WinCairo port is a WebKit port for Windows, which is fully OpenSouce and redistributable unlike AppleWin port. It is using Cairo for the graphics backend, libcurl for the network backend.

Installing Development Tools

You need CMake, Perl, Python 2.7, Ruby, gperf and Visual Studio 2019 to build WinCairo port.

You can follow ​AppleWin port's instructions to install the necessary developer tools, and check out the WebKit code.

The easiest way to install some tools is using ​Chocolatey,

choco install cmake ActivePerl python2 ruby git svn patch diffutils gperf -y
pip install pywin32

Building on Windows

In the top source directory, use

perl Tools/Scripts/build-webkit --wincairo --release

to start the build. Ensure you don't have GCC in your PATH, otherwise CMake is going to use GCC and builds will fail.

If you are behind http proxy, set following environment variabls for libcurl.

set http_proxy=http://proxy.example.com:8080/
set https_proxy=%http_proxy%
set no_proxy=localhost,127.0.0.1

Building from within Visual Studio

perl WebKit/Tools/Scripts/build-webkit --wincairo --release --no-ninja --generate-project-only

Some environment variables should be propagated to Visual Studio.

set WEBKIT_LIBRARIES=%cd%\WebKitLibraries\win
set WEBKIT_OUTPUTDIR=%cd%\WebKitBuild
devenv WebKitBuild\Release\WebKit.sln

Required Libraries

You will get required libraries downloaded automatically when you perform a build-webkit --wincairo. The source code is hosted in: ​https://github.com/WebKitForWindows/WinCairoRequirements

Running the tests

XAMPP should be installed in the default install path (c:\xampp).

choco install Bitnami-XAMPP -y

If Apache service is running, stop it by using Services of Control Panel.

Extensions .pl and .cgi need to be registered as CGI. Modify the following commands along your Perl path, and run them as administrator.

reg add HKEY_CLASSES_ROOT\.pl\Shell\ExecCGI\Command /ve /d "C:\tools\perl\perl\bin\perl.exe -T"
reg add HKEY_CLASSES_ROOT\.cgi\Shell\ExecCGI\Command /ve /d "C:\tools\perl\perl\bin\perl.exe -T"

Open a command prompt as administrator because http tests need to run Apache service.

set WEBKIT_LIBRARIES=%cd%\WebKitLibraries\win
set WEBKIT_OUTPUTDIR=%cd%\WebKitBuild
set WEBKIT_TESTFONTS=%cd%\Tools\WebKitTestRunner\fonts
# for WebKit1
python Tools/Scripts/run-webkit-tests --release --wincairo -1
# for WebKit2
python Tools/Scripts/run-webkit-tests --release --wincairo

You can use Docker to run LayoutTests by mounting the host directory.

docker run -it --rm --cpu-count=8 --memory=16g -v %cd%:c:\repo -w c:\repo webkitdev/msbuild

If you are using Japanese Windows, some layout tests fails due to form control size differences. GetStockObject(DEFAULT_GUI_FONT) returns MS UI Gothic on it. Remove GUIFont.Facename of HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\GRE_Initialize.

Download build artifacts from Buildbot

• Go to ​Buildbot.
• Click "WinCairo 64-bit WKL Release (Build)".
• Click any "Build #" which is green.
• Click "stdio" of "transfer-to-s3" of "Steps and Logfiles"
• You can find "S3 URL" in the console log.
• Download the zip.
• Download the corresponding release of WinCairoRequirements. ​https://github.com/WebKitForWindows/WinCairoRequirements/releases

• Unpack them, copy all DLL of WinCairoRequirements to the directory of MiniBrowser.exe
• Install ​vc_redist.x64.exe of Microsoft Visual C++ Redistributable for Visual Studio 2019

Compile WinCairo with Clang

It's recommended to use Ninja with clang-cl. ​https://reviews.llvm.org/D52193 Install clang-cl 9 and Ninja.

choco install llvm ninja -y

Open Visual Studio Command Prompt, and invoke the following commands.

set CC=clang-cl
set CXX=clang-cl
perl Tools\Scripts\build-webkit --release --wincairo --ninja

clang-cl builds are experimental, see ​Bug 171618 for the current status.