from __future__ import annotations

import cv2
import numpy as np


TARGET_WIDTH = 1280
TARGET_HEIGHT = 720


def resize_to_target(image: np.ndarray, width: int = TARGET_WIDTH, height: int = TARGET_HEIGHT) -> np.ndarray:
    """将图像缩放到目标尺寸（仅当尺寸不一致时）"""
    h, w = image.shape[:2]
    if w == width and h == height:
        return image
    return cv2.resize(image, (width, height))


def bgr_to_rgba(bgr: np.ndarray) -> np.ndarray:
    """将BGR格式图像转换为RGBA格式"""
    return cv2.cvtColor(bgr, cv2.COLOR_BGR2RGBA)


def bgr_to_rgb(bgr: np.ndarray) -> np.ndarray:
    """将BGR格式图像转换为RGB格式"""
    return cv2.cvtColor(bgr, cv2.COLOR_BGR2RGB)