sdl_epocvideo.cpp

SDL库 在进行视频显示程序spcaview安装时必须的库文件

    ConstructWindowL(_this);

    /* Initialise Epoc frame buffer */

    TDisplayMode displayMode = Private->EPOC_WsScreen->DisplayMode();

#if !defined(__WINS__) && !defined(TEST_BM_DRAW)

    TScreenInfoV01 screenInfo;
	TPckg<TScreenInfoV01> sInfo(screenInfo);
	UserSvr::ScreenInfo(sInfo);

	Private->EPOC_ScreenSize		= screenInfo.iScreenSize; 
	Private->EPOC_DisplayMode		= displayMode;
    Private->EPOC_HasFrameBuffer	= screenInfo.iScreenAddressValid;
	Private->EPOC_FrameBuffer		= Private->EPOC_HasFrameBuffer ? (TUint8*) screenInfo.iScreenAddress : NULL;
	Private->EPOC_BytesPerPixel	    = ((GetBpp(displayMode)-1) / 8) + 1;
	
    Private->EPOC_BytesPerScanLine	= screenInfo.iScreenSize.iWidth * Private->EPOC_BytesPerPixel;
	Private->EPOC_BytesPerScreen	= Private->EPOC_BytesPerScanLine * Private->EPOC_ScreenSize.iHeight;

    SDL_TRACE1("Screen width %d", screenInfo.iScreenSize.iWidth);
    SDL_TRACE1("Screen height %d", screenInfo.iScreenSize.iHeight);
    SDL_TRACE1("Screen dmode %d", displayMode);
    SDL_TRACE1("Screen valid %d", screenInfo.iScreenAddressValid);

    SDL_TRACE1("bpp %d", Private->EPOC_BytesPerPixel);
    SDL_TRACE1("bpsl %d", Private->EPOC_BytesPerScanLine);
    SDL_TRACE1("bps %d", Private->EPOC_BytesPerScreen);


    /* It seems that in SA1100 machines for 8bpp displays there is a 512 palette table at the 
     * beginning of the frame buffer. E.g. Series 7 and Netbook.
     * In 12 bpp machines the table has 16 entries.
	 */
	if (Private->EPOC_HasFrameBuffer && GetBpp(displayMode) == 8)
        {
		Private->EPOC_FrameBuffer += 512;
        }
	else
        {
        Private->EPOC_FrameBuffer += 32;
        }
        /*if (Private->EPOC_HasFrameBuffer && GetBpp(displayMode) == 12)
		Private->EPOC_FrameBuffer += 16 * 2;
    if (Private->EPOC_HasFrameBuffer && GetBpp(displayMode) == 16)
		Private->EPOC_FrameBuffer += 16 * 2;
    */
#else /* defined __WINS__ */
    
    /* Create bitmap, device and context for screen drawing */
    Private->EPOC_ScreenSize        = Private->EPOC_WsScreen->SizeInPixels();

	Private->EPOC_Bitmap = new (ELeave) CWsBitmap(Private->EPOC_WsSession);
	Private->EPOC_Bitmap->Create(Private->EPOC_ScreenSize, displayMode);

	Private->EPOC_DisplayMode	    = displayMode;
    Private->EPOC_HasFrameBuffer    = ETrue;
    Private->EPOC_FrameBuffer       = NULL; /* Private->EPOC_Bitmap->DataAddress() can change any time */
	Private->EPOC_BytesPerPixel	    = ((GetBpp(displayMode)-1) / 8) + 1;
	Private->EPOC_BytesPerScanLine  = Private->EPOC_WsScreen->SizeInPixels().iWidth * Private->EPOC_BytesPerPixel;

#endif /* __WINS__ */

#ifndef SYMBIAN_CRYSTAL
	// Get draw device for updating the screen
	TScreenInfoV01 screenInfo2;
    
    Epoc_Runtime::GetScreenInfo(screenInfo2);

	TRAPD(status, Private->EPOC_DrawDevice = CFbsDrawDevice::NewScreenDeviceL(screenInfo2, displayMode));
	User::LeaveIfError(status);
#endif

    /* The "best" video format should be returned to caller. */

    vformat->BitsPerPixel       = /*!!GetBpp(displayMode) */ 8;
    vformat->BytesPerPixel      = /*!!Private->EPOC_BytesPerPixel*/ 1;

    /* Activate events for me */

	Private->EPOC_WsEventStatus = KRequestPending;
	Private->EPOC_WsSession.EventReady(&Private->EPOC_WsEventStatus);

    SDL_TRACE("SDL:WsEventStatus");
    User::WaitForRequest(Private->EPOC_WsEventStatus); //Markus: I added this and ...

