C++ IDirectFBSurface::StretchBlit方法代码示例

status_t ServerWindow::UpdateTitle (char *title){
	DFBFontDescription font_dsc;
	IDirectFBSurface *wsurface = NULL;
	int wdth;
	int ht;
	int width1, width2, width3;
	int height1, height2, height3;
		
	DFBCHECK(window->GetSurface(window, &wsurface));  
	DFBCHECK(window->GetSize(window, &wdth, &ht));
	
  if (fType==B_FLOATING_WINDOW){
  	DFBCHECK (shead->GetSize(shead, &width1, &height1));
	DFBCHECK (sok_button->GetSize(sok_button, &width2, &height2));
	DFBCHECK (sclose_button->GetSize(sclose_button, &width3, &height3));

	DFBRectangle rect;
	rect.x = 0;	rect.y = 0;	rect.h = height1;	rect.w = wdth-width2-width3;
	DFBCHECK (wsurface->StretchBlit (wsurface, shead, NULL, &rect));
	DFBCHECK (wsurface->Blit (wsurface, sok_button, NULL, rect.w, 0));
  	DFBCHECK (wsurface->Blit (wsurface, sclose_button, NULL, rect.w+width2, 0));	  		
	
  	// Draw the window title
  	font_dsc.flags = DFDESC_HEIGHT;
  	font_dsc.height = 10;
  	font_dsc.width = 10;  
  	DFBCHECK (app_server->dfb->CreateFont (app_server->dfb, "./decker.ttf", &font_dsc, &font));
  	DFBCHECK (wsurface->SetFont (wsurface, font));
  	DFBCHECK (wsurface->SetColor (wsurface, 0xff, 0x0, 0x0, 0xFF));  	
	DFBCHECK (wsurface->DrawString (wsurface, title, -1, 5, 2*height1/3, DSTF_LEFT));	
  }
  else if (fType==B_TITLED_WINDOW){
  	DFBCHECK (head->GetSize(head, &width1, &height1));
	DFBCHECK (ok_button->GetSize(ok_button, &width2, &height2));
	DFBCHECK (close_button->GetSize(close_button, &width3, &height3));

	DFBRectangle rect;
	rect.x = 0;	rect.y = 0;	rect.h = height1;	rect.w = wdth-width2-width3;
	DFBCHECK (wsurface->StretchBlit (wsurface, head, NULL, &rect));
	DFBCHECK (wsurface->Blit (wsurface, ok_button, NULL, rect.w, 0));
  	DFBCHECK (wsurface->Blit (wsurface, close_button, NULL, rect.w+width2, 0));	
  	
	// Draw the window title
  	font_dsc.flags = DFDESC_HEIGHT;
  	font_dsc.height = 15;
  	font_dsc.width = 15;  
  	DFBCHECK (app_server->dfb->CreateFont (app_server->dfb, "./decker.ttf", &font_dsc, &font));
  	DFBCHECK (wsurface->SetFont (wsurface, font));
  	DFBCHECK (wsurface->SetColor (wsurface, 0x0, 0x10, 0xfa, 0xFF));
	DFBCHECK (wsurface->DrawString (wsurface, title, -1, 6, 2*height1/3, DSTF_LEFT));	
  }	
}

static mrb_value surface_stretch_blit(mrb_state *mrb, mrb_value self)
{
    IDirectFBSurface* surface = mrb_directfb_surface(mrb, self);
    DFBResult ret = -1;
    if (surface != NULL) {
        mrb_value src_object;
        mrb_value src_rect_object;
        mrb_value dst_rect_object;
        mrb_get_args(mrb, "ooo", &src_object, &src_rect_object, &dst_rect_object);
        {
            IDirectFBSurface* src = mrb_directfb_surface(mrb, src_object);
            DFBRectangle* src_rect = mrb_directfb_rectangle(mrb, src_rect_object);
            DFBRectangle* dst_rect = mrb_directfb_rectangle(mrb, dst_rect_object);
            ret = surface->StretchBlit(surface, src, src_rect, dst_rect);
        }
    }
    return mrb_fixnum_value(ret);
}

