[Oiio-dev] Proper way to set ImageRead plugins attributes in c++?

[Vlad]

Hello.

I have question that not covered well in oiio documentation.

i have piece of code that read image
============================================
bool image_utils::load_image(
  const std::string& filepath,
  int& width,
  int& height,
  float*& pixels)
{
  OIIO::ImageInput::unique_ptr in;
  in = OIIO::ImageInput::open(filepath);
  if (in) {
    const OIIO::ImageSpec& spec = in->spec();
    width = spec.width;
    height = spec.height;

    const int image_len = width * height * IMAGE_CHANNELS_USED;
    pixels = (float*)malloc(sizeof(float) * image_len);
    if (!pixels) {
      return false;
    }

    if (in->read_image(0, 0, 0, IMAGE_CHANNELS_USED, OIIO::TypeDesc::FLOAT,
      pixels, OIIO::AutoStride, OIIO::AutoStride, OIIO::AutoStride,
      (*progress_callback))) {
      if (in->close()) {
        return true;
      }
    }
  }
  return false;
}
============================================

it work well with default options. But i need pass specific settings to
read Camera RAW images with Libraw plugin.

And can't make this work. This way not working, VC show me error.

============================================
 if (in) {
    const OIIO::ImageSpec& spec = in->spec();
    width = spec.width;
    height = spec.height;

    spec.attribute("raw:ColorSpace", "raw");

    const int image_len = width * height * IMAGE_CHANNELS_USED;

Using
 spec["raw:ColorSpace"] = "raw";
============================================

in same part of code compiled without errors but change nothing in open

Using
============================================
OIIO::attribute("raw:ColorSpace", "ACES");
============================================

inside this block or outside also do not change anything.

So what the correct way to define Plugin specific attributes?
Sorry, may be this is just my low skills in c++.

Best regards
Vlad

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