pixfect.sh

#!/usr/bin/env bash

# Pixfect - Pixel perfect image/video to pixel-art converter

# Basic configuration

image_size="128"
image_colors="10"
image_filters=""
image_video="false"
image_fps="10"

# Define a function to print the help message
help() {
    echo "Usage: $0 [options] <input> <output>"
    echo "Pixfect - Tool for dithering and converting images/videos to pixel art"
    echo ""
    echo "Options:"
    echo "  -s, --size          Resolution of image for manipulation (default: 128)"
    echo "  -c, --colors        Amount of colors used in image (default: 10)"
    echo "  -f, --filters       Specify Additional ImageMagick filters"
    echo "  -v, --video         Convert video (experimental)"
    echo "  -p, --fps           Frames per second for video (default: 10)"
    echo "  -h, --help          Display help message"
}

# Parse arguments
while [[ $# -gt 0 ]]; do
    key="$1"
    case $key in
        -s|--size)
        image_size="$2"
        shift
        shift
        ;;
        -c|--colors)
        image_colors="$2"
        shift
        shift
        ;;
        -v|--video)
        image_video="true"
        shift
        ;;
        -p|--fps)
        image_fps="$2"
        shift
        shift
        ;;
        -f|--filters)
        image_filters="$2"
        shift
        shift
        ;;
        -h|--help)
        help
        exit 0
        ;;
        *)
        break
        ;;
    esac
done

input_file="$1"
output_file="$2"

# Check if input file is specified
if [[ -z "$input_file" ]]; then
    echo "Error: input file not specified"
    exit 1
fi

# Check if input file exists
if [[ ! -f "$input_file" ]]; then
    echo "Error: input file does not exist"
    exit 1
fi

# Use fallback if output file not specified
if [[ "$image_video" == "false" ]]; then
    if [[ -z "$output_file" ]]; then
        output_file="${input_file%.*}-pixfect.png"
    fi
fi

if [[ "$image_video" == "true" ]]; then
    if [[ -z "$output_file" ]]; then
        output_file="${input_file%.*}-pixfect.gif"
    fi
fi

# Fancy spinner
spinner() {
    local pid=$1
    local delay=0.1
    local spinstr='|/-\'
    while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
        local temp=${spinstr#?}
        printf "[%c] Converting..." "$spinstr"
        spinstr=$temp${spinstr%"$temp"}
        sleep $delay
        printf "\r"
    done
    printf "      \r"
}

# Image conversion
convert_file() {
	convert "$input_file" -resize "$image_size" \
	$image_filters -ordered-dither o8x8,"$image_colors" \
	"$output_file"
}

# Video conversion
if [[ "$image_video" == "true" ]]; then
    convert_file() {
    	rm -rf /tmp/pixfect_temp
        mkdir /tmp/pixfect_temp /tmp/pixfect_temp/frames

        ffmpeg -hide_banner -loglevel error -i $input_file -vf "fps=$image_fps,scale=$image_size:-1" /tmp/pixfect_temp/frames/frame-%03d.png
        ffmpeg -hide_banner -loglevel error -i /tmp/pixfect_temp/frames/frame-%03d.png -vf "palettegen=max_colors=$((image_colors + 1))" /tmp/pixfect_temp/palette.png
        ffmpeg -hide_banner -loglevel error -y -i /tmp/pixfect_temp/frames/frame-%03d.png -i /tmp/pixfect_temp/palette.png -filter_complex "fps=$image_fps, paletteuse=dither=bayer" $output_file
    }
fi

# Start spinner animation
convert_file &
spinner $!

echo -e "\033[2K\r\033[32m✔ Done\033[0m"

# Get the sizes of the input and output files
input_size=$(wc -c < "$input_file")
output_size=$(wc -c < "$output_file")

# Calculate the difference in size and percentage difference
# diff=$(echo "scale=2; $output_size - $input_size" | bc)
# perc_diff=$(echo "scale=2; ($output_size / $input_size - 1) * 100" | bc)

# Determine the unit to use (MB or KB)
if [ $output_size -gt 1048576 ]; then
  unit="MB"
  output_size=$(echo "scale=2; $output_size / 1048576" | bc)
  input_size=$(echo "scale=2; $input_size / 1048576" | bc)
else
  unit="KB"
  output_size=$(echo "scale=2; $output_size / 1024" | bc)
  input_size=$(echo "scale=2; $input_size / 1024" | bc)
fi

# Print the results with fancy graphics
printf "%-15s %-15s\n" "Input Size:"	"$input_size $unit"
printf "%-15s %-15s\n" "Output Size:"	"$output_size $unit"
# printf "%-15s %-15s\n" "Difference:"	"$diff $unit"
# printf "%-15s %-15s\n" "Perc Diff:"	"$perc_diff%"

# if [ $diff -gt 0 ]; then
#   echo -e "\xE2\x86\x91" # up arrow
# elif [ $diff -lt 0 ]; then
#   echo -e "\xE2\x86\x93" # down arrow
# else
#   echo "="
# fi