scripts/activate-linux at master · JCoMcL/scripts · GitHub

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#!/usr/bin/env bash

# Get the height of the input image
height=$(magick identify -format "%h" "$1")

# Calculate 10% of the height
watermark_height=$(( height / 15 ))

svg_height=25
watermark_svg() {
cat << EOF
<svg viewBox="0 0 88 ${svg_height}" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="s">
      <feOffset dx="1" dy="1"/>
      <feGaussianBlur stdDeviation="1"/>
      <feColorMatrix values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .70 0"/>
      <feMerge>
        <feMergeNode/>
        <feMergeNode in="SourceGraphic"/>
      </feMerge>
    </filter>
  </defs>
  <g filter="url(#s)" fill="#fff" fill-opacity=".36" font-family="sans-serif" transform="translate(2.4 3.5)">
    <text y="0" font-size="7" dominant-baseline="hanging">Activate Linux</text>
    <text y="8" font-size="5" dominant-baseline="hanging">Go to Settings to activate Linux.</text>
  </g>
</svg>
EOF
}

density=$(( (watermark_height * 72) / svg_height ))
outfile=`mktemp`

magick "$1" \
  '(' -background none -density ${density} <(watermark_svg) -resize x${watermark_height} ')' \
  -gravity southeast \
  -geometry +20+100 \
  -composite \
  $outfile

echo $outfile