/*
 * Copyright 2001-2004 Red Hat Inc., Durham, North Carolina.
 *
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation on the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * Authors:
 *   Kevin E. Martin <kem@redhat.com>
 *   David H. Dawes <dawes@xfree86.org>
 *
 */

/** \file
 * This file provides support for screen initialization. */

#ifdef HAVE_DMX_CONFIG_H
#include <dmx-config.h>
#endif

#include "dmx.h"
#include "dmxsync.h"
#include "dmxscrinit.h"
#include "dmxcursor.h"
#include "dmxgc.h"
#include "dmxgcops.h"
#include "dmxwindow.h"
#include "dmxpixmap.h"
#include "dmxfont.h"
#include "dmxcmap.h"
#include "dmxprop.h"
#include "dmxdpms.h"

#include "dmxpict.h"

#include "fb.h"
#include "mipointer.h"
#include "micmap.h"

#include <X11/fonts/libxfont2.h>

extern Bool dmxCloseScreen(ScreenPtr pScreen);
static Bool dmxSaveScreen(ScreenPtr pScreen, int what);

static unsigned long dmxGeneration;
static unsigned long *dmxCursorGeneration;

DevPrivateKeyRec dmxGCPrivateKeyRec;
DevPrivateKeyRec dmxWinPrivateKeyRec;
DevPrivateKeyRec dmxPixPrivateKeyRec;
int dmxFontPrivateIndex;        /**< Private index for Fonts     */
DevPrivateKeyRec dmxScreenPrivateKeyRec;
DevPrivateKeyRec dmxColormapPrivateKeyRec;
DevPrivateKeyRec dmxPictPrivateKeyRec;
DevPrivateKeyRec dmxGlyphSetPrivateKeyRec;

#ifdef DPMSExtension
static void
dmxDPMS(ScreenPtr pScreen, int level)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
    dmxDPMSBackend(dmxScreen, level);
}
#else
#define dmxDPMS NULL
#endif

/** Initialize the parts of screen \a idx that require access to the
 *  back-end server. */
void
dmxBEScreenInit(ScreenPtr pScreen)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
    XSetWindowAttributes attribs;
    unsigned long mask;
    int i, j;

    /* FIXME: The dmxScreenInit() code currently assumes that it will
     * not be called if the Xdmx server is started with this screen
     * detached -- i.e., it assumes that dmxScreen->beDisplay is always
     * valid.  This is not necessarily a valid assumption when full
     * addition/removal of screens is implemented, but when this code is
     * broken out for screen reattachment, then we will reevaluate this
     * assumption.
     */

    pScreen->mmWidth = DisplayWidthMM(dmxScreen->beDisplay,
                                      DefaultScreen(dmxScreen->beDisplay));
    pScreen->mmHeight = DisplayHeightMM(dmxScreen->beDisplay,
                                        DefaultScreen(dmxScreen->beDisplay));

    pScreen->whitePixel = dmxScreen->beWhitePixel;
    pScreen->blackPixel = dmxScreen->beBlackPixel;

    /* Handle screen savers and DPMS on the backend */
    if (dmxDPMSInit(dmxScreen))
        pScreen->DPMS = dmxDPMS;

    /* Create root window for screen */
    mask = CWBackPixel | CWEventMask | CWColormap | CWOverrideRedirect;
    attribs.background_pixel = dmxScreen->beBlackPixel;
    attribs.event_mask = (KeyPressMask
                          | KeyReleaseMask
                          | ButtonPressMask
                          | ButtonReleaseMask
                          | EnterWindowMask
                          | LeaveWindowMask
                          | PointerMotionMask
                          | KeymapStateMask | FocusChangeMask);
    attribs.colormap = dmxScreen->beDefColormaps[dmxScreen->beDefVisualIndex];
    attribs.override_redirect = True;

    dmxScreen->scrnWin =
        XCreateWindow(dmxScreen->beDisplay,
                      DefaultRootWindow(dmxScreen->beDisplay),
                      dmxScreen->scrnX,
                      dmxScreen->scrnY,
                      dmxScreen->scrnWidth,
                      dmxScreen->scrnHeight,
                      0,
                      pScreen->rootDepth,
                      InputOutput,
                      dmxScreen->beVisuals[dmxScreen->beDefVisualIndex].visual,
                      mask, &attribs);
    dmxPropertyWindow(dmxScreen);

