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bo-graduation/venv/lib/python3.7/site-packages/PIL/GifImagePlugin.py

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#
# The Python Imaging Library.
# $Id$
#
# GIF file handling
#
# History:
# 1995-09-01 fl Created
# 1996-12-14 fl Added interlace support
# 1996-12-30 fl Added animation support
# 1997-01-05 fl Added write support, fixed local colour map bug
# 1997-02-23 fl Make sure to load raster data in getdata()
# 1997-07-05 fl Support external decoder (0.4)
# 1998-07-09 fl Handle all modes when saving (0.5)
# 1998-07-15 fl Renamed offset attribute to avoid name clash
# 2001-04-16 fl Added rewind support (seek to frame 0) (0.6)
# 2001-04-17 fl Added palette optimization (0.7)
# 2002-06-06 fl Added transparency support for save (0.8)
# 2004-02-24 fl Disable interlacing for small images
#
# Copyright (c) 1997-2004 by Secret Labs AB
# Copyright (c) 1995-2004 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#
import itertools
import math
import os
import subprocess
from . import Image, ImageChops, ImageFile, ImagePalette, ImageSequence
from ._binary import i8, i16le as i16, o8, o16le as o16
# --------------------------------------------------------------------
# Identify/read GIF files
def _accept(prefix):
return prefix[:6] in [b"GIF87a", b"GIF89a"]
##
# Image plugin for GIF images. This plugin supports both GIF87 and
# GIF89 images.
class GifImageFile(ImageFile.ImageFile):
format = "GIF"
format_description = "Compuserve GIF"
_close_exclusive_fp_after_loading = False
global_palette = None
def data(self):
s = self.fp.read(1)
if s and i8(s):
return self.fp.read(i8(s))
return None
def _open(self):
# Screen
s = self.fp.read(13)
if s[:6] not in [b"GIF87a", b"GIF89a"]:
raise SyntaxError("not a GIF file")
self.info["version"] = s[:6]
self._size = i16(s[6:]), i16(s[8:])
self.tile = []
flags = i8(s[10])
bits = (flags & 7) + 1
if flags & 128:
# get global palette
self.info["background"] = i8(s[11])
# check if palette contains colour indices
p = self.fp.read(3 << bits)
for i in range(0, len(p), 3):
if not (i // 3 == i8(p[i]) == i8(p[i + 1]) == i8(p[i + 2])):
p = ImagePalette.raw("RGB", p)
self.global_palette = self.palette = p
break
self.__fp = self.fp # FIXME: hack
self.__rewind = self.fp.tell()
self._n_frames = None
self._is_animated = None
self._seek(0) # get ready to read first frame
@property
def n_frames(self):
if self._n_frames is None:
current = self.tell()
try:
while True:
self.seek(self.tell() + 1)
except EOFError:
self._n_frames = self.tell() + 1
self.seek(current)
return self._n_frames
@property
def is_animated(self):
if self._is_animated is None:
if self._n_frames is not None:
self._is_animated = self._n_frames != 1
else:
current = self.tell()
try:
self.seek(1)
self._is_animated = True
except EOFError:
self._is_animated = False
self.seek(current)
return self._is_animated
def seek(self, frame):
if not self._seek_check(frame):
return
if frame < self.__frame:
if frame != 0:
self.im = None
self._seek(0)
last_frame = self.__frame
for f in range(self.__frame + 1, frame + 1):
try:
self._seek(f)
except EOFError:
self.seek(last_frame)
raise EOFError("no more images in GIF file")
def _seek(self, frame):
if frame == 0:
# rewind
self.__offset = 0
self.dispose = None
self.dispose_extent = [0, 0, 0, 0] # x0, y0, x1, y1
self.__frame = -1
self.__fp.seek(self.__rewind)
self._prev_im = None
self.disposal_method = 0
else:
# ensure that the previous frame was loaded
if not self.im:
self.load()
if frame != self.__frame + 1:
raise ValueError("cannot seek to frame %d" % frame)
self.__frame = frame
self.tile = []
