stable-diffusion-webui/webui.py

import argparse
import os
import sys

script_path = os.path.dirname(os.path.realpath(__file__))
sd_path = os.path.dirname(script_path)

# add parent directory to path; this is where Stable diffusion repo should be
path_dirs = [(sd_path, 'ldm', 'Stable Diffusion'), ('../../taming-transformers', 'taming', 'Taming Transformers')]
for d, must_exist, what in path_dirs:
    must_exist_path = os.path.abspath(os.path.join(script_path, d, must_exist))
    if not os.path.exists(must_exist_path):
        print(f"Warning: {what} not found at path {must_exist_path}", file=sys.stderr)
    else:
        sys.path.append(os.path.join(script_path, d))

import torch
import torch.nn as nn
import numpy as np
import gradio as gr
import gradio.utils
from omegaconf import OmegaConf
from PIL import Image, ImageFont, ImageDraw, PngImagePlugin, ImageFilter, ImageOps
from torch import autocast
import mimetypes
import random
import math
import html
import time
import json
import traceback
from collections import namedtuple
from contextlib import nullcontext
import signal

import k_diffusion.sampling
from ldm.util import instantiate_from_config
from ldm.models.diffusion.ddim import DDIMSampler
from ldm.models.diffusion.plms import PLMSSampler

# fix gradio phoning home
gradio.utils.version_check = lambda: None
gradio.utils.get_local_ip_address = lambda: '127.0.0.1'

# this is a fix for Windows users. Without it, javascript files will be served with text/html content-type and the bowser will not show any UI
mimetypes.init()
mimetypes.add_type('application/javascript', '.js')


# some of those options should not be changed at all because they would break the model, so I removed them from options.
opt_C = 4
opt_f = 8

LANCZOS = (Image.Resampling.LANCZOS if hasattr(Image, 'Resampling') else Image.LANCZOS)
invalid_filename_chars = '<>:"/\\|?*\n'
config_filename = "config.json"

parser = argparse.ArgumentParser()
parser.add_argument("--config", type=str, default=os.path.join(sd_path, "configs/stable-diffusion/v1-inference.yaml"), help="path to config which constructs model",)
parser.add_argument("--ckpt", type=str, default=os.path.join(sd_path, "models/ldm/stable-diffusion-v1/model.ckpt"), help="path to checkpoint of model",)
parser.add_argument("--gfpgan-dir", type=str, help="GFPGAN directory", default=('./src/gfpgan' if os.path.exists('./src/gfpgan') else './GFPGAN'))
parser.add_argument("--gfpgan-model", type=str, help="GFPGAN model file name", default='GFPGANv1.3.pth')
parser.add_argument("--no-half", action='store_true', help="do not switch the model to 16-bit floats")
parser.add_argument("--no-progressbar-hiding", action='store_true', help="do not hide progressbar in gradio UI (we hide it because it slows down ML if you have hardware accleration in browser)")
parser.add_argument("--max-batch-count", type=int, default=16, help="maximum batch count value for the UI")
parser.add_argument("--embeddings-dir", type=str, default='embeddings', help="embeddings dirtectory for textual inversion (default: embeddings)")
parser.add_argument("--allow-code", action='store_true', help="allow custom script execution from webui")
parser.add_argument("--lowvram", action='store_true', help="enamble stable diffusion model optimizations for low vram")
parser.add_argument("--precision", type=str, help="evaluate at this precision", choices=["full", "autocast"], default="autocast")

cmd_opts = parser.parse_args()

cpu = torch.device("cpu")
gpu = torch.device("cuda")
device = gpu if torch.cuda.is_available() else cpu

css_hide_progressbar = """
.wrap .m-12 svg { display:none!important; }
.wrap .m-12::before { content:"Loading..." }
.progress-bar { display:none!important; }
.meta-text { display:none!important; }
"""

SamplerData = namedtuple('SamplerData', ['name', 'constructor'])
samplers = [
    *[SamplerData(x[0], lambda funcname=x[1]: KDiffusionSampler(funcname)) for x in [
        ('Euler a', 'sample_euler_ancestral'),
        ('Euler', 'sample_euler'),
        ('LMS', 'sample_lms'),
        ('Heun', 'sample_heun'),
        ('DPM2', 'sample_dpm_2'),
        ('DPM2 a', 'sample_dpm_2_ancestral'),
    ] if hasattr(k_diffusion.sampling, x[1])],
    SamplerData('DDIM', lambda: VanillaStableDiffusionSampler(DDIMSampler)),
    SamplerData('PLMS', lambda: VanillaStableDiffusionSampler(PLMSSampler)),
]
samplers_for_img2img = [x for x in samplers if x.name != 'PLMS']

RealesrganModelInfo = namedtuple("RealesrganModelInfo", ["name", "location", "model", "netscale"])

try:
    from basicsr.archs.rrdbnet_arch import RRDBNet
    from realesrgan import RealESRGANer
    from realesrgan.archs.srvgg_arch import SRVGGNetCompact

    realesrgan_models = [
        RealesrganModelInfo(
            name="Real-ESRGAN 4x plus",
            location="https://github.com/xinntao/Real-ESRGAN/releases/download/v0.1.0/RealESRGAN_x4plus.pth",
            netscale=4, model=lambda: RRDBNet(num_in_ch=3, num_out_ch=3, num_feat=64, num_block=23, num_grow_ch=32, scale=4)
        ),
        RealesrganModelInfo(
            name="Real-ESRGAN 4x plus anime 6B",
            location="https://github.com/xinntao/Real-ESRGAN/releases/download/v0.2.2.4/RealESRGAN_x4plus_anime_6B.pth",
            netscale=4, model=lambda: RRDBNet(num_in_ch=3, num_out_ch=3, num_feat=64, num_block=6, num_grow_ch=32, scale=4)
        ),
        RealesrganModelInfo(
            name="Real-ESRGAN 2x plus",
            location="https://github.com/xinntao/Real-ESRGAN/releases/download/v0.2.1/RealESRGAN_x2plus.pth",
            netscale=2, model=lambda: RRDBNet(num_in_ch=3, num_out_ch=3, num_feat=64, num_block=23, num_grow_ch=32, scale=2)
        ),
    ]
    have_realesrgan = True
except Exception:
    print("Error importing Real-ESRGAN:", file=sys.stderr)
    print(traceback.format_exc(), file=sys.stderr)

    realesrgan_models = [RealesrganModelInfo('None', '', 0, None)]
    have_realesrgan = False

sd_upscalers = {
    "RealESRGAN": lambda img: upscale_with_realesrgan(img, 2, 0),
    "Lanczos": lambda img: img.resize((img.width*2, img.height*2), resample=LANCZOS),
    "None": lambda img: img
}


def gfpgan_model_path():
    places = [script_path, '.', os.path.join(cmd_opts.gfpgan_dir, 'experiments/pretrained_models')]
    files = [cmd_opts.gfpgan_model] + [os.path.join(dirname, cmd_opts.gfpgan_model) for dirname in places]
    found = [x for x in files if os.path.exists(x)]

    if len(found) == 0:
        raise Exception("GFPGAN model not found in paths: " + ", ".join(files))

    return found[0]


def gfpgan():
    return GFPGANer(model_path=gfpgan_model_path(), upscale=1, arch='clean', channel_multiplier=2, bg_upsampler=None)

def gfpgan_fix_faces(gfpgan_model, np_image):
    np_image_bgr = np_image[:, :, ::-1]
    cropped_faces, restored_faces, gfpgan_output_bgr = gfpgan_model.enhance(np_image_bgr, has_aligned=False, only_center_face=False, paste_back=True)
    np_image = gfpgan_output_bgr[:, :, ::-1]

    return np_image

have_gfpgan = False
try:
    model_path = gfpgan_model_path()

    if os.path.exists(cmd_opts.gfpgan_dir):
        sys.path.append(os.path.abspath(cmd_opts.gfpgan_dir))
    from gfpgan import GFPGANer

    have_gfpgan = True
except Exception:
    print("Error setting up GFPGAN:", file=sys.stderr)
    print(traceback.format_exc(), file=sys.stderr)



class Options:
    class OptionInfo:
        def __init__(self, default=None, label="", component=None, component_args=None):
            self.default = default
            self.label = label
            self.component = component
            self.component_args = component_args

