* Allows drag and place workflow in addition to click workflow
* Should be compatible with future use of calling operator and placing
instead of left-clicking
In rB78c491e the `initialize_particle` function was split into 2 parts for particle texture initialization.
The texture init part however also initializes birth times, which is now missing in the main init function
in some cases (notably when setting start/end directly without a subsequent time step).
Blender Internal only uses materials with non-zero user counter for SSS and new
mutable libblock copy was keeping users counter at zero.
Now it sets user counter to 1, which is a bit of arguable decision, but which
also kind of makes sense -- meaning callee owns the copied block.
The cause of the crash was identified in an uninitialized member variable
`Main->lock`. Now that struct Main has a few member variables whose
values are dynamically allocated, per-render Freestyle-specific Main data
structures will be allocated and released using `BKE_main_new()` and
`BKE_main_free()`, respectively.
This revision complements the commit rB6135556f4556.
A bit hackish solution for now, cleaner solution we'll look into as a
part of the new DAG project, when it's clear what kind of data is passed
to the evaluation callbacks.
Probably a leftover from old code, I don't think this invoke usage of VIEW3D_OT_background_image_add
was actually reachable anywhere from the UI, but managed to get it working from py, without increasing
user count...
Preserve buffer form previous runs so it's possible to make
a compo of full frame, then draw a border and start tweaking
nodes and see updates in that border.
Main idea is to make it able to visually compare difference
between what was changed inside the border and how frame
looked before the tweaks outside of the border.
Also implemented Clear Viewer Border in compositor, shortcut
it Ctrl-Alt-B.
Reviewers: lukastoenne, jbakker
CC: venomgfx, sebastian_k
Differential Revision: https://developer.blender.org/D582
Suppress warning for now, it's harmless and only happens
with new libpng.
In the future we might try enabling it for non-datatoc-ed
files, but it's really not worth spending lots of time on.
Objects were hidden in "only render" mode if they were duplicators. This is correct in general, but for particles should be disabled by the "show emitter" option.
