Yalantis/uCrop · error · CImgArgumentException

CImg(): Invalid construction request of a shared instance…

Error message

CImg(): Invalid construction request of a shared instance from a CImg<%s> image (%u,%u,%u,%u,%p) (pixel types are different).

What it means

Thrown when constructing a shared CImg<T> copy from a CImg<t> source with a different pixel type t != T: sharing requires identical pixel buffers, so the shared-state constructor cannot alias memory across differing element types and reports the mismatched instance dimensions and pointer.

Solutions

1. Use the same pixel type on both sides, e.g. construct CImg<float> from another CImg<float> with is_shared=true
2. If types must differ, drop the shared requirement and use a regular copy constructor, which converts pixel values

When it happens

Trigger: Thrown at ucrop/src/main/jni/CImg.h:13466 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Yalantis/uCrop@f788b534b4 (2026-09-08). Data as JSON: /api/errors/c17fbc81edbe0c12. Report an issue: GitHub.

Appendix: source

Thrown at ucrop/src/main/jni/CImg.h:13466

    /**
       Construct a new image instance with pixels of type \c T, as a copy of an existing \c CImg<t> instance,
       while forcing the shared state of the constructed copy.
       \param img Input image to copy.
       \param is_shared Tells about the shared state of the constructed copy.
       \note
       - Similar to CImg(const CImg<t>&), except that it allows to decide the shared state of
         the constructed image, which does not depend anymore on the shared state of the input image \c img:
         - If \c is_shared is \c true, the constructed copy will share its pixel buffer with the input image \c img.
           For that case, the pixel types \c T and \c t \e must be the same.
         - If \c is_shared is \c false, the constructed copy will allocate its own pixel buffer, whether the input
           image \c img is shared or not.
       - A \c CImgArgumentException is thrown when a shared copy is requested with different pixel types \c T and \c t.
    **/
    template<typename t>
    CImg(const CImg<t>& img, const bool is_shared):_is_shared(false) {
      if (is_shared) {
        _width = _height = _depth = _spectrum = 0; _data = 0;
        throw CImgArgumentException(_cimg_instance
                                    "CImg(): Invalid construction request of a shared instance from a "
                                    "CImg<%s> image (%u,%u,%u,%u,%p) (pixel types are different).",
                                    cimg_instance,
                                    CImg<t>::pixel_type(),img._width,img._height,img._depth,img._spectrum,img._data);
      }
      const size_t siz = (size_t)img.size();
      if (img._data && siz) {
        _width = img._width; _height = img._height; _depth = img._depth; _spectrum = img._spectrum;
        try { _data = new T[siz]; } catch (...) {
          _width = _height = _depth = _spectrum = 0; _data = 0;
          throw CImgInstanceException(_cimg_instance
                                      "CImg(): Failed to allocate memory (%s) for image (%u,%u,%u,%u).",
                                      cimg_instance,
                                      cimg::strbuffersize(sizeof(T)*img._width*img._height*img._depth*img._spectrum),
                                      img._width,img._height,img._depth,img._spectrum);
        }
        const t *ptrs = img._data; cimg_for(*this,ptrd,T) *ptrd = (T)*(ptrs++);
      } else { _width = _height = _depth = _spectrum = 0; _data = 0; }

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