app.py

import gradio as gr
import spaces
import torch
from diffusers import FluxKontextPipeline
from diffusers.utils import load_image
from PIL import Image
import os

# Style dictionary
style_type_lora_dict = {
    "3D_Chibi": "3D_Chibi_lora_weights.safetensors",
    "American_Cartoon": "American_Cartoon_lora_weights.safetensors",
    "Chinese_Ink": "Chinese_Ink_lora_weights.safetensors",
    "Clay_Toy": "Clay_Toy_lora_weights.safetensors",
    "Fabric": "Fabric_lora_weights.safetensors",
    "Ghibli": "Ghibli_lora_weights.safetensors",
    "Irasutoya": "Irasutoya_lora_weights.safetensors",
    "Jojo": "Jojo_lora_weights.safetensors",
    "Oil_Painting": "Oil_Painting_lora_weights.safetensors",
    "Pixel": "Pixel_lora_weights.safetensors",
    "Snoopy": "Snoopy_lora_weights.safetensors",
    "Poly": "Poly_lora_weights.safetensors",
    "LEGO": "LEGO_lora_weights.safetensors",
    "Origami": "Origami_lora_weights.safetensors",
    "Pop_Art": "Pop_Art_lora_weights.safetensors",
    "Van_Gogh": "Van_Gogh_lora_weights.safetensors",
    "Paper_Cutting": "Paper_Cutting_lora_weights.safetensors",
    "Line": "Line_lora_weights.safetensors",
    "Vector": "Vector_lora_weights.safetensors",
    "Picasso": "Picasso_lora_weights.safetensors",
    "Macaron": "Macaron_lora_weights.safetensors",
    "Rick_Morty": "Rick_Morty_lora_weights.safetensors"
}

# Style descriptions
style_descriptions = {
    "3D_Chibi": "Cute, miniature 3D character style with big heads",
    "American_Cartoon": "Classic American animation style",
    "Chinese_Ink": "Traditional Chinese ink painting aesthetic",
    "Clay_Toy": "Playful clay/plasticine toy appearance",
    "Fabric": "Soft, textile-like rendering",
    "Ghibli": "Studio Ghibli's distinctive anime style",
    "Irasutoya": "Simple, flat Japanese illustration style",
    "Jojo": "JoJo's Bizarre Adventure manga style",
    "Oil_Painting": "Classic oil painting texture and strokes",
    "Pixel": "Retro pixel art style",
    "Snoopy": "Peanuts comic strip style",
    "Poly": "Low-poly 3D geometric style",
    "LEGO": "LEGO brick construction style",
    "Origami": "Paper folding art style",
    "Pop_Art": "Bold, colorful pop art style",
    "Van_Gogh": "Van Gogh's expressive brushstroke style",
    "Paper_Cutting": "Paper cut-out art style",
    "Line": "Clean line art/sketch style",
    "Vector": "Clean vector graphics style",
    "Picasso": "Cubist art style inspired by Picasso",
    "Macaron": "Soft, pastel macaron-like style",
    "Rick_Morty": "Rick and Morty cartoon style"
}

# Mapping for thumbnail files
thumbnail_mapping = {
    "3D_Chibi": "3D_Chibi.webp",
    "American_Cartoon": "american_cartoon.webp",
    "Chinese_Ink": "chinese_ink.webp",
    "Clay_Toy": "clay_toy.webp",
    "Fabric": "fabric.webp",
    "Ghibli": "ghibli.webp",
    "Irasutoya": "Irasutoya.webp",
    "Jojo": "jojo.webp",
    "Oil_Painting": "oil_painting.webp",
    "Pixel": "pixel.webp",
    "Snoopy": "snoopy.webp",
    "Poly": "poly.webp",
    "LEGO": "LEGO.webp",
    "Origami": "origami.webp",
    "Pop_Art": "pop-art.webp",
    "Van_Gogh": "van_gogh.webp",
    "Paper_Cutting": "Paper_Cutting.webp",
    "Line": "line.webp",
    "Vector": "vector.webp",
    "Picasso": "picasso.webp",
    "Macaron": "Macaron.webp",
    "Rick_Morty": "Rick_Morty.webp"
}

# Initialize pipeline globally
pipeline = None
pipeline_loaded = False

def load_pipeline():
    global pipeline, pipeline_loaded
    if pipeline is None:
        print("Loading FLUX.1-Kontext-dev model...")
        # HF_TOKEN 자동 감지
        token = os.getenv("HF_TOKEN", True)
        
        pipeline = FluxKontextPipeline.from_pretrained(
            "black-forest-labs/FLUX.1-Kontext-dev", 
            torch_dtype=torch.bfloat16,
            use_auth_token=token
        )
        pipeline_loaded = True
    return pipeline

