build.sh

#! /usr/bin/env bash
set -eo pipefail

# These two variables should be set in tandem to keep a consistent set of sources.
# Last set Sat Jun 15 11:00:00 PDT 2024
DEPOT_TOOLS_COMMIT=1d1f17af898bc5158fb1128952894ac061b06f56
SKIA_BRANCH=chrome/m127

for arg in "$@"; do
	case "$arg" in
	--args | -a) SHOW_ARGS=1 ;;
	--clean | -c) CLEAN=restore ;;
	--CLEAN | -C) CLEAN=full ;;
	--help | -h)
		echo "$0 [options]"
		echo "  -a, --args  Display the available args list for the skia build (no build)"
		echo "  -c, --clean Remove the dist and skia/build directories (no build)"
		echo "  -C, --CLEAN Remove the dist and skia directories (no build)"
		echo "  -h, --help This help text"
		exit 0
		;;
	*)
		echo "Invalid argument: $arg"
		exit 1
		;;
	esac
done

if [ "$CLEAN"x == "fullx" ]; then
	/bin/rm -rf dist skia
	exit 0
fi

if [ "$CLEAN"x == "restorex" ]; then
	/bin/rm -rf dist skia/build
	if [ -d skia/skia ]; then
		cd skia/skia
		git checkout -- .
		rm include/sk_capi.h src/sk_capi.cpp
	fi
	exit 0
fi

if [ "$SHOW_ARGS"x == "1x" ]; then
	export PATH="${PWD}/skia/depot_tools:${PATH}"
	cd skia/skia
	bin/gn args ../build --list --short
	exit 0
fi

BUILD_DIR=${PWD}/skia/build
DIST=${PWD}/dist

# As changes to Skia are made, these args may need to be adjusted.
# Use 'bin/gn args $BUILD_DIR --list' to see what args are available.
COMMON_ARGS=" \
  is_debug=false \
  is_official_build=true \
  skia_enable_discrete_gpu=true \
  skia_enable_fontmgr_android=false \
  skia_enable_fontmgr_empty=false \
  skia_enable_fontmgr_fuchsia=false \
  skia_enable_fontmgr_win_gdi=false \
  skia_enable_gpu=true \
  skia_enable_pdf=true \
  skia_enable_skottie=false \
  skia_enable_skshaper=true \
  skia_enable_skshaper_tests=false \
  skia_enable_spirv_validation=false \
  skia_enable_tools=false \
  skia_enable_vulkan_debug_layers=false \
  skia_use_angle=false \
  skia_use_dawn=false \
  skia_use_dng_sdk=false \
  skia_use_egl=false \
  skia_use_expat=false \
  skia_use_ffmpeg=false \
  skia_use_fixed_gamma_text=false \
  skia_use_fontconfig=false \
  skia_use_gl=true \
  skia_use_harfbuzz=false \
  skia_use_icu=false \
  skia_use_libheif=false \
  skia_use_libjxl_decode=false \
  skia_use_lua=false \
  skia_use_metal=false \
  skia_use_piex=false \
  skia_use_system_libjpeg_turbo=false \
  skia_use_system_libpng=false \
  skia_use_system_libwebp=false \
  skia_use_system_zlib=false \
  skia_use_vulkan=false \
  skia_use_wuffs=true \
  skia_use_xps=false \
  skia_use_zlib=true \
"

