app.py

import os, gc, random, re
import gradio as gr
import torch, spaces
from PIL import Image, ImageFilter
import numpy as np
import qrcode
from qrcode.constants import ERROR_CORRECT_H
from diffusers import (
    StableDiffusionControlNetPipeline,
    StableDiffusionControlNetImg2ImgPipeline,   # for Hi-Res Fix
    ControlNetModel,
    DPMSolverMultistepScheduler,
)

# Quiet matplotlib cache warning on Spaces
os.environ.setdefault("MPLCONFIGDIR", "/tmp/mpl")


# ---- base models for the two tabs ----
BASE_MODELS = {
    "stable-diffusion-v1-5": "runwayml/stable-diffusion-v1-5",
    "dream":    "Lykon/dreamshaper-8",
}

# ControlNet (QR Monster v2 for SD15)
CN_QRMON = "monster-labs/control_v1p_sd15_qrcode_monster"
DTYPE = torch.float16

# ---------- helpers ----------
def snap8(x: int) -> int:
    x = max(256, min(1024, int(x)))
    return x - (x % 8)

def normalize_color(c):
    if c is None: return "white"
    if isinstance(c, (tuple, list)):
        r, g, b = (int(max(0, min(255, round(float(x))))) for x in c[:3]); return (r, g, b)
    if isinstance(c, str):
        s = c.strip()
        if s.startswith("#"): return s
        m = re.match(r"rgba?\(\s*([0-9.]+)\s*,\s*([0-9.]+)\s*,\s*([0-9.]+)", s, re.IGNORECASE)
        if m:
            r = int(max(0, min(255, round(float(m.group(1))))))
            g = int(max(0, min(255, round(float(m.group(2))))))
            b = int(max(0, min(255, round(float(m.group(3))))))
            return (r, g, b)
        return s
    return "white"

def make_qr(url="https://example.com", size=768, border=12, back_color="#FFFFFF", blur_radius=0.0):
    """
    IMPORTANT for Method 1: give ControlNet a sharp, black-on-WHITE QR (no blur).
    """
    qr = qrcode.QRCode(version=None, error_correction=ERROR_CORRECT_H, box_size=10, border=int(border))
    qr.add_data(url.strip()); qr.make(fit=True)
    img = qr.make_image(fill_color="black", back_color=normalize_color(back_color)).convert("RGB")
    img = img.resize((int(size), int(size)), Image.NEAREST)
    if blur_radius and blur_radius > 0:
        img = img.filter(ImageFilter.GaussianBlur(radius=float(blur_radius)))
    return img

def enforce_qr_contrast(stylized: Image.Image, qr_img: Image.Image, strength: float = 0.0, feather: float = 1.0) -> Image.Image:
    """Optional gentle repair. Default OFF for Method 1."""
    if strength <= 0: return stylized
    q = qr_img.convert("L")
    black_mask = q.point(lambda p: 255 if p < 128 else 0).filter(ImageFilter.GaussianBlur(radius=float(feather)))
    black = np.asarray(black_mask, dtype=np.float32) / 255.0
    white = 1.0 - black
    s = np.asarray(stylized.convert("RGB"), dtype=np.float32) / 255.0
    s = s * (1.0 - float(strength) * black[..., None])
    s = s + (1.0 - s) * (float(strength) * 0.85 * white[..., None])
    s = np.clip(s, 0.0, 1.0)
    return Image.fromarray((s * 255.0).astype(np.uint8), mode="RGB")

# ---------- lazy pipelines (CPU-offloaded for ZeroGPU) ----------
_CN = None                 # shared ControlNet QR Monster
_CN_TXT2IMG = {}           # per-base-model txt2img pipes
_CN_IMG2IMG = {}           # per-base-model img2img pipes

def _base_scheduler_for(pipe):
    pipe.scheduler = DPMSolverMultistepScheduler.from_config(
        pipe.scheduler.config, use_karras_sigmas=True, algorithm_type="dpmsolver++"
    )
    pipe.enable_attention_slicing()
    pipe.enable_vae_slicing()
    pipe.enable_model_cpu_offload()
    return pipe

def get_cn():
    global _CN
    if _CN is None:
        _CN = ControlNetModel.from_pretrained(CN_QRMON, torch_dtype=DTYPE, use_safetensors=True)
    return _CN

