def test_decompress_by_name(self):
for x in ("foo", "lz4XX", "zli"):
try:
compression.decompress_by_name(b"foo", x)
except Exception:
pass
else:
raise Exception("%s is not a valid compression" % x)
def process_delta(self, raw_data, width, height, rowstride, options):
"""
Can be called from any thread, decompresses and xors the rgb raw_data,
then stores it for later xoring if needed.
"""
img_data = raw_data
if options:
#check for one of the compressors:
comp = [x for x in compression.ALL_COMPRESSORS if options.intget(x, 0)]
if comp:
assert len(comp)==1, "more than one compressor specified: %s" % str(comp)
img_data = compression.decompress_by_name(raw_data, algo=comp[0])
if len(img_data)!=rowstride * height:
log.error("invalid img data %s: %s", type(img_data), str(img_data)[:256])
raise Exception("expected %s bytes for %sx%s with rowstride=%s but received %s (%s compressed)" %
(rowstride * height, width, height, rowstride, len(img_data), len(raw_data)))
delta = options.intget("delta", -1)
rgb_data = img_data
if delta>=0:
if not self._last_pixmap_data:
raise Exception("delta region references pixmap data we do not have!")
if xor_str is None:
raise Exception("received a delta region but we do not support delta encoding!")
lwidth, lheight, store, ldata = self._last_pixmap_data
assert width==lwidth and height==lheight and delta==store
rgb_data = xor_str(img_data, ldata)
#store new pixels for next delta:
store = options.intget("store", -1)
if store>=0:
self._last_pixmap_data = width, height, store, rgb_data
return rgb_data
def test_compressed_wrapper(self):
r = compression.compressed_wrapper("test", b"a"*(compression.MIN_COMPRESS_SIZE+1))
if not r.datatype.startswith("raw"):
raise Exception("should not be able to use the wrapper without enabling a compressor, but got %s" % r)
for x in ("lz4", "brotli", "zlib", "none"):
if not compression.use(x):
continue
kwargs = {x : True}
for level in (0, 1, 5, 10):
for data in (
b"0"*1024,
b"0"*16,
b"\0",
memoryview(b"hello"),
bytearray(b"hello"),
b"1"*1024*1024*16,
):
v = compression.compressed_wrapper("test", data, level=level, **kwargs)
assert v
assert repr(v)
assert compression.get_compression_type(v.level)
#and back:
try:
d = compression.decompress_by_name(v.data, v.algorithm)
assert d
if x!="none":
#we can't do none,
#because it would be mistaken for "zlib"
#(for historical reasons - 'zlib' uses level=0, and 'none' has no level)
d = compression.decompress(v.data, v.level)
assert d
except Exception:
print("error decompressing %s - generated with settings: %s" % (v, kwargs))
raise
def process_delta(self, raw_data, width, height, rowstride, options):
"""
Can be called from any thread, decompresses and xors the rgb raw_data,
then stores it for later xoring if needed.
