[Bf-blender-cvs] [b64a80edd58] blender-v3.4-release: Fix T103293: GPencil Multiframe Scale affects stroke thickness inversely

[Antonio Vazquez]

Commit: b64a80edd5807f6f1f3800836cbf2996dcdf5230
Author: Antonio Vazquez
Date:   Sat Dec 17 16:35:54 2022 +0100
Branches: blender-v3.4-release
https://developer.blender.org/rBb64a80edd5807f6f1f3800836cbf2996dcdf5230

Fix T103293: GPencil Multiframe Scale affects stroke thickness inversely

The problem was the falloff factor was applied directly
and in the thickness must be inversed. Now the thickess
is calculated using an interpolation.

===================================================================

M	source/blender/editors/transform/transform_mode.c

===================================================================

diff --git a/source/blender/editors/transform/transform_mode.c b/source/blender/editors/transform/transform_mode.c
index aeceedf0690..95d2b4d6439 100644
--- a/source/blender/editors/transform/transform_mode.c
+++ b/source/blender/editors/transform/transform_mode.c
@@ -1029,8 +1029,9 @@ void ElementResize(const TransInfo *t,
       applyNumInput(&num_evil, values_final_evil);
 
       float ratio = values_final_evil[0];
-      *td->val = td->ival * fabs(ratio) * gps->runtime.multi_frame_falloff;
-      CLAMP_MIN(*td->val, 0.001f);
+      float transformed_value = td->ival * fabs(ratio);
+      *td->val = max_ff(interpf(transformed_value, td->ival, gps->runtime.multi_frame_falloff),
+                        0.001f);
     }
   }
   else {