Assets: Preview rendering for Action datablocks

Render previews for Action datablocks by rendering the scene camera with
the Workbench (solid) engine. The //look// can be configured by setting
the scene's render engine to Workbench and editing the scene's shading
properties.

It is assumed that the pose has already been applied and that the scene
camera is capturing the pose. In other words, the render function just
renders from the scene camera without evaluating/applying the Action
stored in `preview->id`. The ID is only used to determine its type and
to store the resulting preview.

Not all code paths that lead to the `action_preview_render()` function
actually provide a depsgraph. The "Refresh Asset Preview" button
(`ED_OT_lib_id_generate_preview`) does, but `WM_OT_previews_ensure` does
not.

Reviewed By: Severin

Differential Revision: https://developer.blender.org/D10543

1 files changed, 7 insertions, 2 deletions

diff --git a/source/blender/editors/interface/interface_icons.c b/source/blender/editors/interface/interface_icons.c
index 1739035f92c..c16c3d2c49a 100644
--- a/source/blender/editors/interface/interface_icons.c
+++ b/source/blender/editors/interface/interface_icons.c
@@ -1426,8 +1426,13 @@ static void icon_set_image(const bContext *C,
       scene = CTX_data_scene(C);
     }
     /* Immediate version */
-    ED_preview_icon_render(
-        CTX_data_main(C), scene, id, prv_img->rect[size], prv_img->w[size], prv_img->h[size]);
+    ED_preview_icon_render(CTX_data_main(C),
+                           CTX_data_ensure_evaluated_depsgraph(C),
+                           scene,
+                           id,
+                           prv_img->rect[size],
+                           prv_img->w[size],
+                           prv_img->h[size]);
   }
 }