windows-xp/Source/XPSP1/NT/drivers/video/ms/8514a/disp/enable.c

/******************************Module*Header*******************************\
* Module Name: enable.c
*
* This module contains the functions that enable and disable the
* driver, the pdev, and the surface.
*
* Copyright (c) 1992-1994 Microsoft Corporation
\**************************************************************************/

#include "precomp.h"

/******************************Public*Structure****************************\
* GDIINFO ggdiDefault
*
* This contains the default GDIINFO fields that are passed back to GDI
* during DrvEnablePDEV.
*
* NOTE: This structure defaults to values for an 8bpp palette device.
*       Some fields are overwritten for different colour depths.
\**************************************************************************/

GDIINFO ggdiDefault = {
    GDI_DRIVER_VERSION,
    DT_RASDISPLAY,          // ulTechnology
    0,                      // ulHorzSize (filled in later)
    0,                      // ulVertSize (filled in later)
    0,                      // ulHorzRes (filled in later)
    0,                      // ulVertRes (filled in later)
    0,                      // cBitsPixel (filled in later)
    0,                      // cPlanes (filled in later)
    20,                     // ulNumColors (palette managed)
    0,                      // flRaster (DDI reserved field)

    0,                      // ulLogPixelsX (filled in later)
    0,                      // ulLogPixelsY (filled in later)

    TC_RA_ABLE,             // flTextCaps -- If we had wanted console windows
                            //   to scroll by repainting the entire window,
                            //   instead of doing a screen-to-screen blt, we
                            //   would have set TC_SCROLLBLT (yes, the flag is
                            //   bass-ackwards).

    0,                      // ulDACRed (filled in later)
    0,                      // ulDACGreen (filled in later)
    0,                      // ulDACBlue (filled in later)

    0x0024,                 // ulAspectX
    0x0024,                 // ulAspectY
    0x0033,                 // ulAspectXY (one-to-one aspect ratio)

    1,                      // xStyleStep
    1,                      // yStyleSte;
    3,                      // denStyleStep -- Styles have a one-to-one aspect
                            //   ratio, and every 'dot' is 3 pixels long

    { 0, 0 },               // ptlPhysOffset
    { 0, 0 },               // szlPhysSize

    256,                    // ulNumPalReg

    // These fields are for halftone initialization.  The actual values are
    // a bit magic, but seem to work well on our display.

    {                       // ciDevice
       { 6700, 3300, 0 },   //      Red
       { 2100, 7100, 0 },   //      Green
       { 1400,  800, 0 },   //      Blue
       { 1750, 3950, 0 },   //      Cyan
       { 4050, 2050, 0 },   //      Magenta
       { 4400, 5200, 0 },   //      Yellow
       { 3127, 3290, 0 },   //      AlignmentWhite
       20000,               //      RedGamma
       20000,               //      GreenGamma
       20000,               //      BlueGamma
       0, 0, 0, 0, 0, 0     //      No dye correction for raster displays
    },

    0,                       // ulDevicePelsDPI (for printers only)
    PRIMARY_ORDER_CBA,       // ulPrimaryOrder
    HT_PATSIZE_4x4_M,        // ulHTPatternSize
    HT_FORMAT_8BPP,          // ulHTOutputFormat
    HT_FLAG_ADDITIVE_PRIMS,  // flHTFlags
    0,                       // ulVRefresh (filled in later)
    0,                       // ulBltAlignment
    0,                       // ulPanningHorzRes (filled in later)
    0,                       // ulPanningVertRes (filled in later)
};

/******************************Public*Structure****************************\
* DEVINFO gdevinfoDefault
*
* This contains the default DEVINFO fields that are passed back to GDI
* during DrvEnablePDEV.
*
* NOTE: This structure defaults to values for an 8bpp palette device.
*       Some fields are overwritten for different colour depths.
\**************************************************************************/

#define SYSTM_LOGFONT {16,7,0,0,700,0,0,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,\
                       CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,\
                       VARIABLE_PITCH | FF_DONTCARE,L"System"}
#define HELVE_LOGFONT {12,9,0,0,400,0,0,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,\
                       CLIP_STROKE_PRECIS,PROOF_QUALITY,\
                       VARIABLE_PITCH | FF_DONTCARE,L"MS Sans Serif"}
#define COURI_LOGFONT {12,9,0,0,400,0,0,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,\
                       CLIP_STROKE_PRECIS,PROOF_QUALITY,\
                       FIXED_PITCH | FF_DONTCARE, L"Courier"}

DEVINFO gdevinfoDefault = {
    (GCAPS_OPAQUERECT       |
     GCAPS_DITHERONREALIZE  |
     GCAPS_PALMANAGED       |
     GCAPS_ALTERNATEFILL    |
     GCAPS_WINDINGFILL      |
     GCAPS_MONO_DITHER      |
     GCAPS_COLOR_DITHER),
                                                // flGraphicsFlags
    SYSTM_LOGFONT,                              // lfDefaultFont
    HELVE_LOGFONT,                              // lfAnsiVarFont
    COURI_LOGFONT,                              // lfAnsiFixFont
    0,                                          // cFonts
    BMF_8BPP,                                   // iDitherFormat
    8,                                          // cxDither
    8,                                          // cyDither
    0                                           // hpalDefault (filled in later)
};

/******************************Public*Structure****************************\
* DFVFN gadrvfn[]
*
* Build the driver function table gadrvfn with function index/address
* pairs.  This table tells GDI which DDI calls we support, and their
* location (GDI does an indirect call through this table to call us).
*
* Why haven't we implemented DrvSaveScreenBits?  To save code.
*
* When the driver doesn't hook DrvSaveScreenBits, USER simulates on-
* the-fly by creating a temporary device-format-bitmap, and explicitly
* calling DrvCopyBits to save/restore the bits.  Since we already hook
* DrvCreateDeviceBitmap, we'll end up using off-screen memory to store
* the bits anyway (which would have been the main reason for implementing
* DrvSaveScreenBits).  So we may as well save some working set.
\**************************************************************************/

#if DBG || !SYNCHRONIZEACCESS_WORKS

// On Checked builds, or when we have to synchronize access, thunk
// everything through Dbg calls...

