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StopDecompress Method

Summary
Ends the decompression process and cleans up all the variables and buffers allocated.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public RasterImage StopDecompress( 
   object decompressContext 
) 
- (nullable LTRasterImage *)stopDecompress:(NSObject *)decompressContext error:(NSError **)error 
public RasterImage stopDecompress(Object decompressContext) 
public: 
RasterImage^ StopDecompress(  
   Object^ decompressContext 
)  
def StopDecompress(self,decompressContext): 

Parameters

decompressContext
The decompressing context object obtained through StartDecompress.

Return Value

The RasterImage object created from decompressing the input image data.

Remarks

This method will end the decompression process and cleans up all the variables and buffers allocated by the StartDecompress and Decompress.

Call this method after the decompression of the entire image using Decompress.

Example
C#
Java
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
 
 
// This sample loads raw data from a PackBits TIF file 
// PackBits.tif is a 24-bit tif packbits compressed file 
// PackBits.tif has 46 strips of packbits data 
// The strip information is obtained by reading the TIF tags TAG_STRIPOFFSETS and TAG_STRIPBYTECOUNTS 
// The strips are directly read and fed to the Compress method 
void LoadRawPackbitsStrips(string packTifFile) 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Decompress.bmp"); 
 
   CodecsImageInfo imageInfo = codecs.GetInformation(packTifFile, false); 
 
   // StartDecompress 
   CodecsStartDecompressOptions options = CodecsStartDecompressOptions.Empty; 
   options.DataType = CodecsStartDecompressDataType.Strips; 
   options.Format = RasterImageFormat.RawPackBits; 
   options.Width = imageInfo.Width; 
   options.Height = imageInfo.Height; 
   options.BitsPerPixel = imageInfo.BitsPerPixel; 
   options.LeastSignificantBitFirst = false; 
   options.Pad4 = false; 
   options.PlanarConfiguration = CodecsPlanarConfiguration.PlanarFormat; 
   options.ViewPerspective = imageInfo.ViewPerspective; 
   options.RawOrder = imageInfo.Order; 
   options.LoadOrder = CodecsLoadByteOrder.BgrOrGray; 
   options.XResolution = imageInfo.XResolution; 
   options.YResolution = imageInfo.YResolution; 
   options.TiffPhotometricInterpretation = CodecsTiffPhotometricInterpretation.Rgb; 
   options.SetColorMask(options.GetColorMask()); 
   options.SetPalette(options.GetPalette()); 
   options.UsePalette = false; 
 
   object decompressObject = codecs.StartDecompress(options); 
 
   // Decompress 
 
   const int TAG_STRIPOFFSETS = 0x111; 
   const int TAG_STRIPBYTECOUNTS = 0x117; 
   const int TAG_ROWSPERSTRIP = 0x116; 
   const int MAX_STRIPS = 1000; 
 
   int[] stripOffsets = new int[MAX_STRIPS]; 
   int[] stripSizes = new int[MAX_STRIPS]; 
   int[] rowsPerStripBuffer = new int[1]; 
 
   int maxIndex = ReadTag(codecs, packTifFile, TAG_STRIPOFFSETS, stripOffsets); 
   ReadTag(codecs, packTifFile, TAG_STRIPBYTECOUNTS, stripSizes); 
   ReadTag(codecs, packTifFile, TAG_ROWSPERSTRIP, rowsPerStripBuffer); 
   int rowsPerStrip = rowsPerStripBuffer[0]; 
 
   FileStream fs = File.OpenRead(packTifFile); 
 
   const int row = 0; // Note: this parameter is ignored for strips 
   const int column = 0; // Column offset of tile 
   for (int index = 0; index < maxIndex; index++) 
   { 
      // seek to the first strip 
      fs.Seek(stripOffsets[index], SeekOrigin.Begin); 
 
      byte[] buffer = new byte[stripSizes[index]]; 
      fs.Read(buffer, 0, buffer.Length); 
 
      // Calculate the height of uncompressed strip/tile 
      int height = rowsPerStrip; 
      if (index == (maxIndex - 1)) 
      { 
         // fewer rows per strip 
         height = imageInfo.Height - (maxIndex - 1) * rowsPerStrip; 
      } 
 
      codecs.Decompress( 
         decompressObject, 
         buffer, 
         0, 
         buffer.Length, 
         imageInfo.Width, 
         height, 
         row, 
         column, 
         CodecsDecompressDataFlags.Complete); 
   } 
 
   fs.Close(); 
 
   // StopDecompress 
   RasterImage image = codecs.StopDecompress(decompressObject); 
 
   // 'image' contains the uncompressed image 
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
   image.Dispose(); 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
// Returns maximum index 
int ReadTag(RasterCodecs codecs, string fileName, int tagId, int[] stripArray) 
{ 
   RasterTagMetadata tag = codecs.ReadTag(fileName, 1, tagId); 
   int[] data = tag.ToInt32(); 
   data.CopyTo(stripArray, 0); 
   return tag.Count; 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
} 
 
import java.io.*; 
import java.net.*; 
import java.nio.file.Paths; 
import java.util.*; 
import java.time.Instant; 
import java.time.Duration; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.codecs.RasterCodecs.FeedCallbackThunk; 
import leadtools.drawing.internal.*; 
import leadtools.imageprocessing.*; 
import leadtools.imageprocessing.color.ChangeIntensityCommand; 
import leadtools.svg.*; 
 
