriv));
    if (!priv)
        return FALSE;

    if (!ephyrInitialize(card, priv)) {
        free(priv);
        return FALSE;
    }
    card->driver = priv;

    return TRUE;
}

Bool
ephyrScreenInitialize(KdScreenInfo *screen)
{
    EphyrScrPriv *scrpriv = screen->driver;
    int width = 640, height = 480;
    CARD32 redMask, greenMask, blueMask;

    if (hostx_want_screen_size(screen, &width, &height)
        || !screen->width || !screen->height) {
        screen->width = width;
        screen->height = height;
    }

    if (EphyrWantGrayScale)
        screen->fb.depth = 8;

    if (screen->fb.depth && screen->fb.depth != hostx_get_depth()) {
        if (screen->fb.depth < hostx_get_depth()
            && (screen->fb.depth == 24 || screen->fb.depth == 16
                || screen->fb.depth == 8)) {
            scrpriv->server_depth = screen->fb.depth;
        }
        else
            ErrorF
                ("\nXephyr: requested screen depth not supported, setting to match hosts.\n");
    }

    screen->fb.depth = hostx_get_server_depth(screen);
    screen->rate = 72;

    if (screen->fb.depth <= 8) {
        if (EphyrWantGrayScale)
            screen->fb.visuals = ((1 << StaticGray) | (1 << GrayScale));
        else
            screen->fb.visuals = ((1 << StaticGray) |
                                  (1 << GrayScale) |
                                  (1 << StaticColor) |
                                  (1 << PseudoColor) |
                                  (1 << TrueColor) | (1 << DirectColor));

        screen->fb.redMask = 0x00;
        screen->fb.greenMask = 0x00;
        screen->fb.blueMask = 0x00;
        screen->fb.depth = 8;
        screen->fb.bitsPerPixel = 8;
    }
    else {
        screen->fb.visuals = (1 << TrueColor);

        if (screen->fb.depth <= 15) {
            screen->fb.depth = 15;
            screen->fb.bitsPerPixel = 16;
        }
        else if (screen->fb.depth <= 16) {
            screen->fb.depth = 16;
            screen->fb.bitsPerPixel = 16;
        }
        else if (screen->fb.depth <= 24) {
            screen->fb.depth = 24;
            screen->fb.bitsPerPixel = 32;
        }
        else if (screen->fb.depth <= 30) {
            screen->fb.depth = 30;
            screen->fb.bitsPerPixel = 32;
        }
        else {
            ErrorF("\nXephyr: Unsupported screen depth %d\n", screen->fb.depth);
            return FALSE;
        }

        hostx_get_visual_masks(screen, &redMask, &greenMask, &blueMask);

        screen->fb.redMask = (Pixel) redMask;
        screen->fb.greenMask = (Pixel) greenMask;
        screen->fb.blueMask = (Pixel) blueMask;

    }

    scrpriv->randr = screen->randr;

    return ephyrMapFramebuffer(screen);
}

void *
ephyrWindowLinear(ScreenPtr pScreen,
                  CARD32 row,
                  CARD32 offset, int mode, CARD32 *size, void *closure)
{
    KdScreenPriv(pScreen);
    EphyrPriv *priv = pScreenPriv->card->driver;

    if (!pScreenPriv->enabled)
        return 0;

    *size = priv->bytes_per_line;
    return priv->base + row * priv->bytes_per_line + offset;
}

/**
 * Figure out display buffer size. If fakexa is enabled, allocate a larger
 * buffer so that fakexa has space to put offscreen pixmaps.
 */
int
ephyrBufferHeight(KdScreenInfo * screen)
{
    int buffer_height;

    if (ephyrFuncs.initAccel == NULL)
        buffer_height = screen->height;
    else
        buffer_height = 3 * screen->height;
    return buffer_height;
}

Bool
ephyrMapFramebuffer(KdScreenInfo * screen)
{
    EphyrScrPriv *scrpriv = screen->driver;
    EphyrPriv *priv = screen->card->driver;
    KdPointerMatrix m;
    int buffer_height;

    EPHYR_LOG("screen->width: %d, screen->height: %d index=%d",
              screen->width, screen->height, screen->mynum);

    /*
     * Use the rotation last applied to ourselves (in the Xephyr case the fb
     * coordinate system moves independently of the pointer coordiante system).
     */
    KdComputePointerMatrix(&m, ephyrRandr, screen->width, screen->height);
    KdSetPointerMatrix(&m);

    buffer_height = ephyrBufferHeight(screen);

    priv->base =
        hostx_screen_init(screen, screen->width, screen->height, buffer_height,
                          &priv->bytes_per_line, &screen->fb.bitsPerPixel);

    if ((scrpriv->randr & RR_Rotate_0) && !(scrpriv->randr & RR_Reflect_All)) {
        scrpriv->shadow = FALSE;

        screen->fb.byteStride = priv->bytes_per_line;
        screen->fb.pixelStride = screen->width;
        screen->fb.frameBuffer = (CARD8 *) (priv->base);
    }
    else {
        /* Rotated/Reflected so we need to use shadow fb */
        scrpriv->shadow = TRUE;

