private static void compress(Stream input, CompressOptions options, Stream output)
{
Debug.Assert(input != null);
Debug.Assert(options != null);
Debug.Assert(output != null);
jpeg_compress_struct cinfo = new jpeg_compress_struct(new cd_jpeg_error_mgr());
/* Initialize JPEG parameters.
* Much of this may be overridden later.
* In particular, we don't yet know the input file's color space,
* but we need to provide some value for jpeg_set_defaults() to work.
*/
cinfo.In_color_space = J_COLOR_SPACE.JCS_RGB; /* arbitrary guess */
cinfo.jpeg_set_defaults();
/* Figure out the input file format, and set up to read it. */
cjpeg_source_struct src_mgr = new bmp_source_struct(cinfo);
src_mgr.input_file = input;
/* Read the input file header to obtain file size & colorspace. */
src_mgr.start_input();
/* Now that we know input colorspace, fix colorspace-dependent defaults */
cinfo.jpeg_default_colorspace();
/* Adjust default compression parameters */
if (!applyOptions(cinfo, options))
return;
/* Specify data destination for compression */
cinfo.jpeg_stdio_dest(output);
/* Start compressor */
cinfo.jpeg_start_compress(true);
/* Process data */
while (cinfo.Next_scanline < cinfo.Image_height)
{
int num_scanlines = src_mgr.get_pixel_rows();
cinfo.jpeg_write_scanlines(src_mgr.buffer, num_scanlines);
}
/* Finish compression and release memory */
src_mgr.finish_input();
cinfo.jpeg_finish_compress();
/* All done. */
if (cinfo.Err.Num_warnings != 0)
Console.WriteLine("Corrupt-data warning count is not zero");
}
public void TestCompressorWithContextRows()
{
using (MemoryStream stream = new MemoryStream())
{
jpeg_compress_struct compressor = new jpeg_compress_struct(new jpeg_error_mgr());
compressor.Image_height = 100;
compressor.Image_width = 100;
compressor.In_color_space = J_COLOR_SPACE.JCS_GRAYSCALE;
compressor.Input_components = 1;
compressor.jpeg_set_defaults();
compressor.Dct_method = J_DCT_METHOD.JDCT_IFAST;
compressor.Smoothing_factor = 94;
compressor.jpeg_set_quality(75, true);
compressor.jpeg_simple_progression();
compressor.Density_unit = DensityUnit.Unknown;
compressor.X_density = (short)96;
compressor.Y_density = (short)96;
compressor.jpeg_stdio_dest(stream);
compressor.jpeg_start_compress(true);
byte[][] rowForDecompressor = new byte[1][];
int bytesPerPixel = 1;
while (compressor.Next_scanline < compressor.Image_height)
{
byte[] row = new byte[100 * bytesPerPixel]; // wasteful, but gets you 0 bytes every time - content is immaterial.
