/*

	SDL - Simple DirectMedia Layer

	Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

	This library is free software; you can redistribute it and/or

	modify it under the terms of the GNU Library General Public

	License as published by the Free Software Foundation; either

	version 2 of the License, or (at your option) any later version.

	This library 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

	Library General Public License for more details.

	You should have received a copy of the GNU Library General Public

	License along with this library; if not, write to the Free

	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	Sam Lantinga

	slouken@libsdl.org

*/

#ifdef SAVE_RCSID

static char rcsid =

 "@(#) $Id$";

#endif

/* DirectFB video driver implementation.

*/

#include <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <fcntl.h>

#include <unistd.h>

#include <sys/mman.h>

#include <directfb.h>

#include "SDL.h"

#include "SDL_error.h"

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "SDL_sysvideo.h"

#include "SDL_pixels_c.h"

#include "SDL_events_c.h"

#include "SDL_DirectFB_video.h"

#include "SDL_DirectFB_events.h"

/* Initialization/Query functions */

static int DirectFB_VideoInit(_THIS, SDL_PixelFormat *vformat);

static SDL_Rect **DirectFB_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);

static SDL_Surface *DirectFB_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);

static int DirectFB_SetColors(_THIS, int firstcolor, int ncolors,

			 SDL_Color *colors);

static void DirectFB_VideoQuit(_THIS);

/* Hardware surface functions */

static int DirectFB_AllocHWSurface(_THIS, SDL_Surface *surface);

static int DirectFB_FillHWRect(_THIS, SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color);

static int DirectFB_LockHWSurface(_THIS, SDL_Surface *surface);

static void DirectFB_UnlockHWSurface(_THIS, SDL_Surface *surface);

static void DirectFB_FreeHWSurface(_THIS, SDL_Surface *surface);

static int DirectFB_CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst);

static int DirectFB_HWAccelBlit(SDL_Surface *src, SDL_Rect *srcrect,

                                SDL_Surface *dst, SDL_Rect *dstrect);

static int DirectFB_SetHWColorKey(_THIS, SDL_Surface *surface, Uint32 key);

static int DirectFB_SetHWAlpha(_THIS, SDL_Surface *surface, Uint8 alpha);

static int DirectFB_FlipHWSurface(_THIS, SDL_Surface *surface);

/* Various screen update functions available */

static void DirectFB_DirectUpdate(_THIS, int numrects, SDL_Rect *rects);

static void DirectFB_WindowedUpdate(_THIS, int numrects, SDL_Rect *rects);

/* This is the rect EnumModes2 uses */

struct DirectFBEnumRect {

	SDL_Rect r;

	struct DirectFBEnumRect* next;

};

static struct DirectFBEnumRect *enumlist = NULL;

/* DirectFB driver bootstrap functions */

static int DirectFB_Available(void)

{

  return 1;

}

static void DirectFB_DeleteDevice(SDL_VideoDevice *device)

{

  free(device->hidden);

  free(device);

}

static SDL_VideoDevice *DirectFB_CreateDevice(int devindex)

{

  SDL_VideoDevice *device;

  /* Initialize all variables that we clean on shutdown */

  device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));

  if (device)

    {

      memset (device, 0, (sizeof *device));

      device->hidden = (struct SDL_PrivateVideoData *) malloc (sizeof (*device->hidden));

    }

  if (device == NULL  ||  device->hidden == NULL)

    {

      SDL_OutOfMemory();

      if (device)

        {

          free (device);

        }

      return(0);

    }

  memset (device->hidden, 0, sizeof (*device->hidden));

  /* Set the function pointers */

  device->VideoInit = DirectFB_VideoInit;

  device->ListModes = DirectFB_ListModes;

  device->SetVideoMode = DirectFB_SetVideoMode;

  device->SetColors = DirectFB_SetColors;

  device->UpdateRects = NULL;

  device->VideoQuit = DirectFB_VideoQuit;

  device->AllocHWSurface = DirectFB_AllocHWSurface;

  device->CheckHWBlit = DirectFB_CheckHWBlit;

  device->FillHWRect = DirectFB_FillHWRect;

  device->SetHWColorKey = DirectFB_SetHWColorKey;

  device->SetHWAlpha = DirectFB_SetHWAlpha;

  device->LockHWSurface = DirectFB_LockHWSurface;

  device->UnlockHWSurface = DirectFB_UnlockHWSurface;

  device->FlipHWSurface = DirectFB_FlipHWSurface;

  device->FreeHWSurface = DirectFB_FreeHWSurface;

  device->SetCaption = NULL;

  device->SetIcon = NULL;

  device->IconifyWindow = NULL;

  device->GrabInput = NULL;

  device->GetWMInfo = NULL;

  device->InitOSKeymap = DirectFB_InitOSKeymap;

  device->PumpEvents = DirectFB_PumpEvents;

  device->free = DirectFB_DeleteDevice;

  return device;

