So far the first step is basically finished [1]. Probably some small changes
are needed and/or some areas better explained.
Please take a look and submit comments about its readability and comprehension.
Some of the second phase of this roadmap might change once the current render
system is understood by anyone.
Now we are in a critical point. Each decision taken by now will affect the
final result.
The next steps are:
a) Read and check the current render system workflow. Polish its description.
b) Propose integration of Cairo render describing the modifications/additions
needed in the code and the new flow diagram.
Once those steps are done and agreed the coding phase will start.
Cheers!
[1] https://docs.google.com/document/d/1NTS5ywi_khAj-14cYfc9KLmUMDNnh3fKooZ-m3nBwgU/edit
________________________________
De: Carlos López González <genet...@gmail.com>
Para: synfig-devl@lists.sourceforge.net
Enviado: Viernes 11 de Mayo de 2012 11:11
Asunto: [Synfig-devl] Cairo implementation roadmap
Hi!
I would like to keep you informed about the progresses of the Cairo render
implementation.
So far I've been reading code the last days and finally I started to have a
better idea of how does the current render system works. From my point of view
it is absolutely needed to fully understand the current one before attempt to
code the next one.
After people has returned from the 2012 LGM, the idea of use GEGL as
replacement for current Synfig's raster operation has taken more value so it is
worth to keep a slot to it here.
So my roadmap (without due date) for the revamping of the Synfig's render
system is this:
1) Write down the current render system flow diagram. It would be enough
detailed to be able to know how the data is transferred from memory to the
final render place and its data type conversions. At the same time it should be
as simple as possible to allow to understand it to a person without deep code
knowledge.
2) Taking in mind the following problems/solutions (see below) create a new
flow diagram to implement the new render system:
a) Use Cairo draw primitives and raster manipulation when possible.
b) Cairo color data is not the same than some sources and target datas. A data
conversion might be needed or alternatively the non supported types discarded.
Use Cairo member functions to render to specific targets when available (png,
screen, pdf, etc.)
c) Current blend methods are not fully supported by Cairo library. Something
has to be done on this.
d) If possible try to use GEGL on raster operations not supported by Cairo as
alternative to current render system. Maybe blend methods can be done always by
a GEGL operation?
3) Once defined the new flow diagram for the new render system, divide the
tasks that can be done in parallel between the brave coders (aka myself,
nikitakit and eldruin - and anyone who want to join! - ) and implement it.
4) During earlier phases of step 3) there should be defined a benchmarking
system and quality to maintain the goodness of the implementation of the new
render system.
I'll take charge of the task 1) for the current render system. Nikitakit is
willing to research about blend methods to see how far can we get with Cairo
(and maybe GEGL?). I would like to count with nikitakit and eldruin for the
next steps and with you who are reading for testing purposes.
Let's see what happen!
Cheers!
--
Carlos
http://synfig.org
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