app.py

import gradio as gr
import numpy as np
import torch
import spaces
import random 
from diffusers import AutoPipelineForText2Image
from PIL import Image

MAX_SEED = np.iinfo(np.int32).max
MAX_IMAGE_SIZE = 2048

pipe = AutoPipelineForText2Image.from_pretrained(
    "ostris/Flex.2-preview",
    custom_pipeline="pipeline.py",
    torch_dtype=torch.bfloat16,
).to("cuda")

@spaces.GPU
def infer(edit_images, prompt, seed=42, randomize_seed=False, width=1024, height=1024, guidance_scale=3.5, control_strength=0.5, control_stop=0.33, num_inference_steps=50, progress=gr.Progress(track_tqdm=True)):
    image = edit_images["background"].convert("RGB")
    mask = edit_images["layers"][0].convert("RGB")
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    out_image = pipe(
        prompt=prompt,
        inpaint_image=image,
        inpaint_mask=mask,
        height=height,
        width=width,
        guidance_scale=guidance_scale,
        control_strength=control_strength, 
        control_stop=control_stop,
        num_inference_steps=num_inference_steps,
        generator=torch.Generator("cpu").manual_seed(seed)
    ).images[0]
    return (image, out_image), seed

def create_example_card(example):
    return f"""
    <div class="example-card">
        <p>{example}</p>
    </div>
    """

examples = [
    "a tiny astronaut hatching from an egg on the moon",
    "a cat holding a sign that says hello world",
    "an anime illustration of a wiener schnitzel",
]

example_html = "".join([create_example_card(ex) for ex in examples])

css = """
:root {
    --primary-color: #7E57C2;
    --secondary-color: #5E35B1;
    --accent-color: #B39DDB;
    --background-color: #F5F5F7;
    --card-background: #FFFFFF;
    --text-color: #333333;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --radius: 12px;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--background-color);
}

#col-container {
    margin: 0 auto;
    max-width: 1200px;
    padding: 0;
}

.container {
    background-color: var(--card-background);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
}

.header-container {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 24px;
    color: white;
    text-align: center;
    box-shadow: var(--shadow);
}

.header-container h1 {
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 8px;
    background: linear-gradient(to right, #ffffff, #e0e0e0);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-container p {
    font-size: 1.1rem;
    opacity: 0.92;
    margin-bottom: 16px;
}

.header-container a {
    color: var(--accent-color);
    text-decoration: underline;
    transition: opacity 0.2s;
}

.header-container a:hover {
    opacity: 0.8;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 8px;
    color: white;
    font-weight: 600;
    padding: 12px 24px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(126, 87, 194, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(126, 87, 194, 0.4);
}

.image-editor-container {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.prompt-container {
    background-color: var(--card-background);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    margin-top: 16px;
}

.result-container {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.settings-container {
    background-color: var(--card-background);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    margin-top: 16px;
}

.example-section {
    background-color: var(--card-background);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    margin-top: 24px;
}

.example-section h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.examples-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.example-card {
    background: linear-gradient(135deg, #f3f3f7, #ffffff);
    border-radius: 8px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid #e0e0e0;
    flex: 1;
    min-width: 200px;
}

.example-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--accent-color);
}

.example-card p {
    margin: 0;
    font-size: 14px;
    color: var(--text-color);
}

.accordion-header {
    font-weight: 600;
    color: var(--primary-color);
}

/* Custom slider styling */
input[type="range"] {
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

input[type="range"]::-webkit-slider-thumb {
    background: var(--primary-color);
    border: 2px solid white;
    height: 18px;
    width: 18px;
}

.footer {
    text-align: center;
    padding: 24px;
    color: #777;
    font-size: 14px;
}

