src/comfyui/custom_nodes/ComfyUI_UltimateSDUpscale/modules/processing.py

from PIL import Image, ImageFilter
import torch
import math
from nodes import common_ksampler, VAEEncode, VAEDecode, VAEDecodeTiled
from utils import pil_to_tensor, tensor_to_pil, get_crop_region, expand_crop, crop_cond
from modules import shared

if (not hasattr(Image, 'Resampling')):  # For older versions of Pillow
    Image.Resampling = Image


class StableDiffusionProcessing:

    def __init__(self, init_img, model, positive, negative, vae, seed, steps, cfg, sampler_name, scheduler, denoise, upscale_by, uniform_tile_mode, tiled_decode):
        # Variables used by the USDU script
        self.init_images = [init_img]
        self.image_mask = None
        self.mask_blur = 0
        self.inpaint_full_res_padding = 0
        self.width = init_img.width
        self.height = init_img.height

        # ComfyUI Sampler inputs
        self.model = model
        self.positive = positive
        self.negative = negative
        self.vae = vae
        self.seed = seed
        self.steps = steps
        self.cfg = cfg
        self.sampler_name = sampler_name
        self.scheduler = scheduler
        self.denoise = denoise

        # Variables used only by this script
        self.init_size = init_img.width, init_img.height
        self.upscale_by = upscale_by
        self.uniform_tile_mode = uniform_tile_mode
        self.tiled_decode = tiled_decode
        self.vae_decoder = VAEDecode()
        self.vae_encoder = VAEEncode()
        self.vae_decoder_tiled = VAEDecodeTiled()

        # Other required A1111 variables for the USDU script that is currently unused in this script
        self.extra_generation_params = {}


class Processed:

    def __init__(self, p: StableDiffusionProcessing, images: list, seed: int, info: str):
        self.images = images
        self.seed = seed
        self.info = info

    def infotext(self, p: StableDiffusionProcessing, index):
        return None


def fix_seed(p: StableDiffusionProcessing):
    pass


def process_images(p: StableDiffusionProcessing) -> Processed:
    # Where the main image generation happens in A1111

    # Setup
    image_mask = p.image_mask.convert('L')
    init_image = p.init_images[0]

    # Locate the white region of the mask outlining the tile and add padding
    crop_region = get_crop_region(image_mask, p.inpaint_full_res_padding)

    if p.uniform_tile_mode:
        # Expand the crop region to match the processing size ratio and then resize it to the processing size
        x1, y1, x2, y2 = crop_region
        crop_width = x2 - x1
        crop_height = y2 - y1
        crop_ratio = crop_width / crop_height
        p_ratio = p.width / p.height
        if crop_ratio > p_ratio:
            target_width = crop_width
            target_height = round(crop_width / p_ratio)
        else:
            target_width = round(crop_height * p_ratio)
            target_height = crop_height
        crop_region, _ = expand_crop(crop_region, image_mask.width, image_mask.height, target_width, target_height)
        tile_size = p.width, p.height
    else:
        # Uses the minimal size that can fit the mask, minimizes tile size but may lead to image sizes that the model is not trained on
        x1, y1, x2, y2 = crop_region
        crop_width = x2 - x1
        crop_height = y2 - y1
        target_width = math.ceil(crop_width / 8) * 8
        target_height = math.ceil(crop_height / 8) * 8
        crop_region, tile_size = expand_crop(crop_region, image_mask.width,
                                             image_mask.height, target_width, target_height)

    # Blur the mask
    if p.mask_blur > 0:
        image_mask = image_mask.filter(ImageFilter.GaussianBlur(p.mask_blur))

    # Crop the images to get the tiles that will be used for generation
    tiles = [img.crop(crop_region) for img in shared.batch]

    # Assume the same size for all images in the batch
    initial_tile_size = tiles[0].size

    # Resize if necessary
    for i, tile in enumerate(tiles):
        if tile.size != tile_size:
            tiles[i] = tile.resize(tile_size, Image.Resampling.LANCZOS)

    # Crop conditioning
    positive_cropped = crop_cond(p.positive, crop_region, p.init_size, init_image.size, tile_size)
    negative_cropped = crop_cond(p.negative, crop_region, p.init_size, init_image.size, tile_size)

    # Encode the image
    batched_tiles = torch.cat([pil_to_tensor(tile) for tile in tiles], dim=0)
    (latent,) = p.vae_encoder.encode(p.vae, batched_tiles)

    # Generate samples
    (samples,) = common_ksampler(p.model, p.seed, p.steps, p.cfg, p.sampler_name,
                                 p.scheduler, positive_cropped, negative_cropped, latent, denoise=p.denoise)

    # Decode the sample
    if not p.tiled_decode:
        (decoded,) = p.vae_decoder.decode(p.vae, samples)
    else:
        print("[USDU] Using tiled decode")
        (decoded,) = p.vae_decoder_tiled.decode(p.vae, samples, 512)  # Default tile size is 512

    # Convert the sample to a PIL image
    tiles_sampled = [tensor_to_pil(decoded, i) for i in range(len(decoded))]

    for i, tile_sampled in enumerate(tiles_sampled):
        init_image = shared.batch[i]

        # Resize back to the original size
        if tile_sampled.size != initial_tile_size:
            tile_sampled = tile_sampled.resize(initial_tile_size, Image.Resampling.LANCZOS)
            

        # Put the tile into position
        image_tile_only = Image.new('RGBA', init_image.size)
        image_tile_only.paste(tile_sampled, crop_region[:2])

        # Add the mask as an alpha channel
        # Must make a copy due to the possibility of an edge becoming black
        temp = image_tile_only.copy()
        temp.putalpha(image_mask)
        image_tile_only.paste(temp, image_tile_only)

        # Add back the tile to the initial image according to the mask in the alpha channel
        result = init_image.convert('RGBA')
        result.alpha_composite(image_tile_only)

        # Convert back to RGB
        result = result.convert('RGB')

        shared.batch[i] = result

    processed = Processed(p, [shared.batch[0]], p.seed, None)
    return processed