private bool m_on_odd_row; /* flag to remember which row we are on */
/// <summary>
/// Module initialization routine for 1-pass color quantization.
/// </summary>
/// <param name="cinfo">The cinfo.</param>
public My1PassCQuantizer(JpegDecompressStruct cinfo)
{
m_cinfo = cinfo;
m_fserrors[0] = null; /* Flag FS workspace not allocated */
m_odither[0] = null; /* Also flag odither arrays not allocated */
/* Make sure my internal arrays won't overflow */
if (cinfo.outColorComponents > MAX_Q_COMPS)
{
cinfo.ErrExit(JMessageCode.JERR_QUANT_COMPONENTS, MAX_Q_COMPS);
}
/* Make sure colormap indexes can be represented by JSAMPLEs */
if (cinfo.desiredNumberOfColors > (JpegConstants.MAXJSAMPLE + 1))
{
cinfo.ErrExit(JMessageCode.JERR_QUANT_MANY_COLORS, JpegConstants.MAXJSAMPLE + 1);
}
/* Create the colormap and color index table. */
CreateColormap();
CreateColorIndex();
/* Allocate Floyd-Steinberg workspace now if requested.
* We do this now since it is FAR storage and may affect the memory
* manager's space calculations. If the user changes to FS dither
* mode in a later pass, we will allocate the space then, and will
* possibly overrun the max_memory_to_use setting.
*/
if (cinfo.ditherMode == JDitherMode.JDITHER_FS)
{
AllocFsWorkspace();
}
}
/// <summary>
/// Initialize for a processing pass.
/// </summary>
public void StartPass(JBufMode pass_mode)
{
switch (pass_mode)
{
case JBufMode.PassThrough:
if (m_cinfo.m_upsample.NeedContextRows())
{
m_dataProcessor = DataProcessor.context_main;
MakeFunnyPointers(); /* Create the xbuffer[] lists */
m_whichFunny = 0; /* Read first iMCU row into xbuffer[0] */
m_context_state = CTX_PREPARE_FOR_IMCU;
m_iMCU_row_ctr = 0;
}
else
{
/* Simple case with no context needed */
m_dataProcessor = DataProcessor.simple_main;
}
m_buffer_full = false; /* Mark buffer empty */
m_rowgroup_ctr = 0;
break;
case JBufMode.CrankDest:
/* For last pass of 2-pass quantization, just crank the postprocessor */
m_dataProcessor = DataProcessor.crank_post;
break;
default:
m_cinfo.ErrExit(JMessageCode.JERR_BAD_BUFFER_MODE);
break;
}
}
/// <summary>
/// Initialize for a processing pass.
/// </summary>
public void StartPass(JBufMode pass_mode)
{
switch (pass_mode)
{
case JBufMode.PassThrough:
if (m_cinfo.quantizeColors)
{
/* Single-pass processing with color quantization. */
m_processor = ProcessorType.OnePass;
/* We could be doing buffered-image output before starting a 2-pass
* color quantization; in that case, jinit_d_post_controller did not
* allocate a strip buffer. Use the virtual-array buffer as workspace.
*/
if (m_buffer is null)
{
m_buffer = m_whole_image.Access(0, m_strip_height);
}
}
else
{
/* For single-pass processing without color quantization,
* I have no work to do; just call the upsampler directly.
*/
m_processor = ProcessorType.Upsample;
}
break;
case JBufMode.SaveAndPass:
/* First pass of 2-pass quantization */
if (m_whole_image is null)
{
m_cinfo.ErrExit(JMessageCode.JERR_BAD_BUFFER_MODE);
}
m_processor = ProcessorType.PrePass;
break;
case JBufMode.CrankDest:
/* Second pass of 2-pass quantization */
if (m_whole_image is null)
{
m_cinfo.ErrExit(JMessageCode.JERR_BAD_BUFFER_MODE);
}
m_processor = ProcessorType.SecondPass;
break;
default:
m_cinfo.ErrExit(JMessageCode.JERR_BAD_BUFFER_MODE);
break;
}
m_starting_row = m_next_row = 0;
}
private int m_iMCU_row_ctr; /* counts iMCU rows to detect image top/bot */
public JpegDMainController(JpegDecompressStruct cinfo)
{
m_cinfo = cinfo;
/* Allocate the workspace.
