CodecsStartDecompressOptions Structure (original) (raw)
Syntax
C#
Objective-C
C++/CLI
Java
Python
public struct CodecsStartDecompressOptions @interface LTCodecsStartDecompressOptions : NSObject public final class CodecsStartDecompressOptions public value class CodecsStartDecompressOptions : public System.ValueType class CodecsStartDecompressOptions: Example
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:\LEADTOOLS22\Resources\Images";
}
Leadtools.Codecs Assembly
CompactFile(Stream,Stream,int,int,bool,int,int,bool,int,CodecsSavePageMode,bool,bool) Method
CompactFile(Stream,Stream,int,int,bool,long,int,bool,long,CodecsSavePageMode,bool,bool,bool) Method
CompactFile(string,string,int,int,bool,int,int,bool,int,CodecsSavePageMode,bool,bool) Method
CompactFile(string,string,int,int,bool,long,int,bool,long,CodecsSavePageMode,bool,bool,bool) Method