app.py

import gradio as gr
import spaces
import torch
from diffusers import AutoencoderKL, TCDScheduler
from diffusers.models.model_loading_utils import load_state_dict
# Removed: from gradio_imageslider import ImageSlider
from huggingface_hub import hf_hub_download

from controlnet_union import ControlNetModel_Union
from pipeline_fill_sd_xl import StableDiffusionXLFillPipeline

from PIL import Image, ImageDraw
import numpy as np

# --- Model Loading (unchanged) ---
config_file = hf_hub_download(
    "xinsir/controlnet-union-sdxl-1.0",
    filename="config_promax.json",
)

config = ControlNetModel_Union.load_config(config_file)
controlnet_model = ControlNetModel_Union.from_config(config)
model_file = hf_hub_download(
    "xinsir/controlnet-union-sdxl-1.0",
    filename="diffusion_pytorch_model_promax.safetensors",
)

sstate_dict = load_state_dict(model_file)
model, _, _, _, _ = ControlNetModel_Union._load_pretrained_model(
    controlnet_model, sstate_dict, model_file, "xinsir/controlnet-union-sdxl-1.0"
)
model.to(device="cuda", dtype=torch.float16)
#----------------------

vae = AutoencoderKL.from_pretrained(
    "madebyollin/sdxl-vae-fp16-fix", torch_dtype=torch.float16
).to("cuda")

pipe = StableDiffusionXLFillPipeline.from_pretrained(
    "SG161222/RealVisXL_V5.0_Lightning",
    torch_dtype=torch.float16,
    vae=vae,
    controlnet=model,
    variant="fp16",
).to("cuda")

pipe.scheduler = TCDScheduler.from_config(pipe.scheduler.config)

# --- Helper Functions (unchanged, except infer) ---

def can_expand(source_width, source_height, target_width, target_height, alignment):
    """Checks if the image can be expanded based on the alignment."""
    if alignment in ("Left", "Right") and source_width >= target_width:
        return False
    if alignment in ("Top", "Bottom") and source_height >= target_height:
        return False
    return True

def prepare_image_and_mask(image, width, height, overlap_percentage, resize_option, custom_resize_percentage, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom):
    target_size = (width, height)

    # Calculate the scaling factor to fit the image within the target size
    scale_factor = min(target_size[0] / image.width, target_size[1] / image.height)
    new_width = int(image.width * scale_factor)
    new_height = int(image.height * scale_factor)

    # Resize the source image to fit within target size
    source = image.resize((new_width, new_height), Image.LANCZOS)

    # Apply resize option using percentages
    if resize_option == "Full":
        resize_percentage = 100
    elif resize_option == "50%":
        resize_percentage = 50
    elif resize_option == "33%":
        resize_percentage = 33
    elif resize_option == "25%":
        resize_percentage = 25
    else:  # Custom
        resize_percentage = custom_resize_percentage

    # Calculate new dimensions based on percentage
    resize_factor = resize_percentage / 100
    new_width = int(source.width * resize_factor)
    new_height = int(source.height * resize_factor)

    # Ensure minimum size of 64 pixels
    new_width = max(new_width, 64)
    new_height = max(new_height, 64)

    # Resize the image
    source = source.resize((new_width, new_height), Image.LANCZOS)

    # Calculate the overlap in pixels based on the percentage
    overlap_x = int(new_width * (overlap_percentage / 100))
    overlap_y = int(new_height * (overlap_percentage / 100))

    # Ensure minimum overlap of 1 pixel
    overlap_x = max(overlap_x, 1)
    overlap_y = max(overlap_y, 1)

    # Calculate margins based on alignment
    if alignment == "Middle":
        margin_x = (target_size[0] - new_width) // 2
        margin_y = (target_size[1] - new_height) // 2
    elif alignment == "Left":
        margin_x = 0
        margin_y = (target_size[1] - new_height) // 2
    elif alignment == "Right":
        margin_x = target_size[0] - new_width
        margin_y = (target_size[1] - new_height) // 2
    elif alignment == "Top":
        margin_x = (target_size[0] - new_width) // 2
        margin_y = 0
    elif alignment == "Bottom":
        margin_x = (target_size[0] - new_width) // 2
        margin_y = target_size[1] - new_height

    # Adjust margins to eliminate gaps
    margin_x = max(0, min(margin_x, target_size[0] - new_width))
    margin_y = max(0, min(margin_y, target_size[1] - new_height))

    # Create a new background image and paste the resized source image
    background = Image.new('RGB', target_size, (255, 255, 255))
    background.paste(source, (margin_x, margin_y))