 
// This sample loads raw data from a PackBits TIF file 
// PackBits.tif is a 24-bit tif packbits compressed file 
// PackBits.tif has 46 strips of packbits data 
// The strip information is obtained by reading the TIF tags TAG_STRIPOFFSETS 
// and TAG_STRIPBYTECOUNTS 
// The strips are directly read and fed to the Compress method 
public void loadRawPackbitsStripsExample() throws IOException { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   String packTifFile = combine(LEAD_VARS_IMAGES_DIR, "packbits.tif"); 
   RasterCodecs codecs = new RasterCodecs(); 
 
   String destFileName = combine(LEAD_VARS_IMAGES_DIR, "Decompress.bmp"); 
 
   CodecsImageInfo imageInfo = codecs.getInformation(packTifFile, false); 
 
   // StartDecompress 
   CodecsStartDecompressOptions options = CodecsStartDecompressOptions.getEmpty(); 
   options.setDataType(CodecsStartDecompressDataType.STRIPS); 
   options.setFormat(RasterImageFormat.RAW_PACKBITS); 
   options.setWidth(imageInfo.getWidth()); 
   options.setHeight(imageInfo.getHeight()); 
   options.setBitsPerPixel(imageInfo.getBitsPerPixel()); 
   options.setLeastSignificantBitFirst(false); 
   options.setPad4(false); 
   options.setPlanarConfiguration(CodecsPlanarConfiguration.PLANAR_FORMAT); 
   options.setViewPerspective(imageInfo.getViewPerspective()); 
   options.setRawOrder(imageInfo.getOrder()); 
   options.setLoadOrder(CodecsLoadByteOrder.BGR_OR_GRAY); 
   options.setXResolution(imageInfo.getXResolution()); 
   options.setYResolution(imageInfo.getYResolution()); 
   options.setTiffPhotometricInterpretation(CodecsTiffPhotometricInterpretation.RGB); 
   options.setColorMask(options.getColorMask()); 
   options.setPalette(options.getPalette()); 
   options.setUsePalette(false); 
 
   Object decompressObject = codecs.startDecompress(options); 
 
   // Decompress 
   final int TAG_STRIPOFFSETS = 0x111; 
   final int TAG_STRIPBYTECOUNTS = 0x117; 
   final int TAG_ROWSPERSTRIP = 0x116; 
   final int MAX_STRIPS = 1000; 
 
   int[] stripOffsets = new int[MAX_STRIPS]; 
   int[] stripSizes = new int[MAX_STRIPS]; 
   int[] rowsPerStripBuffer = new int[1]; 
 
   int maxIndex = readTag(codecs, packTifFile, TAG_STRIPOFFSETS, stripOffsets); 
   readTag(codecs, packTifFile, TAG_STRIPBYTECOUNTS, stripSizes); 
   readTag(codecs, packTifFile, TAG_ROWSPERSTRIP, rowsPerStripBuffer); 
   int rowsPerStrip = rowsPerStripBuffer[0]; 
 
   ILeadStream packTifStream = LeadStreamFactory.create(packTifFile); 
 
   final int row = 0; // Note: this parameter is ignored for strips 
   final int column = 0; // Column offset of tile 
   for (int index = 0; index < maxIndex; index++) { 
      // seek to the first strip 
      packTifStream.seek(LeadSeekOrigin.BEGIN, stripOffsets[index]); 
 
      byte[] buffer = new byte[stripSizes[index]]; 
      packTifStream.read(buffer, buffer.length); 
 
      // Calculate the height of uncompressed strip/tile 
      int height = rowsPerStrip; 
      if (index == (maxIndex - 1)) { 
         // fewer rows per strip 
         height = imageInfo.getHeight() - (maxIndex - 1) * rowsPerStrip; 
      } 
 
      codecs.decompress( 
            decompressObject, 
            buffer, 
            0, 
            buffer.length, 
            imageInfo.getWidth(), 
            height, 
            row, 
            column, 
            CodecsDecompressDataFlags.COMPLETE); 
   } 
 
   packTifStream.close(); 
 
   // StopDecompress 
   RasterImage image = codecs.stopDecompress(decompressObject); 
 
   // 'image' contains the uncompressed image 
   codecs.save(image, destFileName, RasterImageFormat.BMP, 24); 
   image.dispose(); 
 
   // Clean up 
   codecs.dispose(); 
} 
 
// Returns maximum index 
int readTag(RasterCodecs codecs, String fileName, int tagId, int[] stripArray) throws IOException { 
   ILeadStream fileStream = LeadStreamFactory.create(fileName); 
   RasterTagMetadata tag = codecs.readTag(fileStream, 1, tagId); 
   int[] data = tag.toInt32(); 
   for (int i = 0; i < data.length; i++) { 
      stripArray[i] = data[i]; 
   } 
   fileStream.close(); 
   return tag.getCount(); 
} 
Requirements

Target Platforms

Help Version 23.0.2024.2.29
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Leadtools.Codecs Assembly
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.