自定义方法，参数取值超范围抛异常

港控/mmm° 2022-06-15 11:09 153阅读 0赞

/**
         * Compress a rectangle region in the YuvImage to a jpeg.
         * Only ImageFormat.NV21 and ImageFormat.YUY2
         * are supported for now.
         *
         * @param rectangle The rectangle region to be compressed. The medthod checks if rectangle is
         *                  inside the image. Also, the method modifies rectangle if the chroma pixels
         *                  in it are not matched with the luma pixels in it.
         * @param quality   Hint to the compressor, 0-100. 0 meaning compress for
         *                  small size, 100 meaning compress for max quality.
         * @param stream    OutputStream to write the compressed data.
         * @return          True if the compression is successful.
         * @throws IllegalArgumentException if rectangle is invalid; quality is not within [0,
         *                  100]; or stream is null.
         */
        public boolean compressToJpeg(Rect rectangle, int quality, OutputStream stream) {
            Rect wholeImage = new Rect(0, 0, mWidth, mHeight);
            if (!wholeImage.contains(rectangle)) {
                throw new IllegalArgumentException(
                        "rectangle is not inside the image");
            }
    
            if (quality < 0 || quality > 100) {
                throw new IllegalArgumentException("quality must be 0..100");
            }
    
            if (stream == null) {
                throw new IllegalArgumentException("stream cannot be null");
            }
    
            adjustRectangle(rectangle);
            int[] offsets = calculateOffsets(rectangle.left, rectangle.top);
     return nativeCompressToJpeg(mData, mFormat, rectangle.width(),
                    rectangle.height(), offsets, mStrides, quality, stream,
                    new byte[WORKING_COMPRESS_STORAGE]);
        }