# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1540482938 -10800
# Node ID c8c698bb99b63f94d1a8288364d0a34658ec9dcf
# Parent  57a2527ff63d53ba7fe28e4f56f1b316f1b44f5b
Calculate number of required bitplanes more correctly.

diff -r 57a2527ff63d -r c8c698bb99b6 tools/gfxconv.c
--- a/tools/gfxconv.c	Thu Oct 25 18:47:10 2018 +0300
+++ b/tools/gfxconv.c	Thu Oct 25 18:55:38 2018 +0300
@@ -1381,9 +1381,9 @@
             spec->nplanes = 0;
             for (int n = 8; n >= 0;)
             {
-                if (image->ncolors & (1 << n))
+                if ((image->ncolors - 1) & (1 << n))
                 {
-                    spec->nplanes = n;
+                    spec->nplanes = n + 1;
                     break;
                 }
                 else