sdl_epocvideo.cpp

SDL库 在进行视频显示程序spcaview安装时必须的库文件

        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;
            palette[i] = color4K;
            }
        }
    else if(TDisplayModeUtils::NumDisplayModeColors(mode) == 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;
            palette[i] = color64K;
            }
        }
    else if(TDisplayModeUtils::NumDisplayModeColors(mode) == 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;
            palette[i] = color16M;
            }
        }
    else
        {
        return -2;
        }
    if(EpocSdlEnv::SetPalette(firstcolor, ncolors, palette) == KErrNone)
    	return 0;
	return -1;
	}


/*	
void AllocHWSurfaceL(CFbsBitmap*& aBitmap, const TDisplayMode& aMode, const TSize& aSize)
	{
	aBitmap = new (ELeave) CFbsBitmap();	
	if(KErrNone != aBitmap->CreateHardwareBitmap(aSize, aMode,
		EpocSdlEnv::EikonEnv().EikAppUi()->Application()->AppDllUid())) 
	//...if it fails - should we use wsbitmaps???
		{//the good reason to use hw bitmaps is that they wont need lock heap
		PANIC_IF_ERROR(aBitmap->Create(aSize, aMode));
		}
	}
	
int CreateSurfaceL(_THIS, SDL_Surface* surface)
    {
    __ASSERT_ALWAYS(Private->iFrame == NULL, PANIC(KErrAlreadyExists));
;
	TInt dmode = EColorLast;
	
	TDisplayMode displayMode;
	EpocSdlEnv::GetDiplayMode(displayMode);
	
	if(
	TDisplayModeUtils::NumDisplayModeBitsPerPixel(displayMode)
	== surface->format->BitsPerPixel)
		{
		dmode = displayMode;
		}
	else
		{
		--dmode;
		while(TDisplayModeUtils::IsDisplayModeColor(TDisplayMode(dmode)) &&
			TDisplayModeUtils::NumDisplayModeBitsPerPixel(TDisplayMode(dmode)) !=
			surface->format->BitsPerPixel)
			--dmode;
		}

	__ASSERT_ALWAYS(TDisplayModeUtils::IsDisplayModeColor(TDisplayMode(dmode)), PANIC(KErrNotSupported));
	TRAPD(err, AllocHWSurfaceL(Private->iFrame, TDisplayMode(dmode), TSize(surface->w, surface->h)));
	return err == KErrNone ? 0 : -1;
    }
*/

TDisplayMode GetDisplayMode(TInt aBitsPerPixel)
	{
	const TDisplayMode displayMode = EpocSdlEnv::DisplayMode();
	TInt dmode = EColorLast;
	if(
	TDisplayModeUtils::NumDisplayModeBitsPerPixel(displayMode)
	== aBitsPerPixel)
		{
		dmode = displayMode;
		}
	else
		{
		--dmode;
		while(TDisplayModeUtils::IsDisplayModeColor(TDisplayMode(dmode)) &&
			TDisplayModeUtils::NumDisplayModeBitsPerPixel(TDisplayMode(dmode)) !=
			aBitsPerPixel)
			--dmode;
		}
	return TDisplayMode(dmode);
	}

SDL_Surface *EPOC_SetVideoMode(_THIS, SDL_Surface *current,
				int width, int height, int bpp, Uint32 flags)
	{
	const TSize screenSize = EpocSdlEnv::WindowSize(TSize(width, height));
	if(width > screenSize.iWidth || height > screenSize.iHeight)
	    {
	    if(flags & SDL_FULLSCREEN)
	        {
	        width = screenSize.iWidth;
	        height = screenSize.iHeight;
	        }
	    else    
		    return NULL;
	    }

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

	current->flags = 0;
	if(width == screenSize.iWidth && height == screenSize.iHeight)
		current->flags |= SDL_FULLSCREEN;
	
	const int numBytesPerPixel = ((bpp-1)>>3) + 1;   
	current->pitch = numBytesPerPixel * width; // Number of bytes in scanline 

    /* Set up the new mode framebuffer */
   	current->flags |= SDL_PREALLOC;
   	
   	if(bpp <= 8)
   		current->flags |= SDL_HWPALETTE;
   	
