/// <summary>
/// Initialization of JPEG compression objects.
/// The error manager must already be set up (in case memory manager fails).
/// </summary>
private void initialize()
{
/* Zero out pointers to permanent structures. */
m_progress = null;
m_src = null;
for (int i = 0; i < JpegConstants.NUM_QUANT_TBLS; i++)
m_quant_tbl_ptrs[i] = null;
for (int i = 0; i < JpegConstants.NUM_HUFF_TBLS; i++)
{
m_dc_huff_tbl_ptrs[i] = null;
m_ac_huff_tbl_ptrs[i] = null;
}
/* Initialize marker processor so application can override methods
* for COM, APPn markers before calling jpeg_read_header.
*/
m_marker_list = new List<jpeg_marker_struct>();
m_marker = new jpeg_marker_reader(this);
/* And initialize the overall input controller. */
m_inputctl = new jpeg_input_controller(this);
/* OK, I'm ready */
m_global_state = JpegState.DSTATE_START;
}
private void cleanState()
{
m_jpeg_interchange_format = 0;
m_jpeg_interchange_format_length = 0;
m_jpeg_proc = 0;
m_subsamplingcorrect_done = false;
m_subsampling_tag = false;
m_subsampling_hor = 0;
m_subsampling_ver = 0;
m_qtable_offset_count = 0;
m_dctable_offset_count = 0;
m_actable_offset_count = 0;
m_qtable_offset = new uint[3];
m_dctable_offset = new uint[3];
m_actable_offset = new uint[3];
m_restart_interval = 0;
m_libjpeg_jpeg_decompress_struct = null;
m_file_size = 0;
m_image_width = 0;
m_image_length = 0;
m_strile_width = 0;
m_strile_length = 0;
m_strile_length_total = 0;
m_samples_per_pixel = 0;
m_plane_sample_offset = 0;
m_samples_per_pixel_per_plane = 0;
m_subsamplingcorrect = false;
m_subsampling_force_desubsampling_inside_decompression = false;
m_qtable = new byte[4][];
m_dctable = new byte[4][];
m_actable = new byte[4][];
m_restart_index = 0;
m_sof_log = false;
m_sof_marker_id = 0;
m_sof_x = 0;
m_sof_y = 0;
m_sof_c = new byte[3];
m_sof_hv = new byte[3];
m_sof_tq = new byte[3];
m_sos_cs = new byte[3];
m_sos_tda = new byte[3];
m_sos_end = new SosEnd[3];
m_readheader_done = false;
m_writeheader_done = false;
m_write_cursample = 0;
m_write_curstrile = 0;
m_libjpeg_session_active = false;
m_libjpeg_jpeg_query_style = 0;
m_libjpeg_jpeg_error_mgr = null;
m_libjpeg_jpeg_source_mgr = null;
m_subsampling_convert_log = false;
m_subsampling_convert_ylinelen = 0;
m_subsampling_convert_ylines = 0;
m_subsampling_convert_clinelen = 0;
m_subsampling_convert_clines = 0;
m_subsampling_convert_ybuf = null;
m_subsampling_convert_cbbuf = null;
m_subsampling_convert_crbuf = null;
m_subsampling_convert_ycbcrimage = null;
m_subsampling_convert_clinelenout = 0;
m_subsampling_convert_state = 0;
m_bytes_per_line = 0;
m_lines_per_strile = 0;
m_in_buffer_source = OJPEGStateInBufferSource.osibsNotSetYet;
m_in_buffer_next_strile = 0;
m_in_buffer_strile_count = 0;
m_in_buffer_file_pos = 0;
m_in_buffer_file_pos_log = false;
m_in_buffer_file_togo = 0;
m_in_buffer_togo = 0;
m_in_buffer_cur = 0; // index into m_in_buffer
m_in_buffer = new byte[OJPEG_BUFFER];
m_out_state = 0;
m_out_buffer = new byte[OJPEG_BUFFER];
m_skip_buffer = null;
m_forceProcessedRgbOutput = false;
}
/// <summary>
/// Sets input stream.
/// </summary>
/// <param name="infile">The input stream.</param>
/// <remarks>
/// The caller must have already opened the stream, and is responsible
/// for closing it after finishing decompression.
/// </remarks>
/// <seealso href="9d052723-a7f9-42de-8747-0bd9896f8157.htm" target="_self">Decompression details</seealso>
public void jpeg_stdio_src(Stream infile)
{
/* The source object and input buffer are made permanent so that a series
* of JPEG images can be read from the same file by calling jpeg_stdio_src
* only before the first one. (If we discarded the buffer at the end of
* one image, we'd likely lose the start of the next one.)
* This makes it unsafe to use this manager and a different source
* manager serially with the same JPEG object. Caveat programmer.
