sdl_epocvideo.cpp

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          (width == 640 && height == 400 && bpp == 8) || 
          (width == 640 && height == 480 && bpp == 8) || 
          (width == 320 && height == 200 && bpp == 8))) {
		SDL_SetError("Requested video mode is not supported");
        return NULL;
    }

    if (current && current->pixels) {
        free(current->pixels);
        current->pixels = NULL;
    }
	if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {
		return(NULL);
	}

    /* Set up the new mode framebuffer */
    if (bpp == 8) 
	    current->flags = (SDL_FULLSCREEN|SDL_SWSURFACE|SDL_PREALLOC|SDL_HWPALETTE); 
    else // 12 bpp
	    current->flags = (SDL_FULLSCREEN|SDL_SWSURFACE|SDL_PREALLOC); 
	current->w = width;
	current->h = height;
    int numBytesPerPixel = ((bpp-1)>>3) + 1;   
	current->pitch = numBytesPerPixel * width; // Number of bytes in scanline 
	current->pixels = malloc(width * height * numBytesPerPixel);
	memset(current->pixels, 0, width * height * numBytesPerPixel);

	/* Set the blit function */
	_this->UpdateRects = EPOC_DirectUpdate;

    /* Must buffer height be shrinked to screen by 2 ? */
    if (current->h >= 400)
        Private->EPOC_ShrinkedHeight = ETrue;

    /* Centralize game window on device screen  */
    Private->EPOC_ScreenOffset = (Private->EPOC_ScreenSize.iWidth - current->w) / 2;

	/* We're done */
	return(current);
}

void RedrawWindowL(_THIS)
{
    SDL_Rect fullScreen;
    fullScreen.x = 0;
    fullScreen.y = 0;
    fullScreen.w = _this->screen->w;
    fullScreen.h = _this->screen->h;

#ifdef __WINS__
	    TBitmapUtil lock(Private->EPOC_Bitmap);	
        lock.Begin(TPoint(0,0)); // Lock bitmap heap
	    Private->EPOC_WindowGc->Activate(Private->EPOC_WsWindow);
#endif

    if (fullScreen.w < Private->EPOC_ScreenSize.iWidth
        && fullScreen.w < Private->EPOC_ScreenSize.iWidth) {
        /* Draw blue stripes background */
#ifdef __WINS__
        TUint16* screenBuffer = (TUint16*)Private->EPOC_Bitmap->DataAddress();
#else
        TUint16* screenBuffer = (TUint16*)Private->EPOC_FrameBuffer;
#endif
        for (int y=0; y < Private->EPOC_ScreenSize.iHeight; y++) {
            for (int x=0; x < Private->EPOC_ScreenSize.iWidth; x++) {
                TUint16 color = ((x+y)>>1) & 0xf; /* Draw pattern */
                *screenBuffer++ = color;
            }
        }
    }


    /* Tell the system that something has been drawn */
	TRect  rect = TRect(Private->EPOC_WsWindow.Size());
  	Private->EPOC_WsWindow.Invalidate(rect);

#ifdef __WINS__
	Private->EPOC_WsWindow.BeginRedraw(rect);
	Private->EPOC_WindowGc->BitBlt(TPoint(), Private->EPOC_Bitmap);
	Private->EPOC_WsWindow.EndRedraw();
	Private->EPOC_WindowGc->Deactivate();
    lock.End(); // Unlock bitmap heap
	Private->EPOC_WsSession.Flush();
#endif

    /* Draw current buffer */
    EPOC_DirectUpdate(_this, 1, &fullScreen);
}


/* We don't actually allow hardware surfaces other than the main one */
static int EPOC_AllocHWSurface(_THIS, SDL_Surface *surface)
{
	return(-1);
}
static void EPOC_FreeHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}

static int EPOC_LockHWSurface(_THIS, SDL_Surface *surface)
{
	return(0);
}
static void EPOC_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}

static int EPOC_FlipHWSurface(_THIS, SDL_Surface *surface)
{
	return(0);
}

static void EPOC_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)
{
    TInt focusWindowGroupId = Private->EPOC_WsSession.GetFocusWindowGroup();
    if (focusWindowGroupId != Private->EPOC_WsWindowGroupID) {

        /* Force focus window to redraw again for cleaning away SDL screen graphics */

  
        TInt pos = Private->EPOC_WsWindowGroup.OrdinalPosition();
        Private->EPOC_WsWindowGroup.SetOrdinalPosition(0, KMaxTInt);
       	TRect  rect = TRect(Private->EPOC_WsWindow.Size());
        Private->EPOC_WsWindow.Invalidate(rect);
        Private->EPOC_WsWindowGroup.SetOrdinalPosition(pos, ECoeWinPriorityNormal);
        
