BitmapUtil.java 文件源码

/**
 * 计算缩放比例
 * @param options
 * @param reqWidth
 * 目标宽
 * @param reqHeight
 * 目标高
 * @return
 */
private int calculateInSampleSize(Options options,
        int reqWidth, int reqHeight) {

    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;
    if (reqWidth == 0 || reqHeight == 0) {
        return inSampleSize;
    }
    if (height > reqHeight || width > reqWidth) {
        if (width > height) {
            inSampleSize = Math.round((float) height / (float) reqHeight);
        } else {
            inSampleSize = Math.round((float) width / (float) reqWidth);
        }
    }

    Log.d("", "原图尺寸：" + width + "x" + height + ",实际尺寸：" + reqWidth + "x"
            + reqHeight + ",inSampleSize = " + inSampleSize);
    return inSampleSize;
}