Nyall Dawson ddd357c2ea Add API to QgsRasterBlock to obtain both pixel value AND no data
flag in a single call

This is much more efficient then making two calls, since the
QgsRasterBlock::isNoData() check internally calls QgsRasterBlock::value().
So by requiring API users to make the two separate calls individually,
we double the time this process takes...
2019-01-22 12:13:39 +11:00
..
2018-05-14 11:02:28 -04:00