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README.md

UIWidgets Engine

Introduction

This is the engine code of UIWidgets.

How to Build (Windows)

Build Skia

Install depot_tools

git clone 'https://chromium.googlesource.com/chromium/tools/depot_tools.git'

Add ${PWD}/depot_tools to PATH

Clone the skia Repo

git clone https://skia.googlesource.com/skia.git
cd skia
git checkout chrome/m85
python2 tools/git-sync-deps

Install LLVM

https://clang.llvm.org/get_started.html

Build skia

bin/gn gen out/Debug

Update out/Debug/args.gn with the following content:

clang_win = "C:\Program Files\LLVM"
win_vc = "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC"
cc = "clang"
cxx = "clang++"
is_debug = true
skia_use_angle = true
skia_use_egl = true
extra_cflags = [
  "/MTd",
  "-I../../third_party/externals/angle2/include",
]

ninja -C out/Debug -k 0

Ignore this error: "lld-link: error: could not open 'EGL': no such file or directory"

convert icudtl.dat to object file in skia

cd SkiaRoot/third_party/externals/icu/flutter/
ld -r -b binary -o icudtl.o icudtl.dat

Build flutter fml

Setting up the Engine development environment

Follow https://github.com/flutter/flutter/wiki/Setting-up-the-Engine-development-environment

Compiling for Windows

Follow https://github.com/flutter/flutter/wiki/Compiling-the-engine#compiling-for-windows

Checkout flutter-1.17-candidate.5

cd engine/src/flutter
git checkout flutter-1.17-candidate.5
gclient sync -D

Apply the following diff:

diff --git a/fml/BUILD.gn b/fml/BUILD.gn
index 9b5626e78..da1322ce5 100644
--- a/fml/BUILD.gn
+++ b/fml/BUILD.gn
@@ -295,3 +295,10 @@ executable("fml_benchmarks") {
     "//flutter/runtime:libdart",
   ]
 }
+
+static_library("fml_lib") {
+  complete_static_lib = true
+  deps = [
+    "//flutter/fml",
+  ]
+}

cmd

set GYP_MSVS_OVERRIDE_PATH=C:\Program Files (x86)\Microsoft Visual Studio\2017\Community
cd engine/src
python ./flutter/tools/gn --unoptimized
ninja -C .\out\host_debug_unopt\ flutter/fml:fml_lib

Create symbolic

cmd

cd <uiwidigets_dir>\engine
cd third_party   \\ create the directory if not exists
mklink /D skia <SKIA_ROOT>

Flutter engine txt include skia header in this pattern 'third_party/skia/*', so without symbolic, the txt lib will include skia header file in flutter engine, instead of headers in skia repo.

Build Engine

cd <uiwidigets_dir>\engine
bee

How to Build (Mac)

Install Depot_tools

git clone 'https://chromium.googlesource.com/chromium/tools/depot_tools.git'

export PATH="${PWD}/depot_tools:${PATH}"

Build Skia

git clone https://skia.googlesource.com/skia.git

git checkout chrome/m85

bin/gn gen out/Debug

python tools/git-sync-deps

ninja -C out/Debug -k 0

Please ensure that you are using python2 when executing "python tools/git-sync-deps".

Build Flutter Engine

Setting up the Engine development environment

Please follow https://github.com/flutter/flutter/wiki/Setting-up-the-Engine-development-environment.

Check out repo and update dependencies:

git checkout flutter-1.17-candidate.5
gclient sync -D

Apply changes to BUILD.gn (src/flutter/fml/BUILD.gn)

diff --git a/fml/BUILD.gn b/fml/BUILD.gn
index 9b5626e78..da1322ce5 100644
--- a/fml/BUILD.gn
+++ b/fml/BUILD.gn
@@ -295,3 +295,10 @@ executable("fml_benchmarks") {
     "//flutter/runtime:libdart",
   ]
 }
+
+static_library("fml_lib") {
+  complete_static_lib = true
+  deps = [
+    "//flutter/fml",
+  ]
+}

Comiple engine:

cd engine/src

./flutter/tools/gn --unoptimized

ninja -C ./out/host_debug_unopt/ flutter/fml:fml_lib

If the compilation fails because "no available Mac SDK is found" (in flutter-1.17 the build tool will only try to find Mac 10.XX SDKs), please modify the file "/src/build/Mac/find_sdk.py" under flutter root by setting "sdks" as your current sdk, e.g., ['11.0'].

Build Lib

set SKIA_ROOT and FLUTTER_ROOT to your $PATH. SKIA_ROOT is the root folder of your skia repository. FLUTTER_ROOT is the root folder of your flutter engine repository.

Create symbolic as follows. Flutter engine txt include skia header in this pattern 'third_party/skia/*', so without symbolic, the txt lib will include skia header file in flutter engine, instead of headers in skia repo.

cmd

cd <uiwidigets_dir>\engine
cd third_party   \\ create the directory if not exists
ln -s <SKIA_ROOT> skia

Build Engine

cd <uiwidigets_dir>\engine
mono bee.exe

build android sdk on mac

Build flutter fml + skia + txt

Setting up the Engine development environment

Follow https://github.com/flutter/flutter/wiki/Setting-up-the-Engine-development-environment

Checkout flutter-1.18-candidate.5

cd engine/src/flutter
git checkout flutter-1.18-candidate.5
gclient sync -D

Apply following to end of flutter/third_party/txt/BUILD.gn

diff --git a/third_party/txt/BUILD.gn b/third_party/txt/BUILD.gn
index 56b73a020..d42e88045 100644
--- a/third_party/txt/BUILD.gn
+++ b/third_party/txt/BUILD.gn
@@ -141,6 +141,7 @@ source_set("txt") {
     "//third_party/harfbuzz",
     "//third_party/icu",
     "//third_party/skia",
+    "//third_party/skia/modules/skottie",
+    "//third_party/libcxx",
+    "//third_party/libcxxabi",
   ]
 
   deps = [
@@ -339,3 +340,10 @@ executable("txt_benchmarks") {
     deps += [ "//third_party/skia/modules/skparagraph" ]
   }
 }
+
+static_library("txt_lib") {
+  complete_static_lib = true
+  deps = [
+    ":txt",
+  ]
+}

remove visibility = [ "../libcxx:*" ] from /build/secondary/third_party/libcxxabi/BUILD.gn

cmd

cd $FLUTTER_ROOT
python ./flutter/tools/gn --unoptimized --android
ninja -C out/android_debug_unopt/ flutter/third_party/txt:txt_lib
ninja -C out/android_debug_unopt/ third_party/libcxx
ninja -C out/android_debug_unopt/ third_party/libcxxabi

build icu

cd <uiwidigets_dir>\engine
python $FLUTTER_ROOT/flutter/sky/tools/objcopy.py --objcopy $FLUTTER_ROOT/third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-objcopy --input $FLUTTER_ROOT/third_party/icu/flutter/icudtl.dat --output icudtl.o --arch arm

build uiwidgets

cd <uiwidigets_dir>\engine
mono bee.exe