        EPHYR_LOG("allocing shadow");

        KdShadowFbAlloc(screen,
                        scrpriv->randr & (RR_Rotate_90 | RR_Rotate_270));
    }

    return TRUE;
}

void
ephyrSetScreenSizes(ScreenPtr pScreen)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;
    EphyrScrPriv *scrpriv = screen->driver;

    if (scrpriv->randr & (RR_Rotate_0 | RR_Rotate_180)) {
        pScreen->width = screen->width;
        pScreen->height = screen->height;
        pScreen->mmWidth = screen->width_mm;
        pScreen->mmHeight = screen->height_mm;
    }
    else {
        pScreen->width = screen->height;
        pScreen->height = screen->width;
        pScreen->mmWidth = screen->height_mm;
        pScreen->mmHeight = screen->width_mm;
    }
}

Bool
ephyrUnmapFramebuffer(KdScreenInfo * screen)
{
    EphyrScrPriv *scrpriv = screen->driver;

    if (scrpriv->shadow)
        KdShadowFbFree(screen);

    /* Note, priv->base will get freed when XImage recreated */

    return TRUE;
}

void
ephyrShadowUpdate(ScreenPtr pScreen, shadowBufPtr pBuf)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;

    EPHYR_LOG("slow paint");

    /* FIXME: Slow Rotated/Reflected updates could be much
     * much faster efficiently updating via tranforming 
     * pBuf->pDamage  regions     
     */
    shadowUpdateRotatePacked(pScreen, pBuf);
    hostx_paint_rect(screen, 0, 0, 0, 0, screen->width, screen->height);
}

static void
ephyrInternalDamageRedisplay(ScreenPtr pScreen)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;
    EphyrScrPriv *scrpriv = screen->driver;
    RegionPtr pRegion;

    if (!scrpriv || !scrpriv->pDamage)
        return;

    pRegion = DamageRegion(scrpriv->pDamage);

    if (RegionNotEmpty(pRegion)) {
        int nbox;
        BoxPtr pbox;

        nbox = RegionNumRects(pRegion);
        pbox = RegionRects(pRegion);

        while (nbox--) {
            hostx_paint_rect(screen,
                             pbox->x1, pbox->y1,
                             pbox->x1, pbox->y1,
                             pbox->x2 - pbox->x1, pbox->y2 - pbox->y1);
            pbox++;
        }
        DamageEmpty(scrpriv->pDamage);
    }
}

static void
ephyrInternalDamageBlockHandler(void *data, OSTimePtr pTimeout, void *pRead)
{
    ScreenPtr pScreen = (ScreenPtr) data;

    ephyrInternalDamageRedisplay(pScreen);
}

static void
ephyrInternalDamageWakeupHandler(void *data, int i, void *LastSelectMask)
{
    /* FIXME: Not needed ? */
}

Bool
ephyrSetInternalDamage(ScreenPtr pScreen)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;
    EphyrScrPriv *scrpriv = screen->driver;
    PixmapPtr pPixmap = NULL;

    scrpriv->pDamage = DamageCreate((DamageReportFunc) 0,
                                    (DamageDestroyFunc) 0,
                                    DamageReportNone, TRUE, pScreen, pScreen);

    if (!RegisterBlockAndWakeupHandlers(ephyrInternalDamageBlockHandler,
                                        ephyrInternalDamageWakeupHandler,
                                        (void *) pScreen))
        return FALSE;

    pPixmap = (*pScreen->GetScreenPixmap) (pScreen);

    DamageRegister(&pPixmap->drawable, scrpriv->pDamage);

    return TRUE;
}

void
ephyrUnsetInternalDamage(ScreenPtr pScreen)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;
    EphyrScrPriv *scrpriv = screen->driver;

    DamageDestroy(scrpriv->pDamage);

    RemoveBlockAndWakeupHandlers(ephyrInternalDamageBlockHandler,
                                 ephyrInternalDamageWakeupHandler,
                                 (void *) pScreen);
}

#ifdef RANDR
Bool
ephyrRandRGetInfo(ScreenPtr pScreen, Rotation * rotations)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;
    EphyrScrPriv *scrpriv = screen->driver;
    RRScreenSizePtr pSize;
    Rotation randr;
    int n = 0;

    struct {
        int width, height;
    } sizes[] = {
        {1600, 1200},
        {1400, 1050},
        {1280, 960},
        {1280, 1024},
        {1152, 864},
        {1024, 768},
        {832, 624},
        {800, 600},
        {720, 400},
        {480, 640},
        {640, 480},
        {640, 400},
        {320, 240},
        {240, 320},
        {160, 160},
        {0, 0}
    };

