static void
_f_do_barnacle_install_properties(GObjectClass
*gobject_class)
{
GParamSpec *pspec;
/* Party code attribute */
pspec = g_param_spec_uint64
(F_DO_BARNACLE_CODE,
"Barnacle code.",
"Barnacle code",
0,
G_MAXUINT64,
G_MAXUINT64 /*
default value */,
G_PARAM_READABLE
| G_PARAM_WRITABLE |
G_PARAM_PRIVATE);
g_object_class_install_property (gobject_class,
F_DO_BARNACLE_PROP_CODE,
WPE: a WebKit port
optimized for embedded

What is WPE?
● Web Platform for Embedded: a complete platform to run
several services (plugins) on embedded devices
(https://github.com/WebPlatformForEmbedded)
● Buildroot clone and yocto recipes
● WPE Framework: plugin/service launcher
– WPE Compositor: Wayland based window
compositor
– WPE WebKit: web browser
– And several more: TVControl, Netflix, etc
● WPE UI Framework: app development framework
● WPE Test Framework

What is WPE?
● WPE is also the name of the official WebKit port
for Embedded
● Stored in the official WebKit repository
(upstream)
● By default targeted for desktop environments
using Wayland
● Inside Web Platform for Embedded, it’s cloned as
WPE Webkit
● Downstream repository with embedded specific
patches

History
● Born as an alternative to QtWebKit
● Not an official WebKit port anymore
● Current versions not updated since years ago
● QtWebEngine license issues (LGPLv3)
● Goal: up to date browser that can run on different
hardware with small adaptations
● Fast
● Minimal dependencies
● Fullscreen single tab content

Full Featured Browser
● Most of the common HTML5 features
● WebGL
● Accelerated canvas
● Hardware accelerated CSS 3D transformations
● Hardware accelerated video playback
● And keeps growing

Small Set of Dependencies
● Commonly used GNU Linux libraries
● HarfBuzz, GnuTLS?, pixman, cairo, etc
● GStreamer for media playback
● GLES 2.0 for hardware accelerated rendering
● A functional Raspberry Pi image is about 40MB

Multiprocess and Multithreaded
● Currently using 4 processes (may grow)
● UI Process
● Web Process
● Network Process
● Storage Process
● Intensive threading used inside the processes
● Composition
● Image decoding
● Media playback
● etc

Targeting Low Performance HW
● Low memory footprint
● It’s possible to define limits to the memory
consumption
● Able to play youtube.tv on an Raspberry Pi 0/1
● Using textured video
● Raspberry Pi 0/1 is ~1000 DMIPS

Adaptable to Different Hardware
● Requires appropriate GStreamer plugins
● Graphics backend abstraction: a backend
defines a way to create/share/display graphics
buffers
● Raspberry Pi 0/1/2/3
● Broadcom Nexus
● Wayland

Multimedia
● Hardware accelerated decoding where
Gstreamer plugins are available (Raspberry Pi
and Broadcom Nexus)
● Hardware accelerated video rendering using
GLES (allows CSS 3D transformations on the
video)
● External rendering (hole punch) when required

Multimedia: MSE
● Latest version of the spec supported
● Mp4 support implemented, webm under
development
● Youtube leanback conformance
● 2016 supported
● 2018 under development

Multimedia: EME
● V1: supported with ClearKey and PlayReady
● V3: under development
● ClearKey
● PlayReady (using OpenCDM)
● Widevine (using OpenCDM)

WebRTC
● Prototype implemented using OpenWebRTC
(finally dropped)
● Currently libwebrtc support is being added
(working on it together with Apple)

Releasing
● From upstream: source tarballs every 6 weeks
● Periodical merges from upstream repository
into Web Platform for Embedded one
● Currently defining a release policy that include
stable branches and releases

Questions?
Igalia
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