PNG to FastLED bitmap array

command.sh

SERPENTINE=1 pipenv run python img2c.py ~/Desktop/star.png > src/bitmap.h
# star.png is a 16x16 PNG file

img2c.py

import sys
import os

from PIL import Image

im = Image.open(sys.argv[1])

# pass SERPENTINE=1 in env to get the matrix to "zigzag" where rows are connected at the ends
serpentine = os.environ.get("SERPENTINE") == "1"

pixels = list(im.getdata())

if serpentine:
    w = im.width
    h = im.height
    for row in range(1, h, 2):
        pixels[row * w : (row * w) + w] = pixels[
            ((row * w) + w) - 1 : (row * w) - 1 : -1
        ]

print("#include <FastLED.h>")
print(f"CRGB bitmap[{len(pixels)}] = {'{'}")
for i, c in enumerate(pixels):
    print(f"  CRGB({c[0]}, {c[1]}, {c[2]}){',' if i < len(pixels) - 1 else ''}")
print("};")

main.cpp

#include <FastLED.h>
#include "bitmap.h"

#define NUM_LEDS  256
#define LED_PIN   25

CRGB leds[NUM_LEDS];

void setup() {

  FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setBrightness(7);

  Serial.begin(57600);

  FastLED.clear(true);
}

void loop() {

  EVERY_N_MILLISECONDS(100) {
    memcpy(&leds[0], &bitmap[0], NUM_LEDS * sizeof(CRGB));
    FastLED.show();
  }

}