GetRowCompressed(IntPtr,IntPtr,int,int) Method

Summary

Retrieves (into an unmanaged memory buffer) one or more rows of 1-bit compressed data from an image that has been loaded in its compressed format.

Syntax

C++/CLI

Java

Python

public void GetRowCompressed( 
   IntPtr workBuffer, 
   IntPtr runBuffer, 
   int row, 
   int lines 
)

public void getRowCompressed( 
  byte[] workBuffer,  
  short[] runBuffer,  
  int row,  
  int lines 
)

public: 
void GetRowCompressed(  
   IntPtr workBuffer, 
   IntPtr runBuffer, 
   int row, 
   int lines 
)

def GetRowCompressed(self,workBuffer,runBuffer,row,lines):

Parameters

workBuffer
Pointer to optional work unmanaged memory buffer. Allocating the work buffer speeds processing if you call this method more than once, because if you do not allocate a work buffer, the method allocates and frees a temporary buffer each time it is called. bytes required = lines * ((RasterImage-Width.html) + 3) * 2). Pass IntPtr.Zero for workBuffer if you do not want to use the work buffer

runBuffer
Pointer to the output unmanaged memory buffer, which will be filled with 1-bit compressed image data.

row
The number of the row to retrieve. The first row is 0, and the last row is 1 less than the image height.

lines
Number of rows to retrieve.

Remarks

This method is available in the (Document/Medical only) Toolkits.

This method 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.

Example

This example demonstrates the low-level methods for accessing 1-bit compressed image data. It demonstrates the ability to get and put rows, and the ability to process rows in buffer-to-buffer processing. The result of the function is an the first 50 lines are inverted.

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

Overload List

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Help Version 23.0.2024.5.22

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies