hatokurandom-ogp.sh

font=~/Library/Fonts/MyFavoriteFont.ttf
icon=apple-touch-icon.png

convert \
  -background transparent \
  -size 980x640 \
  \( \
    -background transparent -fill white \
    -font "$font" \
    -gravity center \
    'label:Hatokurandom' \
  \) \
  ,text.png

convert ,text.png -alpha extract ,mask.png

convert \
  ,mask.png \
  -fill black -draw "polygon 641,0 381,640 980,640 980,0" \
  ,mask-for-left.png

convert \
  ,mask.png \
  -fill black -draw "polygon 0,0 640,0 380,640 0,640" \
  -fill black -draw "polygon 537,0 537,640 980,640 980,0" \
  ,mask-for-center.png

convert \
  ,mask.png \
  -fill black -draw "polygon 0,0 537,0 537,640 0,640" \
  ,mask-for-right.png

convert ,text.png ,mask-for-left.png \
        -alpha off -compose CopyOpacity -composite \
        ,text-left.png

convert ,text.png ,mask-for-center.png \
        -alpha off -compose CopyOpacity -composite \
        ,text-center.png

convert ,text.png ,mask-for-right.png \
        -alpha off -compose CopyOpacity -composite \
        ,text-right.png

convert \
  -background transparent \
  \( ,text-left.png -gravity center -extent 980x640-0+0 \) \
  \( ,text-center.png -gravity center -extent 980x640+0-8 \) \
  -composite \
  \( ,text-right.png -gravity center -extent 980x640+0-0 \) \
  -composite ,text-glitched.png

convert \
  -background transparent \
  \( "$icon" -gravity center -resize '1280x640^' -extent 1280x640 -blur 0x20 -fill black -colorize 25% \) \
  \( ,text-glitched.png -gravity east -extent 1280x640-80+0 \) \
  -composite \
  \( "$icon" -gravity west -extent "1280x640-80+0" \) \
  -composite ,ogp.jpg