* ngroups is the number of row groups we need.
*/
var ngroups = cinfo.min_DCT_v_scaled_size;
if (cinfo.m_upsample.NeedContextRows())
{
if (cinfo.min_DCT_v_scaled_size < 2) /* unsupported, see comments above */
{
cinfo.ErrExit(JMessageCode.JERR_NOTIMPL);
}
AllocFunnyPointers(); /* Alloc space for xbuffer[] lists */
ngroups = cinfo.min_DCT_v_scaled_size + 2;
}
for (var ci = 0; ci < cinfo.numComponents; ci++)
{
/* height of a row group of component */
var rgroup = (cinfo.CompInfo[ci].V_samp_factor * cinfo.CompInfo[ci].DCT_v_scaled_size) / cinfo.min_DCT_v_scaled_size;
m_buffer[ci] = JpegCommonStruct.AllocJpegSamples(
cinfo.CompInfo[ci].Width_in_blocks * cinfo.CompInfo[ci].DCT_h_scaled_size,
rgroup * ngroups);
}
}
private void UpSampleComponent(ref ComponentBuffer input_data)
{
switch (m_upsampleMethods[m_currentComponent])
{
case ComponentUpsampler.noop_upsampler:
NoOpUpSample();
break;
case ComponentUpsampler.fullsize_upsampler:
FullSizeUpSample(ref input_data);
break;
case ComponentUpsampler.h2v1_upsampler:
H2V1UpSample(ref input_data);
break;
case ComponentUpsampler.h2v2_upsampler:
H2V2UpSample(ref input_data);
break;
case ComponentUpsampler.int_upsampler:
IntUpSample(ref input_data);
break;
default:
m_cinfo.ErrExit(JMessageCode.JERR_NOTIMPL);
break;
}
}
public ReadResult DecompressData(ComponentBuffer[] output_buf)
{
switch (m_decompressor)
{
case DecompressorType.Ordinary:
return(DecompressDataOrdinary(output_buf));
case DecompressorType.Smooth:
return(DecompressSmoothData(output_buf));
case DecompressorType.OnePass:
return(DecompressOnePass(output_buf));
}
m_cinfo.ErrExit(JMessageCode.JERR_NOTIMPL);
return(0);
}
/// <summary>
/// <para>Fill the input buffer - called whenever buffer is emptied.</para>
/// <para>
/// In typical applications, this should read fresh data into the buffer
/// (ignoring the current state of next_input_byte and bytes_in_buffer),
/// reset the pointer and count to the start of the buffer, and return true
/// indicating that the buffer has been reloaded. It is not necessary to
/// fill the buffer entirely, only to obtain at least one more byte.
/// </para>
/// <para>
/// There is no such thing as an EOF return. If the end of the file has been
/// reached, the routine has a choice of ERREXIT() or inserting fake data into
/// the buffer. In most cases, generating a warning message and inserting a
/// fake EOI marker is the best course of action --- this will allow the
/// decompressor to output however much of the image is there. However,
/// the resulting error message is misleading if the real problem is an empty
/// input file, so we handle that case specially.
/// </para>
/// <para>
/// In applications that need to be able to suspend compression due to input
/// not being available yet, a false return indicates that no more data can be
/// obtained right now, but more may be forthcoming later. In this situation,
/// the decompressor will return to its caller (with an indication of the
/// number of scanlines it has read, if any). The application should resume
/// decompression after it has loaded more data into the input buffer. Note
/// that there are substantial restrictions on the use of suspension --- see
/// the documentation.
/// </para>
/// <para>
/// When suspending, the decompressor will back up to a convenient restart point
/// (typically the start of the current MCU). next_input_byte and bytes_in_buffer
/// indicate where the restart point will be if the current call returns false.
/// Data beyond this point must be rescanned after resumption, so move it to
/// the front of the buffer rather than discarding it.
