tests/test_image_resize.py

from __future__ import annotations

from PIL import Image

import kneiff.utils.image.resize as resize_utils


def test_size_for_pixel_area_bounds_downscales_aspect_ratio() -> None:
    size = resize_utils.size_for_pixel_area_bounds(
        (2000, 1000),
        max_pixel_area=1000,
    )

    assert size == (1414, 707)


def test_size_for_pixel_area_bounds_upscales_aspect_ratio() -> None:
    size = resize_utils.size_for_pixel_area_bounds(
        (100, 50),
        min_pixel_area=200,
    )

    assert size == (283, 141)


def test_size_for_pixel_area_bounds_keeps_in_range_size() -> None:
    size = resize_utils.size_for_pixel_area_bounds(
        (1200, 800),
        min_pixel_area=768,
        max_pixel_area=1536,
    )

    assert size == (1200, 800)


def test_resize_to_pixel_area_bounds_uses_lanczos_resize() -> None:
    image = Image.new("RGB", (2000, 1000), color="white")

    resized = resize_utils.resize_to_pixel_area_bounds(
        image,
        max_pixel_area=1000,
    )

    assert resized.size == (1414, 707)