Add freetype2 build script

wasm/build-scripts/build-ffmpeg.sh

@@ -9,7 +9,7 @@ FLAGS=(
   -I. -I./fftools -I$BUILD_DIR/include
   -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -L$BUILD_DIR/lib
   -Wno-deprecated-declarations -Wno-pointer-sign -Wno-implicit-int-float-conversion -Wno-switch -Wno-parentheses -Qunused-arguments
-  -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -lpostproc -lm -lx264 -lx265 -lvpx -lwavpack -lmp3lame -lfdk-aac -lvorbis -lvorbisenc -lvorbisfile -logg -ltheora -ltheoraenc -ltheoradec -lz -pthread
+  -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -lpostproc -lm -lx264 -lx265 -lvpx -lwavpack -lmp3lame -lfdk-aac -lvorbis -lvorbisenc -lvorbisfile -logg -ltheora -ltheoraenc -ltheoradec -lz -lfreetype -pthread
   fftools/ffmpeg_opt.c fftools/ffmpeg_filter.c fftools/ffmpeg_hw.c fftools/cmdutils.c fftools/ffmpeg.c
   -o wasm/dist/ffmpeg-core.js
   -s USE_SDL=2                                  # use SDL2

wasm/build-scripts/build-freetype2.sh

+#!/bin/bash
+
+set -euo pipefail
+source $(dirname $0)/var.sh
+
+LIB_PATH=third_party/freetype2
+CFLAGS="-s USE_PTHREADS=1 $OPTIM_FLAGS"
+CONF_FLAGS=(
+  --prefix=$BUILD_DIR                                 # install library in a build directory for FFmpeg to include
+  --host=i686-gnu                                     # use i686 linux
+  --enable-shared=no                                  # not to build shared library
+)
+echo "CONF_FLAGS=${CONF_FLAGS[@]}"
+(cd $LIB_PATH && \
+  emconfigure ./autogen.sh && \
+  CFLAGS=$CFLAGS emconfigure ./configure "${CONF_FLAGS[@]}")
+emmake make -C $LIB_PATH clean
+emmake make -C $LIB_PATH install -j

wasm/build-scripts/configure-ffmpeg.sh

@@ -16,6 +16,7 @@ FLAGS=(
   --enable-libfdk-aac     # enable libfdk-aac
   --enable-libtheora      # enable libtheora
   --enable-libvorbis      # enable libvorbis
+  --enable-libfreetype    # enable freetype
   # --enable-libaom         # enable libaom
 )
 echo "FFMPEG_CONFIG_FLAGS=${FLAGS[@]}"