def get_qrmon_txt2img_pipe(model_id: str):
    if model_id not in _CN_TXT2IMG:
        pipe = StableDiffusionControlNetPipeline.from_pretrained(
            model_id,
            controlnet=get_cn(),
            torch_dtype=DTYPE,
            safety_checker=None,
            use_safetensors=True,
            low_cpu_mem_usage=True,
        )
        _CN_TXT2IMG[model_id] = _base_scheduler_for(pipe)
    return _CN_TXT2IMG[model_id]

def get_qrmon_img2img_pipe(model_id: str):
    if model_id not in _CN_IMG2IMG:
        pipe = StableDiffusionControlNetImg2ImgPipeline.from_pretrained(
            model_id,
            controlnet=get_cn(),
            torch_dtype=DTYPE,
            safety_checker=None,
            use_safetensors=True,
            low_cpu_mem_usage=True,
        )
        _CN_IMG2IMG[model_id] = _base_scheduler_for(pipe)
    return _CN_IMG2IMG[model_id]

# -------- Method 1: QR control model in text-to-image (+ optional Hi-Res Fix) --------
def _qr_txt2img_core(model_id: str,
                     url: str, style_prompt: str, negative: str,
                     steps: int, cfg: float, size: int, border: int,
                     qr_weight: float, seed: int,
                     use_hires: bool, hires_upscale: float, hires_strength: float,
                     repair_strength: float, feather: float):

    s = snap8(size)

    # Control image: crisp black-on-white QR
    qr_img = make_qr(url=url, size=s, border=int(border), back_color="#FFFFFF", blur_radius=0.0)

    # Seed / generator
    if int(seed) < 0:
        seed = random.randint(0, 2**31 - 1)
    gen = torch.Generator(device="cuda").manual_seed(int(seed))

    # --- Stage A: txt2img with ControlNet
    pipe = get_qrmon_txt2img_pipe(model_id)
    if torch.cuda.is_available(): torch.cuda.empty_cache()
    gc.collect()
    with torch.autocast(device_type="cuda", dtype=DTYPE):
        out = pipe(
            prompt=str(style_prompt),
            negative_prompt=str(negative or ""),
            image=qr_img,                                   # control image for txt2img
            controlnet_conditioning_scale=float(qr_weight), # ~1.0–1.2 works well
            control_guidance_start=0.0,
            control_guidance_end=1.0,
            num_inference_steps=int(steps),
            guidance_scale=float(cfg),
            width=s, height=s,
            generator=gen,
        )
    lowres = out.images[0]
    lowres = enforce_qr_contrast(lowres, qr_img, strength=float(repair_strength), feather=float(feather))

    # --- Optional Stage B: Hi-Res Fix (img2img with same QR)
    final = lowres
    if use_hires:
        up = max(1.0, min(2.0, float(hires_upscale)))
        W = snap8(int(s * up)); H = W
        pipe2 = get_qrmon_img2img_pipe(model_id)
        if torch.cuda.is_available(): torch.cuda.empty_cache()
        gc.collect()
        with torch.autocast(device_type="cuda", dtype=DTYPE):
            out2 = pipe2(
                prompt=str(style_prompt),
                negative_prompt=str(negative or ""),
                image=lowres,                      # init image
                control_image=qr_img,              # same QR
                strength=float(hires_strength),    # ~0.7 like "Hires Fix"
                controlnet_conditioning_scale=float(qr_weight),
                control_guidance_start=0.0,
                control_guidance_end=1.0,
                num_inference_steps=int(steps),
                guidance_scale=float(cfg),
                width=W, height=H,
                generator=gen,
            )
        final = out2.images[0]

    final = enforce_qr_contrast(final, qr_img, strength=float(repair_strength), feather=float(feather))
    return final, lowres, qr_img

# Wrappers for each tab (so Gradio can bind without passing the model id)
@spaces.GPU(duration=120)
def qr_txt2img_anything(*args):
    return _qr_txt2img_core(BASE_MODELS["stable-diffusion-v1-5"], *args)

@spaces.GPU(duration=120)
def qr_txt2img_dream(*args):
    return _qr_txt2img_core(BASE_MODELS["dream"], *args)

# ---------- UI ----------
with gr.Blocks() as demo:
    gr.Markdown("# ZeroGPU • Method 1: QR Control (two base models)")