    data = None
    data_labels = {
        "outdir": OptionInfo("", "Output dictectory; if empty, defaults to 'outputs/*'"),
        "samples_save": OptionInfo(True, "Save indiviual samples"),
        "samples_format": OptionInfo('png', 'File format for indiviual samples'),
        "grid_save": OptionInfo(True, "Save image grids"),
        "return_grid": OptionInfo(True, "Show grid in results for web"),
        "grid_format": OptionInfo('png', 'File format for grids'),
        "grid_extended_filename": OptionInfo(False, "Add extended info (seed, prompt) to filename when saving grid"),
        "grid_only_if_multiple": OptionInfo(True, "Do not save grids consisting of one picture"),
        "n_rows": OptionInfo(-1, "Grid row count; use -1 for autodetect and 0 for it to be same as batch size", gr.Slider, {"minimum": -1, "maximum": 16, "step": 1}),
        "jpeg_quality": OptionInfo(80, "Quality for saved jpeg images", gr.Slider, {"minimum": 1, "maximum": 100, "step": 1}),
        "export_for_4chan": OptionInfo(True, "If PNG image is larger than 4MB or any dimension is larger than 4000, downscale and save copy as JPG"),
        "enable_pnginfo": OptionInfo(True, "Save text information about generation parameters as chunks to png files"),
        "font": OptionInfo("arial.ttf", "Font for image grids  that have text"),
        "prompt_matrix_add_to_start": OptionInfo(True, "In prompt matrix, add the variable combination of text to the start of the prompt, rather than the end"),
    }

    def __init__(self):
        self.data = {k: v.default for k, v in self.data_labels.items()}

    def __setattr__(self, key, value):
        if self.data is not None:
            if key in self.data:
                self.data[key] = value

        return super(Options, self).__setattr__(key, value)

    def __getattr__(self, item):
        if self.data is not None:
            if item in self.data:
                return self.data[item]

        if item in self.data_labels:
            return self.data_labels[item].default

        return super(Options, self).__getattribute__(item)

    def save(self, filename):
        with open(filename, "w", encoding="utf8") as file:
            json.dump(self.data, file)

    def load(self, filename):
        with open(filename, "r", encoding="utf8") as file:
            self.data = json.load(file)


def load_model_from_config(config, ckpt, verbose=False):
    print(f"Loading model from {ckpt}")
    pl_sd = torch.load(ckpt, map_location="cpu")
    if "global_step" in pl_sd:
        print(f"Global Step: {pl_sd['global_step']}")
    sd = pl_sd["state_dict"]
    model = instantiate_from_config(config.model)
    m, u = model.load_state_dict(sd, strict=False)
    if len(m) > 0 and verbose:
        print("missing keys:")
        print(m)
    if len(u) > 0 and verbose:
        print("unexpected keys:")
        print(u)

    model.eval()
    return model


module_in_gpu = None


def setup_for_low_vram(sd_model):
    parents = {}

    def send_me_to_gpu(module, _):
        """send this module to GPU; send whatever tracked module was previous in GPU to CPU;
        we add this as forward_pre_hook to a lot of modules and this way all but one of them will
        be in CPU
        """
        global module_in_gpu

        module = parents.get(module, module)

        if module_in_gpu == module:
            return

        if module_in_gpu is not None:
            module_in_gpu.to(cpu)

        module.to(gpu)
        module_in_gpu = module

    # see below for register_forward_pre_hook;
    # first_stage_model does not use forward(), it uses encode/decode, so register_forward_pre_hook is
    # useless here, and we just replace those methods
    def first_stage_model_encode_wrap(self, encoder, x):
        send_me_to_gpu(self, None)
        return encoder(x)

    def first_stage_model_decode_wrap(self, decoder, z):
        send_me_to_gpu(self, None)
        return decoder(z)

    # remove three big modules, cond, first_stage, and unet from the model and then
    # send the model to GPU. Then put modules back. the modules will be in CPU.
    stored = sd_model.cond_stage_model.transformer, sd_model.first_stage_model, sd_model.model
    sd_model.cond_stage_model.transformer, sd_model.first_stage_model, sd_model.model = None, None, None
    sd_model.to(device)
    sd_model.cond_stage_model.transformer, sd_model.first_stage_model, sd_model.model = stored

    # register hooks for those the first two models
    sd_model.cond_stage_model.transformer.register_forward_pre_hook(send_me_to_gpu)
    sd_model.first_stage_model.register_forward_pre_hook(send_me_to_gpu)
    sd_model.first_stage_model.encode = lambda x, en=sd_model.first_stage_model.encode: first_stage_model_encode_wrap(sd_model.first_stage_model, en, x)
    sd_model.first_stage_model.decode = lambda z, de=sd_model.first_stage_model.decode: first_stage_model_decode_wrap(sd_model.first_stage_model, de, z)
    parents[sd_model.cond_stage_model.transformer] = sd_model.cond_stage_model

    # the third remaining model is still too big for 4GB, so we also do the same for its submodules
    # so that only one of them is in GPU at a time
    diff_model = sd_model.model.diffusion_model
    stored = diff_model.input_blocks, diff_model.middle_block, diff_model.output_blocks, diff_model.time_embed
    diff_model.input_blocks, diff_model.middle_block, diff_model.output_blocks, diff_model.time_embed = None, None, None, None
    sd_model.model.to(device)
    diff_model.input_blocks, diff_model.middle_block, diff_model.output_blocks, diff_model.time_embed = stored

    # install hooks for bits of third model
    diff_model.time_embed.register_forward_pre_hook(send_me_to_gpu)
    for block in diff_model.input_blocks:
        block.register_forward_pre_hook(send_me_to_gpu)
    diff_model.middle_block.register_forward_pre_hook(send_me_to_gpu)
    for block in diff_model.output_blocks:
        block.register_forward_pre_hook(send_me_to_gpu)


def create_random_tensors(shape, seeds):
    xs = []
    for seed in seeds:
        torch.manual_seed(seed)

        # randn results depend on device; gpu and cpu get different results for same seed;
        # the way I see it, it's better to do this on CPU, so that everyone gets same result;
        # but the original script had it like this so i do not dare change it for now because
        # it will break everyone's seeds.
        xs.append(torch.randn(shape, device=device))
    x = torch.stack(xs)
    return x


def torch_gc():
    if torch.cuda.is_available():
        torch.cuda.empty_cache()
        torch.cuda.ipc_collect()


def save_image(image, path, basename, seed=None, prompt=None, extension='png', info=None, short_filename=False):

    if short_filename or prompt is None or seed is None:
        filename = f"{basename}"
    else:
        filename = f"{basename}-{seed}-{sanitize_filename_part(prompt)[:128]}"

    if extension == 'png' and opts.enable_pnginfo and info is not None:
        pnginfo = PngImagePlugin.PngInfo()
        pnginfo.add_text("parameters", info)
    else:
        pnginfo = None

    os.makedirs(path, exist_ok=True)
    fullfn = os.path.join(path, f"{filename}.{extension}")
    image.save(fullfn, quality=opts.jpeg_quality, pnginfo=pnginfo)

    target_side_length = 4000
    oversize = image.width > target_side_length or image.height > target_side_length
    if opts.export_for_4chan and (oversize or os.stat(fullfn).st_size > 4 * 1024 * 1024):
        ratio = image.width / image.height

        if oversize and ratio > 1:
            image = image.resize((target_side_length, image.height * target_side_length // image.width), LANCZOS)
        elif oversize:
            image = image.resize((image.width * target_side_length // image.height, target_side_length), LANCZOS)

        image.save(os.path.join(path, f"{filename}.jpg"), quality=opts.jpeg_quality, pnginfo=pnginfo)




def sanitize_filename_part(text):
    return text.replace(' ', '_').translate({ord(x): '' for x in invalid_filename_chars})[:128]


def plaintext_to_html(text):
    text = "".join([f"<p>{html.escape(x)}</p>\n" for x in text.split('\n')])
    return text

def image_grid(imgs, batch_size=1, rows=None):
    if rows is None:
        if opts.n_rows > 0:
            rows = opts.n_rows
        elif opts.n_rows == 0:
            rows = batch_size
        else:
            rows = math.sqrt(len(imgs))
            rows = round(rows)

    cols = math.ceil(len(imgs) / rows)

    w, h = imgs[0].size
    grid = Image.new('RGB', size=(cols * w, rows * h), color='black')

    for i, img in enumerate(imgs):
        grid.paste(img, box=(i % cols * w, i // cols * h))

    return grid


Grid = namedtuple("Grid", ["tiles", "tile_w", "tile_h", "image_w", "image_h", "overlap"])


def split_grid(image, tile_w=512, tile_h=512, overlap=64):
    w = image.width
    h = image.height

    now = tile_w - overlap  # non-overlap width
    noh = tile_h - overlap

    cols = math.ceil((w - overlap) / now)
    rows = math.ceil((h - overlap) / noh)

    grid = Grid([], tile_w, tile_h, w, h, overlap)
    for row in range(rows):
        row_images = []

        y = row * noh

        if y + tile_h >= h:
            y = h - tile_h

        for col in range(cols):
            x = col * now

            if x+tile_w >= w:
                x = w - tile_w

            tile = image.crop((x, y, x + tile_w, y + tile_h))

