ViewportWithCache.java 文件源码

ViewportWithCache(Point sceneSize, String filepath) throws IOException {
    mSceneSize = sceneSize;

    mVisibleViewport = new Viewport();
    mVisibleViewport.CONFIG = DEFAULT_CONFIG;

    mCachedBitmap = null;
    mCachedWindow = null;

    mDecoder = BitmapRegionDecoder.newInstance(filepath, false);

    // TODO Create the sample image, should calculate DOWN_SAMPLE_SHIFT here
    Options opts = new Options();
    opts.inPreferredConfig = DEFAULT_CONFIG;
    opts.inSampleSize = (1 << DOWN_SAMPLE_SHIFT);
    mSampledBitmap = BitmapFactory.decodeFile(filepath, opts);
}