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Fix Chromium emoji rendering #710

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Merged
guysoft merged 1 commit into from
Jun 23, 2026
Merged

Fix Chromium emoji rendering #710

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35 changes: 33 additions & 2 deletions src/modules/fullpageos/start_chroot_script
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Original file line number Diff line number Diff line change
Expand Up @@ -108,8 +108,39 @@ then
fi

# Add emoji support
sudo -u pi mkdir -p /home/pi/.fonts
sudo -u pi wget --directory-prefix /home/pi/.fonts https://github.com/googlefonts/noto-emoji/raw/main/fonts/NotoColorEmoji.ttf
apt-get install -y fonts-noto-color-emoji fontconfig
mkdir -p /etc/fonts/conf.d
cat > /etc/fonts/conf.d/99-fullpageos-emoji.conf <<'EOF'
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
<fontconfig>
<match target="pattern">
<test qual="any" name="family">
<string>sans-serif</string>
</test>
<edit name="family" mode="prepend" binding="strong">
<string>Noto Color Emoji</string>
</edit>
</match>
<match target="pattern">
<test qual="any" name="family">
<string>serif</string>
</test>
<edit name="family" mode="prepend" binding="strong">
<string>Noto Color Emoji</string>
</edit>
</match>
<match target="pattern">
<test qual="any" name="family">
<string>monospace</string>
</test>
<edit name="family" mode="prepend" binding="strong">
<string>Noto Color Emoji</string>
</edit>
</match>
</fontconfig>
EOF
fc-cache -f

#override password
if [ "$FULLPAGEOS_OVERRIDE_PASSWORD" != "default" ]
Expand Down
112 changes: 112 additions & 0 deletions testing/tests/test_emoji.sh
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Original file line number Diff line number Diff line change
@@ -0,0 +1,112 @@
#!/bin/bash
set -e

export E2E_SSH_HOST="${1:-localhost}"
export E2E_SSH_PORT="${2:-2222}"
ARTIFACTS_DIR="${3:-}"
source /test/scripts/ssh-helpers.sh

TMP_DIR=$(mktemp -d)
trap 'rm -rf "$TMP_DIR"' EXIT

HTML_FILE="$TMP_DIR/emoji-cloud.html"
SCREENSHOT_FILE="$TMP_DIR/emoji-cloud.png"
COUNTS_FILE="$TMP_DIR/emoji-cloud-pixel-counts.txt"

cat > "$HTML_FILE" <<'HTML'
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
html,
body {
width: 400px;
height: 240px;
margin: 0;
background: #101828;
}

body {
display: flex;
align-items: center;
justify-content: center;
}

.emoji {
color: #ffffff;
font-family: sans-serif;
font-size: 144px;
line-height: 1;
}
</style>
</head>
<body>
<div class="emoji" aria-label="cloud emoji">&#x2601;&#xFE0F;</div>
</body>
</html>
HTML

echo "Test: Chromium renders the cloud emoji in color"

echo " Checking Noto Color Emoji font availability..."
FONT_MATCH=$(ssh_cmd "fc-match 'Noto Color Emoji' || true" 2>/dev/null)
if ! echo "$FONT_MATCH" | grep -qi "NotoColorEmoji\|Noto Color Emoji"; then
echo " FAIL: Noto Color Emoji is not available to fontconfig"
echo " fc-match output: $FONT_MATCH"
exit 1
fi

echo " Rendering emoji fixture with Chromium headless..."
scp_cmd "$HTML_FILE" "pi@${E2E_SSH_HOST}:/tmp/emoji-cloud.html" >/dev/null
ssh_cmd "rm -rf /tmp/emoji-chromium-profile /tmp/emoji-cloud.png && sudo -u pi env HOME=/home/pi chromium --headless --disable-gpu --no-sandbox --disable-dev-shm-usage --hide-scrollbars --run-all-compositor-stages-before-draw --virtual-time-budget=1000 --user-data-dir=/tmp/emoji-chromium-profile --screenshot=/tmp/emoji-cloud.png --window-size=400,240 file:///tmp/emoji-cloud.html" >/dev/null
scp_cmd "pi@${E2E_SSH_HOST}:/tmp/emoji-cloud.png" "$SCREENSHOT_FILE" >/dev/null

if [ -n "$ARTIFACTS_DIR" ]; then
mkdir -p "$ARTIFACTS_DIR"
cp "$HTML_FILE" "$ARTIFACTS_DIR/emoji-cloud.html"
cp "$SCREENSHOT_FILE" "$ARTIFACTS_DIR/emoji-cloud.png"
fi

read -r NON_BACKGROUND_PIXELS CHROMATIC_PIXELS < <(
convert "$SCREENSHOT_FILE" -alpha off -depth 8 txt:- | awk -F'[(),]' '
NR > 1 {
r = $3 + 0
g = $4 + 0
b = $5 + 0

dr = r - 16; if (dr < 0) dr = -dr
dg = g - 24; if (dg < 0) dg = -dg
db = b - 40; if (db < 0) db = -db

max = r; if (g > max) max = g; if (b > max) max = b
min = r; if (g < min) min = g; if (b < min) min = b

if (dr > 8 || dg > 8 || db > 8) {
non_background++
if (max - min >= 25) {
chromatic++
}
}
}
END {
print non_background + 0, chromatic + 0
}'
)

echo "non_background_pixels=$NON_BACKGROUND_PIXELS chromatic_pixels=$CHROMATIC_PIXELS" > "$COUNTS_FILE"
if [ -n "$ARTIFACTS_DIR" ]; then
cp "$COUNTS_FILE" "$ARTIFACTS_DIR/emoji-cloud-pixel-counts.txt"
fi

if [ "$NON_BACKGROUND_PIXELS" -lt 1500 ]; then
echo " FAIL: Cloud emoji was not visibly rendered (non-background pixels: $NON_BACKGROUND_PIXELS)"
exit 1
fi

if [ "$CHROMATIC_PIXELS" -lt 50 ]; then
echo " FAIL: Cloud emoji rendered without enough color pixels (chromatic pixels: $CHROMATIC_PIXELS)"
exit 1
fi

echo " PASS: Cloud emoji rendered visibly in color"
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