}

VideoBootStrap DirectFB_bootstrap = {

  "directfb", "DirectFB",

  DirectFB_Available, DirectFB_CreateDevice

};

static DFBSurfacePixelFormat GetFormatForBpp (int bpp, IDirectFBDisplayLayer *layer)

{

  DFBDisplayLayerConfig dlc;

  int                   bytes = (bpp + 7) / 8;

  layer->GetConfiguration (layer, &dlc);

  if (bytes == DFB_BYTES_PER_PIXEL(dlc.pixelformat))

    return dlc.pixelformat;

  switch (bytes)

    {

    case 1:

      return DSPF_RGB332;

    case 2:

      return DSPF_RGB16;

    case 3:

      return DSPF_RGB24;

    case 4:

      return DSPF_RGB32;

    }

  return DSPF_UNKNOWN;

}

static DFBEnumerationResult EnumModesCallback (unsigned int  width,

                                               unsigned int  height,

                                               unsigned int  bpp,

                                               void         *data)

{

  SDL_VideoDevice *this = (SDL_VideoDevice *)data;

  struct DirectFBEnumRect *enumrect;

  HIDDEN->nummodes++;

  enumrect = calloc(1, sizeof(struct DirectFBEnumRect));

  if (!enumrect)

    {

      SDL_OutOfMemory();

      return DFENUM_CANCEL;

    }

  enumrect->r.w  = width;

  enumrect->r.h  = height;

  enumrect->next = enumlist;

  enumlist = enumrect;

  return DFENUM_OK;

}

struct private_hwdata {

  IDirectFBSurface *surface;

};

void SetDirectFBerror (const char *function, DFBResult code)

{

  const char *error = DirectFBErrorString (code);

  if (error)

    SDL_SetError("%s: %s", function, error);

  else

    SDL_SetError("Unknown error code from %s", function);

}

static DFBSurfacePixelFormat SDLToDFBPixelFormat (SDL_PixelFormat *format)

{

  if (format->Rmask && format->Gmask && format->Bmask)

    {

      switch (format->BitsPerPixel)

        {

        case 16:

          if (format->Rmask == 0xF800 &&

              format->Gmask == 0x07E0 &&

              format->Bmask == 0x001F)

            return DSPF_RGB16;

          /* fall through */

        case 15:

          if (format->Rmask == 0x7C00 &&

              format->Gmask == 0x03E0 &&

              format->Bmask == 0x001F)

            return DSPF_RGB15;

          break;

        case 8:

          if (format->Rmask == 0xE0 &&

              format->Gmask == 0x1C &&

              format->Bmask == 0x03)

            return DSPF_RGB332;

          break;

        case 24:

          if (format->Rmask == 0xFF0000 &&

              format->Gmask == 0x00FF00 &&

              format->Bmask == 0x0000FF)

            return DSPF_RGB24;

          break;

        case 32:

          if (format->Rmask == 0xFF0000 &&

              format->Gmask == 0x00FF00 &&

              format->Bmask == 0x0000FF)

            {

              if (format->Amask == 0xFF000000)

                return DSPF_ARGB;

              else

                return DSPF_RGB32;

            }

          break;

        }

    }

  else

    {

      switch (format->BitsPerPixel)

	{

        case 8:

          return DSPF_RGB332;

	case 15:

	  return DSPF_RGB15;

	case 16:

	  return DSPF_RGB16;

	case 24:

	  return DSPF_RGB24;

	case 32:

	  return DSPF_RGB32;

	}

    }

  return DSPF_UNKNOWN;

}

static const __u8 lookup3to8[] = { 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff };

static const __u8 lookup2to8[] = { 0x00, 0x55, 0xaa, 0xff };

static SDL_Palette *GenerateRGB332Palette()

{

  int          i;

  SDL_Palette *palette;

  SDL_Color   *colors;

  palette = calloc (1, sizeof(SDL_Palette));

  if (!palette)