	Private->EPOC_RedrawEventStatus = KRequestPending;
	Private->EPOC_WsSession.RedrawReady(&Private->EPOC_RedrawEventStatus);
    
    SDL_TRACE("SDL:RedrawEventStatus");
    User::WaitForRequest(Private->EPOC_RedrawEventStatus); //...this, if not catches a stray event is risen
                                                           //if there are active objects used, or confucing
                                                           //actions with User::WaitForAnyRequest
    Private->EPOC_WsWindow.PointerFilter(EPointerFilterDrag, 0); 

    Private->EPOC_ScreenOffset = TPoint(0, 0);

#if defined(__WINS__) || defined(TEST_BM_DRAW)
	LockHeap(Private->EPOC_Bitmap); // Lock bitmap heap
#endif

    SDL_TRACE("SDL:DrawBackground");
	DrawBackground(_this); // Clear screen

#if defined(__WINS__) || defined(TEST_BM_DRAW)
	UnlockHeap(Private->EPOC_Bitmap); // Unlock bitmap heap
#endif
    //!! TODO: error handling
    //if (ret != KErrNone)
    //    return(-1);
    //else
	    return(0);
}


SDL_Rect **EPOC_ListModes(_THIS, SDL_PixelFormat *format, Uint32 /*flags*/)
{
    if (format->BitsPerPixel == 12 || format->BitsPerPixel == 8)
        return Private->SDL_modelist;
    return NULL;
}

int EPOC_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
{
	if ((firstcolor+ncolors) > 256)
		return -1;
//    SDL_TRACE1("colors %d", (TDisplayModeUtils::NumDisplayModeColors(Private->EPOC_DisplayMode)));
    if(TDisplayModeUtils::NumDisplayModeColors(Private->EPOC_DisplayMode) == 4096)
        {
	// Set 12 bit palette
        for(int i = firstcolor; i < ncolors; i++)
            {
	        // 4k value: 0000 rrrr gggg bbbb
	        TUint32 color4K	 = (colors[i].r & 0x0000f0) << 4;
	        color4K			|= (colors[i].g & 0x0000f0);      
	        color4K			|= (colors[i].b & 0x0000f0) >> 4;
            EPOC_HWPalette_256_to_Screen[i] = color4K;
            }
        }
    else if(TDisplayModeUtils::NumDisplayModeColors(Private->EPOC_DisplayMode) == 65536)
        {
        for(int i = firstcolor; i < ncolors; i++)
            {
			// 64k-colour displays effectively support RGB values
			// with 5 bits allocated to red, 6 to green and 5 to blue
			// 64k value: rrrr rggg gggb bbbb
	        TUint32 color64K = (colors[i].r & 0x0000f8) << 8;
	        color64K		|= (colors[i].g & 0x0000fc) << 3;
	        color64K		|= (colors[i].b & 0x0000f8) >> 3;
            EPOC_HWPalette_256_to_Screen[i] = color64K;
            }
        }
    else if(TDisplayModeUtils::NumDisplayModeColors(Private->EPOC_DisplayMode) == 16777216)
        {
        for(int i = firstcolor; i < ncolors; i++)
            {
			// 16M-colour
            //0000 0000 rrrr rrrr gggg gggg bbbb bbbb
	        TUint32 color16M = colors[i].r << 16;
	        color16M		|= colors[i].g << 8;
	        color16M		|= colors[i].b;
            EPOC_HWPalette_256_to_Screen[i] = color16M;
            }
        }
    else
        {
        return -2;
        }
	return(0);
}


SDL_Surface *EPOC_SetVideoMode(_THIS, SDL_Surface *current,
				int width, int height, int bpp, Uint32 /*flags*/)
{
	SDL_TRACE("SDL:EPOC_SetVideoMode");
    /* Check parameters */
#ifdef SYMBIAN_CRYSTAL
   if (! (bpp == 8 || bpp == 12 || bpp == 16) &&
		 (
		  (width == 640 && height == 200) ||
          (width == 640 && height == 400) || 
          (width == 640 && height == 480) || 
          (width == 320 && height == 200) || 
          (width == 320 && height == 240)
		 )) {
		SDL_SetError("Requested video mode is not supported");
        return NULL;
    }
#else // SYMBIAN_SERIES60
   if (! (bpp == 8 || bpp == 12 || bpp == 16) &&
		 (
		  (width == 320 && height == 200) || 
          (width == 320 && height == 240) ||
		  (width == 256 && height == 192) ||  
		  (width == 176 && height == 208) || 
		  (width == 208 && height == 176) || // Rotated
		  (width == 160 && height == 144)    
		 )) {
		SDL_SetError("Requested video mode is not supported");
        return NULL;
    }
#endif

    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, 16 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;

