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import os
import shutil
import subprocess
from io import BytesIO
from tempfile import NamedTemporaryFile
from PIL import Image, ImageOps
from config import IMAGE_STRIP_HEIGHT, IMAGE_QUALITY, IMAGE_CACHE, IMAGE_MAX_WIDTH, THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT, \
THUMBNAIL_QUALITY
Image.MAX_IMAGE_PIXELS = 1000000000
from glob import glob
def _copy(src, dst):
try:
os.link(src, dst)
except:
shutil.copy(src, dst)
def rechunk(im):
height = im.height
width = im.width
last_chunk = (height // IMAGE_STRIP_HEIGHT) - 1
for i, cursor in enumerate(range(0, height, IMAGE_STRIP_HEIGHT)):
if i == last_chunk:
chunk_height = IMAGE_STRIP_HEIGHT + (height % IMAGE_STRIP_HEIGHT)
else:
chunk_height = min(IMAGE_STRIP_HEIGHT, height)
yield im.crop((0, cursor, width, cursor + chunk_height))
if i == last_chunk:
break
def webp_convert(input_file, output_file, quality=IMAGE_QUALITY):
subprocess.run([
"ffmpeg", "-y", "-loglevel", "error", "-hide_banner", "-nostats", "-i", input_file,
"-c:v", "libwebp", "-preset", "drawing", "-quality", str(quality), "-compression_level", "6",
output_file
], text=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, check=True)
def copy_from_cache(cache_folder, output_folder):
for filename in glob(os.path.join(cache_folder, "*.webp")):
_copy(filename, os.path.join(output_folder, os.path.basename(filename)))
def is_cached(cache_folder):
if os.path.exists(os.path.join(cache_folder, "ok")):
return True
return False
def convert_cover(cache_key, filename, output_folder):
cache_folder = os.path.join(IMAGE_CACHE, cache_key)
os.makedirs(output_folder, exist_ok=True)
output_filename = os.path.join(output_folder, "cover.webp")
if os.path.exists(output_filename):
os.remove(output_filename)
if is_cached(cache_folder):
copy_from_cache(cache_folder, output_folder)
return
shutil.rmtree(cache_folder, ignore_errors=True)
os.makedirs(cache_folder)
im = open_image(filename)
if im.width > IMAGE_MAX_WIDTH:
aspect_ratio = im.height / im.width
new_height = int(IMAGE_MAX_WIDTH * aspect_ratio)
im = im.resize((IMAGE_MAX_WIDTH, new_height), resample=Image.Resampling.LANCZOS)
if im.mode != "RGB":
im = im.convert("RGB")
try:
with NamedTemporaryFile(delete=False, suffix=".png") as f:
im.save(f)
webp_convert(f.name, os.path.join(cache_folder, f"cover.webp"), quality=90)
finally:
os.remove(f.name)
with open(os.path.join(cache_folder, "ok"), "w"):
pass
copy_from_cache(cache_folder, output_folder)
def convert_rgb(im):
if im.mode == "RGBA":
background = Image.new('RGBA', im.size, color=(0, 0, 0))
alpha_composite = Image.alpha_composite(background, im)
im = alpha_composite.convert("RGB")
if im.mode != "RGB":
im = im.convert("RGB")
return im
def convert_rgba(im):
if im.mode != "RGBA":
im = im.convert("RGBA")
return im
def convert_chapter(cache_key, images, output_folder):
# TODO: for non-long strips, stack horizontally
# Limit height to
cache_folder = os.path.join(IMAGE_CACHE, cache_key)
shutil.rmtree(output_folder, ignore_errors=True)
os.makedirs(output_folder)
if is_cached(cache_folder):
copy_from_cache(cache_folder, output_folder)
return
shutil.rmtree(cache_folder, ignore_errors=True)
os.makedirs(cache_folder)
resized = []
# Resize images
for filename in images:
im = open_image(filename)
im = convert_rgb(im)
if im.width > IMAGE_MAX_WIDTH:
aspect_ratio = im.height / im.width
new_height = int(IMAGE_MAX_WIDTH * aspect_ratio)
if new_height == 0:
continue
im = im.resize((IMAGE_MAX_WIDTH, new_height), resample=Image.Resampling.LANCZOS)
resized.append(im)
# Prepare canvases
canvases = [
[resized[0]]
]
current_canvas = canvases[0]
last_image_width = resized[0].width
for i in range(1, len(resized)):
if last_image_width != resized[i].width:
canvases.append([])
current_canvas = canvases[-1]
current_canvas.append(resized[i])
last_image_width = resized[i].width
# Stack
stacked_images = []
for canvas in canvases:
width = canvas[0].width
height = sum(im.height for im in canvas)
new_image = Image.new("RGB", (width, height), color=(0, 0, 0, 0))
cursor = 0
for img in canvas:
new_image.paste(img, (0, cursor))
cursor += img.height
stacked_images.append(new_image)
# Rechunk
chunks = []
for im in stacked_images:
for im_chunk in rechunk(im):
chunks.append(im_chunk)
# Convert
for i, chunk in enumerate(chunks):
try:
with NamedTemporaryFile(delete=False, suffix=".png") as f:
chunk.save(f)
webp_convert(f.name, os.path.join(cache_folder, f"{i:03d}.webp"))
finally:
os.remove(f.name)
with open(os.path.join(cache_folder, "ok"), "w"):
pass
copy_from_cache(cache_folder, output_folder)
def open_image(filename):
with open(filename, "rb") as f:
data = f.read()
io = BytesIO(data)
io.name = filename
return Image.open(io)
def create_thumbnail_sheet(images, output_filename):
images = [open_image(image["cover"]) for image in images]
width = len(images) * THUMBNAIL_WIDTH
height = THUMBNAIL_HEIGHT
new_image = Image.new("RGBA", (width, height), color=(0, 0, 0, 0))
for i, im in enumerate(images):
im = convert_rgba(im)
im = ImageOps.pad(im, (THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT), color=(0, 0, 0, 0), method=Image.Resampling.LANCZOS)
new_image.paste(im, (i * THUMBNAIL_WIDTH, 0))
new_image.save(output_filename, quality=THUMBNAIL_QUALITY)
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