rowForDecompressor[0] = row;
compressor.jpeg_write_scanlines(rowForDecompressor, 1);
}
compressor.jpeg_finish_compress();
byte[] bytes = stream.ToArray();
string filename = "TestCompressorWithContextRows.jpg";
File.WriteAllBytes(Tester.MapOutputPath(filename), bytes);
FileAssert.AreEqual(Tester.MapExpectedPath(filename), Tester.MapOutputPath(filename));
}
}
static bool set_sample_factors(jpeg_compress_struct cinfo, string arg)
{
// not implemented yet
return false;
}
static bool set_quant_slots(jpeg_compress_struct cinfo, string arg)
{
// not implemented yet
return false;
}
static bool read_quant_tables(jpeg_compress_struct cinfo, string filename, int scale_factor, bool force_baseline)
{
// not implemented yet
return false;
}
private static bool applyOptions(jpeg_compress_struct compressor, CompressOptions options)
{
compressor.jpeg_set_quality(options.Quality, options.ForceBaseline);
compressor.Dct_method = options.DCTMethod;
if (options.Debug)
compressor.Err.Trace_level = 1;
if (options.Grayscale)
compressor.jpeg_set_colorspace(J_COLOR_SPACE.JCS_GRAYSCALE);
if (options.Optimize)
compressor.Optimize_coding = true;
compressor.Restart_interval = options.RestartInterval;
compressor.Restart_in_rows = options.RestartInRows;
compressor.Smoothing_factor = options.SmoothingFactor;
int q_scale_factor = 100;
if (options.Quality != 75)
q_scale_factor = jpeg_compress_struct.jpeg_quality_scaling(options.Quality);
/* Set quantization tables for selected quality. */
/* Some or all may be overridden if -qtables is present. */
if (options.Qtables != "") /* process -qtables if it was present */
{
if (!read_quant_tables(compressor, options.Qtables, q_scale_factor, options.ForceBaseline))
return false;
}
if (options.Qslots != "") /* process -qslots if it was present */
{
if (!set_quant_slots(compressor, options.Qslots))
return false;
}
if (options.Sample != "") /* process -sample if it was present */
{
if (!set_sample_factors(compressor, options.Sample))
return false;
}
if (options.Progressive) /* process -progressive; -scans can override */
compressor.jpeg_simple_progression();
return true;
}
/// <summary>
/// Initializes the compression object with default parameters, then copy from the source object
/// all parameters needed for lossless transcoding.
/// </summary>
/// <param name="dstinfo">Target JPEG compression object.</param>
/// <remarks>Parameters that can be varied without loss (such as scan script and
/// Huffman optimization) are left in their default states.</remarks>
public void jpeg_copy_critical_parameters(jpeg_compress_struct dstinfo)
{
/* Safety check to ensure start_compress not called yet. */
if (dstinfo.m_global_state != JpegState.CSTATE_START)
ERREXIT(J_MESSAGE_CODE.JERR_BAD_STATE, (int)dstinfo.m_global_state);
/* Copy fundamental image dimensions */
dstinfo.m_image_width = m_image_width;
dstinfo.m_image_height = m_image_height;
dstinfo.m_input_components = m_num_components;
dstinfo.m_in_color_space = m_jpeg_color_space;
/* Initialize all parameters to default values */
dstinfo.jpeg_set_defaults();
/* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
* Fix it to get the right header markers for the image colorspace.
*/
dstinfo.jpeg_set_colorspace(m_jpeg_color_space);
dstinfo.m_data_precision = m_data_precision;
dstinfo.m_CCIR601_sampling = m_CCIR601_sampling;
/* Copy the source's quantization tables. */
for (int tblno = 0; tblno < JpegConstants.NUM_QUANT_TBLS; tblno++)
{
if (m_quant_tbl_ptrs[tblno] != null)
{
if (dstinfo.m_quant_tbl_ptrs[tblno] == null)
dstinfo.m_quant_tbl_ptrs[tblno] = new JQUANT_TBL();
Buffer.BlockCopy(m_quant_tbl_ptrs[tblno].quantval, 0,
dstinfo.m_quant_tbl_ptrs[tblno].quantval, 0,
dstinfo.m_quant_tbl_ptrs[tblno].quantval.Length * sizeof(short));
dstinfo.m_quant_tbl_ptrs[tblno].Sent_table = false;
}
}
/* Copy the source's per-component info.
* Note we assume jpeg_set_defaults has allocated the dest comp_info array.
*/
dstinfo.m_num_components = m_num_components;
if (dstinfo.m_num_components < 1 || dstinfo.m_num_components> JpegConstants.MAX_COMPONENTS)
ERREXIT(J_MESSAGE_CODE.JERR_COMPONENT_COUNT, dstinfo.m_num_components, JpegConstants.MAX_COMPONENTS);
for (int ci = 0; ci < dstinfo.m_num_components; ci++)
{
dstinfo.Component_info[ci].Component_id = m_comp_info[ci].Component_id;
dstinfo.Component_info[ci].H_samp_factor = m_comp_info[ci].H_samp_factor;
dstinfo.Component_info[ci].V_samp_factor = m_comp_info[ci].V_samp_factor;
dstinfo.Component_info[ci].Quant_tbl_no = m_comp_info[ci].Quant_tbl_no;
/* Make sure saved quantization table for component matches the qtable
* slot. If not, the input file re-used this qtable slot.
