/*
 * video.c - Video implementation for Vice/2, using DIVE.
 *
 * Written by
 *  Thomas Bretz <tbretz@gsi.de>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 *
 */
#include "vice.h"

#define INCL_GPI             // RGNRECT
#define INCL_WINSYS          // SV_CYTITLEBAR
#define INCL_WINHELP         // WinCreateHelpInstance
#define INCL_WININPUT        // WM_CHAR
#define INCL_WINMENUS        // PU_*
#define INCL_WINERRORS       // WInGetLastError
#define INCL_WINSTDDRAG      // PDRAGINFO in dragndrop.h
#define INCL_DOSPROCESS      // DosSleep
#define INCL_WINSTATICS      // SS_TEXT
#define INCL_WINFRAMEMGR     // WM_TRANSLATEACCEL
#define INCL_WINWINDOWMGR    // QWL_USER
#define INCL_DOSSEMAPHORES   // HMTX

#include <os2.h>

#ifdef WATCOM_COMPILE
#define INCL_MMIOOS2
#else
#define INCL_MMIO
#endif

#define INCL_MM_OS2          // DiveBlitImageLines
#include <os2me.h>

#if defined(__IBMC__) || defined(WATCOM_COMPILE)
#include "fullscr.h"
#include <fourcc.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#ifdef __EMX__
#include <graph.h>
#endif

#ifdef WATCOM_COMPILE
#include <process.h>
#endif

#include "video.h"
#include "videoarch.h"

#include "lib.h"
#include "log.h"
#include "proc.h"
#include "util.h"
#include "vsync.h"
#include "dialogs.h"         // IDM_VICE2
#include "menubar.h"
#include "dragndrop.h"
#include "cmdline.h"
#include "resources.h"
#include "translate.h"
#include "viewport.h"

#include "machine.h"         // machine_canvas_screenshot
#include "screenshot.h"      // screenshot_t

#ifdef HAVE_MOUSE
#include "mousedrv.h"
#endif

#include "version.h"

#ifdef DIRECT_ACCESS
#define divecaps.fccColorEncoding
#define divecaps.ulDepth
#endif

//
//  VICE Speed Test... Warp Mode: Speed(%), Frames per Second (fps)
//
//                            Vice1.7   DIRECT    LUT8     R565
//  -------------------------------------------------------------
//   1x         Video Cached  1600,74  1570,72  1560,72  1550,71
//   1x                       1160,50   930,43  1160,50  1090,50
//   2xStretch  Video Cached  1500,70           1500,69  1500,69
//   2xStretch                 660,30            640,29   630,29
//   DScan/Size Video Cached           1520,70  1510,69  1490,68
//   DScan/Size                         660,31   610,28   570,27
//
//  Maybe I can make this switchable...
//

#define DEBUG(txt)

static log_t vidlog = LOG_ERR;

extern void archdep_create_mutex_sem(HMTX *hmtx, const char *pszName, int fState);

static CHAR szClientClass [] = "VICE/2 Grafic Area";
static CHAR szTitleBarText[] = "VICE/2 " VERSION;
static ULONG flFrameFlags = FCF_ICON | FCF_MENU | FCF_TITLEBAR | FCF_ACCELTABLE | FCF_SHELLPOSITION | FCF_SYSMENU | FCF_TASKLIST | FCF_AUTOICON | FCF_MINBUTTON | FCF_CLOSEBUTTON;

/* ------------------------------------------------------------------------ */
/* Video-related resources.                                                 */

int stretch;            // Strech factor for window (1,2,3,...)
static int border;      // PM Border Type
static int menu;        // flag if menu should be enabled
static int status = 0;  // flag if status should be enabled
static HWND *hwndlist = NULL;

extern void WmVrnDisabled(HWND hwnd);
extern void WmVrnEnabled(HWND hwnd);

static inline video_canvas_t *GetCanvas(HWND hwnd)
{
    return (video_canvas_t *)WinQueryWindowPtr(hwnd, QWL_USER);
}

static void AddToWindowList(HWND hwnd)
{
    int i = 0;
    HWND *newlist;

    if (!hwndlist) {
        //
        // If no list exists yet, creat an empty one
        //
        hwndlist = malloc(sizeof(HWND));
        hwndlist[0] = NULLHANDLE;
    }

    //
    // Count valid entries in list
    //
    while (hwndlist[i]) {
        i++;
    }

    //
    // create new list
    //
    newlist = malloc(sizeof(HWND) * (i + 2));

    //
    // copy old list to new list an delete old list
    //
    memcpy(newlist, hwndlist, sizeof(HWND) * i);
    lib_free(hwndlist);

    hwndlist = newlist;

    //
    // add new entry to list
    //
    hwndlist[i] = hwnd;
    hwndlist[i + 1] = NULLHANDLE;
}

static int set_stretch_factor(int val, void *param)
{
    int i = 0;

    if (!hwndlist || stretch == val) {
        stretch = val;
        return 0;
    }

    //
    // set new stretch factor
    //
    stretch = val;

    i = 0;
    while (hwndlist[i]) {
        video_canvas_t *c = GetCanvas(hwndlist[i]);

        if (!DosRequestMutexSem(c->hmtx, SEM_INDEFINITE_WAIT)) {
            //
            // resize canvas
            //
            const int dsx = c->videoconfig->doublesizex + 1;
            const int dsy = c->videoconfig->doublesizey + 1;

            video_canvas_resize(c, c->width/dsx, c->height/dsy);

            DosReleaseMutexSem(c->hmtx);
        }
        i++;
    }

    return 0;
}

void CanvasDisplaySpeed(int speed, int frame_rate, int warp_enabled)
{
    int i = 0;

    if (!hwndlist) {
        return;
    }

    if (!FullscreenIsNow()) {
        i = 0;

        while (hwndlist[i]) {
            const video_canvas_t *c = GetCanvas(hwndlist[i++]);
            char *txt = lib_msprintf("%s - %d%% - %dfps %s", c->title, speed, frame_rate, warp_enabled ? "(Warp)" : "");
            WinSetWindowText(c->hwndTitlebar, txt);
            lib_free(txt);
        }
    }
}

/* ------------------------------------------------------------------------ */
static UINT border_size_x(void)
{
    switch (border) {
        case 1:
            return WinQuerySysValue(HWND_DESKTOP, SV_CXBORDER);
        case 2:
            return WinQuerySysValue(HWND_DESKTOP, SV_CXDLGFRAME);
    }
    return 0;
}

static UINT border_size_y(void)
{
    switch (border) {
        case 1:
            return WinQuerySysValue(HWND_DESKTOP, SV_CYBORDER);
        case 2:
            return WinQuerySysValue(HWND_DESKTOP, SV_CYDLGFRAME);
    }
    return 0;
}

static UINT statusbar_height(void)
{
    const UINT fntht = 11;
    const UINT bdry = WinQuerySysValue(HWND_DESKTOP, SV_CYBORDER);
    const UINT offset = border == 2 ? 0 : 2;

    return fntht + 2 * bdry + 2 + offset + 3;
}

static UINT GetWindowHeight(video_canvas_t *c)
{
    UINT height = c->height;

    height *= c->stretch;
    height += WinQuerySysValue(HWND_DESKTOP, SV_CYTITLEBAR);
    height += 2 * border_size_y();
    if (menu) {
        height += WinQuerySysValue(HWND_DESKTOP, SV_CYMENU) + 1;
    }
    if (status) {
        height += statusbar_height();
    }

    return height;
}

static UINT GetWindowWidth(video_canvas_t *c)
{
    UINT width = c->width;

    width *= c->stretch;
#ifdef __XVIC__
    width *= 2;
#endif
    width += 2 * border_size_x();

    return width;
}

/* ------------------------------------------------------------------------ */

static int set_menu(int val, void *param)
{
    int i = 0;

    menu = val;

    if (!hwndlist) {
        return 0;
    }

    while (hwndlist[i]) {
        video_canvas_t *c = GetCanvas(hwndlist[i++]);
        //
        // correct window size
        //
        WinSetWindowPos(c->hwndFrame, 0, 0, 0, GetWindowWidth(c), GetWindowHeight(c), SWP_SIZE | SWP_MINIMIZE);

