forked from josch/img2pdf
src/img2pdf_test.py: refactor comparison code to remove code duplication
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F2CBA5C78FBD83E1
1 changed files with 43 additions and 110 deletions
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@ -284,6 +284,46 @@ def write_png(data, path, bitdepth, colortype, palette=None, iccp=None):
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f.write(struct.pack(">I", 0) + block + struct.pack(">I", zlib.crc32(block)))
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f.write(struct.pack(">I", 0) + block + struct.pack(">I", zlib.crc32(block)))
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def compare(im1, im2, exact, icc, cmyk):
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if exact:
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if cmyk:
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raise Exception("cmyk cannot be exact")
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elif icc:
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raise Exception("icc cannot be exact")
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else:
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subprocess.check_call(
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[
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"compare",
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"-metric",
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"AE",
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im1,
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im2,
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"null:",
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]
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)
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else:
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iccargs = []
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if icc:
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iccargs = ["-profile", "/usr/share/color/icc/sRGB.icc"]
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psnr = subprocess.run(
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["compare"]
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+ iccargs
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+ [
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"-metric",
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"PSNR",
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im1,
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im2,
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"null:",
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],
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check=False,
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stderr=subprocess.PIPE,
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).stderr
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assert psnr != b"0"
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psnr = float(psnr.strip(b"0"))
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assert psnr != 0 # or otherwise we would use the exact variant
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assert psnr > 50
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def compare_ghostscript(tmpdir, img, pdf, gsdevice="png16m", exact=True, icc=False):
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def compare_ghostscript(tmpdir, img, pdf, gsdevice="png16m", exact=True, icc=False):
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if gsdevice in ["png16m", "pnggray"]:
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if gsdevice in ["png16m", "pnggray"]:
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ext = "png"
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ext = "png"
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@ -303,52 +343,7 @@ def compare_ghostscript(tmpdir, img, pdf, gsdevice="png16m", exact=True, icc=Fal
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str(pdf),
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str(pdf),
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]
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]
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)
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)
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if exact:
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compare(str(img), str(tmpdir / "gs-1.") + ext, exact, icc, False)
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if icc:
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subprocess.check_call(
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[
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"compare",
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"-metric",
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"AE",
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"(",
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"-profile",
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"/usr/share/color/icc/ghostscript/srgb.icc",
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"-depth",
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"8",
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str(img),
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")",
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str(tmpdir / "gs-1.") + ext,
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"null:",
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]
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)
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else:
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subprocess.check_call(
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[
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"compare",
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"-metric",
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"AE",
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str(img),
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str(tmpdir / "gs-1.") + ext,
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"null:",
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]
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)
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else:
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psnr = subprocess.run(
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[
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"compare",
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"-metric",
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"PSNR",
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str(img),
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str(tmpdir / "gs-1.") + ext,
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"null:",
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],
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check=False,
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stderr=subprocess.PIPE,
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).stderr
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assert psnr != b"0"
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psnr = float(psnr.strip(b"0"))
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assert psnr != 0 # or otherwise we would use the exact variant
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assert psnr > 50
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(tmpdir / ("gs-1." + ext)).unlink()
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(tmpdir / ("gs-1." + ext)).unlink()
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@ -356,56 +351,7 @@ def compare_poppler(tmpdir, img, pdf, exact=True, icc=False):
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subprocess.check_call(
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subprocess.check_call(
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["pdftocairo", "-r", "96", "-png", str(pdf), str(tmpdir / "poppler")]
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["pdftocairo", "-r", "96", "-png", str(pdf), str(tmpdir / "poppler")]
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)
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)
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if exact:
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compare(str(img), str(tmpdir / "poppler-1.png"), exact, icc, False)
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if icc:
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raise Exception("not exact with icc")
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subprocess.check_call(
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[
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"compare",
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"-metric",
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"AE",
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str(img),
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str(tmpdir / "poppler-1.png"),
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"null:",
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]
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)
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else:
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if icc:
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psnr = subprocess.run(
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[
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"compare",
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"-metric",
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"PSNR",
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"(",
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"-profile",
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"/usr/share/color/icc/ghostscript/srgb.icc",
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"-depth",
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"8",
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str(img),
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")",
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str(tmpdir / "poppler-1.png"),
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"null:",
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],
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check=False,
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stderr=subprocess.PIPE,
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).stderr
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else:
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psnr = subprocess.run(
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[
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"compare",
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"-metric",
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"PSNR",
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str(img),
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str(tmpdir / "poppler-1.png"),
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"null:",
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],
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check=False,
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stderr=subprocess.PIPE,
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).stderr
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assert psnr != b"0"
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psnr = float(psnr.strip(b"0"))
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assert psnr != 0 # or otherwise we would use the exact variant
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assert psnr > 50
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(tmpdir / "poppler-1.png").unlink()
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(tmpdir / "poppler-1.png").unlink()
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@ -422,20 +368,7 @@ def compare_mupdf(tmpdir, img, pdf, exact=True, cmyk=False):
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subprocess.check_call(
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subprocess.check_call(
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["mutool", "draw", "-r", "96", "-png", "-o", str(out), str(pdf)]
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["mutool", "draw", "-r", "96", "-png", "-o", str(out), str(pdf)]
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)
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)
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if exact:
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compare(str(img), str(out), exact, False, cmyk)
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if cmyk:
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raise Exception("cmyk cannot be exact")
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subprocess.check_call(["compare", "-metric", "AE", str(img), str(out), "null:"])
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else:
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psnr = subprocess.run(
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["compare", "-metric", "PSNR", str(img), str(out), "null:"],
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check=False,
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stderr=subprocess.PIPE,
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).stderr
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assert psnr != b"0"
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psnr = float(psnr.strip(b"0"))
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assert psnr != 0 # or otherwise we would use the exact variant
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assert psnr > 50
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out.unlink()
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out.unlink()
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