mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-25 17:36:18 +03:00
Moved writing of object into separate function
This commit is contained in:
Andrew Murray
parent
a5b0256290
commit
c9147c9c85
|
|
@ -46,6 +46,128 @@ def _save_all(im, fp, filename):
|
|||
# (Internal) Image save plugin for the PDF format.
|
||||
|
||||
|
||||
def _write_image(im, filename, existing_pdf, image_refs):
|
||||
# FIXME: Should replace ASCIIHexDecode with RunLengthDecode
|
||||
# (packbits) or LZWDecode (tiff/lzw compression). Note that
|
||||
# PDF 1.2 also supports Flatedecode (zip compression).
|
||||
|
||||
params = None
|
||||
decode = None
|
||||
|
||||
#
|
||||
# Get image characteristics
|
||||
|
||||
width, height = im.size
|
||||
|
||||
dict_obj = {"BitsPerComponent": 8}
|
||||
if im.mode == "1":
|
||||
if features.check("libtiff"):
|
||||
filter = "CCITTFaxDecode"
|
||||
dict_obj["BitsPerComponent"] = 1
|
||||
params = PdfParser.PdfArray(
|
||||
[
|
||||
PdfParser.PdfDict(
|
||||
{
|
||||
"K": -1,
|
||||
"BlackIs1": True,
|
||||
"Columns": width,
|
||||
"Rows": height,
|
||||
}
|
||||
)
|
||||
]
|
||||
)
|
||||
else:
|
||||
filter = "DCTDecode"
|
||||
dict_obj["ColorSpace"] = PdfParser.PdfName("DeviceGray")
|
||||
procset = "ImageB" # grayscale
|
||||
elif im.mode == "L":
|
||||
filter = "DCTDecode"
|
||||
# params = f"<< /Predictor 15 /Columns {width-2} >>"
|
||||
dict_obj["ColorSpace"] = PdfParser.PdfName("DeviceGray")
|
||||
procset = "ImageB" # grayscale
|
||||
elif im.mode == "LA":
|
||||
filter = "JPXDecode"
|
||||
# params = f"<< /Predictor 15 /Columns {width-2} >>"
|
||||
procset = "ImageB" # grayscale
|
||||
dict_obj["SMaskInData"] = 1
|
||||
elif im.mode == "P":
|
||||
filter = "ASCIIHexDecode"
|
||||
palette = im.getpalette()
|
||||
dict_obj["ColorSpace"] = [
|
||||
PdfParser.PdfName("Indexed"),
|
||||
PdfParser.PdfName("DeviceRGB"),
|
||||
255,
|
||||
PdfParser.PdfBinary(palette),
|
||||
]
|
||||
procset = "ImageI" # indexed color
|
||||
elif im.mode == "RGB":
|
||||
filter = "DCTDecode"
|
||||
dict_obj["ColorSpace"] = PdfParser.PdfName("DeviceRGB")
|
||||
procset = "ImageC" # color images
|
||||
elif im.mode == "RGBA":
|
||||
filter = "JPXDecode"
|
||||
procset = "ImageC" # color images
|
||||
dict_obj["SMaskInData"] = 1
|
||||
elif im.mode == "CMYK":
|
||||
filter = "DCTDecode"
|
||||
dict_obj["ColorSpace"] = PdfParser.PdfName("DeviceCMYK")
|
||||
procset = "ImageC" # color images
|
||||
decode = [1, 0, 1, 0, 1, 0, 1, 0]
|
||||
else:
|
||||
msg = f"cannot save mode {im.mode}"
|
||||
raise ValueError(msg)
|
||||
|
||||
#
|
||||
# image
|
||||
|
||||
op = io.BytesIO()
|
||||
|
||||
if filter == "ASCIIHexDecode":
|
||||
ImageFile._save(im, op, [("hex", (0, 0) + im.size, 0, im.mode)])
|
||||
elif filter == "CCITTFaxDecode":
|
||||
im.save(
|
||||
op,
|
||||
"TIFF",
|
||||
compression="group4",
|
||||
# use a single strip
|
||||
strip_size=math.ceil(im.width / 8) * im.height,
|
||||
)
|
||||
elif filter == "DCTDecode":
|
||||
Image.SAVE["JPEG"](im, op, filename)
