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This commit essentially ensures before writing .blend file that only actualy locally used linked IDs are tagged as `LIB_TAG_EXTERN` (and therefore get a reference stored in the .blend file). Previously, a linked ID tagged as directly linked would never get back to the indirectly linked status. Consequence was a lot of 'needless' references to linked data in .blend files. This commit also introduces a new flag for lib_query ID usage types, `IDWALK_CB_DIRECT_WEAK_LINK`, used currently for base's Object pointer, and for LayerCollection's Collection pointer. NOTE: A side-effect of this patch is that even IDs explicitely linked by the user won't be kept anymore when writing files, i.e. they will not be there anymore after a file reload, if they are not actually used. Overhead of new process is below 0.1% in whole file saving process in a Heist production file e.g. Reviewed By: brecht Differential Revision: https://developer.blender.org/D16605
.. Keep this document short & concise, linking to external resources instead of including content in-line. See 'release/text/readme.html' for the end user read-me. Blender ======= Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing. .. figure:: https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg :scale: 50 % :align: center Project Pages ------------- - `Main Website <http://www.blender.org>`__ - `Reference Manual <https://docs.blender.org/manual/en/latest/index.html>`__ - `User Community <https://www.blender.org/community/>`__ Development ----------- - `Build Instructions <https://wiki.blender.org/wiki/Building_Blender>`__ - `Code Review & Bug Tracker <https://developer.blender.org>`__ - `Developer Forum <https://devtalk.blender.org>`__ - `Developer Documentation <https://wiki.blender.org>`__ License ------- Blender as a whole is licensed under the GNU General Public License, Version 3. Individual files may have a different, but compatible license. See `blender.org/about/license <https://www.blender.org/about/license>`__ for details.