DRVFN gadrvfn[] = {
    {   INDEX_DrvEnablePDEV,            (PFN) DbgEnablePDEV         },
    {   INDEX_DrvCompletePDEV,          (PFN) DbgCompletePDEV       },
    {   INDEX_DrvDisablePDEV,           (PFN) DbgDisablePDEV        },
    {   INDEX_DrvEnableSurface,         (PFN) DbgEnableSurface      },
    {   INDEX_DrvDisableSurface,        (PFN) DbgDisableSurface     },
    {   INDEX_DrvAssertMode,            (PFN) DbgAssertMode         },
    {   INDEX_DrvMovePointer,           (PFN) DbgMovePointer        },
    {   INDEX_DrvSetPointerShape,       (PFN) DbgSetPointerShape    },
    {   INDEX_DrvDitherColor,           (PFN) DbgDitherColor        },
    {   INDEX_DrvSetPalette,            (PFN) DbgSetPalette         },
    {   INDEX_DrvCopyBits,              (PFN) DbgCopyBits           },
    {   INDEX_DrvBitBlt,                (PFN) DbgBitBlt             },
    {   INDEX_DrvTextOut,               (PFN) DbgTextOut            },
    {   INDEX_DrvGetModes,              (PFN) DbgGetModes           },
    {   INDEX_DrvStrokePath,            (PFN) DbgStrokePath         },
    {   INDEX_DrvFillPath,              (PFN) DbgFillPath           },
    {   INDEX_DrvPaint,                 (PFN) DbgPaint              },
    {   INDEX_DrvRealizeBrush,          (PFN) DbgRealizeBrush       },
    {   INDEX_DrvCreateDeviceBitmap,    (PFN) DbgCreateDeviceBitmap },
    {   INDEX_DrvDeleteDeviceBitmap,    (PFN) DbgDeleteDeviceBitmap },
    {   INDEX_DrvStretchBlt,            (PFN) DbgStretchBlt         },
};

#else

// On Free builds, directly call the appropriate functions...

DRVFN gadrvfn[] = {
    {   INDEX_DrvEnablePDEV,            (PFN) DrvEnablePDEV         },
    {   INDEX_DrvCompletePDEV,          (PFN) DrvCompletePDEV       },
    {   INDEX_DrvDisablePDEV,           (PFN) DrvDisablePDEV        },
    {   INDEX_DrvEnableSurface,         (PFN) DrvEnableSurface      },
    {   INDEX_DrvDisableSurface,        (PFN) DrvDisableSurface     },
    {   INDEX_DrvAssertMode,            (PFN) DrvAssertMode         },
    {   INDEX_DrvMovePointer,           (PFN) DrvMovePointer        },
    {   INDEX_DrvSetPointerShape,       (PFN) DrvSetPointerShape    },
    {   INDEX_DrvDitherColor,           (PFN) DrvDitherColor        },
    {   INDEX_DrvSetPalette,            (PFN) DrvSetPalette         },
    {   INDEX_DrvCopyBits,              (PFN) DrvCopyBits           },
    {   INDEX_DrvBitBlt,                (PFN) DrvBitBlt             },
    {   INDEX_DrvTextOut,               (PFN) DrvTextOut            },
    {   INDEX_DrvGetModes,              (PFN) DrvGetModes           },
    {   INDEX_DrvStrokePath,            (PFN) DrvStrokePath         },
    {   INDEX_DrvFillPath,              (PFN) DrvFillPath           },
    {   INDEX_DrvPaint,                 (PFN) DrvPaint              },
    {   INDEX_DrvRealizeBrush,          (PFN) DrvRealizeBrush       },
    {   INDEX_DrvCreateDeviceBitmap,    (PFN) DrvCreateDeviceBitmap },
    {   INDEX_DrvDeleteDeviceBitmap,    (PFN) DrvDeleteDeviceBitmap },
    {   INDEX_DrvStretchBlt,            (PFN) DrvStretchBlt         },
};

#endif

ULONG gcdrvfn = sizeof(gadrvfn) / sizeof(DRVFN);

/******************************Public*Routine******************************\
* BOOL DrvEnableDriver
*
* Enables the driver by retrieving the drivers function table and version.
*
\**************************************************************************/

BOOL DrvEnableDriver(
ULONG          iEngineVersion,
ULONG          cj,
DRVENABLEDATA* pded)
{
    // Engine Version is passed down so future drivers can support previous
    // engine versions.  A next generation driver can support both the old
    // and new engine conventions if told what version of engine it is
    // working with.  For the first version the driver does nothing with it.

    // Fill in as much as we can.

    if (cj >= sizeof(DRVENABLEDATA))
        pded->pdrvfn = gadrvfn;

    if (cj >= (sizeof(ULONG) * 2))
        pded->c = gcdrvfn;

    // DDI version this driver was targeted for is passed back to engine.
    // Future graphic's engine may break calls down to old driver format.

    if (cj >= sizeof(ULONG))
        pded->iDriverVersion = DDI_DRIVER_VERSION_NT4;

    return(TRUE);
}

/******************************Public*Routine******************************\
* VOID DrvDisableDriver
*
* Tells the driver it is being disabled.  Release any resources allocated in
* DrvEnableDriver.
*
\**************************************************************************/

VOID DrvDisableDriver(VOID)
{
    return;
}

/******************************Public*Routine******************************\
* DHPDEV DrvEnablePDEV
*
* Initializes a bunch of fields for GDI, based on the mode we've been asked
* to do.  This is the first thing called after DrvEnableDriver, when GDI
* wants to get some information about us.
*
\**************************************************************************/

DHPDEV DrvEnablePDEV(
DEVMODEW*   pdm,            // Contains data pertaining to requested mode
PWSTR       pwszLogAddr,    // Logical address
ULONG       cPat,           // Count of standard patterns
HSURF*      phsurfPatterns, // Buffer for standard patterns
ULONG       cjCaps,         // Size of buffer for device caps 'pdevcaps'
ULONG*      pdevcaps,       // Buffer for device caps, also known as 'gdiinfo'
ULONG       cjDevInfo,      // Number of bytes in device info 'pdi'
DEVINFO*    pdi,            // Device information
HDEV        hdev,           // HDEV, used for callbacks
PWSTR       pwszDeviceName, // Device name
HANDLE      hDriver)        // Kernel driver handle
{
    PDEV*   ppdev;

