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private.py
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private.py
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"""
Undocumented private functions for other code to look better.
"""
from math import ceil
from typing import Union
from _pillow_heif_cffi import ffi, lib
from PIL import __version__ as pil_version
from ._libheif_ctx import LibHeifCtxWrite
from .constants import HeifChroma, HeifColorProfileType, HeifColorspace
from .error import check_libheif_error
FFI_DRY_ALLOC = ffi.new_allocator(should_clear_after_alloc=False)
# from dataclasses import dataclass
# @dataclass # Available from Python 3.7
class HeifCtxAsDict: # noqa # pylint: disable=too-few-public-methods
"""Representation of one image"""
def __init__(self, mode: str, size: tuple, data, **kwargs):
stride = kwargs.get("stride", None)
if stride is None:
stride = get_pure_stride(mode, size[0])
self.mode = mode
self.size = size
self.data = data
self.stride = stride
self.additional_info = kwargs.get("add_info", {})
def get_pure_stride(mode: str, width: int):
return width * MODE_INFO[mode][0] * ceil(MODE_INFO[mode][1] / 8)
MODE_CONVERT = {
# source_mode: {target_mode: convert_function,}
"BGRA;16": {"RGBA;10": lib.convert_bgra16_to_rgba10, "RGBA;12": lib.convert_bgra16_to_rgba12},
"BGRa;16": {"RGBa;10": lib.convert_bgra16_to_rgba10, "RGBa;12": lib.convert_bgra16_to_rgba12},
"BGR;16": {"RGB;10": lib.convert_bgr16_to_rgb10, "RGB;12": lib.convert_bgr16_to_rgb12},
"RGBA;16": {
"RGBA;10": lib.convert_rgba16_to_rgba10,
"RGBA;12": lib.convert_rgba16_to_rgba12,
"RGBA": lib.convert_rgba16_to_rgba,
},
"RGBa;16": {
"RGBa;10": lib.convert_rgba16_to_rgba10,
"RGBa;12": lib.convert_rgba16_to_rgba12,
},
"RGB;16": {"RGB;10": lib.convert_rgb16_to_rgb10, "RGB;12": lib.convert_rgb16_to_rgb12},
"L;16": {"L;10": lib.convert_i16_to_i10, "L;12": lib.convert_i16_to_i12},
"I;16": {"L;10": lib.convert_i16_to_i10, "L;12": lib.convert_i16_to_i12},
"I;16L": {"L;10": lib.convert_i16_to_i10, "L;12": lib.convert_i16_to_i12},
"RGBA;12": {"RGBA;16": lib.convert_rgba12_to_rgba16, "BGRA;16": lib.convert_rgba12_to_bgra16},
"RGBa;12": {"RGBa;16": lib.convert_rgba12_to_rgba16, "BGRa;16": lib.convert_rgba12_to_bgra16},
"RGB;12": {"RGB;16": lib.convert_rgb12_to_rgb16, "BGR;16": lib.convert_rgb12_to_bgr16},
"RGBA;10": {"RGBA;16": lib.convert_rgba10_to_rgba16, "BGRA;16": lib.convert_rgba10_to_bgra16},
"RGBa;10": {"RGBa;16": lib.convert_rgba10_to_rgba16, "BGRa;16": lib.convert_rgba10_to_bgra16},
"RGB;10": {"RGB;16": lib.convert_rgb10_to_rgb16, "BGR;16": lib.convert_rgb10_to_bgr16},
"BGRA": {"RGBA": lib.convert_bgra_rgba},
"BGRa": {"RGBa": lib.convert_bgra_rgba},
"BGR": {"RGB": lib.convert_bgr_rgb},
"RGBA": {
"BGRA": lib.convert_bgra_rgba,
"RGBA;16": lib.convert_rgba_to_rgba16,
"BGRA;16": lib.convert_rgba_to_bgra16,
},
"RGBa": {
"BGRa": lib.convert_bgra_rgba,
"RGBa;16": lib.convert_rgba_to_rgba16,
"BGRa;16": lib.convert_rgba_to_bgra16,
"RGB": lib.convert_rgba_premultiplied_to_rgb,
"BGR": lib.convert_rgba_premultiplied_to_bgr,
},
"RGB": {"BGR": lib.convert_bgr_rgb, "RGB;16": lib.convert_rgb_to_rgb16, "BGR;16": lib.convert_rgb_to_bgr16},
}
MODE_INFO = {
# name -> [channels, bits per pixel channel, colorspace, chroma, (mode_for_saving 10,12 bit), numpy_typestr]
"BGRA;16": (4, 16, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_LE, ("RGBA;10", "RGBA;12"), "<u2"),
"BGRa;16": (4, 16, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_LE, ("RGBa;10", "RGBa;12"), "<u2"),
"BGR;16": (3, 16, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBB_LE, ("RGB;10", "RGB;12"), "<u2"),
