UI: Automatic Blend Thumbnail Selection

Adds an "Auto" option to blend thumbnail types that will automatically
use Screenshot if there is no camera and 3dview, or workbench render
with shading settings from the largest 3dview.

See D12407 for more details.

Differential Revision: https://developer.blender.org/D12407

Reviewed by Campbell Barton

1 files changed, 27 insertions, 11 deletions

diff --git a/source/blender/windowmanager/intern/wm_files.c b/source/blender/windowmanager/intern/wm_files.c
index 6dde7a427bc..2ce2bcc2f3c 100644
--- a/source/blender/windowmanager/intern/wm_files.c
+++ b/source/blender/windowmanager/intern/wm_files.c
@@ -1602,10 +1602,9 @@ static ImBuf *blend_file_thumb_from_camera(const bContext *C,
     return NULL;
   }
 
-  if ((scene->camera == NULL) && (screen != NULL)) {
+  if (screen != NULL) {
     area = BKE_screen_find_big_area(screen, SPACE_VIEW3D, 0);
-    region = BKE_area_find_region_type(area, RGN_TYPE_WINDOW);
-    if (region) {
+    if (area) {
       v3d = area->spacedata.first;
     }
   }
@@ -1624,13 +1623,14 @@ static ImBuf *blend_file_thumb_from_camera(const bContext *C,
   if (scene->camera) {
     ibuf = ED_view3d_draw_offscreen_imbuf_simple(depsgraph,
                                                  scene,
-                                                 NULL,
-                                                 OB_SOLID,
+                                                 (v3d) ? &v3d->shading : NULL,
+                                                 (v3d) ? v3d->shading.type : OB_SOLID,
                                                  scene->camera,
                                                  PREVIEW_RENDER_LARGE_HEIGHT * 2,
                                                  PREVIEW_RENDER_LARGE_HEIGHT * 2,
                                                  IB_rect,
-                                                 V3D_OFSDRAW_NONE,
+                                                 (v3d) ? V3D_OFSDRAW_OVERRIDE_SCENE_SETTINGS :
+                                                         V3D_OFSDRAW_NONE,
                                                  R_ALPHAPREMUL,
                                                  NULL,
                                                  NULL,
@@ -1766,12 +1766,28 @@ static bool wm_file_write(bContext *C,
   /* Main now can store a '.blend' thumbnail, useful for background mode
    * or thumbnail customization. */
   main_thumb = thumb = bmain->blen_thumb;
-  if (BLI_thread_is_main()) {
-    if (U.file_preview_type == USER_FILE_PREVIEW_SCREENSHOT) {
-      ibuf_thumb = blend_file_thumb_from_screenshot(C, &thumb);
+  if (BLI_thread_is_main() && U.file_preview_type != USER_FILE_PREVIEW_NONE) {
+
+    int file_preview_type = U.file_preview_type;
+
+    if (file_preview_type == USER_FILE_PREVIEW_AUTO) {
+      Scene *scene = CTX_data_scene(C);
+      bool do_render = (scene != NULL && scene->camera != NULL &&
+                        (BKE_screen_find_big_area(CTX_wm_screen(C), SPACE_VIEW3D, 0) != NULL));
+      file_preview_type = do_render ? USER_FILE_PREVIEW_CAMERA : USER_FILE_PREVIEW_SCREENSHOT;
     }
-    else if (U.file_preview_type == USER_FILE_PREVIEW_CAMERA) {
-      ibuf_thumb = blend_file_thumb_from_camera(C, CTX_data_scene(C), CTX_wm_screen(C), &thumb);
+
+    switch (file_preview_type) {
+      case USER_FILE_PREVIEW_SCREENSHOT: {
+        ibuf_thumb = blend_file_thumb_from_screenshot(C, &thumb);
+        break;
+      }
+      case USER_FILE_PREVIEW_CAMERA: {
+        ibuf_thumb = blend_file_thumb_from_camera(C, CTX_data_scene(C), CTX_wm_screen(C), &thumb);
+        break;
+      }
+      default:
+        BLI_assert_unreachable();
     }
   }