    /*
     *  Logic for getting suitable screen dimensions, offset, scaling and orientation
     */

	int w = current->w;
	int h = current->h;
	
	// Rotate, if the screen does not fit horizontally and it is landscape screen
/*
	if ((width>Private->EPOC_ScreenSize.iWidth) &&  (width>height)) {
		Private->EPOC_ScreenOrientation = CFbsBitGc::EGraphicsOrientationRotated270;
		w = current->h; 
		h = current->w; 
	}
*/
	// Get nearest stepwise scale values for width and height. The smallest supported scaled screen is 1/2.
	TInt scaleValue = 0;
	Private->EPOC_ScreenXScaleValue = 1;
	Private->EPOC_ScreenYScaleValue = 1;
	if (w > Private->EPOC_ScreenSize.iWidth) {
		// Find the biggest scale value that result the width that fits in the screen HW
		for (scaleValue = 2; scaleValue++;) {
			TInt scaledWidth = (w * (scaleValue-1))/scaleValue;
			if (scaledWidth > Private->EPOC_ScreenSize.iWidth)
				break;
		}
		Private->EPOC_ScreenXScaleValue = Max(2, scaleValue - 1);
		w = (w * (Private->EPOC_ScreenXScaleValue-1))/Private->EPOC_ScreenXScaleValue;
	}
	if (h > Private->EPOC_ScreenSize.iHeight) {
		// Find the biggest scale value that result the height that fits in the screen HW
		for (scaleValue = 2; scaleValue++;) {
			TInt scaledHeight = (h * (scaleValue-1))/scaleValue;
			if (scaledHeight > Private->EPOC_ScreenSize.iHeight)
				break;
		}
		Private->EPOC_ScreenYScaleValue = Max(2, scaleValue - 1);
		h = (h * (Private->EPOC_ScreenYScaleValue-1))/Private->EPOC_ScreenYScaleValue;
	}

    /* Centralize game window on device screen  */
    Private->EPOC_ScreenOffset.iX = (Private->EPOC_ScreenSize.iWidth - w) / 2;
	if (Private->EPOC_ScreenOffset.iX < 0)
		Private->EPOC_ScreenOffset.iX = 0;
    Private->EPOC_ScreenOffset.iY = (Private->EPOC_ScreenSize.iHeight - h) / 2;
	if (Private->EPOC_ScreenOffset.iY < 0)
		Private->EPOC_ScreenOffset.iY = 0;


    SDL_TRACE1("View width %d", w);
    SDL_TRACE1("View height %d", h);
    SDL_TRACE1("View bmode %d", bpp);
    SDL_TRACE1("View s %d", scaleValue);
    SDL_TRACE1("View x %d", Private->EPOC_ScreenOffset.iX);
    SDL_TRACE1("View y %d", Private->EPOC_ScreenOffset.iY);

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


void RedrawWindowL(_THIS)
{

#if defined(__WINS__) || defined(TEST_BM_DRAW)
	    LockHeap(Private->EPOC_Bitmap); // Lock bitmap heap
	    Private->EPOC_WindowGc->Activate(Private->EPOC_WsWindow);
#endif

    int w = _this->screen->w;
    int h = _this->screen->h;
	if (Private->EPOC_ScreenOrientation == CFbsBitGc::EGraphicsOrientationRotated270) {
		w = _this->screen->h;
		h = _this->screen->w;
	}
    if ((w < Private->EPOC_ScreenSize.iWidth)
        || (h < Private->EPOC_ScreenSize.iHeight)) {
		DrawBackground(_this);
    }

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

#if defined(__WINS__) || defined(TEST_BM_DRAW)
	Private->EPOC_WsWindow.BeginRedraw(rect);
	Private->EPOC_WindowGc->BitBlt(TPoint(), Private->EPOC_Bitmap);
	Private->EPOC_WsWindow.EndRedraw();
	Private->EPOC_WindowGc->Deactivate();
    UnlockHeap(Private->EPOC_Bitmap);; // Unlock bitmap heap
	Private->EPOC_WsSession.Flush();
#endif

    /* Draw current buffer */
    SDL_Rect fullScreen;
    fullScreen.x = 0;
    fullScreen.y = 0;
    fullScreen.w = _this->screen->w;
    fullScreen.h = _this->screen->h;
    EPOC_DirectUpdate(_this, 1, &fullScreen);
}


void DrawBackground(_THIS)
{
	/* Draw background */
#if defined(__WINS__) || defined(TEST_BM_DRAW)
	//warning heap is not locked! - a function calling must ensure that it's ok
    TUint16* screenBuffer = (TUint16*)Private->EPOC_Bitmap->DataAddress();
#else
    TUint16* screenBuffer = (TUint16*)Private->EPOC_FrameBuffer;