bool LoadImageData(Image *image, const int image_idx, std::string *err,
                   std::string *warn, int req_width, int req_height,
                   const unsigned char *bytes, int size, void *user_data) {
  (void)warn;

  LoadImageDataOption option;
  if (user_data) {
    option = *reinterpret_cast<LoadImageDataOption *>(user_data);
  }

  int w = 0, h = 0, comp = 0, req_comp = 0;

  unsigned char *data = nullptr;

  // preserve_channels true: Use channels stored in the image file.
  // false: force 32-bit textures for common Vulkan compatibility. It appears
  // that some GPU drivers do not support 24-bit images for Vulkan
  req_comp = option.preserve_channels ? 0 : 4;
  int bits = 8;
  int pixel_type = TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE;

  // It is possible that the image we want to load is a 16bit per channel image
  // We are going to attempt to load it as 16bit per channel, and if it worked,
  // set the image data accodingly. We are casting the returned pointer into
  // unsigned char, because we are representing "bytes". But we are updating
  // the Image metadata to signal that this image uses 2 bytes (16bits) per
  // channel:
  if (stbi_is_16_bit_from_memory(bytes, size)) {
    data = reinterpret_cast<unsigned char *>(
        stbi_load_16_from_memory(bytes, size, &w, &h, &comp, req_comp));
    if (data) {
      bits = 16;
      pixel_type = TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT;
    }
  }

  // at this point, if data is still NULL, it means that the image wasn't
  // 16bit per channel, we are going to load it as a normal 8bit per channel
  // mage as we used to do:
  // if image cannot be decoded, ignore parsing and keep it by its path
  // don't break in this case
  // FIXME we should only enter this function if the image is embedded. If
  // image->uri references
  // an image file, it should be left as it is. Image loading should not be
  // mandatory (to support other formats)
  if (!data) data = stbi_load_from_memory(bytes, size, &w, &h, &comp, req_comp);
  if (!data) {
    // NOTE: you can use `warn` instead of `err`
    if (err) {
      (*err) +=
          "Unknown image format. STB cannot decode image data for image[" +
          std::to_string(image_idx) + "] name = \"" + image->name + "\".\n";
    }
    return false;
  }

  if ((w < 1) || (h < 1)) {
    stbi_image_free(data);
    if (err) {
      (*err) += "Invalid image data for image[" + std::to_string(image_idx) +
                "] name = \"" + image->name + "\"\n";
    }
    return false;
  }

  if (req_width > 0) {
    if (req_width != w) {
      stbi_image_free(data);
      if (err) {
        (*err) += "Image width mismatch for image[" +
                  std::to_string(image_idx) + "] name = \"" + image->name +
                  "\"\n";
      }
      return false;
    }
  }

  if (req_height > 0) {
    if (req_height != h) {
      stbi_image_free(data);
      if (err) {
        (*err) += "Image height mismatch. for image[" +
                  std::to_string(image_idx) + "] name = \"" + image->name +
                  "\"\n";
      }
      return false;
    }
  }

  if (req_comp != 0) {
    // loaded data has `req_comp` channels(components)
    comp = req_comp;
  }

  image->width = w;
  image->height = h;
  image->component = comp;
  image->bits = bits;
  image->pixel_type = pixel_type;
  image->image.resize(static_cast<size_t>(w * h * comp) * size_t(bits / 8));
  std::copy(data, data + w * h * comp * (bits / 8), image->image.begin());
  stbi_image_free(data);

  return true;
}
bool LoadImageData(Image *image, const int image_idx, std::string *err,
                   std::string *warn, int req_width, int req_height,
                   const unsigned char *bytes, int size, void *user_data) {
  (void)warn;

  LoadImageDataOption option;
  if (user_data) {
    option = *reinterpret_cast<LoadImageDataOption *>(user_data);
  }

  int w = 0, h = 0, comp = 0, req_comp = 0;

  unsigned char *data = nullptr;

   
   
   
  req_comp = option.preserve_channels ? 0 : 4;
  int bits = 8;
  int pixel_type = TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE;

   
   
   
   
   
   
  if (stbi_is_16_bit_from_memory(bytes, size)) {
    data = reinterpret_cast<unsigned char *>(
        stbi_load_16_from_memory(bytes, size, &w, &h, &comp, req_comp));
    if (data) {
      bits = 16;
      pixel_type = TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT;
    }
  }

   
   
   
   
   
   
   
   
   
  if (!data) data = stbi_load_from_memory(bytes, size, &w, &h, &comp, req_comp);
  if (!data) {
     
    if (err) {
      (*err) +=
          "Unknown image format. STB cannot decode image data for image[" +
          std::to_string(image_idx) + "] name = \"" + image->name + "\".\n";
    }
    return false;
  }

  if ((w < 1) || (h < 1)) {
    stbi_image_free(data);
    if (err) {
      (*err) += "Invalid image data for image[" + std::to_string(image_idx) +
                "] name = \"" + image->name + "\"\n";
    }
    return false;
  }

  if (req_width > 0) {
    if (req_width != w) {
      stbi_image_free(data);
      if (err) {
        (*err) += "Image width mismatch for image[" +
                  std::to_string(image_idx) + "] name = \"" + image->name +
                  "\"\n";
      }
      return false;
    }
  }

  if (req_height > 0) {
    if (req_height != h) {
      stbi_image_free(data);
      if (err) {
        (*err) += "Image height mismatch. for image[" +
                  std::to_string(image_idx) + "] name = \"" + image->name +
                  "\"\n";
      }
      return false;
    }
  }

  if (req_comp != 0) {
     
    comp = req_comp;
  }

  image->width = w;
  image->height = h;
  image->component = comp;
  image->bits = bits;
  image->pixel_type = pixel_type;
  image->image.resize(static_cast<size_t>(w * h * comp) * size_t(bits / 8));
  std::copy(data, data + w * h * comp * (bits / 8), image->image.begin());
  stbi_image_free(data);

  return true;
}