        //
        // show or hide the menu bar
        //
        WinSetParent(c->hwndMenu, menu ? c->hwndFrame : HWND_OBJECT, FALSE);

        //
        // update frame (show or hide menubar physically)
        //
        // REMARK: instead of updating the frame I minimaze the
        // window and maximize it again. This makes sure that
        // the menubar is shown and not only activated. I don't know
        // why, but it seems to work well. (I don't use HIDE and
        // SHOW because this two functions are animated)
        //
        // WinSendMsg(c->hwndFrame, WM_UPDATEFRAME, (void*)FCF_MENU, NULL);

        WinSetWindowPos(c->hwndFrame, 0, 0, 0, 0, 0, SWP_RESTORE);
    }
    return 0;
}

static int set_border_type(int val, void *param)
{
    switch (val)
    {
        case 1:
            flFrameFlags &= ~FCF_DLGBORDER;
            flFrameFlags |= FCF_BORDER;
            border = 1;
            break;
        case 2:
            flFrameFlags &= ~FCF_BORDER;
            flFrameFlags |= FCF_DLGBORDER;
            border = 2;
            break;
        default:
            flFrameFlags &= ~FCF_BORDER;
            flFrameFlags &= ~FCF_DLGBORDER;
            border = 0;
    }
    return 0;
}

static int logwin;

static int set_logging(int val, void *param)
{
    logwin = val;

    return 0;
}

static const resource_int_t resources1_int[] = {
#ifndef DIRECT_ACCESS
    { "WindowStretchFactor", 1, RES_EVENT_NO, NULL,
      &stretch, set_stretch_factor, NULL },
#endif
    { "PMBorderType", 2, RES_EVENT_NO, NULL,
      &border, set_border_type, NULL },
    { "Menubar", 1, RES_EVENT_NO, NULL,
      &menu, set_menu, NULL },
    { NULL }
};

static const resource_int_t resources2_int[] = {
    { "Logwin", 1, RES_EVENT_NO, NULL,
      &logwin, set_logging, NULL },
    { NULL }
};

int video_arch_resources_init(void)
{
    return (vsid_mode ? 0 : resources_register_int(resources1_int)) | resources_register_int(resources2_int);
}

void video_arch_resources_shutdown(void)
{
}

static const cmdline_option_t cmdline_options1[] = {
#ifndef DIRECT_ACCESS
    { "-stretch", SET_RESOURCE, 1,
      NULL, NULL, "WindowStretchFactor", NULL,
      USE_PARAM_STRING, USE_DESCRIPTION_STRING,
      IDCLS_UNUSED, IDCLS_UNUSED,
      "<number>", "Specify stretch factor for PM Windows (1,2,3,...)" },
#endif
    { "-border",  SET_RESOURCE, 1,
      NULL, NULL, "PMBorderType", NULL,
      USE_PARAM_STRING, USE_DESCRIPTION_STRING,
      IDCLS_UNUSED, IDCLS_UNUSED,
      "<number>", "Specify window border type (1=small, 2=dialog, else=no border)" },
    { "-menu", SET_RESOURCE, 0,
      NULL, NULL, "Menubar", (resource_value_t) 1,
      USE_PARAM_STRING, USE_DESCRIPTION_STRING,
      IDCLS_UNUSED, IDCLS_UNUSED,
      NULL, "Enable Main Menu Bar" },
    { "+menu", SET_RESOURCE, 0,
      NULL, NULL, "Menubar", (resource_value_t) 0,
      USE_PARAM_STRING, USE_DESCRIPTION_STRING,
      IDCLS_UNUSED, IDCLS_UNUSED,
      NULL, "Disable Main Menu Bar" },
    { NULL }
};

static const cmdline_option_t cmdline_options2[] = {
    { "-logwin", SET_RESOURCE, 0,
      NULL, NULL, "Logwin", (resource_value_t) 1,
      USE_PARAM_STRING, USE_DESCRIPTION_STRING,
      IDCLS_UNUSED, IDCLS_UNUSED,
      NULL, "Enable Logging Window" },
    { "+logwin", SET_RESOURCE, 0,
      NULL, NULL, "Logwin", (resource_value_t) 0,
      USE_PARAM_STRING, USE_DESCRIPTION_STRING,
      IDCLS_UNUSED, IDCLS_UNUSED,
      NULL, "Disable Logging Window" },
    { NULL }
};

int video_init_cmdline_options(void)
{
    return (vsid_mode ? 0 : cmdline_register_options(cmdline_options1)) | cmdline_register_options(cmdline_options2);
}

/* ------------------------------------------------------------------------ */

const int DIVE_RECTLS = 50;
static DIVE_CAPS divecaps;

extern HMTX hmtxKey;

void KbdOpenMutex(void)
{
    ULONG rc;

    //
    // FIXME
    // Is this the right place to initialize the keyboard semaphore?
    //
    rc = DosCreateMutexSem("\\SEM32\\Vice2\\Keyboard", &hmtxKey, 0, FALSE);
    if (rc == 258) {
        //
        // we are in a different process (eg. second instance of x64)
        //
        rc = DosOpenMutexSem("\\SEM32\\Vice2\\Keyboard", &hmtxKey);
        if (!rc) {
            log_error(vidlog, "DosOpenMutexSem (rc=%li)", rc);
        }
        return;
    }

    if (rc) {
        log_error(vidlog, "DosCreateMutexSem (rc=%li)", rc);
    }
}

static int PM_winActive;

typedef struct _kstate
{
    BYTE scrllock;
    BYTE capslock;
} kstate;

static kstate vk_vice;
static kstate vk_desktop;

extern int use_leds;

void KbdInit(void)
{
    BYTE keyState[256];

    DosRequestMutexSem(hmtxKey, SEM_INDEFINITE_WAIT);
    WinSetKeyboardStateTable(HWND_DESKTOP, keyState, FALSE);

    //
    // store desktop LED status
    //
    vk_desktop.scrllock = keyState[VK_SCRLLOCK];
    vk_desktop.capslock = keyState[VK_CAPSLOCK];

    //
    // if allowed by user: switch LEDs off
    //
    if (use_leds) {
        keyState[VK_SCRLLOCK] = 0;   // switch off
        keyState[VK_CAPSLOCK] = 0;   // switch off
        WinSetKeyboardStateTable(HWND_DESKTOP, keyState, TRUE);
    }
    PM_winActive = TRUE;
    DosReleaseMutexSem(hmtxKey);
}

void KbdDestroy(void)
{
    BYTE keyState[256];

    DosRequestMutexSem(hmtxKey, SEM_INDEFINITE_WAIT);
    WinSetKeyboardStateTable(HWND_DESKTOP, keyState, FALSE);