    {

      SDL_OutOfMemory();

      return NULL;

    }

  colors = calloc (256, sizeof(SDL_Color));

  if (!colors)

    {

      SDL_OutOfMemory();

      return NULL;

    }

  for (i=0; i<256; i++)

    {

      colors[i].r = lookup3to8[ i >> 5 ];

      colors[i].g = lookup3to8[ (i >> 2) & 7 ];

      colors[i].g = lookup2to8[ i & 3 ];

    }

  palette->ncolors = 256;

  palette->colors  = colors;

  return palette;

}

static int DFBToSDLPixelFormat (DFBSurfacePixelFormat pixelformat, SDL_PixelFormat *format)

{

  format->Amask = format->Rmask = format->Gmask = format->Bmask = 0;

  format->BitsPerPixel = format->BytesPerPixel = 0;

  switch (pixelformat)

    {

    case DSPF_A8:

      format->Amask = 0x000000FF;

      break;

    case DSPF_RGB15:

      format->Rmask = 0x00007C00;

      format->Gmask = 0x000003E0;

      format->Bmask = 0x0000001F;

      break;

    case DSPF_RGB16:

      format->Rmask = 0x0000F800;

      format->Gmask = 0x000007E0;

      format->Bmask = 0x0000001F;

      break;

    case DSPF_ARGB:

      format->Amask = 0; /* apps don't seem to like that:  0xFF000000; */

      /* fall through */

    case DSPF_RGB24:

    case DSPF_RGB32:

      format->Rmask = 0x00FF0000;

      format->Gmask = 0x0000FF00;

      format->Bmask = 0x000000FF;

      break;

    case DSPF_RGB332:

      format->Rmask = 0x000000E0;

      format->Gmask = 0x0000001C;

      format->Bmask = 0x00000003;

      format->palette = GenerateRGB332Palette();

      break;

    default:

      return -1;

    }

  format->BitsPerPixel  = DFB_BYTES_PER_PIXEL(pixelformat) * 8;

  format->BytesPerPixel = DFB_BYTES_PER_PIXEL(pixelformat);

  return 0;

}

int DirectFB_VideoInit(_THIS, SDL_PixelFormat *vformat)

{

  int                      i;

  DFBResult                ret;

  DFBCardCapabilities      caps;

  DFBDisplayLayerConfig    dlc;

  DFBSurfacePixelFormat    format;

  struct DirectFBEnumRect *rect;

  IDirectFB               *dfb    = NULL;

  IDirectFBDisplayLayer   *layer  = NULL;

  IDirectFBEventBuffer    *events = NULL;

  ret = DirectFBInit (NULL, NULL);

  if (ret)

    {

      SetDirectFBerror ("DirectFBInit", ret);

      goto error;

    }

  ret = DirectFBCreate (&dfb);

  if (ret)

    {

      SetDirectFBerror ("DirectFBCreate", ret);

      goto error;

    }

  ret = dfb->GetDisplayLayer (dfb, DLID_PRIMARY, &layer);

  if (ret)

    {

      SetDirectFBerror ("dfb->GetDisplayLayer", ret);

      goto error;

    }

  ret = dfb->CreateEventBuffer (dfb, DICAPS_ALL, &events);

  if (ret)

    {

      SetDirectFBerror ("dfb->CreateEventBuffer", ret);

      goto error;

    }

  layer->EnableCursor (layer, 1);

  /* Query layer configuration to determine the current mode and pixelformat */

  layer->GetConfiguration (layer, &dlc);

  /* FIXME: Returning RGB332 as the default mode doesn't work (everything is black) */

  if ((format = dlc.pixelformat) == DSPF_RGB332)

    format = DSPF_RGB16;

  if (DFBToSDLPixelFormat (format, vformat))

    {

      SDL_SetError ("Unsupported pixelformat");

      goto error;

    }

  /* Enumerate the available fullscreen modes */

  ret = dfb->EnumVideoModes (dfb, EnumModesCallback, this);

  if (ret)

    {

      SetDirectFBerror ("dfb->EnumVideoModes", ret);

      goto error;

    }

  HIDDEN->modelist = calloc (HIDDEN->nummodes + 1, sizeof(SDL_Rect *));

  if (!HIDDEN->modelist)

    {

      SDL_OutOfMemory();

      goto error;

    }

  for (i = 0, rect = enumlist; rect; ++i, rect = rect->next )

    {

      HIDDEN->modelist[i] = &rect->r;

    }

  HIDDEN->modelist[i] = NULL;

  /* Query card capabilities to get the video memory size */

  dfb->GetCardCapabilities (dfb, &caps);

  this->info.wm_available = 1;

  this->info.hw_available = 1;

  this->info.blit_hw      = 1;

  this->info.blit_hw_CC   = 1;

  this->info.blit_hw_A    = 1;

  this->info.blit_fill    = 1;

  this->info.video_mem    = caps.video_memory / 1024;

  HIDDEN->initialized = 1;

  HIDDEN->dfb         = dfb;

  HIDDEN->layer       = layer;

  HIDDEN->eventbuffer = events;

  return 0;

 error:

  if (events)

    events->Release (events);

  if (layer)

    layer->Release (layer);

  if (dfb)

    dfb->Release (dfb);

  return -1;

}

static SDL_Rect **DirectFB_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

{

  if (flags & SDL_FULLSCREEN)

    return HIDDEN->modelist;

  else

    if (SDLToDFBPixelFormat (format) != DSPF_UNKNOWN)

      return (SDL_Rect**) -1;

  return NULL;

}

static SDL_Surface *DirectFB_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags)

{

  DFBResult             ret;

  DFBSurfaceDescription dsc;

  DFBSurfacePixelFormat pixelformat;

  fprintf (stderr, "SDL DirectFB_SetVideoMode: %dx%d@%d, flags: 0x%08x\n",

           width, height, bpp, flags);

  flags |= SDL_FULLSCREEN;

  /* Release previous primary surface */

  if (current->hwdata && current->hwdata->surface)

    {

      current->hwdata->surface->Release (current->hwdata->surface);

      current->hwdata->surface = NULL;

    }

  else if (!current->hwdata)

    {

      /* Allocate the hardware acceleration data */

      current->hwdata = (struct private_hwdata *) calloc (1, sizeof(*current->hwdata));

      if (!current->hwdata)

        {

          SDL_OutOfMemory();

          return NULL;

	}

    }

  /* Set cooperative level depending on flag SDL_FULLSCREEN */

  if (flags & SDL_FULLSCREEN)

    {

      ret = HIDDEN->dfb->SetCooperativeLevel (HIDDEN->dfb, DFSCL_FULLSCREEN);

      if (ret)

        {

          DirectFBError ("dfb->SetCooperativeLevel", ret);

          flags &= ~SDL_FULLSCREEN;

        }

    }

  else

    HIDDEN->dfb->SetCooperativeLevel (HIDDEN->dfb, DFSCL_NORMAL);

  /* Set video mode */

  ret = HIDDEN->dfb->SetVideoMode (HIDDEN->dfb, width, height, bpp);

  if (ret)

    {

      if (flags & SDL_FULLSCREEN)

        {

          flags &= ~SDL_FULLSCREEN;

          HIDDEN->dfb->SetCooperativeLevel (HIDDEN->dfb, DFSCL_NORMAL);

          ret = HIDDEN->dfb->SetVideoMode (HIDDEN->dfb, width, height, bpp);

        }

      if (ret)

        {

          SetDirectFBerror ("dfb->SetVideoMode", ret);

          return NULL;

        }

    }

  /* Create primary surface */

  dsc.flags       = DSDESC_CAPS | DSDESC_PIXELFORMAT;

  dsc.caps        = DSCAPS_PRIMARY | ((flags & SDL_DOUBLEBUF) ? DSCAPS_FLIPPING : 0);

  dsc.pixelformat = GetFormatForBpp (bpp, HIDDEN->layer);

  ret = HIDDEN->dfb->CreateSurface (HIDDEN->dfb, &dsc, &current->hwdata->surface);

  if (ret && (flags & SDL_DOUBLEBUF))

    {

      /* Try without double buffering */

      dsc.caps &= ~DSCAPS_FLIPPING;

      ret = HIDDEN->dfb->CreateSurface (HIDDEN->dfb, &dsc, &current->hwdata->surface);

    }

  if (ret)

    {

      SetDirectFBerror ("dfb->CreateSurface", ret);

      current->hwdata->surface = NULL;

      return NULL;

    }

  current->w     = width;

  current->h     = height;

  current->flags = SDL_HWSURFACE | SDL_PREALLOC;

  if (flags & SDL_FULLSCREEN)