    # Create the mask
    mask = Image.new('L', target_size, 255)
    mask_draw = ImageDraw.Draw(mask)

    # Calculate overlap areas
    white_gaps_patch = 2

    left_overlap = margin_x + overlap_x if overlap_left else margin_x + white_gaps_patch
    right_overlap = margin_x + new_width - overlap_x if overlap_right else margin_x + new_width - white_gaps_patch
    top_overlap = margin_y + overlap_y if overlap_top else margin_y + white_gaps_patch
    bottom_overlap = margin_y + new_height - overlap_y if overlap_bottom else margin_y + new_height - white_gaps_patch

    if alignment == "Left":
        left_overlap = margin_x + overlap_x if overlap_left else margin_x
    elif alignment == "Right":
        right_overlap = margin_x + new_width - overlap_x if overlap_right else margin_x + new_width
    elif alignment == "Top":
        top_overlap = margin_y + overlap_y if overlap_top else margin_y
    elif alignment == "Bottom":
        bottom_overlap = margin_y + new_height - overlap_y if overlap_bottom else margin_y + new_height


    # Draw the mask
    mask_draw.rectangle([
        (left_overlap, top_overlap),
        (right_overlap, bottom_overlap)
    ], fill=0)

    return background, mask

def preview_image_and_mask(image, width, height, overlap_percentage, resize_option, custom_resize_percentage, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom):
    background, mask = prepare_image_and_mask(image, width, height, overlap_percentage, resize_option, custom_resize_percentage, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom)

    # Create a preview image showing the mask
    preview = background.copy().convert('RGBA')

    # Create a semi-transparent red overlay
    red_overlay = Image.new('RGBA', background.size, (255, 0, 0, 64))  # Reduced alpha to 64 (25% opacity)

    # Convert black pixels in the mask to semi-transparent red
    red_mask = Image.new('RGBA', background.size, (0, 0, 0, 0))
    red_mask.paste(red_overlay, (0, 0), mask)

    # Overlay the red mask on the background
    preview = Image.alpha_composite(preview, red_mask)

    return preview

@spaces.GPU(duration=24)
def infer(image, width, height, overlap_percentage, num_inference_steps, resize_option, custom_resize_percentage, prompt_input, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom):
    background, mask = prepare_image_and_mask(image, width, height, overlap_percentage, resize_option, custom_resize_percentage, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom)

    if not can_expand(background.width, background.height, width, height, alignment):
        alignment = "Middle" # Default to middle if expansion not possible with current alignment

    cnet_image = background.copy()
    # Prepare the controlnet input image (original image with blacked-out mask area)
    # Note: The pipeline expects the original image content where the mask is 0 (black)
    # and the area to be filled where the mask is 255 (white).
    # However, the current pipeline_fill_sd_xl seems to use the mask differently internally.
    # Let's prepare the input image as per the original logic, which pastes black over the masked area.
    black_fill = Image.new('RGB', cnet_image.size, (0, 0, 0))
    # Invert the mask: white (255) becomes the area to keep, black (0) the area to fill
    inverted_mask = Image.eval(mask, lambda x: 255 - x)
    cnet_image.paste(black_fill, (0, 0), inverted_mask) # Paste black where the inverted mask is white (original mask was 0)


    final_prompt = f"{prompt_input} , high quality, 4k"

    (
        prompt_embeds,
        negative_prompt_embeds,
        pooled_prompt_embeds,
        negative_pooled_prompt_embeds,
    ) = pipe.encode_prompt(final_prompt, "cuda", True)

    # Generate the image content for the masked area
    # The pipeline yields the generated content for the masked area
    # We only need the final result from the generator
    generated_content = None
    for res in pipe(
        prompt_embeds=prompt_embeds,
        negative_prompt_embeds=negative_prompt_embeds,
        pooled_prompt_embeds=pooled_prompt_embeds,
        negative_pooled_prompt_embeds=negative_pooled_prompt_embeds,
        image=cnet_image, # Pass the image with blacked-out area
        mask_image=mask, # Pass the mask (white = area to fill)
        num_inference_steps=num_inference_steps
    ):
        generated_content = res # Keep updating until the last step

    # The pipeline directly returns the final composite image in recent versions
    # If it returns only the filled part, we need to composite it
    # Let's assume the pipeline returns the final composited image based on its name "FillPipeline"
    final_image = generated_content

    # --- OLD compositing logic (keep commented in case pipeline behavior differs) ---
    # # Convert generated content to RGBA to handle potential transparency
    # generated_content = generated_content.convert("RGBA")
    # # Create the final composite image by pasting the generated content onto the background
    # final_image = background.copy().convert("RGBA")
    # # Paste the generated content using the original mask (white area = where to paste)
    # final_image.paste(generated_content, (0, 0), mask)
    # final_image = final_image.convert("RGB") # Convert back to RGB if needed

