public bool RetrieveDataFromImage { get; set; }
@property (nonatomic, assign) BOOL retrieveDataFromImage;
public boolean getRetrieveDataFromImage()
public void setRetrieveDataFromImage(boolean value)
RetrieveDataFromImage # get and set (CodecsSaveOptions)
Value | Description |
---|---|
true | To automatically populate the scanline buffers in CodecsSaveImageEventArgs when using the RasterCodecs.SaveImage event. |
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;
using Leadtools.ImageProcessing.Core;
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:\LEADTOOLS22\Resources\Images";
}
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