avoid match/case for now until python 3.10 is available on more platforms
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Johannes Schauer Marin Rodrigues
parent
bad6fcae39
commit
b804f6fe80
1 changed files with 59 additions and 34 deletions
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@ -1536,7 +1536,6 @@ def parse_png(rawdata):
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return pngidat, palette
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miff_re = re.compile(
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r"""
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[^\x00-\x20\x7f-\x9f] # the field name must not start with a control char or space
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@ -1550,6 +1549,9 @@ miff_re = re.compile(
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)
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# https://imagemagick.org/script/miff.php
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# turn off black formatting until python 3.10 is available on more platforms
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# and we can use match/case
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# fmt: off
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def parse_miff(data):
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results = []
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header, rest = data.split(b":\x1a", 1)
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@ -1563,63 +1565,85 @@ def parse_miff(data):
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if i == 0:
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assert k.lower() == "id"
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assert v.lower() == "imagemagick"
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match k.lower():
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case "class":
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match v:
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case "DirectClass" | "PseudoClass":
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#match k.lower():
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# case "class":
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if k.lower() == "class":
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#match v:
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# case "DirectClass" | "PseudoClass":
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if v in ["DirectClass", "PseudoClass"]:
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hdata["class"] = v
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case _:
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# case _:
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else:
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print("cannot understand class", v)
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case "colorspace":
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# case "colorspace":
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elif k.lower() == "colorspace":
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# theoretically RGBA and CMYKA should be supported as well
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# please teach me how to create such a MIFF file
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match v:
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case "sRGB" | "CMYK" | "Gray":
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#match v:
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# case "sRGB" | "CMYK" | "Gray":
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if v in ["sRGB", "CMYK", "Gray"]:
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hdata["colorspace"] = v
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case _:
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# case _:
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else:
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print("cannot understand colorspace", v)
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case "depth":
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match v:
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case "8" | "16" | "32":
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# case "depth":
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elif k.lower() == "depth":
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#match v:
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# case "8" | "16" | "32":
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if v in ["8", "16", "32"]:
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hdata["depth"] = int(v)
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case _:
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# case _:
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else:
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print("cannot understand depth", v)
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case "colors":
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# case "colors":
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elif k.lower() == "colors":
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hdata["colors"] = int(v)
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case "matte":
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match v:
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case "True":
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# case "matte":
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elif k.lower() == "matte":
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#match v:
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# case "True":
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if v == "True":
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hdata["matte"] = True
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case "False":
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# case "False":
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elif v == "False":
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hdata["matte"] = False
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case _:
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# case _:
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else:
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print("cannot understand matte", v)
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case "columns" | "rows":
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# case "columns" | "rows":
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elif k.lower() in ["columns", "rows"]:
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hdata[k.lower()] = int(v)
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case "compression":
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# case "compression":
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elif k.lower() == "compression":
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print("compression not yet supported")
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case "profile":
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# case "profile":
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elif k.lower() == "profile":
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assert v in ["icc", "exif"]
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hdata["profile"] = v
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case "resolution":
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# case "resolution":
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elif k.lower() == "resolution":
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dpix, dpiy = v.split("x", 1)
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hdata["resolution"] = (float(dpix), float(dpiy))
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assert "depth" in hdata
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assert "columns" in hdata
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assert "rows" in hdata
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match hdata["class"]:
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case "DirectClass":
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#match hdata["class"]:
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# case "DirectClass":
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if hdata["class"] == "DirectClass":
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if "colors" in hdata:
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assert hdata["colors"] == 0
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match hdata["colorspace"]:
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case "sRGB":
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#match hdata["colorspace"]:
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# case "sRGB":
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if hdata["colorspace"] == "sRGB":
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numchannels = 3
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colorspace = Colorspace.RGB
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case "CMYK":
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# case "CMYK":
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elif hdata["colorspace"] == "CMYK":
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numchannels = 4
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colorspace = Colorspace.CMYK
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case "Gray":
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# case "Gray":
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elif hdata["colorspace"] == "Gray":
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numchannels = 1
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colorspace = Colorspace.L
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if hdata["matte"]:
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@ -1660,7 +1684,8 @@ def parse_miff(data):
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# another image is here
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assert rest[lenimgdata:][:14].lower() == b"id=imagemagick"
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results.extend(parse_miff(rest[lenimgdata:]))
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case "PseudoClass":
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# case "PseudoClass":
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elif hdata["class"] == "PseudoClass":
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assert "colors" in hdata
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if hdata["matte"]:
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numchannels = 2
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@ -1694,6 +1719,7 @@ def parse_miff(data):
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)
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results.extend(parse_miff(rest[lenpal + lenimgdata :]))
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return results
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# fmt: on
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def read_images(rawdata, colorspace, first_frame_only=False, rot=None):
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@ -1879,7 +1905,6 @@ def read_images(rawdata, colorspace, first_frame_only=False, rot=None):
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)
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]
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if imgformat == ImageFormat.MIFF:
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return parse_miff(rawdata)
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@ -2517,8 +2542,8 @@ def convert(*images, **kwargs):
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rawdata = f.read()
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f.close()
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#md5 = hashlib.md5(rawdata).hexdigest()
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#with open("./testdata/" + md5, "wb") as f:
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# md5 = hashlib.md5(rawdata).hexdigest()
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# with open("./testdata/" + md5, "wb") as f:
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# f.write(rawdata)
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for (
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