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create_photo_derivatives() {
local -r photos_dir="$1"; shift
local -r thumbs_dir="$1"; shift
local -r blurs_dir="$1"; shift
local -r photo="$1"; shift
local dirname
local height
if [[ -f "$DIST_DIR/$thumbs_dir/$photo" \
&& -f "$DIST_DIR/$blurs_dir/$photo" ]]; then
log_verbose "Skipped existing thumb and blur" \
"$(_display_path "$DIST_DIR/$thumbs_dir/$photo") and" \
"$(_display_path "$DIST_DIR/$blurs_dir/$photo")"
return
fi
dirname="$DIST_DIR/$thumbs_dir"
mkdir -p "$dirname"
log_info "Creating thumb $(_display_path "$DIST_DIR/$thumbs_dir/$photo")"
# Double the height, as CSS scales images based on boxing too.
height=$(( THUMBHEIGHT * 2 ))
imagemagick \
"$DIST_DIR/$photos_dir/$photo" \
-geometry "x$height" \
"$DIST_DIR/$thumbs_dir/$photo"
dirname="$DIST_DIR/$blurs_dir"
mkdir -p "$dirname"
log_info "Creating blur $(_display_path "$DIST_DIR/$blurs_dir/$photo")"
imagemagick \
"$DIST_DIR/$thumbs_dir/$photo" \
-flip \
-blur 0x8 \
"$DIST_DIR/$blurs_dir/$photo"
}
create_all_photo_derivatives() {
local -r photos_dir="$1"; shift
local -r thumbs_dir="$1"; shift
local -r blurs_dir="$1"; shift
local -i failed=0
local -a image_job_pids=()
# Passed by name to wait_for_image_job_slot and wait_for_image_jobs.
# shellcheck disable=SC2034
local -A image_job_labels=()
# Passed by name to wait_for_image_job_slot and wait_for_image_jobs.
# shellcheck disable=SC2034
local -A image_job_statuses=()
local photo
while IFS= read -r photo; do
wait_for_image_job_slot \
image_job_pids \
image_job_statuses \
image_job_labels \
failed
create_photo_derivatives "$photos_dir" "$thumbs_dir" "$blurs_dir" \
"$photo" &
image_job_pids+=("$!")
# Read through a nameref in the job-pool helpers.
# shellcheck disable=SC2034
image_job_labels["$!"]="image derivative job for photo $photo"
done < <(
find "$DIST_DIR/$photos_dir" -maxdepth 1 -type f -printf '%f\n' \
| sort
)
wait_for_image_jobs \
image_job_pids \
image_job_statuses \
image_job_labels \
failed
if (( failed != 0 )); then
return 1
fi
}
prepare_generation_photo_assets() {
warn_unsupported_incoming_files
mkdir -p "$DIST_DIR/photos"
cleanphotos
scalephotos
create_all_photo_derivatives 'photos' 'thumbs' 'blurs'
}
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