display_config.h

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#pragma once
 
// local includes
#include "display_device/windows/types.h"
 
// system includes
#include <cstddef>
#include <cstring>
 
namespace display_device::detail {
  [[nodiscard]] inline DISPLAYCONFIG_DESKTOP_IMAGE_INFO getDesktopImageInfo(const DISPLAYCONFIG_MODE_INFO &info) {
    constexpr std::size_t union_offset {offsetof(DISPLAYCONFIG_MODE_INFO, targetMode)};
    static_assert(sizeof(DISPLAYCONFIG_MODE_INFO) >= union_offset + sizeof(DISPLAYCONFIG_DESKTOP_IMAGE_INFO));
 
    DISPLAYCONFIG_DESKTOP_IMAGE_INFO desktop_image_info {};
    std::memcpy(&desktop_image_info, reinterpret_cast<const std::byte *>(&info) + union_offset, sizeof(desktop_image_info));
 
    return desktop_image_info;
  }
 
  inline void setDesktopImageInfo(DISPLAYCONFIG_MODE_INFO &info, const DISPLAYCONFIG_DESKTOP_IMAGE_INFO &desktop_image_info) {
    constexpr std::size_t union_offset {offsetof(DISPLAYCONFIG_MODE_INFO, targetMode)};
    static_assert(sizeof(DISPLAYCONFIG_MODE_INFO) >= union_offset + sizeof(DISPLAYCONFIG_DESKTOP_IMAGE_INFO));
 
    std::memcpy(reinterpret_cast<std::byte *>(&info) + union_offset, &desktop_image_info, sizeof(desktop_image_info));
  }
}  // namespace display_device::detail