app.py

import numpy as np
import pandas as pd
from PIL import Image
from collections import defaultdict

import streamlit as st
from streamlit_drawable_canvas import st_canvas

import matplotlib as mpl

from model import device, segment_image, inpaint


# define utils and helpers
def closest_number(n, m=8):
    """ Obtains closest number to n that is divisble by m """
    return int(n/m) * m


def get_mask_from_rectangles(image, mask, height, width, drawing_mode='rect'):
    # Create a canvas component
    canvas_result = st_canvas(
        fill_color="rgba(255, 165, 0, 0.3)",  
        stroke_width=2,
        stroke_color="#000000", 
        background_image=image,
        update_streamlit=True,
        height=height,
        width=width,
        drawing_mode=drawing_mode,
        point_display_radius=5,
        key="canvas",
    )

    # get selections from mask
    if canvas_result.json_data is not None:
        objects = pd.json_normalize(canvas_result.json_data["objects"])
        for col in objects.select_dtypes(include=["object"]).columns:
            objects[col] = objects[col].astype("str")

        if len(objects) > 0:
            left_coords = objects.left.to_numpy()
            top_coords = objects.top.to_numpy()
            right_coords = left_coords + objects.width.to_numpy()
            bottom_coords = top_coords + objects.height.to_numpy()

            # add selections to mask
            for (left, top, right, bottom) in zip(left_coords, top_coords, right_coords, bottom_coords):
                cropped = image.crop((left, top, right, bottom))
                st.image(cropped)
                mask[top:bottom, left:right] = 255

            st.header("Mask Created!")
            st.image(mask)

    return mask


def get_mask(image, edit_method, height, width):
    mask = np.zeros((height, width), dtype=np.uint8)

    if edit_method == "AutoSegment Area":

        # get displayable segmented image
        seg_prediction, segment_labels = segment_image(image)
        seg = seg_prediction['segmentation'].cpu().numpy()
        viridis = mpl.colormaps.get_cmap('viridis').resampled(np.max(seg))
        seg_image = Image.fromarray(np.uint8(viridis(seg)*255))

        st.image(seg_image)

        # prompt user to select valid labels to edit
        seg_selections = st.multiselect("Choose segments", zip(segment_labels.keys(), segment_labels.values()))
        if seg_selections:
            tgts = []
            for s in seg_selections:
                tgts.append(s[0])

            mask = Image.fromarray(np.array([(seg == t) for t in tgts]).sum(axis=0).astype(np.uint8)*255)
            st.header("Mask Created!")
            st.image(mask)

    elif edit_method == "Draw Custom Area":
        mask = get_mask_from_rectangles(image, mask, height, width)


    return mask



if __name__ == '__main__':
    
    st.title("Stable Edit")
    st.title("Edit your photos with Stable Diffusion!")

    st.write(f"Device found: {device}")

    sf = st.text_input("Please enter resizing scale factor to downsize image (default=2)", value="2")
    try: 
        sf = int(sf)
    except:
        sf.write("Error with input scale factor, setting to default value of 2, please re-enter above to change it")
        sf = 2

    # upload image
    filename = st.file_uploader("upload an image")

    if filename:
        image = Image.open(filename)

        width, height = image.size
        width, height = closest_number(width/sf), closest_number(height/sf)
        image = image.resize((width, height))

        st.image(image)
        # st.write(f"{width} {height}")

        # Select an editing method
        edit_method = st.selectbox("Select Edit Method", ("AutoSegment Area", "Draw Custom Area"))

        if edit_method:
            mask = get_mask(image, edit_method, height, width)

            # get inpainted images
            prompt = st.text_input("Please enter prompt for image inpainting", value="")

            if prompt: #  and isinstance(seed, int):
                st.write("Inpainting Images, patience is a virtue and this will take a while to run on a CPU :)")
                images = inpaint(image, mask, width, height, prompt=prompt, seed=0, guidance_scale=17.5, num_samples=3)

                # display all images
                st.write("Original Image")
                st.image(image)
                for i, img in enumerate(images, 1):
                    st.write(f"result: {i}")
                    st.image(img)