    /*
     * This turns off the cursor by defining a cursor with no visible
     * components.
     */
    {
        char noCursorData[] = { 0, 0, 0, 0,
            0, 0, 0, 0
        };
        Pixmap pixmap;
        XColor color, tmp;

        pixmap = XCreateBitmapFromData(dmxScreen->beDisplay, dmxScreen->scrnWin,
                                       noCursorData, 8, 8);
        XAllocNamedColor(dmxScreen->beDisplay, dmxScreen->beDefColormaps[0],
                         "black", &color, &tmp);
        dmxScreen->noCursor = XCreatePixmapCursor(dmxScreen->beDisplay,
                                                  pixmap, pixmap,
                                                  &color, &color, 0, 0);
        XDefineCursor(dmxScreen->beDisplay, dmxScreen->scrnWin,
                      dmxScreen->noCursor);

        XFreePixmap(dmxScreen->beDisplay, pixmap);
    }

    XMapWindow(dmxScreen->beDisplay, dmxScreen->scrnWin);

    /* Create default drawables (used during GC creation) */
    for (i = 0; i < dmxScreen->beNumPixmapFormats; i++)
	for (j = 0; j < dmxScreen->beNumDepths; j++)
	    if ((dmxScreen->bePixmapFormats[i].depth == 1) ||
		(dmxScreen->bePixmapFormats[i].depth ==
		 dmxScreen->beDepths[j])) {
		dmxScreen->scrnDefDrawables[i] = (Drawable)
		    XCreatePixmap(dmxScreen->beDisplay, dmxScreen->scrnWin,
				  1, 1,
				  dmxScreen->bePixmapFormats[i].depth);
		break;
	    }
}

/** Initialize screen number \a pScreen->myNum. */
Bool
dmxScreenInit(ScreenPtr pScreen, int argc, char *argv[])
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
    int i, j;

    if (!dixRegisterPrivateKey(&dmxScreenPrivateKeyRec, PRIVATE_SCREEN, 0))
        return FALSE;
    if (!dixRegisterPrivateKey(&dmxColormapPrivateKeyRec, PRIVATE_COLORMAP, 0))
        return FALSE;
    if (!dixRegisterPrivateKey(&dmxGlyphSetPrivateKeyRec, PRIVATE_GLYPHSET, 0))
        return FALSE;

    if (dmxGeneration != serverGeneration) {
        /* Allocate font private index */
        dmxFontPrivateIndex = xfont2_allocate_font_private_index();
        if (dmxFontPrivateIndex == -1)
            return FALSE;

        dmxGeneration = serverGeneration;
    }

    if (!dmxInitGC(pScreen))
	return FALSE;
    if (!dmxInitWindow(pScreen))
	return FALSE;
    if (!dmxInitPixmap(pScreen))
	return FALSE;

    /*
     * Initalise the visual types.  miSetVisualTypesAndMasks() requires
     * that all of the types for each depth be collected together.  It's
     * intended for slightly different usage to what we would like here.
     * Maybe a miAddVisualTypeAndMask() function will be added to make
     * things easier here.
     */
    for (i = 0; i < dmxScreen->beNumDepths; i++) {
        int depth;
        int visuals = 0;
        int bitsPerRgb = 0;
        int preferredClass = -1;
        Pixel redMask = 0;
        Pixel greenMask = 0;
        Pixel blueMask = 0;

        depth = dmxScreen->beDepths[i];
        for (j = 0; j < dmxScreen->beNumVisuals; j++) {
            XVisualInfo *vi;

            vi = &dmxScreen->beVisuals[j];
            if (vi->depth == depth) {
                /* Assume the masks are all the same. */
                visuals |= (1 << vi->class);
                bitsPerRgb = vi->bits_per_rgb;
                redMask = vi->red_mask;
                greenMask = vi->green_mask;
                blueMask = vi->blue_mask;
                if (j == dmxScreen->beDefVisualIndex) {
                    preferredClass = vi->class;
                }
            }
        }
        miSetVisualTypesAndMasks(depth, visuals, bitsPerRgb, preferredClass,
                                 redMask, greenMask, blueMask);
    }

    fbScreenInit(pScreen,
                 NULL,
                 dmxScreen->scrnWidth,
                 dmxScreen->scrnHeight,
                 dmxScreen->beXDPI,
                 dmxScreen->beXDPI, dmxScreen->scrnWidth, dmxScreen->beBPP);
    (void) dmxPictureInit(pScreen, 0, 0);

    /* Not yet... */
    pScreen->GetWindowPixmap = NULL;
    pScreen->SetWindowPixmap = NULL;

    MAXSCREENSALLOC(dmxCursorGeneration);
    if (dmxCursorGeneration[pScreen->myNum] != serverGeneration) {
	if (!(miPointerInitialize(pScreen,
				  &dmxPointerSpriteFuncs,
				  &dmxPointerCursorFuncs, FALSE)))
	    return FALSE;

	dmxCursorGeneration[pScreen->myNum] = serverGeneration;
    }

    DMX_WRAP(CloseScreen, dmxCloseScreen, dmxScreen, pScreen);
    DMX_WRAP(SaveScreen, dmxSaveScreen, dmxScreen, pScreen);

    dmxBEScreenInit(pScreen);

