Drop support for Ghostscript <9.50

tests/plugins/gs_feature_elision.py

@@ -9,13 +9,13 @@ from ocrmypdf import hookimpl
 from ocrmypdf.builtin_plugins import ghostscript
 from ocrmypdf.subprocess import run_polling_stderr
 
-elision_warning = """GPL Ghostscript 9.20: Setting Overprint Mode to 1
+ELISION_WARNING = """GPL Ghostscript 9.50: Setting Overprint Mode to 1
 not permitted in PDF/A-2, overprint mode not set"""
 
 
 def run_append_stderr(*args, **kwargs):
     proc = run_polling_stderr(*args, **kwargs)
-    proc.stderr += '\n' + elision_warning + '\n'
+    proc.stderr += '\n' + ELISION_WARNING + '\n'
     return proc
 
 

tests/test_main.py

@@ -716,11 +716,9 @@ def test_compression_changed(ocrmypdf_exec, resources, image, compression, outpd
     if compression == "jpeg":
         assert pdfimage.enc == Encoding.jpeg
     else:
-        if ghostscript.jpeg_passthrough_available():
-            # Ghostscript 9.23 adds JPEG passthrough, which allows a JPEG to be
-            # copied without transcoding - so report
-            if image.endswith('jpg'):
-                assert pdfimage.enc == Encoding.jpeg
+        if image.endswith('jpg'):
+            # Ghostscript JPEG passthrough - no issue
+            assert pdfimage.enc == Encoding.jpeg
         else:
             assert pdfimage.enc not in (Encoding.jpeg, Encoding.jpeg2000)
 

tests/test_validation.py

@@ -48,22 +48,6 @@ def test_hocr_notlatin_warning(caplog):
     assert 'PDF renderer is known to cause' in caplog.text
 
 
-def test_old_ghostscript(caplog):
-    with patch('ocrmypdf._exec.ghostscript.version', return_value='9.19'), patch(
-        'ocrmypdf._exec.tesseract.get_languages', return_value={'eng', 'chi_sim'}
-    ):
-        vd.check_options(*make_opts_pm(language='chi_sim', output_type='pdfa'))
-        assert 'does not work correctly' in caplog.text
-
-    with patch('ocrmypdf._exec.ghostscript.version', return_value='9.18'):
-        with pytest.raises(MissingDependencyError):
-            vd.check_options(*make_opts_pm(output_type='pdfa-3'))
-
-    with patch('ocrmypdf._exec.ghostscript.version', return_value='9.24'):
-        with pytest.raises(MissingDependencyError):
-            vd.check_options(*make_opts_pm())
-
-
 def test_old_tesseract_error():
     with patch('ocrmypdf._exec.tesseract.version', return_value='4.00.00alpha'):
         with pytest.raises(MissingDependencyError):