    //
    // restore desktop LED status
    //
    keyState[VK_SCRLLOCK] = vk_desktop.scrllock;
    keyState[VK_CAPSLOCK] = vk_desktop.capslock;
    WinSetKeyboardStateTable(HWND_DESKTOP, keyState, TRUE);
    PM_winActive = FALSE;
    DosReleaseMutexSem(hmtxKey);
}

int video_init(void) // initialize Dive
{
    APIRET rc;

    vidlog = log_open("Video");

    if (vsid_mode) {
        return 0;
    }

    log_message(vidlog, "Query Dive capabilities...");

    divecaps.ulStructLen = sizeof(DIVE_CAPS);
    divecaps.ulFormatLength = 0;

    rc = DiveQueryCaps(&divecaps, DIVE_BUFFER_SCREEN);

    if (rc != DIVE_SUCCESS && rc!=DIVE_ERR_INSUFFICIENT_LENGTH) {
        log_error(vidlog, "DiveQueryCaps failed (rc=0x%x)", rc);
        return -1;
    }

    rc = divecaps.fccColorEncoding;
    log_message(vidlog, "Detected Display = %dx%dx%d (%c%c%c%c)", divecaps.ulHorizontalResolution, divecaps.ulVerticalResolution, divecaps.ulDepth, rc, rc >> 8, rc >> 16, rc >> 24);
    log_message(vidlog, "%d Planes, %dkB VRAM%s%s", divecaps.ulPlaneCount, divecaps.ulApertureSize / 1024,
                divecaps.fScreenDirect ? ", Direct access supported" : "", divecaps.fBankSwitched ? ", Bank switch required" : "");

    // As DIVE does not support conversion between RGB and BGR formats,
    // we have to match the source FCC with the desktop FCC
    if (divecaps.fccColorEncoding == FOURCC_BGR4 || divecaps.fccColorEncoding == FOURCC_BGR3) {
        divecaps.fccColorEncoding = FOURCC_BGR3;
    } else if (divecaps.fccColorEncoding==FOURCC_RGB4 || divecaps.fccColorEncoding==FOURCC_RGB3) {
        divecaps.fccColorEncoding = FOURCC_RGB3;
    } else if (divecaps.fccColorEncoding != FOURCC_LUT8 && divecaps.fccColorEncoding != FOURCC_R565) {
        divecaps.fccColorEncoding = FOURCC_RGB3;
    }

    rc = divecaps.fccColorEncoding;
    log_message(vidlog, "Vice internal rendering switched to %c%c%c%c.", rc, rc >> 8, rc >> 16, rc >> 24);

    log_message(vidlog, "Initializing Fullscreen Capabilities...");

#ifndef __X128__
    if (FullscreenInit(divecaps.fccColorEncoding) != NO_ERROR) {
        FullscreenFree();
    }
#endif

    //
    // Init Keyboard Led handling
    //
    KbdOpenMutex();
    KbdInit();

    return 0;
}

void video_shutdown(void)
{
}

void video_close(void)
{
    FullscreenFree();
    KbdDestroy();
}

/* ------------------------------------------------------------------------ */
/* PM Window mainloop */

static ULONG GetDepth(FOURCC fcc)
{
    //
    // Should be used only for 'valid' modes: LUT8, R565, RGB3, RGB4
    //
    switch (fcc) {
        case FOURCC_LUT8:
            return 8;
        case FOURCC_R565:
        case FOURCC_R555:
        case FOURCC_R664:
            return 16;
        case FOURCC_RGB3:
        case FOURCC_BGR3:
            return 24;
        case FOURCC_RGB4:
        case FOURCC_BGR4:
            return 32;
    }
    return 0;
}

static ULONG GetRed(FOURCC fcc, ULONG n)
{
    switch (fcc) {
        case FOURCC_R565:
            return (n >> 3) << 11;
        case FOURCC_R555:
            return (n >> 3) << 10;
        case FOURCC_R664:
            return (n >> 2) << 10;
        case FOURCC_RGB3:
        case FOURCC_RGB4:
            return n << 16;
        case FOURCC_BGR3:
        case FOURCC_BGR4:
            return n;
    }
    return 0;
}

static ULONG GetGreen(FOURCC fcc, ULONG n)
{
    switch (fcc) {
        case FOURCC_R565:
            return (n >> 2) << 5;
        case FOURCC_R555:
            return (n >> 3) << 5;
        case FOURCC_R664:
            return (n >> 2) << 4;
        case FOURCC_RGB3:
        case FOURCC_RGB4:
            return n << 8;
        case FOURCC_BGR3:
        case FOURCC_BGR4:
            return n << 8;
    }
    return 0;
}

static ULONG GetBlue(FOURCC fcc, ULONG n)
{
    switch (fcc) {
        case FOURCC_R565:
        case FOURCC_R555:
            return (n >> 3);
        case FOURCC_R664:
            return (n >> 4);
        case FOURCC_RGB3:
        case FOURCC_RGB4:
            return n;
        case FOURCC_BGR3:
        case FOURCC_BGR4:
            return n << 16;
    }
    return 0;
}

static void VideoInitRenderer(video_canvas_t *c)
{
    const FOURCC fcc = c->divesetup.fccSrcColorFormat;
    int i;

    // video_render_setrawrgb: index, r, g, b
    for (i = 0; i < 0x100; i++) {
        video_render_setrawrgb(i, GetRed(fcc, i), GetGreen(fcc, i), GetBlue(fcc, i));
    }

    video_render_initraw();
}

video_canvas_t *initcanvas;

MRESULT WmCreate(HWND hwnd)
{
    ULONG rc;

    video_canvas_t *canvas_new = initcanvas;

    archdep_create_mutex_sem(&canvas_new->hmtx, "Video", FALSE);

    //
    // Setup divesetup, so that dive doesn't crash when trying to call
    // DiveSetupBlitter. This can happen as soon as hDiveInst != 0
    //
    canvas_new->hDiveInst = 0;

    canvas_new->divesetup.ulStructLen = sizeof(SETUP_BLITTER);
    canvas_new->divesetup.ulDitherType = 0;			// 0=1x1, 1=2x2
    canvas_new->divesetup.fInvert = 0;			      // Bit0=vertical, Bit1=horz
    canvas_new->divesetup.fccSrcColorFormat = divecaps.fccColorEncoding;
    canvas_new->bDepth = GetDepth(divecaps.fccColorEncoding);
    canvas_new->divesetup.fccDstColorFormat = FOURCC_SCRN;
    canvas_new->divesetup.pVisDstRects = calloc(DIVE_RECTLS, sizeof(RECTL));

    //
    // this is a dummy setup. It is needed for some graphic
    // drivers that they get valid values for the first time we
    // setup the dive blitter regions
    //
    canvas_new->divesetup.ulSrcWidth = 1;
    canvas_new->divesetup.ulSrcHeight = 1;
    canvas_new->divesetup.ulSrcPosX = 0;
    canvas_new->divesetup.ulSrcPosY = 0;
    canvas_new->divesetup.ulDstWidth = 1;
    canvas_new->divesetup.ulDstHeight = 1;
    canvas_new->divesetup.lDstPosX = 0;
    canvas_new->divesetup.lDstPosY = 0;

    //
    // No try to open a dive instance for this window.
    //
    if (rc = DiveOpen(&canvas_new->hDiveInst, FALSE, &canvas_new->pVram)) {
        log_error(vidlog, "DiveOpen failed (rc=0x%x)", rc);

        //
        // Stop window creation
        //
        return (MRESULT)TRUE;
    }

    log_message(vidlog, "Dive instance #%d opened successfully (Vram=%p)", canvas_new->hDiveInst, canvas_new->pVram);

    //
    // Now initialize and setuip vice renderers
    //
    VideoInitRenderer(canvas_new);

    //
    // set user data pointer to newly created canvas structure
    //
    WinSetWindowPtr(hwnd, QWL_USER, canvas_new);