@spaces.GPU(duration=120)
def style_transfer(input_image, style_name, prompt_suffix, num_inference_steps, guidance_scale, seed):
    """
    Apply style transfer to the input image using selected style
    """
    if input_image is None:
        gr.Warning("Please upload an image first!")
        return None
    
    try:
        # Load pipeline and move to GPU
        pipe = load_pipeline()
        pipe = pipe.to('cuda')
        
        # Enable memory efficient settings
        pipe.enable_model_cpu_offload()
        
        # Set seed for reproducibility
        generator = None
        if seed > 0:
            generator = torch.Generator(device="cuda").manual_seed(seed)
        
        # Process input image
        if isinstance(input_image, str):
            image = load_image(input_image)
        else:
            image = input_image
        
        # Ensure RGB and resize to 1024x1024
        image = image.convert("RGB").resize((1024, 1024), Image.Resampling.LANCZOS)
        
        # Load the selected LoRA
        lora_filename = style_type_lora_dict[style_name]
        
        # Clear any previously loaded LoRA
        try:
            pipe.unload_lora_weights()
        except:
            pass
        
        # Load LoRA weights
        pipe.load_lora_weights(
            "Owen777/Kontext-Style-Loras",
            weight_name=lora_filename,
            adapter_name="style"
        )
        pipe.set_adapters(["style"], adapter_weights=[1.0])
        
        # Create prompt for style transformation
        style_name_readable = style_name.replace('_', ' ')
        prompt = f"Turn this image into the {style_name_readable} style."
        if prompt_suffix and prompt_suffix.strip():
            prompt += f" {prompt_suffix.strip()}"
        
        print(f"Generating with prompt: {prompt}")
        
        # Generate the styled image
        result = pipe(
            image=image,
            prompt=prompt,
            guidance_scale=guidance_scale,
            num_inference_steps=num_inference_steps,
            generator=generator,
            height=1024,
            width=1024
        )
        
        # Clear GPU memory
        torch.cuda.empty_cache()
        
        return result.images[0]
        
    except Exception as e:
        print(f"Error: {str(e)}")
        gr.Error(f"Error during style transfer: {str(e)}")
        torch.cuda.empty_cache()
        return None

def select_style(style_name):
    """Handler for thumbnail clicks"""
    return style_name, style_descriptions.get(style_name, "")

def create_thumbnail_grid():
    """Create a gallery of style thumbnails"""
    thumbnails = []
    styles = list(style_type_lora_dict.keys())
    
    for style in styles:
        thumbnail_file = thumbnail_mapping.get(style, "")
        if thumbnail_file and os.path.exists(thumbnail_file):
            try:
                img = Image.open(thumbnail_file)
                thumbnails.append((img, style.replace('_', ' ')))
            except Exception as e:
                print(f"Error loading thumbnail {thumbnail_file}: {e}")
                # Create placeholder if thumbnail fails to load
                placeholder = Image.new('RGB', (256, 256), color='lightgray')
                thumbnails.append((placeholder, style.replace('_', ' ')))
        else:
            # Create placeholder for missing thumbnails
            placeholder = Image.new('RGB', (256, 256), color='lightgray')
            thumbnails.append((placeholder, style.replace('_', ' ')))
    
    return thumbnails

# Create Gradio interface
with gr.Blocks(title="FLUX.1 Kontext Style Transfer", theme=gr.themes.Soft()) as demo:
    gr.Markdown("""
    # 🎨 FLUX.1 Kontext Style Transfer
    
    Transform your images into various artistic styles using FLUX.1-Kontext-dev and high-quality style LoRAs.
    
