Gets or sets a value that indicates whether to automatically populate the scanline buffers in CodecsSaveImageEventArgs when using the RasterCodecs.SaveImage event.
public bool RetrieveDataFromImage { get; set; }
Public Property RetrieveDataFromImage As Boolean
@property (nonatomic, assign) BOOL retrieveDataFromImage
public boolean getRetrieveDataFromImage()
public void setRetrieveDataFromImage(boolean value)
true to automatically populate the scanline buffers in CodecsSaveImageEventArgs when using the RasterCodecs.SaveImage event, or false to make the user responsible for populating the scanline buffers. Default value is false.
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.
The following example shows how to use RetrieveDataFromImage to:
using Leadtools;
using Leadtools.Codecs;
private int myMode;
public void RetrieveDataFromImageExample()
{
using (RasterCodecs codecs = new RasterCodecs())
{
string srcFile = Path.Combine(LEAD_VARS.ImagesDir, "Sample1.cmp");
string blankFile = Path.Combine(LEAD_VARS.ImagesDir, "Sample1_Blank.bmp");
string defaultFile = Path.Combine(LEAD_VARS.ImagesDir, "Sample1_Default.bmp");
string invertedFile = Path.Combine(LEAD_VARS.ImagesDir, "Sample1_Inverted.bmp");
// Load the source image
using (RasterImage image = codecs.Load(srcFile))
{
// Subscribe to the SaveImage event
codecs.SaveImage += new EventHandler<CodecsSaveImageEventArgs>(codecs_SaveImage);
// First, set RetrieveDataFromImage to false and save
// This should generate a blank image
myMode = 0;
codecs.Options.Save.RetrieveDataFromImage = false;
codecs.Save(image, blankFile, RasterImageFormat.Bmp, 24);
// Next, set RetrieveDataFromImage to true but do not
// change the data, this should generate the correct image and is the equivalant
// to calling Save without subscribing to SaveImage
myMode = 1;
codecs.Options.Save.RetrieveDataFromImage = true;
codecs.Save(image, defaultFile, RasterImageFormat.Bmp, 24);
// Finally, leave RetrieveDataFromImage as true but change the data by inverting
// the scanlines, this should generate an inverted image
myMode = 2;
codecs.Save(image, invertedFile, RasterImageFormat.Bmp, 24);
codecs.SaveImage -= new EventHandler<CodecsSaveImageEventArgs>(codecs_SaveImage);
}
}
}
private void codecs_SaveImage(object sender, CodecsSaveImageEventArgs e)
{
// This example works with 24 bpp images only
Debug.Assert(e.Image.BitsPerPixel == 24);
switch (myMode)
{
case 0:
// Do not do anything
break;
case 1:
// Do not do anything
break;
case 2:
// Invert the image data
{
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);
// Process it by inverting every pixel data
for (int x = 0; x < scanlineLength; x++)
{
scanline[x] = (byte)(255 - scanline[x]);
}
// Copy it back to the event buffer
e.Buffer.SetData(y * scanlineLength, scanline, 0, scanlineLength);
}
}
break;
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Private myMode As Integer
Public Sub RetrieveDataFromImageExample()
Using codecs As New RasterCodecs()
Dim srcFile As String = Path.Combine(LEAD_VARS.ImagesDir, "Sample1.cmp")
Dim blankFile As String = Path.Combine(LEAD_VARS.ImagesDir, "Sample1_Blank.bmp")
Dim defaultFile As String = Path.Combine(LEAD_VARS.ImagesDir, "Sample1_Default.bmp")
Dim invertedFile As String = Path.Combine(LEAD_VARS.ImagesDir, "Sample1_Inverted.bmp")
' Load the source image
Using image As RasterImage = codecs.Load(srcFile)
' Subscribe to the SaveImage event
AddHandler codecs.SaveImage, AddressOf codecs_SaveImage
' First, set RetrieveDataFromImage to false and save
' This should generate a blank image
myMode = 0
codecs.Options.Save.RetrieveDataFromImage = False
codecs.Save(image, blankFile, RasterImageFormat.Bmp, 24)
' Next, set RetrieveDataFromImage to true but do not
' change the data, this should generate the correct image and is the equivalant
' to calling Save without subscribing to SaveImage
myMode = 1
codecs.Options.Save.RetrieveDataFromImage = True
codecs.Save(image, defaultFile, RasterImageFormat.Bmp, 24)
' Finally, leave RetrieveDataFromImage as true but change the data by inverting
' the scanlines, this should generate an inverted image
myMode = 2
codecs.Save(image, invertedFile, RasterImageFormat.Bmp, 24)
RemoveHandler codecs.SaveImage, AddressOf codecs_SaveImage
End Using
End Using
End Sub
Private Sub codecs_SaveImage(ByVal sender As Object, ByVal e As CodecsSaveImageEventArgs)
' This example works with 24 bpp images only
Debug.Assert(e.Image.BitsPerPixel = 24)
Select Case myMode
Case 0
' Do not do anything
Case 1
' Do not do anything
Case 2
' Invert the image data
Dim scanlineLength As Integer = e.Image.BytesPerLine
Dim scanline(scanlineLength - 1) As Byte
' Loop through all the scanlines in the data
For y As Integer = 0 To e.Lines - 1
' Get this row
e.Buffer.GetData(y * scanlineLength, scanline, 0, scanlineLength)
' Process it by inverting every pixel data
For x As Integer = 0 To scanlineLength - 1
scanline(x) = CByte(255 - scanline(x))
Next
' Copy it back to the event buffer
e.Buffer.SetData(y * scanlineLength, scanline, 0, scanlineLength)
Next
End Select
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
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