BitmapUtil.java 文件源码

private static int calculateInSampleSize(Options options, int reqWidth, int reqHeight) {
    int height = options.outHeight;
    int width = options.outWidth;
    int inSampleSize = 1;
    if (height > reqHeight || width > reqWidth) {
        int halfHeight = height / 2;
        int halfWidth = width / 2;
        inSampleSize = 2;
        while (true) {
            if (halfHeight / inSampleSize <= reqHeight && halfWidth / inSampleSize <=
                    reqWidth) {
                break;
            }
            inSampleSize *= 2;
        }
    }
    Helper.showLog("Bitmap Util:", inSampleSize + "");
    return inSampleSize;
}