sdl_nxvideo.c

网络MPEG4IP流媒体开发源代码

}

static void NX_DestroyWindow (_THIS, SDL_Surface * screen)
{
    Dprintf ("enter NX_DestroyWindow\n") ;

    if (! SDL_windowid) {
        if (screen && (screen -> flags & SDL_FULLSCREEN)) {
            screen -> flags &= ~ SDL_FULLSCREEN ;
            NX_LeaveFullScreen (this) ;
        }

        // Destroy the output window
        if (SDL_Window && SDL_Window != GR_ROOT_WINDOW_ID) {
            GrDestroyWindow (SDL_Window) ;
        }
    }
    
    // Free the graphics context
    if (! SDL_GC) {
        GrDestroyGC (SDL_GC) ;
        SDL_GC = 0;
    }

    Dprintf ("leave NX_DestroyWindow\n") ;
}

static int NX_CreateWindow (_THIS, SDL_Surface * screen,
                int w, int h, int bpp, Uint32 flags)
{
    Dprintf ("enter NX_CreateWindow\n") ;

    // If a window is already present, destroy it and start fresh
    if (SDL_Window && SDL_Window != GR_ROOT_WINDOW_ID) {
        NX_DestroyWindow (this, screen) ;
    }

    // See if we have been given a window id
    if (SDL_windowid) {
        SDL_Window = strtol (SDL_windowid, NULL, 0) ;
    } else {
        SDL_Window = 0 ;
    }
    
    if ( ! SDL_ReallocFormat (screen, bpp, SDL_Visual.red_mask, 
        SDL_Visual.green_mask, SDL_Visual.blue_mask, 0))
        return -1;

    // Create (or use) the nanox display window
    if (! SDL_windowid) {

        SDL_Window = GrNewWindow (GR_ROOT_WINDOW_ID, 0, 0, w, h, 0, BLACK, WHITE) ;

        GrSelectEvents (SDL_Window, (GR_EVENT_MASK_EXPOSURE       |
            GR_EVENT_MASK_BUTTON_DOWN  | GR_EVENT_MASK_BUTTON_UP  |
            GR_EVENT_MASK_FOCUS_IN     | GR_EVENT_MASK_FOCUS_OUT  |
            GR_EVENT_MASK_KEY_DOWN     | GR_EVENT_MASK_KEY_UP     |
            GR_EVENT_MASK_MOUSE_ENTER  | GR_EVENT_MASK_MOUSE_EXIT |
            GR_EVENT_MASK_MOUSE_MOTION | GR_EVENT_MASK_UPDATE     |
            GR_EVENT_MASK_CLOSE_REQ)) ;
    }
    
    /* Create the graphics context here, once we have a window */
    SDL_GC = GrNewGC () ;
    if (SDL_GC == 0) {
        SDL_SetError("Couldn't create graphics context");
        return(-1);
    }

    // Map them both and go fullscreen, if requested
    if (! SDL_windowid) {
        GrMapWindow (SDL_Window) ;
        if (flags & SDL_FULLSCREEN) {
            screen -> flags |= SDL_FULLSCREEN ;
            NX_EnterFullScreen (this) ;
        } else {
            screen -> flags &= ~ SDL_FULLSCREEN ;
        }
    }

#ifdef ENABLE_NANOX_DIRECT_FB
    /* attempt allocating the client side framebuffer */
    Clientfb = GrOpenClientFramebuffer();
    /* NULL return will default to using GrArea()*/
#endif

    Dprintf ("leave NX_CreateWindow\n") ;
    return 0 ;
}

SDL_Surface * NX_SetVideoMode (_THIS, SDL_Surface * current,
                int width, int height, int bpp, Uint32 flags)
{
    Dprintf ("enter NX_SetVideoMode\n") ;

    // Lock the event thread, in multi-threading environments
    SDL_Lock_EventThread () ;

    bpp = SDL_Visual.bpp ;
    if (NX_CreateWindow (this, current, width, height, bpp, flags) < 0) {
        current = NULL;
        goto done;
    }

    if (current -> w != width || current -> h != height) {
        current -> w = width ;
        current -> h = height ;
        current -> pitch = SDL_CalculatePitch (current) ;
        NX_ResizeImage (this, current, flags) ;
    }
    current -> flags |= (flags & (SDL_RESIZABLE | SDL_NOFRAME)) ;

  done:
    SDL_Unlock_EventThread () ;

    Dprintf ("leave NX_SetVideoMode\n") ;

    // We're done!
    return current ;
}

// ncolors <= 256
int NX_SetColors (_THIS, int firstcolor, int ncolors, SDL_Color * colors)
{
    int        i ;
    GR_PALETTE pal ;

    Dprintf ("enter NX_SetColors\n") ;

    if (ncolors > 256) return 0 ;
    
    pal.count = ncolors ;
    for (i = 0; i < ncolors; ++ i) {
        pal.palette [i].r = colors [i].r ;
        pal.palette [i].g = colors [i].g ;
        pal.palette [i].b = colors [i].b ;
    }
    GrSetSystemPalette (firstcolor, & pal) ;