    EPHYR_LOG("mark");

    *rotations = RR_Rotate_All | RR_Reflect_All;

    if (!hostx_want_preexisting_window(screen)
        && !hostx_want_fullscreen()) {  /* only if no -parent switch */
        while (sizes[n].width != 0 && sizes[n].height != 0) {
            RRRegisterSize(pScreen,
                           sizes[n].width,
                           sizes[n].height,
                           (sizes[n].width * screen->width_mm) / screen->width,
                           (sizes[n].height * screen->height_mm) /
                           screen->height);
            n++;
        }
    }

    pSize = RRRegisterSize(pScreen,
                           screen->width,
                           screen->height, screen->width_mm, screen->height_mm);

    randr = KdSubRotation(scrpriv->randr, screen->randr);

    RRSetCurrentConfig(pScreen, randr, 0, pSize);

    return TRUE;
}

Bool
ephyrRandRSetConfig(ScreenPtr pScreen,
                    Rotation randr, int rate, RRScreenSizePtr pSize)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;
    EphyrScrPriv *scrpriv = screen->driver;
    Bool wasEnabled = pScreenPriv->enabled;
    EphyrScrPriv oldscr;
    int oldwidth, oldheight, oldmmwidth, oldmmheight;
    Bool oldshadow;
    int newwidth, newheight;

    if (screen->randr & (RR_Rotate_0 | RR_Rotate_180)) {
        newwidth = pSize->width;
        newheight = pSize->height;
    }
    else {
        newwidth = pSize->height;
        newheight = pSize->width;
    }

    if (wasEnabled)
        KdDisableScreen(pScreen);

    oldscr = *scrpriv;

    oldwidth = screen->width;
    oldheight = screen->height;
    oldmmwidth = pScreen->mmWidth;
    oldmmheight = pScreen->mmHeight;
    oldshadow = scrpriv->shadow;

    /*
     * Set new configuration
     */

    /*
     * We need to store the rotation value for pointer coords transformation;
     * though initially the pointer and fb rotation are identical, when we map
     * the fb, the screen will be reinitialized and return into an unrotated
     * state (presumably the HW is taking care of the rotation of the fb), but the
     * pointer still needs to be transformed.
     */
    ephyrRandr = KdAddRotation(screen->randr, randr);
    scrpriv->randr = ephyrRandr;

    ephyrUnmapFramebuffer(screen);

    screen->width = newwidth;
    screen->height = newheight;

    if (!ephyrMapFramebuffer(screen))
        goto bail4;

    /* FIXME below should go in own call */

    if (oldshadow)
        KdShadowUnset(screen->pScreen);
    else
        ephyrUnsetInternalDamage(screen->pScreen);

    if (scrpriv->shadow) {
        if (!KdShadowSet(screen->pScreen,
                         scrpriv->randr, ephyrShadowUpdate, ephyrWindowLinear))
            goto bail4;
    }
    else {
        /* Without shadow fb ( non rotated ) we need 
         * to use damage to efficiently update display
         * via signal regions what to copy from 'fb'.
         */
        if (!ephyrSetInternalDamage(screen->pScreen))
            goto bail4;
    }

    ephyrSetScreenSizes(screen->pScreen);

    /*
     * Set frame buffer mapping
     */
    (*pScreen->ModifyPixmapHeader) (fbGetScreenPixmap(pScreen),
                                    pScreen->width,
                                    pScreen->height,
                                    screen->fb.depth,
                                    screen->fb.bitsPerPixel,
                                    screen->fb.byteStride,
                                    screen->fb.frameBuffer);

    /* set the subpixel order */

    KdSetSubpixelOrder(pScreen, scrpriv->randr);

    if (wasEnabled)
        KdEnableScreen(pScreen);

    RRScreenSizeNotify(pScreen);

    return TRUE;

 bail4:
    EPHYR_LOG("bailed");

    ephyrUnmapFramebuffer(screen);
    *scrpriv = oldscr;
    (void) ephyrMapFramebuffer(screen);

    pScreen->width = oldwidth;
    pScreen->height = oldheight;
    pScreen->mmWidth = oldmmwidth;
    pScreen->mmHeight = oldmmheight;

    if (wasEnabled)
        KdEnableScreen(pScreen);
    return FALSE;
}

Bool
ephyrRandRInit(ScreenPtr pScreen)
{
    rrScrPrivPtr pScrPriv;

    if (!RRScreenInit(pScreen))
        return FALSE;

    pScrPriv = rrGetScrPriv(pScreen);
    pScrPriv->rrGetInfo = ephyrRandRGetInfo;
    pScrPriv->rrSetConfig = ephyrRandRSetConfig;
    return TRUE;
}

