in infrastructure/pillow-layer/python/PIL/PngImagePlugin.py [0:0]
def _write_multiple_frames(im, fp, chunk, rawmode):
default_image = im.encoderinfo.get("default_image", im.info.get("default_image"))
duration = im.encoderinfo.get("duration", im.info.get("duration", 0))
loop = im.encoderinfo.get("loop", im.info.get("loop", 0))
disposal = im.encoderinfo.get("disposal", im.info.get("disposal"))
blend = im.encoderinfo.get("blend", im.info.get("blend"))
if default_image:
chain = itertools.chain(im.encoderinfo.get("append_images", []))
else:
chain = itertools.chain([im], im.encoderinfo.get("append_images", []))
im_frames = []
frame_count = 0
for im_seq in chain:
for im_frame in ImageSequence.Iterator(im_seq):
im_frame = im_frame.copy()
if im_frame.mode != im.mode:
if im.mode == "P":
im_frame = im_frame.convert(im.mode, palette=im.palette)
else:
im_frame = im_frame.convert(im.mode)
encoderinfo = im.encoderinfo.copy()
if isinstance(duration, (list, tuple)):
encoderinfo["duration"] = duration[frame_count]
if isinstance(disposal, (list, tuple)):
encoderinfo["disposal"] = disposal[frame_count]
if isinstance(blend, (list, tuple)):
encoderinfo["blend"] = blend[frame_count]
frame_count += 1
if im_frames:
previous = im_frames[-1]
prev_disposal = previous["encoderinfo"].get("disposal")
prev_blend = previous["encoderinfo"].get("blend")
if prev_disposal == APNG_DISPOSE_OP_PREVIOUS and len(im_frames) < 2:
prev_disposal = APNG_DISPOSE_OP_BACKGROUND
if prev_disposal == APNG_DISPOSE_OP_BACKGROUND:
base_im = previous["im"]
dispose = Image.core.fill("RGBA", im.size, (0, 0, 0, 0))
bbox = previous["bbox"]
if bbox:
dispose = dispose.crop(bbox)
else:
bbox = (0, 0) + im.size
base_im.paste(dispose, bbox)
elif prev_disposal == APNG_DISPOSE_OP_PREVIOUS:
base_im = im_frames[-2]["im"]
else:
base_im = previous["im"]
delta = ImageChops.subtract_modulo(
im_frame.convert("RGB"), base_im.convert("RGB")
)
bbox = delta.getbbox()
if (
not bbox
and prev_disposal == encoderinfo.get("disposal")
and prev_blend == encoderinfo.get("blend")
):
duration = encoderinfo.get("duration", 0)
if duration:
if "duration" in previous["encoderinfo"]:
previous["encoderinfo"]["duration"] += duration
else:
previous["encoderinfo"]["duration"] = duration
continue
else:
bbox = None
im_frames.append({"im": im_frame, "bbox": bbox, "encoderinfo": encoderinfo})
# animation control
chunk(
fp,
b"acTL",
o32(len(im_frames)), # 0: num_frames
o32(loop), # 4: num_plays
)
# default image IDAT (if it exists)
if default_image:
ImageFile._save(im, _idat(fp, chunk), [("zip", (0, 0) + im.size, 0, rawmode)])
seq_num = 0
for frame, frame_data in enumerate(im_frames):
im_frame = frame_data["im"]
if not frame_data["bbox"]:
bbox = (0, 0) + im_frame.size
else:
bbox = frame_data["bbox"]
im_frame = im_frame.crop(bbox)
size = im_frame.size
duration = int(round(frame_data["encoderinfo"].get("duration", 0)))
disposal = frame_data["encoderinfo"].get("disposal", APNG_DISPOSE_OP_NONE)
blend = frame_data["encoderinfo"].get("blend", APNG_BLEND_OP_SOURCE)
# frame control
chunk(
fp,
b"fcTL",
o32(seq_num), # sequence_number
o32(size[0]), # width
o32(size[1]), # height
o32(bbox[0]), # x_offset
o32(bbox[1]), # y_offset
o16(duration), # delay_numerator
o16(1000), # delay_denominator
o8(disposal), # dispose_op
o8(blend), # blend_op
)
seq_num += 1
# frame data
if frame == 0 and not default_image:
# first frame must be in IDAT chunks for backwards compatibility
ImageFile._save(
im_frame,
_idat(fp, chunk),
[("zip", (0, 0) + im_frame.size, 0, rawmode)],
)
else:
fdat_chunks = _fdat(fp, chunk, seq_num)
ImageFile._save(
im_frame,
fdat_chunks,
[("zip", (0, 0) + im_frame.size, 0, rawmode)],
)
seq_num = fdat_chunks.seq_num