QPixmap QDirectFBPixmapData::transformed(const QTransform &transform,
                                         Qt::TransformationMode mode) const
{
    if (!surface || transform.type() != QTransform::TxScale
        || mode != Qt::FastTransformation)
    {
        QDirectFBPixmapData *that = const_cast<QDirectFBPixmapData*>(this);
        const QImage *image = that->buffer();
        if (image) { // avoid deep copy
            const QImage transformed = image->transformed(transform, mode);
            that->unlockDirectFB();
            QDirectFBPixmapData *data = new QDirectFBPixmapData(pixelType());
            data->fromImage(transformed, Qt::AutoColor);
            return QPixmap(data);
        }
        return QPixmapData::transformed(transform, mode);
    }

    int w, h;
    surface->GetSize(surface, &w, &h);

    const QSize size = transform.mapRect(QRect(0, 0, w, h)).size();
    if (size.isEmpty())
        return QPixmap();

    QDirectFBPixmapData *data = new QDirectFBPixmapData(pixelType());
    data->resize(size.width(), size.height());

    IDirectFBSurface *dest = data->surface;
    dest->SetBlittingFlags(dest, DSBLIT_NOFX);

    const DFBRectangle srcRect = { 0, 0, w, h };
    const DFBRectangle destRect = { 0, 0, size.width(), size.height() };
    dest->StretchBlit(dest, surface, &srcRect, &destRect);

    return QPixmap(data);
}

//.........这里部分代码省略.........
    destsurf->GetClip(destsurf, &clip_region);
    dr.x += clip_region.x1;
    dr.y += clip_region.y1;

    if (texturedata->display) {
        int px, py;
        SDL_Window *window = renderer->window;
        IDirectFBWindow *dfbwin = get_dfb_window(window);
        SDL_DFB_WINDOWDATA(window);
        SDL_VideoDisplay *display = texturedata->display;
        DFB_DisplayData *dispdata = (DFB_DisplayData *) display->driverdata;

        SDL_DFB_CHECKERR(dispdata->
                         vidlayer->SetSourceRectangle(dispdata->vidlayer,
                                                      sr.x, sr.y, sr.w, sr.h));
        dfbwin->GetPosition(dfbwin, &px, &py);
        px += windata->client.x;
        py += windata->client.y;
        SDL_DFB_CHECKERR(dispdata->
                         vidlayer->SetScreenRectangle(dispdata->vidlayer,
                                                      px + dr.x,
                                                      py + dr.y,
                                                      dr.w,
                                                      dr.h));
    } else {
        DFBSurfaceBlittingFlags flags = 0;

#if 0
        if (texturedata->dirty.list) {
            SDL_DirtyRect *dirty;
            void *pixels;
            int bpp = DFB_BYTES_PER_PIXEL(DirectFB_SDLToDFBPixelFormat(texture->format));
            int pitch = texturedata->pitch;

            for (dirty = texturedata->dirty.list; dirty; dirty = dirty->next) {
                SDL_Rect *rect = &dirty->rect;
                pixels =
                    (void *) ((Uint8 *) texturedata->pixels +
                              rect->y * pitch + rect->x * bpp);
                DirectFB_UpdateTexture(renderer, texture, rect,
                                       pixels,
                                       texturedata->pitch);
            }
            SDL_ClearDirtyRects(&texturedata->dirty);
        }
#endif
        if (texturedata->isDirty)
        {
            SDL_Rect rect;

            rect.x = 0;
            rect.y = 0;
            rect.w = texture->w;
            rect.h = texture->h;

