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weston/doc/sphinx/toc/libweston/head.rst

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doc: output management sequence diagrams When we were designing the libweston output API, I wrote a design document as a Phabricator wiki page. Phabricator is no longer accessible so that information needs to be migrated to a new place. Here I am converting most of it into libweston Sphinx documentation, particularly pulling in the sequence diagrams I drew. This should help people understand how libweston output configuration works. The diagrams are committed as both MSC source files and rendered PNG files. I did not bother tinkering with the build to run mscgen automatically and then with the CI images to install the tool. The Sphinx configuration need numref explicitly enabled so that figures are automatically numbered and can be referenced by their number rather than their whole caption text(!). The document structure is changed a little better flowing with Output Management being the overview page and the Heads and Outputs being the API pages. First I wrote the struct weston_output and weston_head descriptions in Doxygen comments in libweston.h, but then in the API page that text would have been buried somewhere towards the end of the page. So I put that text in ReST instead where it comes as first on the pages as it should. The doc for the structs only contain a link to the top of the page. Yes, the comment style in libweston.h is a little broken. If I left the asterisk there it would show up as a bullet point in Sphinx. OTOH putting everything from \rst in a single line did not produce anything. Because Sphinx cannot look in two places, the images need to be copied into the build dir too. mscgen: http://www.mcternan.me.uk/mscgen/ Fixes: https://gitlab.freedesktop.org/wayland/weston/issues/25 Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
5 years ago
.. _libweston-head:
build: Add sphinx/breathe support for generating documentation This is adds basic configuration files for doxygen and for breathe, which is a doxygen-to-sphinx bridge that can document C symbols. Breathe is configured with default project 'weston' and implicitly adds :members: and :undoc-members: to breathe configuration options. This allows a shorter way to call breathe directives without the need specify the project and also to display implicitly all the members, documented or not. A 'docs' run_target to force the docs to be re-built has been added. Initially (the first time the build system is ran) the documentation will automatically be built, but later re-builds will require the use of the 'docs' target. This avoid further delays in building weston but in the same time allows the possiblity to update/improve the documentation bits to those who want that. Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
5 years ago
doc: output management sequence diagrams When we were designing the libweston output API, I wrote a design document as a Phabricator wiki page. Phabricator is no longer accessible so that information needs to be migrated to a new place. Here I am converting most of it into libweston Sphinx documentation, particularly pulling in the sequence diagrams I drew. This should help people understand how libweston output configuration works. The diagrams are committed as both MSC source files and rendered PNG files. I did not bother tinkering with the build to run mscgen automatically and then with the CI images to install the tool. The Sphinx configuration need numref explicitly enabled so that figures are automatically numbered and can be referenced by their number rather than their whole caption text(!). The document structure is changed a little better flowing with Output Management being the overview page and the Heads and Outputs being the API pages. First I wrote the struct weston_output and weston_head descriptions in Doxygen comments in libweston.h, but then in the API page that text would have been buried somewhere towards the end of the page. So I put that text in ReST instead where it comes as first on the pages as it should. The doc for the structs only contain a link to the top of the page. Yes, the comment style in libweston.h is a little broken. If I left the asterisk there it would show up as a bullet point in Sphinx. OTOH putting everything from \rst in a single line did not produce anything. Because Sphinx cannot look in two places, the images need to be copied into the build dir too. mscgen: http://www.mcternan.me.uk/mscgen/ Fixes: https://gitlab.freedesktop.org/wayland/weston/issues/25 Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
5 years ago
Heads
=====
A head is represented by a :type:`weston_head` object.
A head refers to a monitor when driving hardware, but it can also be a window
in another window system, or a virtual concept. Essentially a head is a place
where you could present an image. The image will be produced by a weston_output
where the head is attached to.
In display hardware, a head represents a display connector in a computer
system, not the actual monitor connected to the connector. A head carries
monitor information, if present, like make and model, EDID and possible video
modes. Other properties are DPMS mode and backlight control.
