/* $XFree86: xc/programs/Xserver/hw/xfree86/vga256/vgainit/vgabppscrin.c,v 3.1 1994/09/24 15:15:36 dawes Exp $ */
/************************************************************
Copyright 1987 by Sun Microsystems, Inc. Mountain View, CA.

                    All Rights Reserved

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SUN DISCLAIMS ALL WARRANTIES WITH REGARD TO  THIS  SOFTWARE,
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/*
 * This is the cfb16/32 ScreenInit function, modified for the XFree86
 * 8/16/32bpp SVGA server. The problem is that there doesn't seem to be
 * a safe way to convince the standard init routines to use the
 * reversed RGB order (blue is at lowest bit number) that is a
 * tradition in PC/VGA devices.
 *
 * This file is compiled twice, with PSZ == 16 and with PSZ == 32.
 *
 * The callable functions are vga16bppScreenInit and vga32bppScreenInit.
 *
 */


#include "X.h"
#include "Xmd.h"
#include "servermd.h"
#include "scrnintstr.h"
#include "pixmapstr.h"
#include "resource.h"
#include "colormap.h"
#include "colormapst.h"
#include "cfb.h"
#include "mi.h"
#include "mistruct.h"
#include "dix.h"
#include "cfbmskbits.h"
#include "mibstore.h"

#include "gcstruct.h"
#include "xf86.h"
#include "xf86Priv.h"	/* for xf86weight */
#include "vga.h"

#if PSZ == 16
#define vgabppScreenInit vga16bppScreenInit
#endif
#if PSZ == 32
#define vgabppScreenInit vga32bppScreenInit
#endif


/* This is defined in cfbscrinit.c */
extern Bool cfbCreateScreenResources();

/* We need to define this here instead of use the cfb one. */
static miBSFuncRec vgaBSFuncRec = {
    cfbSaveAreas,
    cfbRestoreAreas,
    (void (*)()) 0,
    (PixmapPtr (*)()) 0,
    (PixmapPtr (*)()) 0,
};


static vgaFinishScreenInit(pScreen, pbits, xsize, ysize, dpix, dpiy, width)
    register ScreenPtr pScreen;
    pointer pbits;		/* pointer to screen bitmap */
    int xsize, ysize;		/* in pixels */
    int dpix, dpiy;		/* dots per inch */
    int width;			/* pixel width of frame buffer */
{
    int	i, j;
#ifdef CFB_NEED_SCREEN_PRIVATE
    pointer oldDevPrivate;
#endif
    VisualPtr	visuals;
    DepthPtr	depths;
    int		nvisuals;
    int		ndepths;
    int		rootdepth;
    VisualID	defaultVisual;
    VisualPtr   visual;
    int		BitsPerRGB;

    rootdepth = 0;
    BitsPerRGB = xf86weight.green;
#if PSZ > 8
    /* Only TrueColor for 16/32bpp */
    if (!cfbSetVisualTypes(vga256InfoRec.depth, 1 << TrueColor, BitsPerRGB))
	return FALSE;
#endif
    if (!cfbInitVisuals (&visuals, &depths, &nvisuals, &ndepths, &rootdepth,
			 &defaultVisual,((unsigned long)1<<(PSZ-1)), BitsPerRGB))
	return FALSE;

    /*
     * Now correct the RGB order of direct/truecolor visuals for the
     * 16/32bpp SVGA server.
     */
    for (i = 0, visual = visuals; i < nvisuals; i++, visual++)
	if (visual->class == DirectColor || visual->class == TrueColor) {
	    visual->offsetRed = xf86weight.green + xf86weight.blue;
	    visual->offsetGreen = xf86weight.blue;
	    visual->offsetBlue = 0;
	    visual->redMask = ((1 << xf86weight.red) - 1)
		<< visual->offsetRed;
	    visual->greenMask = ((1 << xf86weight.green) - 1)
		<< visual->offsetGreen;
	    visual->blueMask = (1 << xf86weight.blue) - 1;
	}

    pScreen->defColormap = FakeClientID(0);

#ifdef CFB_NEED_SCREEN_PRIVATE
    oldDevPrivate = pScreen->devPrivate;
#endif
    if (! miScreenInit(pScreen, pbits, xsize, ysize, dpix, dpiy, width,
			rootdepth, ndepths, depths,
			defaultVisual, nvisuals, visuals,
			(miBSFuncPtr) 0))
	return FALSE;
    /* overwrite miCloseScreen with our own */
    pScreen->CloseScreen = cfbCloseScreen;
    /* init backing store here so we can overwrite CloseScreen without stepping
     * on the backing store wrapped version */
    miInitializeBackingStore (pScreen, &vgaBSFuncRec);
#ifdef CFB_NEED_SCREEN_PRIVATE
    pScreen->CreateScreenResources = cfbCreateScreenResources;
    pScreen->devPrivates[cfbScreenPrivateIndex].ptr = pScreen->devPrivate;
    pScreen->devPrivate = oldDevPrivate;
#endif
    return TRUE;
}

/* dts * (inch/dot) * (25.4 mm / inch) = mm */
Bool
vgabppScreenInit(pScreen, pbits, xsize, ysize, dpix, dpiy, width)
    register ScreenPtr pScreen;
    pointer pbits;		/* pointer to screen bitmap */
    int xsize, ysize;		/* in pixels */
    int dpix, dpiy;		/* dots per inch */
    int width;			/* pixel width of frame buffer */
{
    if (!cfbSetupScreen(pScreen, pbits, xsize, ysize, dpix, dpiy, width))
	return FALSE;
    if (!vgaFinishScreenInit(pScreen, pbits, xsize, ysize, dpix, dpiy, width))
        return FALSE;
}