        /* If this is not the topmost window, wait here! Sleep for 1 second to give cpu to 
           multitasking and poll for being the topmost window.
        */
        while (Private->EPOC_WsSession.GetFocusWindowGroup() != Private->EPOC_WsWindowGroupID)
            SDL_Delay(1000);

        RedrawWindowL(_this);  
    }

	TInt i;
    TInt sourceNumBytesPerPixel = ((_this->screen->format->BitsPerPixel-1)>>3) + 1;   
    TInt targetNumBytesPerPixel = Private->EPOC_BytesPerPixel;   
    TInt fixedOffset = Private->EPOC_ScreenOffset;   
    TInt screenW = _this->screen->w;
    TInt screenH = _this->screen->h;
    TInt sourceScanlineLength = screenW;
    if (Private->EPOC_ShrinkedHeight) {  /* simulate 400 pixel height in 200 pixel screen */  
        sourceScanlineLength <<= 1; 
        screenH >>= 1;
    }
    TInt targetScanlineLength = Private->EPOC_ScreenSize.iWidth;
#ifdef __WINS__
	TBitmapUtil lock(Private->EPOC_Bitmap);	
    lock.Begin(TPoint(0,0)); // Lock bitmap heap
	Private->EPOC_WindowGc->Activate(Private->EPOC_WsWindow);
    TUint16* screenBuffer = (TUint16*)Private->EPOC_Bitmap->DataAddress();
#else
    TUint16* screenBuffer = (TUint16*)Private->EPOC_FrameBuffer;
#endif


	/* Render the rectangles in the list */

	for ( i=0; i < numrects; ++i ) {
        SDL_Rect rect2;
        const SDL_Rect& currentRect = rects[i];
        rect2.x = currentRect.x;
        rect2.y = currentRect.y;
        rect2.w = currentRect.w;
        rect2.h = currentRect.h;

        if (rect2.w <= 0 || rect2.h <= 0) /* sanity check */
            continue;

        if (Private->EPOC_ShrinkedHeight) {  /* simulate 400 pixel height in 200 pixel screen */        
            rect2.y >>= 1;
            if (!(rect2.h >>= 1)) 
                rect2.h = 1; // always at least 1 pixel height!
        }

        /* All variables are measured in pixels */

        /* Check rects validity, i.e. upper and lower bounds */
        TInt maxX = Min(screenW - 1, rect2.x + rect2.w - 1);
        TInt maxY = Min(screenH - 1, rect2.y + rect2.h - 1);
        if (maxX < 0 || maxY < 0) /* sanity check */
            continue;
        maxY = Min(maxY, 199); 

        TInt sourceRectWidth = maxX - rect2.x + 1;
        TInt sourceRectWidthInBytes = sourceRectWidth * sourceNumBytesPerPixel;
        TInt sourceRectHeight = maxY - rect2.y + 1;
        TInt sourceStartOffset = rect2.x + rect2.y * sourceScanlineLength;
        TInt targetStartOffset = fixedOffset + rect2.x + rect2.y * targetScanlineLength;   
        
        // !! Nokia9210 native mode: 12 bpp --> 12 bpp
        if (_this->screen->format->BitsPerPixel == 12) { 
	        TUint16* bitmapLine = (TUint16*)_this->screen->pixels + sourceStartOffset;
            TUint16* screenMemory = screenBuffer + targetStartOffset;
            for(TInt y = 0 ; y < sourceRectHeight ; y++) {
                __ASSERT_DEBUG(screenMemory < (screenBuffer 
                    + Private->EPOC_ScreenSize.iWidth * Private->EPOC_ScreenSize.iHeight), 
                    User::Panic(_L("SDL"), KErrCorrupt));
                __ASSERT_DEBUG(screenMemory >= screenBuffer, 
                    User::Panic(_L("SDL"), KErrCorrupt));
                __ASSERT_DEBUG(bitmapLine < ((TUint16*)_this->screen->pixels + 
                    + (_this->screen->w * _this->screen->h)), 
                    User::Panic(_L("SDL"), KErrCorrupt));
                __ASSERT_DEBUG(bitmapLine >=  (TUint16*)_this->screen->pixels, 
                    User::Panic(_L("SDL"), KErrCorrupt));
		        Mem::Copy(screenMemory, bitmapLine, sourceRectWidthInBytes);
		        bitmapLine += sourceScanlineLength;
		        screenMemory += targetScanlineLength;
            }
        }
        // !! 256 color paletted mode: 8 bpp  --> 12 bpp
        else { 
	        TUint8* bitmapLine = (TUint8*)_this->screen->pixels + sourceStartOffset;
            TUint16* screenMemory = screenBuffer + targetStartOffset;
            for(TInt y = 0 ; y < sourceRectHeight ; y++) {
                TUint8* bitmapPos = bitmapLine; /* 1 byte per pixel */
                TUint16* screenMemoryLinePos = screenMemory; /* 2 bytes per pixel */
                /* Convert each pixel from 256 palette to 4k color values */
                for(TInt x = 0 ; x < sourceRectWidth ; x++) {
                    __ASSERT_DEBUG(screenMemoryLinePos < (screenBuffer 
                        + (Private->EPOC_ScreenSize.iWidth * Private->EPOC_ScreenSize.iHeight)), 
                        User::Panic(_L("SDL"), KErrCorrupt));
                    __ASSERT_DEBUG(screenMemoryLinePos >= screenBuffer, 
                        User::Panic(_L("SDL"), KErrCorrupt));
                    __ASSERT_DEBUG(bitmapPos < ((TUint8*)_this->screen->pixels + 
                        + (_this->screen->w * _this->screen->h)), 
                        User::Panic(_L("SDL"), KErrCorrupt));
                    __ASSERT_DEBUG(bitmapPos >= (TUint8*)_this->screen->pixels, 
                        User::Panic(_L("SDL"), KErrCorrupt));
                    *screenMemoryLinePos = EPOC_HWPalette_256_to_4k[*bitmapPos];
                    bitmapPos++;
                    screenMemoryLinePos++;
                }
		        bitmapLine += sourceScanlineLength;
		        screenMemory += targetScanlineLength;
            }
	    }

