Missing SDL_Palette support about libsdl2pp HOT 4 OPEN

Palette::Palette() : _id(0), _index(0) {
	common_palette = Resource::load(Resource::ResCommonPalette);
	if (common_palette.size() != 0x40 * 3)
		throw Exception("invalid palette.000 size: " + std::to_string(common_palette.size()));
	_palette = SDL_AllocPalette(256);
	if (!_palette)
		throw SDL2pp::Exception("SDL_AllocPalette");
}

void Palette::rotate() {
	++_index;
	SDL_Color colors[0x100];
	for(auto i = _ranges.begin(); i != _ranges.end(); ++i) {
		unsigned start = i->first, size = i->second;
		for(unsigned c = 0; c < size; ++c) {
			unsigned new_c = start + ((c - _index) % size);
			uint8_t *src = new_c >= 0xc0?
				common_palette.data() + (new_c - 0xc0) * 3:
				palette.data() + new_c * 3;
			SDL_Color &color = colors[c];
			color.r = *src++;
			color.g = *src++;
			color.b = *src++;
		}
		SDL_SetPaletteColors(_palette, colors, start, size);
	}
}


Palette::~Palette()
{ SDL_FreePalette(_palette); }