            DirectFB_UpdateTexture(renderer, texture, &rect, texturedata->pixels, texturedata->pitch);
        }

        alpha = r = g = b = 0xff;
        if (texture->modMode & SDL_TEXTUREMODULATE_ALPHA){
            alpha = texture->a;
            flags |= DSBLIT_BLEND_COLORALPHA;
        }

        if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) {
            r = texture->r;
            g = texture->g;
            b = texture->b;
            flags |= DSBLIT_COLORIZE;
        }
        SDL_DFB_CHECKERR(destsurf->
                         SetColor(destsurf, r, g, b, alpha));

        /* ???? flags |= DSBLIT_SRC_PREMULTCOLOR; */

        SetBlendMode(data, texture->blendMode, texturedata);

        SDL_DFB_CHECKERR(destsurf->SetBlittingFlags(destsurf,
                                                    data->blitFlags | flags));

#if (DFB_VERSION_ATLEAST(1,2,0))
        SDL_DFB_CHECKERR(destsurf->SetRenderOptions(destsurf,
                                                    texturedata->
                                                    render_options));
#endif

        if (srcrect->w == dstrect->w && srcrect->h == dstrect->h) {
            SDL_DFB_CHECKERR(destsurf->Blit(destsurf,
                                            texturedata->surface,
                                            &sr, dr.x, dr.y));
        } else {
            SDL_DFB_CHECKERR(destsurf->StretchBlit(destsurf,
                                                   texturedata->surface,
                                                   &sr, &dr));
        }
    }
    return 0;
  error:
    return -1;
}

void
DirectFB_WM_RedrawLayout(_THIS, SDL_Window * window)
{
    SDL_DFB_WINDOWDATA(window);
    IDirectFBSurface *s = windata->window_surface;
    DFB_Theme *t = &windata->theme;
    int i;
    int d = (t->caption_size - t->font_size) / 2;
    int x, y, w;


    if (!windata->is_managed || (window->flags & SDL_WINDOW_FULLSCREEN))
        return;

    SDL_DFB_CHECK(s->SetSrcBlendFunction(s, DSBF_ONE));
    SDL_DFB_CHECK(s->SetDstBlendFunction(s, DSBF_ZERO));
    SDL_DFB_CHECK(s->SetDrawingFlags(s, DSDRAW_NOFX));
    SDL_DFB_CHECK(s->SetBlittingFlags(s, DSBLIT_NOFX));

    LoadFont(_this, window);
    /* s->SetDrawingFlags(s, DSDRAW_BLEND); */
    s->SetColor(s, COLOR_EXPAND(t->frame_color));
    /* top */
    for (i = 0; i < t->top_size; i++)
        s->DrawLine(s, 0, i, windata->size.w, i);
    /* bottom */
    for (i = windata->size.h - t->bottom_size; i < windata->size.h; i++)
        s->DrawLine(s, 0, i, windata->size.w, i);
    /* left */
    for (i = 0; i < t->left_size; i++)
        s->DrawLine(s, i, 0, i, windata->size.h);
    /* right */
    for (i = windata->size.w - t->right_size; i < windata->size.w; i++)
        s->DrawLine(s, i, 0, i, windata->size.h);
    /* Caption */
    s->SetColor(s, COLOR_EXPAND(t->caption_color));
    s->FillRectangle(s, t->left_size, t->top_size, windata->client.w,
                     t->caption_size);
    /* Close Button */
    w = t->caption_size;
    x = windata->size.w - t->right_size - w + d;
    y = t->top_size + d;
    s->SetColor(s, COLOR_EXPAND(t->close_color));
    DrawTriangle(s, 1, x, y, w - 2 * d);
    /* Max Button */
    s->SetColor(s, COLOR_EXPAND(t->max_color));
    DrawTriangle(s, window->flags & SDL_WINDOW_MAXIMIZED ? 1 : 0, x - w,
               y, w - 2 * d);

