58e0ca99a9
Image operation's get_im_buf() function was not thread-safe: - It had TOCTOU issue around calculating multi-layer indices and requesting to load the image buffer. - It accessed render result, render layer and pass pointers without any thread guards. This change moves all the logic needed to access the image buffer into a single function with proper guards around the access. The result is user-counted, so it is usable in a thread even if another thread modifies the image. The is still potential TOCTOU in the compositor since the image is acquired twice: once from init_execution(), and once from the determine_canvas(). It could cause issues if image resolution is changed between these calls. It is still to be looked into. Ref #118337, #121761
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