static Bool
ephyrResizeScreen (ScreenPtr           pScreen,
                  int                  newwidth,
                  int                  newheight)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;
    RRScreenSize size = {0};
    Bool ret;
    int t;

    if (screen->randr & (RR_Rotate_90|RR_Rotate_270)) {
        t = newwidth;
        newwidth = newheight;
        newheight = t;
    }

    if (newwidth == screen->width && newheight == screen->height) {
        return FALSE;
    }

    size.width = newwidth;
    size.height = newheight;

    ret = ephyrRandRSetConfig (pScreen, screen->randr, 0, &size);
    if (ret) {
        RROutputPtr output;

        output = RRFirstOutput(pScreen);
        if (!output)
            return FALSE;
        RROutputSetModes(output, NULL, 0, 0);
    }

    return ret;
}
#endif

Bool
ephyrCreateColormap(ColormapPtr pmap)
{
    return fbInitializeColormap(pmap);
}

Bool
ephyrInitScreen(ScreenPtr pScreen)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;

    EPHYR_LOG("pScreen->myNum:%d\n", pScreen->myNum);
    hostx_set_screen_number(screen, pScreen->myNum);
    hostx_set_win_title(screen, "(ctrl+shift grabs mouse and keyboard)");
    pScreen->CreateColormap = ephyrCreateColormap;

#ifdef XV
    if (!ephyrNoXV) {
        if (!ephyrInitVideo(pScreen)) {
            EPHYR_LOG_ERROR("failed to initialize xvideo\n");
        }
        else {
            EPHYR_LOG("initialized xvideo okay\n");
        }
    }
#endif /*XV*/
#ifdef XF86DRI
    if (!ephyrNoDRI && !host_has_extension(&xcb_xf86dri_id)) {
        EPHYR_LOG("host x does not support DRI. Disabling DRI forwarding\n");
        ephyrNoDRI = TRUE;
    }
    if (!ephyrNoDRI) {
        ephyrDRIExtensionInit(pScreen);
        ephyrHijackGLXExtension();
    }
#endif

    return TRUE;
}

Bool
ephyrFinishInitScreen(ScreenPtr pScreen)
{
    /* FIXME: Calling this even if not using shadow.  
     * Seems harmless enough. But may be safer elsewhere.
     */
    if (!shadowSetup(pScreen))
        return FALSE;

#ifdef RANDR
    if (!ephyrRandRInit(pScreen))
        return FALSE;
#endif

    return TRUE;
}

Bool
ephyrCreateResources(ScreenPtr pScreen)
{
    KdScreenPriv(pScreen);
    KdScreenInfo *screen = pScreenPriv->screen;
    EphyrScrPriv *scrpriv = screen->driver;

    EPHYR_LOG("mark pScreen=%p mynum=%d shadow=%d",
              pScreen, pScreen->myNum, scrpriv->shadow);

    if (scrpriv->shadow)
        return KdShadowSet(pScreen,
                           scrpriv->randr,
                           ephyrShadowUpdate, ephyrWindowLinear);
    else
        return ephyrSetInternalDamage(pScreen);
}

void
ephyrPreserve(KdCardInfo * card)
{
}

Bool
ephyrEnable(ScreenPtr pScreen)
{
    return TRUE;
}

Bool
ephyrDPMS(ScreenPtr pScreen, int mode)
{
    return TRUE;
}

void
ephyrDisable(ScreenPtr pScreen)
{
}

void
ephyrRestore(KdCardInfo * card)
{
}

void
ephyrScreenFini(KdScreenInfo * screen)
{
    EphyrScrPriv *scrpriv = screen->driver;

    if (scrpriv->shadow) {
        KdShadowFbFree(screen);
    }
}

/*  
 * Port of Mark McLoughlin's Xnest fix for focus in + modifier bug.
 * See https://bugs.freedesktop.org/show_bug.cgi?id=3030
 */
void
ephyrUpdateModifierState(unsigned int state)
{

    DeviceIntPtr pDev = inputInfo.keyboard;
    KeyClassPtr keyc = pDev->key;
    int i;
    CARD8 mask;
    int xkb_state;

    if (!pDev)
        return;

    xkb_state = XkbStateFieldFromRec(&pDev->key->xkbInfo->state);
    state = state & 0xff;

    if (xkb_state == state)
        return;

    for (i = 0, mask = 1; i < 8; i++, mask <<= 1) {
        int key;

        /* Modifier is down, but shouldn't be
         */
        if ((xkb_state & mask) && !(state & mask)) {
            int count = keyc->modifierKeyCount[i];

            for (key = 0; key < MAP_LENGTH; key++)
                if (keyc->xkbInfo->desc->map->modmap[key] & mask) {
                    if (key_is_down(pDev, key, KEY_PROCESSED))
                        KdEnqueueKeyboardEvent(ephyrKbd, key, TRUE);

                    if (--count == 0)
                        break;
                }
        }

        /* Modifier shoud be down, but isn't
         */
        if (!(xkb_state & mask) && (state & mask))
            for (key = 0; key < MAP_LENGTH; key++)
                if (keyc->xkbInfo->desc->map->modmap[key] & mask) {
                    KdEnqueueKeyboardEvent(ephyrKbd, key, FALSE);
                    break;
                }
    }
}

