Drawing a transformed image - different behavior in ProTools and when Snapshotting

General JUCE discussion
1

I’m drawing a graph with a complex gradient pattern using a neat trick: it’s simply a 2xN image in memory that I draw with a transform to the correct bounds I want, using Graphics::drawImageTransformed(). That way I get the smooth gradients I want through the interpolation when drawing the image.

Curiously, I found cases where the interpolation isn’t smooth and I get much lower resolution in the result. This happens (so far) in ProTools on macOS (not on Windows), and when I screenshot the editor component using `Component::createComponentSnapshot().

Here’s what it’s supposed to look like:
image

And here’s what I get in ProTools and in screenshot images.

image
image608×570 27.2 KB

The underlying image here is just 2 pixels in width, many pixels in height.

I’ve tried explicitly setting interpolation quality to high, but that doesn’t change anything.

This is with latest-ish JUCE 7, haven’t tried JUCE8 yet.

Any idea what could be different with the drawing in ProTools or when making snapshots?