Method apply

mllm/preprocessor/visual/ImageTransform.cpp:30–50

Resize::Resize(int target_h, int target_w) : size_hw_(std::make_pair(target_h, target_w)) {}

Image Resize::apply(const Image& input) const {
  Image src = input;  // mutable copy
  if (size_hw_.has_value()) {
    // Explicit resize to (H, W)
    const int new_h = size_hw_->first;
    const int new_w = size_hw_->second;
    return src.resize(new_w, new_h);  // Image::resize expects (w, h)
  }

  // Shorter-side resize with aspect ratio preserved
  MLLM_RT_ASSERT(size_shorter_.has_value());
  const int target_shorter = *size_shorter_;
  const int h = src.h();
  const int w = src.w();

  const int shorter = std::min(h, w);
  const double scale = static_cast<double>(target_shorter) / static_cast<double>(shorter);
  const int new_h = static_cast<int>(std::round(h * scale));
  const int new_w = static_cast<int>(std::round(w * scale));
  return src.resize(new_w, new_h);
}

// ========================= CenterCrop =========================
CenterCrop::CenterCrop(int crop_size) : crop_h_(crop_size), crop_w_(crop_size) {}