self.fp = self.__fp
if self.__offset:
# backup to last frame
self.fp.seek(self.__offset)
while self.data():
pass
self.__offset = 0
if self.dispose:
self.im.paste(self.dispose, self.dispose_extent)
from copy import copy
self.palette = copy(self.global_palette)
info = {}
while True:
s = self.fp.read(1)
if not s or s == b";":
break
elif s == b"!":
#
# extensions
#
s = self.fp.read(1)
block = self.data()
if i8(s) == 249:
#
# graphic control extension
#
flags = i8(block[0])
if flags & 1:
info["transparency"] = i8(block[3])
info["duration"] = i16(block[1:3]) * 10
# disposal method - find the value of bits 4 - 6
dispose_bits = 0b00011100 & flags
dispose_bits = dispose_bits >> 2
if dispose_bits:
# only set the dispose if it is not
# unspecified. I'm not sure if this is
# correct, but it seems to prevent the last
# frame from looking odd for some animations
self.disposal_method = dispose_bits
elif i8(s) == 254:
#
# comment extension
#
while block:
if "comment" in info:
info["comment"] += block
else:
info["comment"] = block
block = self.data()
continue
elif i8(s) == 255:
#
# application extension
#
info["extension"] = block, self.fp.tell()
if block[:11] == b"NETSCAPE2.0":
block = self.data()
if len(block) >= 3 and i8(block[0]) == 1:
info["loop"] = i16(block[1:3])
while self.data():
pass
elif s == b",":
#
# local image
#
s = self.fp.read(9)
# extent
x0, y0 = i16(s[0:]), i16(s[2:])
x1, y1 = x0 + i16(s[4:]), y0 + i16(s[6:])
if x1 > self.size[0] or y1 > self.size[1]:
self._size = max(x1, self.size[0]), max(y1, self.size[1])
self.dispose_extent = x0, y0, x1, y1
flags = i8(s[8])
interlace = (flags & 64) != 0
if flags & 128:
bits = (flags & 7) + 1
self.palette = ImagePalette.raw("RGB", self.fp.read(3 << bits))
# image data
bits = i8(self.fp.read(1))
self.__offset = self.fp.tell()
self.tile = [
("gif", (x0, y0, x1, y1), self.__offset, (bits, interlace))
]
break
else:
pass
# raise IOError, "illegal GIF tag `%x`" % i8(s)
try:
if self.disposal_method < 2:
# do not dispose or none specified
self.dispose = None
elif self.disposal_method == 2:
# replace with background colour
Image._decompression_bomb_check(self.size)
self.dispose = Image.core.fill("P", self.size, self.info["background"])
else:
# replace with previous contents
if self.im:
self.dispose = self.im.copy()
# only dispose the extent in this frame
if self.dispose:
self.dispose = self._crop(self.dispose, self.dispose_extent)
except (AttributeError, KeyError):
pass
if not self.tile:
# self.__fp = None
raise EOFError
for k in ["transparency", "duration", "comment", "extension", "loop"]:
if k in info:
self.info[k] = info[k]
elif k in self.info:
del self.info[k]
self.mode = "L"
if self.palette:
self.mode = "P"
def tell(self):
return self.__frame
def load_end(self):
ImageFile.ImageFile.load_end(self)
# if the disposal method is 'do not dispose', transparent
# pixels should show the content of the previous frame
if self._prev_im and self.disposal_method == 1:
# we do this by pasting the updated area onto the previous
# frame which we then use as the current image content
updated = self._crop(self.im, self.dispose_extent)
self._prev_im.paste(updated, self.dispose_extent, updated.convert("RGBA"))
self.im = self._prev_im
self._prev_im = self.im.copy()
def _close__fp(self):
try:
if self.__fp != self.fp:
self.__fp.close()
except AttributeError:
pass
finally:
self.__fp = None
# --------------------------------------------------------------------
# Write GIF files
RAWMODE = {"1": "L", "L": "L", "P": "P"}
def _normalize_mode(im, initial_call=False):
"""
Takes an image (or frame), returns an image in a mode that is appropriate
for saving in a Gif.