    // Future versions of NT had better supply 'devcaps' and 'devinfo'
    // structures that are the same size or larger than the current
    // structures:

    if ((cjCaps < sizeof(GDIINFO)) || (cjDevInfo < sizeof(DEVINFO)))
    {
        DISPDBG((0, "DrvEnablePDEV - Buffer size too small"));
        goto ReturnFailure0;
    }

    // Allocate a physical device structure.  Note that we definitely
    // rely on the zero initialization:

    ppdev = (PDEV*) EngAllocMem(FL_ZERO_MEMORY, sizeof(PDEV), ALLOC_TAG);
    if (ppdev == NULL)
    {
        DISPDBG((0, "DrvEnablePDEV - Failed EngAllocMem"));
        goto ReturnFailure0;
    }

    ppdev->hDriver = hDriver;

    // Get the current screen mode information.  Set up device caps and
    // devinfo:

    if (!bInitializeModeFields(ppdev, (GDIINFO*) pdevcaps, pdi, pdm))
    {
        DISPDBG((0, "DrvEnablePDEV - Failed bInitializeModeFields"));
        goto ReturnFailure1;
    }

    // Initialize palette information.

    if (!bInitializePalette(ppdev, pdi))
    {
        DISPDBG((0, "DrvEnablePDEV - Failed bInitializePalette"));
        goto ReturnFailure1;
    }

    return((DHPDEV) ppdev);

ReturnFailure1:
    DrvDisablePDEV((DHPDEV) ppdev);

ReturnFailure0:
    DISPDBG((0, "Failed DrvEnablePDEV"));

    return(0);
}

/******************************Public*Routine******************************\
* DrvDisablePDEV
*
* Release the resources allocated in DrvEnablePDEV.  If a surface has been
* enabled DrvDisableSurface will have already been called.
*
* Note: In an error, we may call this before DrvEnablePDEV is done.
*
\**************************************************************************/

VOID DrvDisablePDEV(
DHPDEV  dhpdev)
{
    PDEV*   ppdev;

    ppdev = (PDEV*) dhpdev;

    vUninitializePalette(ppdev);
    EngFreeMem(ppdev);
}

/******************************Public*Routine******************************\
* VOID DrvCompletePDEV
*
* Store the HPDEV, the engines handle for this PDEV, in the DHPDEV.
*
\**************************************************************************/

VOID DrvCompletePDEV(
DHPDEV dhpdev,
HDEV   hdev)
{
    ((PDEV*) dhpdev)->hdevEng = hdev;
}

/******************************Public*Routine******************************\
* HSURF DrvEnableSurface
*
* Creates the drawing surface and initializes the hardware.  This is called
* after DrvEnablePDEV, and performs the final device initialization.
*
\**************************************************************************/

HSURF DrvEnableSurface(
DHPDEV dhpdev)
{
    PDEV*   ppdev;
    HSURF   hsurf;
    SIZEL   sizl;
    DSURF*  pdsurf;
    VOID*   pvTmpBuffer;

    ppdev = (PDEV*) dhpdev;

    /////////////////////////////////////////////////////////////////////
    // First, create our private surface structure.
    //
    // Whenever we get a call to draw directly to the screen, we'll get
    // passed a pointer to a SURFOBJ whose 'dhpdev' field will point
    // to our PDEV structure, and whose 'dhsurf' field will point to the
    // following DSURF structure.
    //
    // Every device bitmap we create in DrvCreateDeviceBitmap will also
    // have its own unique DSURF structure allocated (but will share the
    // same PDEV).  To make our code more polymorphic for handling drawing
    // to either the screen or an off-screen bitmap, we have the same
    // structure for both.

    pdsurf = EngAllocMem(FL_ZERO_MEMORY, sizeof(DSURF), ALLOC_TAG);
    if (pdsurf == NULL)
    {
        DISPDBG((0, "DrvEnableSurface - Failed pdsurf EngAllocMem"));
        goto ReturnFailure;
    }

    ppdev->pdsurfScreen = pdsurf;        // Remember it for clean-up

    pdsurf->poh     = &ppdev->heap.ohDfb;// The only thing we use this OH node
    pdsurf->poh->x  = 0;                 //   for is its (x, y) location, and
    pdsurf->poh->y  = 0;                 //   'ohDfb' is otherwise unused
    pdsurf->dt      = DT_SCREEN;         // Not to be confused with a DIB DFB
    pdsurf->sizl.cx = ppdev->cxScreen;
    pdsurf->sizl.cy = ppdev->cyScreen;
    pdsurf->ppdev   = ppdev;

    /////////////////////////////////////////////////////////////////////
    // Next, have GDI create the actual SURFOBJ.
    //
    // Our drawing surface is going to be 'device-managed', meaning that
    // GDI cannot draw on the framebuffer bits directly, and as such we
    // create the surface via EngCreateDeviceSurface.  By doing this, we ensure
    // that GDI will only ever access the bitmaps bits via the Drv calls
    // that we've HOOKed.
    //
    // If we could map the entire framebuffer linearly into main memory
    // (i.e., we didn't have to go through a 64k aperture), it would be
    // beneficial to create the surface via EngCreateBitmap, giving GDI a
    // pointer to the framebuffer bits.  When we pass a call on to GDI
    // where it can't directly read/write to the surface bits because the
    // surface is device managed, it has to create a temporary bitmap and
    // call our DrvCopyBits routine to get/set a copy of the affected bits.
    // Fer example, the OpenGl component prefers to be able to write on the
    // framebuffer bits directly.

