Is there any way to test whether a given pixel is actually painted on the screen (or eliminated by re-sampling) when zooming (or ImageEnView1 is resized?)
Suppose I have an image that is 2000x1000 that I'm displaying it on the screen in a window that is 500x250. Some of the rows from the bitmap just aren't going to be seen on the screen -- because of resampling that gets done.
It's those rows I want to identify. Why? Because I'm drawing a marque in the bitmap itself before displaying it. Perhaps it's 50x60 and located at 0,0. I want the marque to always be visible, if after resampling (assuming the region is in the visual region.)
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Test if a pixel is visible on screen?
Posted - Jan 06 2018 : 15:15:29