*/
if (m_src == null)
{
/* first time for this JPEG object? */
m_src = new my_source_mgr(this);
}
my_source_mgr m = m_src as my_source_mgr;
if (m != null)
m.Attach(infile);
}
private bool OJPEGWriteHeaderInfo()
{
Debug.Assert(!m_libjpeg_session_active);
m_out_state = OJPEGStateOutState.ososSoi;
m_restart_index = 0;
m_libjpeg_jpeg_error_mgr = new OJpegErrorManager(this);
if (!jpeg_create_decompress_encap())
return false;
m_libjpeg_session_active = true;
m_libjpeg_jpeg_source_mgr = new OJpegSrcManager(this);
m_libjpeg_jpeg_decompress_struct.Src = m_libjpeg_jpeg_source_mgr;
if (jpeg_read_header_encap(true) == ReadResult.JPEG_SUSPENDED)
return false;
if (!m_subsampling_force_desubsampling_inside_decompression && (m_samples_per_pixel_per_plane > 1))
{
m_libjpeg_jpeg_decompress_struct.Raw_data_out = true;
m_libjpeg_jpeg_decompress_struct.Do_fancy_upsampling = false;
//#if JPEG_LIB_VERSION >= 70
// libjpeg_jpeg_decompress_struct.do_fancy_upsampling=FALSE;
//#endif
m_libjpeg_jpeg_query_style = 0;
if (!m_subsampling_convert_log)
{
Debug.Assert(m_subsampling_convert_ybuf == null);
Debug.Assert(m_subsampling_convert_cbbuf == null);
Debug.Assert(m_subsampling_convert_crbuf == null);
Debug.Assert(m_subsampling_convert_ycbcrimage == null);
m_subsampling_convert_ylinelen = (uint)((m_strile_width + m_subsampling_hor * 8 - 1) / (m_subsampling_hor * 8) * m_subsampling_hor * 8);
m_subsampling_convert_ylines = (uint)(m_subsampling_ver * 8);
m_subsampling_convert_clinelen = m_subsampling_convert_ylinelen / m_subsampling_hor;
m_subsampling_convert_clines = 8;
m_subsampling_convert_ybuf = new byte[m_subsampling_convert_ylines][];
for (int i = 0; i < m_subsampling_convert_ylines; i++)
m_subsampling_convert_ybuf[i] = new byte[m_subsampling_convert_ylinelen];
m_subsampling_convert_cbbuf = new byte[m_subsampling_convert_clines][];
m_subsampling_convert_crbuf = new byte[m_subsampling_convert_clines][];
for (int i = 0; i < m_subsampling_convert_clines; i++)
{
m_subsampling_convert_cbbuf[i] = new byte[m_subsampling_convert_clinelen];
m_subsampling_convert_crbuf[i] = new byte[m_subsampling_convert_clinelen];
}
m_subsampling_convert_ycbcrimage = new byte[3][][];
m_subsampling_convert_ycbcrimage[0] = new byte[m_subsampling_convert_ylines][];
for (uint n = 0; n < m_subsampling_convert_ylines; n++)
m_subsampling_convert_ycbcrimage[0][n] = m_subsampling_convert_ybuf[n];
m_subsampling_convert_ycbcrimage[1] = new byte[m_subsampling_convert_clines][];
for (uint n = 0; n < m_subsampling_convert_clines; n++)
m_subsampling_convert_ycbcrimage[1][n] = m_subsampling_convert_cbbuf[n];
m_subsampling_convert_ycbcrimage[2] = new byte[m_subsampling_convert_clines][];
for (uint n = 0; n < m_subsampling_convert_clines; n++)
m_subsampling_convert_ycbcrimage[2][n] = m_subsampling_convert_crbuf[n];
m_subsampling_convert_clinelenout = ((m_strile_width + m_subsampling_hor - 1) / m_subsampling_hor);
m_subsampling_convert_state = 0;
m_bytes_per_line = (uint)(m_subsampling_convert_clinelenout * (m_subsampling_ver * m_subsampling_hor + 2));
m_lines_per_strile = ((m_strile_length + m_subsampling_ver - 1) / m_subsampling_ver);
m_subsampling_convert_log = true;
}
}
else
{
if (m_forceProcessedRgbOutput)
{
m_libjpeg_jpeg_decompress_struct.Do_fancy_upsampling = false;
m_libjpeg_jpeg_decompress_struct.Jpeg_color_space = J_COLOR_SPACE.JCS_YCbCr;
m_libjpeg_jpeg_decompress_struct.Out_color_space = J_COLOR_SPACE.JCS_RGB;
}
else
{
m_libjpeg_jpeg_decompress_struct.Jpeg_color_space = J_COLOR_SPACE.JCS_UNKNOWN;
m_libjpeg_jpeg_decompress_struct.Out_color_space = J_COLOR_SPACE.JCS_UNKNOWN;
}
m_libjpeg_jpeg_query_style = 1;
m_bytes_per_line = m_samples_per_pixel_per_plane * m_strile_width;
m_lines_per_strile = m_strile_length;
}
if (!jpeg_start_decompress_encap())
return false;
m_writeheader_done = true;
return true;
}