    //
    // Continue window creation
    //
    return FALSE;
}

void VideoBufferFree(video_canvas_t *c)
{
    ULONG rc;

    if (!c->bitmaptrg) {
        return;
    }

    if (rc = DiveFreeImageBuffer(c->hDiveInst, c->ulBuffer)) {
        log_error(vidlog,"DiveFreeImageBuffer (rc=0x%x).", rc);
    } else {
        log_message(vidlog,"Dive buffer #%d freed.", c->ulBuffer);
    }

    lib_free(c->bitmaptrg);
}

void WmDestroy(HWND hwnd)
{
    video_canvas_t *c = GetCanvas(hwnd);

    if (!c) {
        return;
    }
}

void WmSetSelection(MPARAM mp1)
{
    BYTE keyState[256];

    DosRequestMutexSem(hmtxKey, SEM_INDEFINITE_WAIT);
    WinSetKeyboardStateTable(HWND_DESKTOP, keyState, FALSE);
    //
    // restore vice keyboard LED status (user switched to vice window)
    //
    if (mp1 && !PM_winActive) {
        //
        // store system LED status for later usage
        //
        vk_desktop.scrllock = keyState[VK_SCRLLOCK];
        vk_desktop.capslock = keyState[VK_CAPSLOCK];

        //
        // set new status for LEDs if allowed by user
        //
        if (use_leds) {
            keyState[VK_SCRLLOCK] = vk_vice.scrllock;  // restore warp led status
            keyState[VK_CAPSLOCK] = 0;                 // drive led off
            WinSetKeyboardStateTable(HWND_DESKTOP, keyState, TRUE);
        }
        PM_winActive = TRUE;
    }

    //
    // restore system keyboard LED status (user switched away from vice window)
    //
    if (!mp1 && PM_winActive) {
        //
        // store SCRLLOCK status for later use
        //
        vk_vice.scrllock = keyState[VK_SCRLLOCK];

        //
        // restore system LED status
        //
        keyState[VK_SCRLLOCK] = vk_desktop.scrllock;
        keyState[VK_CAPSLOCK] = vk_desktop.capslock;
        WinSetKeyboardStateTable(HWND_DESKTOP, keyState, TRUE);
        PM_winActive = FALSE;
    }
    DosReleaseMutexSem(hmtxKey);
}

void WmVrnEnabled(HWND hwnd)
{
    HPS hps;
    HRGN hrgn;

    video_canvas_t *c = GetCanvas(hwnd);

    DEBUG("WM VRN ENABLED 0");

    if (!c->hDiveInst) {
        return;
    }

    hps = WinGetPS(hwnd);
    hrgn = GpiCreateRegion(hps, 0L, NULL);

    DEBUG("WM VRN 0");

    if (hrgn) { // this should be controlled again (clr/home, stretch 3)
        RGNRECT rgnCtl;

        WinQueryVisibleRegion(hwnd, hrgn);

        rgnCtl.ircStart = 1;
        rgnCtl.crc = DIVE_RECTLS;
        rgnCtl.ulDirection = RECTDIR_LFRT_BOTTOP;

        if (GpiQueryRegionRects(hps, hrgn, NULL, &rgnCtl, c->divesetup.pVisDstRects)) {
            SWP swp;
            POINTL pointl;

            WinQueryWindowPos(hwnd, &swp);
            pointl.x = swp.x;
            pointl.y = swp.y;
            WinMapWindowPoints(c->hwndFrame, HWND_DESKTOP, &pointl, 1);

            c->divesetup.lScreenPosX = pointl.x;
#ifndef DIRECT_ACCESS
            c->divesetup.lScreenPosY = pointl.y;
#else
            c->divesetup.lScreenPosY = divecaps.ulVerticalResolution - (pointl.y + c->height);
#endif
            c->divesetup.ulNumDstRects = rgnCtl.crcReturned;

            // FIXME? Correct?
            if (FullscreenIsInFS()) {
                const int w = FullscreenQueryHorzRes();
                const int h = FullscreenQueryVertRes();

                c->divesetup.ulNumDstRects = 1;
                c->divesetup.pVisDstRects[0].xLeft = 0;
                c->divesetup.pVisDstRects[0].xRight = w;
                c->divesetup.pVisDstRects[0].yBottom = 0;
                c->divesetup.pVisDstRects[0].yTop = h;
                c->divesetup.lScreenPosY = (h - c->stretch * c->height) / 2;
#ifdef __XVIC__
                c->divesetup.lScreenPosX = (w - c->stretch * c->width * 2) / 2;
#else
                c->divesetup.lScreenPosX = (w - c->stretch * c->width) / 2;
#endif
            }
        }
        GpiDestroyRegion(hps, hrgn);
    }
    WinReleasePS(hps);

    c->vrenabled=TRUE;

    DEBUG("WM VRN ENABLED 1");
}

void WmVrnDisabled(HWND hwnd)
{
    video_canvas_t *c = GetCanvas(hwnd);
    ULONG rc;

    DEBUG("WM VRN DISABLED 0");

    if (!c->hDiveInst) {
        return;
    }

    //
    // Now stop drawing into this canvas
    //
    c->vrenabled = FALSE;

    rc = DiveSetupBlitter(c->hDiveInst, NULL);
    if (rc != DIVE_SUCCESS) {
        log_error(vidlog, "WmVrnDisabled: Call to DiveSetupBlitter failed, rc = 0x%x", rc);
        return;
    }

    DEBUG("WM VRN DISABLED 1");
}

void VideoCanvasBlit(video_canvas_t *c, UINT xs, UINT ys, UINT xi, UINT yi, UINT w, UINT h)
{
    ULONG rc;
    ULONG numlines = 0;
    ULONG scanlinesize = 0;
    BYTE *targetbuffer = NULL;

    const int dsx = c->videoconfig->doublesizex + 1;
    const int dsy = c->videoconfig->doublesizey + 1;

    const UINT linesz = dsx * c->draw_buffer->draw_buffer_width;
    const UINT bufh = dsy * c->draw_buffer->draw_buffer_height;

    /*********FIXME?**********/
    if (c->ulBuffer == 0) {
        return;
    }
    /*************************/

    //
    // xs, xy is double sized
    // w,  h  is double sized
    // xi, yi is double sized
    //
    if (xs +w > linesz) {
        log_message(vidlog, "Debug - fbuf read x: %d + %d > %d, c->width=%d", xs, w, linesz, c->width);
        w = linesz - xs;
    }
    if (ys + h > bufh) {
        log_message(vidlog, "Debug - fbuf read y: %d + %d > %d, c->height=%d", ys, h, bufh, c->height);
        h = bufh - ys;
    }
    if (xi + w > c->width) {
        log_message(vidlog, "Debug - scr write x x%d: %d + %d > %d", dsx, xi, w, c->width);
        w = c->width - xi;
    }
    if (yi + h > c->height) {
        log_message(vidlog, "Debug - scr write y x%d: %d + %d > %d", dsy, yi, h, c->height);
        h = c->height - yi;
    }

#ifndef DIRECT_ACCESS
    //
    // calculate source and destinations
    //
    c->divesetup.ulSrcWidth = w;
    c->divesetup.ulSrcHeight = h;
    c->divesetup.ulSrcPosX = xi;
    c->divesetup.ulSrcPosY = yi;
    c->divesetup.ulDstHeight = stretch * h;
#ifdef __XVIC__
    c->divesetup.ulDstWidth = stretch * w * 2;
    c->divesetup.lDstPosX = stretch * xi * 2;
#else
    c->divesetup.ulDstWidth = stretch * w;
    c->divesetup.lDstPosX = stretch * xi;
#endif
    c->divesetup.lDstPosY = (c->height - (yi + h)) * stretch;