|
||||
elif filter == "JPXDecode":
|
||||
del dict_obj["BitsPerComponent"]
|
||||
Image.SAVE["JPEG2000"](im, op, filename)
|
||||
elif filter == "FlateDecode":
|
||||
ImageFile._save(im, op, [("zip", (0, 0) + im.size, 0, im.mode)])
|
||||
elif filter == "RunLengthDecode":
|
||||
ImageFile._save(im, op, [("packbits", (0, 0) + im.size, 0, im.mode)])
|
||||
else:
|
||||
msg = f"unsupported PDF filter ({filter})"
|
||||
raise ValueError(msg)
|
||||
|
||||
stream = op.getvalue()
|
||||
if filter == "CCITTFaxDecode":
|
||||
stream = stream[8:]
|
||||
filter = PdfParser.PdfArray([PdfParser.PdfName(filter)])
|
||||
else:
|
||||
filter = PdfParser.PdfName(filter)
|
||||
|
||||
existing_pdf.write_obj(
|
||||
image_refs[page_number],
|
||||
stream=stream,
|
||||
Type=PdfParser.PdfName("XObject"),
|
||||
Subtype=PdfParser.PdfName("Image"),
|
||||
Width=width, # * 72.0 / x_resolution,
|
||||
Height=height, # * 72.0 / y_resolution,
|
||||
Filter=filter,
|
||||
Decode=decode,
|
||||
DecodeParms=params,
|
||||
**dict_obj,
|
||||
)
|
||||
|
||||
return procset
|
||||
|
||||
|
||||
def _save(im, fp, filename, save_all=False):
|
||||
is_appending = im.encoderinfo.get("append", False)
|
||||
if is_appending:
|
||||
|
|
@ -121,123 +243,7 @@ def _save(im, fp, filename, save_all=False):
|
|||
for im_sequence in ims:
|
||||
im_pages = ImageSequence.Iterator(im_sequence) if save_all else [im_sequence]
|
||||
for im in im_pages:
|
||||
# FIXME: Should replace ASCIIHexDecode with RunLengthDecode
|
||||
# (packbits) or LZWDecode (tiff/lzw compression). Note that
|
||||
# PDF 1.2 also supports Flatedecode (zip compression).
|
||||
|
||||
params = None
|
||||
decode = None
|
||||
|
||||
#
|
||||
# Get image characteristics
|
||||
|
||||
width, height = im.size
|
||||
|
||||
dict_obj = {"BitsPerComponent": 8}
|
||||
if im.mode == "1":
|
||||
if features.check("libtiff"):
|
||||
filter = "CCITTFaxDecode"
|
||||
dict_obj["BitsPerComponent"] = 1
|
||||
params = PdfParser.PdfArray(
|
||||
[
|
||||
PdfParser.PdfDict(
|
||||
{
|
||||
"K": -1,
|
||||
"BlackIs1": True,
|
||||
"Columns": width,
|
||||
"Rows": height,
|
||||
}
|
||||
)
|
||||
]
|
||||
)
|
||||
else:
|
||||
filter = "DCTDecode"
|
||||
dict_obj["ColorSpace"] = PdfParser.PdfName("DeviceGray")
|
||||
procset = "ImageB" # grayscale
|
||||
elif im.mode == "L":
|
||||
filter = "DCTDecode"
|
||||
# params = f"<< /Predictor 15 /Columns {width-2} >>"
|
||||
dict_obj["ColorSpace"] = PdfParser.PdfName("DeviceGray")
|
||||
procset = "ImageB" # grayscale
|
||||
elif im.mode == "LA":
|
||||
filter = "JPXDecode"
|
||||
# params = f"<< /Predictor 15 /Columns {width-2} >>"
|
||||
procset = "ImageB" # grayscale
|
||||
dict_obj["SMaskInData"] = 1
|
||||
elif im.mode == "P":
|
||||
filter = "ASCIIHexDecode"
|
||||
palette = im.getpalette()
|
||||
dict_obj["ColorSpace"] = [
|
||||
PdfParser.PdfName("Indexed"),
|
||||
PdfParser.PdfName("DeviceRGB"),
|
||||
255,
|
||||
PdfParser.PdfBinary(palette),
|
||||
]
|
||||