* IJG encoder currently cannot duplicate this.
*/
int tblno = dstinfo.Component_info[ci].Quant_tbl_no;
if (tblno < 0 || tblno >= JpegConstants.NUM_QUANT_TBLS || m_quant_tbl_ptrs[tblno] == null)
ERREXIT(J_MESSAGE_CODE.JERR_NO_QUANT_TABLE, tblno);
JQUANT_TBL c_quant = m_comp_info[ci].quant_table;
if (c_quant != null)
{
JQUANT_TBL slot_quant = m_quant_tbl_ptrs[tblno];
for (int coefi = 0; coefi < JpegConstants.DCTSIZE2; coefi++)
{
if (c_quant.quantval[coefi] != slot_quant.quantval[coefi])
ERREXIT(J_MESSAGE_CODE.JERR_MISMATCHED_QUANT_TABLE, tblno);
}
}
/* Note: we do not copy the source's Huffman table assignments;
* instead we rely on jpeg_set_colorspace to have made a suitable choice.
*/
}
/* Also copy JFIF version and resolution information, if available.
* Strictly speaking this isn't "critical" info, but it's nearly
* always appropriate to copy it if available. In particular,
* if the application chooses to copy JFIF 1.02 extension markers from
* the source file, we need to copy the version to make sure we don't
* emit a file that has 1.02 extensions but a claimed version of 1.01.
* We will *not*, however, copy version info from mislabeled "2.01" files.
*/
if (m_saw_JFIF_marker)
{
if (m_JFIF_major_version == 1)
{
dstinfo.m_JFIF_major_version = m_JFIF_major_version;
dstinfo.m_JFIF_minor_version = m_JFIF_minor_version;
}
dstinfo.m_density_unit = m_density_unit;
dstinfo.m_X_density = (short)m_X_density;
dstinfo.m_Y_density = (short)m_Y_density;
}
}
private void cleanState()
{
m_compression = null;
m_decompression = null;
m_common = null;
m_h_sampling = 0;
m_v_sampling = 0;
m_jpegtables = null;
m_jpegtables_length = 0;
m_jpegquality = 0;
m_jpegcolormode = 0;
m_jpegtablesmode = 0;
m_ycbcrsampling_fetched = false;
m_recvparams = 0;
m_subaddress = null;
m_recvtime = 0;
m_faxdcs = null;
m_rawDecode = false;
m_rawEncode = false;
m_cinfo_initialized = false;
m_err = null;
m_photometric = 0;
m_bytesperline = 0;
m_ds_buffer = new byte[JpegConstants.MAX_COMPONENTS][][];
m_scancount = 0;
m_samplesperclump = 0;
}
/*
* Interface routines. This layer of routines exists
* primarily to limit side-effects from LibJpeg.Net exceptions.
* Also, normal/error returns are converted into return
* values per LibTiff.Net practice.
