[Bug 205707] Improve parsing of BDFs by vtfontcvt

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205707

Henry Hu <henry.hu.sh at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #180939|0                           |1
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--- Comment #7 from Henry Hu <henry.hu.sh at gmail.com> ---
Created attachment 180943
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180943&action=edit
fix x-position handling

The previous patch has some problems in deciding the x-position of the
character.

The input line seems to have howmany(bb_w, 8) bytes. The bitmap is aligned to
the left, and occupies the left bb_w bits.
The first shift moves the bitmap to the right, now it's right aligned to bit 0.
The parse_bitmap_line() function seems to assume that the glyph occupies the
top dwidth bits. To put the character at bb_x position, the number of bits at
right is howmany(dwidth, 8) * 8 - bb_x - bb_w.

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