    /* Caption */
    if (*window->title) {
        s->SetColor(s, COLOR_EXPAND(t->font_color));
        DrawCraption(_this, s, (x - w) / 2, t->top_size + d, window->title);
    }
    /* Icon */
    if (windata->icon) {
        DFBRectangle dr;

        dr.x = t->left_size + d;
        dr.y = t->top_size + d;
        dr.w = w - 2 * d;
        dr.h = w - 2 * d;
        s->SetBlittingFlags(s, DSBLIT_BLEND_ALPHACHANNEL);

        s->StretchBlit(s, windata->icon, NULL, &dr);
    }
    windata->wm_needs_redraw = 0;
}

int
main( int argc, char *argv[] )
{
     int                     i;
     DFBResult               ret;
     DFBSurfaceDescription   desc;
     IDirectFB              *dfb;
     IDirectFBImageProvider *provider = NULL;
     IDirectFBSurface       *source   = NULL;
     IDirectFBSurface       *dest     = NULL;
     const char             *url      = NULL;

     /* Parse arguments. */
     for (i=1; i<argc; i++) {
          if (!strcmp( argv[i], "-h" ))
               return show_usage( argv[0] );
          else if (!url)
               url = argv[i];
          else
               return show_usage( argv[0] );
     }

     /* Check if we got an URL. */
     if (!url)
          return show_usage( argv[0] );
          
     /* Initialize DirectFB. */
     ret = DirectFBInit( &argc, &argv );
     if (ret) {
          D_DERROR( ret, "DFBTest/Scale: DirectFBInit() failed!\n" );
          return ret;
     }

     /* Create super interface. */
     ret = DirectFBCreate( &dfb );
     if (ret) {
          D_DERROR( ret, "DFBTest/Scale: DirectFBCreate() failed!\n" );
          return ret;
     }

     /* Create an image provider for the image to be loaded. */
     ret = dfb->CreateImageProvider( dfb, url, &provider );
     if (ret) {
          D_DERROR( ret, "DFBTest/Scale: IDirectFB::CreateImageProvider( '%s' ) failed!\n", url );
          goto out;
     }

     /* Get the surface description. */
     ret = provider->GetSurfaceDescription( provider, &desc );
     if (ret) {
          D_DERROR( ret, "DFBTest/Scale: IDirectFBImageProvider::GetSurfaceDescription() failed!\n" );
          goto out;
     }
     
     desc.pixelformat = DSPF_LUT8;

     D_INFO( "DFBTest/Scale: Source is %dx%d using %s\n",
             desc.width, desc.height, dfb_pixelformat_name(desc.pixelformat) );

     /* Create a surface for the image. */
     ret = dfb->CreateSurface( dfb, &desc, &source );
     if (ret) {
          D_DERROR( ret, "DFBTest/Scale: IDirectFB::CreateSurface() failed!\n" );
          goto out;
     }
     
     ret = provider->RenderTo( provider, source, NULL );
     if (ret) {
          D_DERROR( ret, "DFBTest/Scale: IDirectFBImageProvider::RenderTo() failed!\n" );
          goto out;
     }
     
     desc.width  = desc.width  * 3 / 4;
     desc.height = desc.height * 3 / 4;

     if (DFB_PIXELFORMAT_IS_INDEXED( desc.pixelformat ))
          desc.pixelformat = DSPF_ARGB;

     D_INFO( "DFBTest/Scale: Destination is %dx%d using %s\n",
             desc.width, desc.height, dfb_pixelformat_name(desc.pixelformat) );

     /* Create a surface for the image. */
     ret = dfb->CreateSurface( dfb, &desc, &dest );
     if (ret) {
          D_DERROR( ret, "DFBTest/Scale: IDirectFB::CreateSurface() failed!\n" );
          goto out;
     }

     dest->SetBlittingFlags( dest, DSBLIT_SRC_PREMULTIPLY );
     dest->StretchBlit( dest, source, NULL, NULL );

     dest->Dump( dest, "dfbtest_scale", NULL );


out:
     if (dest)
          dest->Release( dest );

     if (source)
          source->Release( source );
//.........这里部分代码省略.........

