asmhatreandClaude Sonnet 5.5
3a30194459
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b6Kg9RWSTJzyz6KP9X
68 lines
2.8 KiB
Python
Executable File
68 lines
2.8 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Crop the item table out of each probe PDF and stack the crops under a Pillow/libraqm reference line.
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Usage: compare.py <pdf-dir> <png-dir> <font.ttf>
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The reference is the same probe text drawn by Pillow's RAQM layout engine (libraqm -> HarfBuzz) with the same
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Noto Sans Devanagari file: an independent shaper, there to show what "correct" looks like.
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"""
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import re, subprocess, sys
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from pathlib import Path
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from PIL import Image, ImageDraw, ImageFont
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pdfdir, pngdir, fontfile = Path(sys.argv[1]), Path(sys.argv[2]), sys.argv[3]
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PROBE = "क्षत्रिय ज्ञान श्री द्वार कर्म कि प्रिय"
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DPI = 200
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ENGINES = [
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("openpdf", "OpenPDF 3.0.5, defaults"),
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("itext", "iText Core 9.8.0, defaults"),
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("flyingsaucer", "Flying Saucer 10.7.0, defaults"),
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("openpdf-fop", "OpenPDF + Apache FOP 2.11 on the classpath"),
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("openpdf-jdk-actualtext", "OpenPDF GlyphLayoutManager (JDK shaper)"),
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("flyingsaucer-shaped", "Flying Saucer + OpenPDF LayoutProcessor"),
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]
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def box(pdf, word):
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out = subprocess.run(["pdftotext", "-bbox", str(pdf), "-"], capture_output=True, text=True).stdout
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hits = re.findall(r'<word xMin="([\d.]+)" yMin="([\d.]+)" xMax="([\d.]+)" yMax="([\d.]+)">%s[^<]*</word>' % re.escape(word), out)
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return [tuple(map(float, h)) for h in hits]
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font_big = ImageFont.truetype(fontfile, 40, layout_engine=ImageFont.Layout.RAQM)
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font_lbl = ImageFont.truetype(fontfile, 22, layout_engine=ImageFont.Layout.RAQM)
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rows = []
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ref = Image.new("RGB", (1500, 120), "white")
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d = ImageDraw.Draw(ref)
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d.text((10, 6), "reference: Pillow + libraqm (HarfBuzz), same font", font=font_lbl, fill="#555")
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d.text((10, 44), PROBE, font=font_big, fill="black")
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rows.append(ref)
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for engine, label in ENGINES:
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pdf = pdfdir / f"probe-{engine}.pdf"
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if not pdf.exists():
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print("skip", engine, "(no probe pdf)")
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continue
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item = box(pdf, "Item")[0]
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total = box(pdf, "Total")[-1]
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y0 = int((item[1] - 8) * DPI / 72)
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y1 = int((total[3] + 62) * DPI / 72)
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subprocess.run(["pdftoppm", "-r", str(DPI), "-png", "-singlefile", "-x", str(int(36 * DPI / 72)), "-y", str(y0),
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"-W", "1500", "-H", str(y1 - y0), str(pdf), str(pngdir / f"crop-{engine}")], check=True)
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img = Image.open(pngdir / f"crop-{engine}.png").convert("RGB")
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band = Image.new("RGB", (1500, 34), "#f4f5f7")
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ImageDraw.Draw(band).text((10, 4), label, font=font_lbl, fill="#222")
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rows.append(band)
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rows.append(img)
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(pngdir / f"crop-{engine}.png").unlink()
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W = 1500
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H = sum(r.height for r in rows)
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out = Image.new("RGB", (W, H), "white")
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y = 0
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for r in rows:
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out.paste(r, (0, y))
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y += r.height
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out = out.convert("P", palette=Image.ADAPTIVE, colors=32)
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out.save(pngdir / "shaping-comparison.png", optimize=True)
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print("wrote", pngdir / "shaping-comparison.png", out.size)
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