Your message dated Sat, 20 Oct 2018 14:49:43 +0000
with message-id <[email protected]>
and subject line Bug#589601: fixed in ftgl 2.3.0-1
has caused the Debian Bug report #589601,
regarding libftgl2: problems with bitmap fonts etc.
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
589601: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=589601
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: libftgl2
Version: 2.1.3~rc5-3
Severity: normal
Tags: patch
*** Please type your report below this line ***
Most of this report corresponds to Debian bug #531489, with my
patches updated to the current FTGL version in Debian testing.
1. FTPolygonGlyph and FTOutlineGlyph segfault when given a font of a
wrong type, e.g. a bitmap type. This is because vectorizer is
uninitialized, and the constructor in this case returns before
setting it.
My patch (FTPolygonGlyph.cpp, FTOutlineGlyph.cpp) adds the
initialization (copied from FTExtrudeGlyph) and prevents the
crashing.
2. FTPixmapGlyph also doesn't check whether its impl is valid, which
it would not be, again, in case of a bitmap type. In this case,
it doesn't crash (in my tests), but draws garbage.
The patch (FTBitmapGlyphImpl.h, FTPixmapGlyph.h,
FTPixmapGlyph.cpp) adds this check, and in this case just creates
an FTBitmapGlyphImpl and delegates the work to it.
Also I add a check in FTPixmapGlyphImpl for the case of
"num_grays == 1" which is valid according to the specification,
though it might occur rarely. In this case, the font is
effectively a bitmap, and is treated as such.
3. FTBitmapFontImpl disables GL_BLEND. While, of course, it does not
need to enable it, unlike e.g. pixmap fonts, I don't think it's
useful to disable it unconditionally, instead of leaving the
choice to the caller.
The patch (FTBitmapFont.cpp) removes the disabling. If the caller
doesn't explicitly set GL_BLEND, nothing changes, but if they set
it, and set a color with alpha < 1, bitmap fonts can now be drawn
with transparency.
4. Bitmap fonts cannot be used as FTGLTextureFont, which is a
serious disadvantage, since unlike textures, bitmaps cannot be
rotated, scaled, etc. in OpenGL. This in particular affects X11
.pcf fonts. It might also apply to TrueType fonts with embedded
bitmaps: When googling for the problem, I found this message on
the FreeType list:
http://osdir.com/ml/fonts.freetype.devel/2005-03/msg00091.html
It might refer to the same problem, so the diagnosis offered in
the reply might apply to FTGL which was used there as well.
The patch (FTTextureGlyph.cpp) converts bitmaps to pixmaps in
FTTextureGlyphImpl, so they can be used now.
5. (New issue, not in #531489)
FTContour::ComputeOutsetPoint computes an invalid point
(-nan, -nan), when two edges form an angle of nearly 180°.
(I'm not sure if this is somehow invalid according to the spec,
but it actually occurs, e.g., with the "F" character in the font
"El Abogado Loco" as installed in squeeze.) This is because
norm + tmp.X() goes to 0, and therefore the fraction to infinity,
when the angle approaches 180°. It is not merely a numeric
problem, but the intersection point actually goes to infinity.
The visible effect is that drawing such glyphs creates some
spurious lines to the edge of the visual (even if Outset is not
used, because 0 * inf is nan, so it's a regression compared to
previous versions that didn't have Outset).
Since it's an actual geometric problem, there is no obvious
numeric solution. In my patch (FTContour.cpp), I just limit the
outset point's distance (which also avoids ugly results, when the
angle is just somewhat close to 180°, where there is no numeric
problem yet, but the outset point would be very far away from
A, B and C). Another solution might be to insert two outset
points instead of one, say when the angle is > 90° (or < -90°),
but that would be a bigger change.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.34 (SMP w/1 CPU core)
Locale: LANG=de_DE, LC_CTYPE=de_DE (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/dash
Versions of packages libftgl2 depends on:
ii libc6 2.11.2-2 Embedded GNU C Library: Shared lib
ii libfreetype6 2.4.0-1 FreeType 2 font engine, shared lib
ii libgcc1 1:4.4.4-6 GCC support library
ii libgl1-mesa-glx [libgl1 7.7.1-3 A free implementation of the OpenG
ii libglu1-mesa [libglu1] 7.7.1-3 The OpenGL utility library (GLU)
ii libstdc++6 4.4.4-6 The GNU Standard C++ Library v3
ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime
libftgl2 recommends no packages.
libftgl2 suggests no packages.
-- no debconf information
ftgl.patch
Description: Binary data
--- End Message ---
--- Begin Message ---
Source: ftgl
Source-Version: 2.3.0-1
We believe that the bug you reported is fixed in the latest version of
ftgl, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Manuel A. Fernandez Montecelo <[email protected]> (supplier of updated ftgl
package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
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Hash: SHA512
Format: 1.8
Date: Sat, 20 Oct 2018 15:54:55 +0200
Source: ftgl
Binary: libftgl-dev libftgl2
Architecture: source amd64
Version: 2.3.0-1
Distribution: experimental
Urgency: medium
Maintainer: Sam Hocevar <[email protected]>
Changed-By: Manuel A. Fernandez Montecelo <[email protected]>
Description:
libftgl-dev - development files for libftgl
libftgl2 - library to render text in OpenGL using FreeType
Closes: 531489 589601 742469 760571 887712
Changes:
ftgl (2.3.0-1) experimental; urgency=medium
.
* New upstream release
- Closes: #531489, #589601, #742469, #760571
- drop patch patch-ftglgetlayoutbbox-typo.diff, applied upstream
- edit patch fix-pdf-generation to not include Makefile.in, which does
not exist in this new release, and Makefile.am which changed slightly
- refresh patch patch-relibtoolize-prep.diff
- add enable-docs.patch to build docs by default
* Add substitute-freetype-config.patch for new versions of freetype
which do not ship freetype-config (Closes: #887712)
* Add Build-Depends on pkg-config
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