150 lines
5.8 KiB
Python
150 lines
5.8 KiB
Python
"""Expand data blocks.
|
|
|
|
The expansion process follows pointers and library links to construct the full
|
|
set of actually-used data blocks. This set consists of all data blocks in the
|
|
initial blend file, and all *actually linked-to* data blocks in linked
|
|
blend files.
|
|
"""
|
|
import collections
|
|
import logging
|
|
import typing
|
|
|
|
from blender_asset_tracer import blendfile, bpathlib
|
|
from . import expanders
|
|
|
|
_funcs_for_code = {}
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class _BlockIterator:
|
|
"""Expand blocks with dependencies from other libraries.
|
|
|
|
This class exists so that we have some context for the recursive expansion
|
|
without having to pass those variables to each recursive call.
|
|
"""
|
|
|
|
def __init__(self):
|
|
# Set of (blend file Path, block address) of already-reported blocks.
|
|
self.blocks_yielded = set()
|
|
|
|
# Queue of blocks to visit
|
|
self.to_visit = collections.deque()
|
|
|
|
def iter_blocks(self,
|
|
bfile: blendfile.BlendFile,
|
|
limit_to: typing.Set[blendfile.BlendFileBlock] = frozenset(),
|
|
) -> typing.Iterator[blendfile.BlendFileBlock]:
|
|
"""Expand blocks with dependencies from other libraries."""
|
|
if limit_to:
|
|
self._queue_named_blocks(bfile, limit_to)
|
|
else:
|
|
self._queue_all_blocks(bfile)
|
|
|
|
blocks_per_lib = yield from self._visit_blocks(bfile, limit_to)
|
|
yield from self._visit_linked_blocks(blocks_per_lib)
|
|
|
|
def _visit_blocks(self, bfile, limit_to):
|
|
bpath = bfile.filepath.absolute().resolve()
|
|
root_dir = bpathlib.BlendPath(bpath.parent)
|
|
|
|
# Mapping from library path to data blocks to expand.
|
|
blocks_per_lib = collections.defaultdict(set)
|
|
|
|
while self.to_visit:
|
|
block = self.to_visit.popleft()
|
|
assert isinstance(block, blendfile.BlendFileBlock)
|
|
if (bpath, block.addr_old) in self.blocks_yielded:
|
|
continue
|
|
|
|
if block.code == b'ID':
|
|
# ID blocks represent linked-in assets. Those are the ones that
|
|
# should be loaded from their own blend file and "expanded" to
|
|
# the entire set of data blocks required to render them. We
|
|
# defer the handling of those so that we can work with one
|
|
# blend file at a time.
|
|
lib = block.get_pointer(b'lib')
|
|
lib_bpath = bpathlib.BlendPath(lib[b'name']).absolute(root_dir)
|
|
blocks_per_lib[lib_bpath].add(block)
|
|
|
|
# The library block itself should also be reported, because it
|
|
# represents a blend file that is a dependency as well.
|
|
self.to_visit.append(lib)
|
|
continue
|
|
|
|
if limit_to:
|
|
# We're limiting the blocks, so we have to expand them to make
|
|
# sure we don't miss anything. Otherwise we're yielding the
|
|
# entire file anyway, and no expansion is necessary.
|
|
self._queue_dependencies(block)
|
|
self.blocks_yielded.add((bpath, block.addr_old))
|
|
yield block
|
|
|
|
return blocks_per_lib
|
|
|
|
def _visit_linked_blocks(self, blocks_per_lib):
|
|
# We've gone through all the blocks in this file, now open the libraries
|
|
# and iterate over the blocks referred there.
|
|
for lib_bpath, idblocks in blocks_per_lib.items():
|
|
lib_path = lib_bpath.to_path()
|
|
try:
|
|
lib_path = lib_path.resolve()
|
|
except FileNotFoundError:
|
|
log.warning('Library %s does not exist', lib_path)
|
|
continue
|
|
|
|
log.debug('Expanding %d blocks in %s', len(idblocks), lib_path)
|
|
libfile = blendfile.open_cached(lib_path)
|
|
yield from self.iter_blocks(libfile, idblocks)
|
|
|
|
def _queue_all_blocks(self, bfile: blendfile.BlendFile):
|
|
log.debug('Queueing all blocks from file %s', bfile.filepath)
|
|
# Don't bother visiting DATA blocks, as we won't know what
|
|
# to do with them anyway.
|
|
self.to_visit.extend(block for block in bfile.blocks
|
|
if block.code != b'DATA')
|
|
self._sort_queue()
|
|
|
|
def _queue_named_blocks(self,
|
|
bfile: blendfile.BlendFile,
|
|
limit_to: typing.Set[blendfile.BlendFileBlock]):
|
|
"""Queue only the blocks referred to in limit_to.
|
|
|
|
:param bfile:
|
|
:param limit_to: set of ID blocks that name the blocks to queue.
|
|
The queued blocks are loaded from the actual blend file, and
|
|
selected by name.
|
|
"""
|
|
|
|
for to_find in limit_to:
|
|
assert to_find.code == b'ID'
|
|
name_to_find = to_find[b'name']
|
|
code = name_to_find[:2]
|
|
log.debug('Finding block %r with code %r', name_to_find, code)
|
|
same_code = bfile.find_blocks_from_code(code)
|
|
for block in same_code:
|
|
if block.id_name == name_to_find:
|
|
log.debug('Queueing %r from file %s', block, bfile.filepath)
|
|
self.to_visit.append(block)
|
|
self._sort_queue()
|
|
|
|
def _queue_dependencies(self, block: blendfile.BlendFileBlock):
|
|
self.to_visit.extend(expanders.expand_block(block))
|
|
self._sort_queue()
|
|
|
|
def _sort_queue(self):
|
|
"""Sort the queued blocks by file and by offset.
|
|
|
|
This allows us to go through the blend files sequentially.
|
|
"""
|
|
|
|
def sort_key(block: blendfile.BlendFileBlock):
|
|
return block.bfile.filepath, block.file_offset
|
|
|
|
self.to_visit = collections.deque(sorted(self.to_visit, key=sort_key))
|
|
|
|
|
|
def iter_blocks(bfile: blendfile.BlendFile) -> typing.Iterator[blendfile.BlendFileBlock]:
|
|
"""Generator, yield all blocks in this file + required blocks in libs."""
|
|
bi = _BlockIterator()
|
|
yield from bi.iter_blocks(bfile)
|