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Use older flags with older GhostScript versions

https://ghostscript.readthedocs.io/en/latest/Devices.html#:~:text=We%20now%20recommend%20that%20people%20use%20the%20png16malpha%20device

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lib/matplotlib/testing
- compare.py

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+12

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`‎lib/matplotlib/testing/compare.py`

Lines changed: 12 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -17,6 +17,7 @@`
`17`	`17`
`18`	`18`	`importnumpyasnp`
`19`	`19`	`fromPILimportImage`
	`20`	`+importpackaging.version`
`20`	`21`
`21`	`22`	`importmatplotlibasmpl`
`22`	`23`	`frommatplotlibimportcbook`
`@@ -56,7 +57,7 @@ def get_file_hash(path, block_size=2 ** 20):`
`56`	`57`
`57`	`58`	`ifPath(path).suffix=='.pdf':`
`58`	`59`	`sha256.update(str(mpl._get_executable_info("gs").version).encode('utf-8'))`
`59`		`-sha256.update(b"r600")# invalidate old cache entries`
	`60`	`+sha256.update(b"antialiasing")# invalidate old cache entries`
`60`	`61`	`elifPath(path).suffix=='.svg':`
`61`	`62`	`sha256.update(str(mpl._get_executable_info("inkscape").version).encode('utf-8'))`
`62`	`63`
`@@ -111,14 +112,21 @@ def __call__(self, orig, dest):`
`111`	`112`	`class_GSConverter(_Converter):`
`112`	`113`	`def__call__(self,orig,dest):`
`113`	`114`	`ifnotself._proc:`
	`115`	`+ifmpl._get_executable_info("gs").version<packaging.version.parse("9.57"):`
	`116`	`+antialias= [`
	`117`	`+"-sDEVICE=png16m",`
	`118`	`+"-r150",`
	`119`	`+"-dGraphicsAlphaBits=4",`
	`120`	`+"-dTextAlphaBits=4",`
	`121`	`+ ]`
	`122`	`+else:`
	`123`	`+antialias= ["-sDEVICE=png16malpha","-r600","-dDownScaleFactor=4"]`
`114`	`124`	`self._proc=subprocess.Popen(`
`115`	`125`	`[mpl._get_executable_info("gs").executable,`
`116`	`126`	`"-dNOSAFER",`
`117`	`127`	`"-dNOPAUSE",`
`118`	`128`	`"-dEPSCrop",`
`119`		`-"-sDEVICE=png16malpha",`
`120`		`-"-r600",`
`121`		`-"-dDownScaleFactor=4"],`
	`129`	`+*antialias],`
`122`	`130`	`# As far as I can see, ghostscript never outputs to stderr.`
`123`	`131`	`stdin=subprocess.PIPE,stdout=subprocess.PIPE)`
`124`	`132`	`try:`

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`‎lib/matplotlib/testing/compare.py`

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