/// </para>
/// </summary>
public override bool FillInputBuffer()
{
var nbytes = m_infile.Read(m_buffer, 0, INPUT_BUF_SIZE);
if (nbytes <= 0)
{
if (m_start_of_file) /* Treat empty input file as fatal error */
{
m_cinfo.ErrExit(JMessageCode.JERR_INPUT_EMPTY);
}
m_cinfo.WarnMS(JMessageCode.JWRN_JPEG_EOF);
/* Insert a fake EOI marker */
m_buffer[0] = 0xFF;
m_buffer[1] = (byte)JpegMarker.EOI;
nbytes = 2;
}
InitInternalBuffer(m_buffer, nbytes);
m_start_of_file = false;
return(true);
}
public ArithEntropyDecoder(JpegDecompressStruct cinfo)
{
cinfo.ErrExit(JMessageCode.JERR_NOTIMPL);
}
/// <summary>
/// Per-pass setup.
/// This is called at the beginning of each output pass. We determine which
/// modules will be active during this pass and give them appropriate
/// start_pass calls. We also set is_dummy_pass to indicate whether this
/// is a "real" output pass or a dummy pass for color quantization.
/// (In the latter case, we will crank the pass to completion.)
/// </summary>
public void PrepareForOutputPass()
{
if (m_is_dummy_pass)
{
/* Final pass of 2-pass quantization */
m_is_dummy_pass = false;
m_cinfo.m_cquantize.StartPass(false);
m_cinfo.m_post.StartPass(JBufMode.CrankDest);
m_cinfo.m_main.StartPass(JBufMode.CrankDest);
}
else
{
if (m_cinfo.quantizeColors && m_cinfo.m_colormap is null)
{
/* Select new quantization method */
if (m_cinfo.twoPassQuantize && m_cinfo.enable2PassQuant)
{
m_cinfo.m_cquantize = m_quantizer_2pass;
m_is_dummy_pass = true;
}
else if (m_cinfo.enable1PassQuant)
{
m_cinfo.m_cquantize = m_quantizer_1pass;
}
else
{
m_cinfo.ErrExit(JMessageCode.JERR_MODE_CHANGE);
}
}
m_cinfo.m_idct.StartPass();
m_cinfo.m_coef.StartOutputPass();
if (!m_cinfo.rawDataOut)
{
m_cinfo.m_upsample.StartPass();
if (m_cinfo.quantizeColors)
{
m_cinfo.m_cquantize.StartPass(m_is_dummy_pass);
}
m_cinfo.m_post.StartPass(m_is_dummy_pass ? JBufMode.SaveAndPass : JBufMode.PassThrough);
m_cinfo.m_main.StartPass(JBufMode.PassThrough);
}
}
/* Set up progress monitor's pass info if present */
if (m_cinfo.prog is object)
{
m_cinfo.prog.CompletedPasses = m_pass_number;
m_cinfo.prog.TotalPasses = m_pass_number + (m_is_dummy_pass ? 2 : 1);
/* In buffered-image mode, we assume one more output pass if EOI not
* yet reached, but no more passes if EOI has been reached.
*/
if (m_cinfo.bufferedImage && !m_cinfo.m_inputctl.EOIReached())
{
m_cinfo.prog.TotalPasses += (m_cinfo.enable2PassQuant ? 2 : 1);
}
}
}
private int[] rgb_y_tab; /* => table for RGB to Y conversion */
/// <summary>
/// Module initialization routine for output colorspace conversion.
