+ if (!_j2k || target_size != _j2k_target_size) {
+ int reduce = 0;
+
+ while (target_size && (_size.width / pow(2, reduce)) > target_size->width && (_size.height / pow(2, reduce)) > target_size->height) {
+ ++reduce;
+ }
+
+ --reduce;
+ reduce = max (0, reduce);
+ _j2k = dcp::decompress_j2k (const_cast<uint8_t*> (_data.data().get()), _data.size (), reduce);
+
+ if (_j2k->precision(0) < 12) {
+ int const shift = 12 - _j2k->precision (0);
+ for (int c = 0; c < 3; ++c) {
+ int* p = _j2k->data (c);
+ for (int y = 0; y < _j2k->size().height; ++y) {
+ for (int x = 0; x < _j2k->size().width; ++x) {
+ *p++ <<= shift;
+ }
+ }
+ }
+ }
+
+ _j2k_target_size = target_size;
+ }
+
+ shared_ptr<Image> image (new Image (_pixel_format, _j2k->size(), true));
+
+ /* Copy data in whatever format (sRGB or XYZ) into our Image; I'm assuming
+ the data is 12-bit either way.
+ */
+
+ int const width = _j2k->size().width;