[游戏开发]Unity 压缩图片

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        /// <summary>
        /// 等比例压缩（根据高度）
        /// </summary>
        /// <param name="tex"></param>
        /// <param name="targetHeight"></param>
        /// <returns></returns>
        public static Texture2D ScaleTexture(this Texture2D tex, int targetHeight) {
            int width = tex.width;
            int height = tex.height;
            float whratio = width * 1.0f / height;
            if (height > targetHeight)
            {
                height = targetHeight;
                width = (int)(height * whratio);
                Debug.Log($"重置宽高：{tex.width}_{tex.height} => {width}_{height}");
            }
            return tex.ScaleTexture(width,height);
        }
              /// <summary>
        /// 压缩图片
        /// </summary>
        /// <param name="tex"></param>
        /// <param name="targetWidth"></param>
        /// <param name="targetHeight"></param>
        /// <returns></returns>
        public static Texture2D ScaleTexture(this Texture2D tex, int targetWidth, int targetHeight)
        {
            Texture2D res = new Texture2D(targetWidth, targetHeight, tex.format, true);
            Color[] pixels = res.GetPixels(0);
            float x = ((float)1 / tex.width) * ((float)tex.width / targetWidth);
            float y = ((float)1 / tex.height) * ((float)tex.height / targetHeight);
            for (int px = 0; px < pixels.Length; px++)
            {
                pixels[px] = tex.GetPixelBilinear(x * ((float)px % targetWidth), y * ((float)Mathf.Floor(px / targetWidth)));
            }
            res.SetPixels(pixels, 0);
            res.Apply();
            return res;
        }