It may return the original image, or it may return an image converted to
palette or 'L' mode.
UNDONE: What is the point of mucking with the initial call palette, for
an image that shouldn't have a palette, or it would be a mode 'P' and
get returned in the RAWMODE clause.
:param im: Image object
:param initial_call: Default false, set to true for a single frame.
:returns: Image object
"""
if im.mode in RAWMODE:
im.load()
return im
if Image.getmodebase(im.mode) == "RGB":
if initial_call:
palette_size = 256
if im.palette:
palette_size = len(im.palette.getdata()[1]) // 3
return im.convert("P", palette=Image.ADAPTIVE, colors=palette_size)
else:
return im.convert("P")
return im.convert("L")
def _normalize_palette(im, palette, info):
"""
Normalizes the palette for image.
- Sets the palette to the incoming palette, if provided.
- Ensures that there's a palette for L mode images
- Optimizes the palette if necessary/desired.
:param im: Image object
:param palette: bytes object containing the source palette, or ....
:param info: encoderinfo
:returns: Image object
"""
source_palette = None
if palette:
# a bytes palette
if isinstance(palette, (bytes, bytearray, list)):
source_palette = bytearray(palette[:768])
if isinstance(palette, ImagePalette.ImagePalette):
source_palette = bytearray(
itertools.chain.from_iterable(
zip(
palette.palette[:256],
palette.palette[256:512],
palette.palette[512:768],
)
)
)
if im.mode == "P":
if not source_palette:
source_palette = im.im.getpalette("RGB")[:768]
else: # L-mode
if not source_palette:
source_palette = bytearray(i // 3 for i in range(768))
im.palette = ImagePalette.ImagePalette("RGB", palette=source_palette)
used_palette_colors = _get_optimize(im, info)
if used_palette_colors is not None:
return im.remap_palette(used_palette_colors, source_palette)
im.palette.palette = source_palette
return im
def _write_single_frame(im, fp, palette):
im_out = _normalize_mode(im, True)
for k, v in im_out.info.items():
im.encoderinfo.setdefault(k, v)
im_out = _normalize_palette(im_out, palette, im.encoderinfo)
for s in _get_global_header(im_out, im.encoderinfo):
fp.write(s)
# local image header
flags = 0
if get_interlace(im):
flags = flags | 64
_write_local_header(fp, im, (0, 0), flags)
im_out.encoderconfig = (8, get_interlace(im))
ImageFile._save(im_out, fp, [("gif", (0, 0) + im.size, 0, RAWMODE[im_out.mode])])
fp.write(b"\0") # end of image data
def _write_multiple_frames(im, fp, palette):
duration = im.encoderinfo.get("duration", im.info.get("duration"))
disposal = im.encoderinfo.get("disposal", im.info.get("disposal"))
im_frames = []
frame_count = 0
background_im = None
for imSequence in itertools.chain([im], im.encoderinfo.get("append_images", [])):
for im_frame in ImageSequence.Iterator(imSequence):
# a copy is required here since seek can still mutate the image
im_frame = _normalize_mode(im_frame.copy())
if frame_count == 0:
for k, v in im_frame.info.items():
im.encoderinfo.setdefault(k, v)
im_frame = _normalize_palette(im_frame, palette, im.encoderinfo)
encoderinfo = im.encoderinfo.copy()
if isinstance(duration, (list, tuple)):
encoderinfo["duration"] = duration[frame_count]
if isinstance(disposal, (list, tuple)):
encoderinfo["disposal"] = disposal[frame_count]
frame_count += 1
if im_frames:
# delta frame
previous = im_frames[-1]
if encoderinfo.get("disposal") == 2:
if background_im is None:
background = _get_background(
im,
im.encoderinfo.get("background", im.info.get("background")),