//---------------------------------------------------------------------------------
//--------------------------wael work----------------------
//---------------------------------------------------------------------------------
status_t ServerWindow::CreateWindow (IDirectFBDisplayLayer *layer){

  DFBFontDescription font_dsc;
  DFBWindowDescription wdsc;  
  IDirectFBSurface *wsurface = NULL;
  DFBSurfaceDescription dsc;
  
//  char *title;TODO: I need to convert the fTitle from BString to char *
  char title[fTitle.CountChars()+1];
  fTitle.CopyInto(title, 0, fTitle.CountChars());
  DFBRectangle frame;
  frame.x=(int)fFrame.LeftTop().x;
  frame.y=(int)fFrame.LeftTop().y;
  frame.w=(int)fFrame.IntegerWidth();
  frame.h=(int)fFrame.IntegerHeight();
    
  int width1, width2, width3;
  int height1, height2, height3;

  //create window inside the primary layer  
  wdsc.flags = (DFBWindowDescriptionFlags)(DWDESC_CAPS | DWDESC_WIDTH | DWDESC_HEIGHT | DWDESC_POSX | DWDESC_POSY | DWDESC_SURFACE_CAPS);
  wdsc.caps = DWCAPS_ALPHACHANNEL;
  wdsc.width = frame.w;
  wdsc.height = frame.h;
  wdsc.posx = frame.x;
  wdsc.posy = frame.y;
  wdsc.surface_caps = DSCAPS_FLIPPING;
  DFBCHECK(layer->CreateWindow(layer, &wdsc, &window));
  
  //Get the window surface and clear it
  DFBCHECK(window->GetSurface(window, &wsurface));  
  DFBCHECK(wsurface->Clear (wsurface, 0x00, 0x00, 0x00, 0x00));
  DFBCHECK(window->SetOpaqueRegion (window, 0, 0, frame.h, frame.w));
  
  //Set the window options to be transparent
  DFBWindowOptions options;
  window->GetOptions (window, &options);
  
  options = (DFBWindowOptions) ( options | DWOP_SHAPED );
  DFBCHECK(window->SetOptions (window, options));  
  wsurface->SetSrcColorKey(wsurface, R, G, B);
  wsurface->SetBlittingFlags(wsurface, DSBLIT_SRC_COLORKEY);  
        
  if (fType==B_FLOATING_WINDOW){
  	DFBCHECK (shead->GetSize(shead, &width1, &height1));
	DFBCHECK (sok_button->GetSize(sok_button, &width2, &height2));
	DFBCHECK (sclose_button->GetSize(sclose_button, &width3, &height3));

	DFBRectangle rect;
	rect.x = 0;
	rect.y = 0;
	rect.h = height1;
	rect.w = frame.w-width2-width3;
	DFBCHECK (wsurface->StretchBlit (wsurface, shead, NULL, &rect));
	DFBCHECK (wsurface->Blit (wsurface, sok_button, NULL, rect.w, 0));
  	DFBCHECK (wsurface->Blit (wsurface, sclose_button, NULL, rect.w+width2, 0));	  	

  	// Draw the window title
  	font_dsc.flags = DFDESC_HEIGHT;
  	font_dsc.height = 10;
  	font_dsc.width = 10;  
  	DFBCHECK (app_server->dfb->CreateFont (app_server->dfb, "./decker.ttf", &font_dsc, &font));
  	DFBCHECK (wsurface->SetFont (wsurface, font));
  	DFBCHECK (wsurface->SetColor (wsurface, 0xff, 0x0, 0x0, 0xFF));
	int size = 0;
	DFBRectangle rect1;		
  	DFBCHECK (font->GetStringExtents (font, title, -1, NULL, &rect1));
	if (rect1.w > rect.w){
		do{
			size++;
			DFBCHECK (font->GetStringExtents (font, title, size, NULL, &rect1));
		}while (rect1.w < rect.w);
		size--;
	}  		  	
	DFBCHECK (wsurface->DrawString (wsurface, title, size-1, 5, 2*height1/3, DSTF_LEFT));	
		
	rect.x = 0;
	rect.y = height1;
	rect.w = frame.w;
	rect.h = frame.h-height1;
	DFBCHECK (wsurface->StretchBlit (wsurface, body, NULL, &rect));	
  }
  else if (fType==B_TITLED_WINDOW){
  	DFBCHECK (head->GetSize(head, &width1, &height1));
	DFBCHECK (ok_button->GetSize(ok_button, &width2, &height2));
	DFBCHECK (close_button->GetSize(close_button, &width3, &height3));

