test_utils.py

import base64
import mimetypes
from tempfile import NamedTemporaryFile
from typing import Dict, Tuple

import numpy as np
import pytest
from PIL import Image

from vllm.multimodal.utils import async_fetch_image, fetch_image

# Test different image extensions (JPG/PNG) and formats (gray/RGB/RGBA)
TEST_IMAGE_URLS = [
    "https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg",
    "https://upload.wikimedia.org/wikipedia/commons/f/fa/Grayscale_8bits_palette_sample_image.png",
    "https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Venn_diagram_rgb.svg/1280px-Venn_diagram_rgb.svg.png",
    "https://upload.wikimedia.org/wikipedia/commons/0/0b/RGBA_comp.png",
]


@pytest.fixture(scope="module")
def url_images() -> Dict[str, Image.Image]:
    return {image_url: fetch_image(image_url) for image_url in TEST_IMAGE_URLS}


def get_supported_suffixes() -> Tuple[str, ...]:
    # We should at least test the file types mentioned in GPT-4 with Vision
    OPENAI_SUPPORTED_SUFFIXES = ('.png', '.jpeg', '.jpg', '.webp', '.gif')

    # Additional file types that are supported by us
    EXTRA_SUPPORTED_SUFFIXES = ('.bmp', '.tiff')

    return OPENAI_SUPPORTED_SUFFIXES + EXTRA_SUPPORTED_SUFFIXES


def _image_equals(a: Image.Image, b: Image.Image) -> bool:
    return (np.asarray(a) == np.asarray(b.convert(a.mode))).all()


@pytest.mark.asyncio
@pytest.mark.parametrize("image_url", TEST_IMAGE_URLS)
async def test_fetch_image_http(image_url: str):
    image_sync = fetch_image(image_url)
    image_async = await async_fetch_image(image_url)
    assert _image_equals(image_sync, image_async)


@pytest.mark.asyncio
@pytest.mark.parametrize("image_url", TEST_IMAGE_URLS)
@pytest.mark.parametrize("suffix", get_supported_suffixes())
async def test_fetch_image_base64(url_images: Dict[str, Image.Image],
                                  image_url: str, suffix: str):
    url_image = url_images[image_url]

    try:
        mime_type = Image.MIME[Image.registered_extensions()[suffix]]
    except KeyError:
        try:
            mime_type = mimetypes.types_map[suffix]
        except KeyError:
            pytest.skip('No MIME type')

    with NamedTemporaryFile(suffix=suffix) as f:
        try:
            url_image.save(f.name)
        except Exception as e:
            if e.args[0] == 'cannot write mode RGBA as JPEG':
                pytest.skip('Conversion not supported')

            raise

        base64_image = base64.b64encode(f.read()).decode("utf-8")
        data_url = f"data:{mime_type};base64,{base64_image}"

        data_image_sync = fetch_image(data_url)
        if _image_equals(url_image, Image.open(f)):
            assert _image_equals(url_image, data_image_sync)
        else:
            pass  # Lossy format; only check that image can be opened

        data_image_async = await async_fetch_image(data_url)
        assert _image_equals(data_image_sync, data_image_async)