preview: QtPreview: Fix black level; optimize and tidy. #454
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Implement luma offset for limited-range colourspaces (it makes a just-visible difference to black level in "libcamera-vid"). Claw back the increased complexity with some minor optimizations. Rather than fix the (previously unintended?) U,V offset sharing, it has been made blatant to avoid further slowdown. Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>
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Implement luma offset for limited-range colourspaces (it makes a just-visible difference to black level in "libcamera-vid"). Claw back the increased complexity with some minor optimizations.
Rather than fix the (previously unintended?) U,V offset sharing, it has been made blatant to avoid further slowdown.
Signed-off-by: Nick Hollinghurst nick.hollinghurst@raspberrypi.com