   	User::Free(Private->iSwSurface);
   	current->pixels = NULL;
   	Private->iSwSurface = NULL;
   	
   	if(flags & SDL_HWSURFACE)
   	    {
   	    current->flags |= SDL_HWSURFACE;
   	   //	current->pixels = NULL;
   	   // 	Private->iSwSurface = NULL;
   	    }
   	else
   	    {
   	    current->flags |= SDL_SWSURFACE;
   	    const TInt surfacesize = width * height * numBytesPerPixel;  
   	   	Private->iSwSurfaceSize = TSize(width, height);
   	   	delete Private->iSwSurface;
   	   	Private->iSwSurface = NULL;
   	  	current->pixels = (TUint8*) User::AllocL(surfacesize);
   	  	Private->iSwSurface = (TUint8*) current->pixels;
   	  	const TInt err = EpocSdlEnv::AllocSwSurface
   	  		(TSize(width, height), GetDisplayMode(current->format->BitsPerPixel));
	    if(err != KErrNone)
	    	return NULL;
	    }
	
	current->w = width;
	current->h = height;
	
  
	
	/* Set the blit function */
	_this->UpdateRects = EPOC_DirectUpdate;

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


    /* Centralize game window on device screen  */
   
    
    Private->iScreenPos.iX = Max(0, (screenSize.iWidth  - width)  / 2);
    Private->iScreenPos.iY = Max(0, (screenSize.iHeight - height) / 2);
    
 //   delete (Private->iFrame);
//	Private->iFrame = NULL;
	
  //  TRAPD(err, CreateSurfaceL(_this, current));
  //  PANIC_IF_ERROR(err);
    
    SDL_TRACE1("View width %d", width);
    SDL_TRACE1("View height %d", height);
    SDL_TRACE1("View bmode %d", bpp);
    SDL_TRACE1("View x %d", Private->iScreenPos.iX);
    SDL_TRACE1("View y %d", Private->iScreenPos.iY);

	EpocSdlEnv::LockPalette(EFalse);
	/* We're done */
	return(current);
}



static int EPOC_AllocHWSurface(_THIS, SDL_Surface* surface)
	{
	return KErrNone == EpocSdlEnv::AllocHwSurface(TSize(surface->w, surface->h), GetDisplayMode(surface->format->BitsPerPixel));
	}
	
static void EPOC_FreeHWSurface(_THIS, SDL_Surface* /*surface*/)
	{
	}

static int EPOC_LockHWSurface(_THIS, SDL_Surface* surface)
	{
	if(EpocSdlEnv::IsDsaAvailable())
		{
		TUint8* address = EpocSdlEnv::LockHwSurface();
		if(address != NULL)
			{
			surface->pixels = address;
			return 1;
			}
		}
	return 0;
	}
static void EPOC_UnlockHWSurface(_THIS, SDL_Surface* /*surface*/)
	{
	EpocSdlEnv::UnlockHwSurface();
	}

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

static void EPOC_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)
	{
	if(EpocSdlEnv::IsDsaAvailable())
		{
		if(Private->iSwSurface)
		    {
		    const TRect target(Private->iScreenPos, Private->iSwSurfaceSize);
		    for(TInt i = 0; i < numrects ;i++)
		    	{
		    	const TRect rect(TPoint(rects[i].x, rects[i].y),
		    		TSize(rects[i].w, rects[i].h));
		    	if(!EpocSdlEnv::AddUpdateRect(Private->iSwSurface, rect, target))
		    		return; //not succesful
		    	}
		    EpocSdlEnv::UpdateSwSurface();
		    }
		SDL_PauseAudio(0);
		}
    else
    	{                                                      
     	SDL_PauseAudio(1);
    	EpocSdlEnv::WaitDsaAvailable();              
		}
	}


/* Note:  If we are terminated, this could be called in the middle of
   another SDL video routine -- notably UpdateRects.
*/
void EPOC_VideoQuit(_THIS)
	{
//	delete Private->iFrame;
//	Private->iFrame = NULL;
	User::Free(Private->iSwSurface);
	Private->iSwSurface = NULL;
	EpocSdlEnv::FreeSurface();
	}
	
	


WMcursor *EPOC_CreateWMCursor(_THIS, Uint8* /*data*/, Uint8* /*mask*/, int /*w*/, int /*h*/, int /*hot_x*/, int /*hot_y*/)
    {
    return (WMcursor*) 1; //hii! prevents SDL to view a std cursor
    }

void EPOC_FreeWMCursor(_THIS, WMcursor* /*cursor*/)
    {
    }

int EPOC_ShowWMCursor(_THIS, WMcursor *cursor)
    {
    return true;  
    }