parse_bdf_2_1(): Fix negative bit shift offset

If the font width minus the left margin is greater than the number of
bits needed for the character plus the character's x offset, the bit
shift offset will be negative.

For example, with a font width of 17, left margin of 2, character width
of 2 bytes, and character x offset of 1, the following happens:

    x = (font_bbox_w + font_bbox_x) - figure_margin - (bytes_w * 8 + char_bbox_x)
    x = (17 + 0) - 2 - (2 * 8 + 1)
    x = -2

1 files changed, 7 insertions, 2 deletions

diff --git a/bin/bdf2fbcon b/bin/bdf2fbcon
index b2d8d18..de01179 100755
--- a/bin/bdf2fbcon
+++ b/bin/bdf2fbcon
@@ -275,8 +275,13 @@ sub parse_bdf_2_1
 			if ($stmt eq 'ENDCHAR') {
 				$section = BDF_2_1_SECTION_NONE;
 			} else {
-				$font->{'chars'}[$encoding]->{'bitmap'}[$y++] =
-					hex($line) << $x;
+				if ($x ge 0) {
+					$font->{'chars'}[$encoding]->{'bitmap'}[$y++] =
+						hex($line) << $x;
+				} else {
+					$font->{'chars'}[$encoding]->{'bitmap'}[$y++] =
+						hex($line) >> (0 - $x);
+				}
 			}
 		}
 	}