    {

      current->flags |= SDL_FULLSCREEN;

      this->UpdateRects = DirectFB_DirectUpdate;

    }

  else

    this->UpdateRects = DirectFB_WindowedUpdate;

  if (dsc.caps & DSCAPS_FLIPPING)

    current->flags |= SDL_DOUBLEBUF;

  current->hwdata->surface->GetPixelFormat (current->hwdata->surface, &pixelformat);

  DFBToSDLPixelFormat (pixelformat, current->format);

  return current;

}

static int DirectFB_AllocHWSurface(_THIS, SDL_Surface *surface)

{

  DFBResult             ret;

  DFBSurfaceDescription dsc;

  /*  fprintf(stderr, "SDL: DirectFB_AllocHWSurface (%dx%d@%d, flags: 0x%08x)\n",

      surface->w, surface->h, surface->format->BitsPerPixel, surface->flags);*/

  if (surface->w < 8 || surface->h < 8)

    return -1;

  /* fill surface description */

  dsc.flags  = DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT | DSDESC_CAPS;

  dsc.width  = surface->w;

  dsc.height = surface->h;

  dsc.caps   = (surface->flags & SDL_DOUBLEBUF) ? DSCAPS_FLIPPING : 0;

  /* find the right pixelformat */

  dsc.pixelformat = SDLToDFBPixelFormat (surface->format);

  if (dsc.pixelformat == DSPF_UNKNOWN)

    return -1;

  /* Allocate the hardware acceleration data */

  surface->hwdata = (struct private_hwdata *) calloc (1, sizeof(*surface->hwdata));

  if (surface->hwdata == NULL)

    {

      SDL_OutOfMemory();

      return -1;

    }

  /* Create the surface */

  ret = HIDDEN->dfb->CreateSurface (HIDDEN->dfb, &dsc, &surface->hwdata->surface);

  if (ret)

    {

      SetDirectFBerror ("dfb->CreateSurface", ret);

      free (surface->hwdata);

      surface->hwdata = NULL;

      return -1;

    }

  surface->flags |= SDL_HWSURFACE | SDL_PREALLOC;

  return 0;

}

static void DirectFB_FreeHWSurface(_THIS, SDL_Surface *surface)

{

  if (surface->hwdata && HIDDEN->initialized)

    {

      surface->hwdata->surface->Release (surface->hwdata->surface);

      free (surface->hwdata);

      surface->hwdata = NULL;

    }

}

static int DirectFB_CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst)

{

  /*  fprintf(stderr, "SDL: DirectFB_CheckHWBlit (src->hwdata: %p, dst->hwdata: %p)\n",

      src->hwdata, dst->hwdata);*/

  if (!src->hwdata || !dst->hwdata)

    return 0;

  src->flags |= SDL_HWACCEL;

  src->map->hw_blit = DirectFB_HWAccelBlit;

  return 1;

}

static int DirectFB_HWAccelBlit(SDL_Surface *src, SDL_Rect *srcrect,

                                SDL_Surface *dst, SDL_Rect *dstrect)

{

  DFBSurfaceBlittingFlags flags = DSBLIT_NOFX;

  DFBRectangle sr = { srcrect->x, srcrect->y, srcrect->w, srcrect->h };

  DFBRectangle dr = { dstrect->x, dstrect->y, dstrect->w, dstrect->h };

  IDirectFBSurface *surface = dst->hwdata->surface;

  if (src->flags & SDL_SRCCOLORKEY)

    {

      flags |= DSBLIT_SRC_COLORKEY;

      DirectFB_SetHWColorKey (NULL, src, src->format->colorkey);

    }

  if (src->flags & SDL_SRCALPHA)

    {

      flags |= DSBLIT_BLEND_COLORALPHA;

      surface->SetColor (surface, 0xff, 0xff, 0xff, src->format->alpha);

    }

  surface->SetBlittingFlags (surface, flags);

  if (sr.w == dr.w && sr.h == dr.h)

    surface->Blit (surface, src->hwdata->surface, &sr, dr.x, dr.y);

  else

    surface->StretchBlit (surface, src->hwdata->surface, &sr, &dr);

  return 0;

}

static int DirectFB_FillHWRect(_THIS, SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)

{

  SDL_PixelFormat  *fmt     = dst->format;

  IDirectFBSurface *surface = dst->hwdata->surface;