In terms of Wayland protocol, a head corresponds to a wl_output. If one
:type:`weston_output` has several heads, meaning that the heads are cloned,
each head is represented as a separate wl_output global in wl_registry. Only
the heads of an enabled output are exposed as wl_outputs.
Heads can appear and disappear dynamically, mainly because of DisplayPort
Multi-Stream Transport where connecting a new monitor may expose new
connectors. Window and virtual outputs are often dynamic as well.
Heads are always owned by libweston which dictates their lifetimes. Some
backends may offer specific API to create and destroy heads, but hardware
backends like DRM-backend create and destroy heads on their own.
build: Add sphinx/breathe support for generating documentation This is adds basic configuration files for doxygen and for breathe, which is a doxygen-to-sphinx bridge that can document C symbols. Breathe is configured with default project 'weston' and implicitly adds :members: and :undoc-members: to breathe configuration options. This allows a shorter way to call breathe directives without the need specify the project and also to display implicitly all the members, documented or not. A 'docs' run_target to force the docs to be re-built has been added. Initially (the first time the build system is ran) the documentation will automatically be built, but later re-builds will require the use of the 'docs' target. This avoid further delays in building weston but in the same time allows the possiblity to update/improve the documentation bits to those who want that. Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
5 years ago
.. note::
:func:`weston_head_init` and :func:`weston_head_release` belong to the
private/internal backend API and should be moved accordingly once that
doc: output management sequence diagrams When we were designing the libweston output API, I wrote a design document as a Phabricator wiki page. Phabricator is no longer accessible so that information needs to be migrated to a new place. Here I am converting most of it into libweston Sphinx documentation, particularly pulling in the sequence diagrams I drew. This should help people understand how libweston output configuration works. The diagrams are committed as both MSC source files and rendered PNG files. I did not bother tinkering with the build to run mscgen automatically and then with the CI images to install the tool. The Sphinx configuration need numref explicitly enabled so that figures are automatically numbered and can be referenced by their number rather than their whole caption text(!). The document structure is changed a little better flowing with Output Management being the overview page and the Heads and Outputs being the API pages. First I wrote the struct weston_output and weston_head descriptions in Doxygen comments in libweston.h, but then in the API page that text would have been buried somewhere towards the end of the page. So I put that text in ReST instead where it comes as first on the pages as it should. The doc for the structs only contain a link to the top of the page. Yes, the comment style in libweston.h is a little broken. If I left the asterisk there it would show up as a bullet point in Sphinx. OTOH putting everything from \rst in a single line did not produce anything. Because Sphinx cannot look in two places, the images need to be copied into the build dir too. mscgen: http://www.mcternan.me.uk/mscgen/ Fixes: https://gitlab.freedesktop.org/wayland/weston/issues/25 Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
5 years ago
section has been created. There are many other functions as well that are
intended only for backends.
build: Add sphinx/breathe support for generating documentation This is adds basic configuration files for doxygen and for breathe, which is a doxygen-to-sphinx bridge that can document C symbols. Breathe is configured with default project 'weston' and implicitly adds :members: and :undoc-members: to breathe configuration options. This allows a shorter way to call breathe directives without the need specify the project and also to display implicitly all the members, documented or not. A 'docs' run_target to force the docs to be re-built has been added. Initially (the first time the build system is ran) the documentation will automatically be built, but later re-builds will require the use of the 'docs' target. This avoid further delays in building weston but in the same time allows the possiblity to update/improve the documentation bits to those who want that. Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
5 years ago
A :type:`weston_head` must be attached/detached from a :type:`weston_output`.
To that purpose you can use :func:`weston_output_attach_head`, respectively
:func:`weston_head_detach`.
doc/sphinx: Add 'weston_compositor', 'weston_output' and 'weston_head' API Demonstrates how to call/use the 'doxygen*' breathe directives. Make use of previous patches that tag symbols using 'ingroup' doxygen command. Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
5 years ago
.. doxygengroup:: head
:content-only: