sdl_blend_mode_guard.cpp

#include "sdl_blend_mode_guard.hpp"
 
SdlBlendModeGuard::SdlBlendModeGuard(const std::shared_ptr<SDL_Renderer>& renderer,
                                     SDL_BlendMode mode)
    : _renderer(renderer)
{
  const auto rcb = SDL_GetRenderDrawBlendMode(_renderer.get(), &_restore_mode);
  if (!rcb)
    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                "[%s] SDL_GetRenderDrawBlendMode() failed with %s", __func__, SDL_GetError());
  else
  {
    const auto rbm = SDL_SetRenderDrawBlendMode(_renderer.get(), mode);
    if (!rbm)
      SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                  "[%s] SDL_SetRenderDrawBlendMode() failed with %s", __func__,
                  SDL_GetError());
    else
      _current_mode = mode;
  }
}
 
bool SdlBlendModeGuard::update(SDL_BlendMode mode)
{
  if (_current_mode != mode)
  {
    if (!SDL_SetRenderDrawBlendMode(_renderer.get(), mode))
    {
      SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                  "[%s] SDL_SetRenderDrawBlendMode() failed with %s", __func__,
                  SDL_GetError());
      return false;
    }
    _current_mode = mode;
  }
  return true;
}
 
SdlBlendModeGuard::~SdlBlendModeGuard()
{
  const auto rbm = SDL_SetRenderDrawBlendMode(_renderer.get(), _restore_mode);
  if (!rbm)
    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                "[%s] SDL_SetRenderDrawBlendMode() failed with %s", __func__, SDL_GetError());
}