            row_images.append([x, tile_w, tile])

        grid.tiles.append([y, tile_h, row_images])

    return grid


def combine_grid(grid):
    def make_mask_image(r):
        r = r * 255 / grid.overlap
        r = r.astype(np.uint8)
        return Image.fromarray(r, 'L')

    mask_w = make_mask_image(np.arange(grid.overlap, dtype=np.float32).reshape((1, grid.overlap)).repeat(grid.tile_h, axis=0))
    mask_h = make_mask_image(np.arange(grid.overlap, dtype=np.float32).reshape((grid.overlap, 1)).repeat(grid.image_w, axis=1))

    combined_image = Image.new("RGB", (grid.image_w, grid.image_h))
    for y, h, row in grid.tiles:
        combined_row = Image.new("RGB", (grid.image_w, h))
        for x, w, tile in row:
            if x == 0:
                combined_row.paste(tile, (0, 0))
                continue

            combined_row.paste(tile.crop((0, 0, grid.overlap, h)), (x, 0), mask=mask_w)
            combined_row.paste(tile.crop((grid.overlap, 0, w, h)), (x + grid.overlap, 0))

        if y == 0:
            combined_image.paste(combined_row, (0, 0))
            continue

        combined_image.paste(combined_row.crop((0, 0, combined_row.width, grid.overlap)), (0, y), mask=mask_h)
        combined_image.paste(combined_row.crop((0, grid.overlap, combined_row.width, h)), (0, y + grid.overlap))

    return combined_image


class GridAnnotation:
    def __init__(self, text='', is_active=True):
        self.text = text
        self.is_active = is_active
        self.size = None


def draw_grid_annotations(im, width, height, hor_texts, ver_texts):
    def wrap(drawing, text, font, line_length):
        lines = ['']
        for word in text.split():
            line = f'{lines[-1]} {word}'.strip()
            if drawing.textlength(line, font=font) <= line_length:
                lines[-1] = line
            else:
                lines.append(word)
        return lines

    def draw_texts(drawing, draw_x, draw_y, lines):
        for i, line in enumerate(lines):
            drawing.multiline_text((draw_x, draw_y + line.size[1] / 2), line.text, font=fnt, fill=color_active if line.is_active else color_inactive, anchor="mm", align="center")

            if not line.is_active:
                drawing.line((draw_x - line.size[0]//2, draw_y + line.size[1]//2, draw_x + line.size[0]//2, draw_y + line.size[1]//2), fill=color_inactive, width=4)

            draw_y += line.size[1] + line_spacing

    fontsize = (width + height) // 25
    line_spacing = fontsize // 2
    fnt = ImageFont.truetype(opts.font, fontsize)
    color_active = (0, 0, 0)
    color_inactive = (153, 153, 153)

    pad_left = width * 3 // 4 if len(ver_texts) > 1 else 0

    cols = im.width // width
    rows = im.height // height

    assert cols == len(hor_texts), f'bad number of horizontal texts: {len(hor_texts)}; must be {cols}'
    assert rows == len(ver_texts), f'bad number of vertical texts: {len(ver_texts)}; must be {rows}'

    calc_img = Image.new("RGB", (1, 1), "white")
    calc_d = ImageDraw.Draw(calc_img)

    for texts, allowed_width in zip(hor_texts + ver_texts, [width] * len(hor_texts) + [pad_left] * len(ver_texts)):
        items = [] + texts
        texts.clear()

        for line in items:
            wrapped = wrap(calc_d, line.text, fnt, allowed_width)
            texts += [GridAnnotation(x, line.is_active) for x in wrapped]

        for line in texts:
            bbox = calc_d.multiline_textbbox((0, 0), line.text, font=fnt)
            line.size = (bbox[2] - bbox[0], bbox[3] - bbox[1])

    hor_text_heights = [sum([line.size[1] + line_spacing for line in lines]) - line_spacing for lines in hor_texts]
    ver_text_heights = [sum([line.size[1] + line_spacing for line in lines]) - line_spacing * len(lines) for lines in ver_texts]

    pad_top = max(hor_text_heights) + line_spacing * 2

    result = Image.new("RGB", (im.width + pad_left, im.height + pad_top), "white")
    result.paste(im, (pad_left, pad_top))

    d = ImageDraw.Draw(result)

    for col in range(cols):
        x = pad_left + width * col + width / 2
        y = pad_top / 2 - hor_text_heights[col] / 2

        draw_texts(d, x, y, hor_texts[col])

    for row in range(rows):
        x = pad_left / 2
        y = pad_top + height * row + height / 2 - ver_text_heights[row] / 2

        draw_texts(d, x, y, ver_texts[row])

    return result


def draw_prompt_matrix(im, width, height, all_prompts):
    prompts = all_prompts[1:]
    boundary = math.ceil(len(prompts) / 2)

    prompts_horiz = prompts[:boundary]
    prompts_vert = prompts[boundary:]

    hor_texts = [[GridAnnotation(x, is_active=pos & (1 << i) != 0) for i, x in enumerate(prompts_horiz)] for pos in range(1 << len(prompts_horiz))]
    ver_texts = [[GridAnnotation(x, is_active=pos & (1 << i) != 0) for i, x in enumerate(prompts_vert)] for pos in range(1 << len(prompts_vert))]

    return draw_grid_annotations(im, width, height, hor_texts, ver_texts)


def draw_xy_grid(xs, ys, x_label, y_label, cell):
    res = []

    ver_texts = [[GridAnnotation(y_label(y))] for y in ys]
    hor_texts = [[GridAnnotation(x_label(x))] for x in xs]

    for y in ys:
        for x in xs:
            res.append(cell(x, y))


    grid = image_grid(res, rows=len(ys))
    grid = draw_grid_annotations(grid, res[0].width, res[0].height, hor_texts, ver_texts)

    return grid


def resize_image(resize_mode, im, width, height):
    if resize_mode == 0:
        res = im.resize((width, height), resample=LANCZOS)
    elif resize_mode == 1:
        ratio = width / height
        src_ratio = im.width / im.height

        src_w = width if ratio > src_ratio else im.width * height // im.height
        src_h = height if ratio <= src_ratio else im.height * width // im.width

        resized = im.resize((src_w, src_h), resample=LANCZOS)
        res = Image.new("RGB", (width, height))
        res.paste(resized, box=(width // 2 - src_w // 2, height // 2 - src_h // 2))
    else:
        ratio = width / height
        src_ratio = im.width / im.height

        src_w = width if ratio < src_ratio else im.width * height // im.height
        src_h = height if ratio >= src_ratio else im.height * width // im.width

        resized = im.resize((src_w, src_h), resample=LANCZOS)
        res = Image.new("RGB", (width, height))
        res.paste(resized, box=(width // 2 - src_w // 2, height // 2 - src_h // 2))

        if ratio < src_ratio:
            fill_height = height // 2 - src_h // 2
            res.paste(resized.resize((width, fill_height), box=(0, 0, width, 0)), box=(0, 0))
            res.paste(resized.resize((width, fill_height), box=(0, resized.height, width, resized.height)), box=(0, fill_height + src_h))
        elif ratio > src_ratio:
            fill_width = width // 2 - src_w // 2
            res.paste(resized.resize((fill_width, height), box=(0, 0, 0, height)), box=(0, 0))
            res.paste(resized.resize((fill_width, height), box=(resized.width, 0, resized.width, height)), box=(fill_width + src_w, 0))

    return res


def wrap_gradio_call(func):
    def f(*p1, **p2):
        t = time.perf_counter()
        res = list(func(*p1, **p2))
        elapsed = time.perf_counter() - t

        # last item is always HTML
        res[-1] = res[-1] + f"<p class='performance'>Time taken: {elapsed:.2f}s</p>"

        return tuple(res)

    return f


class StableDiffusionModelHijack:
    ids_lookup = {}
    word_embeddings = {}
    word_embeddings_checksums = {}
    fixes = None
    comments = None
    dir_mtime = None

    def load_textual_inversion_embeddings(self, dirname, model):
        mt = os.path.getmtime(dirname)
        if self.dir_mtime is not None and mt <= self.dir_mtime:
            return

        self.dir_mtime = mt
        self.ids_lookup.clear()
        self.word_embeddings.clear()

        tokenizer = model.cond_stage_model.tokenizer

        def const_hash(a):
            r = 0
            for v in a:
                r = (r * 281 ^ int(v) * 997) & 0xFFFFFFFF
            return r

        def process_file(path, filename):
            name = os.path.splitext(filename)[0]

            data = torch.load(path)
            param_dict = data['string_to_param']
            assert len(param_dict) == 1, 'embedding file has multiple terms in it'
            emb = next(iter(param_dict.items()))[1].reshape(768)
            self.word_embeddings[name] = emb
            self.word_embeddings_checksums[name] = f'{const_hash(emb)&0xffff:04x}'

            ids = tokenizer([name], add_special_tokens=False)['input_ids'][0]

            first_id = ids[0]
            if first_id not in self.ids_lookup:
                self.ids_lookup[first_id] = []
            self.ids_lookup[first_id].append((ids, name))

        for fn in os.listdir(dirname):
            try:
                process_file(os.path.join(dirname, fn), fn)
            except Exception:
                print(f"Error loading emedding {fn}:", file=sys.stderr)
                print(traceback.format_exc(), file=sys.stderr)
                continue

        print(f"Loaded a total of {len(self.word_embeddings)} text inversion embeddings.")