    //
    // now setup the draw areas
    // (all other values are set already by WM_VRNENABLED)
    //
    // FIXME: maybe this should only be done when
    //        video cache is enabled
    rc = DiveSetupBlitter(c->hDiveInst, &c->divesetup);
    if (rc != DIVE_SUCCESS) {
        log_error(vidlog, "VideoCanvasBlit: Call to DiveSetupBlitter failed, rc = 0x%x", rc);
        return;
    }

    //
    // Dependant on the underlaying hardware here we get
    // the targetbuffer pointer, the scanlinesize and
    // the number of scanlines
    //
    rc = DiveBeginImageBufferAccess(c->hDiveInst, c->ulBuffer, &targetbuffer, &scanlinesize, &numlines);
    if (rc != DIVE_SUCCESS) {
        log_error(vidlog, "Call to DiveBeginImageBufferAccess(%d, %d) failed, rc = 0x%x", c->hDiveInst, c->ulBuffer, rc);
        return;
    }
    video_canvas_render(c,
                        targetbuffer,   // c->bitmaptrg,        // bitmap target (screen/dive)
                        w, h,           // f->width, f->height, // bitmap width, height (2copy)
                        xs/dsx, ys/dsy, // 0, 0,                // top, left source
                        xi, yi,         // 0, 0,                // top, left target
                        scanlinesize,   // fccColorEncoding,    // c->width,            // line size target
                        c->bDepth);

    //
    // and blit the image to the screen
    //
    rc = DiveBlitImage(c->hDiveInst, c->ulBuffer, DIVE_BUFFER_SCREEN);
    if (rc != DIVE_SUCCESS) {
        log_error(vidlog, "Call to DiveBlitImage failed, rc = 0x%x", rc);
        return;
    }

    //
    // It seems, that this must be _after_ DiveBlitImage!
    //
    rc = DiveEndImageBufferAccess(c->hDiveInst, c->ulBuffer);
    if (rc != DIVE_SUCCESS) {
        log_error(vidlog, "Call to DiveEndImageBufferAccess failed, rc = 0x%x", rc);
        return;
    }
#else
    {
        RECTL rectl = {
            c->divesetup.lScreenPosX,
            c->divesetup.lScreenPosY,
            c->divesetup.lScreenPosX + c->width,
            c->divesetup.lScreenPosY + c->height
        };
        rc = DiveAcquireFrameBuffer(c->hDiveInst, &rectl);
    }
    if (rc != DIVE_SUCCESS) {
        log_error(vidlog, "Call to DiveAcquireFrameBuffer failed, rc = 0x%x", rc);
        return;
    }

    if (c->divesetup.lScreenPosX + xi + w >= divecaps.ulHorizontalResolution) {
        w = divecaps.ulHorizontalResolution - (c->divesetup.lScreenPosX + xi);
    }

    if (c->divesetup.lScreenPosY + yi + h >= divecaps.ulVerticalResolution) {
        h = divecaps.ulVerticalResolution - (c->divesetup.lScreenPosY + yi);
    }

    video_canvas_render(c, c->pVram,
                        w, h,
                        xs/dsx, ys/dsy,
                        c->divesetup.lScreenPosX+xi,
                        c->divesetup.lScreenPosY+yi,
                        divecaps.ulScanLineBytes,
                        c->bDepth);

    rc = DiveDeacquireFrameBuffer(c->hDiveInst);
    if (rc != DIVE_SUCCESS) {
        log_error(vidlog, "Call to DiveDeacquireFrameBuffer failed, rc = 0x%x", rc);
        return;
    }
#endif
}

void WmPaint(HWND hwnd)
{
    canvas_refresh_t ref;

    //
    // get pointer to actual canvas from user data area
    //
    video_canvas_t *c = GetCanvas(hwnd);

    DEBUG("WM_PAINT 0");

    //
    // if the canvas isn't setup yet or we are in a different
    // mode than the present videomode return
    //
    if (!c || !FullscreenIsInMode()) {
        return;
    }

    DEBUG("WM_PAINT 1");

    //
    // Make sure that we are not in a conflict with the emulation
    // thread calling video_canvas_refresh (wmVrnEnabled)
    //
    if (DosRequestMutexSem(c->hmtx, SEM_IMMEDIATE_RETURN))
        return;
    //
    // get the frame_buffer and geometry from the machine
    //
    if (machine_canvas_async_refresh(&ref, c) >= 0)
    {
        DEBUG("WM_PAINT 2");

        //
        // enable the visible region - it is disabled
        //
        WmVrnEnabled(hwnd);

        DEBUG("WM_PAINT 3");

        //
        // blit to canvas (canvas_refresh should be thread safe by itself)
        //
        VideoCanvasBlit(c, ref.x, ref.y, 0, 0, c->width, c->height);
    }
    DosReleaseMutexSem(c->hmtx);

    DEBUG("WM_PAINT 4");
}

static int WmTranslateAccel(HWND hwnd, MPARAM mp1)
{
    QMSG *qmsg = (QMSG*)mp1;

    //
    // if key is pressed together with alt let the acceltable
    // process the pressed key
    //
    if (SHORT1FROMMP(qmsg->mp1) & KC_ALT) {
        return TRUE;
    }

    //
    // if the focus of the actual canvas (eg. F1 pressed in
    // open menu) isn't the actual focus let the acceltable
    // process the pressed key
    //
    if (hwnd != qmsg->hwnd) {
        return TRUE;
    }

    //
    // don't let the acceltable translate the key (eg. to get
    // F1 passed to WM_CHAR)
    //
    return FALSE;
}

#ifdef HAVE_MOUSE
static void DisplayPopupMenu(HWND hwnd, POINTS *pts)
{
    const video_canvas_t *c = GetCanvas(hwnd);

    WinPopupMenu(hwnd, hwnd, c->hwndPopupMenu, pts->x, pts->y, 0, PU_MOUSEBUTTON2DOWN | PU_HCONSTRAIN | PU_VCONSTRAIN);
}
#endif

MRESULT EXPENTRY CanvasWinProc(HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2)
{
    switch (msg) {
        //
        // --- Open / Close ---
        //
        case WM_CREATE:
            return WmCreate(hwnd);
        case WM_CLOSE:
            FullscreenDisable();
            WmDestroy(hwnd);
            break; /* return FALSE */
        //
        // --- Video / Paint ---
        //
        case WM_PAINT:
            WmPaint(hwnd);
            break;
        case WM_VRNDISABLED:
            WmVrnDisabled(hwnd);
            return FALSE;
        case WM_VRNENABLED:
            WmVrnEnabled(hwnd);
            return FALSE;
        //
        // --- Menubar ---
        //
        case WM_COMMAND:
            menu_action(hwnd, SHORT1FROMMP(mp1));
            return FALSE;
        case WM_MENUSELECT:
            menu_select(HWNDFROMMP(mp2), SHORT1FROMMP(mp1));
            return (MRESULT)TRUE; /* dismiss menu */
        //
        // --- Keyboard / Mouse ---
        //
        case WM_SETSELECTION:
            WmSetSelection(mp1);
            break;
        case DM_DRAGOVER:
        case DM_DROP:
            return DragDrop(hwnd, msg, mp1);
        case WM_TRANSLATEACCEL:
            if (WmTranslateAccel(hwnd, mp1)) {
                break;
            }
            return FALSE;
        case WM_CHAR:
            kbd_proc(hwnd, mp1, mp2);

            if ((SHORT1FROMMP(mp1) & (KC_ALT | KC_VIRTUALKEY | KC_KEYUP)) != (KC_ALT | KC_VIRTUALKEY | KC_KEYUP)) {
                break;
            }

            vsync_suspend_speed_eval();
            switch (SHORT2FROMMP(mp2)) {
                case VK_HOME:
                    FullscreenSwitch(hwnd);
                    break;
                case VK_PAGEUP:
                    FullscreenChangeRate(hwnd, 1);
                    break;
                case VK_PAGEDOWN:
                    FullscreenChangeRate(hwnd, -1);
                    break;
            }
            break;
        case WM_ACTIVATE:     // activation/deactivation of window
            if (!mp1) {       // Switching away from the application
                FullscreenDeactivate(hwnd);
            } else {          // Switching to the application
                FullscreenActivate(hwnd);
            }
            break;