    /* Wrap GC functions */
    DMX_WRAP(CreateGC, dmxCreateGC, dmxScreen, pScreen);

    /* Wrap Window functions */
    DMX_WRAP(CreateWindow, dmxCreateWindow, dmxScreen, pScreen);
    DMX_WRAP(DestroyWindow, dmxDestroyWindow, dmxScreen, pScreen);
    DMX_WRAP(PositionWindow, dmxPositionWindow, dmxScreen, pScreen);
    DMX_WRAP(ChangeWindowAttributes, dmxChangeWindowAttributes, dmxScreen,
	     pScreen);
    DMX_WRAP(RealizeWindow, dmxRealizeWindow, dmxScreen, pScreen);
    DMX_WRAP(UnrealizeWindow, dmxUnrealizeWindow, dmxScreen, pScreen);
    DMX_WRAP(RestackWindow, dmxRestackWindow, dmxScreen, pScreen);
    DMX_WRAP(WindowExposures, dmxWindowExposures, dmxScreen, pScreen);
    DMX_WRAP(CopyWindow, dmxCopyWindow, dmxScreen, pScreen);

    DMX_WRAP(ResizeWindow, dmxResizeWindow, dmxScreen, pScreen);
    DMX_WRAP(ReparentWindow, dmxReparentWindow, dmxScreen, pScreen);

    DMX_WRAP(ChangeBorderWidth, dmxChangeBorderWidth, dmxScreen, pScreen);

    /* Wrap Image functions */
    DMX_WRAP(GetImage, dmxGetImage, dmxScreen, pScreen);
    DMX_WRAP(GetSpans, dmxGetSpans, dmxScreen, pScreen);

    /* Wrap Pixmap functions */
    DMX_WRAP(CreatePixmap, dmxCreatePixmap, dmxScreen, pScreen);
    DMX_WRAP(DestroyPixmap, dmxDestroyPixmap, dmxScreen, pScreen);
    DMX_WRAP(BitmapToRegion, dmxBitmapToRegion, dmxScreen, pScreen);

    /* Wrap Font functions */
    DMX_WRAP(RealizeFont, dmxRealizeFont, dmxScreen, pScreen);
    DMX_WRAP(UnrealizeFont, dmxUnrealizeFont, dmxScreen, pScreen);

    /* Wrap Colormap functions */
    DMX_WRAP(CreateColormap, dmxCreateColormap, dmxScreen, pScreen);
    DMX_WRAP(DestroyColormap, dmxDestroyColormap, dmxScreen, pScreen);
    DMX_WRAP(InstallColormap, dmxInstallColormap, dmxScreen, pScreen);
    DMX_WRAP(StoreColors, dmxStoreColors, dmxScreen, pScreen);

    /* Wrap Shape functions */
    DMX_WRAP(SetShape, dmxSetShape, dmxScreen, pScreen);

    if (!dmxCreateDefColormap(pScreen))
        return FALSE;

    return TRUE;
}

/** Close the \a pScreen resources on the back-end server. */
void
dmxBECloseScreen(ScreenPtr pScreen)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
    int i;

    /* Restore the back-end screen-saver and DPMS state. */
    dmxDPMSTerm(dmxScreen);

    /* Free the screen resources */

    XFreeCursor(dmxScreen->beDisplay, dmxScreen->noCursor);
    dmxScreen->noCursor = (Cursor) 0;

    XUnmapWindow(dmxScreen->beDisplay, dmxScreen->scrnWin);
    XDestroyWindow(dmxScreen->beDisplay, dmxScreen->scrnWin);
    dmxScreen->scrnWin = (Window) 0;

    /* Free the default drawables */
    for (i = 0; i < dmxScreen->beNumPixmapFormats; i++) {
	if (dmxScreen->scrnDefDrawables[i]) {
	    XFreePixmap(dmxScreen->beDisplay,
			dmxScreen->scrnDefDrawables[i]);
	    dmxScreen->scrnDefDrawables[i] = (Drawable) 0;
	}
    }

    /* Free resources allocated during initialization (in dmxinit.c) */
    for (i = 0; i < dmxScreen->beNumDefColormaps; i++)
        XFreeColormap(dmxScreen->beDisplay, dmxScreen->beDefColormaps[i]);
    free(dmxScreen->beDefColormaps);
    dmxScreen->beDefColormaps = NULL;