    def hijack(self, m):
        model_embeddings = m.cond_stage_model.transformer.text_model.embeddings

        model_embeddings.token_embedding = EmbeddingsWithFixes(model_embeddings.token_embedding, self)
        m.cond_stage_model = FrozenCLIPEmbedderWithCustomWords(m.cond_stage_model, self)


class FrozenCLIPEmbedderWithCustomWords(torch.nn.Module):
    def __init__(self, wrapped, hijack):
        super().__init__()
        self.wrapped = wrapped
        self.hijack = hijack
        self.tokenizer = wrapped.tokenizer
        self.max_length = wrapped.max_length
        self.token_mults = {}

        tokens_with_parens = [(k, v) for k, v in self.tokenizer.get_vocab().items() if '(' in k or ')' in k or '[' in k or ']' in k]
        for text, ident in tokens_with_parens:
            mult = 1.0
            for c in text:
                if c == '[':
                    mult /= 1.1
                if c == ']':
                    mult *= 1.1
                if c == '(':
                    mult *= 1.1
                if c == ')':
                    mult /= 1.1

            if mult != 1.0:
                self.token_mults[ident] = mult

    def forward(self, text):
        self.hijack.fixes = []
        self.hijack.comments = []
        remade_batch_tokens = []
        id_start = self.wrapped.tokenizer.bos_token_id
        id_end = self.wrapped.tokenizer.eos_token_id
        maxlen = self.wrapped.max_length - 2
        used_custom_terms = []

        cache = {}
        batch_tokens = self.wrapped.tokenizer(text, truncation=False, add_special_tokens=False)["input_ids"]
        batch_multipliers = []
        for tokens in batch_tokens:
            tuple_tokens = tuple(tokens)

            if tuple_tokens in cache:
                remade_tokens, fixes, multipliers = cache[tuple_tokens]
            else:
                fixes = []
                remade_tokens = []
                multipliers = []
                mult = 1.0

                i = 0
                while i < len(tokens):
                    token = tokens[i]

                    possible_matches = self.hijack.ids_lookup.get(token, None)

                    mult_change = self.token_mults.get(token)
                    if mult_change is not None:
                        mult *= mult_change
                    elif possible_matches is None:
                        remade_tokens.append(token)
                        multipliers.append(mult)
                    else:
                        found = False
                        for ids, word in possible_matches:
                            if tokens[i:i+len(ids)] == ids:
                                fixes.append((len(remade_tokens), word))
                                remade_tokens.append(777)
                                multipliers.append(mult)
                                i += len(ids) - 1
                                found = True
                                used_custom_terms.append((word, self.hijack.word_embeddings_checksums[word]))
                                break

                        if not found:
                            remade_tokens.append(token)
                            multipliers.append(mult)

                    i += 1

                if len(remade_tokens) > maxlen - 2:
                    vocab = {v: k for k, v in self.wrapped.tokenizer.get_vocab().items()}
                    ovf = remade_tokens[maxlen - 2:]
                    overflowing_words = [vocab.get(int(x), "") for x in ovf]
                    overflowing_text = self.wrapped.tokenizer.convert_tokens_to_string(''.join(overflowing_words))

                    self.hijack.comments.append(f"Warning: too many input tokens; some ({len(overflowing_words)}) have been truncated:\n{overflowing_text}\n")

                remade_tokens = remade_tokens + [id_end] * (maxlen - 2 - len(remade_tokens))
                remade_tokens = [id_start] + remade_tokens[0:maxlen-2] + [id_end]
                cache[tuple_tokens] = (remade_tokens, fixes, multipliers)

            multipliers = multipliers + [1.0] * (maxlen - 2 - len(multipliers))
            multipliers = [1.0] + multipliers[0:maxlen - 2] + [1.0]

            remade_batch_tokens.append(remade_tokens)
            self.hijack.fixes.append(fixes)
            batch_multipliers.append(multipliers)

        if len(used_custom_terms) > 0:
            self.hijack.comments.append("Used custom terms: " + ", ".join([f'{word} [{checksum}]' for word, checksum in used_custom_terms]))

        tokens = torch.asarray(remade_batch_tokens).to(device)
        outputs = self.wrapped.transformer(input_ids=tokens)
        z = outputs.last_hidden_state

        # restoring original mean is likely not correct, but it seems to work well to prevent artifacts that happen otherwise
        batch_multipliers = torch.asarray(np.array(batch_multipliers)).to(device)
        original_mean = z.mean()
        z *= batch_multipliers.reshape(batch_multipliers.shape + (1,)).expand(z.shape)
        new_mean = z.mean()
        z *= original_mean / new_mean

        return z


class EmbeddingsWithFixes(nn.Module):
    def __init__(self, wrapped, embeddings):
        super().__init__()
        self.wrapped = wrapped
        self.embeddings = embeddings

    def forward(self, input_ids):
        batch_fixes = self.embeddings.fixes
        self.embeddings.fixes = None

        inputs_embeds = self.wrapped(input_ids)

        if batch_fixes is not None:
            for fixes, tensor in zip(batch_fixes, inputs_embeds):
                for offset, word in fixes:
                    tensor[offset] = self.embeddings.word_embeddings[word]

        return inputs_embeds


class StableDiffusionProcessing:
    def __init__(self, outpath=None, prompt="", seed=-1, sampler_index=0, batch_size=1, n_iter=1, steps=50, cfg_scale=7.0, width=512, height=512, prompt_matrix=False, use_GFPGAN=False, do_not_save_samples=False, do_not_save_grid=False, extra_generation_params=None, overlay_images=None, negative_prompt=None):
        self.outpath: str = outpath
        self.prompt: str = prompt
        self.negative_prompt: str = (negative_prompt or "")
        self.seed: int = seed
        self.sampler_index: int = sampler_index
        self.batch_size: int = batch_size
        self.n_iter: int = n_iter
        self.steps: int = steps
        self.cfg_scale: float = cfg_scale
        self.width: int = width
        self.height: int = height
        self.prompt_matrix: bool = prompt_matrix
        self.use_GFPGAN: bool = use_GFPGAN
        self.do_not_save_samples: bool = do_not_save_samples
        self.do_not_save_grid: bool = do_not_save_grid
        self.extra_generation_params: dict = extra_generation_params
        self.overlay_images = overlay_images
        self.paste_to = None

    def init(self):
        pass

    def sample(self, x, conditioning, unconditional_conditioning):
        raise NotImplementedError()


def p_sample_ddim_hook(sampler_wrapper, x_dec, cond, ts, *args, **kwargs):
    if sampler_wrapper.mask is not None:
        img_orig = sampler_wrapper.sampler.model.q_sample(sampler_wrapper.init_latent, ts)
        x_dec = img_orig * sampler_wrapper.mask + sampler_wrapper.nmask * x_dec

    return sampler_wrapper.orig_p_sample_ddim(x_dec, cond, ts, *args, **kwargs)


class VanillaStableDiffusionSampler:
    def __init__(self, constructor):
        self.sampler = constructor(sd_model)
        self.orig_p_sample_ddim = self.sampler.p_sample_ddim
        self.mask = None
        self.nmask = None
        self.init_latent = None

    def sample_img2img(self, p, x, noise, conditioning, unconditional_conditioning):
        t_enc = int(min(p.denoising_strength, 0.999) * p.steps)