/// </summary>
public JpegColorDeconverter(JpegDecompressStruct cinfo)
{
m_cinfo = cinfo;
/* Make sure num_components agrees with jpeg_color_space */
switch (cinfo.jpegColorSpace)
{
case JColorSpace.JCS_GRAYSCALE:
if (cinfo.numComponents != 1)
{
cinfo.ErrExit(JMessageCode.JERR_BAD_J_COLORSPACE);
}
break;
case JColorSpace.JCS_RGB:
case JColorSpace.JCS_YCbCr:
case JColorSpace.JCS_BG_RGB:
case JColorSpace.JCS_BG_YCC:
if (cinfo.numComponents != 3)
{
cinfo.ErrExit(JMessageCode.JERR_BAD_J_COLORSPACE);
}
break;
case JColorSpace.JCS_CMYK:
case JColorSpace.JCS_YCCK:
if (cinfo.numComponents != 4)
{
cinfo.ErrExit(JMessageCode.JERR_BAD_J_COLORSPACE);
}
break;
case JColorSpace.JCS_NCHANNEL:
if (cinfo.numComponents < 1)
{
cinfo.ErrExit(JMessageCode.JERR_BAD_J_COLORSPACE);
}
break;
default:
/* JCS_UNKNOWN can be anything */
if (cinfo.numComponents < 1)
{
cinfo.ErrExit(JMessageCode.JERR_BAD_J_COLORSPACE);
}
break;
}
/* Support color transform only for RGB colorspaces */
if (cinfo.color_transform != JColorTransform.JCT_NONE &&
cinfo.jpegColorSpace != JColorSpace.JCS_RGB &&
cinfo.jpegColorSpace != JColorSpace.JCS_BG_RGB)
{
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
}
/* Set out_color_components and conversion method based on requested space.
* Also clear the component_needed flags for any unused components,
* so that earlier pipeline stages can avoid useless computation.
*/
switch (cinfo.outColorSpace)
{
case JColorSpace.JCS_GRAYSCALE:
cinfo.outColorComponents = 1;
switch (cinfo.jpegColorSpace)
{
case JColorSpace.JCS_GRAYSCALE:
case JColorSpace.JCS_YCbCr:
case JColorSpace.JCS_BG_YCC:
m_converter = GrayscaleConvert;
/* For color->grayscale conversion, only the Y (0) component is needed */
for (var ci = 1; ci < cinfo.numComponents; ci++)
{
cinfo.CompInfo[ci].component_needed = false;
}
break;
case JColorSpace.JCS_RGB:
switch (cinfo.color_transform)
{
case JColorTransform.JCT_NONE:
m_converter = RgbGrayConvert;
break;
case JColorTransform.JCT_SUBTRACT_GREEN:
m_converter = Rgb1GrayConvert;
break;
default:
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
break;
}
BuildRgbYTable();
break;
default:
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
break;
}
break;
case JColorSpace.JCS_RGB:
cinfo.outColorComponents = JpegConstants.RGB_PIXELSIZE;
switch (cinfo.jpegColorSpace)
{
case JColorSpace.JCS_GRAYSCALE:
m_converter = GrayRgbConvert;
break;
case JColorSpace.JCS_YCbCr:
m_converter = YccRgbConvert;
BuildYccRgbTable();
break;
case JColorSpace.JCS_BG_YCC:
m_converter = YccRgbConvert;
BuildBgYccRgbTable();
break;
case JColorSpace.JCS_RGB:
switch (cinfo.color_transform)
{
case JColorTransform.JCT_NONE:
m_converter = RgbConvert;
break;
case JColorTransform.JCT_SUBTRACT_GREEN:
m_converter = Rgb1RgbConvert;
break;
default:
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
break;
}
break;
case JColorSpace.JCS_CMYK:
m_converter = CmykRgbConvert;
break;
case JColorSpace.JCS_YCCK:
m_converter = YcckRgbConvert;
BuildYccRgbTable();
break;
default:
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
break;
}
break;
case JColorSpace.JCS_BG_RGB:
cinfo.outColorComponents = JpegConstants.RGB_PIXELSIZE;
if (cinfo.jpegColorSpace == JColorSpace.JCS_BG_RGB)
{
switch (cinfo.color_transform)
{
case JColorTransform.JCT_NONE:
m_converter = RgbConvert;
break;
case JColorTransform.JCT_SUBTRACT_GREEN:
m_converter = Rgb1RgbConvert;
break;
default:
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
break;
}
}
else
{
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
}
break;
case JColorSpace.JCS_CMYK:
cinfo.outColorComponents = 4;
switch (cinfo.jpegColorSpace)
{
case JColorSpace.JCS_YCCK:
m_converter = YcckCmykConvert;
BuildYccRgbTable();
break;
case JColorSpace.JCS_CMYK:
m_converter = NullConvert;
break;
default:
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
break;
}
break;
case JColorSpace.JCS_NCHANNEL:
if (cinfo.jpegColorSpace == JColorSpace.JCS_NCHANNEL)
{
m_converter = NullConvert;
}
else
{
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
}
break;
default:
/* Permit null conversion to same output space */
if (cinfo.outColorSpace == cinfo.jpegColorSpace)
{
cinfo.outColorComponents = cinfo.numComponents;
m_converter = NullConvert;
}
else
{
/* unsupported non-null conversion */
cinfo.ErrExit(JMessageCode.JERR_CONVERSION_NOTIMPL);
}
break;
}
if (cinfo.quantizeColors)
{
cinfo.outputComponents = 1; /* single colormapped output component */
}
else
{
cinfo.outputComponents = cinfo.outColorComponents;
}
}
public MyUpSampler(JpegDecompressStruct cinfo)
{
m_cinfo = cinfo;
m_need_context_rows = false; /* until we find out differently */
if (cinfo.m_CCIR601_sampling) /* this isn't supported */
{
cinfo.ErrExit(JMessageCode.JERR_CCIR601_NOTIMPL);
}
/* Verify we can handle the sampling factors, select per-component methods,
* and create storage as needed.