*/
private bool TIFFjpeg_create_compress()
{
/* initialize JPEG error handling */
try
{
m_compression = new jpeg_compress_struct(new JpegErrorManager(this));
m_common = m_compression;
}
catch (Exception)
{
return false;
}
return true;
}
public bmp_source_struct(jpeg_compress_struct cinfo)
{
this.cinfo = cinfo;
}
public static string IncImageDCT(string fullPath)
{
string suffix = "testDCT";
var img = new Bitmap(fullPath);
var width = img.Width;
var height = img.Height;
int hd = height / 8;
int wd = width / 8;
img.Dispose();
BitMiracle.LibJpeg.Classic.jpeg_decompress_struct oJpegDecompress = new BitMiracle.LibJpeg.Classic.jpeg_decompress_struct();
System.IO.FileStream oFileStreamImage = new System.IO.FileStream(fullPath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
oJpegDecompress.jpeg_stdio_src(oFileStreamImage);
oJpegDecompress.jpeg_read_header(true);
BitMiracle.LibJpeg.Classic.jvirt_array<BitMiracle.LibJpeg.Classic.JBLOCK>[] JBlock = oJpegDecompress.jpeg_read_coefficients();
var block = JBlock[0].Access(0, hd); // accessing the element
for (int i = 0; i < hd; i++)
{
for (int j = 0; j < wd; j++)
{
short t = block[i][j].data[0];
if ((t >= 0 && t % 2 == 1) || (t < 0 && t % 2 == 0))
{
t--;
}
else if ((t >= 0 && t % 2 == 0) || (t < 0 && t % 2 == 1))
{
t++;
}
block[i][j].data[0] = t;
}
}
oJpegDecompress.jpeg_finish_decompress();
oFileStreamImage.Close();
////
string filenameNew = MyHelper.AppendFileName(fullPath, suffix);
System.IO.FileStream objFileStreamMegaMap = System.IO.File.Create(filenameNew);
BitMiracle.LibJpeg.Classic.jpeg_compress_struct oJpegCompress = new BitMiracle.LibJpeg.Classic.jpeg_compress_struct();
oJpegCompress.jpeg_stdio_dest(objFileStreamMegaMap);
oJpegDecompress.jpeg_copy_critical_parameters(oJpegCompress);
oJpegCompress.Image_height = height;
oJpegCompress.Image_width = width;
oJpegCompress.jpeg_write_coefficients(JBlock);
oJpegCompress.jpeg_finish_compress();
objFileStreamMegaMap.Close();
oJpegDecompress.jpeg_abort_decompress();
return filenameNew;
}
static string outfilename; /* for -outfile switch */
public static void Main(string[] args)
{
progname = Path.GetFileName(Environment.GetCommandLineArgs()[0]);
cd_jpeg_error_mgr err = new cd_jpeg_error_mgr();
jpeg_compress_struct cinfo = new jpeg_compress_struct(err);
/* Initialize JPEG parameters.
* Much of this may be overridden later.
* In particular, we don't yet know the input file's color space,
* but we need to provide some value for jpeg_set_defaults() to work.
*/
cinfo.In_color_space = J_COLOR_SPACE.JCS_RGB; /* arbitrary guess */
cinfo.jpeg_set_defaults();
/* Scan command line to find file names.
* It is convenient to use just one switch-parsing routine, but the switch
* values read here are ignored; we will rescan the switches after opening
* the input file.
*/
int file_index;
if (!parse_switches(cinfo, args, false, out file_index))
{
usage();
return;
}
/* Must have either -outfile switch or explicit output file name */
if (outfilename == null)
{
// file_index should point to input file
if (file_index != args.Length - 2)
{
Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname));
usage();
return;
}
// output file comes right after input one
outfilename = args[file_index + 1];
}
else
{
// file_index should point to input file
if (file_index != args.Length - 1)
{
Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname));
usage();
return;
}
}
/* Open the input file. */
FileStream input_file = null;
if (file_index < args.Length)
{
try
{
input_file = new FileStream(args[file_index], FileMode.Open);
}
catch (Exception e)
{
Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index]));
Console.WriteLine(e.Message);
return;
}
}
else
{
Console.WriteLine(string.Format("{0}: sorry, can't read file from console"));
return;
}
/* Open the output file. */
FileStream output_file = null;
if (outfilename != null)
{
try
{
output_file = new FileStream(outfilename, FileMode.Create);
}
catch (Exception e)
{
Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index]));
Console.WriteLine(e.Message);
return;
}
}
else
{
Console.WriteLine(string.Format("{0}: sorry, can't write file to console"));
return;
}
/* Figure out the input file format, and set up to read it. */
cjpeg_source_struct src_mgr = new bmp_source_struct(cinfo);
src_mgr.input_file = input_file;
/* Read the input file header to obtain file size & colorspace. */
src_mgr.start_input();
/* Now that we know input colorspace, fix colorspace-dependent defaults */
cinfo.jpeg_default_colorspace();
/* Adjust default compression parameters by re-parsing the options */
parse_switches(cinfo, args, true, out file_index);
/* Specify data destination for compression */
cinfo.jpeg_stdio_dest(output_file);
/* Start compressor */
cinfo.jpeg_start_compress(true);
/* Process data */
while (cinfo.Next_scanline < cinfo.Image_height)
{
int num_scanlines = src_mgr.get_pixel_rows();
cinfo.jpeg_write_scanlines(src_mgr.buffer, num_scanlines);
}
/* Finish compression and release memory */
src_mgr.finish_input();
cinfo.jpeg_finish_compress();
/* Close files, if we opened them */
input_file.Close();
input_file.Dispose();
output_file.Close();
output_file.Dispose();
/* All done. */
if (cinfo.Err.Num_warnings != 0)
Console.WriteLine("Corrupt-data warning count is not zero");
}
/// <summary>
/// Parse optional switches.
