MobileRead Forums - View Single Post - Plugin to insert and wrap an image with SVG

KevinH · 11-17-2023, 07:13 PM

I did an internet search on this and blank images in python/tk are usually caused by the image data itself being garbage collected by python. The way to prevent garbage collection of an image object is to keep a pointer to the image around until after the image is displayed/used.

Perhaps that is what is at play here?

In AccessAide which made thumbnail images, I needed to keep a pointer to both the full image and its thumbnail version to prevent both from being destroyed by garbage collection. They were linked. See the code starting here: https://github.com/kevinhendricks/Ac...cessgui.py#L98

In this plugin's code, I see copy() being used on Image objects but I am not sure that will keep a pointer to the original Image data and the thumbnail version.

That might be worth looking into.

11-17-2023, 07:13 PM	#191
KevinH Sigil Developer Posts: 8,884 Karma: 6120478 Join Date: Nov 2009 Device: many	I did an internet search on this and blank images in python/tk are usually caused by the image data itself being garbage collected by python. The way to prevent garbage collection of an image object is to keep a pointer to the image around until after the image is displayed/used. Perhaps that is what is at play here? In AccessAide which made thumbnail images, I needed to keep a pointer to both the full image and its thumbnail version to prevent both from being destroyed by garbage collection. They were linked. See the code starting here: https://github.com/kevinhendricks/Ac...cessgui.py#L98 In this plugin's code, I see copy() being used on Image objects but I am not sure that will keep a pointer to the original Image data and the thumbnail version. That might be worth looking into. Last edited by KevinH; 11-17-2023 at 07:58 PM.