    sizl.cx = ppdev->cxScreen;
    sizl.cy = ppdev->cyScreen;

    hsurf = EngCreateDeviceSurface((DHSURF) pdsurf, sizl, ppdev->iBitmapFormat);
    if (hsurf == 0)
    {
        DISPDBG((0, "DrvEnableSurface - Failed EngCreateDeviceSurface"));
        goto ReturnFailure;
    }

    ppdev->hsurfScreen = hsurf;             // Remember it for clean-up
    ppdev->bEnabled = TRUE;                 // We'll soon be in graphics mode

    /////////////////////////////////////////////////////////////////////
    // Now associate the surface and the PDEV.
    //
    // We have to associate the surface we just created with our physical
    // device so that it works.
    //

    if (!EngAssociateSurface(hsurf, ppdev->hdevEng, ppdev->flHooks))
    {
        DISPDBG((0, "DrvEnableSurface - Failed EngAssociateSurface"));
        goto ReturnFailure;
    }

    // Create our generic temporary buffer, which may be used by any
    // component.  Because this may get swapped out of memory any time
    // the driver is not active, we want to minimize the number of pages
    // it takes up.  We use 'VirtualAlloc' to get an exactly page-aligned
    // allocation (which 'EngAllocMem' will not do):

    pvTmpBuffer = EngAllocMem(0, TMP_BUFFER_SIZE, ALLOC_TAG);
    if (pvTmpBuffer == NULL)
    {
        DISPDBG((0, "DrvEnableSurface - Failed EngAllocMem"));
        goto ReturnFailure;
    }

    ppdev->pvTmpBuffer = pvTmpBuffer;

    /////////////////////////////////////////////////////////////////////
    // Now enable all the subcomponents.
    //
    // Note that the order in which these 'Enable' functions are called
    // may be significant in low off-screen memory conditions, because
    // the off-screen heap manager may fail some of the later
    // allocations...

    // NOTE: It isn't until bEnableHardware that cyMemory is correctly set.

    if (!bEnableHardware(ppdev))
        goto ReturnFailure;

    if (!bEnableOffscreenHeap(ppdev))
        goto ReturnFailure;

    if (!bEnablePointer(ppdev))
        goto ReturnFailure;

    if (!bEnableText(ppdev))
        goto ReturnFailure;

    if (!bEnableBrushCache(ppdev))
        goto ReturnFailure;

    if (!bEnablePalette(ppdev))
        goto ReturnFailure;

    DISPDBG((5, "Passed DrvEnableSurface"));

    return(hsurf);

ReturnFailure:
    DrvDisableSurface((DHPDEV) ppdev);

    DISPDBG((0, "Failed DrvEnableSurface"));

    return(0);
}

/******************************Public*Routine******************************\
* VOID DrvDisableSurface
*
* Free resources allocated by DrvEnableSurface.  Release the surface.
*
* Note: In an error case, we may call this before DrvEnableSurface is
*       completely done.
*
\**************************************************************************/

VOID DrvDisableSurface(
DHPDEV dhpdev)
{
    PDEV*   ppdev;

    ppdev = (PDEV*) dhpdev;

    // Note: In an error case, some of the following relies on the
    //       fact that the PDEV is zero-initialized, so fields like
    //       'hsurfScreen' will be zero unless the surface has been
    //       sucessfully initialized, and makes the assumption that
    //       EngDeleteSurface can take '0' as a parameter.

    vDisablePalette(ppdev);
    vDisableBrushCache(ppdev);
    vDisableText(ppdev);
    vDisablePointer(ppdev);
    vDisableOffscreenHeap(ppdev);
    vDisableHardware(ppdev);

    EngFreeMem(ppdev->pvTmpBuffer);
    EngDeleteSurface(ppdev->hsurfScreen);
    EngFreeMem(ppdev->pdsurfScreen);
}

/******************************Public*Routine******************************\
* VOID DrvAssertMode
*
* This asks the device to reset itself to the mode of the pdev passed in.
*
\**************************************************************************/

BOOL DrvAssertMode(
DHPDEV  dhpdev,
BOOL    bEnable)
{
    PDEV* ppdev;

    ppdev = (PDEV*) dhpdev;

    if (!bEnable)
    {
        //////////////////////////////////////////////////////////////
        // Disable - Switch to full-screen mode

        vAssertModePalette(ppdev, FALSE);

        vAssertModeBrushCache(ppdev, FALSE);

        vAssertModeText(ppdev, FALSE);

        vAssertModePointer(ppdev, FALSE);

        if (bAssertModeOffscreenHeap(ppdev, FALSE))
        {
            if (bAssertModeHardware(ppdev, FALSE))
            {
                ppdev->bEnabled = FALSE;

                return(TRUE);
            }

            //////////////////////////////////////////////////////////
            // We failed to switch to full-screen.  So undo everything:

            bAssertModeOffscreenHeap(ppdev, TRUE);  // We don't need to check
        }                                           //   return code with TRUE

        vAssertModePointer(ppdev, TRUE);

        vAssertModeText(ppdev, TRUE);

        vAssertModeBrushCache(ppdev, TRUE);

        vAssertModePalette(ppdev, TRUE);
    }
    else
    {
        //////////////////////////////////////////////////////////////
        // Enable - Switch back to graphics mode

        // We have to enable every subcomponent in the reverse order
        // in which it was disabled:

        if (bAssertModeHardware(ppdev, TRUE))
        {
            bAssertModeOffscreenHeap(ppdev, TRUE);  // We don't need to check
                                                    //   return code with TRUE
            vAssertModePointer(ppdev, TRUE);

            vAssertModeText(ppdev, TRUE);

            vAssertModeBrushCache(ppdev, TRUE);

            vAssertModePalette(ppdev, TRUE);

            ppdev->bEnabled = TRUE;

            return(TRUE);
        }
    }

    return(FALSE);
}

/******************************Public*Routine******************************\
* ULONG DrvGetModes
*
* Returns the list of available modes for the device.
*
\**************************************************************************/

