Blender Git Loki

Merge branch 'master' into ui-preview-buttons

Merge branch 'master' into ui-preview-buttons

Tweak docstrings

also including full module path here is a bit odd since its an internal module.

tweaks to Python scripts

Merge branch 'master' into ui-preview-buttons

improving path handling in py samples for ui-previews

Add safety check in PRV_DEFERRED_DATA

Disallow PRV_DEFERRED_DATA to be used when use_deferred is false

changes for over-allocation

use more conventional `pointer + 1` to access over alloc data.
Was confusing having 2 byte trailing member of struct.

Correct accidental sizeof void*/char mismatch

Merge branch 'master' into ui-preview-buttons

Move again GPU init code before UI_init one (since icons use OGL, I assue they need it initiated first).

Oddly enough this did not seem to be an issue, but...

Fix bad alpha - PreviewImage are assumed to be premultiplied...

Fix was correct, but let's be a bit more generic/clear here...

fixing crash with deferred previews

Deferred loading for PreviewImage and icons based on them.

This only works with thumbnails/filepath currently, but later we may extend it with
other 'generated' ways...

When requesting a PreviewImage from path thumbnail, only path (and thumb type) are stored
in over-allocated fashion at end of PreviewImage struct.

Then, calling `BKE_previewimg_ensure()` will take care of loading actual data if needed.
This is only used from RNA currently, however, since we do not want to do that from
main thread in draw icon code.

For drawing code itself, tweaked system already existing for ID previews to also
handle deferred (thumbnails) ones.

Side Note: current job-based preview generation seems really bad to me:
* It is not thread-safe - not at all! Reading **and writing** data from job thread
(IDs, preview's rect, ...), without any protection of course.
* It is badly used and adds a huge overweight (one job **per preview**!!!).
This has to be completely rewriten imho, probably in a similar way as what is done
for filebrowser previews in asset-experiments branch, i.e. using much lighter BLI_task,
and being much stricter about not sharing memory between worker and main threads,
but this is outside of scope for this patch.

Cleanup: #define -> enum, and get rid of useless braces in case's.

DNA; document how to ignore a struct

Add missing TEXTEDIT_UPDATE option

Cleanup: use r_* prefix for return args

Fix T44634: Slide edge not responding to ALT + WHEEL to change reference edge in "even mode".

Modal events (TFM_MODAL_EDGESLIDE_UP/_DOWN) were eaten by NOP generic transform event handling...