Buffer Property

Summary

Gets the memory buffer containing one or more lines of output image data that the you must provide.

Syntax

Objective-C

C++/CLI

Java

Python

public RasterNativeBuffer Buffer { get; }

@property (nonatomic, assign, nullable) unsigned char *buffer;

RasterNativeBuffer getBuffer(); 
void setBuffer(RasterNativeBuffer value); 
             
 
 
 
public RasterNativeBuffer getBuffer()

public: 
property RasterNativeBuffer Buffer { 
   RasterNativeBuffer get(); 
}

Buffer # get  (CodecsSaveImageEventArgs)

Property Value

A RasterNativeBuffer object containing one or more lines of output image data that the you must provide.

Remarks

The Buffer property works as the input and output buffer containing the image data to save. If the value of RetrieveDataFromImage is set to false (the default), then the user is always responsible for providing the image data by setting in Buffer. If the value of RetrieveDataFromImage is set to true, then the RasterCodecs object will populate the Buffer prior to raising this event. The user can then inspect or modify the scanlines data or simple ignore it to save the original image data as is.

Notice that on either case, the user must provide the scanline data in the source image original format (stored in the Image property. The RasterCodecs object will then convert this data to the appropriate output format if needed, for example, if the user instructed the RasterCodecs object to save the image in a different file format than the original image.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
 
 
public void SaveImageExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_SaveImage.cmp"); 
 
   // Load the source file (make sure to load as 24 bits/pixel) 
   RasterImage image = codecs.Load(srcFileName, 24, CodecsLoadByteOrder.Bgr, 1, 1); 
 
   // Instruct RasterCodecs to generate the saved scanlines data for us to manipulate 
   codecs.Options.Save.RetrieveDataFromImage = true; 
 
   // Add a handler to the SaveImage event 
   codecs.SaveImage += new EventHandler<CodecsSaveImageEventArgs>(codecs_SaveImage); 
 
   // Save the image 
   codecs.Save(image, destFileName, RasterImageFormat.Cmp, 24); 
 
   codecs.SaveImage -= new EventHandler<CodecsSaveImageEventArgs>(codecs_SaveImage); 
 
   image.Dispose(); 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
private void codecs_SaveImage(object sender, CodecsSaveImageEventArgs e) 
{ 
   // This example works with images saved as 24-bit per pixel only 
   Debug.Assert(e.Image.BitsPerPixel == 24); 
   e.Cancel = false; 
 
   if (e.Row == 0) 
   { 
      // Show information about the image being saved 
      Debug.WriteLine("Saving an image with {0} bpp to {1}", e.Image.BitsPerPixel, e.FileName); 
      Debug.WriteLine("Offset: {0}, OffsetValid: {1}", e.Offset, e.OffsetValid); 
      Debug.WriteLine("Page: {0} of {1}", e.Page, e.LastPage - e.FirstPage + 1); 
      Debug.WriteLine("Page percent: {0}%, Total percent: {1}%, Image Page: {2}", e.PagePercent, e.TotalPercent, e.ImagePage); 
 
      if (e.Stream != null) 
      { 
         Debug.WriteLine("Stream: {0}", e.Stream); 
      } 
   } 
 
   Debug.WriteLine("Row: {0}, Lines {1}", e.Row, e.Lines); 
 
   // Get the scanlines from the image 
   int scanlineLength = e.Image.BytesPerLine; 
   byte[] scanline = new byte[scanlineLength]; 
 
   // Loop through all the scanlines in the data 
   for (int y = 0; y < e.Lines; y++) 
   { 
      // Get this row 
      e.Buffer.GetData(y * scanlineLength, scanline, 0, scanlineLength); 
 
      // We got the data, now double the intensity 
      // Remember, this is 24-bits/pixel 
      for (int x = 0; x < scanlineLength; x++) 
      { 
         scanline[x] *= 2; 
      } 
 
      // Copy it back to the event buffer 
      e.Buffer.SetData(y * scanlineLength, scanline, 0, scanlineLength); 
   } 
} 
 
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.*; 
 
 
public void saveImageExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "Image1.cmp"); 
   String destFileName = combine(LEAD_VARS_IMAGES_DIR, "Image2.cmp"); 
 
   // Load the source file (make sure to load as 24 bits/pixel) 
   RasterImage image = codecs.load(srcFileName, 24, CodecsLoadByteOrder.BGR, 1, 1); 
 
   // Instruct RasterCodecs to generate the saved scanlines data for us to 
   // manipulate 
   codecs.getOptions().getSave().setRetrieveDataFromImage(true); 
 
   // Add a handler to the SaveImage event 
   codecs.addSaveImageListener(codecsSaveImage); 
   // Save the image 
   codecs.save(image, destFileName, RasterImageFormat.CMP, 24); 
 
   assertTrue("File unsuccessfully saved to" + destFileName, (new File(destFileName)).exists()); 
   System.out.println("File is saved to" + destFileName); 
 
   // Clean up 
   codecs.removeSaveImageListener(codecsSaveImage); 
   image.dispose(); 
   codecs.dispose(); 
} 
 
CodecsSaveImageListener codecsSaveImage = new CodecsSaveImageListener() { 
 
   @Override 
   public void onSaveImage(CodecsSaveImageEvent e) { 
      // This example works with images saved as 24-bit per pixel only 
      assertTrue(e.getImage().getBitsPerPixel() == 24); 
      e.setCancel(false); 
 
      if (e.getRow() == 0) { 
         // Show information about the image being saved 
         System.out.println("Saving an image with " + e.getImage().getBitsPerPixel() + " bpp"); 
         System.out.println("Page: " + e.getPage() + " of " + (e.getLastPage() - e.getFirstPage() + 1)); 
         System.out.println("Page percent: " + e.getPagePercent() + "%, Total percent: " + e.getTotalPercent() 
               + "%, Image Page: " + e.getImagePage()); 
 
         if (e.getStream() != null) { 
            System.out.println("Stream: " + e.getStream()); 
         } 
 
      } 
 
      System.out.println("Row: " + e.getRow() + ", Lines " + e.getLines()); 
 
      // Get the scanlines from the image 
      int scanlineLength = e.getImage().getBytesPerLine(); 
      byte[] scanline = new byte[scanlineLength]; 
 
      // Loop through all the scanlines in the data 
      for (int y = 0; y < e.getLines(); y++) { 
         // Get this row 
         e.getBuffer().getData(y * scanlineLength, scanline, 0, scanlineLength); 
 
         // We got the data, now double the intensity 
         // Remember, this is 24-bits/pixel 
         for (int x = 0; x < scanlineLength; x++) { 
            scanline[x] *= 2; 
         } 
 
         // Copy it back to the event buffer 
         e.getBuffer().setData(y * scanlineLength, scanline, 0, scanlineLength); 
      } 
   } 
 
};

Requirements

Target Platforms

Reference

CodecsSaveImageEventArgs Class

CodecsSaveImageEventArgs Members

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Help Version 23.0.2024.2.29

Leadtools.Codecs Assembly

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