How does the component (canvas) widht, height auto size work?

[TIMAI2]

This might help:

HOWTO: 1. Set Canvas to Image Dimensions without Extension

[canvassize1] Here a method to get the dimensions / aspect ratio of an image for display in a canvas, without the use of extensions. The same method should also work with image components, buttons and vertical/horizontal arrangements. Set Canvas to Image Dimensions without Extension