*/
for (var ci = 0; ci < cinfo.numComponents; ci++)
{
var componentInfo = cinfo.CompInfo[ci];
/* Compute size of an "input group" after IDCT scaling. This many samples
* are to be converted to max_h_samp_factor * max_v_samp_factor pixels.
*/
var h_in_group = (componentInfo.H_samp_factor * componentInfo.DCT_h_scaled_size) / cinfo.min_DCT_h_scaled_size;
var v_in_group = (componentInfo.V_samp_factor * componentInfo.DCT_v_scaled_size) / cinfo.min_DCT_v_scaled_size;
var h_out_group = cinfo.m_max_h_samp_factor;
var v_out_group = cinfo.m_maxVSampleFactor;
/* save for use later */
m_rowgroup_height[ci] = v_in_group;
if (!componentInfo.component_needed)
{
/* Don't bother to upsample an uninteresting component. */
m_upsampleMethods[ci] = ComponentUpsampler.noop_upsampler;
continue; /* don't need to allocate buffer */
}
if (h_in_group == h_out_group && v_in_group == v_out_group)
{
/* Fullsize components can be processed without any work. */
m_upsampleMethods[ci] = ComponentUpsampler.fullsize_upsampler;
continue; /* don't need to allocate buffer */
}
if (h_in_group * 2 == h_out_group && v_in_group == v_out_group)
{
/* Special case for 2h1v upsampling */
m_upsampleMethods[ci] = ComponentUpsampler.h2v1_upsampler;
}
else if (h_in_group * 2 == h_out_group && v_in_group * 2 == v_out_group)
{
/* Special case for 2h2v upsampling */
m_upsampleMethods[ci] = ComponentUpsampler.h2v2_upsampler;
}
else if ((h_out_group % h_in_group) == 0 && (v_out_group % v_in_group) == 0)
{
/* Generic integral-factors upsampling method */
m_upsampleMethods[ci] = ComponentUpsampler.int_upsampler;
m_h_expand[ci] = (byte)(h_out_group / h_in_group);
m_v_expand[ci] = (byte)(v_out_group / v_in_group);
}
else
{
cinfo.ErrExit(JMessageCode.JERR_FRACT_SAMPLE_NOTIMPL);
}
var cb = new ComponentBuffer();
cb.SetBuffer(JpegCommonStruct.AllocJpegSamples(JpegUtils.jround_up(cinfo.outputWidth,
cinfo.m_max_h_samp_factor), cinfo.m_maxVSampleFactor), null, 0);
m_color_buf[ci] = cb;
}
}
/// <summary>
/// Initialize for one-pass color quantization.
