ImageRec::ImageRec (ImageRec &img, int subimage_to_copy, int miplevel_to_copy, bool writable, bool copy_pixels) : m_name(img.name()), m_elaborated(true), m_metadata_modified(false), m_pixels_modified(false), m_was_output(false), m_imagecache(img.m_imagecache) { img.read (); int first_subimage = std::max (0, subimage_to_copy); int subimages = (subimage_to_copy < 0) ? img.subimages() : 1; m_subimages.resize (subimages); for (int s = 0; s < subimages; ++s) { int srcsub = s + first_subimage; int first_miplevel = std::max (0, miplevel_to_copy); int miplevels = (miplevel_to_copy < 0) ? img.miplevels(srcsub) : 1; m_subimages[s].m_miplevels.resize (miplevels); m_subimages[s].m_specs.resize (miplevels); for (int m = 0; m < miplevels; ++m) { int srcmip = m + first_miplevel; const ImageBuf &srcib (img(srcsub,srcmip)); const ImageSpec &srcspec (*img.spec(srcsub,srcmip)); ImageBuf *ib = NULL; if (writable || img.pixels_modified() || !copy_pixels) { // Make our own copy of the pixels ib = new ImageBuf (srcspec); if (copy_pixels) ib->copy_pixels (srcib); } else { // The other image is not modified, and we don't need to be // writable, either. ib = new ImageBuf (img.name(), srcib.imagecache()); bool ok = ib->read (srcsub, srcmip, false /*force*/, img.m_input_dataformat /*convert*/); ASSERT (ok); } m_subimages[s].m_miplevels[m].reset (ib); m_subimages[s].m_specs[m] = srcspec; } } }