Package: bdf2psf
Version: 1.44
Severity: important
In the BDF font format, each glyph's shape is defined in terms of a
bitmap of certain dimensions, located at a certain offset from the
origin. For example, in a font that uses a 12x24 pixel character cell,
the apostrophe glyph (') might only cover 2x4 pixels, and so it could be
represented as a 2x4 bitmap offset upward from the origin, rather than a
12x24 bitmap with no offset and a large number of blank pixels. A wholly
blank glyph could legitimately be represented by a 0x0 bitmap.
This bitmap shrink-wrapping is performed by many tools that deal with
BDF fonts, including gbdfed and otf2bdf. bdf2psf handles it well, except
for the degenerate 0x0 bitmap case.
Steps to reproduce:
1. Get a sample BDF file with an empty bitmap for the U+0020 SPACE glyph:
sudo aptitude install ttf-bitstream-vera otf2bdf
otf2bdf -r 72 -p 12 -c C \
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraMono.ttf |
sed -e "s/AVERAGE_WIDTH.*/AVERAGE_WIDTH 80/" > vera-mono-12.bdf
(the sed invocation is required because bdf2psf sanity-checks the
AVERAGE_WIDTH property rather than the font bounding box, or checking
the DWIDTHs of the glyphs that it actually uses)
2. Convert the BDF file to a PSF file:
bdf2psf vera-mono-12.bdf \
/usr/share/bdf2psf/standard.equivalents \
/usr/share/bdf2psf/required.set+/usr/share/bdf2psf/useful.set \
256 \
vera-mono-12.psf
3. Load the resulting psf file:
consolechars -f vera-mono-12.psf
Expected result:
Character cells containing a U+0020 SPACE glyph should be blank.
Actual result:
Character cells containing a U+0020 SPACE glyph contain random noise, as
though they displayed uninitialised memory.
Note:
If you apply the following patch to the BDF file and re-convert it to
PSF, the resulting font works as expected:
--- vera-mono-12.bdf 2009-07-29 17:19:50.000000000 +1000
+++ vera-mono-12-fixed.bdf 2009-07-29 17:20:38.000000000 +1000
@@ -31,8 +31,9 @@
ENCODING 32
SWIDTH 583 0
DWIDTH 7 0
-BBX 0 0 0 0
+BBX 0 1 0 0
BITMAP
+00
ENDCHAR
STARTCHAR 0021
ENCODING 33
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.26-2-686 (SMP w/1 CPU core)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages bdf2psf depends on:
ii perl 5.10.0-24 Larry Wall's Practical Extraction
bdf2psf recommends no packages.
bdf2psf suggests no packages.
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