sdl_directfb_video.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

  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 = eventbuffer;

  return 0;
}

static SDL_Rect **DirectFB_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
  if (flags & SDL_FULLSCREEN)
    return HIDDEN->SDL_modelist[((format->BitsPerPixel + 7) / 8) - 1];
  else
    if (SDLToDFBPixelFormat (format) != DSPF_UNKNOWN)
      return (SDL_Rect**) -1;

  return NULL;
}

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 *) malloc (sizeof(*current->hwdata));
      if (!current->hwdata)
        {
          SDL_OutOfMemory();
          return NULL;
	}
      memset (current->hwdata, 0, sizeof(*current->hwdata));
    }

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

  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 *) malloc (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)
{
  DFBRectangle             sr, dr;
  IDirectFBSurface        *surface;
  DFBSurfaceBlittingFlags  flags = DSBLIT_NOFX;

  sr.x = srcrect->x;
  sr.y = srcrect->y;
  sr.w = srcrect->w;
  sr.h = srcrect->h;

  dr.x = dstrect->x;
  dr.y = dstrect->y;
  dr.w = dstrect->w;
  dr.h = dstrect->h;

  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 0;
}
	
void DirectFB_VideoQuit(_THIS)
{
  int i, j;

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

  /* Free video mode lists */
  for ( i=0; i<NUM_MODELISTS; ++i )
    {
      if ( HIDDEN->SDL_modelist[i] != NULL )
        {
          for ( j=0; HIDDEN->SDL_modelist[i][j]; ++j )
            free(HIDDEN->SDL_modelist[i][j]);
          free(HIDDEN->SDL_modelist[i]);
          HIDDEN->SDL_modelist[i] = NULL;
        }
    }

  HIDDEN->initialized = 0;
}

void DirectFB_FinalQuit(void) 
{
}