    # Yield only the final composited image
    yield final_image


def clear_result():
    """Clears the result Image."""
    return gr.update(value=None)

def preload_presets(target_ratio, ui_width, ui_height):
    """Updates the width and height sliders based on the selected aspect ratio."""
    if target_ratio == "9:16":
        changed_width = 720
        changed_height = 1280
        return changed_width, changed_height, gr.update()
    elif target_ratio == "16:9":
        changed_width = 1280
        changed_height = 720
        return changed_width, changed_height, gr.update()
    elif target_ratio == "1:1":
        changed_width = 1024
        changed_height = 1024
        return changed_width, changed_height, gr.update()
    elif target_ratio == "Custom":
        # When switching to custom, keep current slider values but open the accordion
        return ui_width, ui_height, gr.update(open=True)

def select_the_right_preset(user_width, user_height):
    if user_width == 720 and user_height == 1280:
        return "9:16"
    elif user_width == 1280 and user_height == 720:
        return "16:9"
    elif user_width == 1024 and user_height == 1024:
        return "1:1"
    else:
        return "Custom"

def toggle_custom_resize_slider(resize_option):
    return gr.update(visible=(resize_option == "Custom"))

def update_history(new_image, history):
    """Updates the history gallery with the new image."""
    if history is None:
        history = []
    # Ensure new_image is a PIL Image before inserting
    if isinstance(new_image, Image.Image):
        history.insert(0, new_image)
    # Handle cases where the input might be None or not an image (e.g., during clearing)
    elif new_image is not None:
        print(f"Warning: Attempted to add non-image type to history: {type(new_image)}")
    return history


# --- Gradio UI ---
css = """
.gradio-container {
    width: 1200px !important;
}
h1 { text-align: center; }
footer { visibility: hidden; }
"""

title = """<h1 align="center">Diffusers Image Outpaint Lightning</h1>
"""

with gr.Blocks(css=css) as demo:
    with gr.Column():
        gr.HTML(title)

        with gr.Row():
            with gr.Column():
                input_image = gr.Image(
                    type="pil",
                    label="Input Image"
                )

                with gr.Row():
                    with gr.Column(scale=2):
                        prompt_input = gr.Textbox(label="Prompt (Optional)")
                    with gr.Column(scale=1):
                        run_button = gr.Button("Generate")

                with gr.Row():
                    target_ratio = gr.Radio(
                        label="Expected Ratio",
                        choices=["9:16", "16:9", "1:1", "Custom"],
                        value="9:16",
                        scale=2
                    )

                    alignment_dropdown = gr.Dropdown(
                        choices=["Middle", "Left", "Right", "Top", "Bottom"],
                        value="Middle",
                        label="Alignment"
                    )

                with gr.Accordion(label="Advanced settings", open=False) as settings_panel:
                    with gr.Column():
                        with gr.Row():
                            width_slider = gr.Slider(
                                label="Target Width",
                                minimum=720,
                                maximum=1536,
                                step=8,
                                value=720,  # Default for 9:16
                            )
                            height_slider = gr.Slider(
                                label="Target Height",
                                minimum=720,
                                maximum=1536,
                                step=8,
                                value=1280, # Default for 9:16
                            )

                        num_inference_steps = gr.Slider(label="Steps", minimum=4, maximum=12, step=1, value=8)
                        with gr.Group():
                            overlap_percentage = gr.Slider(
                                label="Mask overlap (%)",
                                minimum=1,
                                maximum=50,
                                value=10,
                                step=1
                            )
                            with gr.Row():
                                overlap_top = gr.Checkbox(label="Overlap Top", value=True)
                                overlap_right = gr.Checkbox(label="Overlap Right", value=True)
                            with gr.Row(): # Changed nesting for better layout
                                overlap_left = gr.Checkbox(label="Overlap Left", value=True)
                                overlap_bottom = gr.Checkbox(label="Overlap Bottom", value=True)
                        with gr.Row():
                            resize_option = gr.Radio(
                                label="Resize input image",
                                choices=["Full", "50%", "33%", "25%", "Custom"],
                                value="Full"
                            )
                            custom_resize_percentage = gr.Slider(
                                label="Custom resize (%)",
                                minimum=1,
                                maximum=100,
                                step=1,
                                value=50,
                                visible=False
                            )