/* Animate the result transition */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.result-animation {
    animation: fadeIn 0.5s ease-in-out;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .examples-grid {
        flex-direction: column;
    }
}
"""

with gr.Blocks(css=css, theme=gr.themes.Monochrome()) as demo:
    with gr.Column(elem_id="col-container"):
        # Header with gradient
        with gr.Column(elem_classes=["header-container"]):
            gr.HTML("""
                <h1>Flex.2 Preview - Inpaint</h1>
                <p>Advanced 8B parameter Text to Image Diffusion Model with universal control and built-in inpainting support</p>
                <p>Created by <a href="https://huggingface.co/ostris" target="_blank">ostris</a> | 
                <a href="https://huggingface.co/datasets/choosealicense/licenses/blob/main/markdown/apache-2.0.md" target="_blank">apache-2.0 license</a> | 
                <a href="https://huggingface.co/ostris/Flex.2-preview" target="_blank">model</a></p>
            """)
        
        # Main interface container
        with gr.Column(elem_classes=["container"]):
            with gr.Row():
                # Left column: Input
                with gr.Column(scale=1):
                    with gr.Column(elem_classes=["image-editor-container"]):
                        edit_image = gr.ImageEditor(
                            label='Upload and draw mask for inpainting',
                            type='pil',
                            sources=["upload", "webcam"],
                            image_mode='RGB',
                            layers=False,
                            brush=gr.Brush(colors=["#FFFFFF"], color_mode="fixed"),
                            height=500
                        )
                    
                    with gr.Column(elem_classes=["prompt-container"]):
                        prompt = gr.Text(
                            label="Your creative prompt",
                            show_label=True,
                            max_lines=1,
                            placeholder="Describe what you want to generate...",
                            container=True,
                        )
                        
                        run_button = gr.Button("✨ Generate", elem_classes=["btn-primary"])
                
                # Right column: Output
                with gr.Column(scale=1, elem_classes=["result-container"]):
                    result = gr.ImageSlider(
                        label="Before & After", 
                        type="pil", 
                        image_mode='RGB',
                        elem_classes=["result-animation"]
                    )
        
        # Advanced settings in a nice container
        with gr.Column(elem_classes=["settings-container"]):
            with gr.Accordion("Advanced Settings", open=False, elem_classes=["accordion-header"]):
                with gr.Column():
                    with gr.Row():
                        seed = gr.Slider(
                            label="Seed",
                            minimum=0,
                            maximum=MAX_SEED,
                            step=1,
                            value=0,
                        )
                        randomize_seed = gr.Checkbox(label="Randomize seed", value=True)
                    
                    with gr.Row():
                        height = gr.Slider(64, 2048, value=512, step=64, label="Height")
                        width = gr.Slider(64, 2048, value=512, step=64, label="Width")
                    
                    with gr.Row():
                        guidance_scale = gr.Slider(0.0, 20.0, value=3.5, step=0.1, label="Guidance Scale")
                        control_strength = gr.Slider(0.0, 1.0, value=0.5, step=0.05, label="Control Strength")
                    
                    with gr.Row():
                        control_stop = gr.Slider(0.0, 1.0, value=0.33, step=0.05, label="Control Stop")
                        num_inference_steps = gr.Slider(1, 100, value=50, step=1, label="Inference Steps")
        
        # Example prompts section
        with gr.Column(elem_classes=["example-section"]):
            gr.HTML(f"""
                <h3>Try these example prompts:</h3>
                <div class="examples-grid">
                    {example_html}
                </div>
            """)
            
            # Example functionality
            for i, example in enumerate(examples):
                gr.HTML(f"""
                <script>
                    document.querySelectorAll('.example-card')[{i}].addEventListener('click', function() {{
                        document.querySelector('textarea').value = "{example}";
                    }});
                </script>
                """)
        
        # Footer
        gr.HTML("""
            <div class="footer">
                <p>Powered by Gradio • Flex.2 Preview Inpainting Demo</p>
            </div>
        """)

    # Handle examples click to populate prompt
    run_button.click(
        fn=infer,
        inputs=[edit_image, prompt, seed, randomize_seed, width, height, guidance_scale, control_strength, control_stop, num_inference_steps],
        outputs=[result, seed]
    )
    
demo.launch()