BitmapUtils.java 文件源码

private static int caculateInSampleSize(Options options, int rqsW, int rqsH) {
    int height = options.outHeight;
    int width = options.outWidth;
    int inSampleSize = 1;
    if (rqsW == 0 || rqsH == 0) {
        return 1;
    }
    if (height > rqsH || width > rqsW) {
        int heightRatio = Math.round(((float) height) / ((float) rqsH));
        int widthRatio = Math.round(((float) width) / ((float) rqsW));
        if (heightRatio < widthRatio) {
            inSampleSize = heightRatio;
        } else {
            inSampleSize = widthRatio;
        }
    }
    return inSampleSize;
}