contributing.rst: remove the projects; they are already in gitlab issues

I'll probably make another chapter to highlight particularly
interesting/big projects.

1 files changed, 0 insertions, 103 deletions

diff --git a/devel-docs/contributing.rst b/devel-docs/contributing.rst
index 576f63c2..76df9040 100644
--- a/devel-docs/contributing.rst
+++ b/devel-docs/contributing.rst
@@ -2,106 +2,3 @@
 How you can contribute to librsvg
 *********************************
 
-Here are some projects that you can choose to contribute to librsvg.
-
-Major features
-==============
-
-These are big features that may take you a few months to implement.
-Fame and glory await! :)
-
-Support CSS var()
------------------
-
-This project is suitable for a few months of work, like an Outreachy
-or Summer of Code internship.  Some familiarity with CSS will be
-useful; you don't need to be an expert in it.  You need to be able to
-write Rust relatively fluently.
-
-This is https://gitlab.gnome.org/GNOME/librsvg/-/issues/459 - In
-summary, support for var() lets CSS styles reference values defined
-elsewhere, instead of hard-coding an actual value in every place it is
-used.  For example, define a ``button-color`` variable instead of
-hard-coding ``#aabbcc`` everywhere.
-
-.. code-block:: css
-
-   /* Define two variables */
-   :root {
-     --main-color: #06c;
-     --accent-color: #006;
-   }
-
-   /* The rest of the CSS file */
-   #foo h1 {
-     fill: var(--main-color);
-   }
-
-In the context of librsvg, this would be useful in several situations:
-
-- Allow toolkits to specify a user stylesheet while rendering a
-  document, to recolor items in SVGs for icons.  They can already do
-  this by using CSS selectors (e.g. change the fill color in elements
-  that have the ``button`` class), but CSS ``var()`` would be nice for
-  flexibility.
-
-- Part of supporting `SVG Native`_ involves adding support for
-  ``var()``.  This is useful for emoji fonts which include glyphs in
-  SVG format.
-
-There is a pretty complete in `implementation in Servo`_.  You can use
-it for inspiration, or cut&paste it into librsvg; it will need some
-changes, and probably also some additions to librsvg's existing
-machinery for CSS.
-
-One particularly interesting bit in Servo's implementation is that it guards against exponential expansion of malicious variables.
-
-.. code-block:: css
-
-   :root {
-     --prop1: lol;
-     --prop2: var(--prop1) var(--prop1);
-     --prop3: var(--prop2) var(--prop2);
-     --prop4: var(--prop3) var(--prop3);
-     /* expand to --prop30 */
-   }
-
-A naive implementation would make the consume a few gigabytes of
-memory; grep for "exponentially" in Servo's code to see how it guards
-against that.
-
-.. _SVG Native: https://gitlab.gnome.org/GNOME/librsvg/-/issues/689
-
-.. _implementation in Servo: https://github.com/servo/servo/blob/master/components/style/custom_properties.rs
-
-Support CSS calc()
-------------------
-
-This project is suitable for a few months of work, like an Outreachy
-or Summer of Code internship.
-
-Some familiarity with CSS will be useful; you don't need to be an
-expert in it.  You need to be able to write Rust relatively fluently.
-It will be very useful to have some familiarity with implementing
-simple interpreters or evaluators - for example, parsing and computing
-an expression like ``5 + 3 * (2 - 4)``; if you have already written a
-parser and Abstract Syntax Tree for that kind of thing, this project
-will be a lot easier.
-
-This is https://gitlab.gnome.org/GNOME/librsvg/-/issues/843 - support
-calc() expressions in CSS.  For example, parameterize an element's
-width by using ``width="calc(100% - 40px)"`` (this would use the
-viewport's width of 100%, and subtract 40 pixels).
-
-The issue linked in the previous paragraph has plenty of
-implementation advice.  It requires some substantial preliminary work,
-like completing the separation between specified values and computed
-values in librsvg's CSS implementation.  Please ask the maintainer to
-prioritize this work if you intend to implement CSS calc().
-
-Performance tracking
---------------------
-
-See the - :doc:`performance_tracking` document.  This does not involve
-hacking on librsvg itself, but rather creating an infrastructure to
-track performance metrics.