                        with gr.Column(): # Keep preview button separate
                            preview_button = gr.Button("Preview alignment and mask")


                gr.Examples(
                    examples=[
                        ["./examples/example_1.webp", 1280, 720, "Middle"],
                        ["./examples/example_2.jpg", 1440, 810, "Left"],
                        ["./examples/example_3.jpg", 1024, 1024, "Top"],
                        ["./examples/example_3.jpg", 1024, 1024, "Bottom"],
                    ],
                    inputs=[input_image, width_slider, height_slider, alignment_dropdown],
                     # Ensure examples don't try to set output components directly
                     # outputs=[result], # Remove output mapping from examples
                     # fn=infer, # Don't run infer on example click, just load inputs
                )


            with gr.Column():
                # *** MODIFICATION: Changed ImageSlider to Image ***
                result = gr.Image(label="Generated Image", interactive=False, type="pil")
                use_as_input_button = gr.Button("Use as Input Image", visible=False)

                history_gallery = gr.Gallery(label="History", columns=6, object_fit="contain", interactive=False, type="pil")
                preview_image = gr.Image(label="Preview", type="pil") # Ensure preview is also PIL

    # --- Event Handlers ---

    def use_output_as_input(output_image):
        """Sets the generated output as the new input image."""
        # *** MODIFICATION: Access the image directly, not output_image[1] ***
        return gr.update(value=output_image)

    use_as_input_button.click(
        fn=use_output_as_input,
        inputs=[result], # Input is the single result image
        outputs=[input_image]
    )

    target_ratio.change(
        fn=preload_presets,
        inputs=[target_ratio, width_slider, height_slider],
        outputs=[width_slider, height_slider, settings_panel],
        queue=False
    )

    # Link sliders change to update the ratio selection to "Custom"
    width_slider.change(
        fn=select_the_right_preset,
        inputs=[width_slider, height_slider],
        outputs=[target_ratio],
        queue=False
    ).then(
        fn=lambda: gr.update(open=True), # Also open accordion on slider change
        inputs=None,
        outputs=settings_panel,
        queue=False
    )


    height_slider.change(
        fn=select_the_right_preset,
        inputs=[width_slider, height_slider],
        outputs=[target_ratio],
        queue=False
    ).then(
        fn=lambda: gr.update(open=True), # Also open accordion on slider change
        inputs=None,
        outputs=settings_panel,
        queue=False
    )


    resize_option.change(
        fn=toggle_custom_resize_slider,
        inputs=[resize_option],
        outputs=[custom_resize_percentage],
        queue=False
    )

    # Combine run logic for Button and Textbox submission
    run_inputs = [
        input_image, width_slider, height_slider, overlap_percentage, num_inference_steps,
        resize_option, custom_resize_percentage, prompt_input, alignment_dropdown,
        overlap_left, overlap_right, overlap_top, overlap_bottom
    ]

    def run_generation(img, w, h, ov_perc, steps, res_opt, cust_res_perc, prompt, align, ov_l, ov_r, ov_t, ov_b, history):
        # The infer function is a generator, we need to iterate to get the final value
        final_image = None
        for res_img in infer(img, w, h, ov_perc, steps, res_opt, cust_res_perc, prompt, align, ov_l, ov_r, ov_t, ov_b):
            final_image = res_img
        
        # Update history with the final image
        updated_history = update_history(final_image, history)
        
        # Return the final image for the result component and the updated history
        return final_image, updated_history, gr.update(visible=True) # Also make button visible


    run_button.click(
        fn=clear_result, # First clear the previous result
        inputs=None,
        outputs=result,
        queue=False # Clearing should be fast
    ).then(
        fn=run_generation, # Then run the generation and history update
        inputs=run_inputs + [history_gallery], # Pass current history
        outputs=[result, history_gallery, use_as_input_button], # Update result, history, and button visibility
    )

    prompt_input.submit(
        fn=clear_result, # First clear the previous result
        inputs=None,
        outputs=result,
        queue=False # Clearing should be fast
    ).then(
        fn=run_generation, # Then run the generation and history update
        inputs=run_inputs + [history_gallery], # Pass current history
        outputs=[result, history_gallery, use_as_input_button], # Update result, history, and button visibility
    )


    preview_button.click(
        fn=preview_image_and_mask,
        inputs=[input_image, width_slider, height_slider, overlap_percentage, resize_option, custom_resize_percentage, alignment_dropdown,
                overlap_left, overlap_right, overlap_top, overlap_bottom],
        outputs=preview_image,
        queue=False # Preview should be fast
    )

# Launch the demo
demo.queue(max_size=20).launch(share=False, ssr_mode=False, show_error=True)