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Small ImageItem-related improvements#1501

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j9ac9k merged 67 commits intopyqtgraph:masterfrom
outofculture:pr-669-merged
Jan 20, 2021
Merged

Small ImageItem-related improvements#1501
j9ac9k merged 67 commits intopyqtgraph:masterfrom
outofculture:pr-669-merged

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@outofculture
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campagnola and others added 30 commits June 29, 2018 09:06
this should improve performance under windows
use a buffer-qimage so we can avoid allocing so much
this should improve performance under windows
@outofculture
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( Note: this came out of the work in #669 )

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( Also! This PR assumes #1466 gets merged; it's included in what's here. )

@outofculture outofculture changed the title Small makeQImage-related improvements Small ImageItem-related improvements Jan 19, 2021
Conflicts:
	README.md - same line, unrelated changes
	examples/VideoSpeedTest.py - new pyside6 import v. cupy and args at same line
Conflicts:
	pyqtgraph/functions.py - pyside6 checks integrated with these changes
Conflicts:
	pyqtgraph/functions.py - pyqtgraph#667 bugfix trying to get clobbered
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ndarray.dtype check fails erroneously leading to performance degradation

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