	DFBRectangle rect;
	rect.x = 0;
	rect.y = 0;
	rect.h = height1;
	rect.w = frame.w-width2-width3;
	DFBCHECK (wsurface->StretchBlit (wsurface, head, NULL, &rect));
	DFBCHECK (wsurface->Blit (wsurface, ok_button, NULL, rect.w, 0));
  	DFBCHECK (wsurface->Blit (wsurface, close_button, NULL, rect.w+width2, 0));
	
	// Draw the window title
//.........这里部分代码省略.........

//.........这里部分代码省略.........
     ret = provider->GetSurfaceDescription( provider, &desc );
     if (ret) {
          D_DERROR( ret, "DFBTest/Blit: IDirectFBImageProvider::GetSurfaceDescription() failed!\n" );
          goto out;
     }

     if (source_format != DSPF_UNKNOWN)
          desc.pixelformat = source_format;
     
     D_INFO( "DFBTest/Blit: Source is %dx%d using %s\n",
             desc.width, desc.height, dfb_pixelformat_name(desc.pixelformat) );

     /* Create a surface for the image. */
     ret = dfb->CreateSurface( dfb, &desc, &source );
     if (ret) {
          D_DERROR( ret, "DFBTest/Blit: IDirectFB::CreateSurface() failed!\n" );
          goto out;
     }
     
     ret = provider->RenderTo( provider, source, NULL );
     if (ret) {
          D_DERROR( ret, "DFBTest/Blit: IDirectFBImageProvider::RenderTo() failed!\n" );
          goto out;
     }

     /* Fill description for a primary surface. */
     desc.flags = DSDESC_CAPS;
     desc.caps  = DSCAPS_PRIMARY | DSCAPS_FLIPPING;

     if (dest_format != DSPF_UNKNOWN) {
          desc.flags       |= DSDESC_PIXELFORMAT;
          desc.pixelformat  = dest_format;
     }

     if (dest_resize)
          desc.flags |= DSDESC_WIDTH | DSDESC_HEIGHT;

     dfb->SetCooperativeLevel( dfb, DFSCL_FULLSCREEN );

     /* Create a primary surface. */
     ret = dfb->CreateSurface( dfb, &desc, &dest );
     if (ret) {
          D_DERROR( ret, "DFBTest/Blit: IDirectFB::CreateSurface() failed!\n" );
          goto out;
     }

     dest->GetSize( dest, &desc.width, &desc.height );
     dest->GetPixelFormat( dest, &desc.pixelformat );

     D_INFO( "DFBTest/Blit: Destination is %dx%d using %s\n",
             desc.width, desc.height, dfb_pixelformat_name(desc.pixelformat) );

     for (i=0; i<100000; i++) {
          int j,n = rand()%100;

          for (j=0; j<n; j++) {
               switch (rand()%3) {
                    case 0:
                         dest->SetDrawingFlags( dest, rand() & (DSDRAW_BLEND) );
                         dest->FillRectangle( dest, rand()%100, rand()%100, rand()%100, rand()%100 );
                         break;

                    case 1:
                         dest->SetBlittingFlags( dest, rand() & (DSBLIT_BLEND_ALPHACHANNEL |
                                                                 DSBLIT_BLEND_COLORALPHA   |
                                                                 DSBLIT_COLORIZE           |
                                                                 DSBLIT_ROTATE90) );
                         dest->Blit( dest, source, NULL, rand()%100, rand()%100 );
                         break;