"RGBA;16": (4, 16, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_LE, ("RGBA;10", "RGBA;12"), "<u2"),
"RGBa;16": (4, 16, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_LE, ("RGBa;10", "RGBa;12"), "<u2"),
"RGB;16": (3, 16, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBB_LE, ("RGB;10", "RGB;12"), "<u2"),
"L;16": (1, 16, HeifColorspace.MONOCHROME, HeifChroma.MONOCHROME, ("L;10", "L;12"), "<u2"),
"I;16": (1, 16, HeifColorspace.MONOCHROME, HeifChroma.MONOCHROME, ("L;10", "L;12"), "<u2"),
"I;16L": (1, 16, HeifColorspace.MONOCHROME, HeifChroma.MONOCHROME, ("L;10", "L;12"), "<u2"),
"RGBA;12": (4, 12, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_LE, None, "<u2"),
"RGBa;12": (4, 12, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_LE, None, "<u2"),
"RGB;12": (3, 12, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBB_LE, None, "<u2"),
"RGBA;12B": (4, 12, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_BE, None, ">u2"),
"RGBa;12B": (4, 12, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_BE, None, ">u2"),
"RGB;12B": (3, 12, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBB_BE, None, ">u2"),
"L;12": (1, 12, HeifColorspace.MONOCHROME, HeifChroma.MONOCHROME, None, "<u2"),
"RGBA;10": (4, 10, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_LE, None, "<u2"),
"RGBa;10": (4, 10, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_LE, None, "<u2"),
"RGB;10": (3, 10, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBB_LE, None, "<u2"),
"RGBA;10B": (4, 10, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_BE, None, ">u2"),
"RGBa;10B": (4, 10, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBBAA_BE, None, ">u2"),
"RGB;10B": (3, 10, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RRGGBB_BE, None, ">u2"),
"L;10": (1, 10, HeifColorspace.MONOCHROME, HeifChroma.MONOCHROME, None, "<u2"),
"RGBA": (4, 8, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RGBA, None, "|u1"),
"RGBa": (4, 8, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RGBA, None, "|u1"),
"RGB": (3, 8, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RGB, None, "|u1"),
"BGRA": (4, 8, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RGBA, "RGBA", "|u1"),
"BGRa": (4, 8, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RGBA, "RGBa", "|u1"),
"BGR": (3, 8, HeifColorspace.RGB, HeifChroma.INTERLEAVED_RGB, "RGB", "|u1"),
"L": (1, 8, HeifColorspace.MONOCHROME, HeifChroma.MONOCHROME, None, "|u1"),
"": (0, 0, HeifColorspace.UNDEFINED, HeifChroma.UNDEFINED, None, ""),
}
def read_color_profile(handle) -> dict:
profile_type = lib.heif_image_handle_get_color_profile_type(handle)
if profile_type == HeifColorProfileType.NOT_PRESENT:
return {}
if profile_type == HeifColorProfileType.NCLX:
_type = "nclx"
pp_data = ffi.new("struct heif_color_profile_nclx **")
data_length = ffi.sizeof("struct heif_color_profile_nclx")
error = lib.heif_image_handle_get_nclx_color_profile(handle, pp_data)
p_data = pp_data[0]
ffi.release(pp_data)
else:
_type = "prof" if profile_type == HeifColorProfileType.PROF else "rICC"
data_length = lib.heif_image_handle_get_raw_color_profile_size(handle)
if data_length == 0:
return {"type": _type, "data": b""}
p_data = ffi.new("char[]", data_length)
error = lib.heif_image_handle_get_raw_color_profile(handle, p_data)
check_libheif_error(error)
data_buffer = ffi.buffer(p_data, data_length)
return {"type": _type, "data": bytes(data_buffer)}
def set_color_profile(heif_img, info: dict) -> None:
__icc_profile = info.get("icc_profile", None)
if __icc_profile is not None:
_prof_type = info.get("icc_profile_type", "prof").encode("ascii")