ULONG DrvGetModes(
HANDLE      hDriver,
ULONG       cjSize,
DEVMODEW*   pdm)
{

    DWORD cModes;
    DWORD cbOutputSize;
    PVIDEO_MODE_INFORMATION pVideoModeInformation;
    PVIDEO_MODE_INFORMATION pVideoTemp;
    DWORD cOutputModes = cjSize / (sizeof(DEVMODEW) + DRIVER_EXTRA_SIZE);
    DWORD cbModeSize;

    cModes = getAvailableModes(hDriver,
                            (PVIDEO_MODE_INFORMATION *) &pVideoModeInformation,
                            &cbModeSize);
    if (cModes == 0)
    {
        DISPDBG((0, "DrvGetModes failed to get mode information"));
        return(0);
    }

    if (pdm == NULL)
    {
        cbOutputSize = cModes * (sizeof(DEVMODEW) + DRIVER_EXTRA_SIZE);
    }
    else
    {
        //
        // Now copy the information for the supported modes back into the
        // output buffer
        //

        cbOutputSize = 0;

        pVideoTemp = pVideoModeInformation;

        do
        {
            if (pVideoTemp->Length != 0)
            {
                if (cOutputModes == 0)
                {
                    break;
                }

                //
                // Zero the entire structure to start off with.
                //

                memset(pdm, 0, sizeof(DEVMODEW));

                //
                // Set the name of the device to the name of the DLL.
                //

                memcpy(pdm->dmDeviceName, DLL_NAME, sizeof(DLL_NAME));

                pdm->dmSpecVersion      = DM_SPECVERSION;
                pdm->dmDriverVersion    = DM_SPECVERSION;
                pdm->dmSize             = sizeof(DEVMODEW);
                pdm->dmDriverExtra      = DRIVER_EXTRA_SIZE;

                pdm->dmBitsPerPel       = pVideoTemp->NumberOfPlanes *
                                          pVideoTemp->BitsPerPlane;
                pdm->dmPelsWidth        = pVideoTemp->VisScreenWidth;
                pdm->dmPelsHeight       = pVideoTemp->VisScreenHeight;
                pdm->dmDisplayFrequency = pVideoTemp->Frequency;
                pdm->dmDisplayFlags     = 0;

                pdm->dmFields           = DM_BITSPERPEL       |
                                          DM_PELSWIDTH        |
                                          DM_PELSHEIGHT       |
                                          DM_DISPLAYFREQUENCY |
                                          DM_DISPLAYFLAGS     ;

                //
                // Go to the next DEVMODE entry in the buffer.
                //

                cOutputModes--;

                pdm = (LPDEVMODEW) ( ((ULONG)pdm) + sizeof(DEVMODEW) +
                                                   DRIVER_EXTRA_SIZE);

                cbOutputSize += (sizeof(DEVMODEW) + DRIVER_EXTRA_SIZE);

            }

            pVideoTemp = (PVIDEO_MODE_INFORMATION)
                (((PUCHAR)pVideoTemp) + cbModeSize);


        } while (--cModes);
    }

    EngFreeMem(pVideoModeInformation);

    return(cbOutputSize);
}

/******************************Public*Routine******************************\
* BOOL bAssertModeHardware
*
* Sets the appropriate hardware state for graphics mode or full-screen.
*
\**************************************************************************/

BOOL bAssertModeHardware(
PDEV* ppdev,
BOOL  bEnable)
{
    DWORD ReturnedDataLength;
    ULONG ulReturn;

    if (bEnable)
    {
        // Call the miniport via an IOCTL to set the graphics mode.

        if (EngDeviceIoControl(ppdev->hDriver,
                             IOCTL_VIDEO_SET_CURRENT_MODE,
                             &ppdev->ulMode,  // input buffer
                             sizeof(DWORD),
                             NULL,
                             0,
                             &ReturnedDataLength))
        {
            DISPDBG((0, "bAssertModeHardware - Failed set IOCTL"));
            return FALSE;
        }

        // Then set the rest of the default registers:

        vResetClipping(ppdev);

        IO_FIFO_WAIT(ppdev, 1);
        IO_WRT_MASK(ppdev, -1);
    }
    else
    {
        // Call the kernel driver to reset the device to a known state.
        // NTVDM will take things from there:

        if (EngDeviceIoControl(ppdev->hDriver,
                             IOCTL_VIDEO_RESET_DEVICE,
                             NULL,
                             0,
                             NULL,
                             0,
                             &ulReturn))
        {
            DISPDBG((0, "bAssertModeHardware - Failed reset IOCTL"));
            return FALSE;
        }
    }

    DISPDBG((5, "Passed bAssertModeHardware"));

    return(TRUE);
}

/******************************Public*Routine******************************\
* BOOL bAtiAccelerator
*
* Returns TRUE if we're running on a Mach8 or compatible accelerator.
* This algorithm was taken from "Programmer's Guide to the Mach-8 Extended
* Registers Supplement," 1992, ATI Technologies Inc, p. 5-2.
*
* It seems like a pretty goofy test to me, but it's what they prescribe
* to 'specifically detect an ATI accelerator product.'
*
\**************************************************************************/

BOOL bAtiAccelerator(
PDEV*   ppdev)
{
    ULONG   ulSave;
    BOOL    bAti;

    bAti = FALSE;

    ulSave = INPW(0x52ee);

    OUTPW(0x52ee, 0x5555);
    IO_GP_WAIT(ppdev);
    if (INPW(0x52ee) == 0x5555)
    {
        OUTPW(0x52ee, 0x2a2a);
        IO_GP_WAIT(ppdev);
        if (INPW(0x52ee) == 0x2a2a)
        {
            bAti = TRUE;
        }
    }

    // Restore the register's original contents:

    OUTPW(0x52ee, ulSave);

    return(bAti);
}

/******************************Public*Routine******************************\
* BOOL bEnableHardware
*
* Puts the hardware in the requested mode and initializes it.  Also
* sets ppdev->cyMemory.
*
\**************************************************************************/

BOOL bEnableHardware(
PDEV*   ppdev)
{
    VIDEO_MEMORY             VideoMemory;
    VIDEO_MEMORY_INFORMATION VideoMemoryInfo;
    DWORD                    ReturnedDataLength;