procset = "ImageI" # indexed color
|
||||
elif im.mode == "RGB":
|
||||
filter = "DCTDecode"
|
||||
dict_obj["ColorSpace"] = PdfParser.PdfName("DeviceRGB")
|
||||
procset = "ImageC" # color images
|
||||
elif im.mode == "RGBA":
|
||||
filter = "JPXDecode"
|
||||
procset = "ImageC" # color images
|
||||
dict_obj["SMaskInData"] = 1
|
||||
elif im.mode == "CMYK":
|
||||
filter = "DCTDecode"
|
||||
dict_obj["ColorSpace"] = PdfParser.PdfName("DeviceCMYK")
|
||||
procset = "ImageC" # color images
|
||||
decode = [1, 0, 1, 0, 1, 0, 1, 0]
|
||||
else:
|
||||
msg = f"cannot save mode {im.mode}"
|
||||
raise ValueError(msg)
|
||||
|
||||
#
|
||||
# image
|
||||
|
||||
op = io.BytesIO()
|
||||
|
||||
if filter == "ASCIIHexDecode":
|
||||
ImageFile._save(im, op, [("hex", (0, 0) + im.size, 0, im.mode)])
|
||||
elif filter == "CCITTFaxDecode":
|
||||
im.save(
|
||||
op,
|
||||
"TIFF",
|
||||
compression="group4",
|
||||
# use a single strip
|
||||
strip_size=math.ceil(im.width / 8) * im.height,
|
||||
)
|
||||
elif filter == "DCTDecode":
|
||||
Image.SAVE["JPEG"](im, op, filename)
|
||||
elif filter == "JPXDecode":
|
||||
del dict_obj["BitsPerComponent"]
|
||||
Image.SAVE["JPEG2000"](im, op, filename)
|
||||
elif filter == "FlateDecode":
|
||||
ImageFile._save(im, op, [("zip", (0, 0) + im.size, 0, im.mode)])
|
||||
elif filter == "RunLengthDecode":
|
||||
ImageFile._save(im, op, [("packbits", (0, 0) + im.size, 0, im.mode)])
|
||||
else:
|
||||
msg = f"unsupported PDF filter ({filter})"
|
||||
raise ValueError(msg)
|
||||
|
||||
stream = op.getvalue()
|
||||
if filter == "CCITTFaxDecode":
|
||||
stream = stream[8:]
|
||||
filter = PdfParser.PdfArray([PdfParser.PdfName(filter)])
|
||||
else:
|
||||
filter = PdfParser.PdfName(filter)
|
||||
|
||||
existing_pdf.write_obj(
|
||||
image_refs[page_number],
|
||||
stream=stream,
|
||||
Type=PdfParser.PdfName("XObject"),
|
||||
Subtype=PdfParser.PdfName("Image"),
|
||||
Width=width, # * 72.0 / x_resolution,
|
||||
Height=height, # * 72.0 / y_resolution,
|
||||
Filter=filter,
|
||||
Decode=decode,
|
||||
DecodeParms=params,
|
||||
**dict_obj,
|
||||
)
|
||||
procset = _write_image(im, filename, existing_pdfs, image_refs)
|
||||
|
||||
#
|
||||
# page
|
||||
|
|
@ -251,8 +257,8 @@ def _save(im, fp, filename, save_all=False):
|
|||
MediaBox=[
|
||||
0,
|
||||
0,
|
||||
width * 72.0 / x_resolution,
|
||||
height * 72.0 / y_resolution,
|
||||
im.width * 72.0 / x_resolution,
|
||||
im.height * 72.0 / y_resolution,
|
||||
],
|
||||
Contents=contents_refs[page_number],
|
||||
)
|
||||
|
|
@ -261,8 +267,8 @@ def _save(im, fp, filename, save_all=False):
|
|||
# page contents
|
||||
|
||||
page_contents = b"q %f 0 0 %f 0 0 cm /image Do Q\n" % (
|
||||
width * 72.0 / x_resolution,
|
||||
height * 72.0 / y_resolution,
|
||||
im.width * 72.0 / x_resolution,
|
||||
im.height * 72.0 / y_resolution,
|
||||
)
|
||||
|
||||
existing_pdf.write_obj(contents_refs[page_number], stream=page_contents)
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user