add script to generate sprites for briar

generate-for-briar.sh

+#!/bin/bash
+
+BASE_DIR="noto-emoji/build"
+IMAGE_DIR="${BASE_DIR}/briar"
+
+if [ ! -d "$IMAGE_DIR" ]; then
+	./noto-emoji/materialize_emoji_images.py -s ${BASE_DIR}/compressed_pngs/ -d ${IMAGE_DIR}
+	for file in ${IMAGE_DIR}/*
+	do
+		echo "Resizing ${file}..."
+		convert ${file} -resize 64x60 -gravity center -background transparent -extent 64x64 ${file}
+	done
+else
+	echo "Directory ${IMAGE_DIR} does already exist."
+fi
+
+echo "Generating sprites..."
+./spritegen --emoji-width=64 --emoji-height=64 --emoji-pad-x=0 --emoji-pad-y=0 --emoji="${IMAGE_DIR}"