StopCompress Method (original) (raw)
Summary
Cleans up all data variables and buffers allocated by the JPEG or LEAD CMP compression engine.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public void StopCompress() public void stopCompress() public:
void StopCompress();
Example
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
public void CompressExample()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_CompressData.cmp");
// Load the image to at 24-bits per pixel
RasterImage image = codecs.Load(srcFileName, 24, CodecsLoadByteOrder.Bgr, 1, 1);
if (image.ViewPerspective != RasterViewPerspective.TopLeft)
image.ChangeViewPerspective(RasterViewPerspective.TopLeft);
// Create the output file
_compressStream = File.Create(destFileName);
// Calculate the bytes per line in the input buffer, without padding
int lineBytes = image.Width * 3;
// Allocate a buffer for the incoming uncompressed data. Note that we
// are compressing 16 lines at a time. You should always use multiples of 16
byte[] inBuffer = new byte[16 * lineBytes];
// Allocate an output buffer. This is where the compressed data will
// go. Note that this allocates 1024-byte packets.
byte[] outBuffer = new byte[1024];
// Lock down the image
image.Access();
// Initialize the compression engine
codecs.Options.Jpeg.Save.CmpQualityFactorPredefined = CodecsCmpQualityFactorPredefined.QualityAndSize;
codecs.StartCompress(
image.Width,
image.Height,
image.BitsPerPixel,
image.Order,
image.ViewPerspective,
16 * lineBytes,
outBuffer,
0,
outBuffer.Length,
CodecsCompression.Cmp,
CodecsCompressDataCallback);
// Compress the data
int i = 0;
while (i < image.Height) // i is incremented at the end
{
// Compression of the 16-line chunk starts here
int j = 0;
int inBufferIndex = 0;
while ((i + j) < image.Height && j < 16)
{
// Get one line at time
image.GetRow(i + j, inBuffer, inBufferIndex, lineBytes);
// Move to next line
inBufferIndex += lineBytes;
j++;
}
// This is the main function that will do the actual Compression
codecs.Compress(inBuffer, 0);
i += 16;
}
// Reset the compression engine
codecs.StopCompress();
// Release the image and close the file
image.Release();
_compressStream.Close();
// Clean up
codecs.Dispose();
}
FileStream _compressStream;
byte[] _compressBuffer;
bool CodecsCompressDataCallback(int width, int height, int bitsPerPixel, RasterByteOrder order, RasterViewPerspective viewPerspective, RasterNativeBuffer buffer)
{
// Write data to the file
if (_compressBuffer == null || _compressBuffer.Length < buffer.Length)
_compressBuffer = new byte[(int)buffer.Length];
Marshal.Copy(buffer.Data, _compressBuffer, 0, (int)buffer.Length);
_compressStream.Write(_compressBuffer, 0, (int)buffer.Length);
return true;
}
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