    # ---- Tab 1: stable-diffusion-v1-5 (anime/illustration) ----
    with gr.Tab("stable-diffusion-v1-5"):
        url1       = gr.Textbox(label="URL/Text", value="http://www.mybirdfire.com")
        s_prompt1  = gr.Textbox(label="Style prompt", value="japanese painting, elegant shrine and torii, distant mount fuji, autumn maple trees, warm sunlight, 1girl in kimono, highly detailed, intricate patterns, anime key visual, dramatic composition")
        s_negative1= gr.Textbox(label="Negative prompt", value="ugly, low quality, blurry, nsfw, watermark, text, low contrast, deformed, extra digits")
        size1      = gr.Slider(384, 1024, value=512, step=64, label="Canvas (px)")
        steps1     = gr.Slider(10, 50, value=20, step=1, label="Steps")
        cfg1       = gr.Slider(1.0, 12.0, value=7.0, step=0.1, label="CFG")
        border1    = gr.Slider(2, 16, value=4, step=1, label="QR border (quiet zone)")
        qr_w1      = gr.Slider(0.6, 1.6, value=1.5, step=0.05, label="QR control weight")
        seed1      = gr.Number(value=-1, precision=0, label="Seed (-1 random)")

        use_hires1 = gr.Checkbox(value=True, label="Hi-Res Fix (img2img upscale)")
        hires_up1  = gr.Slider(1.0, 2.0, value=2.0, step=0.25, label="Hi-Res upscale (×)")
        hires_str1 = gr.Slider(0.3, 0.9, value=0.7, step=0.05, label="Hi-Res denoise strength")

        repair1    = gr.Slider(0.0, 1.0, value=0.0, step=0.05, label="Post repair strength (optional)")
        feather1   = gr.Slider(0.0, 3.0, value=1.0, step=0.1, label="Repair feather (px)")

        final_img1 = gr.Image(label="Final (or Hi-Res) image")
        low_img1   = gr.Image(label="Low-res (Stage A) preview")
        ctrl_img1  = gr.Image(label="Control QR used")

        gr.Button("Generate with stable-diffusion-v1-5").click(
            qr_txt2img_anything,
            [url1, s_prompt1, s_negative1, steps1, cfg1, size1, border1, qr_w1, seed1,
             use_hires1, hires_up1, hires_str1, repair1, feather1],
            [final_img1, low_img1, ctrl_img1]
        )

    # ---- Tab 2: DreamShaper (general art/painterly) ----
    with gr.Tab("DreamShaper 8"):
        url2       = gr.Textbox(label="URL/Text", value="http://www.mybirdfire.com")
        s_prompt2  = gr.Textbox(label="Style prompt", value="ornate baroque palace interior, gilded details, chandeliers, volumetric light, ultra detailed, cinematic")
        s_negative2= gr.Textbox(label="Negative prompt", value="lowres, low contrast, blurry, jpeg artifacts, watermark, text, bad anatomy")
        size2      = gr.Slider(384, 1024, value=512, step=64, label="Canvas (px)")
        steps2     = gr.Slider(10, 50, value=24, step=1, label="Steps")
        cfg2       = gr.Slider(1.0, 12.0, value=6.8, step=0.1, label="CFG")
        border2    = gr.Slider(2, 16, value=8, step=1, label="QR border (quiet zone)")
        qr_w2      = gr.Slider(0.6, 1.6, value=1.5, step=0.05, label="QR control weight")
        seed2      = gr.Number(value=-1, precision=0, label="Seed (-1 random)")

        use_hires2 = gr.Checkbox(value=True, label="Hi-Res Fix (img2img upscale)")
        hires_up2  = gr.Slider(1.0, 2.0, value=2.0, step=0.25, label="Hi-Res upscale (×)")
        hires_str2 = gr.Slider(0.3, 0.9, value=0.7, step=0.05, label="Hi-Res denoise strength")

        repair2    = gr.Slider(0.0, 1.0, value=0.0, step=0.05, label="Post repair strength (optional)")
        feather2   = gr.Slider(0.0, 3.0, value=1.0, step=0.1, label="Repair feather (px)")

        final_img2 = gr.Image(label="Final (or Hi-Res) image")
        low_img2   = gr.Image(label="Low-res (Stage A) preview")
        ctrl_img2  = gr.Image(label="Control QR used")

        gr.Button("Generate with DreamShaper 8").click(
            qr_txt2img_dream,
            [url2, s_prompt2, s_negative2, steps2, cfg2, size2, border2, qr_w2, seed2,
             use_hires2, hires_up2, hires_str2, repair2, feather2],
            [final_img2, low_img2, ctrl_img2]
        )

if __name__ == "__main__":
    demo.queue(max_size=12).launch()