#ifdef HAVE_MOUSE
        case WM_BUTTON2DOWN:
            if (!menu) {
                DisplayPopupMenu(hwnd, (POINTS*)&mp1);
                return FALSE;
            }
        // ** FALTHROUGH **
        case WM_MOUSEMOVE:
        case WM_BUTTON1DOWN:
        case WM_BUTTON1UP:
        case WM_BUTTON2UP:
            mouse_button(hwnd, msg, mp1);
            break;
#endif
    }
    return WinDefWindowProc(hwnd, msg, mp1, mp2);
}

static void InitHelp(HWND hwndFrame, int id, PSZ title, PSZ libname)
{
    HELPINIT hini;

    HWND hwndHelp;
    HAB hab = WinQueryAnchorBlock(hwndFrame);

    //
    // initialize help init structure
    //
    memset(&hini, 0, sizeof(hini));

    hini.cb = sizeof(HELPINIT);
    hini.phtHelpTable = (PHELPTABLE)MAKELONG(id, 0xFFFF);
    hini.pszHelpWindowTitle = (PSZ)title;
    hini.pszHelpLibraryName = (PSZ)libname;
#ifdef HLPDEBUG
    hini.fShowPanelId = CMIC_SHOW_PANEL_ID;
#else
    hini.fShowPanelId = CMIC_HIDE_PANEL_ID;
#endif

    //
    // creating help instance
    //
    hwndHelp = WinCreateHelpInstance(hab, &hini);

    if (!hwndHelp || hini.ulReturnCode) {
        log_error(vidlog, "WinCreateHelpInstance failed (rc=%d)", hini.ulReturnCode);
        return; // error
    }

    //
    // associate help instance with main frame
    //
    if (!WinAssociateHelpInstance(hwndHelp, hwndFrame)) {
        log_error(vidlog, "WinAssociateInstance failed.");
        return; // error
    }
}

extern int trigger_shutdown;

static void InitMenuBar(video_canvas_t *c)
{
    //
    // Load popup menu from resource file (this is attached to the frame)
    //
    c->hwndPopupMenu = WinLoadMenu(c->hwndFrame, NULLHANDLE, IDM_VICE2);

    //
    // detach it from the frame window
    //
    WinSetParent(c->hwndPopupMenu, HWND_OBJECT, FALSE);

    //
    // initialize handle to menubar
    //
    c->hwndMenu = WinWindowFromID(c->hwndFrame, FID_MENU);

    //
    // set visibility state of menubar to actual state
    // WM_UPDATEFRAME also hides the loaded popup menu
    // the size is also corrected
    //
    set_menu(menu, (void*)c->hwndClient);
}

void VideoBufferAlloc(video_canvas_t *c)
{
    ULONG rc;

    //
    // FIXME: bitmaptrg needs some additional lines!
    //
    c->bitmaptrg = (char*)calloc(c->height + 4, c->width * c->bDepth / 8);

    //
    // allocate image buffer, I might be faster to specify 0 for
    // the scanlinesize, but then we need a correction for
    // every time we have a line size which is not
    // devidable by 4
    //
    // if ulBuffer != 0 the call to DiveAllocImageBuffer fails
    //
    c->ulBuffer = 0;
    rc=DiveAllocImageBuffer(c->hDiveInst, &c->ulBuffer, c->divesetup.fccSrcColorFormat, c->width, c->height, 0, c->bitmaptrg);

    //
    // check for error oocursion
    //
    if (rc) {
        log_error(vidlog, "DiveAllocImageBuffer (rc=0x%x).", rc);
    } else {
        log_message(vidlog, "Dive buffer #%d allocated (%lix%li)", c->ulBuffer, c->width, c->height);
    }
}

/*
 Old exposure handler:
 ---------------------
 canvas->draw_buffer->canvas_width=width;
 canvas->draw_buffer->canvas_height=height;
 video_viewport_resize(canvas);
 */

struct canvas_init_s
{
    UINT width;
    UINT height;
    UINT stretch;
    char *title;
    video_canvas_t *canvas;
    video_render_config_t *videoconfig;
    draw_buffer_t *draw_buffer;
    viewport_t *viewport;
    geometry_t *geometry;
    palette_t *palette;
};

typedef struct canvas_init_s canvas_init_t;

void CanvasMainLoop(VOID *arg)
{
    APIRET rc;
    SWP swp;
    QMSG qmsg; // Msg Queue Event
    HWND hwndFrame;
    HWND hwndClient;

    video_canvas_t *c = (video_canvas_t*)arg;

    // archdep_setup_signals(0); // signals are not shared between threads!

    HAB hab = WinInitialize(0);            // Initialize Anchor to PM
    HMQ hmq = WinCreateMsgQueue(hab, 0);   // Create Msg Queue Handle

    //
    // 16 Byte Memory (Used eg for the Anchor Blocks)
    //  CS_MOVENOTI8FY, CS_SIZEREDRAW skipped
    //  CS_SYNCPAINT:       send WM_PAINT messages immediately
    //   don't send WM_PAINT befor canvas is resized
    //  CS_BYTEALIGNWINDOW: 0x2000
    //
    WinRegisterClass(hab, szClientClass, CanvasWinProc, CS_SYNCPAINT, 0x10);

    //
    // create window on desktop, FIXME: WS_ANIMATE looks sometimes strange
    //
    initcanvas = c;
    hwndFrame = WinCreateStdWindow(HWND_DESKTOP, WS_ANIMATE | WS_VISIBLE, &flFrameFlags, szClientClass, c->title, 0L, 0, IDM_VICE2, &hwndClient);
    if (!hwndFrame) {
        ERRORID id = WinGetLastError(hab);
        log_error(vidlog, "WinCreateStdWindow failed (WinGetLastError=0x%x)", id);
    }

    c = GetCanvas(hwndClient);
    if (!c) {
        initcanvas->initialized = 0;
        return;
    }

    c->hwndFrame  = hwndFrame;
    c->hwndClient = hwndClient;

    VideoBufferAlloc(c);

    //
    // Add to vice internal window list
    // (needed to handle the two windows of x128
    //
    AddToWindowList(hwndClient);

    //
    // get actual window size and position
    //
    WinQueryWindowPos(hwndFrame, &swp);

    //
    // initialize titlebare usage
    //
    c->hwndTitlebar = WinWindowFromID(hwndFrame, FID_TITLEBAR);

    //
    // initialize help system
    //
    InitHelp(hwndFrame, IDM_VICE2, "Vice/2 Help", "doc\\vice2.hlp");

    //
    // initialize menu bar
    //
    InitMenuBar(c);

    //
    // bring window to top, set size and position, set focus
    // correct for window height
    //
    WinSetWindowPos(hwndFrame, HWND_TOP, swp.x, swp.y + swp.cy-GetWindowHeight(c), 0, 0, SWP_SHOW | SWP_ZORDER | SWP_ACTIVATE | SWP_MOVE);