/// Returns true if switches were parsed successfully; false otherwise.
/// fileIndex receives index of first file-name argument (== -1 if none).
/// for_real is false on the first (dummy) pass; we may skip any expensive
/// processing.
/// </summary>
static bool parse_switches(jpeg_compress_struct cinfo, string[] argv, bool for_real, out int fileIndex)
{
/* Set up default JPEG parameters. */
/* Note that default -quality level need not, and does not,
* match the default scaling for an explicit -qtables argument.
*/
int quality = 75; /* default -quality value */
int q_scale_factor = 100; /* default to no scaling for -qtables */
bool force_baseline = false; /* by default, allow 16-bit quantizers */
bool simple_progressive = false;
string qtablefile = null; /* saves -qtables filename if any */
string qslotsarg = null; /* saves -qslots parm if any */
string samplearg = null; /* saves -sample parm if any */
outfilename = null;
fileIndex = -1;
cinfo.Err.Trace_level = 0;
/* Scan command line options, adjust parameters */
int argn = 0;
for ( ; argn < argv.Length; argn++)
{
string arg = argv[argn];
if (string.IsNullOrEmpty(arg) || arg[0] != '-')
{
/* Not a switch, must be a file name argument */
fileIndex = argn;
break;
}
arg = arg.Substring(1);
if (cdjpeg_utils.keymatch(arg, "baseline", 1))
{
/* Force baseline-compatible output (8-bit quantizer values). */
force_baseline = true;
}
else if (cdjpeg_utils.keymatch(arg, "dct", 2))
{
/* Select DCT algorithm. */
argn++; /* advance to next argument */
if (argn >= argv.Length)
return false;
if (cdjpeg_utils.keymatch(argv[argn], "int", 1))
cinfo.Dct_method = J_DCT_METHOD.JDCT_ISLOW;
else if (cdjpeg_utils.keymatch(argv[argn], "fast", 2))
cinfo.Dct_method = J_DCT_METHOD.JDCT_IFAST;
else if (cdjpeg_utils.keymatch(argv[argn], "float", 2))
cinfo.Dct_method = J_DCT_METHOD.JDCT_FLOAT;
else
return false;
}
else if (cdjpeg_utils.keymatch(arg, "debug", 1) || cdjpeg_utils.keymatch(arg, "verbose", 1))
{
/* Enable debug printouts. */
/* On first -d, print version identification */
if (!printed_version)
{
Console.Write(string.Format("Bit Miracle's CJPEG, version {0}\n{1}\n", jpeg_common_struct.Version, jpeg_common_struct.Copyright));
printed_version = true;
}
cinfo.Err.Trace_level++;
}
else if (cdjpeg_utils.keymatch(arg, "grayscale", 2) || cdjpeg_utils.keymatch(arg, "greyscale", 2))
{
/* Force a monochrome JPEG file to be generated. */
cinfo.jpeg_set_colorspace(J_COLOR_SPACE.JCS_GRAYSCALE);
}
else if (cdjpeg_utils.keymatch(arg, "optimize", 1) || cdjpeg_utils.keymatch(arg, "optimise", 1))
{
/* Enable entropy parm optimization. */
cinfo.Optimize_coding = true;
}
else if (cdjpeg_utils.keymatch(arg, "outfile", 4))
{
/* Set output file name. */
argn++;/* advance to next argument */
if (argn >= argv.Length)
return false;
outfilename = argv[argn]; /* save it away for later use */
}
else if (cdjpeg_utils.keymatch(arg, "progressive", 1))
{
/* Select simple progressive mode. */
simple_progressive = true;
/* We must postpone execution until num_components is known. */
}
else if (cdjpeg_utils.keymatch(arg, "quality", 1))
{
/* Quality factor (quantization table scaling factor). */