    // Set all the register addresses (to allow easier porting of code
    // from the S3):

    ppdev->ioCur_y              = CUR_Y;
    ppdev->ioCur_x              = CUR_X;
    ppdev->ioDesty_axstp        = DEST_Y;
    ppdev->ioDestx_diastp       = DEST_X;
    ppdev->ioErr_term           = ERR_TERM;
    ppdev->ioMaj_axis_pcnt      = MAJ_AXIS_PCNT;
    ppdev->ioGp_stat_cmd        = CMD;
    ppdev->ioShort_stroke       = SHORT_STROKE;
    ppdev->ioBkgd_color         = BKGD_COLOR;
    ppdev->ioFrgd_color         = FRGD_COLOR;
    ppdev->ioWrt_mask           = WRT_MASK;
    ppdev->ioRd_mask            = RD_MASK;
    ppdev->ioColor_cmp          = COLOR_CMP;
    ppdev->ioBkgd_mix           = BKGD_MIX;
    ppdev->ioFrgd_mix           = FRGD_MIX;
    ppdev->ioMulti_function     = MULTIFUNC_CNTL;
    ppdev->ioPix_trans          = PIX_TRANS;

    // Now we can set the mode, unlock the accelerator, and reset the
    // clipping:

    if (!bAssertModeHardware(ppdev, TRUE))
        goto ReturnFalse;

    // Get the linear memory address range.

    VideoMemory.RequestedVirtualAddress = NULL;

    // About this IOCTL_VIDEO_MAP_VIDEO_MEMORY call.
    //
    // Since we're an 8514/A driver, we don't care squat about any stinking
    // frame buffer mapping.  The only reason we're calling this IOCTL
    // is because we may be running as an 8514/A using the ATI miniport.
    // And this IOCTL is the only way to get the ATI miniport to return
    // the total number of scans of video memory.  'cyMemory' is needed
    // so we can take advantage of as much off-screen memory as possible
    // for the 2-d heap.  It's also conceivable that we're running at
    // 640x480x256 using the ATI miniport on a 512k card, in which case
    // we can't just assume that 'cyMemory' was 1024.
    //
    // So all we're interested in is the 'VideoRamLength' field returned
    // in 'VideoMemoryInfo'.  Currently, any other side effects of
    // making this call with the ATI miniport (such as the actual memory
    // mapping) are inoccuous, and hopefully this will remain to be so in
    // future ATI miniports.
    //
    // If we're running with the 8514/A miniport, this call does nothing
    // but return 1 meg for the 'FrameLength' size:

    if (EngDeviceIoControl(ppdev->hDriver,
                         IOCTL_VIDEO_MAP_VIDEO_MEMORY,
                         &VideoMemory,      // input buffer
                         sizeof(VIDEO_MEMORY),
                         &VideoMemoryInfo,  // output buffer
                         sizeof(VideoMemoryInfo),
                         &ReturnedDataLength))
    {
        DISPDBG((0, "bEnableHardware - Error mapping buffer address"));
        goto ReturnFalse;
    }

    // All we were interested in is 'VideoMemoryInfo', so unmap the buffer
    // straight away:

    VideoMemory.RequestedVirtualAddress = VideoMemoryInfo.FrameBufferBase;

    EngDeviceIoControl(ppdev->hDriver,
                    IOCTL_VIDEO_UNMAP_VIDEO_MEMORY,
                    &VideoMemory,
                    sizeof(VIDEO_MEMORY),
                    NULL,
                    0,
                    &ReturnedDataLength);

    // Note that 8514/A registers cannot handle coordinates any larger
    // than 1535:

    ppdev->cyMemory = VideoMemoryInfo.VideoRamLength / ppdev->lDelta;
    ppdev->cyMemory = min(ppdev->cyMemory, 1535);

    DISPDBG((0, "Memory size %li x %li.", ppdev->cxMemory, ppdev->cyMemory));

    // Set up the jump vectors to our low-level blt routines (which ones are
    // used depends on whether we can do memory-mapped IO or not):

    // Have to do IN/OUTs:

    ppdev->pfnFillSolid     = vIoFillSolid;
    ppdev->pfnFillPat       = vIoFillPatSlow;

    ppdev->pfnXfer4bpp      = vIoXfer4bpp;
    ppdev->pfnXferNative    = vIoXferNative;
    ppdev->pfnCopyBlt       = vIoCopyBlt;
    ppdev->pfnFastLine      = vIoFastLine;
    ppdev->pfnFastFill      = bIoFastFill;

    if (!bAtiAccelerator(ppdev))
    {
        ppdev->pfnXfer1bpp  = vIoXfer1bpp;
    }
    else
    {
        DISPDBG((0, "ATI extensions enabled."));

        // Disable vIoMaskCopy() for fixing bug 143531.

//        ppdev->flCaps |= CAPS_MASKBLT_CAPABLE;

        ppdev->pfnMaskCopy  = vIoMaskCopy;
        ppdev->pfnXfer1bpp  = vIoXfer1bppPacked;
    }

    DISPDBG((5, "Passed bEnableHardware"));

    return(TRUE);

ReturnFalse:

    DISPDBG((0, "Failed bEnableHardware"));

    return(FALSE);
}

/******************************Public*Routine******************************\
* VOID vDisableHardware
*
* Undoes anything done in bEnableHardware.
*
* Note: In an error case, we may call this before bEnableHardware is
*       completely done.
*
\**************************************************************************/

VOID vDisableHardware(
PDEV*   ppdev)
{
}

/******************************Public*Routine******************************\
* BOOL bDetect8514A
*
* Detects whether or not an 8514/A compatible adapter is present.
*
* This code was stolen from the 8514/A miniport.  It simply checks to see
* if the line-drawing error term register is readable/writable.
*
\**************************************************************************/

BOOL bDetect8514A()
{
    USHORT SubSysCntlRegisterValue;
    USHORT ErrTermRegisterValue;
    USHORT ErrTerm5555;
    USHORT ErrTermAAAA;
    BOOL   b8514A;

    //
    // Remember the original value of any registers we'll muck with.
    //

    SubSysCntlRegisterValue = INPW(SUBSYS_CNTL);
    ErrTermRegisterValue = INPW(ERR_TERM);