        # existing code fail with cetin step counts, like 9
        try:
            self.sampler.make_schedule(ddim_num_steps=p.steps, verbose=False)
        except Exception:
            self.sampler.make_schedule(ddim_num_steps=p.steps+1, verbose=False)

        x1 = self.sampler.stochastic_encode(x, torch.tensor([t_enc] * int(x.shape[0])).to(device), noise=noise)

        self.sampler.p_sample_ddim = lambda x_dec, cond, ts, *args, **kwargs: p_sample_ddim_hook(self, x_dec, cond, ts, *args, **kwargs)
        self.mask = p.mask
        self.nmask = p.nmask
        self.init_latent = p.init_latent

        samples = self.sampler.decode(x1, conditioning, t_enc, unconditional_guidance_scale=p.cfg_scale, unconditional_conditioning=unconditional_conditioning)

        return samples


    def sample(self, p: StableDiffusionProcessing, x, conditioning, unconditional_conditioning):
        samples_ddim, _ = self.sampler.sample(S=p.steps, conditioning=conditioning, batch_size=int(x.shape[0]), shape=x[0].shape, verbose=False, unconditional_guidance_scale=p.cfg_scale, unconditional_conditioning=unconditional_conditioning, x_T=x)
        return samples_ddim


class CFGDenoiser(nn.Module):
    def __init__(self, model):
        super().__init__()
        self.inner_model = model

    def forward(self, x, sigma, uncond, cond, cond_scale):
        x_in = torch.cat([x] * 2)
        sigma_in = torch.cat([sigma] * 2)
        cond_in = torch.cat([uncond, cond])
        uncond, cond = self.inner_model(x_in, sigma_in, cond=cond_in).chunk(2)
        return uncond + (cond - uncond) * cond_scale


class KDiffusionSampler:
    def __init__(self, funcname):
        self.model_wrap = k_diffusion.external.CompVisDenoiser(sd_model)
        self.funcname = funcname
        self.func = getattr(k_diffusion.sampling, self.funcname)
        self.model_wrap_cfg = CFGDenoiser(self.model_wrap)

    def sample_img2img(self, p, x, noise, conditioning, unconditional_conditioning):
        t_enc = int(min(p.denoising_strength, 0.999) * p.steps)
        sigmas = self.model_wrap.get_sigmas(p.steps)
        noise = noise * sigmas[p.steps - t_enc - 1]

        xi = x + noise

        if p.mask is not None:
            if p.inpainting_fill == 2:
                xi = xi * p.mask + noise * p.nmask
            elif p.inpainting_fill == 3:
                xi = xi * p.mask

        sigma_sched = sigmas[p.steps - t_enc - 1:]

        def mask_cb(v):
            v["denoised"][:] = v["denoised"][:] * p.nmask + p.init_latent * p.mask

        return self.func(self.model_wrap_cfg, xi, sigma_sched, extra_args={'cond': conditioning, 'uncond': unconditional_conditioning, 'cond_scale': p.cfg_scale}, disable=False, callback=mask_cb if p.mask is not None else None)


    def sample(self, p: StableDiffusionProcessing, x, conditioning, unconditional_conditioning):
        sigmas = self.model_wrap.get_sigmas(p.steps)
        x = x * sigmas[0]

        samples_ddim = self.func(self.model_wrap_cfg, x, sigmas, extra_args={'cond': conditioning, 'uncond': unconditional_conditioning, 'cond_scale': p.cfg_scale}, disable=False)
        return samples_ddim


Processed = namedtuple('Processed', ['images','seed', 'info'])


def process_images(p: StableDiffusionProcessing) -> Processed:
    """this is the main loop that both txt2img and img2img use; it calls func_init once inside all the scopes and func_sample once per batch"""

    prompt = p.prompt
    model = sd_model

    assert p.prompt is not None
    torch_gc()

    seed = int(random.randrange(4294967294) if p.seed == -1 else p.seed)

    sample_path = os.path.join(p.outpath, "samples")
    os.makedirs(sample_path, exist_ok=True)
    base_count = len(os.listdir(sample_path))
    grid_count = len(os.listdir(p.outpath)) - 1

    comments = []

    prompt_matrix_parts = []
    if p.prompt_matrix:
        all_prompts = []
        prompt_matrix_parts = prompt.split("|")
        combination_count = 2 ** (len(prompt_matrix_parts) - 1)
        for combination_num in range(combination_count):
            selected_prompts = [text.strip().strip(',') for n, text in enumerate(prompt_matrix_parts[1:]) if combination_num & (1 << n)]

            if opts.prompt_matrix_add_to_start:
                selected_prompts = selected_prompts + [prompt_matrix_parts[0]]
            else:
                selected_prompts = [prompt_matrix_parts[0]] + selected_prompts

            all_prompts.append(", ".join(selected_prompts))

        p.n_iter = math.ceil(len(all_prompts) / p.batch_size)
        all_seeds = len(all_prompts) * [seed]

        print(f"Prompt matrix will create {len(all_prompts)} images using a total of {p.n_iter} batches.")
    else:
        all_prompts = p.batch_size * p.n_iter * [prompt]
        all_seeds = [seed + x for x in range(len(all_prompts))]

    generation_params = {
        "Steps": p.steps,
        "Sampler": samplers[p.sampler_index].name,
        "CFG scale": p.cfg_scale,
        "Seed": seed,
        "GFPGAN": ("GFPGAN" if p.use_GFPGAN else None)
    }

    if p.extra_generation_params is not None:
        generation_params.update(p.extra_generation_params)

    generation_params_text = ", ".join([k if k == v else f'{k}: {v}' for k, v in generation_params.items() if v is not None])

    def infotext():
        return f"{prompt}\n{generation_params_text}".strip() + "".join(["\n\n" + x for x in comments])

    if os.path.exists(cmd_opts.embeddings_dir):
        model_hijack.load_textual_inversion_embeddings(cmd_opts.embeddings_dir, model)

    output_images = []
    precision_scope = autocast if cmd_opts.precision == "autocast" else nullcontext
    ema_scope = (nullcontext if cmd_opts.lowvram else model.ema_scope)
    with torch.no_grad(), precision_scope("cuda"), ema_scope():
        p.init()

        for n in range(p.n_iter):
            prompts = all_prompts[n * p.batch_size:(n + 1) * p.batch_size]
            seeds = all_seeds[n * p.batch_size:(n + 1) * p.batch_size]

            uc = model.get_learned_conditioning(len(prompts) * [p.negative_prompt])
            c = model.get_learned_conditioning(prompts)

            if len(model_hijack.comments) > 0:
                comments += model_hijack.comments

            # we manually generate all input noises because each one should have a specific seed
            x = create_random_tensors([opt_C, p.height // opt_f, p.width // opt_f], seeds=seeds)

            samples_ddim = p.sample(x=x, conditioning=c, unconditional_conditioning=uc)

            x_samples_ddim = model.decode_first_stage(samples_ddim)
            x_samples_ddim = torch.clamp((x_samples_ddim + 1.0) / 2.0, min=0.0, max=1.0)

            if p.prompt_matrix or opts.samples_save or opts.grid_save:
                for i, x_sample in enumerate(x_samples_ddim):
                    x_sample = 255. * np.moveaxis(x_sample.cpu().numpy(), 0, 2)
                    x_sample = x_sample.astype(np.uint8)

                    if p.use_GFPGAN:
                        torch_gc()

                        gfpgan_model = gfpgan()
                        x_sample = gfpgan_fix_faces(gfpgan_model, x_sample)

                    image = Image.fromarray(x_sample)

                    if p.overlay_images is not None and i < len(p.overlay_images):
                        overlay = p.overlay_images[i]

                        if p.paste_to is not None:
                            x, y, w, h = p.paste_to
                            base_image = Image.new('RGBA', (overlay.width, overlay.height))
                            image = resize_image(1, image, w, h)
                            base_image.paste(image, (x, y))
                            image = base_image

                        image = image.convert('RGBA')
                        image.alpha_composite(overlay)
                        image = image.convert('RGB')

                    if not p.do_not_save_samples:
                        save_image(image, sample_path, f"{base_count:05}", seeds[i], prompts[i], opts.samples_format, info=infotext())

                    output_images.append(image)
                    base_count += 1

        unwanted_grid_because_of_img_count = len(output_images) < 2 and opts.grid_only_if_multiple
        if (p.prompt_matrix or opts.grid_save) and not p.do_not_save_grid and not unwanted_grid_because_of_img_count:
            return_grid = opts.return_grid

            if p.prompt_matrix:
                grid = image_grid(output_images, p.batch_size, rows=1 << ((len(prompt_matrix_parts)-1)//2))

                try:
                    grid = draw_prompt_matrix(grid, p.width, p.height, prompt_matrix_parts)
                except Exception:
                    import traceback
                    print("Error creating prompt_matrix text:", file=sys.stderr)
                    print(traceback.format_exc(), file=sys.stderr)

                return_grid = True
            else:
                grid = image_grid(output_images, p.batch_size)

            if return_grid:
                output_images.insert(0, grid)

            save_image(grid, p.outpath, f"grid-{grid_count:04}", seed, prompt, opts.grid_format, info=infotext(), short_filename=not opts.grid_extended_filename)
            grid_count += 1

    torch_gc()
    return Processed(output_images, seed, infotext())


class StableDiffusionProcessingTxt2Img(StableDiffusionProcessing):
    sampler = None

    def init(self):
        self.sampler = samplers[self.sampler_index].constructor()