#ifdef _MSC_VER
    __asm int 3;
#else
#endif
#ifdef _MSC_VER
    __asm int 3;
#else
#endif
static Bool
ephyrCursorOffScreen(ScreenPtr *ppScreen, int *x, int *y)
{
    return FALSE;
}

static void
ephyrCrossScreen(ScreenPtr pScreen, Bool entering)
{
}

ScreenPtr ephyrCursorScreen; /* screen containing the cursor */

static void
ephyrWarpCursor(DeviceIntPtr pDev, ScreenPtr pScreen, int x, int y)
{
    OsBlockSIGIO();
    ephyrCursorScreen = pScreen;
    miPointerWarpCursor(inputInfo.pointer, pScreen, x, y);

    OsReleaseSIGIO();
}

miPointerScreenFuncRec ephyrPointerScreenFuncs = {
    ephyrCursorOffScreen,
    ephyrCrossScreen,
    ephyrWarpCursor,
};

#ifdef XF86DRI
/**
 * find if the remote window denoted by a_remote
 * is paired with an internal Window within the Xephyr server.
 * If the remove window is paired with an internal window, send an
 * expose event to the client insterested in the internal window expose event.
 *
 * Pairing happens when a drawable inside Xephyr is associated with
 * a GL surface in a DRI environment.
 * Look at the function ProcXF86DRICreateDrawable in ephyrdriext.c to
 * know a paired window is created.
 *
 * This is useful to make GL drawables (only windows for now) handle
 * expose events and send those events to clients.
 */
static void
ephyrExposePairedWindow(int a_remote)
{
    EphyrWindowPair *pair = NULL;
    RegionRec reg;
    ScreenPtr screen;

    if (!findWindowPairFromRemote(a_remote, &pair)) {
        EPHYR_LOG("did not find a pair for this window\n");
        return;
    }
    screen = pair->local->drawable.pScreen;
    RegionNull(&reg);
    RegionCopy(&reg, &pair->local->clipList);
    screen->WindowExposures(pair->local, &reg, NullRegion);
    RegionUninit(&reg);
}
#endif                          /* XF86DRI */

static KdScreenInfo *
screen_from_window(Window w)
{
    int i = 0;

    for (i = 0; i < screenInfo.numScreens; i++) {
        ScreenPtr pScreen = screenInfo.screens[i];
        KdPrivScreenPtr kdscrpriv = KdGetScreenPriv(pScreen);
        KdScreenInfo *screen = kdscrpriv->screen;
        EphyrScrPriv *scrpriv = screen->driver;

        if (scrpriv->win == w
            || scrpriv->peer_win == w
            || scrpriv->win_pre_existing == w) {
            return screen;
        }
    }

    return NULL;
}

static void
ephyrProcessErrorEvent(xcb_generic_event_t *xev)
{
    xcb_generic_error_t *e = (xcb_generic_error_t *)xev;

    FatalError("X11 error\n"
               "Error code: %hhu\n"
               "Sequence number: %hu\n"
               "Major code: %hhu\tMinor code: %hu\n"
               "Error value: %u\n",
               e->error_code,
               e->sequence,
               e->major_code, e->minor_code,
               e->resource_id);
}

static void
ephyrProcessExpose(xcb_generic_event_t *xev)
{
    xcb_expose_event_t *expose = (xcb_expose_event_t *)xev;
    KdScreenInfo *screen = screen_from_window(expose->window);
    EphyrScrPriv *scrpriv = screen->driver;

    /* Wait for the last expose event in a series of cliprects
     * to actually paint our screen.
     */
    if (expose->count != 0)
        return;

    if (scrpriv) {
        hostx_paint_rect(scrpriv->screen, 0, 0, 0, 0,
                         scrpriv->win_width,
                         scrpriv->win_height);
    } else {
        EPHYR_LOG_ERROR("failed to get host screen\n");
#ifdef XF86DRI
        /*
         * We only receive expose events when the expose event
         * have be generated for a drawable that is a host X
         * window managed by Xephyr. Host X windows managed by
         * Xephyr exists for instance when Xephyr is asked to
         * create a GL drawable in a DRI environment.
         */
        ephyrExposePairedWindow(expose->window);
#endif                          /* XF86DRI */
    }
}

static void
ephyrProcessMouseMotion(xcb_generic_event_t *xev)
{
    xcb_motion_notify_event_t *motion = (xcb_motion_notify_event_t *)xev;
    KdScreenInfo *screen = screen_from_window(motion->event);

    if (!ephyrMouse ||
        !((EphyrPointerPrivate *) ephyrMouse->driverPrivate)->enabled) {
        EPHYR_LOG("skipping mouse motion:%d\n", screen->pScreen->myNum);
        return;
    }

    if (ephyrCursorScreen != screen->pScreen) {
        EPHYR_LOG("warping mouse cursor. "
                  "cur_screen%d, motion_screen:%d\n",
                  ephyrCursorScreen, screen->pScreen->myNum);
        ephyrWarpCursor(inputInfo.pointer, screen->pScreen,
                        motion->event_x, motion->event_y);
    }
    else {
        int x = 0, y = 0;

