コード例 #1
0
        /// <summary>
        /// The maximum size of the buffer (in bytes) required to hold a JPEG image with
        /// the given parameters.  The number of bytes returned by this function is
        /// larger than the size of the uncompressed source image.  The reason for this
        /// is that the JPEG format uses 16-bit coefficients, and it is thus possible
        /// for a very high-quality JPEG image with very high-frequency content to
        /// expand rather than compress when converted to the JPEG format.  Such images
        /// represent a very rare corner case, but since there is no way to predict the
        /// size of a JPEG image prior to compression, the corner case has to be handled.
        /// </summary>
        /// <param name="width">Width (in pixels) of the image.</param>
        /// <param name="height">Height (in pixels) of the image.</param>
        /// <param name="subSamp">
        /// The level of chrominance subsampling to be used when
        /// generating the JPEG image(see <see cref="TJSubsamplingOption"/> "Chrominance subsampling options".)
        /// </param>
        /// <returns>
        /// The maximum size of the buffer (in bytes) required to hold the image,
        /// or -1 if the arguments are out of bounds.
        /// </returns>
        public int GetBufferSize(int width, int height, TJSubsamplingOption subSamp)
        {
            Verify.NotDisposed(this);

            return((int)TurboJpegImport.TjBufSize(width, height, (int)subSamp));
        }