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Tweak ebook deploy script to more reliably generate cover image thumbnails

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This commit is contained in:
Alex Cabal 2023-04-23 19:56:58 -05:00
parent 03d7206f93
commit 689cd1c5c1
1 changed files with 9 additions and 4 deletions
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13
scripts/deploy-ebook-to-www
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@ -1,4 +1,5 @@
#!/bin/bash
set -e
usage(){
fmt <<EOF
@ -243,9 +244,13 @@ do
sed -i "s/cover\.jpg/${urlSafeIdentifier}\.jpg/g" "${imgWorkDir}/${urlSafeIdentifier}.svg"
# Resize and compress the image (formula from Google Page Speed Insights)
convert -resize "242" -sampling-factor 4:2:0 -strip -quality 80 -colorspace RGB -interlace JPEG "${imgWorkDir}/${urlSafeIdentifier}.svg" "${imgWorkDir}/${urlSafeIdentifier}-cover.jpg"
convert -resize "484" -sampling-factor 4:2:0 -strip -quality 80 -colorspace RGB -interlace JPEG "${imgWorkDir}/${urlSafeIdentifier}.svg" "${imgWorkDir}/${urlSafeIdentifier}-cover@2x.jpg"
# Resize and compress the cover image (formula from Google Page Speed Insights)
# We can't use `convert` directly to do svg -> jpg, as sometimes it fails to load the linked cover.jpg within cover.svg.
# So, we use `rsvg-convert` to write a png, then `convert` to convert and compress to jpg.
rsvg-convert --width 242 --keep-aspect-ratio --output "${imgWorkDir}/${urlSafeIdentifier}.png" "${imgWorkDir}/${urlSafeIdentifier}.svg"
rsvg-convert --width 484 --keep-aspect-ratio --output "${imgWorkDir}/${urlSafeIdentifier}@2x.png" "${imgWorkDir}/${urlSafeIdentifier}.svg"
convert -sampling-factor 4:2:0 -strip -quality 80 -colorspace RGB -interlace JPEG "${imgWorkDir}/${urlSafeIdentifier}.png" "${imgWorkDir}/${urlSafeIdentifier}-cover.jpg"
convert -sampling-factor 4:2:0 -strip -quality 80 -colorspace RGB -interlace JPEG "${imgWorkDir}/${urlSafeIdentifier}@2x.png" "${imgWorkDir}/${urlSafeIdentifier}-cover@2x.jpg"
"${scriptsDir}"/cavif --quiet --quality 50 "${imgWorkDir}/${urlSafeIdentifier}-cover.jpg" -o "${imgWorkDir}/${urlSafeIdentifier}-cover.avif"
"${scriptsDir}"/cavif --quiet --quality 50 "${imgWorkDir}/${urlSafeIdentifier}-cover@2x.jpg" -o "${imgWorkDir}/${urlSafeIdentifier}-cover@2x.avif"
@ -254,7 +259,7 @@ do
sudo chmod --preserve-root --recursive g+w "${imgWorkDir}/${urlSafeIdentifier}"*
# Remove unused images so we can copy the rest over with a glob
rm "${imgWorkDir}/${urlSafeIdentifier}".{jpg,svg}
rm "${imgWorkDir}/${urlSafeIdentifier}".{png,jpg,svg}
if [ "${verbose}" = "true" ]; then
printf "Done.\n"