case $(uname -s) in
Darwin*)
	OS_TYPE=darwin
	LIB_NAME=libskia.a
	case $(uname -m) in
	x86_64*)
		UNISON_LIB_NAME=libskia_darwin_amd64.a
		export MACOSX_DEPLOYMENT_TARGET=10.15
		;;
	arm*)
		UNISON_LIB_NAME=libskia_darwin_arm64.a
		export MACOSX_DEPLOYMENT_TARGET=11
		;;
	esac
	PLATFORM_ARGS=" \
      skia_enable_fontmgr_win=false \
      skia_use_fonthost_mac=true \
      skia_enable_fontmgr_fontconfig=false \
      skia_use_fontconfig=false \
      skia_use_freetype=false \
      skia_use_x11=false \
      extra_cflags=[ \
        \"-Wno-unused-command-line-argument\" \
      ] \
      extra_cflags_cc=[ \
        \"-DHAVE_XLOCALE_H\" \
      ] \
      extra_cflags_c=[ \
        \"-DHAVE_ARC4RANDOM_BUF\", \
        \"-stdlib=libc++\" \
      ] \
    "
	;;
Linux*)
	OS_TYPE=linux
	LIB_NAME=libskia.a
	UNISON_LIB_NAME=libskia_linux.a
	PLATFORM_ARGS=" \
      skia_enable_fontmgr_win=false \
      skia_use_fonthost_mac=false \
      skia_enable_fontmgr_fontconfig=true \
      skia_use_fontconfig=true \
      skia_use_freetype=true \
      skia_use_x11=true \
      extra_cflags=[ \
        \"-Wno-psabi\" \
      ] \
      extra_cflags_cc=[ \
        \"-DHAVE_XLOCALE_H\" \
      ] \
      extra_cflags_c=[ \
        \"-DHAVE_ARC4RANDOM_BUF\", \
      ] \
    "
	;;
MINGW*)
	OS_TYPE=windows
	LIB_NAME=skia.dll
	UNISON_LIB_NAME=skia_windows.dll
	PLATFORM_ARGS=" \
      is_component_build=true \
      skia_enable_fontmgr_win=true \
      skia_use_fonthost_mac=false \
      skia_enable_fontmgr_fontconfig=false \
      skia_use_fontconfig=false \
      skia_use_freetype=false \
      skia_use_x11=false \
      clang_win=\"C:\\Program Files\\LLVM\" \
      extra_cflags=[ \
        \"-DSKIA_C_DLL\", \
        \"-UHAVE_NEWLOCALE\", \
        \"-UHAVE_XLOCALE_H\", \
        \"-UHAVE_UNISTD_H\", \
        \"-UHAVE_SYS_MMAN_H\", \
        \"-UHAVE_MMAP\", \
        \"-UHAVE_PTHREAD\" \
      ] \
      extra_ldflags=[ \
        \"/defaultlib:opengl32\", \
        \"/defaultlib:gdi32\" \
      ] \
    "
	;;
*)
	echo "Unsupported OS"
	false
	;;
esac

# Setup the Skia tree, pulling sources, if needed.
mkdir -p skia
cd skia

if [ ! -e depot_tools ]; then
	git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
	cd depot_tools
	git reset --hard "${DEPOT_TOOLS_COMMIT}"
	cd ..
fi
export PATH="${PWD}/depot_tools:${PATH}"

if [ ! -e skia ]; then
	git clone https://github.com/google/skia.git
	cd skia
	git checkout "${SKIA_BRANCH}"
	python3 tools/git-sync-deps
	python3 bin/fetch-ninja
	cd ..
fi

# Apply our changes.
cd skia
/bin/rm -rf src/c include/c
cp ../../capi/sk_capi.h include/
cp ../../capi/sk_capi.cpp src/
grep -v src/sk_capi.cpp gn/core.gni | sed -e 's@skia_core_sources = \[@&\
  "$_src/sk_capi.cpp",@' >gn/core.gni.new
/bin/mv gn/core.gni.new gn/core.gni
sed -e 's@^class SkData;$@#include "include/core/SkData.h"@' src/pdf/SkPDFSubsetFont.h >src/pdf/SkPDFSubsetFont.h.new
/bin/mv src/pdf/SkPDFSubsetFont.h.new src/pdf/SkPDFSubsetFont.h

# Perform the build
bin/gn gen "${BUILD_DIR}" --args="${COMMON_ARGS} ${PLATFORM_ARGS}"
ninja -C "${BUILD_DIR}"

# Copy the result into ${DIST}
mkdir -p "${DIST}/include"
/bin/rm -f ${DIST}/include/*.h
cp include/sk_capi.h "${DIST}/include/"
mkdir -p "${DIST}/lib/${OS_TYPE}"
cp "${BUILD_DIR}/${LIB_NAME}" "${DIST}/lib/${OS_TYPE}/"

cd ../..

# If present, also copy the results into the unison build tree
if [ -d ../unison ]; then
	RELATIVE_UNISON_DIR=../unison/internal/skia
	mkdir -p "${RELATIVE_UNISON_DIR}"
	cp "${DIST}/include/sk_capi.h" "${RELATIVE_UNISON_DIR}/"
	cp "${DIST}/lib/${OS_TYPE}/${LIB_NAME}" "${RELATIVE_UNISON_DIR}/${UNISON_LIB_NAME}"
	echo "Copied distribution to unison"
fi