ScalingUtil.java 文件源码

/**
 * Utility function for decoding an image resource. The decoded bitmap will
 * be optimized for further scaling to the requested destination dimensions
 * and scaling logic.
 *
 * @param res The resources object containing the image data
 * @param resId The resource id of the image data
 * @param dstWidth Width of destination area
 * @param dstHeight Height of destination area
 * @param scalingLogic Logic to use to avoid image stretching
 * @return Decoded bitmap
 */
public static Bitmap decodeResource(Resources res, int resId, int dstWidth, int dstHeight,
        ScalingLogic scalingLogic) {
    Options options = new Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);
    options.inJustDecodeBounds = false;
    options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, dstWidth,
            dstHeight, scalingLogic);
    Bitmap unscaledBitmap = BitmapFactory.decodeResource(res, resId, options);

    return unscaledBitmap;
}