onnx-web/api/onnx_web/chain/source_txt2img.py

from diffusers import (
    OnnxStableDiffusionPipeline,
)
from logging import getLogger
from PIL import Image

from ..diffusion.load import (
    get_latents_from_seed,
    load_pipeline,
)
from ..params import (
    ImageParams,
    Size,
    StageParams,
)
from ..utils import (
    ServerContext,
)

import numpy as np

logger = getLogger(__name__)


def source_txt2img(
    ctx: ServerContext,
    stage: StageParams,
    params: ImageParams,
    source_image: Image.Image,
    *,
    size: Size,
    prompt: str = None,
    **kwargs,
) -> Image.Image:
    prompt = prompt or params.prompt
    logger.info('generating image using txt2img, %s steps: %s', params.steps, prompt)

    if source_image is not None:
        logger.warn('a source image was passed to a txt2img stage, but will be discarded')

    pipe = load_pipeline(OnnxStableDiffusionPipeline,
                            params.model, params.provider, params.scheduler)

    latents = get_latents_from_seed(params.seed, size)
    rng = np.random.RandomState(params.seed)

    result = pipe(
        prompt,
        height=size.height,
        width=size.width,
        generator=rng,
        guidance_scale=params.cfg,
        latents=latents,
        negative_prompt=params.negative_prompt,
        num_inference_steps=params.steps,
    )
    output = result.images[0]

    logger.info('final output image size: %sx%s', output.width, output.height)
    return output