[Bf-blender-cvs] [f33107dd3e5] temp-gpencil-fill: GPencil: For Invert filling be sure there are two pixels thickness

[Antonio Vazquez]

Commit: f33107dd3e5a0fcb24a86b4ffbc38dff3d308f3d
Author: Antonio Vazquez
Date:   Mon Feb 8 10:58:24 2021 +0100
Branches: temp-gpencil-fill
https://developer.blender.org/rBf33107dd3e5a0fcb24a86b4ffbc38dff3d308f3d

GPencil: For Invert filling be sure there are two pixels  thickness

Now a pixel is added to get a minimum thickness of 2 pixels. This avoid false contacts with empty pixels.

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

M	source/blender/editors/gpencil/gpencil_fill.c

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

diff --git a/source/blender/editors/gpencil/gpencil_fill.c b/source/blender/editors/gpencil/gpencil_fill.c
index 7ae0027cf13..f595d0f5b35 100644
--- a/source/blender/editors/gpencil/gpencil_fill.c
+++ b/source/blender/editors/gpencil/gpencil_fill.c
@@ -998,18 +998,24 @@ static void gpencil_invert_image(tGPDfill *tgpf)
   ibuf = BKE_image_acquire_ibuf(tgpf->ima, NULL, &lock);
 
   const int maxpixel = (ibuf->x * ibuf->y) - 1;
+  const int center = ibuf->x / 2;
 
   for (int v = maxpixel; v != 0; v--) {
     float color[4];
     get_pixel(ibuf, v, color);
-    /* Green. */
+    /* Green->Red. */
     if (color[1] == 1.0f) {
       set_pixel(ibuf, v, fill_col[0]);
     }
+    /* Red->Green */
     else if (color[0] == 1.0f) {
       set_pixel(ibuf, v, fill_col[1]);
+      /* Add thickness of 2 pixels to avoid too thin lines. */
+      int offset = (v % ibuf->x < center) ? 1 : -1;
+      set_pixel(ibuf, v + offset, fill_col[1]);
     }
     else {
+      /* Set to Transparent. */
       set_pixel(ibuf, v, fill_col[2]);
     }
   }