#ifdef XF86DRI
        EphyrWindowPair *pair = NULL;
#endif
        EPHYR_LOG("enqueuing mouse motion:%d\n", screen->pScreen->myNum);
        x = motion->event_x;
        y = motion->event_y;
        EPHYR_LOG("initial (x,y):(%d,%d)\n", x, y);
#ifdef XF86DRI
        EPHYR_LOG("is this window peered by a gl drawable ?\n");
        if (findWindowPairFromRemote(motion->event, &pair)) {
            EPHYR_LOG("yes, it is peered\n");
            x += pair->local->drawable.x;
            y += pair->local->drawable.y;
        }
        else {
            EPHYR_LOG("no, it is not peered\n");
        }
        EPHYR_LOG("final (x,y):(%d,%d)\n", x, y);
#endif

        /* convert coords into desktop-wide coordinates.
         * fill_pointer_events will convert that back to
         * per-screen coordinates where needed */
        x += screen->pScreen->x;
        y += screen->pScreen->y;

        KdEnqueuePointerEvent(ephyrMouse, mouseState | KD_POINTER_DESKTOP, x, y, 0);
    }
}

static void
ephyrProcessButtonPress(xcb_generic_event_t *xev)
{
    xcb_button_press_event_t *button = (xcb_button_press_event_t *)xev;

    if (!ephyrMouse ||
        !((EphyrPointerPrivate *) ephyrMouse->driverPrivate)->enabled) {
        EPHYR_LOG("skipping mouse press:%d\n", screen_from_window(button->event)->pScreen->myNum);
        return;
    }

    ephyrUpdateModifierState(button->state);
    /* This is a bit hacky. will break for button 5 ( defined as 0x10 )
     * Check KD_BUTTON defines in kdrive.h
     */
    mouseState |= 1 << (button->detail - 1);

    EPHYR_LOG("enqueuing mouse press:%d\n", screen_from_window(button->event)->pScreen->myNum);
    KdEnqueuePointerEvent(ephyrMouse, mouseState | KD_MOUSE_DELTA, 0, 0, 0);
}

static void
ephyrProcessButtonRelease(xcb_generic_event_t *xev)
{
    xcb_button_press_event_t *button = (xcb_button_press_event_t *)xev;

    if (!ephyrMouse ||
        !((EphyrPointerPrivate *) ephyrMouse->driverPrivate)->enabled) {
        return;
    }

    ephyrUpdateModifierState(button->state);
    mouseState &= ~(1 << (button->detail - 1));

    EPHYR_LOG("enqueuing mouse release:%d\n", screen_from_window(button->event)->pScreen->myNum);
    KdEnqueuePointerEvent(ephyrMouse, mouseState | KD_MOUSE_DELTA, 0, 0, 0);
}

/* Xephyr wants ctrl+shift to grab the window, but that conflicts with
   ctrl+alt+shift key combos. Remember the modifier state on key presses and
   releases, if mod1 is pressed, we need ctrl, shift and mod1 released
   before we allow a shift-ctrl grab activation.

   note: a key event contains the mask _before_ the current key takes
   effect, so mod1_was_down will be reset on the first key press after all
   three were released, not on the last release. That'd require some more
   effort.
 */
static int
ephyrUpdateGrabModifierState(int state)
{
    static int mod1_was_down = 0;

    if ((state & (XCB_MOD_MASK_CONTROL|XCB_MOD_MASK_SHIFT|XCB_MOD_MASK_1)) == 0)
        mod1_was_down = 0;
    else if (state & XCB_MOD_MASK_1)
        mod1_was_down = 1;

    return mod1_was_down;
}

static void
ephyrProcessKeyPress(xcb_generic_event_t *xev)
{
    xcb_key_press_event_t *key = (xcb_key_press_event_t *)xev;

    if (!ephyrKbd ||
        !((EphyrKbdPrivate *) ephyrKbd->driverPrivate)->enabled) {
        return;
    }

    ephyrUpdateGrabModifierState(key->state);
    ephyrUpdateModifierState(key->state);
    KdEnqueueKeyboardEvent(ephyrKbd, key->detail, FALSE);
}