)
background_im = Image.new("P", im_frame.size, background)
background_im.putpalette(im_frames[0]["im"].palette)
base_im = background_im
else:
base_im = previous["im"]
if _get_palette_bytes(im_frame) == _get_palette_bytes(base_im):
delta = ImageChops.subtract_modulo(im_frame, base_im)
else:
delta = ImageChops.subtract_modulo(
im_frame.convert("RGB"), base_im.convert("RGB")
)
bbox = delta.getbbox()
if not bbox:
# This frame is identical to the previous frame
if duration:
previous["encoderinfo"]["duration"] += encoderinfo["duration"]
continue
else:
bbox = None
im_frames.append({"im": im_frame, "bbox": bbox, "encoderinfo": encoderinfo})
if len(im_frames) > 1:
for frame_data in im_frames:
im_frame = frame_data["im"]
if not frame_data["bbox"]:
# global header
for s in _get_global_header(im_frame, frame_data["encoderinfo"]):
fp.write(s)
offset = (0, 0)
else:
# compress difference
frame_data["encoderinfo"]["include_color_table"] = True
im_frame = im_frame.crop(frame_data["bbox"])
offset = frame_data["bbox"][:2]
_write_frame_data(fp, im_frame, offset, frame_data["encoderinfo"])
return True
elif "duration" in im.encoderinfo and isinstance(
im.encoderinfo["duration"], (list, tuple)
):
# Since multiple frames will not be written, add together the frame durations
im.encoderinfo["duration"] = sum(im.encoderinfo["duration"])
def _save_all(im, fp, filename):
_save(im, fp, filename, save_all=True)
def _save(im, fp, filename, save_all=False):
# header
if "palette" in im.encoderinfo or "palette" in im.info:
palette = im.encoderinfo.get("palette", im.info.get("palette"))
else:
palette = None
im.encoderinfo["optimize"] = im.encoderinfo.get("optimize", True)
if not save_all or not _write_multiple_frames(im, fp, palette):
_write_single_frame(im, fp, palette)
fp.write(b";") # end of file
if hasattr(fp, "flush"):
fp.flush()
def get_interlace(im):
interlace = im.encoderinfo.get("interlace", 1)
# workaround for @PIL153
if min(im.size) < 16:
interlace = 0
return interlace
def _write_local_header(fp, im, offset, flags):
transparent_color_exists = False
try:
transparency = im.encoderinfo["transparency"]
except KeyError:
pass
else:
transparency = int(transparency)
# optimize the block away if transparent color is not used
transparent_color_exists = True
used_palette_colors = _get_optimize(im, im.encoderinfo)
if used_palette_colors is not None:
# adjust the transparency index after optimize
try:
transparency = used_palette_colors.index(transparency)
except ValueError:
transparent_color_exists = False
if "duration" in im.encoderinfo:
duration = int(im.encoderinfo["duration"] / 10)
else:
duration = 0
disposal = int(im.encoderinfo.get("disposal", 0))
if transparent_color_exists or duration != 0 or disposal:
packed_flag = 1 if transparent_color_exists else 0
packed_flag |= disposal << 2
if not transparent_color_exists:
transparency = 0
fp.write(
b"!"
+ o8(249) # extension intro
+ o8(4) # length
+ o8(packed_flag) # packed fields
+ o16(duration) # duration
+ o8(transparency) # transparency index
+ o8(0)
)
if "comment" in im.encoderinfo and 1 <= len(im.encoderinfo["comment"]):
fp.write(b"!" + o8(254)) # extension intro
comment = im.encoderinfo["comment"]
if isinstance(comment, str):
comment = comment.encode()
for i in range(0, len(comment), 255):
subblock = comment[i : i + 255]
fp.write(o8(len(subblock)) + subblock)
fp.write(o8(0))
if "loop" in im.encoderinfo:
number_of_loops = im.encoderinfo["loop"]
fp.write(
b"!"
