Convert EA::Raster::ISurface*'s partly update (Code from EAWebKit-1.21) to SDL_Surface

convert_EAISurface_to_SDLSurface.cpp

static SDL_Surface * convert_EAISurface_to_SDLSurface(SDL_Surface * screen, EA::Raster::ISurface* easurface, int x, int y, int w, int h){    
    int stride = easurface->GetStride();
    typedef uint8_t Uint8;
    Uint8 *bits = (Uint8*)easurface->GetData() + y*stride + x*4;

    //The following code is mainly from "D:\SDL-1.2.15\test\testbitmap.c"(18,14):SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits)
    SDL_Surface *bitmap;
    Uint8 *line;    

    /* Allocate the bitmap */
    bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32, 0, 0, 0, 0);
    if ( bitmap == NULL ) {
        fprintf(stderr, "Couldn't allocate bitmap: %s\n",
            SDL_GetError());
        return(NULL);
    }

    /* Copy the pixels */
    line = (Uint8 *)bitmap->pixels;
    while ( h-- ) {
        memcpy(line, bits, w*4);
        line += bitmap->pitch;
        bits += stride;
    }
    return(bitmap);
}

//Outside caller:

void doViewUpdateRepaint(EA::Raster::ISurface* EAsurface, EA::WebKit::ViewUpdateInfo& view_update_info, SDL_Surface* SDLsurface){
    if( view_update_info.mDrawEvent == EA::WebKit::ViewUpdateInfo::kViewDrawEnd )
        return;
    int x = view_update_info.mX;
    int y = view_update_info.mY;
    int w = view_update_info.mW;
    int h = view_update_info.mH;
    SDL_Surface* bitmap = convert_EAISurface_to_SDLSurface(SDLsurface, EAsurface, x, y, w, h);
    SDL_Rect dst;
    dst.x = x;
    dst.y = y;
    dst.w = w;
    dst.h = h;
    SDL_BlitSurface(bitmap, NULL, SDLsurface, &dst);
    SDL_FreeSurface(bitmap);
    SDL_Flip(SDLsurface);
}