    //
    // Reset the draw engine.
    //

    OUTPW(SUBSYS_CNTL, 0x9000);
    OUTPW(SUBSYS_CNTL, 0x5000);

    //
    // We detect an 8514/A by writing a value to the error term register,
    // and reading it back to see if it's the same value we wrote.
    //

    OUTPW(ERR_TERM, 0x5555);
    ErrTerm5555 = INPW(ERR_TERM);

    OUTPW(ERR_TERM, 0xAAAA);
    ErrTermAAAA = INPW(ERR_TERM);

    b8514A = ((ErrTerm5555 == 0x5555) && (ErrTermAAAA == 0xAAAA));

    //
    // Now that we're done mucking with the hardware state, we have to
    // restore everything to the way it was.
    //

    OUTPW(ERR_TERM, ErrTermRegisterValue);

    //
    // Since the SUBSYS_CNTL register is not readable on a true 8514/A,
    // don't try to restore it:
    //

    if (!b8514A)
    {
        OUTPW(SUBSYS_CNTL, SubSysCntlRegisterValue);
    }

    return(b8514A);
}

/******************************Public*Routine******************************\
* BOOL bInitializeModeFields
*
* Initializes a bunch of fields in the pdev, devcaps (aka gdiinfo), and
* devinfo based on the requested mode.
*
\**************************************************************************/

BOOL bInitializeModeFields(
PDEV*     ppdev,
GDIINFO*  pgdi,
DEVINFO*  pdi,
DEVMODEW* pdm)
{
    ULONG                   cModes;
    PVIDEO_MODE_INFORMATION pVideoBuffer;
    PVIDEO_MODE_INFORMATION pVideoModeSelected;
    PVIDEO_MODE_INFORMATION pVideoTemp;
    BOOL                    bSelectDefault;
    VIDEO_MODE_INFORMATION  VideoModeInformation;
    ULONG                   cbModeSize;

    // Verify that we have an 8514/A display.  We do this because we can
    // work with the ATI miniport, which supports some cards (notably the
    // Mach64) that aren't 8514/A compatible.

    if (!bDetect8514A())
    {
        DISPDBG((0, "bInitializeModeFields - 8514/A not detected"));
        goto ReturnFalse;
    }

    // Call the miniport to get mode information

    cModes = getAvailableModes(ppdev->hDriver, &pVideoBuffer, &cbModeSize);
    if (cModes == 0)
        goto ReturnFalse;

    // Now see if the requested mode has a match in that table.

    pVideoModeSelected = NULL;
    pVideoTemp = pVideoBuffer;

    if ((pdm->dmPelsWidth        == 0) &&
        (pdm->dmPelsHeight       == 0) &&
        (pdm->dmBitsPerPel       == 0) &&
        (pdm->dmDisplayFrequency == 0))
    {
        DISPDBG((1, "Default mode requested"));
        bSelectDefault = TRUE;
    }
    else
    {
        DISPDBG((1, "Requested mode..."));
        DISPDBG((1, "   Screen width  -- %li", pdm->dmPelsWidth));
        DISPDBG((1, "   Screen height -- %li", pdm->dmPelsHeight));
        DISPDBG((1, "   Bits per pel  -- %li", pdm->dmBitsPerPel));
        DISPDBG((1, "   Frequency     -- %li", pdm->dmDisplayFrequency));

        bSelectDefault = FALSE;
    }

    while (cModes--)
    {
        if (pVideoTemp->Length != 0)
        {
            DISPDBG((2, "   Checking against miniport mode:"));
            DISPDBG((2, "      Screen width  -- %li", pVideoTemp->VisScreenWidth));
            DISPDBG((2, "      Screen height -- %li", pVideoTemp->VisScreenHeight));
            DISPDBG((2, "      Bits per pel  -- %li", pVideoTemp->BitsPerPlane *
                                                      pVideoTemp->NumberOfPlanes));
            DISPDBG((2, "      Frequency     -- %li", pVideoTemp->Frequency));

            if (bSelectDefault ||
                ((pVideoTemp->VisScreenWidth  == pdm->dmPelsWidth) &&
                 (pVideoTemp->VisScreenHeight == pdm->dmPelsHeight) &&
                 (pVideoTemp->BitsPerPlane *
                  pVideoTemp->NumberOfPlanes  == pdm->dmBitsPerPel) &&
                 (pVideoTemp->Frequency       == pdm->dmDisplayFrequency)))
            {
                pVideoModeSelected = pVideoTemp;
                DISPDBG((1, "...Found a mode match!"));
                break;
            }
        }

        pVideoTemp = (PVIDEO_MODE_INFORMATION)
            (((PUCHAR)pVideoTemp) + cbModeSize);

    }

    // If no mode has been found, return an error

    if (pVideoModeSelected == NULL)
    {
        DISPDBG((1, "...Couldn't find a mode match!"));
        EngFreeMem(pVideoBuffer);
        goto ReturnFalse;
    }

    // We have chosen the one we want.  Save it in a stack buffer and
    // get rid of allocated memory before we forget to free it.

    VideoModeInformation = *pVideoModeSelected;
    EngFreeMem(pVideoBuffer);

    #if DEBUG_HEAP
        VideoModeInformation.VisScreenWidth  = 640;
        VideoModeInformation.VisScreenHeight = 480;
    #endif

    // Set up screen information from the mini-port:

    ppdev->ulMode           = VideoModeInformation.ModeIndex;
    ppdev->cxScreen         = VideoModeInformation.VisScreenWidth;
    ppdev->cyScreen         = VideoModeInformation.VisScreenHeight;
    ppdev->lDelta           = VideoModeInformation.ScreenStride;
    ppdev->flCaps           = 0;    // We've have no capabilities

    // Note that 8514/A registers cannot handle coordinates any larger
    // than 1535:

    ppdev->cxMemory         = min(VideoModeInformation.ScreenStride, 1535);

    // Note: We compute 'cyMemory' later at DrvEnableSurface time.  For now,
    //       set cyMemory to an interesting value to aid in debugging:

    ppdev->cyMemory         = 0xdeadbeef;