                    case 2:
                         dest->SetBlittingFlags( dest, rand() & (DSBLIT_BLEND_ALPHACHANNEL |
                                                                 DSBLIT_BLEND_COLORALPHA   |
                                                                 DSBLIT_COLORIZE           |
                                                                 DSBLIT_ROTATE90) );
                         dest->StretchBlit( dest, source, NULL, NULL );
                         break;
               }
          }

          dfb->WaitIdle( dfb );

          dest->Flip( dest, NULL, DSFLIP_NONE );
     }

out:
     if (dest)
          dest->Release( dest );

     if (source)
          source->Release( source );

     if (provider)
          provider->Release( provider );

     /* Shutdown DirectFB. */
     dfb->Release( dfb );

     return ret;
}

//.........这里部分代码省略.........
    }

    /* Create an image provider for the image to be loaded. */
    ret = dfb->CreateImageProvider( dfb, url, &provider );
    if (ret) {
        D_DERROR( ret, "DFBTest/Scale: IDirectFB::CreateImageProvider( '%s' ) failed!\n", url );
        goto out;
    }

    /* Get the surface description. */
    ret = provider->GetSurfaceDescription( provider, &desc );
    if (ret) {
        D_DERROR( ret, "DFBTest/Scale: IDirectFBImageProvider::GetSurfaceDescription() failed!\n" );
        goto out;
    }

    desc.pixelformat = DSPF_NV21;

    D_INFO( "DFBTest/Scale: Source is %dx%d using %s\n",
            desc.width, desc.height, dfb_pixelformat_name(desc.pixelformat) );

    /* Create a surface for the image. */
    ret = dfb->CreateSurface( dfb, &desc, &source );
    if (ret) {
        D_DERROR( ret, "DFBTest/Scale: IDirectFB::CreateSurface() failed!\n" );
        goto out;
    }

    ret = provider->RenderTo( provider, source, NULL );
    if (ret) {
        D_DERROR( ret, "DFBTest/Scale: IDirectFBImageProvider::RenderTo() failed!\n" );
        goto out;
    }

    desc.width  = desc.width  * 3 / 4;
    desc.height = desc.height * 3 / 4;

    D_INFO( "DFBTest/Scale: Destination is %dx%d using %s\n",
            desc.width, desc.height, dfb_pixelformat_name(desc.pixelformat) );

    /* Create a surface for the image. */
    ret = dfb->CreateSurface( dfb, &desc, &dest );
    if (ret) {
        D_DERROR( ret, "DFBTest/Scale: IDirectFB::CreateSurface() failed!\n" );
        goto out;
    }

    DFBRectangle srect = {
        10, 10, 200, 200
    };

    DFBRectangle drect = {
        10, 10, 300, 300
    };

    DFBRegion clip = {
        40, 40, 199, 199
    };

    dest->Clear( dest, 0xff, 0xff, 0xff, 0xff );

    dest->SetClip( dest, &clip );
    dest->StretchBlit( dest, source, &srect, &drect );


    desc.pixelformat = DSPF_ARGB;

    D_INFO( "DFBTest/Scale: Destination2 is %dx%d using %s\n",
            desc.width, desc.height, dfb_pixelformat_name(desc.pixelformat) );

    /* Create a surface for the image. */
    ret = dfb->CreateSurface( dfb, &desc, &dest2 );
    if (ret) {
        D_DERROR( ret, "DFBTest/Scale: IDirectFB::CreateSurface() failed!\n" );
        goto out;
    }

    dest2->Blit( dest2, dest, NULL, 0, 0 );

    dest2->Dump( dest2, "dfbtest_scale_nv21", NULL );


out:
    if (dest2)
        dest2->Release( dest2 );

    if (dest)
        dest->Release( dest );

    if (source)
        source->Release( source );

    if (provider)
        provider->Release( provider );

    /* Shutdown DirectFB. */
    dfb->Release( dfb );

    return ret;
}