    //
    // set visible region notify on, enable visible region
    //
    WinSetVisibleRegionNotify(hwndClient, TRUE);
    WinSendMsg(hwndClient, WM_VRNENABLED, 0, 0);

    //
    // this makes reactions faster when shutdown of main thread is triggered
    //
    if (rc = DosSetPriority(PRTYS_THREAD, PRTYC_REGULAR, 1, 0)) {
        log_error(vidlog, "DosSetPriority (rc=%li)", rc);
    }

    log_message(vidlog, "'%s' completely initialized.", c->title);

    //
    // Now wake up the emulation thread by setting ini->canvas
    //
    c->initialized = 1;

    //
    // MAINLOOP
    // returns when a WM_QUIT Msg goes through the queue
    //
    while (WinGetMsg(hab, &qmsg, NULLHANDLE, 0, 0)) {
        WinDispatchMsg(hab, &qmsg);
    }

    //
    // make sure, that the state of the VRN doesn't change anymore,
    // don't blit anymore
    //

    // FIXME: The disabeling can be done in WM_CLOSE???
    // Doesn't seem to 'fast enough' ???
    WinSetVisibleRegionNotify(c->hwndClient, FALSE);
    WmVrnDisabled(c->hwndClient);

    log_message(vidlog, "Window '%s': Quit!", c->title);

    //
    // FIXME: For x128 this must be triggered before the Msg Queue is destroyed
    // because sometimes WinDestroyMsgQueue seems to hang. For the second
    // window the msg queue is never destroyed. Is it really necessary
    // to destroy the msg queue?
    //
    log_message(vidlog, "Triggering Shutdown of Emulation Thread.");
    trigger_shutdown = 1;

    log_message(vidlog, "Releasing PM.");

    if (!WinDestroyMsgQueue(hmq)) {
        log_error(vidlog, "Destroying Msg Queue.");
    }
    if (!WinTerminate (hab)) {
        log_error(vidlog, "Releasing PM anchor.");
    }

    log_message(vidlog, "PM released.");

    DosSleep(5000); // wait 5 seconds

    //
    // FIXME, this happens for x128 eg at my laptop when video_close is called
    //
    log_error(vidlog, "Brutal Exit!");

    //
    // if the triggered shutdown hangs make sure that the program ends
    //
    exit(0);        // end VICE in all cases
}

/* ------------------------------------------------------------------------ */
/* Canvas functions.  */
void video_arch_canvas_init(struct video_canvas_s *canvas)
{
    canvas->video_draw_buffer_callback = NULL;
}

/*
 Create a `video_canvas_t' with tile `win_name', of width `*width'
 and `*height'pixels and palette `palette'. If specified width/height
 is not possible, return an alternative in `*width' and `*height';
 return the pixel values for the requested palette in `pixel_return[]'.
*/
video_canvas_t *video_canvas_create(video_canvas_t *canvas, UINT *width, UINT *height, int mapped)
{
    log_message(vidlog, "Creation of '%s' (%ix%i) requested%s.", canvas->viewport->title, *width, *height, vsid_mode ? " (vsid mode)" : "");

    *strrchr(canvas->viewport->title, ' ') = 0; // FIXME?

    canvas->title = util_concat(szTitleBarText, " - ", canvas->viewport->title + 6, NULL);
    canvas->width = *width;
    canvas->height = *height;
    canvas->stretch = stretch;
    canvas->initialized = 2;

    if (canvas->videoconfig->doublesizex) {
        canvas->width *= 2;
    }

    if (canvas->videoconfig->doublesizey) {
        canvas->height *= 2;
    }

    _beginthread(CanvasMainLoop, NULL, 0x4000, canvas);

    //
    // Wait until the canvas as either created successfully or
    // the canvas creation failed
    //
    while (canvas->initialized == 2) {
        DosSleep(1);
    }

    //
    // If initialization of canvas failed
    // canvas_ini.canvas is set to -1
    //
    if (canvas == 0) {
        return NULL;
    }

    log_message(vidlog, "Canvas '%s' (%ix%i) created: hwnd=0x%x.", canvas->viewport->title, *width, *height, canvas->hwndClient);

    video_canvas_set_palette(canvas, canvas->palette);

    return canvas;
}

void video_canvas_destroy(video_canvas_t *c)
{
    ULONG rc;

    //
    // Save values needed later
    //
    HMTX hmtx = c->hmtx;
    HDIVE hdive = c->hDiveInst;

    //
    // This stops WM_PAINT
    //
    WinSetWindowPtr(c->hwndClient, QWL_USER, NULL);

    //
    // Set sending of WM_VRN* messages
    //
    WinSetVisibleRegionNotify(c->hwndClient, FALSE);

    //
    // Disable blitter (not really needed)
    //
    c->vrenabled = FALSE;

    DiveSetupBlitter(hdive, NULL);

    //
    // Free video buffer (needs c->hDiveInst)
    //
    VideoBufferFree(c);

    //
    // makes sure, that no WM_VRN* messages and canvas_refresh is
    // processed anymore. Not really needed: for convinience
    //
    c->hDiveInst = 0;

    //
    // No close the dive instance of this canvas
    //
    if (rc = DiveClose(hdive)) {
        log_error(vidlog, "Closing Dive instance #%d (DiveClose, rc=0x%x)", hdive, rc);
    } else {
        log_message(vidlog, "Dive instance #%d successfully closed.", hdive);
    }

    //
    // Free the rectangles used for blitting
    //
    lib_free(c->divesetup.pVisDstRects);

    log_message(vidlog, "Destroying data structure for '%s'.", c->title);

    //
    // Free title and canvas structure
    //
    lib_free(c->title);
    video_canvas_shutdown(c);

    //
    // Close Mutex Semaphore
    //
    DosCloseMutexSem(hmtx);
}

void video_canvas_resize(video_canvas_t *c, UINT wnew, UINT hnew)
{
    //
    // if this function is called from the outside of
    // the emulation thread make sure that it is enclosed in
    // a mutex semaphore to avoid conflicts between
    // dive_alloc/free and video_canvas_refresh
    //
    SWP swp;

    UINT wold = c->width;
    UINT hold = c->height;
    UINT sold = c->stretch;

    if (c->videoconfig->doublesizex) {
        wnew *= 2;
    }

    if (c->videoconfig->doublesizey) {
        hnew *= 2;
    }

    //
    // if nothing has changed do nothing
    //
    if (wold == wnew && hold == hnew && sold == stretch) {
        return;
    }

    //
    // Disable all drawing into window, we can change either
    // the stretching factor (the function which does it disables
    // drawing) or the canvas size (this is done by the emulation
    // thread which means that at the same time no drawing will happen)
    //
    WinSetVisibleRegionNotify(c->hwndClient, FALSE); // turn VRN off
    WmVrnDisabled(c->hwndClient);

    //
    // resize canvas description
    //
    // Do it before. WM_PAINT, called from WinSetWindowPos, needs it.
    //
    c->stretch = stretch;

    //
    // resize the buffer from which we blit to the window, too
    //
    if (wold != wnew || hold != hnew) {
        c->width  = wnew;
        c->height = hnew;

        VideoBufferFree(c);
        VideoBufferAlloc(c);
    }

    //
    // make anchor left, top corner and resize window physically
    //
    WinQueryWindowPos(c->hwndFrame, &swp);
    if (!WinSetWindowPos(c->hwndFrame, 0, swp.x, swp.y + swp.cy - GetWindowHeight(c), GetWindowWidth(c), GetWindowHeight(c), SWP_SIZE | SWP_MOVE)) {
        log_error(vidlog, "Resizing canvas to %ix%i * %d.", wnew, hnew, stretch);

        c->stretch = sold;

        if (wold != wnew || hold != hnew) {
            c->width = wold;
            c->height = hold;