    DISPDBG((1, "ScreenStride: %lx", VideoModeInformation.ScreenStride));

    ppdev->flHooks          = (HOOK_BITBLT     |
                               HOOK_TEXTOUT    |
                               HOOK_FILLPATH   |
                               HOOK_COPYBITS   |
                               HOOK_STROKEPATH |
                               HOOK_PAINT      |
                               HOOK_STRETCHBLT);

    // Fill in the GDIINFO data structure with the default 8bpp values:

    *pgdi = ggdiDefault;

    // Now overwrite the defaults with the relevant information returned
    // from the kernel driver:

    pgdi->ulHorzSize        = VideoModeInformation.XMillimeter;
    pgdi->ulVertSize        = VideoModeInformation.YMillimeter;

    pgdi->ulHorzRes         = VideoModeInformation.VisScreenWidth;
    pgdi->ulVertRes         = VideoModeInformation.VisScreenHeight;
    pgdi->ulPanningHorzRes  = VideoModeInformation.VisScreenWidth;
    pgdi->ulPanningVertRes  = VideoModeInformation.VisScreenHeight;

    pgdi->cBitsPixel        = VideoModeInformation.BitsPerPlane;
    pgdi->cPlanes           = VideoModeInformation.NumberOfPlanes;
    pgdi->ulVRefresh        = VideoModeInformation.Frequency;

    pgdi->ulDACRed          = VideoModeInformation.NumberRedBits;
    pgdi->ulDACGreen        = VideoModeInformation.NumberGreenBits;
    pgdi->ulDACBlue         = VideoModeInformation.NumberBlueBits;

    pgdi->ulLogPixelsX      = pdm->dmLogPixels;
    pgdi->ulLogPixelsY      = pdm->dmLogPixels;

    // Fill in the devinfo structure with the default 8bpp values:

    *pdi = gdevinfoDefault;

    ppdev->cPelSize        = 0;
    ppdev->iBitmapFormat   = BMF_8BPP;
    ppdev->ulWhite         = 0xff;

    // Assuming palette is orthogonal - all colors are same size.

    ppdev->cPaletteShift   = 8 - pgdi->ulDACRed;

    DISPDBG((5, "Passed bInitializeModeFields"));

    return(TRUE);

ReturnFalse:

    DISPDBG((0, "Failed bInitializeModeFields"));

    return(FALSE);
}

/******************************Public*Routine******************************\
* DWORD getAvailableModes
*
* Calls the miniport to get the list of modes supported by the kernel driver,
* and returns the list of modes supported by the diplay driver among those
*
* returns the number of entries in the videomode buffer.
* 0 means no modes are supported by the miniport or that an error occured.
*
* NOTE: the buffer must be freed up by the caller.
*
\**************************************************************************/

DWORD getAvailableModes(
HANDLE                   hDriver,
PVIDEO_MODE_INFORMATION* modeInformation,
DWORD*                   cbModeSize)
{
    ULONG                   ulTemp;
    VIDEO_NUM_MODES         modes;
    PVIDEO_MODE_INFORMATION pVideoTemp;

    //
    // Get the number of modes supported by the mini-port
    //

    if (EngDeviceIoControl(hDriver,
            IOCTL_VIDEO_QUERY_NUM_AVAIL_MODES,
            NULL,
            0,
            &modes,
            sizeof(VIDEO_NUM_MODES),
            &ulTemp))
    {
        DISPDBG((0, "getAvailableModes - Failed VIDEO_QUERY_NUM_AVAIL_MODES"));
        return(0);
    }

    *cbModeSize = modes.ModeInformationLength;

    //
    // Allocate the buffer for the mini-port to write the modes in.
    //

    *modeInformation = (PVIDEO_MODE_INFORMATION)
                        EngAllocMem(FL_ZERO_MEMORY,
                                   modes.NumModes *
                                   modes.ModeInformationLength, ALLOC_TAG);

    if (*modeInformation == (PVIDEO_MODE_INFORMATION) NULL)
    {
        DISPDBG((0, "getAvailableModes - Failed EngAllocMem"));
        return 0;
    }

    //
    // Ask the mini-port to fill in the available modes.
    //

    if (EngDeviceIoControl(hDriver,
            IOCTL_VIDEO_QUERY_AVAIL_MODES,
            NULL,
            0,
            *modeInformation,
            modes.NumModes * modes.ModeInformationLength,
            &ulTemp))
    {

        DISPDBG((0, "getAvailableModes - Failed VIDEO_QUERY_AVAIL_MODES"));

        EngFreeMem(*modeInformation);
        *modeInformation = (PVIDEO_MODE_INFORMATION) NULL;

        return(0);
    }

    //
    // Now see which of these modes are supported by the display driver.
    // As an internal mechanism, set the length to 0 for the modes we
    // DO NOT support.
    //

    ulTemp = modes.NumModes;
    pVideoTemp = *modeInformation;

    //
    // Mode is rejected if it is not one plane, or not graphics, or is not
    // 8 bits per pel.
    //

    while (ulTemp--)
    {
        if ((pVideoTemp->NumberOfPlanes != 1 ) ||
            !(pVideoTemp->AttributeFlags & VIDEO_MODE_GRAPHICS) ||
             (pVideoTemp->BitsPerPlane != 8))
        {
            DISPDBG((2, "Rejecting miniport mode:"));
            DISPDBG((2, "   Screen width  -- %li", pVideoTemp->VisScreenWidth));
            DISPDBG((2, "   Screen height -- %li", pVideoTemp->VisScreenHeight));
            DISPDBG((2, "   Bits per pel  -- %li", pVideoTemp->BitsPerPlane *
                                                   pVideoTemp->NumberOfPlanes));
            DISPDBG((2, "   Frequency     -- %li", pVideoTemp->Frequency));

            pVideoTemp->Length = 0;
        }

        pVideoTemp = (PVIDEO_MODE_INFORMATION)
            (((PUCHAR)pVideoTemp) + modes.ModeInformationLength);
    }

    return(modes.NumModes);
}