We now use a for_each function with callback to iterate through all sequences in the scene.
This has the benefit that we now only loop over the sequences in the scene once.
Before we would loop over them twice and allocate memory to store temporary data.
The allocation of temporary data lead to unintentional memory leaks if the code used returns to exit out of the iteration loop.
The new for_each callback method doesn't allocate any temporary data and only iterates though all sequences once.
Reviewed By: Richard Antalik, Bastien Montagne
Differential Revision: http://developer.blender.org/D12278
Simplify logic of speed effect frame calculation by using discrete math
where possible. Only `SEQ_SPEED_MULTIPLY` mode with animation requires
frame map to be built. Frame map building was simplified by removing
unused branches.
Functional change: Animating strip in negative range will reverse playback.
I assume this was limitation of previous system, where each frame map item
was limited to be within correct frame range. Now frame map can contain
values that point beyond usable range and they are limited by
`seq_speed_effect_target_frame_get`. This way it is possible to control
playback rate in both directions.
Mostly fixes T89120 apart from offset handling.
Reviewed By: mano-wii
Differential Revision: https://developer.blender.org/D11939
Use SEQ_time_strip_intersects_frame function to test if strip intersects with frame.
Note: There are cases where this function should not be used. For example splitting
strips require at least 1 frame "inside" strip. Another example is drawing, where
playhead technically doesn't intersect strip, but it is rendered, because current
frame has "duration" or "thickness" of 1 frame.
Reviewed By: sergey
Differential Revision: https://developer.blender.org/D11320
When cache is strip is invalidated, movie file was reloaded even if it
isn't necessary. This caused significant performance issues when strip
is being dragged under playhead.
This was caused by calling `SEQ_relations_sequence_free_anim()` and it
was introduced as fix for T36124.
When it is necessary to reload file because another API holds reference
to ImBuf, do this explicitly besides cache invalidation.
In `rna_ColorManagedColorspaceSettings_reload_update()` this was already
done, so no change is needed there.
Reviewed By: sergey
Differential Revision: https://developer.blender.org/D11024
Meta strip cache is not invalidated if strip inside of meta strip is
invalidated.
Find all metastrips that contain invalidated strip and invalidate them
recursively.
Reviewed By: sergey
Differential Revision: https://developer.blender.org/D10192
Move most functions into separate files.
File sequencer.c is reserved for alloc, free and duplicating functions.
There should be no functional changes.