    def sample(self, x, conditioning, unconditional_conditioning):
        samples_ddim = self.sampler.sample(self, x, conditioning, unconditional_conditioning)
        return samples_ddim

def txt2img(prompt: str, negative_prompt: str, steps: int, sampler_index: int, use_GFPGAN: bool, prompt_matrix: bool, n_iter: int, batch_size: int, cfg_scale: float, seed: int, height: int, width: int, code: str):
    outpath = opts.outdir or "outputs/txt2img-samples"

    p = StableDiffusionProcessingTxt2Img(
        outpath=outpath,
        prompt=prompt,
        negative_prompt=negative_prompt,
        seed=seed,
        sampler_index=sampler_index,
        batch_size=batch_size,
        n_iter=n_iter,
        steps=steps,
        cfg_scale=cfg_scale,
        width=width,
        height=height,
        prompt_matrix=prompt_matrix,
        use_GFPGAN=use_GFPGAN
    )

    if code != '' and cmd_opts.allow_code:
        p.do_not_save_grid = True
        p.do_not_save_samples = True

        display_result_data = [[], -1, ""]
        def display(imgs, s=display_result_data[1], i=display_result_data[2]):
            display_result_data[0] = imgs
            display_result_data[1] = s
            display_result_data[2] = i

        from types import ModuleType
        compiled = compile(code, '', 'exec')
        module = ModuleType("testmodule")
        module.__dict__.update(globals())
        module.p = p
        module.display = display
        exec(compiled, module.__dict__)

        processed = Processed(*display_result_data)
    else:
        processed = process_images(p)

    return processed.images, processed.seed, plaintext_to_html(processed.info)


class Flagging(gr.FlaggingCallback):

    def setup(self, components, flagging_dir: str):
        pass

    def flag(self, flag_data, flag_option=None, flag_index=None, username=None):
        import csv

        os.makedirs("log/images", exist_ok=True)

        # those must match the "txt2img" function
        prompt, steps, sampler_index, use_gfpgan, prompt_matrix, n_iter, batch_size, cfg_scale, seed, height, width, code, images, seed, comment = flag_data

        filenames = []

        with open("log/log.csv", "a", encoding="utf8", newline='') as file:
            import time
            import base64

            at_start = file.tell() == 0
            writer = csv.writer(file)
            if at_start:
                writer.writerow(["prompt", "seed", "width", "height", "cfgs", "steps", "filename"])

            filename_base = str(int(time.time() * 1000))
            for i, filedata in enumerate(images):
                filename = "log/images/"+filename_base + ("" if len(images) == 1 else "-"+str(i+1)) + ".png"

                if filedata.startswith("data:image/png;base64,"):
                    filedata = filedata[len("data:image/png;base64,"):]

                with open(filename, "wb") as imgfile:
                    imgfile.write(base64.decodebytes(filedata.encode('utf-8')))

                filenames.append(filename)

            writer.writerow([prompt, seed, width, height, cfg_scale, steps, filenames[0]])

        print("Logged:", filenames[0])

with gr.Blocks(analytics_enabled=False) as txt2img_interface:
    with gr.Row():
        prompt = gr.Textbox(label="Prompt", elem_id="txt2img_prompt", show_label=False, placeholder="Prompt", lines=1)
        negative_prompt = gr.Textbox(label="Negative prompt", elem_id="txt2img_negative_prompt", show_label=False, placeholder="Negative prompt", lines=1, visible=False)
        submit = gr.Button('Generate', variant='primary')

    with gr.Row().style(equal_height=False):
        with gr.Column(variant='panel'):
            steps = gr.Slider(minimum=1, maximum=150, step=1, label="Sampling Steps", value=20)
            sampler_index = gr.Radio(label='Sampling method', elem_id="txt2img_sampling", choices=[x.name for x in samplers], value=samplers[0].name, type="index")

            with gr.Row():
                use_GFPGAN = gr.Checkbox(label='GFPGAN', value=False, visible=have_gfpgan)
                prompt_matrix = gr.Checkbox(label='Prompt matrix', value=False)

            with gr.Row():
                batch_count = gr.Slider(minimum=1, maximum=cmd_opts.max_batch_count, step=1, label='Batch count', value=1)
                batch_size = gr.Slider(minimum=1, maximum=8, step=1, label='Batch size', value=1)

            cfg_scale = gr.Slider(minimum=1.0, maximum=15.0, step=0.5, label='CFG Scale', value=7.0)

            with gr.Group():
                height = gr.Slider(minimum=64, maximum=2048, step=64, label="Height", value=512)
                width = gr.Slider(minimum=64, maximum=2048, step=64, label="Width", value=512)

            seed = gr.Number(label='Seed', value=-1)

            code = gr.Textbox(label="Python script", visible=cmd_opts.allow_code, lines=1)

        with gr.Column(variant='panel'):
            with gr.Group():
                gallery = gr.Gallery(label='Output')
                output_seed = gr.Number(label='Seed', visible=False)
                html_info = gr.HTML()

        txt2img_args = dict(
            fn=wrap_gradio_call(txt2img),
            inputs=[
                prompt,
                negative_prompt,
                steps,
                sampler_index,
                use_GFPGAN,
                prompt_matrix,
                batch_count,
                batch_size,
                cfg_scale,
                seed,
                height,
                width,
                code
            ],
            outputs=[
                gallery,
                output_seed,
                html_info
            ]
        )

        prompt.submit(**txt2img_args)
        submit.click(**txt2img_args)


def get_crop_region(mask, pad=0):
    h, w = mask.shape

    crop_left = 0
    for i in range(w):
        if not (mask[:,i] == 0).all():
            break
        crop_left += 1

    crop_right = 0
    for i in reversed(range(w)):
        if not (mask[:,i] == 0).all():
            break
        crop_right += 1


    crop_top = 0
    for i in range(h):
        if not (mask[i] == 0).all():
            break
        crop_top += 1

    crop_bottom = 0
    for i in reversed(range(h)):
        if not (mask[i] == 0).all():
            break
        crop_bottom += 1

    return (
        int(max(crop_left-pad, 0)),
        int(max(crop_top-pad, 0)),
        int(min(w - crop_right + pad, w)),
        int(min(h - crop_bottom + pad, h))
    )


def fill(image, mask):
    image_mod = Image.new('RGBA', (image.width, image.height))

    image_masked = Image.new('RGBa', (image.width, image.height))
    image_masked.paste(image.convert("RGBA").convert("RGBa"), mask=ImageOps.invert(mask.convert('L')))

    image_masked = image_masked.convert('RGBa')

    for radius, repeats in [(64, 1), (16, 2), (4, 4), (2, 2), (0, 1)]:
        blurred = image_masked.filter(ImageFilter.GaussianBlur(radius)).convert('RGBA')
        for _ in range(repeats):
            image_mod.alpha_composite(blurred)

    return image_mod.convert("RGB")


class StableDiffusionProcessingImg2Img(StableDiffusionProcessing):
    sampler = None

    def __init__(self, init_images=None, resize_mode=0, denoising_strength=0.75, mask=None, mask_blur=4, inpainting_fill=0, inpaint_full_res=True, **kwargs):
        super().__init__(**kwargs)

        self.init_images = init_images
        self.resize_mode: int = resize_mode
        self.denoising_strength: float = denoising_strength
        self.init_latent = None
        self.image_mask = mask
        self.mask_for_overlay = None
        self.mask_blur = mask_blur
        self.inpainting_fill = inpainting_fill
        self.inpaint_full_res = inpaint_full_res
        self.mask = None
        self.nmask = None

    def init(self):
        self.sampler = samplers_for_img2img[self.sampler_index].constructor()
        crop_region = None

        if self.image_mask is not None:
            if self.mask_blur > 0:
                self.image_mask = self.image_mask.filter(ImageFilter.GaussianBlur(self.mask_blur)).convert('L')


            if self.inpaint_full_res:
                self.mask_for_overlay = self.image_mask
                mask = self.image_mask.convert('L')
                crop_region = get_crop_region(np.array(mask), 64)
                x1, y1, x2, y2 = crop_region

                mask = mask.crop(crop_region)
                self.image_mask = resize_image(2, mask, self.width, self.height)
                self.paste_to = (x1, y1, x2-x1, y2-y1)
            else:
                self.image_mask = resize_image(self.resize_mode, self.image_mask, self.width, self.height)
                self.mask_for_overlay = self.image_mask

            self.overlay_images = []


        imgs = []
        for img in self.init_images:
            image = img.convert("RGB")

            if crop_region is None:
                image = resize_image(self.resize_mode, image, self.width, self.height)

            if self.image_mask is not None:
                if self.inpainting_fill != 1:
                    image = fill(image, self.mask_for_overlay)