+ o8(255) # extension intro
+ o8(11)
+ b"NETSCAPE2.0"
+ o8(3)
+ o8(1)
+ o16(number_of_loops) # number of loops
+ o8(0)
)
include_color_table = im.encoderinfo.get("include_color_table")
if include_color_table:
palette_bytes = _get_palette_bytes(im)
color_table_size = _get_color_table_size(palette_bytes)
if color_table_size:
flags = flags | 128 # local color table flag
flags = flags | color_table_size
fp.write(
b","
+ o16(offset[0]) # offset
+ o16(offset[1])
+ o16(im.size[0]) # size
+ o16(im.size[1])
+ o8(flags) # flags
)
if include_color_table and color_table_size:
fp.write(_get_header_palette(palette_bytes))
fp.write(o8(8)) # bits
def _save_netpbm(im, fp, filename):
# Unused by default.
# To use, uncomment the register_save call at the end of the file.
#
# If you need real GIF compression and/or RGB quantization, you
# can use the external NETPBM/PBMPLUS utilities. See comments
# below for information on how to enable this.
tempfile = im._dump()
try:
with open(filename, "wb") as f:
if im.mode != "RGB":
subprocess.check_call(
["ppmtogif", tempfile], stdout=f, stderr=subprocess.DEVNULL
)
else:
# Pipe ppmquant output into ppmtogif
# "ppmquant 256 %s | ppmtogif > %s" % (tempfile, filename)
quant_cmd = ["ppmquant", "256", tempfile]
togif_cmd = ["ppmtogif"]
quant_proc = subprocess.Popen(
quant_cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL
)
togif_proc = subprocess.Popen(
togif_cmd,
stdin=quant_proc.stdout,
stdout=f,
stderr=subprocess.DEVNULL,
)
# Allow ppmquant to receive SIGPIPE if ppmtogif exits
quant_proc.stdout.close()
retcode = quant_proc.wait()
if retcode:
raise subprocess.CalledProcessError(retcode, quant_cmd)
retcode = togif_proc.wait()
if retcode:
raise subprocess.CalledProcessError(retcode, togif_cmd)
finally:
try:
os.unlink(tempfile)
except OSError:
pass
# Force optimization so that we can test performance against
# cases where it took lots of memory and time previously.
_FORCE_OPTIMIZE = False
def _get_optimize(im, info):
"""
Palette optimization is a potentially expensive operation.
This function determines if the palette should be optimized using
some heuristics, then returns the list of palette entries in use.
:param im: Image object
:param info: encoderinfo
:returns: list of indexes of palette entries in use, or None
"""
if im.mode in ("P", "L") and info and info.get("optimize", 0):