    }    
    
#ifdef __WINS__

	TRect  rect = TRect(Private->EPOC_WsWindow.Size());
	Private->EPOC_WsWindow.Invalidate(rect);
	Private->EPOC_WsWindow.BeginRedraw(rect);
	Private->EPOC_WindowGc->BitBlt(TPoint(), Private->EPOC_Bitmap);
	Private->EPOC_WsWindow.EndRedraw();
	Private->EPOC_WindowGc->Deactivate();
    lock.End(); // Unlock bitmap heap
	Private->EPOC_WsSession.Flush();

#endif

    /* Update virtual cursor */
    //!!Private->EPOC_WsSession.SetPointerCursorPosition(Private->EPOC_WsSession.PointerCursorPosition());

    return;
}


/* Note:  If we are terminated, this could be called in the middle of
   another SDL video routine -- notably UpdateRects.
*/
void EPOC_VideoQuit(_THIS)
{
	int i;

	/* Free video mode lists */
	for ( i=0; i<SDL_NUMMODES; ++i ) {
		if ( Private->SDL_modelist[i] != NULL ) {
			free(Private->SDL_modelist[i]);
			Private->SDL_modelist[i] = NULL;
		}
	}
	
    if ( _this->screen && (_this->screen->flags & SDL_HWSURFACE) ) {
		/* Direct screen access, no memory buffer */
		_this->screen->pixels = NULL;
	}

    if (_this->screen && _this->screen->pixels) {
        free(_this->screen->pixels);
        _this->screen->pixels = NULL;
    }

    /* Free Epoc resources */

    /* Disable events for me */
	if (Private->EPOC_WsEventStatus != KRequestPending)
		Private->EPOC_WsSession.EventReadyCancel();
	if (Private->EPOC_RedrawEventStatus != KRequestPending)
		Private->EPOC_WsSession.RedrawReadyCancel();

    #ifdef __WINS__
	delete Private->EPOC_Bitmap;
	Private->EPOC_Bitmap = NULL;
    #endif

	if (Private->EPOC_WsWindow.WsHandle())
		Private->EPOC_WsWindow.Close();

	if (Private->EPOC_WsWindowGroup.WsHandle())
		Private->EPOC_WsWindowGroup.Close();

	delete Private->EPOC_WindowGc;
	Private->EPOC_WindowGc = NULL;

	delete Private->EPOC_WsScreen;
	Private->EPOC_WsScreen = NULL;

	if (Private->EPOC_WsSession.WsHandle())
		Private->EPOC_WsSession.Close();
}


WMcursor *EPOC_CreateWMCursor(_THIS, Uint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y)
{
	return (WMcursor *) 9210; // it's ok to return something unuseful but true
}

void EPOC_FreeWMCursor(_THIS, WMcursor *cursor)
{
    /* Disable virtual cursor */
    HAL::Set(HAL::EMouseState, HAL::EMouseState_Invisible);
    Private->EPOC_WsSession.SetPointerCursorMode(EPointerCursorNone);
}

int EPOC_ShowWMCursor(_THIS, WMcursor *cursor)
{

    if (cursor ==  (WMcursor *)9210) {
        /* Enable virtual cursor */
	    HAL::Set(HAL::EMouseState, HAL::EMouseState_Visible);
	    Private->EPOC_WsSession.SetPointerCursorMode(EPointerCursorNormal);
    }
    else {
        /* Disable virtual cursor */
        HAL::Set(HAL::EMouseState, HAL::EMouseState_Invisible);
        Private->EPOC_WsSession.SetPointerCursorMode(EPointerCursorNone);
    }

	return(1);
}

}; // extern "C"