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The Servo Browser Engine
f7d2fb6ff8
Although the computed `display` property of elements with `position: absolute` is `block`, `position: absolute; display: inline` can still behave differently from `position: absolute; display: block`. This is because the hypothetical box for `position: absolute` can be at the position it would have been if it had `display: inline`. CSS 2.1 § 10.3.7 describes this case in a parenthetical: "The static-position containing block is the containing block of a hypothetical box that would have been the first box of the element if its specified 'position' value had been 'static' and its specified 'float' had been 'none'. (Note that due to the rules in section 9.7 this hypothetical calculation might require also assuming a different computed value for 'display'.)" To handle this, I had to change both style computation and layout. For the former, I added an internal property `-servo-display-for-hypothetical-box`, which stores the `display` value supplied by the author, before the computed value is calculated. Flow construction now uses this value. As for layout, implementing the proper behavior is tricky because the position of an inline fragment in the inline direction cannot be determined until height assignment, which is a parallelism hazard because in parallel layout widths are computed before heights. However, in this particular case we can avoid the parallelism hazard because the inline direction of a hypothetical box only affects the layout if an absolutely-positioned element is unconstrained in the inline direction. Therefore, we can just lay out such absolutely-positioned elements with a bogus inline position and fix it up once the true inline position of the hypothetical box is computed. The name for this fix-up process is "late computation of inline position" (and the corresponding fix-up for the block position is called "late computation of block position"). This improves the header on /r/rust. r? @glennw |
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| .cargo | ||
| components | ||
| etc | ||
| ports | ||
| python | ||
| src | ||
| support | ||
| tests | ||
| .gitignore | ||
| .gitmodules | ||
| Cargo.lock | ||
| Cargo.toml | ||
| CONTRIBUTING.md | ||
| Info.plist | ||
| LICENSE | ||
| mach | ||
| ORGANIZATION.md | ||
| README.md | ||
| rust-snapshot-hash | ||
| servobuild.example | ||
The Servo Parallel Browser Project
Servo is a prototype web browser engine written in the Rust language. It is currently developed on 64bit OS X, 64bit Linux, and Android.
Servo welcomes contribution from everyone. See
CONTRIBUTING.md for help getting started.
Prerequisites
Note, on systems without glfw3 packages, you can compile from source. An example can be found in the TravisCI install script.
On OS X (homebrew):
brew install automake pkg-config python glfw3
pip install virtualenv
On OS X (MacPorts):
sudo port install python27 py27-virtualenv
On Debian-based Linuxes:
sudo apt-get install curl freeglut3-dev \
libfreetype6-dev libgl1-mesa-dri libglib2.0-dev xorg-dev \
msttcorefonts gperf g++ cmake python-virtualenv \
libssl-dev libglfw3-dev
On Fedora:
sudo yum install curl freeglut-devel libtool gcc-c++ libXi-devel \
freetype-devel mesa-libGL-devel glib2-devel libX11-devel libXrandr-devel gperf \
fontconfig-devel cabextract ttmkfdir python python-virtualenv expat-devel \
rpm-build openssl-devel glfw-devel
pushd .
cd /tmp
wget http://corefonts.sourceforge.net/msttcorefonts-2.5-1.spec
rpmbuild -bb msttcorefonts-2.5-1.spec
sudo yum install $HOME/rpmbuild/RPMS/noarch/msttcorefonts-2.5-1.noarch.rpm
popd
On Arch Linux:
sudo pacman -S base-devel git python2 python2-virtualenv mesa glfw ttf-font
Cross-compilation for Android:
Pre-installed Android tools are needed. See wiki for details
The Rust compiler
Servo uses a snapshot Rust compiler to build itself. This is normally a
specific revision of Rust upstream, but sometimes has a backported patch or
two. If you'd like to know the snapshot revision of Rust which we use, see
./rust-snapshot-hash.
Building
Servo is built with Cargo, the Rust package manager. We also use Mozilla's Mach tools to orchestrate the build and other tasks.
Normal build
git clone https://github.com/servo/servo
cd servo
./mach build
./mach run tests/html/about-mozilla.html
Building for Android target
git clone https://github.com/servo/servo
cd servo
ANDROID_TOOLCHAIN=/path/to/toolchain ANDROID_NDK=/path/to/ndk PATH=$PATH:/path/to/toolchain/bin ./mach build --target arm-linux-androideabi
cd ports/android
ANDROID_NDK=/path/to/ndk ANDROID_SDK=/path/to/sdk make
ANDROID_SDK=/path/to/sdk make install
Running
Commandline Arguments
-p INTERVALturns on the profiler and dumps info to the console everyINTERVALseconds-s SIZEsets the tile size for rendering; defaults to 512-zdisables all graphical output; useful for running JS / layout tests
Keyboard Shortcuts
Ctrl-Lopens a dialog to browse to a new URL (Mac only currently)Ctrl--zooms outCtrl-=zooms inBackspacegoes backwards in the historyShift-Backspacegoes forwards in the historyEscexits servo
Developing
There are lots of mach commands you can use. You can list them with ./mach --help.