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<h1><a href="index.html">FreeType</a> & GSoC</h1>
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<p>The FreeType project has successfully participated at
<a href="https://developers.google.com/open-source/gsoc/">Google
Summer of Code</a>. Here is our ideas list for future
years – if you have another one, please write to
our <a href="mailto:freetype-devel@nongnu.org">mailing
list</a> so that we can discuss your suggestions,
eventually adding them to this page.</p>
<p>If you are interested to participate as a student, please
also contact us via
the <a href="mailto:freetype-devel@nongnu.org">mailing
list</a>. It's probably best if
you <a href="https://lists.nongnu.org/mailman/listinfo/freetype-devel">subscribe</a>
to it.</p>
<p class="warning">Before contacting us, however, you should
get <em>really</em> acquainted with the topic you would
like to start with – in particular, search
the <a href="https://lists.nongnu.org/archive/html/freetype-devel/">mailing
list archive</a> and/or do some googling! We don't want
to answer questions like “I'm interested in your
project, I want to contribute, please tell me what to
do!” again and again…</p>
<dl>
<dt>Develop a test framework for checking FreeType's
rendering output (started as a GSoC 2017 project,
unfinished)</dt>
<dd>
<p>Right now, FreeType's rendering results of the
current development version are not systematically
compared to a baseline version. This is problematic,
since rendering regressions can be very easily missed
due to subtle differences.</p>
<p>The idea is to select a representative set of
reference fonts from font corpora (which already exist
mainly for fuzzing). The fonts are used to produce
glyph images for various sizes and rendering modes
(anti-aliased, B/W, native hinting, auto-hinting,
etc.). FreeType can already produce MD5 checksums of
glyph images as part of its debugging output; these
values should be compared against a baseline version
of rendering results. If there are differences, HTML
pages should be generated that contain comparison
images of the baseline's and the current development
version's rendering result, ideally indicating how
large the differences between the images are by using
some yet to be defined measure.</p>
<p><em>Difficulty:</em> medium. <em>Requirements:</em>
C, Unix build tools. <em>Potential mentors:</em>
Werner Lemberg, Alexei Podtelezhnikov, Toshiya Suzuki
(FreeType).</p>
</dd>
</dl>
<dl>
<dt>Add support for the <code>WOFF2</code> fonts
<dd>
<p>FreeType currently supports WOFF 1.0 fonts,
which are zlib-compressed SFNT fonts. The support for
WOFF 2.0 with improved Brotli compression is lacking.
This project would likely involve the following.
<ul>
<li>Study and compare the specifications how SFNT fonts are
wrapped into <a href=https://www.w3.org/TR/WOFF/>WOFF 1.0</a>
and <a href=https://www.w3.org/TR/WOFF2/>WOFF 2.0</a> files.
Determine if they can be merged.</li>
<li>Explore if it is possible to borrow
<a href=https://github.com/google/woff2>Brotli decoder</a>
donated by Google.</li>
<li>Integrate seamless WOFF2 support into FreeType so that
these fonts can be recognized, decompressed, and opened as
any other SFNT font, without any changes to API.
</ul>
<p><em>Difficulty:</em> medium to
high. <em>Requirements:</em> C, Unix build
tools. <em>Potential mentors:</em> Werner Lemberg,
Alexei Podtelezhnikov, Toshiya Suzuki (FreeType).</p>
</dd>
</dl>
<dl>
<dt>Add support for the ‘<code>SVG </code>’
OpenType table to render color fonts</dt>
<dd>
<p>FreeType currently doesn't have support for fonts
that <a href="https://docs.microsoft.com/en-us/typography/opentype/spec/svg">use
SVG to render color glyphs</a>. The task of this
project would be as follows.</p>
<ul>
<li>Evaluate the freely available SVG libraries that
would fit the job best.</li>
<li>Investigate how to integrate this external library
into FreeType. For example, it should be checked
whether it makes sense to create a new font
rendering module (which would act more or less as a
wrapper to the external SVG library).</li>
<li>If the module approach doesn't fit, define
FreeType API functions and hooks for transferring
data from the font's ‘<code>SVG </code>’
table to the external library. Ditto for
transferring the resulting (bitmap) output back into
FreeType.</li>
<li>Add the necessary infrastructure API stuff (for
example, a function to test whether a font has SVG
glyphs).</li>
</ul>
<p><em>Difficulty:</em> medium to
high. <em>Requirements:</em> C, Unix build
tools. <em>Potential mentors:</em> Werner Lemberg,
Alexei Podtelezhnikov, Toshiya Suzuki (FreeType).</p>
</dd>
</dl>
<dl>
<dt>Improve the ‘ftinspect’ demo program</dt>
<dd>
<p>Right now, FreeType comes with a suite of small
graphic tools to test the library, most notably
‘ftview’ and ‘ftgrid’. The
used graphics library, while working more or less, is
very archaic, not having any comfort that modern GUIs
are providing.</p>
<p>To improve this, a new demo program called
‘ftinspect’ was started, based on the Qt
GUI toolkit. However, the development is currently
stalled, mainly for lack of time.</p>
<p>The idea is to finish ftinspect,
handling <em>all</em> aspects of the other demo
programs. Currently, it only provides the
functionality of ‘ftgrid’.</p>
<p>If the student prefers, the Qt toolkit could be
replaced with GTK.<p>
<p><em>Difficulty:</em> medium. <em>Requirements:</em>
C, C++, Qt, Unix build tools. <em>Potential
mentor:</em> Werner Lemberg (FreeType).</p>
</dd>
</dl>
<dl>
<dt>Replace FreeType's tracing and debugging facilities
with an external logging library</dt>
<dd>
<p>FreeType extensively uses a home-brewed tracing
solution that mainly relies on the C preprocessor
and the <code>fprintf</code> function printing to
<code>stderr</code>. However, this simplistic
approach is not adequate for all platforms, where
<code>stderr</code> is not always easily
accessible.</p>
<p>Many freely available tracing and logging libraries
exist. It would be necessary to test and check which
one meets FreeType's requirements. A few requirements
have already been
<a href="http://lists.nongnu.org/archive/html/freetype-devel/2019-01/msg00023.html">discussed
in the mailing list</a>. Note that this discussion
is by no means exhaustive.</p>
<p>As a rough guideline, the project could be structured
as follows.</p>
<ul>
<li>Get accustomed to FreeType's current
tracer/logger, all its current features, and how it
is currently being used. Extract a few
representative samples from FreeType to help with
the next step.</li>
<li>Evaluate, compare, and discuss freely available
tracing and logging libraries in respect to
FreeType's current tracer/logger.</li>
<li>Replace the old tracer/logger with the new one
within FreeType.</li>
<li>Write a brief but precise ‘how-to’
article for FreeType's website about using the new
tracer/logger which is aimed at FreeType's
developers.</li>
</ul>
<p><em>Difficulty:</em> medium. <em>Requirements:</em>
C, C++, Unix and Windows build tools. <em>Potential
mentors:</em> Werner Lemberg, Alexei Podtelezhnikov,
Toshiya Suzuki (FreeType), Armin Hasitzka.</p>
</dd>
</dl>
<p>Do you have more ideas? Please write to
our <a href="mailto:freetype-devel@nongnu.org">mailing
list</a> so that we can discuss your suggestions,
eventually adding them to the list!</p>
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<p>Last update: 6-Feb-2019</p>
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