            VideoBufferFree(c);
            VideoBufferAlloc(c);
        }

        return;
    }

    if (FullscreenIsNow()) {
        vsync_suspend_speed_eval();
        FullscreenChangeMode(c->hwndClient);
    }

    //
    // reenable drawing into window (call exposure_handler, too)
    // this calls also the exposure handler
    //
    WmVrnEnabled(c->hwndClient);
    WinSetVisibleRegionNotify(c->hwndClient, TRUE); // turn VRN on

    log_message(vidlog, "Canvas resized (%ix%i * %i --> %ix%i * %i)", wold, hold, sold, wnew, hnew, stretch);
}

void VideoConvertPalette8(video_canvas_t *c, int num)
{
    int i;

    for (i = 0; i < num; i++) {
        video_render_setphysicalcolor(c->videoconfig, i, i, 8);
    }
}

void VideoConvertPalette(video_canvas_t *c, int num, palette_entry_t *src)
{
    ULONG rc;
    ULONG ulTrg = 0;
    ULONG ulSrc = 0;
    FOURCC fccSrc = FOURCC_RGB3;
    char target[0x400]; // max: 256*4b
    char source[0x400]; // max: 256*4b
    HDIVE inst = 0;
    SETUP_BLITTER setup;

    if (num > 0x100) {
        log_error(vidlog, "VideoConvertPalette - More than 256 (%d) palette entries requested.", num);
        return;
    }

    // As DIVE does not support conversion between RGB and BGR formats,
    // we have to match the source FCC with the desktop FCC
    if ((c->divesetup.fccSrcColorFormat == FOURCC_BGR3) || (c->divesetup.fccSrcColorFormat == FOURCC_BGR4)) {
        fccSrc = FOURCC_BGR3;
    }

    memset(&setup, 0, sizeof(SETUP_BLITTER));

    setup.ulStructLen = sizeof(SETUP_BLITTER);
    setup.pVisDstRects = calloc(1, sizeof(RECTL));
    setup.fccSrcColorFormat = fccSrc;
    setup.fccDstColorFormat = c->divesetup.fccSrcColorFormat;
    setup.ulSrcHeight = 1;
    setup.ulDstHeight = 1;
    setup.ulNumDstRects = 1;
    setup.pVisDstRects->yTop = 1;
    setup.pVisDstRects->xRight = num;
    setup.ulSrcWidth = num;
    setup.ulDstWidth = num;

    rc = DiveOpen(&inst, TRUE, NULL);
    if (rc) {
        log_error(vidlog, "VideoConvertPalette - DiveOpen failed, rc=0x%x", rc);
        return;
    }

    rc = DiveAllocImageBuffer(inst, &ulSrc, fccSrc, num, 1, 0, source);
    if (rc) {
        log_error(vidlog, "VideoConvertPalette - DiveAllocImageBuffer (src) failed, rc=0x%x", rc);
    } else {
        rc = DiveAllocImageBuffer(inst, &ulTrg, c->divesetup.fccSrcColorFormat, num, 1, 0, target);
        if (rc) {
            log_error(vidlog, "VideoConvertPalette - DiveAllocImageBuffer (trg) failed, rc=0x%x", rc);
        } else {
            int i;

            if (fccSrc == FOURCC_RGB3) {
                for (i = 0; i < num; i++) {
                    source[i * 3] = src[i].red;
                    source[i * 3 + 1] = src[i].green;
                    source[i * 3 + 2] = src[i].blue;
                }
            } else {
                for (i = 0; i < num; i++) {
                    source[i * 3] = src[i].blue;
                    source[i * 3 + 1] = src[i].green;
                    source[i * 3 + 2] = src[i].red;
                }
            }

            rc = DiveSetupBlitter(inst, &setup);
            if (rc) {
                log_error(vidlog, "VideoConvertPalette - DiveSetupBlitter failed, rc=0x%x", rc);
            } else {
                int bytes = c->bDepth / 8;

                rc = DiveBlitImage(inst, ulSrc, ulTrg);
                if (rc) {
                    log_error(vidlog, "VideoConvertPalette - DiveBlitImage failed, rc=0x%x", rc);
                } else {
                    int i;

                    for (i = 0; i < num; i++) {
                        int b;
                        DWORD color = 0;

                        for (b = 0; b < bytes; b++) {
                            color |= (ULONG)target[i * bytes + b] << (b * 8);
                        }

                        video_render_setphysicalcolor(c->videoconfig, i, color, c->bDepth);
                    }
                }
            }

            rc = DiveFreeImageBuffer(inst, ulTrg);
            if (rc) {
                log_error(vidlog, "VideoConvertPalette - DiveFreeImageBuffer (trg) failed, rc=0x%x", rc);
            }
            lib_free(setup.pVisDstRects);
        }

        rc = DiveFreeImageBuffer(inst, ulSrc);
        if (rc) {
            log_error(vidlog, "VideoConvertPalette - DiveFreeImageBuffer (src) failed, rc=0x%x", rc);
        }
    }

    rc = DiveClose(inst);
    if (rc) {
        log_error(vidlog, "VideoConvertPalette - DiveClose failed, rc=0x%x", rc);
    }
}

/* Set the palette of `c' to `p'.  */
int video_canvas_set_palette(video_canvas_t *c, palette_t *p)
{
    int i;

    if (c->bDepth != 8) {
        VideoConvertPalette(c, p->num_entries, p->entries);
        WmPaint(c->hwndClient);
    } else {
        ULONG rc;

        //
        // number of already used blocks of color data
        //
        RGB2 *palette = calloc(p->num_entries, sizeof(RGB2));

        /*
         log_debug("Setting %d pallette entries, ret=0x%p.", p->num_entries,
         pixel_return);
         */

        for (i = 0; i < p->num_entries; i++)
        {
            palette[i].bRed = p->entries[i].red;
            palette[i].bGreen = p->entries[i].green;
            palette[i].bBlue = p->entries[i].blue;
        }

        rc = DiveSetSourcePalette(c->hDiveInst, 0, p->num_entries, (BYTE*)palette);

        if (rc) {
            log_error(vidlog, "DiveSetSourcePalette (rc=0x%x).",rc);
        } else {
            log_message(vidlog, "%d palette entries realized.", p->num_entries);
        }

        lib_free(palette);

        VideoConvertPalette8(c, p->num_entries);
    }

    return 0;
}

/* ------------------------------------------------------------------------ */
void video_canvas_refresh(video_canvas_t *c, unsigned int xs, unsigned int ys, unsigned int xi, unsigned int yi, unsigned int w, unsigned int h)
{
    if (!c->hDiveInst) {
        return;
    }

    if (DosRequestMutexSem(c->hmtx, SEM_INDEFINITE_WAIT)) {
        return;
    }

    DEBUG("CANVAS REFRESH 0");

    //
    // I tried to call DiveSetupBlitter onyl if the values
    // changed, but it doesn't speed up anything
    //
    if (c->vrenabled) {
        if (c->videoconfig->doublesizex) {
            xs *= 2;
            xi *= 2;
            w *= 2;
        }

        if (c->videoconfig->doublesizey) {
            ys *= 2;
            yi *= 2;
            h *= 2;
        }
        VideoCanvasBlit(c, xs, ys, xi, yi, w, h);
    }

    DosReleaseMutexSem(c->hmtx);

    DEBUG("CANVAS REFRESH 1");
};

void fullscreen_capability(cap_fullscreen_t *cap_fullscreen)
{
    cap_fullscreen->device_num = 0;
}