    Dprintf ("leave NX_SetColors\n") ;
    return 1 ;
}

static int NX_ToggleFullScreen (_THIS, int on)
{
    SDL_Rect rect ;
    Uint32   event_thread ;
    
    Dprintf ("enter NX_ToggleFullScreen\n") ;

    // Don't switch if we don't own the window
    if (SDL_windowid) return 0 ;
    
    // Don't lock if we are the event thread
    event_thread = SDL_EventThreadID () ;
    if (event_thread && (SDL_ThreadID () == event_thread)) {
        event_thread = 0 ;
    }
    if (event_thread) {
        SDL_Lock_EventThread() ;
    }
    
    if (on) {
        NX_EnterFullScreen (this) ;
    } else {
        this -> screen -> flags &= ~ SDL_FULLSCREEN ;
        NX_LeaveFullScreen (this) ;
    }

    rect.x = rect.y = 0 ;
    rect.w = this -> screen -> w, rect.h = this -> screen -> h ;
    NX_NormalUpdate (this, 1, & rect) ;

    if (event_thread) {
        SDL_Unlock_EventThread () ;
    }
    
    Dprintf ("leave NX_ToggleFullScreen\n") ;
    return 1 ;
}

// Update the current mouse state and position
static void NX_UpdateMouse (_THIS)
{
    int            x, y ;
    GR_WINDOW_INFO info ;
    GR_SCREEN_INFO si ;


    Dprintf ("enter NX_UpdateMouse\n") ;

    // Lock the event thread, in multi-threading environments
    SDL_Lock_EventThread () ;
    
    GrGetScreenInfo (& si) ;
    GrGetWindowInfo (SDL_Window, & info) ;
    x = si.xpos - info.x ;
    y = si.ypos - info.y ;
    if (x >= 0 && x <= info.width && y >= 0 && y <= info.height) {
        SDL_PrivateAppActive (1, SDL_APPMOUSEFOCUS) ;
        SDL_PrivateMouseMotion (0, 0, x, y);
    } else {
        SDL_PrivateAppActive (0, SDL_APPMOUSEFOCUS) ;
    }

    SDL_Unlock_EventThread () ;
    Dprintf ("leave NX_UpdateMouse\n") ;
}

static int NX_SetGammaRamp (_THIS, Uint16 * ramp)
{
    int i ;
    Uint16 * red, * green, * blue ;
    
    Dprintf ("enter NX_SetGammaRamp\n") ;
    
    if (SDL_Visual.bpp != 32 && SDL_Visual.bpp != 24) return -1 ;

    if (! GammaRamp_R) GammaRamp_R = (Uint16 *) malloc (sizeof (Uint16) * CI_SIZE) ;
    if (! GammaRamp_G) GammaRamp_G = (Uint16 *) malloc (sizeof (Uint16) * CI_SIZE) ;
    if (! GammaRamp_B) GammaRamp_B = (Uint16 *) malloc (sizeof (Uint16) * CI_SIZE) ;
    if ((! GammaRamp_R) || (! GammaRamp_G) || (! GammaRamp_B)) {
        SDL_OutOfMemory () ;
        return -1 ;
    }

    for (i = 0; i < CI_SIZE; ++ i)
        GammaRamp_R [i] = GammaRamp_G [i] = GammaRamp_B [i] = i ;

    red   = ramp ;
    green = ramp + CI_SIZE ;
    blue  = green + CI_SIZE ;
        
    for (i = 0; i < CI_SIZE; ++ i) {
        GammaRamp_R [i] = red   [i] ;
        GammaRamp_G [i] = green [i] ;
        GammaRamp_B [i] = blue  [i] ;
    }

    Dprintf ("leave NX_SetGammaRamp\n") ;   
    return 0 ;
}

static int NX_GetGammaRamp (_THIS, Uint16 * ramp)
{
    int i ;
    Uint16 * red, * green, * blue ;

    Dprintf ("enter NX_GetGammaRamp\n") ;   

    if (SDL_Visual.bpp != 32 && SDL_Visual.bpp != 24) return -1 ;
    red   = ramp ;
    green = ramp  + CI_SIZE ;
    blue  = green + CI_SIZE ;
    if (GammaRamp_R && GammaRamp_G && GammaRamp_B) {
        for (i = 0; i < CI_SIZE; ++ i) {
            red   [i] = GammaRamp_R [i] ;
            green [i] = GammaRamp_G [i] ;
            blue  [i] = GammaRamp_B [i] ;
        }
    } else {
        for (i = 0; i < CI_SIZE; ++ i)
            red [i] = green [i] = blue [i] = i ;
    }

    Dprintf ("leave NX_GetGammaRamp\n") ;
    return 0 ;
}