initial commit

2026-09-21 13:41:40 +09:00
commit 855c7328df
411 changed files with 85352 additions and 0 deletions
@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+"""Explain the retained failing CMYK comparison without relaxing its criterion."""
+from io import BytesIO
+import hashlib
+import json
+from pathlib import Path
+
+from PIL import Image, ImageCms
+from pypdf import PdfReader
+
+ROOT = Path(__file__).resolve().parents[2]
+RESULTS = ROOT / 'tests/results/cmyk-lut'
+
+
+def sha(path):
+    with path.open('rb') as stream:
+        return hashlib.file_digest(stream, 'sha256').hexdigest()
+
+
+def main():
+    corpus=ROOT/'tests/fixtures/pdf/cmyk-lut'
+    spec=json.loads((corpus/'manifest.json').read_text())
+    pdf=PdfReader(corpus/spec['file'])
+    assert b'/RelativeColorimetric ri' in pdf.pages[0].get_contents().get_data()
+    assert pdf.pages[0]['/Resources']['/XObject']['/Sample']['/Intent']=='/RelativeColorimetric'
+    source=json.loads((RESULTS/'pdfium-source/record.json').read_text())
+    for row in source['files']:
+        assert sha(RESULTS/'pdfium-source'/row['path'])==row['sha256']
+    transform_source=(RESULTS/'pdfium-source/core/fxcodec/icc/icc_transform.cpp').read_text()
+    assert 'TYPE_BGR_8, INTENT_PERCEPTUAL, /*dwFlags=*/0' in transform_source
+    profile=ImageCms.ImageCmsProfile(BytesIO((corpus/spec['profileFile']).read_bytes()))
+    transformations={intent:ImageCms.buildTransformFromOpenProfiles(profile,ImageCms.createProfile('sRGB'),
+                     'CMYK','RGB',renderingIntent=value) for intent,value in [('perceptual',0),('relative',1)]}
+    colors={}
+    for probe in spec['probes']:
+        if probe['kind']!='icc-image': continue
+        pixel=Image.new('CMYK',(1,1),tuple(round(c*255) for c in probe['components']))
+        colors[probe['sample']]={name:list(ImageCms.applyTransform(pixel,t).getpixel((0,0))) for name,t in transformations.items()}
+    rows=[]
+    for os_name in ('arch','ubuntu'):
+        report=json.loads((RESULTS/os_name/'report.json').read_text())
+        assert not report['success'] and report['fixture']['sha256']==spec['sha256']
+        assert report['originalUnchanged'] and report['binariesUnchanged']
+        assert report['runnerSha256']==sha(ROOT/'tests/cmyk_lut/run.py')
+        for name,digest in report['evidenceSha256'].items():
+            assert sha(RESULTS/os_name/name)==digest
+        failed=0; matches=[]
+        for scale in report['scales']:
+            failed+=sum(not p['success'] for p in scale['probes'])
+            for probe in scale['probes']:
+                if probe['kind']!='icc-image': continue
+                pair=colors[probe['sample']]
+                errors={name:max(abs(a-b) for a,b in zip(probe['actualRgb'][name],pair[intent]))
+                        for name,intent in [('pdfium','perceptual'),('poppler','relative')]}
+                matches.append({'scale':scale['scale'],'sample':probe['sample'],'actualRgb':probe['actualRgb'],
+                                'cmmIntentColors':pair,'errorsAgainstRespectiveIntent':errors})
+        failed_by_renderer={name:sum(p['maxChannelError'].get(name,0)>spec['tolerance8Bit']
+                                    for scale in report['scales'] for p in scale['probes'])
+                            for name in ('pdfium','poppler')}
+        maximum=max(p['maxChannelError'].get('pdfium',0) for scale in report['scales'] for p in scale['probes'])
+        assert failed==failed_by_renderer['pdfium']==30 and failed_by_renderer['poppler']==0 and maximum==74
+        assert all(max(m['errorsAgainstRespectiveIntent'].values())<=1 for m in matches)
+        rows.append({'os':os_name,'comparisonReportSha256':sha(RESULTS/os_name/'report.json'),
+                     'analyticProbes':48,'failedPdfiumAnalyticProbes':failed,'failedPopplerAnalyticProbes':failed_by_renderer['poppler'],
+                     'maximumPdfiumAnalyticChannelDifference':maximum,'intentMatchedImageProbes':matches})
+    result={'diagnosisVerified':True,'renderingAcceptance':False,'relativeIntentPreserved':False,
+            'toleranceUnchanged':spec['tolerance8Bit'],'profileSha256':spec['profileSha256'],
+            'sourceRevision':source['revision'],'sourceEvidenceSha256':sha(RESULTS/'pdfium-source/record.json'),
+            'diagnoserSha256':sha(Path(__file__)),'cmmVersion':ImageCms.core.littlecms_version,'results':rows,
+            'finding':'At this fixed PDFium revision, ICC conversion selects INTENT_PERCEPTUAL regardless of the '
+                      'relative-colorimetric intent in the test PDF. On both OSs, all eight image swatches at all '
+                      'three scales match LittleCMS perceptual output within one channel level. Poppler matches '
+                      'relative-colorimetric output. This explains, but does not accept or repair, the difference.',
+            'remaining':'G-RENDER requires review and resolution/explicit compatibility judgment. No renderer '
+                        'patch, engine substitution or user-visible detection was implemented in this comparison.'}
+    (RESULTS/'diagnosis.json').write_text(json.dumps(result,indent=2)+'\n')
+    print(json.dumps({'diagnosisVerified':True,'renderingAcceptance':False,'failedAnalyticProbes':60,
+                      'intentMatchedImageProbes':48}))
+
+
+if __name__=='__main__': main()