    This demo uses the official Owen777/Kontext-Style-Loras collection with 22 different artistic styles!
    """)
    
    # Thumbnail Grid Section
    gr.Markdown("### 🖼️ Click a style thumbnail to select it:")
    
    with gr.Row():
        style_gallery = gr.Gallery(
            value=create_thumbnail_grid(),
            label="Style Thumbnails",
            show_label=False,
            elem_id="style_gallery",
            columns=6,
            rows=4,
            object_fit="cover",
            height="auto",
            interactive=True,
            show_download_button=False
        )
    
    gr.Markdown("---")
    
    with gr.Row():
        with gr.Column(scale=1):
            input_image = gr.Image(
                label="Upload Image",
                type="pil",
                height=400
            )
            
            style_dropdown = gr.Dropdown(
                choices=list(style_type_lora_dict.keys()),
                value="Ghibli",
                label="Selected Style",
                info="Choose from 22 different artistic styles or click a thumbnail above",
                elem_id="style_dropdown"
            )
            
            style_info = gr.Textbox(
                label="Style Description",
                value=style_descriptions["Ghibli"],
                interactive=False,
                lines=2
            )
            
            prompt_suffix = gr.Textbox(
                label="Additional Instructions (Optional)",
                placeholder="Add extra details like 'make it more colorful' or 'add dramatic lighting'...",
                lines=2
            )
            
            with gr.Accordion("Advanced Settings", open=False):
                num_steps = gr.Slider(
                    minimum=10,
                    maximum=50,
                    value=24,
                    step=1,
                    label="Inference Steps",
                    info="More steps = better quality but slower"
                )
                
                guidance = gr.Slider(
                    minimum=1.0,
                    maximum=5.0,
                    value=2.5,
                    step=0.1,
                    label="Guidance Scale",
                    info="How closely to follow the prompt (2.5 recommended)"
                )
                
                seed = gr.Number(
                    label="Seed",
                    value=42,
                    precision=0,
                    info="Set to 0 for random results"
                )
            
            generate_btn = gr.Button("🎨 Transform Image", variant="primary", size="lg")
        
        with gr.Column(scale=1):
            output_image = gr.Image(
                label="Styled Result",
                type="pil",
                height=400
            )
            
            gr.Markdown("""
            ### 💡 Tips:
            - Click any thumbnail above to quickly select a style
            - All images are resized to 1024x1024
            - First run downloads the model (~12GB)
            - Each style transformation takes ~30-60 seconds
            - Try different styles to find the best match!
            - Use additional instructions for fine control
            """)
    
    # Handle gallery selection
    def on_gallery_select(evt: gr.SelectData):
        """Handle thumbnail selection from gallery"""
        selected_index = evt.index
        styles = list(style_type_lora_dict.keys())
        if 0 <= selected_index < len(styles):
            selected_style = styles[selected_index]
            return selected_style, style_descriptions.get(selected_style, "")
        return None, None
    
    style_gallery.select(
        fn=on_gallery_select,
        inputs=None,
        outputs=[style_dropdown, style_info]
    )
    
    # Update style description when style changes
    def update_description(style):
        return style_descriptions.get(style, "")
    
    style_dropdown.change(
        fn=update_description,
        inputs=[style_dropdown],
        outputs=[style_info]
    )
    
    # Examples
    gr.Examples(
        examples=[
            ["https://huggingface.co/datasets/black-forest-labs/kontext-bench/resolve/main/test/images/0003.jpg", "Ghibli", ""],
            ["https://huggingface.co/datasets/black-forest-labs/kontext-bench/resolve/main/test/images/0003.jpg", "3D_Chibi", "make it extra cute"],
            ["https://huggingface.co/datasets/black-forest-labs/kontext-bench/resolve/main/test/images/0003.jpg", "Van_Gogh", "with swirling sky"],
            ["https://huggingface.co/datasets/black-forest-labs/kontext-bench/resolve/main/test/images/0003.jpg", "Pixel", "8-bit retro game style"],
        ],
        inputs=[input_image, style_dropdown, prompt_suffix],
        outputs=output_image,
        fn=style_transfer,
        cache_examples=False
    )
    
    # Connect the generate button
    generate_btn.click(
        fn=style_transfer,
        inputs=[input_image, style_dropdown, prompt_suffix, num_steps, guidance, seed],
        outputs=output_image
    )
    
    gr.Markdown("""
    ---
    ### 📚 Available Styles:
    
    **Anime/Cartoon**: Ghibli, American Cartoon, Jojo, Snoopy, Rick & Morty, Irasutoya  
    **3D/Geometric**: 3D Chibi, Poly, LEGO, Clay Toy  
    **Traditional Art**: Chinese Ink, Oil Painting, Van Gogh, Picasso, Pop Art  
    **Craft/Material**: Fabric, Origami, Paper Cutting, Macaron  
    **Digital/Modern**: Pixel, Line, Vector
    
    ---
    
    Powered by ❤️ https://discord.gg/openfreeai
    """)

if __name__ == "__main__":
    demo.launch()