"""
img_data = raw_data
if options:
#check for one of the compressors:
comp = [x for x in compression.ALL_COMPRESSORS if options.intget(x, 0)]
if comp:
assert len(comp)==1, "more than one compressor specified: %s" % str(comp)
img_data = compression.decompress_by_name(raw_data, algo=comp[0])
if len(img_data)!=rowstride * height:
log.error("invalid img data %s: %s", type(img_data), str(img_data)[:256])
raise Exception("expected %s bytes for %sx%s with rowstride=%s but received %s (%s compressed)" %
(rowstride * height, width, height, rowstride, len(img_data), len(raw_data)))
delta = options.intget("delta", -1)
bucket = options.intget("bucket", 0)
rgb_data = img_data
if delta>=0:
assert bucket>=0 and bucket<DELTA_BUCKETS, "invalid delta bucket number: %s" % bucket
if self._delta_pixel_data[bucket] is None:
raise Exception("delta region bucket %s references pixmap data we do not have!" % bucket)
lwidth, lheight, seq, ldata = self._delta_pixel_data[bucket]
assert width==lwidth and height==lheight and delta==seq, "delta bucket %s data does not match: expected %s but got %s" % (bucket, (width, height, delta), (lwidth, lheight, seq))
deltalog("delta: xoring with bucket %i", bucket)
rgb_data = xor_str(img_data, ldata)
#store new pixels for next delta:
store = options.intget("store", -1)
if store>=0:
deltalog("delta: storing sequence %i in bucket %i", store, bucket)
self._delta_pixel_data[bucket] = width, height, store, rgb_data
return rgb_data
def uncompress_data(self, data, metadata):
if not data or not metadata:
return data
compress = metadata.get("compress")
if not compress:
return data
assert compress in ("lz4", "lzo")
v = decompress_by_name(data, compress)
#log("decompressed %s data: %i bytes into %i bytes", compress, len(data), len(v))
return v
def uncompress_data(self, data, metadata):
if not data or not metadata:
return data
compress = metadata.get("compress")
if not compress:
return data
assert compress in ("lz4", "lzo")
v = decompress_by_name(data, compress)
#log("decompressed %s data: %i bytes into %i bytes", compress, len(data), len(v))
return v
def paint_rgb(self, rgb_format, raw_data, x, y, width, height, rowstride, options, callbacks):
""" can be called from a non-UI thread """
iwidth, iheight = options.intpair("scaled-size", (width, height))
#was a compressor used?
comp = tuple(x for x in compression.ALL_COMPRESSORS if options.intget(x, 0))
if comp:
assert len(comp)==1, "more than one compressor specified: %s" % str(comp)
rgb_data = compression.decompress_by_name(raw_data, algo=comp[0])
else:
rgb_data = raw_data
self.idle_add(self.do_paint_rgb, rgb_format, rgb_data,
x, y, iwidth, iheight, width, height, rowstride, options, callbacks)
def process_delta(self, raw_data, width, height, rowstride, options):
"""
Can be called from any thread, decompresses and xors the rgb raw_data,
then stores it for later xoring if needed.
"""
img_data = raw_data
if options:
#check for one of the compressors:
comp = [
x for x in compression.ALL_COMPRESSORS if options.intget(x, 0)
]
if comp:
assert len(
comp
) == 1, "more than one compressor specified: %s" % str(comp)
img_data = compression.decompress_by_name(raw_data,
algo=comp[0])
if len(img_data) != rowstride * height:
deltalog.error(
"Error: invalid img data length: expected %s but got %s (%s: %s)",
rowstride * height, len(img_data), type(img_data),
repr_ellipsized(img_data))
raise Exception(
"expected %s bytes for %sx%s with rowstride=%s but received %s (%s compressed)"
% (rowstride * height, width, height, rowstride, len(img_data),
len(raw_data)))
delta = options.intget(b"delta", -1)
bucket = options.intget(b"bucket", 0)
rgb_format = options.strget(b"rgb_format")
rgb_data = img_data
if delta >= 0:
assert 0 <= bucket < DELTA_BUCKETS, "invalid delta bucket number: %s" % bucket
if self._delta_pixel_data[bucket] is None:
raise Exception(
"delta region bucket %s references pixmap data we do not have!"
% bucket)
lwidth, lheight, lrgb_format, seq, ldata = self._delta_pixel_data[
bucket]
assert width==lwidth and height==lheight and delta==seq, \
"delta bucket %s data does not match: expected %s but got %s" % (
bucket, (width, height, delta), (lwidth, lheight, seq))
assert lrgb_format == rgb_format, "delta region uses %s format, was expecting %s" % (
rgb_format, lrgb_format)
deltalog("delta: xoring with bucket %i", bucket)
rgb_data = xor_str(img_data, ldata)
#store new pixels for next delta:
store = options.intget("store", -1)
if store >= 0:
deltalog("delta: storing sequence %i in bucket %i", store, bucket)
self._delta_pixel_data[
bucket] = width, height, rgb_format, store, rgb_data
return rgb_data
