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from typing import Union, Tuple, Callable
import cv2
import numpy as np
from qtpy.QtGui import QColor, QPixmap, QImage
from .misc import pixmap2ndarray, ndarray2pixmap
def apply_shadow_effect(img: Union[QPixmap, QImage, np.ndarray], color: QColor, strength=1.0, radius=21) -> Tuple[
QPixmap, np.ndarray, np.ndarray]:
if isinstance(color, QColor):
color = [color.red(), color.green(), color.blue()]
if not isinstance(img, np.ndarray):
img = pixmap2ndarray(img, keep_alpha=True)
mask = img[..., -1].copy()
ksize = radius * 2 + 1
mask = cv2.GaussianBlur(mask, (ksize, ksize), ksize / 6)
if strength != 1:
mask = np.clip(mask.astype(np.float32) * strength, 0, 255).astype(np.uint8)
bg_img = np.zeros((img.shape[0], img.shape[1], 4), dtype=np.uint8)
bg_img[..., :3] = np.array(color, np.uint8)
bg_img[..., 3] = mask
result = ndarray2pixmap(bg_img)
return result, img
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