# Potentially expensive operation.
# The palette saves 3 bytes per color not used, but palette
# lengths are restricted to 3*(2**N) bytes. Max saving would
# be 768 -> 6 bytes if we went all the way down to 2 colors.
# * If we're over 128 colors, we can't save any space.
# * If there aren't any holes, it's not worth collapsing.
# * If we have a 'large' image, the palette is in the noise.
# create the new palette if not every color is used
optimise = _FORCE_OPTIMIZE or im.mode == "L"
if optimise or im.width * im.height < 512 * 512:
# check which colors are used
used_palette_colors = []
for i, count in enumerate(im.histogram()):
if count:
used_palette_colors.append(i)
if optimise or (
len(used_palette_colors) <= 128
and max(used_palette_colors) > len(used_palette_colors)
):
return used_palette_colors
def _get_color_table_size(palette_bytes):
# calculate the palette size for the header
if not palette_bytes:
return 0
elif len(palette_bytes) < 9:
return 1
else:
return math.ceil(math.log(len(palette_bytes) // 3, 2)) - 1
def _get_header_palette(palette_bytes):
"""
Returns the palette, null padded to the next power of 2 (*3) bytes
suitable for direct inclusion in the GIF header
:param palette_bytes: Unpadded palette bytes, in RGBRGB form
:returns: Null padded palette
"""
color_table_size = _get_color_table_size(palette_bytes)
# add the missing amount of bytes
# the palette has to be 2<<n in size
actual_target_size_diff = (2 << color_table_size) - len(palette_bytes) // 3
if actual_target_size_diff > 0:
palette_bytes += o8(0) * 3 * actual_target_size_diff
return palette_bytes
def _get_palette_bytes(im):
"""
Gets the palette for inclusion in the gif header
:param im: Image object
:returns: Bytes, len<=768 suitable for inclusion in gif header
"""
return im.palette.palette
def _get_background(im, infoBackground):
background = 0
if infoBackground:
background = infoBackground
if isinstance(background, tuple):
# WebPImagePlugin stores an RGBA value in info["background"]
# So it must be converted to the same format as GifImagePlugin's
# info["background"] - a global color table index
background = im.palette.getcolor(background)
return background
def _get_global_header(im, info):
"""Return a list of strings representing a GIF header"""
# Header Block
# http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
version = b"87a"
for extensionKey in ["transparency", "duration", "loop", "comment"]:
if info and extensionKey in info:
if (extensionKey == "duration" and info[extensionKey] == 0) or (
extensionKey == "comment" and not (1 <= len(info[extensionKey]) <= 255)
):
continue
version = b"89a"
break
else:
if im.info.get("version") == b"89a":
version = b"89a"
background = _get_background(im, info.get("background"))
palette_bytes = _get_palette_bytes(im)
color_table_size = _get_color_table_size(palette_bytes)
return [
b"GIF" # signature
+ version # version
+ o16(im.size[0]) # canvas width
+ o16(im.size[1]), # canvas height
# Logical Screen Descriptor
# size of global color table + global color table flag
o8(color_table_size + 128), # packed fields
# background + reserved/aspect
o8(background) + o8(0),
# Global Color Table
_get_header_palette(palette_bytes),
]
def _write_frame_data(fp, im_frame, offset, params):
try:
im_frame.encoderinfo = params
# local image header
_write_local_header(fp, im_frame, offset, 0)
ImageFile._save(
im_frame, fp, [("gif", (0, 0) + im_frame.size, 0, RAWMODE[im_frame.mode])]
)
fp.write(b"\0") # end of image data
finally:
del im_frame.encoderinfo
# --------------------------------------------------------------------
# Legacy GIF utilities
def getheader(im, palette=None, info=None):
"""
Legacy Method to get Gif data from image.
Warning:: May modify image data.
:param im: Image object
:param palette: bytes object containing the source palette, or ....
:param info: encoderinfo
:returns: tuple of(list of header items, optimized palette)
"""
used_palette_colors = _get_optimize(im, info)
if info is None:
info = {}
if "background" not in info and "background" in im.info:
info["background"] = im.info["background"]
im_mod = _normalize_palette(im, palette, info)
im.palette = im_mod.palette
im.im = im_mod.im
header = _get_global_header(im, info)
return header, used_palette_colors
# To specify duration, add the time in milliseconds to getdata(),
# e.g. getdata(im_frame, duration=1000)
def getdata(im, offset=(0, 0), **params):
"""
Legacy Method
Return a list of strings representing this image.
The first string is a local image header, the rest contains
encoded image data.
:param im: Image object
:param offset: Tuple of (x, y) pixels. Defaults to (0,0)
:param \\**params: E.g. duration or other encoder info parameters
:returns: List of Bytes containing gif encoded frame data
"""
class Collector:
data = []
def write(self, data):
self.data.append(data)
im.load() # make sure raster data is available
fp = Collector()
_write_frame_data(fp, im, offset, params)
return fp.data
# --------------------------------------------------------------------
# Registry
Image.register_open(GifImageFile.format, GifImageFile, _accept)
Image.register_save(GifImageFile.format, _save)
Image.register_save_all(GifImageFile.format, _save_all)
Image.register_extension(GifImageFile.format, ".gif")
Image.register_mime(GifImageFile.format, "image/gif")
#
# Uncomment the following line if you wish to use NETPBM/PBMPLUS
# instead of the built-in "uncompressed" GIF encoder
# Image.register_save(GifImageFile.format, _save_netpbm)