CustomData color copying: use interpolated alpha

The alpha of the first layer was always used
here since introduction in rBee4453f08369 and was not updated when
customdata support for alpha was added.

Now also use the interpolated alpha.

thx @brecht noticing!

ref T81914

Reviewers: brecht, mont29

Maniphest Tasks: T81914

Differential Revision: https://developer.blender.org/D9358

1 files changed, 5 insertions, 4 deletions

diff --git a/source/blender/blenkernel/intern/customdata.c b/source/blender/blenkernel/intern/customdata.c
index 466a0115a9d..d762b1b0604 100644
--- a/source/blender/blenkernel/intern/customdata.c
+++ b/source/blender/blenkernel/intern/customdata.c
@@ -751,6 +751,7 @@ static void layerCopyValue_mloopcol(const void *source,
     m2->r = m1->r;
     m2->g = m1->g;
     m2->b = m1->b;
+    m2->a = m1->a;
   }
   else { /* Modes that support 'real' mix factor. */
     unsigned char src[4] = {m1->r, m1->g, m1->b, m1->a};
@@ -771,13 +772,14 @@ static void layerCopyValue_mloopcol(const void *source,
     else {
       memcpy(tmp_col, src, sizeof(tmp_col));
     }
+
     blend_color_interpolate_byte(dst, dst, tmp_col, mixfactor);
 
     m2->r = (char)dst[0];
     m2->g = (char)dst[1];
     m2->b = (char)dst[2];
+    m2->a = (char)dst[3];
   }
-  m2->a = m1->a;
 }
 
 static bool layerEqual_mloopcol(const void *data1, const void *data2)
@@ -1281,7 +1283,7 @@ static void layerCopyValue_propcol(const void *source,
         return; /* Do Nothing! */
       }
     }
-    copy_v3_v3(m2->color, m1->color);
+    copy_v4_v4(m2->color, m1->color);
   }
   else { /* Modes that support 'real' mix factor. */
     if (mixmode == CDT_MIX_MIX) {
@@ -1301,9 +1303,8 @@ static void layerCopyValue_propcol(const void *source,
     }
     blend_color_interpolate_float(m2->color, m2->color, tmp_col, mixfactor);
 
-    copy_v3_v3(m2->color, m1->color);
+    copy_v4_v4(m2->color, m1->color);
   }
-  m2->color[3] = m1->color[3];
 }
 
 static bool layerEqual_propcol(const void *data1, const void *data2)