/// </summary>
public virtual void StartPass(bool is_pre_scan)
{
/* Install my colormap. */
m_cinfo.m_colormap = m_sv_colormap;
m_cinfo.actualColorCount = m_sv_actual;
/* Initialize for desired dithering mode. */
switch (m_cinfo.ditherMode)
{
case JDitherMode.JDITHER_NONE:
if (m_cinfo.outColorComponents == 3)
{
m_quantizer = QuantizerType.color_quantizer3;
}
else
{
m_quantizer = QuantizerType.color_quantizer;
}
break;
case JDitherMode.JDITHER_ORDERED:
if (m_cinfo.outColorComponents == 3)
{
m_quantizer = QuantizerType.quantize3_ord_dither_quantizer;
}
else
{
m_quantizer = QuantizerType.quantize_ord_dither_quantizer;
}
/* initialize state for ordered dither */
m_row_index = 0;
/* If user changed to ordered dither from another mode,
* we must recreate the color index table with padding.
* This will cost extra space, but probably isn't very likely.
*/
if (!m_is_padded)
{
CreateColorIndex();
}
/* Create ordered-dither tables if we didn't already. */
if (m_odither[0] is null)
{
CreateODitherTable();
}
break;
case JDitherMode.JDITHER_FS:
m_quantizer = QuantizerType.quantize_fs_dither_quantizer;
/* initialize state for F-S dither */
m_on_odd_row = false;
/* Allocate Floyd-Steinberg workspace if didn't already. */
if (m_fserrors[0] is null)
{
AllocFsWorkspace();
}
/* Initialize the propagated errors to zero. */
var arraysize = m_cinfo.outputWidth + 2;
for (var i = 0; i < m_cinfo.outColorComponents; i++)
{
Array.Clear(m_fserrors[i], 0, arraysize);
}
break;
default:
m_cinfo.ErrExit(JMessageCode.JERR_NOT_COMPILED);
break;
}
}
/// <summary>
/// <para>
/// Read JPEG markers before, between, or after compressed-data scans.
/// Change state as necessary when a new scan is reached.
/// Return value is JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
/// </para>
/// <para>
/// The consume_input method pointer points either here or to the
/// coefficient controller's consume_data routine, depending on whether
/// we are reading a compressed data segment or inter-segment markers.
/// </para>
/// <para>
/// Note: This function should NOT return a pseudo SOS marker(with zero
/// component number) to the caller.A pseudo marker received by
/// read_markers is processed and then skipped for other markers.
/// </para>
/// </summary>
private ReadResult ConsumeMarkers()
{
ReadResult val;
if (m_eoi_reached) /* After hitting EOI, read no further */
{
return(ReadResult.JPEG_REACHED_EOI);
}
/* Loop to pass pseudo SOS marker */
for (; ;)
{
val = m_cinfo.m_marker.ReadMarkers();
switch (val)
{
case ReadResult.JPEG_REACHED_SOS:
/* Found SOS */
if (m_inheaders != 0)
{
/* 1st SOS */
if (m_inheaders == 1)
{
InitialSetup();
}
if (m_cinfo.m_comps_in_scan == 0)
{
/* pseudo SOS marker */
m_inheaders = 2;
break;
}
m_inheaders = 0;
/* Note: start_input_pass must be called by jpeg_decomp_master
* before any more input can be consumed.
*/
}
else
{
/* 2nd or later SOS marker */
if (!m_has_multiple_scans)
{
/* Oops, I wasn't expecting this! */
m_cinfo.ErrExit(JMessageCode.JERR_EOI_EXPECTED);
}
if (m_cinfo.m_comps_in_scan == 0)
{
/* unexpected pseudo SOS marker */
break;
}
m_cinfo.m_inputctl.StartInputPass();
}
return(val);
case ReadResult.JPEG_REACHED_EOI:
/* Found EOI */
m_eoi_reached = true;
if (m_inheaders != 0)
{
/* Tables-only datastream, apparently */
if (m_cinfo.m_marker.SawSOF())
{
m_cinfo.ErrExit(JMessageCode.JERR_SOF_NO_SOS);
}
}
else
{
/* Prevent infinite loop in coef ctlr's decompress_data routine
* if user set output_scan_number larger than number of scans.
*/
if (m_cinfo.outputScanNumber > m_cinfo.inputScanNumber)
{
m_cinfo.outputScanNumber = m_cinfo.inputScanNumber;
}
}
return(val);
case ReadResult.JPEG_SUSPENDED:
default:
return(val);
}
}
}
