std::vector<T> getCallbacks() {
   typename std::vector<T> result;
   result.reserve(functionList.size() - invalidIndexCount);
   for (typename TypedFunctionPointerWrapperRefVector<T>::type::iterator it = functionList.begin(); it != functionList.end(); it++) {
     if (*it) {
       result.push_back((*it)->callback);
     }
   }
   return result;
 }
Exemplo n.º 2
0
    template<typename T> void
    encodeImageToPNG (typename std::vector<T>& image_arg,
                      size_t width_arg,
                      size_t height_arg,
                      int image_format_arg,
                      typename std::vector<uint8_t>& pngData_arg,
                      int png_level_arg)
    {
      png_structp png_ptr;
      png_infop info_ptr;
      volatile int channels;

      if (image_arg.size () ==0)
        return;

      // Get amount of channels
      switch (image_format_arg)
       {
         case PNG_COLOR_TYPE_GRAY:
           channels = 1;
           break;
         case PNG_COLOR_TYPE_GRAY_ALPHA:
           channels = 2;
           break;
         case PNG_COLOR_TYPE_RGB:
           channels = 3;
           break;
         case PNG_COLOR_TYPE_RGB_ALPHA:
           channels = 4;
           break;
         default:
           channels = 0;
           break;
       }

      // Ensure valid input array
      assert (image_arg.size () == width_arg*height_arg*channels);

      // Initialize write structure
      png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, 0, 0, 0);
      assert (png_ptr && "creating png_create_write_structpng_create_write_struct failed");

      // Initialize info structure
      info_ptr = png_create_info_struct (png_ptr);
      assert (info_ptr && "Could not allocate info struct");

      // Setup Exception handling
      setjmp(png_jmpbuf(png_ptr));

      // reserve memory for output data (300kB)
      pngData_arg.clear ();
      pngData_arg.reserve (300 * 1024);

      // Define I/O methods
      png_set_write_fn (png_ptr, reinterpret_cast<void*> (&pngData_arg), 
                        user_write_data, user_flush_data);

      // Define zlib compression level
      if (png_level_arg >= 0)
      {
        png_set_compression_level (png_ptr, png_level_arg);
      }
      else
      {
        png_set_compression_level (png_ptr, Z_DEFAULT_COMPRESSION);
      }

      // Write header
      png_set_IHDR (png_ptr, info_ptr, width_arg, height_arg, sizeof(T) * 8,
          image_format_arg, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
          PNG_FILTER_TYPE_DEFAULT);

      png_write_info (png_ptr, info_ptr);

      // Write image data
      size_t y;
      for (y = 0; y < height_arg; y++)
      {
        png_write_row (png_ptr, reinterpret_cast<png_bytep> (&image_arg[y * width_arg * channels]));
      }

      // End write
      png_write_end (png_ptr, 0);

      if (info_ptr)
        png_free_data (png_ptr, info_ptr, PNG_FREE_ALL, -1);
      if (png_ptr)
        png_destroy_write_struct (&png_ptr, 0);
    }