error = lib.heif_image_set_raw_color_profile(
heif_img, _prof_type, info["icc_profile"], len(info["icc_profile"])
)
check_libheif_error(error)
elif info.get("nclx_profile", None):
error = lib.heif_image_set_nclx_color_profile(
heif_img,
ffi.cast("const struct heif_color_profile_nclx*", ffi.from_buffer(info["nclx_profile"])),
)
check_libheif_error(error)
def retrieve_exif(metadata: list):
_result = None
_purge = []
for i, md_block in enumerate(metadata):
if md_block["type"] == "Exif":
_purge.append(i)
if not _result and md_block["data"]:
_result = md_block["data"]
for i in reversed(_purge):
del metadata[i]
return _result
def set_exif(ctx: LibHeifCtxWrite, heif_img_handle, exif: Union[bytes, None]) -> None:
if exif is not None:
error = lib.heif_context_add_exif_metadata(ctx.ctx, heif_img_handle, exif, len(exif))
check_libheif_error(error)
def retrieve_xmp(metadata: list):
_result = None
_purge = []
for i, md_block in enumerate(metadata):
if md_block["type"] == "mime":
_purge.append(i)
if not _result:
_result = md_block["data"]
for i in reversed(_purge):
del metadata[i]
return _result
def set_xmp(ctx: LibHeifCtxWrite, heif_img_handle, xmp: Union[bytes, None]) -> None:
if xmp is not None:
error = lib.heif_context_add_XMP_metadata(ctx.ctx, heif_img_handle, xmp, len(xmp))
check_libheif_error(error)
def read_metadata(handle) -> list:
block_count = lib.heif_image_handle_get_number_of_metadata_blocks(handle, ffi.NULL)
if block_count == 0:
return []
metadata = []
blocks_ids = ffi.new("heif_item_id[]", block_count)
lib.heif_image_handle_get_list_of_metadata_block_IDs(handle, ffi.NULL, blocks_ids, block_count)
for block_id in blocks_ids:
metadata_type = lib.heif_image_handle_get_metadata_type(handle, block_id)
metadata_type = ffi.string(metadata_type).decode("utf-8")
content_type = ffi.string(lib.heif_image_handle_get_metadata_content_type(handle, block_id))
data_length = lib.heif_image_handle_get_metadata_size(handle, block_id)
if data_length > 0:
p_data = ffi.new("char[]", data_length)
error = lib.heif_image_handle_get_metadata(handle, block_id, p_data)
check_libheif_error(error)
data_buffer = ffi.buffer(p_data, data_length)
data = bytes(data_buffer)
if metadata_type == "Exif":
data = data[4:] # skip TIFF header, first 4 bytes
metadata.append({"type": metadata_type, "data": data, "content_type": content_type})
return metadata
def set_metadata(ctx: LibHeifCtxWrite, heif_img_handle, info: dict) -> None:
for metadata in info["metadata"]:
error = lib.heif_context_add_generic_metadata(
ctx.ctx,
heif_img_handle,
metadata["data"],
len(metadata["data"]),
metadata["type"].encode("utf-8"),
metadata["content_type"],
)
check_libheif_error(error)
def exif_from_pillow(additional_info: dict, frame) -> None:
if "exif" not in additional_info:
if hasattr(frame, "getexif"):
if pil_version[:2] not in ("6.", "7.", "8.") and pil_version[:4] not in ("9.0.", "9.1."):
exif = frame.getexif()
if exif:
additional_info["exif"] = exif.tobytes()
def xmp_from_pillow(additional_info: dict, frame) -> None:
if "xmp" not in additional_info:
if "XML:com.adobe.xmp" in frame.info: # PNG
additional_info["xmp"] = frame.info["XML:com.adobe.xmp"]
elif hasattr(frame, "tag_v2"): # TIFF
if 700 in frame.tag_v2:
additional_info["xmp"] = frame.tag_v2[700]
elif hasattr(frame, "applist"): # JPEG
for segment, content in frame.applist:
if segment == "APP1":
marker, xmp_tags = content.rsplit(b"\x00", 1)
if marker == b"http://ns.adobe.com/xap/1.0/":
additional_info["xmp"] = xmp_tags
break
if "xmp" in additional_info and isinstance(additional_info["xmp"], str):
additional_info["xmp"] = additional_info["xmp"].encode("utf-8")