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CompressRow(ushort[],IntPtr,int,int) Method

Performs buffer-to-buffer RLE compression of unmanaged 1-bit image data.
public static void CompressRow( 
   ushort[] runBuffer, 
   IntPtr buffer, 
   int column, 
   int width 
static void CompressRow(  
   array<ushort>^ runBuffer, 
   IntPtr buffer, 
   int column, 
   int width 
def CompressRow(self,runBuffer,buffer,column,width): 


The output buffer, which will be filled with 1-bit compressed image data.

The unmanaged input buffer, which contains the 1-bit image data to be compressed.

Column offset within the row to be processed. The method skips this many pixels before it begins processing.

The number of pixels to process.


Use this method to process all or part of a single line of image data. This method is available in the Document/Medical Toolkits.

This function is useful for working with 1-bit images that are loaded in their compressed formats for faster loading and display. For more information, refer to Speeding Up 1-Bit Documents.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using Leadtools.Svg; 
public void GetRowColumnCompressedExample() 
	RasterCodecs codecs = new RasterCodecs(); 
	// Load the bitmap, at 1 bit per pixel, compressed 
	codecs.Options.Load.Compressed = true; 
	RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "OCR1.TIF"), 1, Leadtools.Codecs.CodecsLoadByteOrder.Bgr, 1, 1); 
	int xOffset;   // Column offset of the rectangle to process. 
	int xSize;     // Pixel width of the rectangle to process. 
	int yOffset;   // Row offset of the rectangle to process. 
	int ySize;     // Pixel height of the rectangle to process. 
	int i, n;       // Counters. 
	byte[] buffer;      // Buffer to hold the expanded row. 
	ushort[] runBuffer; // Buffer to hold the compressed row. 
	byte[] workBuffer;  // Work buffer. 
	// This example does not work with rotated view perspectives. 
	if ((image.ViewPerspective != RasterViewPerspective.TopLeft) || (image.ViewPerspective != RasterViewPerspective.BottomLeft)) 
	// Specify a rectangle in the middle right part of the displayed image. 
	xOffset = image.Width / 3; 
	xSize = image.Width - xOffset; 
	yOffset = image.Height / 3; 
	ySize = image.Height / 3; 
	// Adjust the YOffset if the view perspective is bottom left. 
	if (image.ViewPerspective == RasterViewPerspective.BottomLeft) 
		yOffset = image.Height - yOffset - ySize; 
	if (image.IsGlobalMemory) 
	// Allocate the buffers. 
	buffer = new Byte[(xSize + 7) / 8]; 
	runBuffer = new ushort[(xSize + 3) * 2]; 
	workBuffer = new Byte[image.BytesPerLine]; 
	// Invert the colors of pixels in the left half of the rectangle. 
	// Notice that we get the whole rectangle, but process only half of it. 
	for (i = yOffset; i < (yOffset + ySize); i++) 
		image.GetRowColumnCompressed(workBuffer, runBuffer, 0, i, xOffset, xSize); 
		RasterRleCompressor.ExpandRow(runBuffer, buffer, 0, 0, xSize); 
		for (n = 0; n < (xSize / 16); n++) 
			buffer[n] ^= 0xFF; 
		RasterRleCompressor.CompressRow(runBuffer, buffer, 0, 0, xSize); 
		image.SetRowColumnCompressed(workBuffer, runBuffer, 0, i, xOffset, xSize); 
	if (image.IsGlobalMemory) 
	codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_getrowcolcompresed.BMP"), RasterImageFormat.Bmp, 0); 
static class LEAD_VARS 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 

Target Platforms

Help Version 22.0.2023.5.16
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Leadtools Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.