                image_masked = Image.new('RGBa', (image.width, image.height))
                image_masked.paste(image.convert("RGBA").convert("RGBa"), mask=ImageOps.invert(self.mask_for_overlay.convert('L')))

                self.overlay_images.append(image_masked.convert('RGBA'))

            if crop_region is not None:
                image = image.crop(crop_region)
                image = resize_image(2, image, self.width, self.height)

            image = np.array(image).astype(np.float32) / 255.0
            image = np.moveaxis(image, 2, 0)

            imgs.append(image)

        if len(imgs) == 1:
            batch_images = np.expand_dims(imgs[0], axis=0).repeat(self.batch_size, axis=0)
            if self.overlay_images is not None:
                self.overlay_images = self.overlay_images * self.batch_size
        elif len(imgs) <= self.batch_size:
            self.batch_size = len(imgs)
            batch_images = np.array(imgs)
        else:
            raise RuntimeError(f"bad number of images passed: {len(imgs)}; expecting {self.batch_size} or less")

        image = torch.from_numpy(batch_images)
        image = 2. * image - 1.
        image = image.to(device)

        self.init_latent = sd_model.get_first_stage_encoding(sd_model.encode_first_stage(image))

        if self.image_mask is not None:
            latmask = self.image_mask.convert('RGB').resize((self.init_latent.shape[3], self.init_latent.shape[2]))
            latmask = np.moveaxis(np.array(latmask, dtype=np.float64), 2, 0) / 255
            latmask = latmask[0]
            latmask = np.tile(latmask[None], (4, 1, 1))

            self.mask = torch.asarray(1.0 - latmask).to(device).type(sd_model.dtype)
            self.nmask = torch.asarray(latmask).to(device).type(sd_model.dtype)

    def sample(self, x, conditioning, unconditional_conditioning):
        samples = self.sampler.sample_img2img(self, self.init_latent, x, conditioning, unconditional_conditioning)

        if self.mask is not None:
            samples = samples * self.nmask + self.init_latent * self.mask

        return samples


def img2img(prompt: str, init_img, init_img_with_mask, steps: int, sampler_index: int, mask_blur: int, inpainting_fill: int, use_GFPGAN: bool, prompt_matrix, mode: int, n_iter: int, batch_size: int, cfg_scale: float, denoising_strength: float, seed: int, height: int, width: int, resize_mode: int, upscaler_name: str, upscale_overlap: int, inpaint_full_res: bool):
    outpath = opts.outdir or "outputs/img2img-samples"

    is_classic = mode == 0
    is_inpaint = mode == 1
    is_loopback = mode == 2
    is_upscale = mode == 3

    if is_inpaint:
        image = init_img_with_mask['image']
        mask = init_img_with_mask['mask']
    else:
        image = init_img
        mask = None

    assert 0. <= denoising_strength <= 1., 'can only work with strength in [0.0, 1.0]'

    p = StableDiffusionProcessingImg2Img(
        outpath=outpath,
        prompt=prompt,
        seed=seed,
        sampler_index=sampler_index,
        batch_size=batch_size,
        n_iter=n_iter,
        steps=steps,
        cfg_scale=cfg_scale,
        width=width,
        height=height,
        prompt_matrix=prompt_matrix,
        use_GFPGAN=use_GFPGAN,
        init_images=[image],
        mask=mask,
        mask_blur=mask_blur,
        inpainting_fill=inpainting_fill,
        resize_mode=resize_mode,
        denoising_strength=denoising_strength,
        inpaint_full_res=inpaint_full_res,
        extra_generation_params={"Denoising Strength": denoising_strength}
    )

    if is_loopback:
        output_images, info = None, None
        history = []
        initial_seed = None
        initial_info = None

        for i in range(n_iter):
            p.n_iter = 1
            p.batch_size = 1
            p.do_not_save_grid = True

            processed = process_images(p)

            if initial_seed is None:
                initial_seed = processed.seed
                initial_info = processed.info

            p.init_img = processed.images[0]
            p.seed = processed.seed + 1
            p.denoising_strength = max(p.denoising_strength * 0.95, 0.1)
            history.append(processed.images[0])

        grid_count = len(os.listdir(outpath)) - 1
        grid = image_grid(history, batch_size, rows=1)

        save_image(grid, outpath, f"grid-{grid_count:04}", initial_seed, prompt, opts.grid_format, info=info, short_filename=not opts.grid_extended_filename)

        processed = Processed(history, initial_seed, initial_info)

    elif is_upscale:
        initial_seed = None
        initial_info = None

        upscaler = sd_upscalers[upscaler_name]
        img = upscaler(init_img)

        torch_gc()

        grid = split_grid(img, tile_w=width, tile_h=height, overlap=upscale_overlap)

        p.n_iter = 1
        p.do_not_save_grid = True
        p.do_not_save_samples = True

        work = []
        work_results = []

        for y, h, row in grid.tiles:
            for tiledata in row:
                work.append(tiledata[2])

        batch_count = math.ceil(len(work) / p.batch_size)
        print(f"SD upscaling will process a total of {len(work)} images tiled as {len(grid.tiles[0][2])}x{len(grid.tiles)} in a total of {batch_count} batches.")

        for i in range(batch_count):
            p.init_images = work[i*p.batch_size:(i+1)*p.batch_size]

            processed = process_images(p)

            if initial_seed is None:
                initial_seed = processed.seed
                initial_info = processed.info

            p.seed = processed.seed + 1
            work_results += processed.images

        image_index = 0
        for y, h, row in grid.tiles:
            for tiledata in row:
                tiledata[2] = work_results[image_index]
                image_index += 1

        combined_image = combine_grid(grid)

        grid_count = len(os.listdir(outpath)) - 1
        save_image(combined_image, outpath, f"grid-{grid_count:04}", initial_seed, prompt, opts.grid_format, info=initial_info, short_filename=not opts.grid_extended_filename)

        processed = Processed([combined_image], initial_seed, initial_info)

    else:
        processed = process_images(p)

    return processed.images, processed.seed, plaintext_to_html(processed.info)


sample_img2img = "assets/stable-samples/img2img/sketch-mountains-input.jpg"
sample_img2img = sample_img2img if os.path.exists(sample_img2img) else None


with gr.Blocks(analytics_enabled=False) as img2img_interface:
    with gr.Row():
        prompt = gr.Textbox(label="Prompt", elem_id="img2img_prompt", show_label=False, placeholder="Prompt", lines=1)
        submit = gr.Button('Generate', variant='primary')

    with gr.Row().style(equal_height=False):

        with gr.Column(variant='panel'):
            with gr.Group():
                switch_mode = gr.Radio(label='Mode', elem_id="img2img_mode", choices=['Redraw whole image', 'Inpaint a part of image', 'Loopback', 'SD upscale'], value='Redraw whole image', type="index", show_label=False)
                init_img = gr.Image(label="Image for img2img", source="upload", interactive=True, type="pil")
                init_img_with_mask = gr.Image(label="Image for inpainting with mask", elem_id="img2maskimg", source="upload", interactive=True, type="pil", tool="sketch", visible=False)
                resize_mode = gr.Radio(label="Resize mode", show_label=False, choices=["Just resize", "Crop and resize", "Resize and fill"], type="index", value="Just resize")

            steps = gr.Slider(minimum=1, maximum=150, step=1, label="Sampling Steps", value=20)
            sampler_index = gr.Radio(label='Sampling method', choices=[x.name for x in samplers_for_img2img], value=samplers_for_img2img[0].name, type="index")
            mask_blur = gr.Slider(label='Mask blur', minimum=0, maximum=64, step=1, value=4, visible=False)
            inpainting_fill = gr.Radio(label='Msked content', choices=['fill', 'original', 'latent noise', 'latent nothing'], value='fill', type="index", visible=False)

            with gr.Row():
                use_GFPGAN = gr.Checkbox(label='GFPGAN', value=False, visible=have_gfpgan)
                prompt_matrix = gr.Checkbox(label='Prompt matrix', value=False)
                inpaint_full_res = gr.Checkbox(label='Inpaint at full resolution', value=True, visible=False)

            with gr.Row():
                sd_upscale_upscaler_name = gr.Radio(label='Upscaler', choices=list(sd_upscalers.keys()), value="RealESRGAN")
                sd_upscale_overlap = gr.Slider(minimum=0, maximum=256, step=16, label='Tile overlap', value=64)

            with gr.Row():
                batch_count = gr.Slider(minimum=1, maximum=cmd_opts.max_batch_count, step=1, label='Batch count', value=1)
                batch_size = gr.Slider(minimum=1, maximum=8, step=1, label='Batch size', value=1)