  /* ugly */

  surface->SetColor (surface,

                     (color & fmt->Rmask) >> (fmt->Rshift - fmt->Rloss),

                     (color & fmt->Gmask) >> (fmt->Gshift - fmt->Gloss),

                     (color & fmt->Bmask) << (fmt->Bloss - fmt->Bshift), 0xFF);

  surface->FillRectangle (surface, dstrect->x, dstrect->y, dstrect->w, dstrect->h);

  return 0;

}

static int DirectFB_SetHWColorKey(_THIS, SDL_Surface *src, Uint32 key)

{

  SDL_PixelFormat  *fmt     = src->format;

  IDirectFBSurface *surface = src->hwdata->surface;

  /* ugly */

  surface->SetSrcColorKey (surface,

                           (key & fmt->Rmask) >> (fmt->Rshift - fmt->Rloss),

                           (key & fmt->Gmask) >> (fmt->Gshift - fmt->Gloss),

                           (key & fmt->Bmask) << (fmt->Bloss - fmt->Bshift));

  return 0;

}

static int DirectFB_SetHWAlpha(_THIS, SDL_Surface *surface, Uint8 alpha)

{

  return 0;

}

static int DirectFB_FlipHWSurface(_THIS, SDL_Surface *surface)

{

  return surface->hwdata->surface->Flip (surface->hwdata->surface, NULL, DSFLIP_WAITFORSYNC);

}

static int DirectFB_LockHWSurface(_THIS, SDL_Surface *surface)

{

  DFBResult  ret;

  void      *data;

  int        pitch;

  ret = surface->hwdata->surface->Lock (surface->hwdata->surface,

                                        DSLF_WRITE, &data, &pitch);

  if (ret)

    {

      SetDirectFBerror ("surface->Lock", ret);

      return -1;

    }

  surface->pixels = data;

  surface->pitch  = pitch;

  return 0;

}

static void DirectFB_UnlockHWSurface(_THIS, SDL_Surface *surface)

{

  surface->hwdata->surface->Unlock (surface->hwdata->surface);

  surface->pixels = NULL;

}

static void DirectFB_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)

{

}

static void DirectFB_WindowedUpdate(_THIS, int numrects, SDL_Rect *rects)

{

  DFBRegion         region;

  int               i;

  int               region_valid = 0;

  IDirectFBSurface *surface = this->screen->hwdata->surface;

  for (i=0; i<numrects; ++i)

    {

      int x2, y2;

      if ( ! rects[i].w ) /* Clipped? */

        continue;

      x2 = rects[i].x + rects[i].w - 1;

      y2 = rects[i].y + rects[i].h - 1;

      if (region_valid)

        {

          if (rects[i].x < region.x1)

            region.x1 = rects[i].x;

          if (rects[i].y < region.y1)

            region.y1 = rects[i].y;

          if (x2 > region.x2)

            region.x2 = x2;

          if (y2 > region.y2)

            region.y2 = y2;

        }

      else

        {

            region.x1 = rects[i].x;

            region.y1 = rects[i].y;

            region.x2 = x2;

            region.y2 = y2;

            region_valid = 1;

        }

    }

  if (region_valid)

    surface->Flip (surface, &region, DSFLIP_WAITFORSYNC);

}

int DirectFB_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)

{

  fprintf(stderr, "SDL: Unimplemented DirectFB_SetColors!\n");

  return -1;

}

void DirectFB_VideoQuit(_THIS)

{

  struct DirectFBEnumRect *rect = enumlist;

  if (HIDDEN->eventbuffer)

    {

      HIDDEN->eventbuffer->Release (HIDDEN->eventbuffer);

      HIDDEN->eventbuffer = NULL;

    }

  if (HIDDEN->layer)

    {

      HIDDEN->layer->Release (HIDDEN->layer);

      HIDDEN->layer = NULL;

    }

  if (HIDDEN->dfb)

    {

      HIDDEN->dfb->Release (HIDDEN->dfb);

      HIDDEN->dfb = NULL;

    }

  /* Free video mode list */

  if (HIDDEN->modelist)

    {

      free (HIDDEN->modelist);

      HIDDEN->modelist = NULL;

    }

  /* Free mode enumeration list */

  while (rect)

    {

      struct DirectFBEnumRect *next = rect->next;

      free (rect);

      rect = next;

    }

  enumlist = NULL;

  HIDDEN->initialized = 0;

}

void DirectFB_FinalQuit(void) 

{

}