SaveImage Event

Summary

Occurs during the file save process to provide functionality for manually handling the output image data or monitoring a progress status.

Syntax

C++/CLI

Java

Python

public event EventHandler<CodecsSaveImageEventArgs> SaveImage

synchronized public void addSaveImageListener(CodecsSaveImageListener listener) 
synchronized public void removeSaveImageListener(CodecsSaveImageListener listener)

public: 
event EventHandler<CodecsSaveImageEventArgs^>^ SaveImage

def SaveImage(sender,e): # sender: RasterCodecs e: CodecsSaveImageEventArgs

Event Data

The event handler receives an argument of type CodecsSaveImageEventArgs containing data related to this event. The following CodecsSaveImageEventArgs properties provide information specific to this event.

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

Remarks

This event will fire during saving images with the Save methods. If you use this event, you must copy the image data to the provided event buffer.

You can also use this event to get information about the image being saved, provide a progress status, and/or abort the save operation. For information on how to use this event as a progress status monitor, refer to CodecsSaveOptions.RetrieveDataFromImage and CodecsSaveImageEventArgs.

Example

This example will double the density of an image as it is being saved.

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

RasterCodecs Class

RasterCodecs Members

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Help Version 23.0.2024.2.29

Leadtools.Codecs Assembly

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