            with gr.Group():
                cfg_scale = gr.Slider(minimum=1.0, maximum=15.0, step=0.5, label='CFG Scale', value=7.0)
                denoising_strength = gr.Slider(minimum=0.0, maximum=1.0, step=0.01, label='Denoising Strength', value=0.75)

            with gr.Group():
                height = gr.Slider(minimum=64, maximum=2048, step=64, label="Height", value=512)
                width = gr.Slider(minimum=64, maximum=2048, step=64, label="Width", value=512)

            seed = gr.Number(label='Seed', value=-1)

        with gr.Column(variant='panel'):
            with gr.Group():
                gallery = gr.Gallery(label='Output')
                output_seed = gr.Number(label='Seed', visible=False)
                html_info = gr.HTML()

        def apply_mode(mode):
            is_classic = mode == 0
            is_inpaint = mode == 1
            is_loopback = mode == 2
            is_upscale = mode == 3

            return {
                init_img: gr.update(visible=not is_inpaint),
                init_img_with_mask: gr.update(visible=is_inpaint),
                mask_blur: gr.update(visible=is_inpaint),
                inpainting_fill: gr.update(visible=is_inpaint),
                prompt_matrix: gr.update(visible=is_classic),
                batch_count: gr.update(visible=not is_upscale),
                batch_size: gr.update(visible=not is_loopback),
                sd_upscale_upscaler_name: gr.update(visible=is_upscale),
                sd_upscale_overlap: gr.update(visible=is_upscale),
                inpaint_full_res: gr.update(visible=is_inpaint),
            }

        switch_mode.change(
            apply_mode,
            inputs=[switch_mode],
            outputs=[
                init_img,
                init_img_with_mask,
                mask_blur,
                inpainting_fill,
                prompt_matrix,
                batch_count,
                batch_size,
                sd_upscale_upscaler_name,
                sd_upscale_overlap,
                inpaint_full_res,
            ]
        )

        img2img_args = dict(
            fn=wrap_gradio_call(img2img),
            inputs=[
                prompt,
                init_img,
                init_img_with_mask,
                steps,
                sampler_index,
                mask_blur,
                inpainting_fill,
                use_GFPGAN,
                prompt_matrix,
                switch_mode,
                batch_count,
                batch_size,
                cfg_scale,
                denoising_strength,
                seed,
                height,
                width,
                resize_mode,
                sd_upscale_upscaler_name,
                sd_upscale_overlap,
                inpaint_full_res,
            ],
            outputs=[
                gallery,
                output_seed,
                html_info
            ]
        )

        prompt.submit(**img2img_args)
        submit.click(**img2img_args)


def upscale_with_realesrgan(image, RealESRGAN_upscaling, RealESRGAN_model_index):
    info = realesrgan_models[RealESRGAN_model_index]

    model = info.model()
    upsampler = RealESRGANer(
        scale=info.netscale,
        model_path=info.location,
        model=model,
        half=True
    )

    upsampled = upsampler.enhance(np.array(image), outscale=RealESRGAN_upscaling)[0]

    image = Image.fromarray(upsampled)
    return image


def run_extras(image, GFPGAN_strength, RealESRGAN_upscaling, RealESRGAN_model_index):
    torch_gc()

    image = image.convert("RGB")

    outpath = opts.outdir or "outputs/extras-samples"

    if have_gfpgan is not None and GFPGAN_strength > 0:
        gfpgan_model = gfpgan()

        restored_img = gfpgan_fix_faces(gfpgan_model, np.array(image, dtype=np.uint8))
        res = Image.fromarray(restored_img)

        if GFPGAN_strength < 1.0:
            res = Image.blend(image, res, GFPGAN_strength)

        image = res

    if have_realesrgan and RealESRGAN_upscaling != 1.0:
        image = upscale_with_realesrgan(image, RealESRGAN_upscaling, RealESRGAN_model_index)

    os.makedirs(outpath, exist_ok=True)
    base_count = len(os.listdir(outpath))
    save_image(image, outpath, f"{base_count:05}", None, '', opts.samples_format, short_filename=True)

    return image, 0, ''


extras_interface = gr.Interface(
    wrap_gradio_call(run_extras),
    inputs=[
        gr.Image(label="Source", source="upload", interactive=True, type="pil"),
        gr.Slider(minimum=0.0, maximum=1.0, step=0.001, label="GFPGAN strength", value=1, interactive=have_gfpgan),
        gr.Slider(minimum=1.0, maximum=4.0, step=0.05, label="Real-ESRGAN upscaling", value=2, interactive=have_realesrgan),
        gr.Radio(label='Real-ESRGAN model', choices=[x.name for x in realesrgan_models], value=realesrgan_models[0].name, type="index", interactive=have_realesrgan),
    ],
    outputs=[
        gr.Image(label="Result"),
        gr.Number(label='Seed', visible=False),
        gr.HTML(),
    ],
    allow_flagging="never",
    analytics_enabled=False,
)


def run_pnginfo(image):
    info = ''
    for key, text in image.info.items():
        info += f"""
<div>
<p><b>{plaintext_to_html(str(key))}</b></p>
<p>{plaintext_to_html(str(text))}</p>
</div>
""".strip()+"\n"

    if len(info) == 0:
        message = "Nothing found in the image."
        info = f"<div><p>{message}<p></div>"

    return [info]


pnginfo_interface = gr.Interface(
    wrap_gradio_call(run_pnginfo),
    inputs=[
        gr.Image(label="Source", source="upload", interactive=True, type="pil"),
    ],
    outputs=[
        gr.HTML(),
    ],
    allow_flagging="never",
    analytics_enabled=False,
)


opts = Options()
if os.path.exists(config_filename):
    opts.load(config_filename)


def run_settings(*args):
    up = []

    for key, value, comp in zip(opts.data_labels.keys(), args, settings_interface.input_components):
        opts.data[key] = value
        up.append(comp.update(value=value))

    opts.save(config_filename)

    return 'Settings saved.', ''


def create_setting_component(key):
    def fun():
        return opts.data[key] if key in opts.data else opts.data_labels[key].default

    info = opts.data_labels[key]
    t = type(info.default)

    if info.component is not None:
        item = info.component(label=info.label, value=fun, **(info.component_args or {}))
    elif t == str:
        item = gr.Textbox(label=info.label, value=fun, lines=1)
    elif t == int:
        item = gr.Number(label=info.label, value=fun)
    elif t == bool:
        item = gr.Checkbox(label=info.label, value=fun)
    else:
        raise Exception(f'bad options item type: {str(t)} for key {key}')

    return item


settings_interface = gr.Interface(
    run_settings,
    inputs=[create_setting_component(key) for key in opts.data_labels.keys()],
    outputs=[
        gr.Textbox(label='Result'),
        gr.HTML(),
    ],
    title=None,
    description=None,
    allow_flagging="never",
    analytics_enabled=False,
)

interfaces = [
    (txt2img_interface, "txt2img"),
    (img2img_interface, "img2img"),
    (extras_interface, "Extras"),
    (pnginfo_interface, "PNG Info"),
    (settings_interface, "Settings"),
]

try:
    # this silences the annoying "Some weights of the model checkpoint were not used when initializing..." message at start.

    from transformers import logging

    logging.set_verbosity_error()
except Exception:
    pass

sd_config = OmegaConf.load(cmd_opts.config)
sd_model = load_model_from_config(sd_config, cmd_opts.ckpt)
sd_model = (sd_model if cmd_opts.no_half else sd_model.half())

if not cmd_opts.lowvram:
    sd_model = sd_model.to(device)
else:
    setup_for_low_vram(sd_model)

model_hijack = StableDiffusionModelHijack()
model_hijack.hijack(sd_model)

with open(os.path.join(script_path, "style.css"), "r", encoding="utf8") as file:
    css = file.read()

if not cmd_opts.no_progressbar_hiding:
    css += css_hide_progressbar

with open(os.path.join(script_path, "script.js"), "r", encoding="utf8") as file:
    javascript = file.read()


# make the program just exit at ctrl+c without waiting for anything
def sigint_handler(signal, frame):
    print('Interrupted')
    os._exit(0)


signal.signal(signal.SIGINT, sigint_handler)

demo = gr.TabbedInterface(
    interface_list=[x[0] for x in interfaces],
    tab_names=[x[1] for x in interfaces],
    analytics_enabled=False,
    css=css,
)


def inject_gradio_html(javascript):
    import gradio.routes

    def template_response(*args, **kwargs):
        res = gradio_routes_templates_response(*args, **kwargs)
        res.body = res.body.replace(b'</head>', f'<script>{javascript}</script></head>'.encode("utf8"))
        res.init_headers()
        return res

    gradio_routes_templates_response = gradio.routes.templates.TemplateResponse
    gradio.routes.templates.TemplateResponse = template_response


inject_gradio_html(javascript)

demo.queue(concurrency_count=1)
demo.launch()