argn++;/* advance to next argument */
if (argn >= argv.Length)
return false;
try
{
quality = int.Parse(argv[argn]);
/* Change scale factor in case -qtables is present. */
q_scale_factor = jpeg_compress_struct.jpeg_quality_scaling(quality);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return false;
}
}
else if (cdjpeg_utils.keymatch(arg, "qslots", 2))
{
/* Quantization table slot numbers. */
argn++; /* advance to next argument */
if (argn >= argv.Length)
return false;
qslotsarg = argv[argn];
/* Must delay setting qslots until after we have processed any
* colorspace-determining switches, since jpeg_set_colorspace sets
* default quant table numbers.
*/
}
else if (cdjpeg_utils.keymatch(arg, "qtables", 2))
{
/* Quantization tables fetched from file. */
argn++; /* advance to next argument */
if (argn >= argv.Length)
return false;
qtablefile = argv[argn];
/* We postpone actually reading the file in case -quality comes later. */
}
else if (cdjpeg_utils.keymatch(arg, "restart", 1))
{
/* Restart interval in MCU rows (or in MCUs with 'b'). */
argn++; /* advance to next argument */
if (argn >= argv.Length)
return false;
bool inBlocks = false;
if (argv[argn].EndsWith("b") || argv[argn].EndsWith("B"))
inBlocks = true;
string parsee = argv[argn];
if (inBlocks)
parsee = parsee.Remove(parsee.Length - 1);
try
{
int val = int.Parse(parsee);
if (val < 0 || val > 65535)
return false;
if (inBlocks)
{
cinfo.Restart_interval = val;
cinfo.Restart_in_rows = 0; /* else prior '-restart n' overrides me */
}
else
{
cinfo.Restart_in_rows = val;
/* restart_interval will be computed during startup */
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return false;
}
}
else if (cdjpeg_utils.keymatch(arg, "sample", 2))
{
/* Set sampling factors. */
argn++; /* advance to next argument */
if (argn >= argv.Length)
return false;
samplearg = argv[argn];
/* Must delay setting sample factors until after we have processed any
* colorspace-determining switches, since jpeg_set_colorspace sets
* default sampling factors.
*/
}
else if (cdjpeg_utils.keymatch(arg, "smooth", 2))
{
/* Set input smoothing factor. */
argn++; /* advance to next argument */
if (argn >= argv.Length)
return false;
try
{
int val = int.Parse(argv[argn]);
if (val < 0 || val > 100)
return false;
cinfo.Smoothing_factor = val;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return false;
}
}
else
{
/* bogus switch */
return false;
}
}
/* Post-switch-scanning cleanup */
if (for_real)
{
/* Set quantization tables for selected quality. */
/* Some or all may be overridden if -qtables is present. */
cinfo.jpeg_set_quality(quality, force_baseline);
if (qtablefile != null) /* process -qtables if it was present */
{
if (!read_quant_tables(cinfo, qtablefile, q_scale_factor, force_baseline))
return false;
}
if (qslotsarg != null) /* process -qslots if it was present */
{
if (!set_quant_slots(cinfo, qslotsarg))
return false;
}
if (samplearg != null) /* process -sample if it was present */
{
if (!set_sample_factors(cinfo, samplearg))
return false;
}
if (simple_progressive) /* process -progressive; -scans can override */
cinfo.jpeg_simple_progression();
}
return true;
}
