Method blank

src/platform/linux/graphics.cpp:845–857

  }

  int sws_t::blank(gl::frame_buf_t &fb, int offsetX, int offsetY, int width, int height) {
    auto f = [&]() {
      std::swap(offsetX, this->offsetX);
      std::swap(offsetY, this->offsetY);
      std::swap(width, this->out_width);
      std::swap(height, this->out_height);
    };

    f();
    auto fg = util::fail_guard(f);

    return convert(fb);
  }

  std::optional<sws_t> sws_t::make(int in_width, int in_height, int out_width, int out_height, AVPixelFormat format) {
    GLint gl_format;