static void
ephyrProcessKeyRelease(xcb_generic_event_t *xev)
{
    xcb_connection_t *conn = hostx_get_xcbconn();
    xcb_key_release_event_t *key = (xcb_key_release_event_t *)xev;
    static xcb_key_symbols_t *keysyms;
    static int grabbed_screen = -1;
    int mod1_down = ephyrUpdateGrabModifierState(key->state);

    if (!keysyms)
        keysyms = xcb_key_symbols_alloc(conn);

    if (((xcb_key_symbols_get_keysym(keysyms, key->detail, 0) == XK_Shift_L
          || xcb_key_symbols_get_keysym(keysyms, key->detail, 0) == XK_Shift_R)
         && (key->state & XCB_MOD_MASK_CONTROL)) ||
        ((xcb_key_symbols_get_keysym(keysyms, key->detail, 0) == XK_Control_L
          || xcb_key_symbols_get_keysym(keysyms, key->detail, 0) == XK_Control_R)
         && (key->state & XCB_MOD_MASK_SHIFT))) {
        KdScreenInfo *screen = screen_from_window(key->event);
        EphyrScrPriv *scrpriv = screen->driver;

        if (grabbed_screen != -1) {
            xcb_ungrab_keyboard(conn, XCB_TIME_CURRENT_TIME);
            xcb_ungrab_pointer(conn, XCB_TIME_CURRENT_TIME);
            grabbed_screen = -1;
            hostx_set_win_title(screen,
                                "(ctrl+shift grabs mouse and keyboard)");
        }
        else if (!mod1_down) {
            /* Attempt grab */
            xcb_grab_keyboard_cookie_t kbgrabc =
                xcb_grab_keyboard(conn,
                                  TRUE,
                                  scrpriv->win,
                                  XCB_TIME_CURRENT_TIME,
                                  XCB_GRAB_MODE_ASYNC,
                                  XCB_GRAB_MODE_ASYNC);
            xcb_grab_keyboard_reply_t *kbgrabr;
            xcb_grab_pointer_cookie_t pgrabc =
                xcb_grab_pointer(conn,
                                 TRUE,
                                 scrpriv->win,
                                 0,
                                 XCB_GRAB_MODE_ASYNC,
                                 XCB_GRAB_MODE_ASYNC,
                                 scrpriv->win,
                                 XCB_NONE,
                                 XCB_TIME_CURRENT_TIME);
            xcb_grab_pointer_reply_t *pgrabr;
            kbgrabr = xcb_grab_keyboard_reply(conn, kbgrabc, NULL);
            if (!kbgrabr || kbgrabr->status != XCB_GRAB_STATUS_SUCCESS) {
                xcb_discard_reply(conn, pgrabc.sequence);
                xcb_ungrab_pointer(conn, XCB_TIME_CURRENT_TIME);
            } else {
                pgrabr = xcb_grab_pointer_reply(conn, pgrabc, NULL);
                if (!pgrabr || pgrabr->status != XCB_GRAB_STATUS_SUCCESS)
                    {
                        xcb_ungrab_keyboard(conn,
                                            XCB_TIME_CURRENT_TIME);
                    } else {
                    grabbed_screen = scrpriv->mynum;
                    hostx_set_win_title
                        (screen,
                         "(ctrl+shift releases mouse and keyboard)");
                }
            }
        }
    }

    if (!ephyrKbd ||
        !((EphyrKbdPrivate *) ephyrKbd->driverPrivate)->enabled) {
        return;
    }

    /* Still send the release event even if above has happened server
     * will get confused with just an up event.  Maybe it would be
     * better to just block shift+ctrls getting to kdrive all
     * together.
     */
    ephyrUpdateModifierState(key->state);
    KdEnqueueKeyboardEvent(ephyrKbd, key->detail, TRUE);
}

static void
ephyrProcessConfigureNotify(xcb_generic_event_t *xev)
{
    xcb_configure_notify_event_t *configure =
        (xcb_configure_notify_event_t *)xev;
    KdScreenInfo *screen = screen_from_window(configure->window);
    EphyrScrPriv *scrpriv = screen->driver;

    if (!scrpriv ||
        (scrpriv->win_pre_existing == None && !EphyrWantResize)) {
        return;
    }