#if 0
    /* Do not free visuals, depths and pixmap formats here.  Free them
     * in dmxCloseScreen() instead -- see comment below. */
    XFree(dmxScreen->beVisuals);
    dmxScreen->beVisuals = NULL;

    XFree(dmxScreen->beDepths);
    dmxScreen->beDepths = NULL;

    XFree(dmxScreen->bePixmapFormats);
    dmxScreen->bePixmapFormats = NULL;
#endif

#ifdef GLXEXT
    if (dmxScreen->glxVisuals) {
        XFree(dmxScreen->glxVisuals);
        dmxScreen->glxVisuals = NULL;
        dmxScreen->numGlxVisuals = 0;
    }
#endif

    /* Close display */
    XCloseDisplay(dmxScreen->beDisplay);
    dmxScreen->beDisplay = NULL;
}

/** Close screen number \a idx. */
Bool
dmxCloseScreen(ScreenPtr pScreen)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

    /* Reset the proc vectors */
    if (pScreen->myNum == 0) {
        dmxResetRender();
        dmxResetFonts();
    }

    /* Unwrap Shape functions */
    DMX_UNWRAP(SetShape, dmxScreen, pScreen);

    /* Unwrap the pScreen functions */
    DMX_UNWRAP(CreateGC, dmxScreen, pScreen);

    DMX_UNWRAP(CreateWindow, dmxScreen, pScreen);
    DMX_UNWRAP(DestroyWindow, dmxScreen, pScreen);
    DMX_UNWRAP(PositionWindow, dmxScreen, pScreen);
    DMX_UNWRAP(ChangeWindowAttributes, dmxScreen, pScreen);
    DMX_UNWRAP(RealizeWindow, dmxScreen, pScreen);
    DMX_UNWRAP(UnrealizeWindow, dmxScreen, pScreen);
    DMX_UNWRAP(RestackWindow, dmxScreen, pScreen);
    DMX_UNWRAP(WindowExposures, dmxScreen, pScreen);
    DMX_UNWRAP(CopyWindow, dmxScreen, pScreen);

    DMX_UNWRAP(ResizeWindow, dmxScreen, pScreen);
    DMX_UNWRAP(ReparentWindow, dmxScreen, pScreen);

    DMX_UNWRAP(ChangeBorderWidth, dmxScreen, pScreen);

    DMX_UNWRAP(GetImage, dmxScreen, pScreen);
    DMX_UNWRAP(GetSpans, dmxScreen, pScreen);

    DMX_UNWRAP(CreatePixmap, dmxScreen, pScreen);
    DMX_UNWRAP(DestroyPixmap, dmxScreen, pScreen);
    DMX_UNWRAP(BitmapToRegion, dmxScreen, pScreen);

    DMX_UNWRAP(RealizeFont, dmxScreen, pScreen);
    DMX_UNWRAP(UnrealizeFont, dmxScreen, pScreen);

    DMX_UNWRAP(CreateColormap, dmxScreen, pScreen);
    DMX_UNWRAP(DestroyColormap, dmxScreen, pScreen);
    DMX_UNWRAP(InstallColormap, dmxScreen, pScreen);
    DMX_UNWRAP(StoreColors, dmxScreen, pScreen);

    DMX_UNWRAP(SaveScreen, dmxScreen, pScreen);

    if (dmxScreen->beDisplay) {
        dmxBECloseScreen(pScreen);

#if 1
        /* Free visuals, depths and pixmap formats here so that they
         * won't be freed when a screen is detached, thereby allowing
         * the screen to be reattached to be compared to the one
         * previously removed.
         */
        XFree(dmxScreen->beVisuals);
        dmxScreen->beVisuals = NULL;

        XFree(dmxScreen->beDepths);
        dmxScreen->beDepths = NULL;

        XFree(dmxScreen->bePixmapFormats);
        dmxScreen->bePixmapFormats = NULL;
#endif
    }

    DMX_UNWRAP(CloseScreen, dmxScreen, pScreen);
    return pScreen->CloseScreen(pScreen);
}

static Bool
dmxSaveScreen(ScreenPtr pScreen, int what)
{
    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

    if (dmxScreen->beDisplay) {
        switch (what) {
        case SCREEN_SAVER_OFF:
        case SCREEN_SAVER_FORCER:
            XResetScreenSaver(dmxScreen->beDisplay);
            dmxSync(dmxScreen, FALSE);
            break;
        case SCREEN_SAVER_ON:
        case SCREEN_SAVER_CYCLE:
            XActivateScreenSaver(dmxScreen->beDisplay);
            dmxSync(dmxScreen, FALSE);
            break;
        }
    }

    return TRUE;
}