#ifdef RANDR
    ephyrResizeScreen(screen->pScreen, configure->width, configure->height);
#endif /* RANDR */
}

void
ephyrPoll(void)
{
    xcb_connection_t *conn = hostx_get_xcbconn();

    while (TRUE) {
        xcb_generic_event_t *xev = xcb_poll_for_event(conn);
        if (!xev) {
            /* If our XCB connection has died (for example, our window was
             * closed), exit now.
             */
            if (xcb_connection_has_error(conn)) {
                CloseWellKnownConnections();
                OsCleanup(1);
                exit(1);
            }

            break;
        }

        switch (xev->response_type & 0x7f) {
        case 0:
            ephyrProcessErrorEvent(xev);
            break;

        case XCB_EXPOSE:
            ephyrProcessExpose(xev);
            break;

        case XCB_MOTION_NOTIFY:
            ephyrProcessMouseMotion(xev);
            break;

        case XCB_KEY_PRESS:
            ephyrProcessKeyPress(xev);
            break;

        case XCB_KEY_RELEASE:
            ephyrProcessKeyRelease(xev);
            break;

        case XCB_BUTTON_PRESS:
            ephyrProcessButtonPress(xev);
            break;

        case XCB_BUTTON_RELEASE:
            ephyrProcessButtonRelease(xev);
            break;

        case XCB_CONFIGURE_NOTIFY:
            ephyrProcessConfigureNotify(xev);
            break;
        }

        free(xev);
    }
}

void
ephyrCardFini(KdCardInfo * card)
{
    EphyrPriv *priv = card->driver;

    free(priv);
}

void
ephyrGetColors(ScreenPtr pScreen, int n, xColorItem * pdefs)
{
    /* XXX Not sure if this is right */

    EPHYR_LOG("mark");

    while (n--) {
        pdefs->red = 0;
        pdefs->green = 0;
        pdefs->blue = 0;
        pdefs++;
    }

}

void
ephyrPutColors(ScreenPtr pScreen, int n, xColorItem * pdefs)
{
    int min, max, p;

    /* XXX Not sure if this is right */

    min = 256;
    max = 0;

    while (n--) {
        p = pdefs->pixel;
        if (p < min)
            min = p;
        if (p > max)
            max = p;

        hostx_set_cmap_entry(p,
                             pdefs->red >> 8,
                             pdefs->green >> 8, pdefs->blue >> 8);
        pdefs++;
    }
}

/* Mouse calls */

static Status
MouseInit(KdPointerInfo * pi)
{
    pi->driverPrivate = (EphyrPointerPrivate *)
        calloc(sizeof(EphyrPointerPrivate), 1);
    ((EphyrPointerPrivate *) pi->driverPrivate)->enabled = FALSE;
    pi->nAxes = 3;
    pi->nButtons = 32;
    free(pi->name);
    pi->name = strdup("Xephyr virtual mouse");

    /*
     * Must transform pointer coords since the pointer position
     * relative to the Xephyr window is controlled by the host server and
     * remains constant regardless of any rotation applied to the Xephyr screen.
     */
    pi->transformCoordinates = TRUE;

    ephyrMouse = pi;
    return Success;
}

static Status
MouseEnable(KdPointerInfo * pi)
{
    ((EphyrPointerPrivate *) pi->driverPrivate)->enabled = TRUE;
    return Success;
}

static void
MouseDisable(KdPointerInfo * pi)
{
    ((EphyrPointerPrivate *) pi->driverPrivate)->enabled = FALSE;
    return;
}

static void
MouseFini(KdPointerInfo * pi)
{
    ephyrMouse = NULL;
    return;
}

KdPointerDriver EphyrMouseDriver = {
    "ephyr",
    MouseInit,
    MouseEnable,
    MouseDisable,
    MouseFini,
    NULL,
};

/* Keyboard */

static Status
EphyrKeyboardInit(KdKeyboardInfo * ki)
{
    ki->driverPrivate = (EphyrKbdPrivate *)
        calloc(sizeof(EphyrKbdPrivate), 1);
    hostx_load_keymap();
    if (!ephyrKeySyms.minKeyCode) {
        ErrorF("Couldn't load keymap from host\n");
        return BadAlloc;
    }
    ki->minScanCode = ephyrKeySyms.minKeyCode;
    ki->maxScanCode = ephyrKeySyms.maxKeyCode;
    free(ki->name);
    ki->name = strdup("Xephyr virtual keyboard");
    ephyrKbd = ki;
    return Success;
}

static Status
EphyrKeyboardEnable(KdKeyboardInfo * ki)
{
    ((EphyrKbdPrivate *) ki->driverPrivate)->enabled = TRUE;

    return Success;
}

static void
EphyrKeyboardDisable(KdKeyboardInfo * ki)
{
    ((EphyrKbdPrivate *) ki->driverPrivate)->enabled = FALSE;
}

static void
EphyrKeyboardFini(KdKeyboardInfo * ki)
{
    ephyrKbd = NULL;
    return;
}

static void
EphyrKeyboardLeds(KdKeyboardInfo * ki, int leds)
{
}

static void
EphyrKeyboardBell(KdKeyboardInfo * ki, int volume, int frequency, int duration)
{
}

KdKeyboardDriver EphyrKeyboardDriver = {
    "ephyr",
    EphyrKeyboardInit,
    EphyrKeyboardEnable,
    EphyrKeyboardLeds,
    EphyrKeyboardBell,
    EphyrKeyboardDisable,
    EphyrKeyboardFini,
    NULL,
};